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Thursday, 11-Jul-2013 08:15 Email | Share | | Bookmark
How to Decide the Quantity of Grinding Media

For the most efficient results, the Mill should be at least half filled with grinding media. Some operators prefer to go a little beyond the halfway mark to compensate for wear. There is no objection to this and we have been suggesting a limit of about 5 percent.
In steel ball grinding, many operators, especially in the paint industry, are satisfied to run with a smaller ball charge ranging as low as one-third the volume of the Mill. They find the smaller charge gives them the required grind within allowable limits of grinding time and the extra space gives them more loading room.
There is no objection to this practice when the grinding cycle falls within the desired working limits. Where speed of grind is of utmost importance, larger ball charges ranging up to the recommended 50% for other types of grinding media are advisable. The logic in this system is best illustrated as follows:
5/8” steel balls are one of the most popular sizes, and there are 36 of these per pound. In a 54” x 60” Steel Ball Mill, for example, the difference between the weight of a one-third and one-half ball charge is 3,970 pounds, or 103,220 balls. The ?” steel ball is another very popular size and, as there 53 of these per pound, the difference would amount to 200,410 balls. It s therefore, reasonable to expect (and experience has proven this to be true) that any addition above the minimum limits prescribed can only result in increased grinding efficiency. This improvement is usually related to the surface area of the media involved.
It is not true that a one-half ball charge consumes proportionately more power than a one-third ball charge. The difference in weight between the tow charges is about 50% but the center of gravity of the larger is nearer the center of rotation of the Mill. Consequently, the power required to turn the larger charge only runs between 15 and 20% more.
The grinding efficiency of the one-half charge is considerably greater than for the one-third and, therefore it ca be expected that power consumption per gallon output will actually be less than with the smaller charge.
Grinding media should be periodically checked. Reduction in the quantity and size of the grinding media will result in poor grinding. We suggest a maximum schedule of once every six months, but any established procedure should be decided by individual experience. In some cases, where abrasive materials are involved, once a month is not too often and, in a few cases, even shorter intervals are indicated.
A simple method for checking is to have a rod cut indication the distance from the top of the grinding media to the underside of the manhole opening and use this for checking the depth of the charge.
When grinding enamel frit, wear to the porcelain balls is quite excessive because to the abrasive nature of the frit. Consequently, many operators have been able to closely determine the ball wear per batch and, when a batch of frit is loaded for grinding, a quantity of new balls is added equaling the weight lost during the previous grind. However, even with this system, we still advise an occasional check with the measuring rod because there is no positive guarantee that all balls will wear the same.
We also advocate dumping the charge once a year, or as often as experience indicates, and removing any grinding media found to be excessively worn or damaged. Get Ceramic Ball Mill,Ball Mill,Beneficiation From http://www.ceramic-ball-mill.com


Wednesday, 10-Jul-2013 08:11 Email | Share | | Bookmark
Is Magnetic Separation a Little Used Process in Mineral Industry

Actually, in some mineral applications, the flotation step is being replaced with Magnetic Separation because of its low capital cost (by comparison) and the reduced operating costs of cutting out reagents and low power requirements. Also, in a day where environmental concerns greatly affect business decisions, not using reagents is a welcome choice.
Still, the processing decision is dictated by the nature of the deposit and the know how of the flowsheet developer. Magnetic susceptibility is, unfortunately, not the only element to dictate the most appropriate process - hence why there are so many means for processing and no two processing plants are alike.
There is no simple answer, but Watson is correct when he states that Magnetic Separators are widely used in processing minerals ?and you are correct in your interpretation of why they are a good choice.
Zoneding Machine did a good job of covering this issue by looking at glass sand processing. Get Ceramic Ball Mill,Ball Mill,Beneficiation From http://www.flotation-machines.com


Tuesday, 9-Jul-2013 08:11 Email | Share | | Bookmark
What is Stone Crusher Used for

