Nickel concentrate treatment process

Abstract

The invention provides a nickel concentrate treatment process. The treatment process comprises the steps that under the action of a first leaching oxidizing agent, ore pulp of nickel concentrate is subjected to first-stage heating and pressurizing treatment, and nickel-containing leachate and leaching residues containing elemental sulfur are obtained; elemental sulfur in the leaching residues containing elemental sulfur is separated, and sulfur-removed leaching residues are obtained; under the action of a second leaching oxidant, carrying out second-stage heating and pressurizing treatment onthe sulfur-removed leaching residues to obtain a leachate containing sulfuric acid and metal ions and iron-containing residues; and sequentially purifying, separating and refining the nickel-containing leachate to correspondingly obtain a nickel product, a copper product and a cobalt product. In the whole process of the process, energy is selectively utilized by utilizing the heat effect and the acid effect of the sulfur element in the system, all the elements trend to a final product, the comprehensive utilization capacity of resources is high, and no three wastes are discharged; and in addition, the treatment process is simple and reliable, the process is easy to control, investment cost is low, and benefits are high.

Description

technical field [0001] The invention relates to the field of nickel sulfide concentrate smelting, in particular to a process for treating nickel concentrate. Background technique [0002] Because nickel ore and concentrate have the characteristics of low grade, complex composition, many associated gangues, and refractory materials, the treatment method of nickel ore is relatively complicated. For nickel sulfide ore, the existing main production process is to produce high-nickel matte. Then the copper and nickel in the high nickel matte are separated and refined. Therefore, the separation and refining of copper and nickel in the high nickel matte has gradually become a more prominent problem in the nickel smelting process. With the development of nickel metallurgy technology, wet selective leaching is gradually Occupies the main position of high-nickel matte smelting in nickel metallurgy. [0003] The wet selective leaching of high-nickel matte is mainly based on the differe...

AI Technical Summary

Problems solved by technology

However, there are still some problems in this method: one is that the method has higher requirements on raw materials, the raw materials need to be low in sulfur content, and the copper-nickel ratio needs to be in a certain range (1.0~2.5:1); During the implementation process, the process is cumbersome and the response time is long

The current process requires two or three stages of normal pressure leaching, two stages of pressure leaching, the reaction time is about 16 hours for normal pressure leaching, and about 10 hours for pressure leaching; the third is that the process of this method needs sulfuric acid and copper sulfate (it may increase according to the ratio) as well as heat, increasing the cost

Fourth, the operation requirements of this method are high. Due to the presence of metal phases in the high-nickel matte, the precipitation of dangerous gases such as hydrogen and hydrogen sulfide may occur during the production process, so the investment in safety protection measures will be relatively high. In addition, due to The nature of the high-nickel matte itself has problems, resulting in high energy consumption and severe wear and tear of mechanical stirring, pumps and other power transmission equipment during the production process

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