Nickel slag and beneficiation process

Nickel is a solid slag smelting slag produced during smelting of nickel-iron alloy, the smelting slag still a small amount of nickel-iron alloy particles, due to the high cost of nickel-iron, nickel-iron recovery of these nickel-iron smelting slag particles obtain more substantial economic Benefits, but also reduce the land occupation and environmental pollution of solid waste.

Nickel slag can be divided into dry slag and water slag according to the method of its formation. The dry slag is more massive, brittle and brittle. The formation of water slag is fine particles formed by quenching water in the molten state of the dry slag, and the specific gravity is small, and the hardness is hard and brittle. Therefore, there are certain differences in the treatment methods of dry slag and slag. For example, the dry slag is mostly blocky, and the ferronickel particles are embedded in the block dry slag. In order to recover these alloy granules, it must be crushed and ground. Break the continuum state and separate the slag from the alloy particles. Since the slag is completely dissociated from the alloy after the quenching, the slag is basically not required to be broken and ground to enter the sorting process.

After distinguishing between dry and slag, let's take a look at the composition of nickel-iron alloy. Nickel content in nickel-iron alloys above 7 is referred to as high nickel, and below 7 is referred to as low nickel. These alloys gradually decrease in magnetic permeability as the nickel content increases. When the nickel content reaches 14, the nickel-iron alloy particles have almost no magnetic properties. Therefore, in order to sort out these nickel-iron alloy particles, it is necessary to know whether the nickel residue is dry or slag, and whether the alloy is a low-nickel alloy or a high-nickel alloy.

For high-nickel alloys, due to their poor magnetic permeability, it is difficult to obtain better sorting indexes by magnetic separation method and magnetic separation equipment . Therefore, it is necessary to consider recycling by re-election method. The nickel-iron alloy has a large specific gravity and a small specific gravity of the waste residue. The nickel-iron alloy can be easily recovered from the nickel residue by a re-election method, provided that the nickel-iron alloy and the solid waste residue monomer are dissociated.

For low-nickel alloys, they are magnetic, and they can be sorted efficiently by magnetic separation equipment with medium-intensity magnetic fields, making the sorting process simpler and more convenient.

Nickel ore beneficiation process

The crushing is a three-stage and one-closed process, the maximum mass of the ore is 400mm, and the final crushed product has a particle size of 12mm. Since the grinding and flotation process has been put into production, on the basis of the original design, it has been continuously improved and improved. The original two-stage grinding and two-stage flotation process has been changed into three-stage grinding and three-stage flotation process. Grinding and flotation are divided into two parallel systems. The grinding operation of each system is matched with 1200 spiral classifier and 500mm cyclone by 6 1500×3000mm ball mills to form a three-stage closed-circuit grinding process. . The ball mill is equipped with reasonable proportioning measures, and the steel balls of 100, 80, 60 and 40mm are added according to 20%, 30%, 30% and 20% respectively. The practice proves that the effect is good, so that the final grinding fineness is up to 80%-200 mesh. The flotation operation is coarse, the sweeping is performed by JJF-4 flotation machine, and the XJK flotation machine is selected to form a three-stage flotation circuit. Adopting multi-point qualified concentrates and adding butyl ammonium black medicine and other technical measures to strengthen flotation and improve the beneficiation index. When the ore contains 1.6% nickel, the flotation nickel concentrate can be 6.3% nickel, and the recovery rate is 88% to 89%.

The dewatering process and equipment improvement, the 20 square meter cylindrical outer filter is changed into a folding belt filter, the water content of the concentrate cake can be 23% to 20%. The slurry steam heating process is used in the filtration to improve the dispersibility of the slurry, thereby further improving the filtration efficiency and reducing the moisture of the concentrate cake; the newly-built concentrate sedimentation tank is used for recovering the fine concentrate in the thickener. At the same time, it created conditions for clarifying the recycling of water.

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