a stone crusher specially used for crushing gravel or sand stone

Gravel is rock that is any loose rock that is larger than 2 mm (0.079 in) in its smallest dimension (about 1/12 of an inch) and no more than 64 mm (2.5 in).

Gravel crusher mainly for manufacturing construction material such as sand and stone. Our company has been engaged in research and development gravel crusher 20 years of experience, the constant introduction of new gravel crusher, to meet different customer needs. Our gravel crusher are jaw gravel crusher, cone gravel, mobile gravel crusher, impact gravel crusher, and other widely used in various ores, concrete, construction waste, slag processing and other industries. We also produce gravel crusher of supporting products, such as belt conveyor, vibrating screen, vibrating feeder and sand washing machine. And supporting the use of these devices will lead to more efficient!

SBM gravel crushers such as jaw gravel crusher, cone gravel crusher, impact gravel crusher, mobile gravel crusher and so on are applied widely in various ores, cement, refractory, aluminum where soil clinker, emery, glass raw materials, mechanism building sand, stone and all kinds of metallurgical slag and other industries.
Gravel crusher also can crush concrete, kerbstone, marble, paving slabs, bricks, tiles, blocks, stone, porcelain, flint, gravestones, etc. Our customer base includes quarries, sand and gravel pits, recycling operations, construction contractors, heavy-highway builders, local, county and state municipalities and utilities.

Shibang is a famous manufacturer of rock gravel crusher in China, andsupply all kinds of stone crushers, grinding machine and other miningequipments for sale. Now, our gravel crusher has been exported to manycountries, such as USA, Egypt, South Africa, Mongolia, Russia, Germany, Malaysia, Pakistan, India, Iran etc.We not only supply gravel crusher, but also a series of installation and maintenance service.

And the crushing and grinding mill production line we company have produced can solve various stonecrushing and grinding lines. And the equipment configure of theproduction line depend on the stone materials specification andapplication customer require.

• Gravel Production Line

  Gravel production line is a stone dedicated production line of sand and gravel in buildings, roads, railways and other industries. Gravel production line includes gravel crusher, jaw crusher, impact crusher, impact crusher, vibrating feeder, vibrating screen, sand washing machine, and belt conveyor and so on. SBM gravel production line has reliable performance, reasonable design, convenient operation, high efficiency work. So gravel production line or gravel crusher plant is the ideal production equipment in sand making process, bedding material crushing, asphalt concrete and cement concrete aggregate processing.

• Gravel Production Line Features

  1. Our gravel production line is suitable for artificial sand making or processing hard limestone, granite, basalt, cobble and other aggregates.
  2. It is applicable to power industry, building materials processing, road building, and construction industry and other fields.
  3. Gravel production line output is generally 50-500 t/h.
  4. The gravel production line can be fitted with dust removal plant to meet your different processing requirements.

coal crushing plant applied for coal processing

Coal Classification
Coal can be classified into subbituminous coal, lignite, anthracite, and bituminous coal. Of the four kinds of coal, anthracite is the hardest and has the highest carbon content.

Coal Crusher Applied for Coal Processing
The whole process to deal with coal is as follows: The raw coal is first sent to a belt conveyor to a preparation plant located at the mining site. The plant is responsible for removing some unwanted materials such as dirt, rock, ash, and sulphur in order to increase the coal's heat value. Some coal processing equipment is indispensable in this process.

Coal crusher can resize the coal stones so that they can be easily processed. In general, the coal's Mohs hardness is below 5. The miners usually use jaw crusher, impact crusher and hammer crusher to handle it. After the crushing process, the coal will be conveyed via belt conveyor to the vibrating screen so as to sieve out the coal by size. In addition, in order to remove water from the products, dewatering screen is necessary.

Shibang Machinery has over 50 years of manufacturing experience in coal crushing plant. As a major coal crusher supplier, we provide equipment for power plants and coke ovens, crush limestone for blast furnaces, and crush a variety of materials for industrial uses. Besides, as one of the largest exporter of coal crushers and some related spare parts, Jinjin Mining Machinery has designed and developed various crushers, which are widely applied for material crushing and processing in more than 100 countries around the world.

In order to satisfy customers' needs, the coal must be crushed into suitable sizes. According to the particle size, the crushing process can be divided into coarse grain (the crushing to 50mm and above), medium grain (crushed into 25-6mm), fine grain (crushed into 6-1mm), and superfine grain(1mm or less). In order to fit in with different crushing processes, primary coal crusher, secondary coal crusher and tertiary coal crusher are needed.

