Method for preprocessing anode sludge and recovering dissipated metal

Abstract

The invention relates to a method for pre-processing anode mud and recycling rare metals. The invention carries out pre-processing on the anode mud of copper and lead ions and recycling the rare metals; firstly the anode mud is extracted by an acid liquid; a primary acid extraction liquid and the primary decopper anode mud are obtained by filtering; the primary decopper anode mud after being stirred and grinded with sodium carbonate is extracted by metric acid or acetic acid to obtain the deleading anode mud; after sulfated roasting for steaming selenium is carried out on the primary decopper anode mud or the deleading anode mud, the steaming selenium anode mud is extracted by the acid liquid; a secondary acid extraction liquid and the secondary decopper anode mud are obtained by filtering. The acid extraction liquid recycles the selenium and Te by reducing or recycles the slag of selenium and Te by directly adding alkali to react in the acid extraction liquid. The secondary acid extraction liquid after recycling the Te by reducing uses alkali or adds water to dilute and adjust the pH value of a filter liquid and obtain the slag of bismuth by filtering. The method of the invention has a simple flow, a high recycling rate of selenium, Te and bismuth; the noble metals can be enriched and the recycling rate of gold and silver can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a method for pretreating copper-lead anode slime and recovering scattered metals. Background technique [0002] Anode slime is composed of various substances that are insoluble in the electrolyte produced during the electrolytic refining process of copper and lead anodes. Its composition and yield are mainly related to the composition of the anode, the quality of the ingot and the technical conditions of electrolysis. During electrolysis, the base metal with negative potential dissolves into the solution, and the noble metal, scattered metal (such as selenium, tellurium, bismuth), anode powder, etc. form insoluble matter and become anode slime. [0003] The yield of anode slime is generally 0.2-1%, and its main components are Cu: 10-35%, Ag: 1-28%, Au: 0.1-1.5%, Se: 2-23%, Te: 0.5-8%, S: 2 to 10%, Pb: 1 to 25%, Ni: 0.1 to 15%, Sb: 0.1 to 10%, As: 0.1 to 5%, Bi: 0.1 to 1%, trace am...

AI Technical Summary

Problems solved by technology

The traditional pyrolysis process has strong adaptability to raw materials and large processing capacity, but its electrolysis process is complicated and lengthy, the direct recovery rate of gold and silver is not high, there is a lot of slag returning, and the production cycle is long, which affects the synthesis of copper, lead, antimony, bismuth and other metals. Low utilization rate and serious environmental pollution; the combination process of dressing and smelting has the characteristics of strong adaptability of raw materials, low construction investment, low operating cost, good quality of gold and silver products, and significantly reduced amount of harmful smoke and dust, but there are still long production cycles and many slag returns , precious metal backlog and other disadvantages; compared with the first two processes, the wet process has many advantages such as high gold and silver direct recovery rate, short process, low energy consumption, short production cycle, good comprehensive utilization benefits and environmental protection, etc., but At the same time, there are also disadvantages of strict requirements on raw materials.

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