Method for separating selenium in alkaline leachate

A leaching solution and alkaline technology, applied in the field of separating selenium in alkaline leaching solution, can solve the problems of high energy consumption of evaporation crystallization method and the alkali concentration of solution should not be too high, and achieve the effect of less equipment, large reagent consumption and good separation effect.

Active Publication Date: 2015-10-28
CENT SOUTH UNIV
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  • Claims
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Problems solved by technology

The main problem of the evaporation crystallization method is high energy consumption, and it can only deal with high selenium concentration alkaline leachate, and the alkali concentration of the solution should not be too high
[0006] The adsorption method is to utilize the adsorption capacity of solid reagents to selenite or selenate to separate selenium in the solution: for example, CN201310518720 discloses a treatment method for selenium-containing wastewater. The adsorbent it adopts is chitosan, but it is only suitable for processing Low-concentration acidic wastewater (solution pH 3-5, maximum selenium concentration 30mg / L)

Method used

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  • Method for separating selenium in alkaline leachate

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Embodiment 1

[0034] A method for separating selenium in alkaline leaching solution, its technological process is as follows figure 1 shown, including the following steps:

[0035] 1) Dilute 1L alkaline leaching solution (Se: 2g / L, OH - : 0.5mol / L) was heated to 40°C, and then Ca(OH) with a molar ratio of 1:1 2 and 3CaO·Al 2 o 3 (CaCO with a molar ratio of 3:1 3 and Al 2 o 3 After mixing evenly, place it in a muffle furnace and calcine at a temperature of 1300°C for 4 hours) and slowly add it into the alkaline leachate (3CaO·Al 2 o 3 The ratio to the number of moles of selenium element is 1:1), stirring continuously for 6h, the stirring speed is 200r / min.

[0036] 2) Filtrating the solution after step 1) to obtain selenium-containing filter residue and filtrate. After testing, the selenium concentration in the filtrate is 38mg / L, and by calculation, the selenium adsorption rate in the selenium-containing filter residue is 98.10%; the alkali is recovered from the filtrate.

[0037]...

Embodiment 2

[0040] A method for separating selenium in alkaline leaching solution, its technological process is as follows figure 1 shown, including the following steps:

[0041] 1) Dilute 1L alkaline leaching solution (Se: 10g / L, OH - : 1.5mol / L) was heated to 60°C, and then Ca(OH) with a molar ratio of 1.5:1 2 and 3CaO·Al 2 o 3 (CaCO with a molar ratio of 3:1 3 and Al 2 o 3 After mixing evenly, place it in a muffle furnace and calcinate at 1350°C for 4h) and mix it as an adsorbent and slowly add it to the alkaline leachate (3CaO·Al 2 o 3 The ratio to the number of moles of selenium element is 2:1), and the stirring is continued for 12 hours, and the stirring speed is 300r / min.

[0042] 2) Filtrating the solution after step 1) to obtain selenium-containing filter residue and filtrate. After testing, the selenium concentration in the filtrate is 87mg / L, and by calculation, the selenium adsorption rate in the selenium-containing filter residue is 99.13%; the alkali is recovered fr...

Embodiment 3

[0046] A method for separating selenium in alkaline leaching solution, its technological process is as follows figure 1 shown, including the following steps:

[0047] 1) Dilute 1L alkaline leaching solution (Se: 25g / L, OH - : 3mol / L) was heated to 80°C, and then Ca(OH) with a molar ratio of 2:1 2 and 3CaO·Al 2 o 3 (CaCO with a molar ratio of 3:1 3 and Al 2 o 3 After mixing evenly, place it in a muffle furnace and calcinate at a temperature of 1400°C for 4 hours) and mix it as an adsorbent and slowly add it to the alkaline leachate (3CaO·Al 2 o 3 The ratio to the number of moles of selenium element is 3:1), and the stirring is continued for 18 hours at a stirring speed of 500r / min.

[0048] 2) Filtrating the solution after step 1) to obtain selenium-containing filter residue and filtrate. After testing, the selenium concentration in the filtrate is 135mg / L, and by calculation, the selenium adsorption rate in the selenium-containing filter residue is 99.46%; the alkali ...

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Abstract

The invention discloses a method for separating selenium in alkaline leachate. The method comprises 1, slowly adding Ca(OH)2 and 3CaO.Al2O3 into an alkaline leaching liquid containing SeO3<2-> and / or SeO4<2->, and carrying out stirring for a reaction at a temperature of 40-80 DEG C to produce precipitates, 2, filtering the mixed solution obtained by the step 1 to obtain selenium-containing filter residue and filtrate, 3, washing the selenium-containing filter residue by deionized water many times, carrying out drying, mixing the dried selenium-containing filter residue and a chlorine salt solution, carrying out stirring, and carrying out liquid-solid separation after the reaction to obtain a selenium-containing washing lotion and a Ca-Al-Cl adsorbent which mainly comprises 3CaO. Al2O3. CaCl2. 10H2O, and 4, recovering selenium from the selenium-containing washing lotion obtained by the step 3. The method realizes adsorbent cyclic utilization and recovery of alkali in the leachate and has environmentally friendly processes.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for separating selenium in alkaline leachate. Background technique [0002] Copper anode slime is a kind of intermediate product containing valence elements such as copper, lead, antimony, selenium, tellurium and precious metals produced in the copper electrolytic refining process. After the copper anode slime is treated by alkaline metallurgical processes such as soda roasting leaching, alkaline smelting leaching, and pressurized alkaline leaching, selenium is enriched in the alkaline leaching solution. [0003] At present, the main separation methods of selenium in alkaline leachate are acidification reduction method, evaporation crystallization method and adsorption method. [0004] The acidification reduction method is to acidify the alkaline leaching solution with sulfuric acid or hydrochloric acid, and then use sulfur dioxide, sodium sulfite an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
Inventor 李栋郭学益田庆华
Owner CENT SOUTH UNIV
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