Coal Crusher Applied for Power Station Boiler
Power station boiler mainly provides steam to the turbine generator in thermal power plant. Fuel is burned in the boiler and releases heat energy, and heat transfers through the metal wall of the boiler water into a certain pressure and temperature of superheated steam, then steam into the turbine, the generators driven by the turbine. The world total thermal power generation capacity is about 70%, and in China the capacity reaches up to 80%. Thus, the boiler plays a significant role in reducing energy consumption and boosting the development of national economy. Most of station boilers use coal as the main fuel, so coal crusher now becomes the most commonly used crushing equipment to crush coal in thermal power plant. Jinjin coal crusher has been widely applied in the station boiler system owing to its unique advantages.

With more than 50 years' professional manufacturing experience, shibang Machinery has now taken the leading position in mining machinery industry. Moreover, we are always ready to meet new challenges. We are committed to providing quality products with low operation costs for customers.

quartz crusher for gold mining

Primary gold typically occurs in quartz veins. The extraction of gold ore from these hard quartz veins was historically referred to as quartz reef mining.
A Prussian engineer, Jacob Brache was the first to think that quartz reefs might have even more gold than alluvial fields.
The new mining companies had to sink very deep shafts to get quartz from the reefs deep underground. Horizontal tunnels called drives were dug out from the shaft at different levels to find the gold-bearing rock.
All rock dug out had to be hoisted to the surface. So did lots of water and even the workers at the end of the day. Big engines were installed to hoist lifts and buckets up the shafts.
On the surface above the shaft stands a building known as the poppet head or pit head. The poppet head contained a wheel called a gin wheel which lifted buckets of rock up to a raised platform called a Brace. Wheeled buckets then carried the rock along elevated tracks to waste dumps or processing works. The steel cable that hoisted the bucket passed over the gin wheel.

Quartz is the second most abundant mineral in the Earth's continental crust, after feldspar. It is made up of a continuous framework of SiO₄ silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO₂.

There are many different varieties of quartz, several of which are semi-precious gemstones. Especially in Europe and the Middle East, varieties of quartz have been since antiquity the most commonly used minerals in the making of jewelry and hardstone carvings.

The gold was brought to the surface as small particles embedded in lumps of quartz. The quartz was then crushed into a fine dust by stamping batteries in a stamping mill. A stamping battery contained a row of stampers. On the bottom of each stamper was a heavy piece of steel. Each stamper was connected to the cam shaft which was turned by a water wheel. The steel shoes went up and down between wooden guides and pounded the quartz which had been fed into steel boxes underneath the stampers. Ideally the stamping batteries would work 24 hours a day.
After crushing, the quartz dust was mixed with water to make sloppy mud which then ran down sloping tables, called concentrating tables. On top of these tables were copper sheets coated with mercury, which attracts gold. The gold particles stuck to the mercury, and could be collected from there.

Crushing and grinding process is essential process in quartz sand, glass and ceramics production line. crushers

In crushing process, we use jaw crusher, impact crusher, cone crusher, vsi crusher and mobile crusher as quartz stone crusher machine. These crushers and belt conveyor, vibrating screen, vibrating feeder form a complete quartz crushing plant. Of course, glass crusher and ceramics crusher have differences. Natural Marbles are crushed into smaller ones in crushing process.

Crushed quartzs are grinded into powder in grinding process using quartz grinding mill. Ball mill, vertical mill,ultrafine mill is usually used in this process. These quartz grinding machines can form a complete grinding process. The finished size can upto 2500 mesh.

Opening up new open cuts

While many predicted the threat of a heavy mining tax would stop, or at the very least slow the resources industry, clearly some were not listening.

Expanding its already massive coal arm, Rio Tinto has officially opened Australia’s newest open cut thermal coal mine at Clermont.

Construction on the mine and associated infrastructure started back in 2007, with the first shipment of coal delivered in May this year.

Holding a 190 million tonnes of coal, the mine has an expected life span of 17 years with production expected to peak at more than 12 million tonnes per year of export coal and 100 thousand tonnes for domestic use when the mine reaches capacity in 2013.

Rio’s global chief executive energy Doug Ritchie told the hundreds gathered at the opening of the mine that it was special for many reasons.

“It has five coal seams that are particularly thick, the Wolfgang seam is 35 metres thick on average and up to 100 metres in some places.”

