CN104651622A - Method for separating indium from cadmium slag - Google Patents
Method for separating indium from cadmium slag Download PDFInfo
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- CN104651622A CN104651622A CN201510083522.7A CN201510083522A CN104651622A CN 104651622 A CN104651622 A CN 104651622A CN 201510083522 A CN201510083522 A CN 201510083522A CN 104651622 A CN104651622 A CN 104651622A
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- indium
- slag
- cadmium
- impurities
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to the technical field of separation of indium, in particular to a method for separating indium from cadmium slag. The specific operation comprises the following steps: washing, acid dissolution, replacement and impurity removal, replacement and electrolysis. Residual indium contained in the cadmium slag is separated from cadmium by using the hydrolysis difference between indium and cadmium; the recovery rate of indium is greater than 98%; the removal rate of cadmium reaches 90%; the method has the characteristics of low production cost, simple technological process and short production cycle; the environmental pollution of the cadmium slag is reduced; the potential safety hazard is reduced; and the method is suitable for popularization and application in wide metallurgical enterprises.
Description
Technical field
The present invention relates to a kind of separation technology field of indium, be specifically related to a kind of method of separating indium from cadmium slag.
Background technology
Removing in the smelting technology of cadmium from indium, the thick indium obtained and smart indium, except after cadmium, still contain the indium of about 20% in the cadmium slag of gained.Some enterprise can take to be taked by cadmium slag to stack process, and this treatment process has great environmental safety hidden danger and takies and waste place resource; Or cadmium slag is adopted and returns extract technology and again leach, but this method has that production cost is high, technical process and the defect such as the production cycle rate of recovery that is long and indium is low.
Therefore, how the indium in cadmium slag is extracted efficiently, separated by cadmium, to improve the rate of recovery of indium and to avoid remaining cadmium slag to cause secondary pollution, minimizing potential safety hazard, reduction production cost, shortened process and production cycle become the previous difficult problem urgently needing solution badly of order simultaneously.
Summary of the invention
For the defect of prior art, the invention provides a kind of method of separating indium from cadmium slag, can reduce cadmium slag to the pollution of environment, reduce potential safety hazard, and there is the rate of recovery that can improve indium, the feature that production cost is low, technical process is simple and with short production cycle.
Technical scheme of the present invention is:
A method for separating indium from cadmium slag, comprises following washing, acid-soluble, displacement removal of impurities, displacement and electrolysis step:
1 washing:
A. will be soaked in water containing indium cadmium slag, the mass ratio containing indium cadmium slag and water is 1:2 ~ 4, soaks 24 ~ 48 hours; Putting into rotating speed is that the stirrer of 60 ~ 120 revs/min stirs, and stirs 5 ~ 10 minutes; The indium cadmium slag water that contains after stirring is cleaned 3 times, each 8 ~ 12 minutes; Sieve; Obtain metallic particles, scavenging solution and pureed cadmium slag respectively;
B. the metallic particles of above step a gained is returned removal of impurities to purify, obtain elemental metals indium grain;
C. being neutralized to PH5.5 by adding sodium hydroxide in the scavenging solution of above step a gained, filtering, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
D. the pureed cadmium slag of above step a gained is added concentration be 31% hydrochloric acid dissolve, and the mass ratio of pureed cadmium slag and hydrochloric acid is 1:2; Add sodium hydroxide again and be neutralized to PH5.5, filter, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
2 is acid-soluble: by above step 1 gained containing the slag of indium hydroxide add concentration be 31% hydrochloric acid dissolve, the mass ratio of slag and hydrochloric acid is 1:2;
3 displacement removal of impurities: the acid-soluble rear employing aluminium sheet of slag that above step 2 contains indium hydroxide is carried out displacement removal of impurities;
4 displacements: above step 3 is replaced the solution after removal of impurities and adopt aluminium sheet to replace, obtain thick indium;
5 electrolysis: thick indium is carried out electrolysis removal of impurities purification, obtain smart indium.
Beneficial effect of the present invention is:
The present invention utilizes the difference of indium and cadmium hydrolysis, from containing indium cadmium slag, remaining indium contained by it is separated with cadmium, the rate of recovery of indium is made to be greater than 98%, the clearance of cadmium reaches 90%, and have the advantages that production cost is low, technical process is simple and with short production cycle, more can reduce the pollution of cadmium slag to environment, reduce potential safety hazard, the method is adapted at promoting the use of in vast smelter.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
The invention provides a kind of method of separating indium from cadmium slag, as shown in Figure 1, comprise following washing, acid-soluble, displacement removal of impurities, displacement and electrolysis step:
1 washing:
A. will be soaked in water containing indium cadmium slag, the mass ratio containing indium cadmium slag and water is 1:2 ~ 4, soaks 24 ~ 48 hours; Putting into rotating speed is that the stirrer of 60 ~ 120 revs/min stirs, and stirs 5 ~ 10 minutes; The indium cadmium slag water that contains after stirring is cleaned 3 times, each 8 ~ 12 minutes; Sieve; Obtain metallic particles, scavenging solution and pureed cadmium slag respectively;
B. the metallic particles of above step a gained is returned removal of impurities to purify, obtain elemental metals indium grain;
C. being neutralized to PH5.5 by adding sodium hydroxide in the scavenging solution of above step a gained, filtering, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
D. the pureed cadmium slag of above step a gained is added concentration be 31% hydrochloric acid dissolve, and the mass ratio of pureed cadmium slag and hydrochloric acid is 1:2; Add sodium hydroxide again and be neutralized to PH5.5, filter, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
2 is acid-soluble: by above step 1 gained containing the slag of indium hydroxide add concentration be 31% hydrochloric acid dissolve, the mass ratio of slag and hydrochloric acid is 1:2;
3 displacement removal of impurities: the acid-soluble rear employing aluminium sheet of slag that above step 2 contains indium hydroxide is carried out displacement removal of impurities;
4 displacements: above step 3 is replaced the solution after removal of impurities and adopt aluminium sheet to replace, obtain thick indium;
5 electrolysis: thick indium is carried out electrolysis removal of impurities purification, obtain smart indium.
