A method for separating tellurium in crude selenium refining process

A refining process and crude selenium technology, applied in the metallurgical field, can solve the problems such as the quality of refined selenium powder cannot meet the requirements, the impurity removal effect is not good, etc., achieve good promotion value and economic benefits, shorten the production cycle, and increase the direct yield Effect

Active Publication Date: 2017-05-03
JINCHUAN GROUP LIMITED
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for separating tellurium in the complex crude selenium refining process with high tellurium content, so as to solve the problem of poor impurity removal effect and poor quality of refined selenium powder when the oxygen oxidation method is used to process crude selenium products containing high tellurium impurities. Questions that meet the requirements

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  • A method for separating tellurium in crude selenium refining process
  • A method for separating tellurium in crude selenium refining process

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Embodiment 1

[0021] A method for separating tellurium in the refining process of high tellurium-containing complex crude selenium (alloy crude selenium), wherein the mass percentage content of tellurium as an impurity in the crude selenium is 3.56%, which comprises the following steps:

[0022] Step 1, weigh the 45% sodium carbonate powder of the impurity tellurium quality contained in the coarse selenium, add in the oxidation furnace after the sodium carbonate powder is uniformly mixed with the coarse selenium;

[0023] Step 2. Heating the oxidation furnace. When the temperature of the furnace rises to 100°C, feed oxygen, and the flow rate of oxygen is controlled at 15Nm 3 / h, when the temperature rises to 500°C, increase the oxygen flow rate to 25Nm 3 / h, the pressure in the oxidation furnace is -29Mpa, and at the same time replenish water in the absorption tank of the oxidation furnace in time to ensure that the negative pressure in the furnace is stable. The feeding time is 4.21h, the...

Embodiment 2

[0026] A method for separating tellurium during the refining process of high-tellurium-containing complex crude selenium (selenium material obtained by leaching of alloy blowing acid mud), wherein the mass percentage content of tellurium as an impurity in the crude selenium is 8.11%, which includes the following steps:

[0027] Step 1, weigh the 55% sodium carbonate powder of impurity tellurium quality contained in the coarse selenium, add in the oxidation furnace after the sodium carbonate powder is evenly mixed with the coarse selenium;

[0028] Step 2: Heating the oxidation furnace. When the temperature of the furnace rises to 100°C, feed oxygen, and the flow rate of oxygen is controlled at 20Nm 3 / h, when the temperature rises to 500°C, increase the oxygen flow rate to 25Nm 3 / h, the pressure in the oxidation furnace is -30Mpa, and at the same time replenish water in the absorption tank of the oxidation furnace in time to ensure that the negative pressure in the furnace is...

Embodiment 3

[0032] A method for separating tellurium in the refining process of high-tellurium-containing complex crude selenium (sedimented selenium slag), wherein the mass percent content of tellurium as an impurity in the crude selenium is 5.11%, which comprises the following steps:

[0033] Step 1, weighing 50% sodium carbonate powder of the impurity tellurium quality contained in the coarse selenium, adding the sodium carbonate powder and coarse selenium into the oxidation furnace after being uniformly mixed;

[0034] Step 2: Heating the oxidation furnace. When the temperature of the furnace rises to 100°C, feed oxygen, and the flow rate of oxygen is controlled at 18Nm3 / h. When the temperature rises to 500°C, increase the flow rate of oxygen to 25Nm3 / h. The pressure is -32Mpa. At the same time, water is replenished in the absorption tank of the oxidation furnace in time to ensure a stable negative pressure in the furnace. The temperature in the first section of the oxidation furnace i...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a method for separating tellurium in the high tellurium containing complex crude selenium refining process. A certain amount of sodium carbonate is added to crude selenium, selenium and tellurium both can react with sodium carbonate to generate corresponding salt in the oxidation process, selenium salt is heated to be fast decomposed and volatilized at certain temperature, and generates corresponding selenium dioxide with oxygen, selenium dioxide is absorbed by water to generate a seleninic acid solution, and tellurium salt is not likely to volatilize and is mostly enriched in oxidizing slag. The oxidizing temperature of one segment of an oxidizing furnace is increased, tellurium and selenium are fully separated, the acidity of the seleninic acid solution is improved through sulfuric acid before reduction, the reduction rate of SO2 on tellurium is lowered, tellurium in the seleninic acid solution is left in the solution as much as possible, and therefore selenium and tellurium are further separated, and the quality of fine selenium powder is ensured. According to the method, the process of an oxygen oxidation method is optimized, the production period is shortened, the quantity of reagents is reduced, production cost is reduced, the direct recovery rate of selenium is improved to 94% from original 92.6%, and good popularization value and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and specifically relates to a method for separating tellurium in a complex crude selenium refining process with high tellurium content, which can effectively realize the purification of crude selenium materials with high tellurium impurities. Background technique [0002] Oxygen oxidation is the best refining process for crude selenium (grade 94-98%, tellurium content 0.005%) produced by rotary kiln sulphation and roasting, which was successfully developed in China in the late 1970s and has been used in practice for a long time. The process has the advantages of short process, low cost, high yield and simple operation. However, with the transformation of the copper anode slime treatment process, the grade and impurities of crude selenium produced are also different, such as the precipitated selenium slag (85% grade, 2-7% tellurium content) obtained by pressure leaching of copper anode slime, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/02
Inventor 宋宏儒王军洪渊陈云峰吴建明
Owner JINCHUAN GROUP LIMITED
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