CN110980916B - Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition - Google Patents

Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition Download PDF

Info

Publication number
CN110980916B
CN110980916B CN201911115427.5A CN201911115427A CN110980916B CN 110980916 B CN110980916 B CN 110980916B CN 201911115427 A CN201911115427 A CN 201911115427A CN 110980916 B CN110980916 B CN 110980916B
Authority
CN
China
Prior art keywords
barren solution
cyanogen
manganese
thiocyanate
filtrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201911115427.5A
Other languages
Chinese (zh)
Other versions
CN110980916A (en
Inventor
李斌川
张建元
韩庆
林明国
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liaoning Xindu Gold Co Ltd
Northeastern University China
Original Assignee
Northeastern University China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northeastern University China filed Critical Northeastern University China
Priority to CN201911115427.5A priority Critical patent/CN110980916B/en
Publication of CN110980916A publication Critical patent/CN110980916A/en
Application granted granted Critical
Publication of CN110980916B publication Critical patent/CN110980916B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/18—Cyanides

Abstract

The invention provides a method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition, which comprises the following steps: 1) controlling the pH value of the cyanogen-containing barren solution to be less than 2, and adding manganese oxide or manganese oxide and hydrogen peroxide to carry out oxidative decomposition on thiocyanate in the cyanogen-containing barren solution; 2) filtering the cyanide-containing barren solution subjected to oxidative decomposition to obtain precipitation slag and filtrate, adjusting the pH value of the obtained filtrate to 6-12, and then adding an oxidizing substance to remove manganese in the filtrate; 3) filtering the liquid subjected to demanganization in the step 2) to obtain purified barren solution and manganese-containing oxide precipitation slag, and directly drying the manganese-containing oxide precipitation slag or returning the manganese-containing oxide precipitation slag to the step 1) for oxidizing and decomposing thiocyanate in the cyanogen-containing barren solution to realize the recycling of manganese oxide; and the purified barren solution is discharged after being returned to cyaniding leaching or deep oxidation to reach the standard. The method for degrading the thiocyanate in the cyanogen-containing barren solution under the acidic condition has the advantages of low cost, simple process and convenient operation.