Crusher machine is widely used in mineral ore mining, metallurgical, construction buiding, chemistry, petrochemicals, transporta- tion, energy industry, suitable for crushing high hard, mid hard and soft rocks and ores such as iron ore, limestone, slag, marble, quartz, granite, cement, clinker, coal and so on. Crusher machine features large crushing rate, high yield, equal product size, simple structure, reliable operation and easy maintenance, economic operating costs etc. Our Stone Crusher contains Jaw Crusher, Impact Crusher, Cone Crusher, VSI crusher, mobile crusher, Hammer Crusher etc. Crusher machine is mainly used in Sand Making Production Line and stone crushing production line. In the process flow of sand making production line, Vibrating Feeder is the first used mining equipment to supply raw material to stone crusher machine. The primary stone crusher is jaw crusher or jc jaw crusher whose aim is to make big stone smaller. The secondary stone crusher is vsi crusher. vsi stone crusher is the best machine to make fine sand, the products have to go through Sand Washer to wash out mud. The finished prosuct is cubic, and of good quality, great strengh to resist compression. With low contents of needle and slice particles, the product is especially suitable for high quality construction such as water conservancy, bridge, highway and high buiding etc.
Zoneding Machine is a professional manufacturer of mining machines, designs all kinds of crushing machine and grinding machine for sale, and has been exported to all over theworld such Germany, USA, Australia, Ghana, Indonesia, Vietnam, South Africa etc. According to the special materials, zoneding machine designs special crushing machines and grinding machines, for example, coal crusher, cement crusher, concrete crusher, gold mining equipment, ore crusher, aggregate crusher, and gravel crusher etc. Get Ceramic Ball Mill,Ball Mill,Beneficiation From http://www.ceramic-ball-mill.com


Tuesday, 9-Jul-2013 08:10 Email | Share | | Bookmark
What is Stone Crusher Used for

Crusher machine is widely used in mineral ore mining, metallurgical, construction buiding, chemistry, petrochemicals, transporta- tion, energy industry, suitable for crushing high hard, mid hard and soft rocks and ores such as iron ore, limestone, slag, marble, quartz, granite, cement, clinker, coal and so on. Crusher machine features large crushing rate, high yield, equal product size, simple structure, reliable operation and easy maintenance, economic operating costs etc. Our Stone Crusher contains Jaw Crusher, Impact Crusher, Cone Crusher, VSI crusher, mobile crusher, Hammer Crusher etc. Crusher machine is mainly used in Sand Making Production Line and stone crushing production line. In the process flow of sand making production line, Vibrating Feeder is the first used mining equipment to supply raw material to stone crusher machine. The primary stone crusher is jaw crusher or jc jaw crusher whose aim is to make big stone smaller. The secondary stone crusher is vsi crusher. vsi stone crusher is the best machine to make fine sand, the products have to go through Sand Washer to wash out mud. The finished prosuct is cubic, and of good quality, great strengh to resist compression. With low contents of needle and slice particles, the product is especially suitable for high quality construction such as water conservancy, bridge, highway and high buiding etc.
Zoneding Machine is a professional manufacturer of mining machines, designs all kinds of crushing machine and grinding machine for sale, and has been exported to all over theworld such Germany, USA, Australia, Ghana, Indonesia, Vietnam, South Africa etc. According to the special materials, zoneding machine designs special crushing machines and grinding machines, for example, coal crusher, cement crusher, concrete crusher, gold mining equipment, ore crusher, aggregate crusher, and gravel crusher etc. Get Ceramic Ball Mill,Ball Mill,Beneficiation From http://www.ceramic-ball-mill.com


Tuesday, 9-Jul-2013 08:08 Email | Share | | Bookmark
What is Stone Crusher Used for

Crusher machine is widely used in mineral ore mining, metallurgical, construction buiding, chemistry, petrochemicals, transporta- tion, energy industry, suitable for crushing high hard, mid hard and soft rocks and ores such as iron ore, limestone, slag, marble, quartz, granite, cement, clinker, coal and so on. Crusher machine features large crushing rate, high yield, equal product size, simple structure, reliable operation and easy maintenance, economic operating costs etc. Our Stone Crusher contains Jaw Crusher, Impact Crusher, Cone Crusher, VSI crusher, mobile crusher, Hammer Crusher etc. Crusher machine is mainly used in Sand Making Production Line and stone crushing production line. In the process flow of sand making production line, Vibrating Feeder is the first used mining equipment to supply raw material to stone crusher machine. The primary stone crusher is jaw crusher or jc jaw crusher whose aim is to make big stone smaller. The secondary stone crusher is vsi crusher. vsi stone crusher is the best machine to make fine sand, the products have to go through Sand Washer to wash out mud. The finished prosuct is cubic, and of good quality, great strengh to resist compression. With low contents of needle and slice particles, the product is especially suitable for high quality construction such as water conservancy, bridge, highway and high buiding etc.
Zoneding Machine is a professional manufacturer of mining machines, designs all kinds of crushing machine and grinding machine for sale, and has been exported to all over theworld such Germany, USA, Australia, Ghana, Indonesia, Vietnam, South Africa etc. According to the special materials, zoneding machine designs special crushing machines and grinding machines, for example, coal crusher, cement crusher, concrete crusher, gold mining equipment, ore crusher, aggregate crusher, and gravel crusher etc. Get Ceramic Ball Mill,Ball Mill,Beneficiation From http://www.ceramic-ball-mill.com


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