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Tellurium dioxide purification method

A purification method, the technology of tellurium dioxide, which is applied in the direction of binary selenium/tellurium compounds, etc., can solve the problems such as the reduction of arsenic and selenium impurities, the excessive amount of sodium sulfide, and the yellowing of the product, so as to achieve simple and clear process and recovery The effect of improving the efficiency and improving the purity

Active Publication Date: 2013-01-30
SHUI KOU SHAN NONFERROUS METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Alkali leaching, adding a small amount of sodium sulfide to the sodium tellurite solution can remove lead in the solution, but the amount of sodium sulfide should not be excessive, otherwise the 2- The residual liquid will bring a series of problems. First, it will reduce the removal rate of arsenic and selenium impurities in the product, resulting in yellowing or blackening of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: the raw material is tellurium dioxide with a content of 99.5%. The raw material composition is as attached table 1. From the attached table 1, it can be seen that the impurity components antimony, arsenic, aluminum, and silicon are relatively high, and other elements are relatively low. If you want to make the product The main component exceeds 99.9%, so we must find ways to reduce these four impurity elements.

[0020] This test is a small-scale test. The equipment used includes small stirrers, stainless steel cups and glass beakers, plastic stirring rods, vacuum pumps and other equipment. In this test, all utensils have been soaked in hydrochloric acid or brand new beakers to avoid damage to the product. Quality makes a difference.

[0021] Sodium sulfide lead removal condition test.

[0022] Adding a small amount of sodium sulfide to the sodium tellurite solution can remove the lead in the solution, but the amount of sodium sulfide must not be excess...

Embodiment 2

[0029] Example 2: The condition test of impurity remover A and impurity remover B in combination.

[0030] In order to test the combined effect of these two impurity removers. This condition test is mainly to test the effect of joint impurity removal. 99.5% of the product is used as the test raw material, and lead, arsenic, antimony, and copper are used as the investigation objects. The content of lead, arsenic, antimony, copper, and iron in the raw material is 0.065% respectively. . It can be seen that among the five impurity elements, the removal rate of lead is the highest, the removal rate of copper is the second, and the removal rate of antimony is the lowest.

[0031] Table 3 Results of combined impurity removal condition test of impurity remover A and impurity remover B

[0032]

[0033] Through the above condition test, the best technical conditions determined are: impurity remover A is 2% of the raw material amount, impurity remover B is 4% of the raw material am...

Embodiment 3

[0034] Embodiment 3: whole process test.

[0035] The results of the whole process test show that the following methods can be used to treat and purify tellurium dioxide, which can reduce ten elements of impurity elements lead, iron, copper, aluminum, arsenic, zinc, cobalt, selenium, bismuth and sulfur to a relatively low level, antimony and silicon The content of the two impurities is relatively high.

[0036] Table 4 is the raw material composition table of trial production of 99.9% tellurium dioxide;

[0037] Table 5 is the composition list of 99.9% tellurium dioxide in the whole process test;

[0038] Table 6 Metal balance table of tellurium dioxide purified and processed tellurium.

[0039] In the trial production process, 99.5% of tellurium dioxide was input, and 99.9% of tellurium dioxide was produced, leaching

[0040] Slag, solution after tellurium precipitation, washing water, because tellurium dioxide products are insoluble in water, so the tellurium content in w...

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Abstract

The invention relates to a tellurium dioxide purification method which comprises the following steps: 1, performing alkaline leaching; 2, neutralizing, 3, washing with water; and 4, drying, wherein an impurity removal agent A is added in the alkaline leaching process, and an impurity removal agent B is added in the neutralizing process of an alkaline leaching filtrate; the impurity removal agent A added in the alkaline leaching process is ferrous sulfate heptahydrate, and the impurity removal agent B added in the neutralizing process is EDTA (ethylene diamine tetraacetic acid) complexing agent; and a small amount of sodium sulfide is added in the alkaline leaching process to remove lead in the solution to ensure that no free sulfide ions exist in the solution. A precipitating impurity removal method, a complexing impurity removal method and a washing impurity removal method are organically combined, so that the content of impurity elements (such as selenium, lead, bismuth, copper, arsenium, stibium, tin, iron and the like) in the tellurium dioxide product can be directly and effectively lowered, the main components of the tellurium dioxide product are increased, the content of the main components of the tellurium dioxide product obtained after the processing steps is higher than 99.9%, and the whiteness is favorable.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a method for purifying tellurium dioxide. Background technique [0002] Conventional high-purity tellurium dioxide products are produced with metal tellurium, such as the invention patent of CN 101648702A, which discloses a method for preparing tellurium dioxide with crude tellurium as raw material, by adding crude tellurium to hydrogen peroxide Oxidation, then reduction with hydrochloric acid, and alkali neutralization to generate tellurium dioxide, and then filter and dry to obtain tellurium dioxide finished products with high precision. This method has relatively complicated production process and high production cost. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a tellurium dioxide purification method, which directly processes crude tellurium dioxide to produce a tellurium d...

Claims

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Application Information

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IPC IPC(8): C01B19/04
Inventor 付绸林何从行谭振华曾光明钟雄曾小冬胡南
Owner SHUI KOU SHAN NONFERROUS METALS LTD
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