Jaw crusher is one of the most commonly used primary crushers in the ore processing plant, with the capacity range of 1 1000tph. There are two types of feeding opening design, rectangular and square shape. The primary jaw crusher is usually designed with a square opening, while the secondary jaw crusher is designed with a rectangular opening.
Tailing recovery: usually will use a gold sluice box to recovery tailings that coming from centrifugal machine. So can get more gold. So can get more gold. Refining : if some customer needs very very high purity gold and need to smelt to the gold bar for sale, they can use a gold smelting furnace to smelt gold dust to a gold bar.
An alternative technique, designed by the Bureau of Mines, uses crushers, screens, and zigzag air classifiers to concentrate mica. Sheet or flake mica has two dimensions many times larger than the third dimension. After screening the ore into close size fractions, the mica sheets or flakes are significantly lighter than the gangue particles of the same size fraction. Air classification separates the flat, light mica particles from the heavier gangue particles. Crushing and grinding of the ore is to the least amount necessary to liberate the mica from the host rock. The process is effective in treating mica bearing ores down to approximately 65 mesh.
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A generalized flow diagram of the Bureaus pneumatic concentration method for mica recovery is shown in figure 1. For this study, three types of laboratory size ore crushers were employed to liberate the mica: a standard jaw crusher, a roll crusher, and a hammer mill. Material too large to be fed to the crushers was broken with a sledge hammer to a usable size. The jaw crusher had jaws measuring 5 inches wide by 8 inches high . Pieces of material up to 5 inches in diameter were crushed in this machine to minus 1 inch diameter for processing in the air classifier. The roll crusher had two smooth rolls measuring 5 inches wide and 8 inches in diameter. Pieces of material up to 4 inches in diameter were fed to the crusher and crushed to minus 1 inch. The hammer mill had a 12 inch diameter rotating drum with free swinging hammers projecting 3 inches from the drum. The maximum feed size was approximately 8 inches. The Bureaus pneumatic concentration method for m...
Industry has not established a standard method of analysis to determine the mica content of a sample. In this study, three methods were used individually and in combination to determine the mica content of the various products. These methods were hand sorting, especially of coarse materials, the inclined plane or cardboard method, and separation in heavy liquids. Analyses were made by physically separating and weighing of the products. Analytical products were examined by binocular microscope to detect misplaced particles. The plus 10 mesh analyses were essentially 100 percent accurate, but were by sampling reproducibility. The precision of the analyses decreased as the particle size decreased. A statistical analysis indicated that the measured mica content of the concentrate had a confidence interval of 95 percent plus or minus 5 percent. The same confidence interval for the measured tailings analysis was plus or minus 2 percent. All of the analyses reported in...
Tests were conducted on an ore sample from Arizona and two ore samples from Texas to determine the most effective crushing technique for use with the Bureaus pneumatic concentration method.
Description A sample obtained from an Arizona mica bearing pegmatite contained approximately 22 percent mica. The sample was split into three fractions to study the relative effects of the three types of crushers. Several mica sheets up to about 1.5 square inches of surface area were found in the sample, but most of the mica grains were smaller than 1 square inch of surface area. The sample was run of mine rock up to 12 inches in diameter, about 60 weight percent of which was plus 8 inches. The large size of the pieces made representative samples difficult to obtain, which accounts for the discrepancy in the mica head analyses of the three samples given in tables 1, 2, and 4. The mica was liberated at 4 mesh. The mica contained in the plus 4 mesh material was locked with quartz, plagioclase, and minor amounts of microcline. Procedure
A sample of rock was fed to the jaw crusher and screened at 1 inch. The plus 1 inch material was recycled to the jaw crusher and was again screened. These steps were repeated until all material was minus 1 inch. The sample was then fed to the pneumatic concentration system as illustrated in figure 1. The tailings from the initial plus 4 mesh concentration were recycled to the jaw crusher to liberate additional mica and fed to the pneumatic concentrator. The cycle was repeated until no plus 4 mesh tailings remained. This system resulted in a composite concentrate containing 82.1 percent mica with total recovery of 50 percent of the mica in the sample . The jaw crusher produced a large number of thick, nondelaminated mica flakes that were not recovered during pneumatic concentration. Also, the jaw crusher produced a large number of flat gangue particles that were recovered in the pneumatic concentrator and lowered the grade of the mica concentrate.
A sample of rock was run through the roll crusher prior to feeding to the same pneumatic system. This system produced a composite concentrate containing 92.2 weight percent mica with recovery of 46 percent . The roll crusher failed to effectively delaminate the mica flakes, and much mica was left in the coarse tailings. In addition, during the initial treatment of the minus 1 inch, plus 4 mesh material, a small amount of mica was produced that would not respond to pneumatic concentration due to its laminated nature. Recycling this material to the roll crusher tended to cause the rolls to lock and stop running. Hence, this plus 4 mesh book mica was removed and recovered as a separate product. For calculation purposes, it was included in the minus 1 inch, plus 4 mesh concentrate and amounted to 67.7 weight percent of this size concentrate .
China jaw crusher catalog of High Quality Stone Jaw Crusher for Mountain Rock, Single Toggle Jaw Crusher with Competitive Price provided by China manufacturer Zhengzhou Hengxing Heavy Equipment Co., Ltd., page1.
DOVE JAW CRUSHER FEATURES: High tonnage capacity of up to 1000 Tons/ Hour, and low operating cost. Designed for toughest rock material, with compressive strength of up to 320 MPa. Supplied for Primary coarse crushing and secondary Fine crushing, within the rock reduction plant. Wide range of closed side setting adjustment.
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