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Vacuum smelting process of extracting selenium

A vacuum smelting and process technology, which is applied in the process field of selenium extraction from crude selenium slag, can solve the problems of low metal recovery rate, high production cost, and long process flow, and achieve high selenium capture speed, low cost, and high yield. rate effect

Active Publication Date: 2006-11-08
KUNMING UNIV OF SCI & TECH +1
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Problems solved by technology

The problems in the above traditional selenium smelting and extraction process are: long process flow, complicated process, heavy pollution, low metal recovery rate, and high production cost

Method used

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  • Vacuum smelting process of extracting selenium
  • Vacuum smelting process of extracting selenium

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Embodiment Construction

[0011] like figure 1 As shown, when the selenium raw material is neutral, the production process only includes two processes, that is, the forming and drying process of the raw material and the vacuum furnace extraction process. If the selenium raw material is acidic, a washing process should be added before the forming and drying process to wash away the waste acid and other soluble substances entrained by the selenium raw material. In the washing process, the acid-containing selenium slag is hoisted to the washing tank through the slag hopper. The average water content of the selected selenium slag is between 25% and 30%, which is 28% in this embodiment, and 23% containing acid and soluble matter. Take by weighing 350 kilograms of selenium slag (contain Se 40~60%, Te 1~3%, Cu 0.3~5%, Fe 0.5~7%, Pb 1~3%, As 0.1~1.5%, Au in the composition of selenium slag) 0.01~0.04%, Ag 0.1~0.5%, H 2 SO 4 2.05%, the content of elemental selenium in the selenium slag phase is 95.5%), add ...

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Abstract

The process of extracting selenium by vacuum smelting, its production process is divided into two processes, namely the molding and drying process of selenium raw materials and the vacuum furnace extraction process; Granulate or block, and then dry the material made into granules or blocks until the moisture content is less than 1%; the vacuum furnace extraction process is to load the granular or block materials into the material boat, and put the material boat into the vacuum furnace Vacuum roughing is carried out, and the selenium vapor distilled in the furnace flows into the selenium pot through the selenium trap and the heat preservation pipe, the furnace door is opened, the material boat is dragged out to remove the slag, and then the material is put into the material boat to repeat production. The invention has the advantages of simple production process, little pollution in the purification process, high recovery rate and low production cost.

Description

technical field [0001] The invention belongs to a selenium smelting process, in particular to a process for extracting selenium from crude selenium slag. Background technique [0002] Metal selenium and certain compounds of selenium are well-known semiconductor materials with excellent physical and chemical properties and extensive and special uses. Selenium has no independent minerals, and its content in the earth's crust is very small, only 0.0009%. It is widely distributed in sulfide minerals, such as selenium copper ore, selenium copper silver ore, etc. At present, the main raw material for extracting selenium is copper electrolytic refining anode slime, and the other part is to recover selenium from purified acid mud when pyrite is roasted to produce acid. my country is a net importer of selenium. At present, there are many methods for preparing selenium at home and abroad, generally there are the following six kinds: ① adsorption precipitation and neutralization hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/02
Inventor 杨斌张豫戴永年吴龙泉刘永成王家贵杨部正白松刘大春杨文龙马文会陈为亮姚耀春
Owner KUNMING UNIV OF SCI & TECH