A pretreatment method for purifying supernatant impurities in zinc hydrometallurgy

Abstract

The invention discloses a pretreatment method for purifying impurities in the supernatant liquid in zinc hydrometallurgy, which comprises adding manganese powder into the acidic leaching pulp of zinc hydrometallurgy for leaching and concentrating; introducing the obtained supernatant liquid with high impurities into buffer tank I And add ferrous sulfate to fully mix and dissolve; import the mixed and dissolved solution into buffer tank II and add hydrogen peroxide to fully mix and undergo a chemical reaction; introduce the mixed and chemically reacted solution into buffer tank III and add milk of lime to adjust the acidity of the solution; The solution with adjusted acidity is introduced into the buffer tank IV, and silicon purification and filter performance improver are added; the treated solution is input into the storage tank with a stirrer, and the liquid and solid are separated while stirring to obtain the pretreated supernatant and the pretreated scum. The present invention adopts the method of combining chemistry and physics to pretreat the supernatant liquid with high impurities leached from high-impurity raw materials of zinc hydrometallurgy, realize the opening of harmful impurities and suspended matter in advance, and reduce the pressure and pressure of directly using zinc powder for replacement and purification. Zinc powder is saved.

Description

technical field [0001] The invention belongs to the technical field of zinc hydrometallurgy, and specifically relates to a zinc hydrometallurgy purification medium and upper zinc hydrometallurgy with strong ore adaptability, controllable manganese ions, strong purification ability of harmful impurities, clear solution after purification, environmental protection process and continuous operation. Pretreatment method for supernatant impurities. Background technique [0002] At present, the main production process of hydrometallurgy zinc is: boiling roasting, leaching, purification, electrolysis, melting and casting; the whole production process is: zinc concentrate is boiled and roasted to produce roasted ore for leaching and acid production Sulfur dioxide flue gas; the roasted ore is leached to produce the medium supernatant directly purified with zinc powder and the leaching slag of comprehensive recovery of valuable metals; the medium supernatant is purified by zinc powder ...

AI Technical Summary

Problems solved by technology

Because the ore is relatively high in arsenic, antimony, germanium, and silicon, but the content of iron is relatively low; if the traditional neutral leaching production process is used alone, a large amount of ferrous sulfate and manganese powder need to be added to make the iron form during the leaching process. Hydrolytic purification of valence iron removes arsenic, antimony, and germanium leached into the solution; in order to remove silicon and complete hydrolysis purification, the acidity at the end point is generally controlled at pH=5.2~5.4; after a large number of experiments, it has been proved that this method has the following problems. If the amount of iron added is too large, although the arsenic, antimony, and germanium in the produced supernatant are taken away by the iron precipitated by hydrolysis and purified, the ferric hydroxide colloid formed makes it difficult to settle the leached pulp, and the high silicon content in the ore , the output rate of the supernatant is only 25~35wt%, less than 20wt% in serious cases, and the unclear suspension is large; the second is to add a large amount of manganese powder during the leaching process, and finally the manganese ions enter the solution, making the manganese ions in the electrolysis Out of control in the zinc system, affecting subsequent production

[0005] In order to solve the above-mentioned problems existing in the utilization of high-impurity zinc ore in the prior art, it is necessary to study a method for purifying the supernatant in high-impurity liquid, which can ensure the output rate of the supernatant in the middle and improve the recovery rate of zinc, and It can effectively control harmful impurity elements such as arsenic, antimony, germanium, silicon and their suspended solids in the middle and supernatant liquid, and solve the technical problem of using high-impurity zinc ore alone in hydrometallurgy

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