A kind of method that reclaims selenium from silver cyanide mud

Abstract

The invention belongs to the field of recycling of silver cyanide mud and particularly relates to a method for recycling selenium from the silver cyanide mud. Silver cyanide is treated by the aid of silver mud wetting method, gold and selenium in a selenium containing chlorine solution are reduced to be simple substances, bur picking is performed, a gold selenium mixture obtained after bur pickinghas the gold and the selenium separated with an alkali dissolution mode, the product obtained is then subjected to solid-liquid separation, solid obtained from separation enters a process to be produced to be finished gold, and the liquid is subjected to solid-liquid separation after reduction to obtain selenium powder. The method has the advantages of easy control of process conditions, brief procedure, simpleness in equipment, low cost, high product add-value, high recycling rate, low environment pollution and high economic benefit.

Description

technical field [0001] The invention belongs to the field of recycling silver cyanide mud, in particular to a method for recovering selenium from silver cyanide mud. Background technique [0002] Selenium is an important industrial raw material, widely used in metallurgy, glass, electronics, chemical industry, agriculture, medicine, biology and other fields. With the development of science and technology, selenium is widely used in various fields, especially in high-tech fields, and has certain economic value. Therefore, on the one hand, the demand for selenium continues to rise, and on the other hand, the quality requirements for selenium are also increasing. higher. [0003] At present, the recovery and treatment of selenium mainly adopts the sulfuration roasting method, and most copper smelters in China also use this method to recover selenium. The process conditions of this method are complicated to control and there is SO 2 Pollution. In this process, the temperature ...

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Problems solved by technology

[0003] At present, the recovery and treatment of selenium mainly adopts the sulfuration roasting method, and most copper smelters in China also use this method to recover selenium. The process conditions of this method are complicated to control and there is SO 2 Pollution. In this process, the temperature and acidity of the absorbing liquid are very important and difficult to control; there are also oxidation roasting methods, and the roasting temperature of the low-temperature oxidation roasting method needs to be strictly controlled, otherwise the selenium will be insufficiently oxidized or volatilized to reduce the selenium recovery rate, while High-temperature oxidation roasting is to use air to oxidize selenium above 700°C to convert it into SeO 2 Volatilize into the smoke dust, and then use SO 2 Reduction recovery, the main problem of high temperature oxidation roasting method is that the roasting process is easy to sinter, resulting in a decrease in the volatilization rate of selenium (only about 90%); another study uses the aqueous solution chlorination method, which has a serious loss of precious metals when processing materials such as anode slime , a large consumption of oxidant

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