Cascade recovery method for arsenic-containing antimony-containing gold ore difficult to process

Abstract

The invention provides a cascade recovery method for arsenic-containing antimony-containing gold ore difficult to process, and relates to a method for separating and extracting antimony, arsenic and gold of the gold ore difficult to process. The method is characterized in that the recovery process includes the steps that (1) sodium sulphide is added under the alkaline condition, and antimony leaching is carried out; (2) electrodeposition is conducted on leaching liquid to obtain cathode antimony liquid; (3) leaching residues are washed, and concentrated sulfuric acid is added into the washed liquid for antimony deposition; (4) the leaching residues are roasted for arsenic removal and desulfuration, so that pozzuolite enters smoke, the smoke is chilled and crystallized to recover arsenic trioxide, and acid making with smoke is achieved after arsenic recovery; and (5) gold and silver in the roasted residues are separated after antimony, arsenic and sulphur are extracted. The method is special for the arsenic-containing antimony-containing gold ore difficult to process, the influences of arsenic and antimony on the recovery rate of noble metal are effectively eliminated, the problem that arsenic and antimony are difficult to separate is solved through selective leaching, valuable elements such as antimony, arsenic and sulphur are comprehensively recycled, and the recovery rate of gold and silver is also increased. According to the technology, raw material adaptability is high, the technology process is short, and energy consumption is low.

Description

technical field [0001] The invention discloses a cascade recovery method for refractory gold ores containing arsenic and antimony, and relates to a method for separating and extracting antimony, arsenic and gold from refractory gold ores. Background technique [0002] For antimony-containing minerals, the mainstream method of antimony treatment is antimony pyrolysis. The wet leaching electrowinning process was tried in Tinkuangshan in the 1970s, but was abandoned because the production cost was higher than that of pyro-method smelting antimony. However, the above method is suitable for antimony concentrates containing more than 40% antimony, and there is no mature technology for the treatment of low antimony minerals. [0003] At present, there is no mature technology for gold ore containing arsenic and antimony. Because the existence of antimony seriously affects the leaching and recovery rate of Au and Ag, and the physical and chemical properties of arsenic and antimony a...

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[0006] In the 1970s, Xikuangshan used alkaline leaching with sodium sulfide system, and the electrowinning of the leach solution was carried out for high-antimony-containing ores. Generally, the antimony content was about 50%, and it could not be directly applied to the separation and extraction of low-antimony-containing minerals.

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