With the seams located under a large volume of overburden, Rio built it’s only inpit crusher/conveyor system on site.

“This will reduce annual truck running costs by more than 35%,” Ritchie said.

While the majority of the mine’s coal can be crushed and sold directly for export markets such as Korea, Japan and Thailand, it also has a small coal processing plant that uses paste thickening technology.

Using this technology eliminated the need for a conventional tailings dam on site.

Now that the mine has officially opened, Clermont is aiming to continue to play a strong part in the local community’s future.

In 2009 alone, Clermont contributed more than $610 000 to community projects.

It is looking to replace the role of the neighbouring Rio Tinto Blair Athol Mine, where closure is currently planned for 2016.

The Blair Athol mine has been central to the region over the past 25 years and Clermont Mine will extend this into the future, Ritchie said.

Clermont will also send its processed coal along a newly constructed 13 kilometre conveyor to the older mine, using the existing equipment at Blair Athol for stockpiling and railing to port.

More than 10 000 applications were received during the mine’s recruitment drive, with people such as Clermont local Brad Perrin and Rebecca Chilcott finding jobs at the site.

Having worked at both Blair Athol and Clermont as well as growing up nearby, Brad Perrin had a unique perspective.

“Rio Tinto has built a good relationship with its near neighbours and done their utmost to minimise the impact on the area,” Perrin said.

Some of this minimisation includes the protection of endangered plant species found near the site.

The mine has entered into an agreement where it will sponsor University of Queensland research into one of Australia’s rarest plants, the Belyando Cobblers Peg, and how to best re-establish it.

It is also part of long running research into wild koala populations in the region.

Rebecca Chilcott found her new job, driving haul trucks and water carts daunting at first but says she has really enjoyed the challenge.

During construction, the mine won an Australian Mining Prospect Award for its proactive approach to hiring women.

Currently women make up 27% of the site’s workforce, well above the QLD state average of 11%.
The mine aims to have a total of 380 people employed when fully operational.

SBM supply you any type mining equipment for cement,coal, salg,calcite,concrete,copper ore,manganese ore,gold minng equipment,chromium,gravel,feldspar,quartz, etc.

If you are looking for mining equipment for your busienss,Visit:  http://www.rockscrusher.com

List Of Mining Machines:

quartz crusher coal crusher calcite crusher cement crusher concrete crusher manganese crusher gold mining equipment chromium crusher gravel crusher cement mill jaw crusher symons cone crusher

Five questions — and answers — about Facebook Groups

Another week, another Facebook controversy — this time, over the site’s just-relaunched "Groups" feature, which lets you create instant private or public spaces for your friends, co-workers, fellow hobbyists, you name it.

Personally, I think the idea behind the new Groups feature is an excellent one. By designating smaller circles of friends within your overall list of Facebook pals (which, for some online social butterflies, can easily run into the thousands), you can post updates, photos, videos, and URLs to your individual subsets without bothering everyone on Facebook with the minutiae of, say, your breakfast menu, or how quickly you crossed the finish line in your latest half-marathon.
Indeed, I might start actually posting to Facebook again now that I’ve created a tiny group of friends (three, to be exact) who (a) I trust, and (b) won’t be annoyed by any pointless musings that I'll be tacking onto our wall. (Uh, guys — you don’t mind, right?)
But it didn’t take long for a controversy to flare up: namely, the fact that your Facebook friends can add you to any group they so choose — as long as they’re already members of said group — without your permission.
Why did Facebook make Groups go the "opt-out" rather than "opt-in" way? "To make the product simple" is the official line. Another likely reason for the policy, I’m guesssing, is that it encourages the rapid growth of ... well, new groups. Without the necessity of waiting for invitees to accept an invite, Facebook’s groups are free to grow quickly and exponentially. The more — and bigger — groups there are, the more Facebook memberswill use them — and that’ll make groups more attractive to app developers and advertisers. Hey, that’s business, like it or not.
Of course, the downside is that you might find yourself suddenly signed up into a Facebook group (or groups) you hadn’t bargained for, such as the "Underwater Basket-weavers of America," with your inbox suddenly flooded with email notifications for each and every snapshot, comment, and update posted to the collective group wall.
That’s a side-effect I’d count as more of an annoyance than anything else, although there’s always the more worrisome possibility that one of your frenemies will add you to a group of a more, ah, unsavory nature.
So, here are five questions — and answers — for how to weather the current Facebook Groups storm (or tempest in a teapot, depending on how you look at it).
1. Who can add me to a Facebook group?
Not just anyone can add you to a group — in fact, only someone who’s already one of your Facebook friends can do so. Still, it’s a bit disturbing that any of your Facebook friends can add you to, say, the "Bald Eagle Hunters Club" without getting your permission.
Then again, your friend would already have to be a "BEHC" member before he or she could invite you to the group ... and besides, who is this so-called friend, anyway? Indeed, the story that sparked this whole debate about the Groups feature involves someone with more than 4,000 Facebook friends. I don’t think I’ve even met 4,000 people in my 41 years on Planet Earth, much less know 4,000 people whom I’d be willing to "friend" on Facebook.
Suggestion: If you’re seriously worried about people adding you to groups that you’d rather not be a member of, maybe it’s time to pare down your Facebook friends list, starting with anyone who added you to a group you didn’t want to be a member of. The "Remove from Friends" button can be, in fact, your friend.

