Method for recovering valuable metal from red soil nickel minerals comprehensively

Abstract

The invention discloses a method for recovering valuable metal from red soil nickel minerals comprehensively. At present, because the red soil nickel minerals are treated by a wet method, and water contained in mineral aggregates which enter a leaching system is not controlled effectively, the water content of the mineral aggregates which enter the system is about 70 percent, the concentration of nickel ions in a leachate of the system in a nickel precipitation process cannot be enriched and is low due to large total amount of the water, and the volume of water which is needed to be treated in the system is large and the treatment cost is high. The method comprises a mineral aggregate preparation section, a leaching extraction deironing section, a chromium recovery section, a nickel precipitation section and a magnesium recovery section which are performed sequentially, and is characterized in that leaching reaction is performed under a sulfuric acid system, and the total quantity of waste water and waste residues of the system is reduced by a series of measures to improve the recovery rate of the valuable metal; and a large number of production auxiliary materials are used in the production process, and are recycled, so that the production cost is reduced substantially.

Description

technical field [0001] The invention relates to the field of hydrometallurgy of nonferrous metals, in particular to a method for comprehensively recovering valuable metals such as nickel, cobalt, iron, chromium and magnesium from laterite nickel ore. Background technique [0002] At present, the methods of wet treatment of laterite nickel ore at home and abroad can be divided into the following categories: [0003] (1) Atmospheric pressure sulfuric acid leaching method: This method uses sulfuric acid as the leaching agent, controls certain liquid-solid ratio, acidity, temperature and other reaction conditions, and extracts nickel, cobalt, iron, magnesium and other metals from the ore under normal pressure. Leaching; then adding a neutralizer (limestone, calcium hydroxide, or other alkaline substances) to remove impurities such as iron, aluminum, silicon, etc., and press-filtering the impurity-removing pulp to obtain nickel sulfate solution and scrap slag, and the scrap s...

AI Technical Summary

Problems solved by technology

The recovery rate of nickel and cobalt in this section can reach more than 90%, but the investment cost of this section is high, and the requirements for equipment and materials are relatively strict. Since impurities such as magnesium have a great impact on the consumption of sulfuric acid, this section is suitable for processing %, especially less than 5% laterite nickel ore. In addition, during the operation of this section, the equipment is prone to fouling, which has a great impact on production, and because a large amount of iron still exists in the slag, resulting in a large amount of slag, At the same time, the leaching of iron still needs to consume acid, and the comprehensive recovery and utilization of valuable metals has not been realized.

[0005] (3) Reduction roasting-ammonia leaching method: The reduction roasting-ammonia leaching section was invented by Professor Caron, so it is also called the Caron process, in which NH is used in the ammonia leaching process 3 and CO 2 The nickel and cobalt in the roasted ore are converted into ammonia complexes and enter the solution. The advantage of this section is that the reagents can be recycled and the consumption is small. The disadvantage is that the recovery rate of nickel and cobalt is low, and the recovery rates of nickel and cobalt are 75% and 60% respectively. %, and because the mineral materials need to be dried and roasted, the energy consumption is relatively large, and the comprehensive recycling of resources cannot be realized

[0010] Wet treatment of laterite nickel ore generally uses sodium salt, which causes the enrichment of sodium ions in wastewater, making it impossible to realize full reuse of wastewater

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