A method for comprehensive utilization of nickel-containing ore
A technology of ore and ore, which is applied in the field of comprehensive utilization of nickel-containing ore, can solve the problems of large amount of slag, large environmental pollution, and large investment, and achieve the effects of high resource utilization rate, no industrial waste discharge, and low investment
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Embodiment 1
[0032] The raw material is laterite nickel ore, which is separated into high-nickel and high-iron limonite and high-silicon and low-iron silicon-magnesium-nickel ore. Tiestone (Ni,Mg) 3 Si 4 o 10 (OH) 8 . The specific separation operation of laterite nickel ore is as follows:
[0033] The lateritic nickel ore with a particle size greater than 40mm enters the three-stage one closed-circuit crushing process, and after crushing and screening, it is made into finished products of +0.5mm ~ 10mm and pulp of -0.5mm. The laterite nickel ore and pulp with a particle size of less than 40mm are divided into -0.5mm pulp, +0.5mm~10mm ore and +10mm ore after tank washing, +10mm ore enters the closed-circuit crushing process, and -0.5mm pulp enters the thickener to concentrate and concentrate to High nickel and high iron iron ore, +0.5mm ~ 10mm ore is nickel-containing ore (silicon-magnesium-nickel ore). Its composition is as follows table 1:
[0034] Table 1 Grades of elements before...
Embodiment 2
[0045] (1) Ore pretreatment: Crushing and screening the nickel-containing ore as the raw material into ore sand with a particle size of 0.63-5 mm;
[0046] (2) Sulfuric acid leaching: add water to the ore obtained in step (1) to adjust the slurry to a pulp concentration of 20wt%, then add hydrochloric acid solution and hydrofluoric acid solution to mix until the acidity is 2%, and carry out heap leaching and leaching for 15 to 300 days. Then carry out solid-liquid separation to obtain leaching solution and solid; this step makes nickel, cobalt, manganese, iron, aluminum, chromium and other metals (hydroxides, oxides) in the nickel-containing ore enter the leaching solution by adding sulfuric acid to form sulfate; The silica in the nickel-containing ore does not participate in the acid-base reaction and is completely retained in the solid for the production of quartz sand;
[0047] (3) Direct nickel precipitation: Add sodium hydroxide to the leaching solution obtained in step (...
Embodiment 3
[0051] (1) Ore pretreatment: Crushing and screening the nickel-containing ore as the raw material into ore sand with a particle size of 0.63-5 mm;
[0052] (2) Sulfuric acid leaching: Add water to the ore obtained in step (1) to adjust the slurry to a pulp concentration of 50wt%, then add sulfuric acid solution and hydrochloric acid solution, which are by-products of non-ferrous metal smelters, and mix until the acidity is 70%, and perform soaking and leaching 10 to 1000 hours, and then carry out solid-liquid separation to obtain leaching liquid and solid; this step makes nickel, cobalt, manganese, iron, aluminum, chromium and other metals (hydroxides, oxides) in nickel-containing ores form sulfuric acid by adding sulfuric acid The salt enters the leaching solution; while the silica in the nickel-containing ore does not participate in the acid-base reaction and is completely retained in the solid for the production of quartz sand;
[0053] (3) Direct nickel precipitation: add ...
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