CN114350960A - Method for separating tellurium from soot generated in blowing process of silver-separating furnace - Google Patents
Method for separating tellurium from soot generated in blowing process of silver-separating furnace Download PDFInfo
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- CN114350960A CN114350960A CN202111622396.XA CN202111622396A CN114350960A CN 114350960 A CN114350960 A CN 114350960A CN 202111622396 A CN202111622396 A CN 202111622396A CN 114350960 A CN114350960 A CN 114350960A
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- tellurium
- separating
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- 229910052714 tellurium Inorganic materials 0.000 title claims abstract description 68
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000004071 soot Substances 0.000 title claims abstract description 35
- 238000007664 blowing Methods 0.000 title claims abstract description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 45
- 238000002386 leaching Methods 0.000 claims abstract description 44
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052709 silver Inorganic materials 0.000 claims abstract description 25
- 239000004332 silver Substances 0.000 claims abstract description 25
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000706 filtrate Substances 0.000 claims abstract description 17
- 239000010931 gold Substances 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052737 gold Inorganic materials 0.000 claims abstract description 12
- LAJZODKXOMJMPK-UHFFFAOYSA-N tellurium dioxide Chemical compound O=[Te]=O LAJZODKXOMJMPK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 8
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 8
- 235000010265 sodium sulphite Nutrition 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000011084 recovery Methods 0.000 abstract description 12
- 239000003513 alkali Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000009854 hydrometallurgy Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002893 slag Substances 0.000 abstract description 2
- 229910004273 TeO3 Inorganic materials 0.000 description 13
- 239000011734 sodium Substances 0.000 description 8
- 239000007832 Na2SO4 Substances 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- 229910003069 TeO2 Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011669 selenium Substances 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- WQGWDDDVZFFDIG-UHFFFAOYSA-N pyrogallol Chemical compound OC1=CC=CC(O)=C1O WQGWDDDVZFFDIG-UHFFFAOYSA-N 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- IIXQANVWKBCLEB-UHFFFAOYSA-N tellurium trioxide Chemical compound O=[Te](=O)=O IIXQANVWKBCLEB-UHFFFAOYSA-N 0.000 description 1
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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
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Abstract
The invention relates to a method for separating tellurium from soot generated in the blowing process of a silver separating furnace, which belongs to the technical field of metal hydrometallurgy and comprises the steps of adding the soot generated in the blowing process of the silver separating furnace into a sodium hydroxide solution for alkali leaching, adding a reducing agent to reduce high-valence tellurium in the soot into low-valence tellurium, and obtaining leaching solution containing tellurium and leaching residue containing gold and silver; returning the obtained leaching slag to a furnace to recover gold and silver, adding sulfuric acid into the obtained leaching solution to precipitate tellurium, adjusting the pH value to obtain tellurium dioxide and filtrate, repeating the steps for at least three times, and discharging the filtrate into a wastewater treatment system. The method adopts a wet alkaline leaching process to realize the recovery of tellurium in the soot, and has the advantages of simple operation, low energy consumption and excellent working environment; and by adding the reducing agent, the problem that high-valence tellurium in the soot is not easy to leach is solved, the recovery rate of tellurium can be effectively improved, and the resource utilization rate is improved.
Description
Technical Field
The invention relates to a method for separating tellurium, in particular to a method for separating tellurium from soot generated in the converting process of a silver separating furnace, and belongs to the technical field of metal hydrometallurgy.
Background
Tellurium has a wide range of applications and is increasingly used in the new materials and semiconductor industries.
In the prior art, tellurium is mainly recovered by a lead anode slime treatment method, but in the blowing process of a silver separating furnace, part of tellurium enters into smoke dust due to oxidation into tellurium dioxide and tellurium trioxide, the traditional recovery method is to return the part of smoke dust to the furnace for reduction smelting, then the part of smoke dust enters into the silver separating furnace for oxidation and flake alkali is added to make tellurium slag to recover tellurium, but tellurium is easy to volatilize and disperse at high temperature, so that the dispersion of tellurium is serious, the recovery rate is low, and the pyro recovery of tellurium has the defects of high production cost, long production period and the like. The traditional Chinese patent with publication number CN106222426B discloses a method for separating silver, selenium and tellurium from flue dust of an alloy converting converter, which adopts a wet treatment process to treat tellurium-containing soot by a pressure oxidation acid leaching process, but has high recovery energy consumption and harsh recovery conditions, requires the temperature to be more than 150 ℃ and the oxygen pressure to be more than 0.8MPa, adopts a pressure kettle for treatment, and has complex operation and higher input cost. Therefore, a method for separating tellurium from soot generated in the blowing process of the silver-separating furnace is needed, the operation is simple, the industrial production is easy, the efficiency and the energy are high, the recovery rate of tellurium is improved, and the recovery cost is reduced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides a method for separating tellurium from soot generated in the blowing process of a silver-separating furnace.
