Doped high-pressure ferronickel separation method for pickle liquor

Abstract

The invention discloses a doped high-pressure ferronickel separation method for pickle liquor. According to the technical scheme, the doped high-pressure ferronickel separation method comprises the following steps that 1, a nickel-containing compound is added into the pickle liquor containing nickel and iron to serve as a doping additive, sufficient and uniform stirring is conducted, and ferronickel separation pre-liquid is obtained; 2, the ferronickel separation pre-liquid is pumped into the bottom of a first-stage reaction kettle, a high-oxygen partial pressure environment is made with pure oxygen, a sufficient reaction is performed under the combined action of stirring, gas disturbance and liquid flowing, and reaction liquid flows in a third-stage reaction kettle in an overflow mode and is discharged from the top of the third-stage reaction kettle; and 3, the discharged liquid is subjected to pressure relief to obtain ferronickel separated liquid, liquid-solid separation is conducted through the combination of thickening, filter pressing and centrifuging, the obtained solid is iron oxide powder, and the obtained liquid is reduced through SO2 and then enters an extraction system to serve as a nickel extraction stock solution. According to the the doped high-pressure ferronickel separation method, nickel and iron elements in the pickle liquor can be quickly separated, obtained iron oxide slag is low in impurity content, and resources can be fully and comprehensively utilized while the environmental protection pressure is reduced.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to a method for separating high-pressure ferronickel doped with acid leaching solution. Background technique [0002] Laterite nickel ore, crude nickel-copper alloy, and crude nickel hydroxide are common raw materials in the nickel-cobalt hydrometallurgy industry. These resources have low content of impurities such as manganese and magnesium, simple follow-up treatment process, less extraction pressure and less waste water. The advantages of less types of by-products. However, such raw materials are often accompanied by iron elements, and the pickling solution often contains more iron ions. It is difficult to achieve a good iron removal effect by using conventional iron removal methods. The resulting iron removal slag has a large amount of slag and is difficult to handle. . How to efficiently separate nickel and iron and fully realize the resource utilization of each element...

AI Technical Summary

Problems solved by technology

On the one hand, the iron removal process is divided into two stages for iron removal, which is complex and cumbersome; on the other hand, the iron removal agent is introduced to introduce impurity elements such as ammonia nitrogen and calcium to reduce the iron grade in the iron removal slag (Fe content 25%), and at the same time increase Subsequent waste water treatment pressure

[0006] In the field of hydrometallurgy, the removal of iron from acid leaching solution itself is a relatively difficult task. Conventional and mature iron removal methods have certain problems when dealing with high-iron concentration leaching solutions.

The neutralization hydrolysis method will produce a large amount of ferric hydroxide colloid, which is not only difficult to achieve liquid-solid separation, but also easily causes the adsorption loss of nickel ions

The treatment capacity of the goethite method is limited, and it is generally suitable for treating leachate with an iron ion concentration of about 5g / L. When the iron ion concentration is high, this process is difficult to implement

The jarosite method is suitable for treating leachate with high concentration of iron ions, but because the amount of slag produced by the jarosite method is large, and the sulfur content is high and the iron content is low, it is difficult to recycle, resulting in waste of resources and accumulation of waste slag

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