Method for recycling selenium from tellurium deposition waste liquid

A technology for recovering selenium and waste liquid, applied in the direction of element selenium/tellurium, etc., can solve the problems of selenium dispersion, influence on the purification of tellurium dioxide, and inability to concentrate recovery, and achieve the effect of simple operation, low processing cost and easy realization

Inactive Publication Date: 2017-03-29
HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
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Problems solved by technology

For the tellurium oxide slag produced in the process of extracting gold and silver from lead anode slime, a certain amount of sodium sulfide was added to the ball mill water leaching process in order to precipitate heavy metals such as lead and copper, so that the quality of tellurium dioxide precipitated from the leaching solution is better, but Sodium sulfide is a reducing agent, which will reduce part of sodium selenite to metal selenium and enter the leach slag and tellurium dioxide, resulting in the dispersion of selenium and cannot be recovered centrally. The selenium entering tellurium dioxide will also affect the further recovery of tellurium dioxide. purify

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  • Method for recycling selenium from tellurium deposition waste liquid

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Embodiment 1

[0029] refer to figure 1 , present embodiment a kind of method that reclaims selenium from heavy tellurium waste liquid, this method comprises the following steps:

[0030] (1) Ball mill 500g of oxide slag containing tellurium selenium and add 1500g of water to obtain leachate;

[0031] (2) adding sulfuric acid to the leaching solution to obtain tellurium dioxide precipitation and tellurium sinking waste liquid;

[0032] (3) Add sulfuric acid to the tellurium sinking waste liquid in step (2) to adjust H + The concentration is 0.1mol / L, and the solution contains 1.5 g / L of selenium;

[0033] (4) Add 7.2 g of sodium sulfite to the tellurium sinking waste liquid in step (3), heat up to 80° C., stir for 1.5 hours and then filter to obtain crude selenium;

[0034] (5) Wash the crude selenium with water and dry it to remove the attached sulfate radical;

[0035] (6) Combine the selenium-precipitated liquid separated in step (4) with the washing water in step (5) and send it to t...

Embodiment 2

[0039] refer to figure 1 , a kind of method that reclaims selenium from heavy tellurium waste liquid of embodiment 2, compared with embodiment 1, there is following difference:

[0040] (1) Add 3 kg of water to 1 kg of oxide slag containing tellurium and selenium by ball milling to obtain leachate;

[0041] (2) adding sulfuric acid to the leaching solution to obtain tellurium dioxide precipitation and tellurium sinking waste liquid;

[0042] (3) Add sulfuric acid to the tellurium sinking waste liquid in step (2) to adjust H + The concentration is 0.2mol / L, and the solution contains 2.0g / L selenium;

[0043] (4) Add 9.6 g of sodium sulfite to the tellurium sinking waste liquid in step (3), heat up to 85° C., stir for 2 hours and then filter to obtain crude selenium;

[0044] Using a method for recovering selenium from tellurium-precipitating waste liquid according to this embodiment, the selenium content in the treated waste liquid is 0.06 g / L.

Embodiment 3

[0046] refer to figure 1 , a kind of method that reclaims selenium from heavy tellurium waste liquid of embodiment 3, compared with embodiment 1, there is following difference:

[0047] (1) Ball mill 500g of oxide slag containing tellurium selenium and add 1500g of water to obtain leachate;

[0048] (2) adding sulfuric acid to the leaching solution to obtain tellurium dioxide precipitation and tellurium sinking waste liquid;

[0049] (3) Add sulfuric acid to the tellurium sinking waste liquid in step (2) to adjust H + The concentration is 0.2mol / L, and the solution contains 1.8g / L selenium;

[0050] (4) Add 8.6 g of sodium sulfite to the tellurium sinking waste liquid in step (3), heat up to 90° C., stir for 2.5 hours and then filter to obtain crude selenium;

[0051] Using a method for recovering selenium from tellurium-precipitating waste liquid according to this embodiment, the selenium content in the treated waste liquid is 0.05 g / L.

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Abstract

The invention provides a method for recycling selenium from tellurium deposition waste liquid. The method comprises the following steps: (1) carrying out ball milling on oxidized dreg containing tellurium and selenium and adding water to obtain leaching liquid; (2) adding sulfuric acid into the leaching liquid to obtain tellurium dioxide sediment and the tellurium deposition waste liquid; (3) adding the sulfuric acid into the tellurium deposition waste liquid obtained in the step (2) to adjust the concentration of H<+> to be 0.1mol/L-0.3mol/L; (4) adding sodium sulfite into the tellurium deposition waste liquid obtained in the step (3) and raising the temperature to be 60 DEG C-100 DEG C, stirring for 1.5h-2.5h, and then filtering to obtain crude selenium; (5) washing the crude selenium with water and carrying out drying treatment to remove attached sulfate radicals; and (6) combining the selenium deposition waste liquid separated in the step (4) and washing water obtained in the step (5) and conveying wastewater back into a recycling tank for storing, and treating and discharging after reaching standards. The method is simple in process, high in metal recovery rate and low in production cost; energy sources are saved, and the controllability on environment pollution is good; and resources can be effectively and comprehensively recycled, and the content of the selenium in the selenium deposition waste liquid is lower than 0.1g/L.

Description

technical field [0001] The invention relates to the field of metallurgical comprehensive recovery and utilization, in particular to a method for recovering selenium from tellurium-precipitated waste liquid. Background technique [0002] In the process of extracting gold and silver by mud fire method plus electrolysis process of lead anode, a tellurium-containing oxide slag will be produced during fire refining. Because tellurium selenium is easy to form intermetallic compounds with gold and silver, during refining, tellurium selenium is oxidized under high temperature and strong oxidation conditions and sodium carbonate is added to form sodium tellurite and sodium selenite to form slag and separate gold and silver. The oxide slag containing tellurium and selenium is ball milled and leached with water to make sodium tellurite and sodium selenite enter the solution, and sulfuric acid is added to the leaching solution to adjust the pH to 5, so that tellurium is precipitated as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
CPCC01B19/02C01P2006/80
Inventor 曾志彦成泉辉李建华王松林龙建华鲁春艳
Owner HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
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