The technical scheme for solving the technical problems is as follows:
a method for separating tellurium from soot generated in a silver-separating furnace blowing process comprises the following steps:
s1, adding the ash generated in the blowing process of the silver separating furnace into a sodium hydroxide solution for alkaline leaching, and adding a reducing agent to reduce the high-valence tellurium in the ash into the low-valence tellurium, so as to obtain a leaching solution containing tellurium and leaching residues containing gold and silver;
s2, returning the leaching residue obtained in the step S1 to a furnace to recover gold and silver; adding sulfuric acid into the obtained leachate for tellurium precipitation, and adjusting the pH value to obtain tellurium dioxide and filtrate;
s3, returning the filtrate obtained in the step S2 to the step S1 for alkaline leaching, repeating the step for at least 3 times, and discharging the filtrate into a wastewater treatment system.
Further, in the step S1, the reducing agent is at least one of sodium sulfite and sodium sulfide.
Further, in the step S1, the addition amount of the reducing agent is 10-30 g/L.
Furthermore, in the step S1, the liquid-solid ratio of the sodium hydroxide solution to the soot is 5-6:1, the reaction temperature is 85-95 ℃, and the reaction time is 2-4 h.
Further, in the step S1, the concentration of the sodium hydroxide solution is 40-60 g/L.
Furthermore, in the step S2, the adding volume ratio of the sulfuric acid is 20-30%, and the pH is adjusted to 5-6.
The invention has the beneficial effects that: 1. according to the method for separating tellurium from the soot generated in the blowing process of the silver separating furnace, the recovery of tellurium in the soot is realized by adopting a wet alkali leaching process, the operation is simple, the energy consumption is low, the recovery rate of tellurium can be effectively improved, the resource utilization rate is improved, and the method is safe and environment-friendly; 2. in the process of treating the soot by the wet alkaline leaching process, the reducing agent is added to reduce the high-valence tellurium in the soot into the low-valence tellurium, so that the problem that the high-valence tellurium in the soot is difficult to leach is solved, the leaching rate of the tellurium is improved, the industrial production is easy, and the recovery cost is reduced.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The content of each element of the soot generated in the silver separating furnace refining is shown as the following table I:
table one ash content of each element%
| Element(s) | Au* | Ag | Te | Sb | Pb | As | Se |
| Content (%) | 68 | 1.99 | 3.01 | 18.66 | 20.45 | 7.50 | 0.16 |
Remarking: band element unit is g/t.
Example 1
A method for separating tellurium from soot generated in a silver-separating furnace blowing process comprises the following steps:
s1, adding the soot generated in the blowing process of the silver separating furnace into a sodium hydroxide solution according to the liquid-solid ratio of 5:1 for alkaline leaching, wherein the concentration of the sodium hydroxide solution is 50g/L, and adding a reducing agent sodium sulfite to reduce high-valence tellurium in the soot into low-valence tellurium, wherein the addition amount of the sodium sulfite is 20g/L, the reaction temperature is 90 ℃, and the reaction time is 3 hours, so as to obtain a leaching solution containing tellurium and leaching residues containing gold and silver; the reaction equation is:
TeO2+2NaOH→Na2TeO3+H2O
TeO3+Na2SO3+2NaOH→Na2TeO3+H2O+Na2SO4
s2, returning the leaching residue obtained in the step S1 to a furnace to recover gold and silver; adding sulfuric acid into the obtained leachate for tellurium precipitation, wherein the addition volume ratio of the sulfuric acid is 20%, and adjusting the pH value to 5 to obtain tellurium dioxide and filtrate;
s3, returning the filtrate obtained in the step S2 to the step S1 for alkaline leaching, repeating the alkaline leaching for 3 times, and discharging the filtrate into a wastewater treatment system.
Through detection, in step S1, the tellurium content in the leaching residue is 0.35%, and the leaching rate of tellurium reaches above 90%.
