Method for comprehensive reclaiming elements by treating laterite-nickel ore by combination of chemical waste sulfuric acid and hydrochloric acid

Abstract

The invention discloses a method for comprehensive reclaiming elements by treating laterite-nickel ore by combination of chemical waste sulfuric acid and waste hydrochloric acid. The method comprises the following steps: stirring and extracting the prepared laterite-nickel ore with granularity of less than 0.15mm in a solid-liquid ratio that waste hydrochloric acid to minerals is (3-5):1; neutralizing extract with calcium carbonate or lime to remove iron, and precipitating nickel with lime; precipitating magnesium by adding lime after nickel is precipitated to obtain magnesium hydroxide, evaporating and crystallizing the liquid after magnesium is precipitated to produce calcium chloride dehydrate; soaking the prepared laterite-nickel ore of 2-10mm in a liquid-solid ratio of 0.5:1 for multiple times in a countercurrent manner, and neutralizing the extract with magnesium hydroxide to remove iron, and precipitating magnesium with sodium hydroxide; evaporating and crystallizing the solution after nickel is precipitated to produce magnesium sulfate heptahydrate. The process is adjustable in production scale, wide in resource utilization, simple in process flow, small in investment and low in energy consumption, can be used for comprehensively reclaiming elements, does not pollute the environment, has the advantages of high nickel reclaiming rate, simple operation and low production cost, and provides an extremely effective and economical way to effective utilization of waste sulfuric acid and waste hydrochloric acid and comprehensive reclaiming of laterite-nickel ore.

Description

technical field

[0001] The invention relates to a method for comprehensively recovering various elements of laterite nickel ore by combining chemical waste sulfuric acid and waste hydrochloric acid, especially the comprehensive utilization of low-concentration waste hydrochloric acid and waste sulfuric acid, and the method for step-by-step extraction of various elements in laterite nickel ore. The field of recycling. Background technique

[0002] The wet treatment of laterite nickel ore adopts industrial hydrochloric acid, which has a fast leaching speed, high leaching rate, and low cost of nickel precipitation, but the price of hydrochloric acid is relatively high, which is uneconomical. Using industrial sulfuric acid leaching, the leaching rate is high, but the cost of nickel precipitation in the later stage is high and uneconomical. Therefore, how to treat laterite nickel ore in a low-cost way and fully and comprehensively utilize the limited waste sulfuric acid and hydr...

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