Feeding device and method for cadmium-removing boiling purification tank system

Abstract

The invention discloses a feeding device and a feeding method for a cadmium-removing boiling purification tank system, which are applied to a series cadmium-removing boiling purification tank system. The device comprises a zinc powder pulping device, a liquid seal device and a zinc powder pulp distributor, wherein the zinc powder pulping device, the liquid seal device and the zinc powder pulp distributor are overlapped up and down vertically and connected in a sealed manner with the inner cavities communicated; the liquid seal device has an overflowing exhaust opening; the lower part of the liquid seal device is communicated with a bottom flow pipe of a hydrocyclone; and the zinc powder pulp distributor is provided with a zinc powder pulp outlet pipe which is matched and connected with all cadmium-removing boiling purification tanks in the system. The method comprises: filling zinc powder in the zinc powder pulping device; allowing the overflowing material of the hydrocyclone to pulp the zinc powder initially and allowing the zinc powder pulp to flow into the liquid seal device to be mixed with the bottom flow of the hydrocyclone, clarifying the mixture; and allowing the zinc powder pulp from the liquid seal device to flow into the zinc powder pulp distributor, removing cadmium, allowing the zinc powder pulp to flow to the bottom of the cadmium-removing boiling purification tanks together with zinc sulfate solution and completing feeding. In the invention, closed feeding is realized, air is prevented from entering the cadmium-removing boiling purification tanks during feeding, and the device has the advantages of simple structure and convenience for operation.

Description

technical field [0001] The present invention relates to a non-ferrous metal smelting device and using method, in particular to a feeding device and a feeding method of a boiling purification tank system for removing cadmium in the process of removing cadmium in the arsenic salt cleaning process in the wet zinc smelting process. Background technique [0002] In the zinc hydrometallurgy process, the zinc sulfate solution obtained from the leaching of lead-zinc ore is sent to the electrolytic cell for electrolysis. During this process, the harmful impurities deposited in the zinc sulfate solution must be reduced as much as possible. The arsenic salt purification and impurity removal process is commonly used The impurity removal process is generally divided into three stages: the first stage of copper and chlorine removal, the second stage of cobalt and nickel removal, and the third stage of cadmium removal. Among them, cadmium removal is carried out continuously in a system com...

AI Technical Summary

Problems solved by technology

Because in the prior art, zinc powder is added once per shift, 2t-3t each time, zinc powder is mixed with cadmium-removing zinc sulfate solution from the upper part of the last boiling purification tank in solid form, and then added to the boiling purification tank Bottom, cyclone underflow is also added from the upper part of the boiling purification tank. The feeding method of cyclone underflow and zinc powder is difficult to achieve airtight feeding, which will inevitably lead to air mixing into the system. Therefore, the feeding of the existing boiling purification tank Devices and methods need to be further improved

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