Example 2
A method for separating tellurium from soot generated in a silver-separating furnace blowing process comprises the following steps:
s1, adding the soot generated in the blowing process of the silver separating furnace into a sodium hydroxide solution according to the liquid-solid ratio of 6:1 for alkaline leaching, wherein the concentration of the sodium hydroxide solution is 55g/L, and adding reducing agents sodium sulfite and sodium sulfide to reduce high-valence tellurium in the soot into low-valence tellurium, the addition amount of the sodium sulfite is 10g/L, the addition amount of the sodium sulfide is 5g/L, the reaction temperature is 85 ℃, and the reaction time is 3 hours, so that leaching solution containing tellurium and leaching residue containing gold and silver are obtained; the reaction equation is:
TeO2+2NaOH→Na2TeO3+H2O
TeO3+Na2SO3+2NaOH→Na2TeO3+H2O+Na2SO4
TeO3+Na2S+NaOH→Na2TeO3+H2O+S
s2, returning the leaching residue obtained in the step S1 to a furnace to recover gold and silver; adding sulfuric acid into the obtained leachate for tellurium precipitation, wherein the addition volume ratio of the sulfuric acid is 30%, and adjusting the pH value to 6 to obtain tellurium dioxide and filtrate;
s3, returning the filtrate obtained in the step S2 to the step S1 for alkaline leaching, repeating the alkaline leaching for 3 times, and discharging the filtrate into a wastewater treatment system.
Through detection, in step S1, the tellurium content in the leaching residue is 0.30%, and the leaching rate of tellurium reaches above 90%.
Example 3
A method for separating tellurium from soot generated in a silver-separating furnace blowing process comprises the following steps:
s1, adding the soot generated in the blowing process of the silver separating furnace into a sodium hydroxide solution according to a liquid-solid ratio of 5:1 for alkaline leaching, wherein the concentration of the sodium hydroxide solution is 45g/L, and adding reducing agents sodium sulfite and sodium sulfide to reduce high-valence tellurium in the soot into low-valence tellurium, wherein the addition amount of the sodium sulfite is 5g/L, the addition amount of the sodium sulfide is 10g/L, the reaction temperature is 95 ℃, and the reaction time is 2 hours, so that leaching solution containing tellurium and leaching residue containing gold and silver are obtained; (ii) a The reaction equation is:
TeO2+2NaOH→Na2TeO3+H2O
TeO3+Na2SO3+2NaOH→Na2TeO3+H2O+Na2SO4
TeO3+Na2S+NaOH→Na2TeO3+H2O+S
s2, returning the leaching residue obtained in the step S1 to a furnace to recover gold and silver; adding sulfuric acid into the obtained leachate for tellurium precipitation, wherein the addition volume ratio of the sulfuric acid is 30%, and adjusting the pH value to 6 to obtain tellurium dioxide and filtrate;
s3, returning the filtrate obtained in the step S2 to the step S1 for alkaline leaching, repeating the alkaline leaching for 3 times, and discharging the filtrate into a wastewater treatment system.
Through detection, in step S1, the tellurium content in the leaching residue is 0.39%, and the leaching rate of tellurium reaches above 90%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for separating tellurium from soot generated in the blowing process of a silver-separating furnace is characterized by comprising the following steps: the method comprises the following steps:
s1, adding the ash generated in the blowing process of the silver separating furnace into a sodium hydroxide solution for alkaline leaching, and adding a reducing agent to reduce the high-valence tellurium in the ash into the low-valence tellurium, so as to obtain a leaching solution containing tellurium and leaching residues containing gold and silver;
s2, returning the leaching residue obtained in the step S1 to a furnace to recover gold and silver; adding sulfuric acid into the obtained leachate for tellurium precipitation, and adjusting the pH value to obtain tellurium dioxide and filtrate;
s3, returning the filtrate obtained in the step S2 to the step S1 for alkaline leaching, repeating the step for at least 3 times, and discharging the filtrate into a wastewater treatment system.
2. The method for separating tellurium from soot generated in a silver-separating furnace converting process according to claim 1, characterized in that: in the step S1, the reducing agent is at least one of sodium sulfite and sodium sulfide.
3. The method for separating tellurium from soot generated in a silver-separating furnace converting process according to claim 2, characterized in that: in the step S1, the adding amount of the reducing agent is 10-30 g/L.
4. The method for separating tellurium from soot generated in a silver-separating furnace converting process according to claim 1, characterized in that: in the step S1, the liquid-solid ratio of the sodium hydroxide solution to the soot is 5-6:1, the reaction temperature is 85-95 ℃, and the reaction time is 2-4 h.
5. The method for separating tellurium from soot generated in a silver-separating furnace converting process according to claim 1, characterized in that: in the step S1, the concentration of the sodium hydroxide solution is 40-60 g/L.
6. The method for separating tellurium from soot generated in a silver-separating furnace converting process according to claim 2, characterized in that: in the step S2, the adding volume ratio of the sulfuric acid is 20-30%, and the pH is adjusted to 5-6.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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