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Method for removing impurity mercury from crude selenium

A technology for the removal of crude selenium, applied in the field of removing impurity mercury, can solve the problems of complex invention process, high cost, and large consumption of reagents, and achieve the effect of simple process, convenient operation, safe and controllable process

Pending Publication Date: 2021-11-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of the invention is complicated, and selenium needs to be repeatedly oxidized-reduced, and the consumption of reagents is relatively large, and the cost is relatively high

Method used

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  • Method for removing impurity mercury from crude selenium

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Effect test

Embodiment 1

[0022] A method for removing impurity mercury from crude selenium, specifically comprising the following steps:

[0023] (1) Break 50g of selenium-containing waste (mercury content 3200ppm) into a powder below 200 mesh; mix the obtained powder with sulfur (according to the molar ratio of mercury and sulfur is 1:10~1:20), briquette, press 4Mpa; put the mixed material into a closed furnace, and vulcanize for 60min at a temperature of 150°C in an inert atmosphere at a heating rate of 5°C / min to obtain a vulcanized product.

[0024] (2) The obtained sulfide product is directly subjected to vacuum distillation, the condition is that the heating rate is 5°C / min, 240°C, 1Pa, and the reaction is 100min. According to the affinity between metal mercury, selenium and sulfur, and the generated mercury sulfide and selenium The saturated vapor pressure is not the same, and selenium and mercury are separated by sulfidation-vacuum distillation; finally, selenium enters the gas phase and is co...

Embodiment 2

[0027] A method for removing impurity mercury from crude selenium, specifically comprising the following steps:

[0028] (1) Break 50g of selenium-containing waste (mercury content 3200ppm) into a powder below 200 mesh; mix the obtained powder with iron sulfide (according to the molar ratio of mercury and iron sulfide is 1:15), briquette, and the pressure is 6Mpa ; Put the mixed material into a closed furnace, and vulcanize for 45 minutes at a temperature of 200° C. to obtain a vulcanized product in an inert atmosphere at a heating rate of 10° C. / min.

[0029] (2) Vacuum distill the obtained sulfide product directly under the condition that the heating rate is 10°C / min, 260°C, 10Pa, and react for 80min. The saturated vapor pressure of selenium is different from that of selenium. Selenium and mercury are separated by sulfidation-vacuum distillation; finally, selenium enters the gas phase and is collected in the form of volatiles, forming mercury sulfide and enriching valuable e...

Embodiment 3

[0032] A method for removing impurity mercury from crude selenium, specifically comprising the following steps:

[0033] (1) Break 50g of selenium-containing waste (mercury content 3200ppm) into a powder below 200 mesh; mix the obtained powder with sodium sulfide (according to the molar ratio of mercury and sodium sulfide is 1:10), briquette, and the pressure is 8Mpa ; put the mixed material into a closed furnace, and in an inert atmosphere, the heating rate is 15°C / min, and the temperature is 250°C for 30min to vulcanize to obtain a vulcanized product.

[0034](2) Vacuum distill the obtained sulfide product directly under the condition that the heating rate is 15°C / min, 280°C, 20Pa, and react for 20min. The saturated vapor pressure of selenium is different from that of selenium. Selenium and mercury are separated by sulfidation-vacuum distillation; finally, selenium enters the gas phase and is collected in the form of volatiles, forming mercury sulfide and enriching valuable ...

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Abstract

The invention discloses a method for removing impurity mercury from crude selenium, and belongs to the technical field of purification and impurity removal of scattered metal. The method comprises the steps: adding a vulcanizing agent into crude selenium slag which is crushed to 200 meshes or below, uniformly mixing and briquetting to obtain a mixed material, putting the mixed material into a closed furnace, and heating and vulcanizing in an inert atmosphere; carrying out vacuum distillation on the vulcanized selenium, enabling the selenium to enter a gas phase and be collected in a volatile matter form, and enriching generated mercury sulfide and valuable elements and enabling the generated mercury sulfide and the valuable elements to enter residues; and carrying out secondary distillation on the obtained selenium for further mercury removal. The method is simple in process, safe and controllable in process and convenient to operate, the mercury content in the final selenium product is smaller than 5 ppm, the direct recovery rate of selenium is larger than 96%, and the removal rate of mercury is larger than 99.8%.

Description

technical field [0001] The invention relates to a method for removing impurity mercury from crude selenium, and belongs to the technical field of rare metal purification and impurity removal. [0002] technical background [0003] Selenium has excellent physical and chemical properties and is widely used in high-tech fields. However, in the process of purifying selenium, due to the volatility of mercury, the content of selenium products is relatively high, which seriously affects the quality of selenium products. Moreover, mercury is classified as a hazardous waste due to its high toxicity, bioaccumulation, and is globally recognized as a threat to human and environmental health. Therefore, the removal of mercury from crude selenium waste is a key problem to be solved in the development of selenium industry. [0004] At present, the methods for removing mercury from crude selenium mainly include wet precipitation process and fire distillation process. The wet precipitation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
CPCC01B19/02Y02P10/20
Inventor 徐宝强罗欢杨斌蒋文龙刘浪查国正熊恒田阳孔令鑫李一夫王飞杨佳曲涛刘大春
Owner KUNMING UNIV OF SCI & TECH
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