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Click to add WeChatAs a strategic resource, nickel is used in military, machinery, and aerospace manufacturing industries. It is mainly made from nickel ore through beneficiation, smelting and refining. Before this process, the nickel ore needs to be beneficiated into refined nickel sludge, and then smelted to obtain finished nickel metal. In the nickel ore beneficiation operation, it is inseparable from the grinding operation. It is necessary to use various grinding equipment to grind it to a certain particle size and then sort it. So what are the common nickel ore grinding equipment? Let’s find out together below!
Currently, the grinding equipment available for nickel ore beneficiation includes grid ball mill, overflow ball mill and wet rod mill.
Grid-type ball mills for nickel mines mainly include There are three types: conventional type, energy-saving type and conical type. This type of ball mill is different from other ball mills in structural design. This is mainly because of the unique grid plate design at the discharge area, which can force the discharge of materials and reduce the amount of materials in the discharge area. The residence time in the mill reduces excessive wear and effectively improves the grinding efficiency. However, due to its forced discharge of ore, the grinding particle size of this type of ball mill is relatively coarse, and the general discharge particle size is 0.2 to 0.3 mm.
In nickel ore beneficiation plants, it is generally used in one-stage grinding operations or rough grinding operations, and is often combined with a spiral classifier to form a grinding and classification system.
Nickel oreOverflow ball mill is also divided into three types: conventional type, energy-saving type and conical type. Their structures are basically the same. The main difference lies in the different auxiliary parts selected for energy saving and consumption reduction. In addition, the conical type The cylinder structure is in a cone design. The overflow ball mill has no ore discharge grid design. When grinding, the ore will gradually move toward the discharge port according to the feeding of materials until it reaches the overflow weir and then be discharged. Therefore, the material stays in the barrel of the ball mill for a long time and is discharged. The ore speed is slower, but the grinding particle size is finer than the grid type, and the general particle size range is less than 0.2mm.
In nickel ore dressing plants, it is generally used in the second-stage grinding operation or fine grinding operation, and often forms a grinding classification system with a hydrocyclone.
Most rod mills for nickel ore are wet rod mills. Mainly, it is different from the ball mill. The medium used in the cylinder is steel rod. When processing 19~30mm materials, it can grind them to 6~10 mesh very well. Because of the characteristics of the steel rod, it can selectively grind ore. In operation, coarse-grained minerals are generally ground first, and then smaller-grained minerals are ground, which can effectively avoid excessive wear.
Rod mills can generally be used in the fine crushing stage of nickel ore, and can also be used in the coarse grinding stage. When the grinding particle size requirement in one operation is from 20 to 6 mm to 3 to 1 mm, or when the nickel ore is in the When there are delicate impurities, you can choose a rod mill.
In the actual mineral processing plant, the size of the grinding equipment needs to be determined according to the particle size requirements of nickel ore. Therefore, when selecting equipment, the appropriate ball mill or rod mill model should be customized based on the test results to improve the nickel ore grinding efficiency.
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