Embodiment 1:
The method of the present invention's separating indium from cadmium slag, comprises following washing, acid-soluble, displacement removal of impurities, displacement and electrolysis step:
1 washing:
A. will be soaked in water containing indium cadmium slag, the mass ratio containing indium cadmium slag and water is 1:2, soaks 24 hours; Putting into rotating speed is that the stirrer of 60 revs/min stirs, and stirs 10 minutes; The indium cadmium slag water that contains after stirring is cleaned 3 times, each 10 minutes; Sieve; Obtain metallic particles, scavenging solution and pureed cadmium slag respectively;
B. the metallic particles of above step a gained is returned removal of impurities to purify, obtain elemental metals indium grain;
C. being neutralized to PH5.5 by adding sodium hydroxide in the scavenging solution of above step a gained, filtering, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
D. the pureed cadmium slag of above step a gained is added concentration be 31% hydrochloric acid dissolve, and the mass ratio of pureed cadmium slag and hydrochloric acid is 1:2; Add sodium hydroxide again and be neutralized to PH5.5, filter, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
2 is acid-soluble: by above step 1 gained containing the slag of indium hydroxide add concentration be 31% hydrochloric acid dissolve, the mass ratio of slag and hydrochloric acid is 1:2;
3 displacement removal of impurities: the acid-soluble rear employing aluminium sheet of slag that above step 2 contains indium hydroxide is carried out displacement removal of impurities;
4 displacements: above step 3 is replaced the solution after removal of impurities and adopt aluminium sheet to replace, obtain thick indium;
5 electrolysis: thick indium is carried out electrolysis removal of impurities purification, obtain smart indium.
Embodiment 2:
The method of the present invention's separating indium from cadmium slag, comprises following washing, acid-soluble, displacement removal of impurities, displacement and electrolysis step:
1 washing:
A. will be soaked in water containing indium cadmium slag, the mass ratio containing indium cadmium slag and water is 1:3, soaks 36 hours; Putting into rotating speed is that the stirrer of 90 revs/min stirs, and stirs 5 minutes; The indium cadmium slag water that contains after stirring is cleaned 3 times, each 8 minutes; Sieve; Obtain metallic particles, scavenging solution and pureed cadmium slag respectively;
B. the metallic particles of above step a gained is returned removal of impurities to purify, obtain elemental metals indium grain;
C. being neutralized to PH5.5 by adding sodium hydroxide in the scavenging solution of above step a gained, filtering, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
D. the pureed cadmium slag of above step a gained is added concentration be 31% hydrochloric acid dissolve, and the mass ratio of pureed cadmium slag and hydrochloric acid is 1:2; Add sodium hydroxide again and be neutralized to PH5.5, filter, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
2 is acid-soluble: by above step 1 gained containing the slag of indium hydroxide add concentration be 31% hydrochloric acid dissolve, the mass ratio of slag and hydrochloric acid is 1:2;
3 displacement removal of impurities: the acid-soluble rear employing aluminium sheet of slag that above step 2 contains indium hydroxide is carried out displacement removal of impurities;
4 displacements: above step 3 is replaced the solution after removal of impurities and adopt aluminium sheet to replace, obtain thick indium;
5 electrolysis: thick indium is carried out electrolysis removal of impurities purification, obtain smart indium.