Description

Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method for degrading thiocyanate in cyanogen-containing barren solution under an acidic condition.
Background
Because the gold extraction process by the cyanidation method has the advantages of mature process, simple operation, lower cost and the like, more than 80 percent of gold in the world is extracted by the cyanidation method, so a large amount of cyanide-containing barren solution is generated in the production process. Because the cyanogen-containing barren solution is recycled for a long time, impurity ions (mainly Cu, Zn, Fe and the like) in the solution are gradually accumulated, so that the components are complex, the concentration of total cyanogen and thiocyanate is higher, the sum of the total cyanogen and the thiocyanate can reach 1 percent or even higher, and the cyanogen-containing barren solution is difficult to effectively treat and discharge after reaching the standard. Therefore, how to safely and efficiently treat the cyanogen-containing barren solution in an environment-friendly way is a difficult problem in the industry and a 'triphone' for inhibiting the development of enterprises.
At present, the cyanogen-containing barren solution is treated mainly by a chemical method and a physical recovery method. The chemical method mainly adopts a method of destroying cyanide, and adds an oxidant to oxidize the cyanide into nontoxic carbonate, carbon dioxide, ammonium salt and nitrogen, such as an alkaline chlorination method, a hydrogen peroxide method, a sulfur dioxide-air method, a microbiological method, a direct electrolysis method, a photocatalytic degradation method and the like. The physical recovery method mainly utilizes the physical and chemical properties of cyanide and cyanide complex, such as acidification recovery method, ion exchange, solvent extraction, etc. For the treatment of high-concentration cyanogen-containing barren solution, the chemical method has the defects of large medicament consumption, generation of a large amount of precipitation slag in production, incapability of recycling, high treatment cost and the like. Although the cyanide can be recovered by the acidification recovery method, the cyanide basically does not play a role in degrading the thiocyanate, so that the acidified barren solution has high content of the thiocyanate and is continuously accumulated in the recycling process, the salt content and Chemical Oxygen Demand (COD) of the solution seriously exceed the standard, and pipelines are easy to generate 'crystallization' blockage, thereby influencing normal leaching. The conventional chemical oxidation method has the defects of poor degradation effect on thiocyanate in acidizing fluid, high consumption of chemical reagents, special equipment, easiness in generating secondary pollution, complex purification process, complex operation, high purification cost and the like. Therefore, the healthy development of the gold smelting industry is always restrained.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for degrading thiocyanate in cyanogen-containing barren solution under the acidic condition, which has the advantages of low cost, simple process and convenient operation, and can recycle an oxidizing agent.
In order to solve the technical problem, the invention provides a method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition, which comprises the following steps:
1) controlling the pH value of the cyanogen-containing barren solution to be less than 2, and adding manganese oxide or manganese oxide and hydrogen peroxide to carry out oxidative decomposition on thiocyanate in the cyanogen-containing barren solution;
2) filtering the cyanide-containing barren solution subjected to oxidative decomposition to obtain precipitation slag and filtrate, adjusting the pH value of the obtained filtrate to 6-12, and then adding an oxidizing substance to remove manganese in the filtrate;
3) filtering the liquid subjected to demanganization in the step 2) to obtain purified barren solution and manganese-containing oxide precipitation slag, and directly drying the manganese-containing oxide precipitation slag or returning the manganese-containing oxide precipitation slag to the step 1) for oxidizing and decomposing thiocyanate in the cyanogen-containing barren solution to realize the recycling of manganese oxide; and the purified barren solution is discharged after being returned to cyaniding leaching or deep oxidation to reach the standard.
Further, the manganese oxide is a manganese oxide in which + 2-valent, + 3-valent and + 4-valent manganese elements coexist.
Further, the addition amount of the manganese oxide is 0.4-2 times of the theoretical amount of the thiocyanate in the cyanogen-containing barren solution.
Further, the reaction temperature of removing manganese in the filtrate by the oxidizing substances is 25-90 ℃, and the reaction time is 1-8 hours.
Further, the oxidizing substance is air, oxygen-rich gas, or a mixed gas of sulfur dioxide and air.
Further, the adding amount of the oxidizing substance is Mn in the filtrate2+0.8-2 times of theoretical amount.
The invention provides a degradation method of thiocyanate in acidified and stripped cyanogen-containing barren solution, which comprises the steps of firstly oxidizing and decomposing the acidified cyanogen-containing barren solution by manganese dioxide or pyrolusite to ensure that SCN in the acidified cyanogen-containing barren solution-Oxidative decomposition of SCN in solution-The concentration is reduced to below 50 ppm; adjusting the pH value to 6-12, and adding an oxidizing substance to oxidize and remove manganese to remove Mn in the solution2+Ionic oxidation to hydrated manganese dioxide; and finally, filtering to obtain precipitation slag and purified filtrate, returning the precipitation slag to the process to be used as an oxidant for continuous use, and returning the purified barren solution to cyaniding and leaching, thereby realizing the recycling of substances, reducing the production cost and having remarkable economic benefit. In addition, the method for degrading the thiocyanate in the cyanogen-containing barren solution after acidification stripping has the advantages of simple process and convenient operation, and does not produce secondary pollution, thereby reducing the pollution to the environment and protecting the environment.
Drawings
FIG. 1 is a flow chart of a method for degrading thiocyanogen in a cyanogen-containing barren solution under acidic conditions according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the method for degrading thiocyanate in a cyanogen-containing barren solution under an acidic condition provided by the embodiment of the invention can be used for degrading thiocyanate in a cyanogen-containing barren solution under an acidic condition, and the components and the content of the components in the cyanogen-containing barren solution under an acidic condition are shown in table 1.
TABLE 1 main component (ppm) of cyanogen-containing barren solution under acidic conditions
Figure BDA0002273906510000031
Table 2 manganese oxide composition (%)
Figure BDA0002273906510000032
The method for degrading the thiocyanate in the cyanogen-containing barren solution under the acidic condition, provided by the embodiment of the invention, specifically comprises the following steps:
controlling the pH value of the cyanogen-containing barren solution to be less than 2, adding manganese oxide (the manganese oxide can be manganese dioxide, and can also be a precipitate obtained by oxidizing, removing manganese and filtering in the subsequent step, wherein manganese elements in the precipitate coexist in a valence state of +4, +3, a valence state of +2 and the like), or manganese oxide/hydrogen peroxide to carry out oxidative decomposition on the thiocyanate, and stirring for reacting for 1-8 hours, wherein the addition amount of an oxidant is 0.4-2 times of the theoretical amount of the thiocyanate in the cyanogen-containing barren solution.
Filtering the cyanogen-containing barren solution to obtain precipitate slag and filtrate containing calcium sulfate and the like; and adjusting the pH value of the obtained filtrate to 6-12, and then adding an oxidizing substance to remove manganese in the liquid. Wherein the oxidizing substance is air, oxygen, hydrogen peroxide, mixed gas of sulfur dioxide/air, oxygen-enriched gas, etc., wherein the sulfur dioxide is derived from sodium sulfite, sodium pyrosulfite, sodium bisulfite or sodium thiosulfate, etc. The addition amount of the oxidizing substance is Mn in the filtrate2+0.8-2 times of theoretical amount. Adding an oxidizing substance into the filtrate for oxidation and manganese removal at the reaction temperature of 25-90 ℃ for 1-8 hours, and then adding Mn into the filtrate2+Recovering the oxidized solids, which are doped with +4, +3 and +2 manganese elements, by returning the solids to the pH<2 for carrying out oxidative decomposition on the thiocyanate in the cyanogen-containing barren solution. Due to Mn formed in the solid3O4The activity is higher, and the reaction speed is higher compared with manganese dioxide.
Thirdly, filtering the liquid obtained in the second step to obtain purified barren solution and manganese-containing precipitated slag (manganese oxide), and returning the manganese-containing precipitated slag to the first step directly or after blast drying to realize the recycling of the manganese oxide; the purified barren solution is discharged after being returned to cyaniding leaching or deep oxidation reaching the standard.
The main reaction equation for this process occurs as follows:
4MnO2+SCN-+8H+＝4Mn2++CO2+SO4 2-+NH4 ++2H2O (1)
Mn2++O2+(n+2)H2O＝MnO2·nH2O+SO4 2-+4H+ (2)
Mn2++SO2+O2+(n+2)H2O＝MnO2·nH2O+SO4 2-+4H+ (3)
6Mn2++O2+12OH-＝2Mn3O4+6H2O (4)
the method for degrading the thiocyanate in the cyanogen-containing barren solution under the acidic condition is used for treating the coking wastewater containing high-concentration thiocyanate, has the advantages of simple process, low cost, no secondary pollution, environmental friendliness and high application value and social benefit, and can reduce environmental pollution.
The following examples are provided to illustrate the degradation method of thiocyanate in cyanogen-containing barren solution under acidic condition.
Example 1
Take 1m3Adjusting pH of the acidified barren solution (main components shown in Table 1) to 1, adding 56.4kg manganese oxide (main components shown in Table 2), stirring for reaction for 4 hr, and filtering to obtain filtrate; adjusting the pH value of the filtrate to 11 by using lime, blowing air to keep the temperature at 60 ℃, and stirring for reacting for 2 hours; filtering to obtain precipitation slag and purified filtrate, wherein the content of thiocyanate in the filtrate is 11.54ppm, the content of cyanide in the filtrate is 23.58ppm, the filtrate is returned to leaching, and the precipitation slag is returned to recycle; after five times of recycling of the precipitation slag, the content of the thiocyanate radical is 20.24ppm, and the content of the cyanide radical is 24.12 ppm.
Example 2
Take 1m3Adjusting pH of the acidified barren solution (main components shown in Table 1) to 0.8, adding 60kg of manganese oxide (main components shown in Table 2), stirring for reaction for 2 hr, and filtering to obtain filtrate; adjusting the pH value of the filtrate to 9.5, adding 18kg of sodium bisulfite, blowing air to keep the temperature at 45 ℃, and stirring for reacting for 8 hours; filtering to obtain precipitation slag and purified filtrate, wherein the content of thiocyanate in the filtrate is 21.74ppm, the content of cyanide in the filtrate is 19.58ppm, the filtrate is returned to leaching, and the precipitation slag is returned to recycle; after five times of recycling of the precipitation slag, the content of thiocyanate radical is 19.96ppm, and the content of cyanogen radical is 20.12 ppm.
Example 3
Take 1m3Adjusting pH value of the acidified barren solution (main components are shown in table 1) to 1, adding 70kg of manganese oxide (main components are shown in table 2), stirring for reacting for 8 hours, and filtering to obtain filtrate; adjusting the pH value of the filtrate to 12 by using lime, adding 25kg of sodium metabisulfite, blowing air to keep the temperature at 65 ℃, and stirring for reacting for 4 hours; filtering to obtain precipitation slag and purified filtrate, wherein the content of thiocyanate in the filtrate is 9.21ppm, the content of cyanide in the filtrate is 14.89ppm, the filtrate is returned to leaching, and the precipitation slag is returned to be recycled; after five times of recycling, the content of thiocyanate radical is 15.78ppm, and the content of cyanogen radical is 18.57 ppm.
Example 4
Take 1m3Adjusting pH of the acidified barren solution (main components are shown in Table 1) to 0.8, adding 60kg of manganese oxide (main components are shown in Table 2), adding 10L of hydrogen peroxide, stirring for reacting for 8 hours, and filtering to obtain filtrate; adjusting the pH value of the filtrate to 12 by using lime, blowing air to keep the temperature at 60 ℃, and stirring for reacting for 4 hours; filtering to obtain precipitation slag and purified filtrate, wherein the content of thiocyanate in the filtrate is 29.98ppm, the content of cyanide in the filtrate is 13.78ppm, the filtrate is returned to leaching, and the precipitation slag is returned to recycle; after five times of recycling of the precipitation slag, the content of thiocyanogen is 35.57ppm, and the content of cyanide is 15.95 ppm.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (5)