[Related: Facebook CEO falls victim to 'Groups' prank]

2. How do I leave a group — and prevent someone from adding me again?
Wait — so, you didn’t want to be a member of the "Underwater Basket-weavers of America"? Just visit the group page, click on the "Leave Group" link under the list of members, and you’re outta there — simple. After that, no one will be able to re-add you to the group in question without your explicit permission.
3. But even if I remove myself from a group, won’t the fact that I got added in the first place pop up in my Facebook news feed, for all to see?
Yep, you’re right. You can always delete the notification from your wall, but that won’t stop your Facebook friends or other users (depending on your privacy settings) from seeing the update before you were able to delete it.
One proactive (if extreme) measure, is to deny the Groups app permission to publish stories to your wall; just click on Account on the top-right of the Facebook interface, then select Application Settings. Find the Groups app, click Edit Settings, then click the "Additional Permissions" tab (almost there), and, finally, uncheck the box that reads "publish content to my wall."
4. How do I cut down on all these email notifications from my groups?
Getting inundated with a flood of email messages every time someone posts a "Cute photo!" comment onto a group snapshot can quickly grow tiresome. If you’d like to keep your inbox as uncluttered as possible, just tweak your Groups notification settings: Visit the specific group page, click the "Edit Settings button" in the upper-left-hand corner of the page, and select the radio button next to the option you prefer (for example, you can get a notification each and every time a member posts or comments, only when a friend posts, or only when someone comments on one of your posts). You can also visit the email notification page in your privacy settings and turn off all notifications if you wish.
5. Can the other members in my new group see all my Facebook info?
So, the worst has happened: Your now ex-friend just added you to the "Bald Eagle Hunters Club," and all of a sudden you’re unwillingly mingling with a bunch of ... well, people you wouldn’t normally invite over for tea. Since you’re in a group with these guys, do they now have access to all your Facebook info?
Here’s the good news: not if you’ve limited access to your profile in Facebook’s privacy settings. If you’ve restricted your updates, photos, and personal data to "friends only," your fellow "Bald Eagle" members won’t be able to see anything about you except your publicly accessible profile info (which, again, you can customize in your privacy settings).
On the other hand, if your privacy settings allow anyone and everyone to see your Facebook info, other, non-friend members in your new Group will be able see your data too — then again, they already could, even before you (unwittingly or not) joined the group.
Bonus: What can I do to ensure my privacy is completely secure in a group — or on Facebook in general?
You probably already know all this, but it bears repeating in light of the new Groups controversy: Facebook isn’t about keeping your personal info safe. It’s a (for-profit) business that does everything it can to get people to share their personal information. That’s not an excuse, it’s just a fact.
If you’re really worried about your privacy on Facebook, please — don’t post your personal details, photos, videos, street addresses, or phone numbers on Facebook. Seriously! It might even be time to delete your account, or just don’t join at all. Trust me, you’ll still be able to make friends in the real world.
But if you still want to be on Facebook, you’ll have to accept the fact that you’re putting your personal information in Facebook’s hands. Don’t trust Facebook — or your friends on Facebook, for that matter? Then maybe Facebook isn’t for you.
— Ben Patterson is a technology writer for Yahoo! News.

jaw crusher

verticla roller mill

Vertical roller mill has many different forms, but it works basically the same. All of these forms of machine comes with roller (or the equivalent of roller grinding parts), and roller along the track of the disc at the level of circular movement imposed by external grinding roller in the vertical pressure on the disc on the material being the joint action of compression and shear, and to crush.
Material grinding process: motor through reducer rotating drive disc, the material falls from the mill under the central entrance and exit, under the action of centrifugal force to the disc edge by the roller to move and the crushing, grinding out lap after the material was speed up the flow to and vertical mill with one of the separator, after the meal by the separator back to the mill, the re-grinding; powder while grinding out with air, dust collection equipment in the system to collect down, that is, products . Established through the mill in the pneumatic conveying of materials, a larger air flow rate, which can use waste heat of gas, at the same time dry grinding operations.

