Nickel ore is the main sub-sulfide copper-nickel ore and nickel oxide ore:
Copper-nickel sulfide ore beneficiation methods, most notably flotation, magnetic separation and re-election is usually secondary beneficiation methods. Flotation of copper-nickel sulfide ore, often with the flotation of sulfide copper minerals, collector and frother.
The nickel oxide ore crushing, screening and other processes in advance to remove weak degree of weathering and low nickel-containing chunks of bedrock. Nickel oxide nickel ore is often dispersed in the gangue minerals in isomorphous, and the granularity is very fine and therefore can not be enriched mechanical beneficiation methods, only the direct smelting.
Copper-nickel ore flotation process
The flotation process: for sorting copper nickel ore is lower than the proceeds of copper-nickel mixed concentrate direct smelting into nickel matte.
Mixed – optimization of the flotation process: from ore flotation copper-nickel, elected from the mixed concentrate carved with low nickel copper concentrate and copper nickel concentrate. The nickel concentrates by smelting, nickel matte, high-nickel matte flotation separation.
Mixed – flotation and recycling part of the nickel: When are very different in the various nickel minerals in the ore can be floating, flotation of copper-nickel, and from its tailings from the flotation tailings for further recovery can floatability of nickel-containing minerals.
Nickel ore beneficiation process
Broken into three parts, a closed circuit to the nugget of 400mm, and the final crushing of the product particle size of 12mm. Since the operation, on the basis of the original design, constantly improving and perfecting the grinding and flotation processes, the two grinding and two flotation processes to the three sections of grinding, the flotation process. Grinding and flotation is divided into two parallel systems, each system of grinding operations are compatible with the 1200 spiral classifier and cyclone 500mm 6 1500 × 3000mm ball mill, composed of three sections of closed-circuit grinding process. Using a ball mill ball reasonable ratio measures, 100,80,60 and 40mm steel balls were 20%, 30%, 30%, 20% ratio is added, the practice proved effective, so that the final grinding fineness 80% -200 mesh. Flotation operations coarse, scavenger-4 JJF flotation machine, selected XJK flotation machine, composed of three sections of flotation circuit. Take a multi-point output of qualified concentrate, the Jiading Ji ammonium aerofloat technical measures to strengthen the flotation, improved beneficiation indicators. 1.6% of the nickel-containing ore available flotation of nickel concentrate containing nickel 6.3%, the recovery rate of 88% to 89%.
Dehydration process and equipment improvements, and 20 square meters of the cylindrical outer filter changed fold belt filter, concentrate filter cake moisture from 23% to 20%. Pulp steam heating process used in the filter to improve the dispersion of the slurry, which further improves the filtration efficiency, reducing the concentrate filter cake moisture; the new concentrate, sedimentation tanks, fine concentrate for recycling thickener , as well as create the conditions to clarify the water recycling.
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