A kind of purification method of slurry electrolyte containing antimony concentrate

Abstract

A method for purifying the slurry electrolyte containing antimony concentrate, comprising the following steps: A. Oxidation, oxidizing part of the ferrous ions into ferric ions; B. Extraction, mixing the oxidizing solution and the organic phase in a mixing tank Extraction; C. washing, so that a small amount of antimony entrained in the organic phase is transferred to the washing solution; D. blank, the washing organic phase is flowed to the clarifier at the blank level through the mixing tank for phase separation; E. back extraction, making the antimony in the organic phase Substances such as iron, copper and silicon dioxide are transferred into sodium carbonate solution and precipitated; F. Regeneration, the organic phase after stripping is mixed with the prepared regenerant in the mixing tank for regeneration. The invention solves the entrainment problem of incompatible antimony in the organic phase and realizes the recycling of the organic phase.

Description

Technical field [0001] The invention relates to a method for separating valuable metal antimony from impurity iron ions and harmful organic matter in an antimony electrolyte, in particular to a purification method of a slurry electrolyte containing antimony concentrate. Background technique [0002] The modern metallurgical production methods of metal antimony are mainly divided into two categories: fire method and wet method. At present, fire method is the main method for smelting antimony. Fire antimony smelting is mainly a volatile roasting-reduction smelting method, that is, antimony trioxide is produced first, and then reduction smelting is performed to produce crude antimony; antimony hydrometallurgy mainly has two methods: alkaline leaching and acid leaching. The pyrometallurgical antimony process has the problems of long process flow, high return material, difficulty in separating antimony and lead, and accumulation of polysulfides in antimony hydrometallurgy in alkaline ...

AI Technical Summary

Problems solved by technology

When treating complex antimony-gold concentrates with slurry electrolysis process, antimony is selectively leached in the anode area, and metal antimony is deposited and precipitated in the cathode, reaching a balance. However, about 4% of the iron in the raw material is leached into the solution, and the iron continues to accumulate, thus affecting The entire electrolysis process is carried out normally; at the same time, the organic flotation agent added in the early flotation process of the complex antimony-gold concentrate and the oil unloaded during the operation of various equipment reduce the current efficiency of antimony electrolysis and increase the unit power consumption. Therefore, it is necessary to purify, remove iron and reduce oil in the slurry electrolyte, so as to maintain the concentration of iron ions in a reasonable area

[0003] Chen Yongqiang, Liu Yong, Wang Chengyan, etc. mentioned in the "continuous expansion test of electrolysis of high arsenic antimony gold concentrate pulp electrolysis" published in the twelfth issue of nonferrous metals (smelting part) in 2015, and mentioned extraction and removal of iron, and hydrochloric acid back extraction was used in the process; Zhang Yinsheng, Wang Chengyan, Jiang Peihai, etc. published in the second issue of Nonferrous Metals (Smelting Part) in 2003 "P204 Extraction and Separation of Iron Antimony Process Research" mentioned extraction and removal of iron, washing of loaded organic phase, hydrochloric acid back extraction and back extraction The N235 iron extraction process of iron in the liquid is composed of processes such as iron extraction. The deficiencies in these two studies are: ① The iron ion in the anolyte of the slurry electrolysis in the production site exists in the form of Fe 2+ , while Fe 3+ The content is less than 1g / L, P204 mainly extracts Fe 3+ , Fe 2+ The amount of extraction is less; ② due to Fe 3+ The stripping speed in hydrochloric acid is slow, and the organic phase after stripping also contains a certain amount of Fe 3+ , so that the extraction capacity of the organic phase decreases, and it is easy to cause the emulsification of the organic phase; ③The phase separation time in the extraction and washing process is not enough, resulting in incomplete phase separation between the organic phase and the water phase, so that antimony is entrained in the organic phase, resulting in the recovery of antimony ④ N235 is used to extract iron again in the stripping liquid, which leads to high production cost and is difficult to apply in industrial production

[0004] Zhang Yonglu, Wang Chengyan, Yin Fei, etc. published in the fourth issue of Nonferrous Metals (Smelting Part) in 2016, "Research on the Separation of Antimony and Iron in Pulp Electrolytic Solution" mentioned that iron filings were used to replace antimony to achieve the separation of antimony and iron. In this study There are deficiencies: 1. sponge antimony is easy to oxidize, causing the recovery rate of antimony to decline; 2. iron is difficult to control in the production site, and the iron content in sponge antimony is high, and antimony is difficult to handle; 3. after the replacement, the liquid is ferrous chloride solution, which contains a lot of lead, Heavy metal ions such as copper and arsenic are added to the treatment of heavy metal ions such as lead, copper and arsenic when used in the wastewater treatment of mineral processing plants

[0005] The method currently adopted by Xinlong Mining Co., Ltd. to remove iron from the slurry electrolyte is to add ammonium bicarbonate to the slurry electrolyte, so that antimony and iron can be precipitated together. There are shortcomings: ① Antimony slag is difficult to recycle, stockpiling, antimony recovery ②When ammonium bicarbonate is used for precipitation, a large amount of ammonia gas is released, which affects the environment, and the production cost is high; Electrolytic efficiency and blocked pipelines affect production and high production costs

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