Vertical Roller Mill Principle:
Used in cement grinding production grinding parts of its various forms, there is a cylinder, cone type, ball type, etc., and roller surface is also flat, curved, convex round noodles. Applied to the grinding roller to roller grinding along the track bed in close contact with the material strength of a spring pressure, hydraulic, etc..

How Vertical Roller Mill Works:
It has two pairs of grinding rollers, each pair of roller composed of two narrow rollers, mounted on the same axis and can rotate at different speeds. There are two circular disc slot, and roller to the tire shape, work pressure in the tank. Disc roller and the relative sliding velocity between small and roller can swing, even if the roller sleeve and the disc after the liner wear can guarantee a good abrasive, will not affect the grinding effect. Roller symmetrical structure, one side can be upside down after use and wear.
Material grinding process: hydraulic pneumatic roller device through the pressure applied to the material on the crushing of materials, the materials have been moved to crush the edge of disc, from the disc around the nozzle from the exhaust air to improve these materials to Separator.Meal to separate returns after a concentrated mill, fine powder was collected in the precipitator unloading. In the gas flow is small, the meal can not be increased to enhance air flow, they would fall through the nozzle discharged outside the mill, bucket elevator to be transported to the feeder of vertical roller mill, and was re-grinding mill feed people. This cycle features of the way there:
① ring by adjusting the air valve, can change the product fineness can Shide mill bed load material uniformity and stability, improving the grinding efficiency;
② coarse particles in the external circulation, helps reduce Fan power consumption and overall system power

verticla roller mill

Vertical roller mill has many different forms, but it works basically the same. All of these forms of machine comes with roller (or the equivalent of roller grinding parts), and roller along the track of the disc at the level of circular movement imposed by external grinding roller in the vertical pressure on the disc on the material being the joint action of compression and shear, and to crush.
Material grinding process: motor through reducer rotating drive disc, the material falls from the mill under the central entrance and exit, under the action of centrifugal force to the disc edge by the roller to move and the crushing, grinding out lap after the material was speed up the flow to and vertical mill with one of the separator, after the meal by the separator back to the mill, the re-grinding; powder while grinding out with air, dust collection equipment in the system to collect down, that is, products . Established through the mill in the pneumatic conveying of materials, a larger air flow rate, which can use waste heat of gas, at the same time dry grinding operations.

Vertical Roller Mill Principle:
Used in cement grinding production grinding parts of its various forms, there is a cylinder, cone type, ball type, etc., and roller surface is also flat, curved, convex round noodles. Applied to the grinding roller to roller grinding along the track bed in close contact with the material strength of a spring pressure, hydraulic, etc..

How Vertical Roller Mill Works:
It has two pairs of grinding rollers, each pair of roller composed of two narrow rollers, mounted on the same axis and can rotate at different speeds. There are two circular disc slot, and roller to the tire shape, work pressure in the tank. Disc roller and the relative sliding velocity between small and roller can swing, even if the roller sleeve and the disc after the liner wear can guarantee a good abrasive, will not affect the grinding effect. Roller symmetrical structure, one side can be upside down after use and wear.
Material grinding process: hydraulic pneumatic roller device through the pressure applied to the material on the crushing of materials, the materials have been moved to crush the edge of disc, from the disc around the nozzle from the exhaust air to improve these materials to Separator.Meal to separate returns after a concentrated mill, fine powder was collected in the precipitator unloading. In the gas flow is small, the meal can not be increased to enhance air flow, they would fall through the nozzle discharged outside the mill, bucket elevator to be transported to the feeder of vertical roller mill, and was re-grinding mill feed people. This cycle features of the way there:
① ring by adjusting the air valve, can change the product fineness can Shide mill bed load material uniformity and stability, improving the grinding efficiency;
② coarse particles in the external circulation, helps reduce Fan power consumption and overall system power