Embodiment 3:
The method of the present invention's separating indium from cadmium slag, comprises following washing, acid-soluble, displacement removal of impurities, displacement and electrolysis step:
1 washing:
A. will be soaked in water containing indium cadmium slag, the mass ratio containing indium cadmium slag and water is 1:4, soaks 48 hours; Putting into rotating speed is that the stirrer of 120 revs/min stirs, and stirs 8 minutes; The indium cadmium slag water that contains after stirring is cleaned 3 times, each 12 minutes; Sieve; Obtain metallic particles, scavenging solution and pureed cadmium slag respectively;
B. the metallic particles of above step a gained is returned removal of impurities to purify, obtain elemental metals indium grain;
C. being neutralized to PH5.5 by adding sodium hydroxide in the scavenging solution of above step a gained, filtering, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
D. the pureed cadmium slag of above step a gained is added concentration be 31% hydrochloric acid dissolve, and the mass ratio of pureed cadmium slag and hydrochloric acid is 1:2; Add sodium hydroxide again and be neutralized to PH5.5, filter, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
2 is acid-soluble: by above step 1 gained containing the slag of indium hydroxide add concentration be 31% hydrochloric acid dissolve, the mass ratio of slag and hydrochloric acid is 1:2;
3 displacement removal of impurities: the acid-soluble rear employing aluminium sheet of slag that above step 2 contains indium hydroxide is carried out displacement removal of impurities;
4 displacements: above step 3 is replaced the solution after removal of impurities and adopt aluminium sheet to replace, obtain thick indium;
5 electrolysis: thick indium is carried out electrolysis removal of impurities purification, obtain smart indium.
Claims (1)
1. the method for separating indium from cadmium slag, is characterized in that, comprises following washing, acid-soluble, displacement removal of impurities, displacement and electrolysis step:
1) wash:
A. will be soaked in water containing indium cadmium slag, the mass ratio containing indium cadmium slag and water is 1:2 ~ 4, soaks 24 ~ 48 hours; Putting into rotating speed is that the stirrer of 60 ~ 120 revs/min stirs, and stirs 5 ~ 10 minutes; The indium cadmium slag water that contains after stirring is cleaned 3 times, each 8 ~ 12 minutes; Sieve; Obtain metallic particles, scavenging solution and pureed cadmium slag respectively;
B. the metallic particles of above step a gained is returned removal of impurities to purify, obtain elemental metals indium grain;
C. being neutralized to PH5.5 by adding sodium hydroxide in the scavenging solution of above step a gained, filtering, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
D. the pureed cadmium slag of above step a gained is added concentration be 31% hydrochloric acid dissolve, and the mass ratio of pureed cadmium slag and hydrochloric acid is 1:2; Add sodium hydroxide again and be neutralized to PH5.5, filter, obtain the slag containing indium hydroxide, surplus solution does wastewater treatment;
2) acid-soluble: by above step 1) gained containing the slag of indium hydroxide add concentration be 31% hydrochloric acid dissolve, the mass ratio of slag and hydrochloric acid is 1:2;
3) removal of impurities is replaced: by above step 2) carry out displacement removal of impurities containing the acid-soluble rear employing aluminium sheet of slag of indium hydroxide;
4) replace: by above step 3) displacement removal of impurities after solution adopt aluminium sheet replace, obtain thick indium;
5) electrolysis: thick indium is carried out electrolysis removal of impurities purification, obtain smart indium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510083522.7A CN104651622A (en) | 2015-02-16 | 2015-02-16 | Method for separating indium from cadmium slag |
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| CN201510083522.7A CN104651622A (en) | 2015-02-16 | 2015-02-16 | Method for separating indium from cadmium slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113337713A (en) * | 2021-05-11 | 2021-09-03 | 湖南博一环保科技有限公司 | Method for recovering zinc, lead, indium, cadmium and bismuth from zinc-containing wastewater |
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| JP2009242911A (en) * | 2008-03-31 | 2009-10-22 | Dowa Metals & Mining Co Ltd | Method for producing indium metal |
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| CN101831550A (en) * | 2010-05-21 | 2010-09-15 | 葫芦岛锌业股份有限公司 | Method for extracting indium from alkali oxidation scum rich in indium |
| CN102560123A (en) * | 2012-02-22 | 2012-07-11 | 郴州丰越环保科技有限公司 | Method for utilization and harmless treatment of multi-metal material containing arsenic and indium |
| CN103290212A (en) * | 2012-02-24 | 2013-09-11 | 于军 | Clean smelting method of indium |
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2015
- 2015-02-16 CN CN201510083522.7A patent/CN104651622A/en active Pending
Patent Citations (6)
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| JP2009242911A (en) * | 2008-03-31 | 2009-10-22 | Dowa Metals & Mining Co Ltd | Method for producing indium metal |
| CN101255502A (en) * | 2008-04-02 | 2008-09-03 | 河南豫光金铅股份有限公司 | Process for comprehensive recovery of indium, cadmium, thallium and zinc from lead system smoke |
| CN101701292A (en) * | 2009-10-20 | 2010-05-05 | 南京中锗科技股份有限公司 | Method for recovering indium and tin from ITO waste targets by utilizing oxidation method |
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| CN103290212A (en) * | 2012-02-24 | 2013-09-11 | 于军 | Clean smelting method of indium |
Non-Patent Citations (1)
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| 刘大春: ""从含锌铟复杂物料中提取金属铟新工艺的研究"", 《中国博士学位论文全文数据库（电子期刊）工程科技Ⅰ辑》, no. 1, 15 January 2012 (2012-01-15), pages 80 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113337713A (en) * | 2021-05-11 | 2021-09-03 | 湖南博一环保科技有限公司 | Method for recovering zinc, lead, indium, cadmium and bismuth from zinc-containing wastewater |
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