Device and method for recovering cadmium cotton through spin current electric field enhanced replacement

Abstract

The invention discloses a device and method for recovering cadmium cotton through spin current electric field enhanced replacement. The device comprises a reaction tank body, an aluminum lining cathode, a zinc bar anode, a filter bottom net, a coupling power source and a heating device. The method comprises the following steps that the reaction tank body is assembled, and a coupling electric field is arranged; a solution is added, and the pH value of the solution is adjusted; the solution is heated to make the temperature rise; in the A-stage reaction, the solution and a zinc bar anode are subjected to a replacement reaction in a spin current state; in the B-stage reaction, the solution and the zinc bar anode are continuously reacted in the spin current state and under the condition of coupling the electric field; centrifuging is conducted, the solution in the reaction tank body is evacuated, and the cadmium cotton is collected; By adoption of the device and method, the electrochemical reaction process is promoted by using the electric field, the mass transfer process is promoted by using the spin current relative to the cathode and the anode by spinning of the reaction tank body, continuous exposure of zinc wrapped in the cadmium cotton is promoted by using gravity and mechanical force friction, the recovering efficiency of the cadmium cotton is effectively improved, the zinc consumption is reduced, and the grade of the product cadmium cotton is increased.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a device and a method for recovering cadmium cotton by means of a spin current electric field enhanced displacement. Background technique [0002] In the hydrometallurgical industry, the replacement reaction is usually used to purify the electrolyte or recover the target metal. This type of replacement reaction mainly involves the reduction of a metal with a lower potential from ion to elemental substance after oxidation of a metal with a higher potential. For example, in the production process of non-ferrous metals such as lead-zinc smelting and cobalt-nickel smelting, this reaction mechanism is usually used to purify and remove impurities. [0003] In the actual production process of zinc smelting industry, the reaction process is often realized by directly adding zinc powder and mechanical stirring. In the zinc powder replacement reaction, the stirring speed has a gr...

AI Technical Summary

Problems solved by technology

This method has a certain effect, but it is difficult to use it on a large scale in the industry due to the cost of ultrasonic equipment and the harsh process environment.

In the design of patent 201510796081, zinc flakes were used instead of zinc powder in an attempt to solve the problem of large consumption and residual zinc powder

However, this design also leads to new problems, that is, after the reaction, the zinc flakes accumulate and solidify at the bottom of the reaction tank, which affects the continuity and thoroughness of the reaction.

In other methods, including adding organic extractant, adding other intermediate metals to participate in the reaction, etc., it is possible to introduce new elements, which will cause difficulties for the direct recovery of high-purity cadmium cotton or zinc electrowinning, and increase the process.

[0005] Generally speaking, the existing processing technology of cadmium-containing materials has complex process, long processing cycle, many types of chemical raw materials and equipment required, many intermediate by-product secondary materials, large consumption of zinc powder, and metal accumulation in the production process. Zinc and other disadvantages

In addition, problems such as cadmium leaching rate, low recovery rate, and easy dispersion and loss in the treatment and recovery process are the bottlenecks that need to be broken through in the current cadmium material treatment technology.

The existing technology usually uses the mechanism of displacement reaction and galvanic reaction to carry out various reactions to improve the treatment process, but these reactions only try to solve the problems of the existing process by changing the physical form of zinc participating in the reaction, and the effect is limited.

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