1. A method for degrading thiocyanogen in cyanogen-containing barren solution under acidic condition is characterized by comprising the following steps:
1) controlling the pH value of the cyanogen-containing barren solution to be less than 2, and adding manganese oxide coexisting with manganese elements with the valence of +2, +3 and +4, or manganese oxide coexisting with manganese elements with the valence of +2, +3 and +4 and hydrogen peroxide to carry out oxidative decomposition on thiocyanate radicals in the cyanogen-containing barren solution;
2) filtering the cyanide-containing barren solution subjected to oxidative decomposition to obtain precipitation slag and filtrate, adjusting the pH value of the obtained filtrate to 6-12, and then adding an oxidizing substance to remove manganese in the filtrate;
3) filtering the liquid subjected to demanganization in the step 2) to obtain purified barren solution and manganese-containing oxide precipitation slag, and directly drying the manganese-containing oxide precipitation slag or returning the manganese-containing oxide precipitation slag to the step 1) for oxidizing and decomposing thiocyanate in the cyanogen-containing barren solution to realize the recycling of manganese oxide; and the purified barren solution is discharged after being returned to cyaniding leaching or deep oxidation to reach the standard.
2. The method according to claim 1, wherein the degradation of thiocyanate radicals in the cyanogen-containing barren solution under acidic conditions is carried out by: the addition amount of the manganese oxide is 0.4-2 times of the theoretical amount of the thiocyanate radical in the cyanogen-containing barren solution.
3. The method according to claim 1, wherein the degradation of thiocyanate radicals in the cyanogen-containing barren solution under acidic conditions is carried out by: the reaction temperature for removing manganese in the filtrate by the oxidizing substances is 25-90 ℃, and the reaction time is 1-8 hours.
4. The method according to claim 3, wherein the degradation of thiocyanate in the cyanogen-containing barren solution under acidic condition is carried out by: the oxidizing substance is air, oxygen-enriched gas or a mixed gas of sulfur dioxide and air.
5. The method according to claim 4 for degrading thiocyanates in cyanogen-containing barren solution under acidic conditionThe method is characterized in that: the addition amount of the oxidizing substance is Mn in the filtrate2+0.8-2 times of theoretical amount.
CN201911115427.5A 2019-11-14 2019-11-14 Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition Active CN110980916B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911115427.5A CN110980916B (en) 2019-11-14 2019-11-14 Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911115427.5A CN110980916B (en) 2019-11-14 2019-11-14 Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition

Publications (2)

Publication Number Publication Date
CN110980916A CN110980916A (en) 2020-04-10
CN110980916B true CN110980916B (en) 2021-03-26

Family

ID=70084492

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911115427.5A Active CN110980916B (en) 2019-11-14 2019-11-14 Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition

Country Status (1)

Country Link
CN (1) CN110980916B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115028293A (en) * 2022-07-19 2022-09-09 东北大学 Method for treating cyanide-containing wastewater by using manganese dioxide in synergistic oxidation mode
CN116251325B (en) * 2022-12-17 2024-04-02 山东(烟台)中日产业技术研究院(烟台市产业技术研究院) Degradation method of thiocyanate radical in cyanidation tailings

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2163958A6 (en) * 1971-12-08 1973-07-27 Air Liquide Cyanide washings - are converted to harmless cyanate by automatic additions of oxidising agent
CN101549916A (en) * 2008-03-31 2009-10-07 李成心 Method for treating electroplating cyanide waste water
CN102030436A (en) * 2009-09-30 2011-04-27 北京中科国益环保工程有限公司 Method for treating sulfite-containing wastewater
CN107381768A (en) * 2017-09-01 2017-11-24 河北旭阳焦化有限公司 A kind of continuous processing technique of spent lye
CN109735715A (en) * 2019-01-30 2019-05-10 东北大学 A method of the short route green circulatory of lean solution containing cyanogen utilizes

