Method for desulfuration and enrichment of bismuth in arsenic filter cake

Abstract

The invention discloses a method for desulfuration and enrichment of bismuth in an arsenic filter cake. The method for desulfuration and enrichment of bismuth in the arsenic filter cake comprises the following steps that (1) primary pressurizing and leaching are conducted on the arsenic filter cake, and high-sulfur pressurized leached slag and pressurized leached liquid are obtained; (2), oxidizing roasting is conducted on the high-sulfur pressurized leached slag obtained from the step (1), and oxidized roasted slag is obtained after roasting; and (3) secondary pressurizing and leaching is conducted on the obtained oxidized roasted slag obtained fro the step (2), and copper containing liquid and bismuth enriched slag are obtained. According to the method for desulfuration and enrichment of bismuth in the arsenic filter cake, by using a technology of pressurizing and leaching-oxidizing roasting-pressurizing and leaching, the steps of high-sulphur slag returning and low-sulphur bismuth slag leached medium replacing are omitted compared with an original filter cake processing technology, and high chlorine sodium wastewater is removed; by using sulfuric acid series leaching, the problem that high chlorine sodium wastewater is difficultly processed caused by excessive using of chlorine salt in an original technology is changed, the producing cost is reduced, valuable metal enriching is achieved, the recovery rate of valuable metals is improved, the valuable metal of bismuth is enriched from 3% to 50%, and for extracting quality raw materials of bismuth, the recovery rate of valuable metal of bismuth reaches above 99.5%.

Description

technical field [0001] The invention belongs to the technical field of element recovery and utilization, and in particular relates to a method for desulfurizing and enriching bismuth from an arsenic filter cake. Background technique [0002] The leaching process is the first important process in the hydrometallurgical process. The general atmospheric pressure leaching process is mostly carried out at room temperature or below the boiling point of the solution, and the leaching speed is often relatively slow, that is, a longer leaching time is required. Pressure leaching is carried out in a closed reaction vessel by increasing the reaction temperature above the boiling point of the solution. The main features are: (1) increase the leaching temperature and speed up the leaching speed, thereby greatly shortening the leaching time; (2) pressure leaching can make Some reactions that cannot be carried out under normal temperature and pressure become possible; (3) pressurization c...

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