Method for preparing germanium concentrate from germanium-containing leaching solution by zinc powder replacement method

Abstract

The invention discloses a method for preparing germanium concentrate from germanium-containing leachate through utilizing a zinc powder replacement method, relates to the technical field of wet metallurgy, and in particular relates to a method for preparing germanium concentrate from germanium-containing leachate through utilizing a zinc powder replacement method. The method for preparing germanium concentrate from germanium-containing leachate through utilizing the zinc powder replacement method is characterized in that germanium-containing materials such as residues and dust which contain germanium can be leached out through sulfuric acid, and the germanium-containing leachate is obtained. The preparation method comprises the following specific steps of: 1, purifying; 2, germanium replacing; and 3, zinc sulfate crystal preparing. According to the method for preparing germanium concentrate from germanium-containing leachate through utilizing the zinc powder replacement method, zinc powder can be utilized to sequentially replace various impurities in the germanium-containing sulfuric acid leachate under a proper acid condition, so that a conventional technological process is simplified, the germanium extraction cost is lowered, the recovery rate of the germanium is increased, and the quality of the zinc sulfate obtained by the method is also high.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for preparing germanium concentrate from a germanium-containing leaching solution by using a zinc powder replacement method. Background technique [0002] There are many raw materials used to extract germanium, such as germanium-containing zinc oxide fumes produced by rotary kilns (generally containing 0.005-0.2% germanium), electric furnace zinc distillation residue (generally containing 0.05-2.0% germanium), germanium chloride distillation residue ( Generally contain germanium 0.1-0.5%), low-content coal germanium dust (generally contain germanium 0.05-1.0%), etc., in addition to various germanium-containing solutions and germanium-containing slags in the germanium production process, such as germanium tetrachloride hydrolysis Mother liquor, germanium lime neutralization slag, etc. When germanium is extracted from these materials, acid or alkali is generally u...

AI Technical Summary

Problems solved by technology

In this method, the recovery rate of germanium depends on the source of germanium raw materials, and the pretreatment process is also different. The amount of germanium in the medium is 45-70 times, the amount of tannin is 25-35 times, and due to the use of tannin extract, the zinc sulfate solution is yellow, and activated carbon is required for decolorization in the subsequent zinc sulfate solution purification process , leading to a long process route and a large consumption of activated carbon. It is more difficult to decolorize the subsequent germanium if only tannin extract is used to precipitate germanium. At the same time, it has a great impact on the quality of zinc sulfate or the process of electrolytic zinc. Therefore, it is necessary to use tannin extract and tannin acid at the same time.

At present, the price of tannins on the market is about 12,000 yuan / ton, that of tannin is 50,000-60,000 yuan / ton, that of zinc sulfate is 7,000-8,000 yuan / ton, and that of electrolytic zinc is 15,000 yuan / ton. The price is expensive. Although the recovery rate of germanium from the solution is high, the comprehensive recovery cost is also increased accordingly. There are also problems such as incomplete precipitation of germanium during precipitation, high power consumption and labor costs during drying and roasting of deposited germanium slag, and high cost of roasting. Problems such as the loss of germanium will also be caused during the process, and these links will often cause the recovery rate of germanium to be on the low side. Therefore, it is necessary to find an efficient and economical recovery process method to reduce the cost of extracting germanium and improve the recovery rate of germanium