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63291689A (en) * 1987-05-25 1988-11-29 Tanaka Kikinzoku Kogyo Kk Treatment of waste water separated from metal cyanide
DE4110055A1 (en) * 1991-03-27 1992-10-01 Degussa METHOD FOR DETOXIFYING CYANIDIC AQUEOUS SOLUTIONS
JP3786888B2 (en) * 2002-03-14 2006-06-14 日本碍子株式会社 Operation method of manganese contact tower
KR102119234B1 (en) * 2015-05-22 2020-06-04 카타야마 케미칼, 인코포레이티드 How to treat cyanide-containing wastewater
CN106946404B (en) * 2017-03-06 2019-09-24 博天环境集团股份有限公司 A kind of processing method of cyanide wastewater
CN106957115A (en) * 2017-04-05 2017-07-18 绍兴柯桥江滨水处理有限公司 A kind of processing system and processing method of sulfur-bearing cyanogen waste water

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2163958A6 (en) * 1971-12-08 1973-07-27 Air Liquide Cyanide washings - are converted to harmless cyanate by automatic additions of oxidising agent
CN101549916A (en) * 2008-03-31 2009-10-07 李成心 Method for treating electroplating cyanide waste water
CN102030436A (en) * 2009-09-30 2011-04-27 北京中科国益环保工程有限公司 Method for treating sulfite-containing wastewater
CN107381768A (en) * 2017-09-01 2017-11-24 河北旭阳焦化有限公司 A kind of continuous processing technique of spent lye
CN109735715A (en) * 2019-01-30 2019-05-10 东北大学 A method of the short route green circulatory of lean solution containing cyanogen utilizes

Also Published As

Publication number Publication date
CN110980916A (en) 2020-04-10

Similar Documents

Publication Publication Date Title
US9657370B2 (en) Removal method of manganese from waste water
CN111498918B (en) Wet treatment process for ferronickel material
CN110980916B (en) Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition
JP2010126778A (en) Method for producing sulfide containing nickel and cobalt
US10995413B2 (en) Sulfide recycling in manganese production
CN112210679A (en) Method for preparing nickel sulfate from nickel hydroxide cobalt
CN109735715A (en) A method of the short route green circulatory of lean solution containing cyanogen utilizes
JP4382556B2 (en) Treatment method of wastewater containing cyanide
CN111847702B (en) Method for treating cyanide-containing high-concentration ammonium sulfite wastewater
CN112609090B (en) Separation method of copper-cobalt oxide ore
US5482694A (en) Regeneration of cyanide by oxidation of thiocyanate
CN110396595B (en) Efficient decomposition method of manganese dithionate in manganese ore sulfur dioxide leaching solution
CN110102009B (en) Method for catalytic oxidation of thiocyanide
CN110484729A (en) A method of the basic zinc salt of lean solution containing cyanogen-mantoquita combined purifying
CN110373541A (en) A kind of method that manganese oxide ore direct reducing leaching prepares manganese sulfate solution
CN112299590A (en) Method for treating cyanide-containing ammonium sulfite wastewater
CN110255509A (en) A kind of technique for producing tellurium dioxide
JP3294181B2 (en) Method for producing calcium arsenate
CA2366294A1 (en) Methods of purifying cobalt
KR20160124160A (en) PROCESS FOR REDUCING THE AMOUNTS OF ZINC(Zn) AND LEAD(Pb)IN MATERIALS CONTAINING IRON(Fe)
JP4639309B2 (en) Treatment method of wastewater containing cyanide
CN111111086B (en) Treatment method of cyanide-containing barren solution precipitation slag
CN113005294A (en) Treatment method of cyaniding tailings
CN110902894A (en) Cyanide-containing wastewater treatment system and method
CN112176183A (en) Method for recovering gold from acidic thiourea gold leaching solution by controlling potential

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20220129

Address after: 110819 No. 3 lane, Heping Road, Heping District, Shenyang, Liaoning 11

Patentee after: Northeastern University

Patentee after: Liaoning Xindu gold Co., Ltd

Address before: 110819 No. 3 lane, Heping Road, Heping District, Shenyang, Liaoning 11

Patentee before: Northeastern University