CN104195347A - Process for enriching gold and silver from pyrite cinder and method for extracting gold and silver - Google Patents
Process for enriching gold and silver from pyrite cinder and method for extracting gold and silver Download PDFInfo
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- CN104195347A CN104195347A CN201410476304.5A CN201410476304A CN104195347A CN 104195347 A CN104195347 A CN 104195347A CN 201410476304 A CN201410476304 A CN 201410476304A CN 104195347 A CN104195347 A CN 104195347A
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Abstract
The invention relates to a process for enriching gold and silver from pyrite cinder and a method for extracting gold and silver. The method is characterized by comprising the following processing steps: adjusting the technology indexes of an acid preparing system, wherein the hearth bottom is 18 KPa-22 KPa, the hearth bottom wind is 30000 Nm<3>/h-35000 Nm<3>/h, the roasting temperature is 880-950 DEG C, and the negative pressure at an electric dust outlet is -1 KPa to -2 KPa; and collecting electric dust slag at the position of electric dust removal, and extracting the gold and the silver. The method disclosed by the invention has good economic benefits and environmental benefits, and conforms to policies on the resource utilization and clean production of process waste in China.
Description
Technical field
The present invention relates to sulfate cinder application technology as the second resource field, specifically, what relate to is gold and silver process of enriching and extract the method for gold and silver in a kind of sulfate cinder.
Background technology
Sulfate cinder refers to that with sulfurous iron ore be the slag of discharging in raw material production sulfuric acid process.Although China's acid production with sulphur output increased rapidly in recent years, pyrite-based sulfuric acid production is still the main method of China's gas washing in SA production, and sulfate cinder quantity discharged accounted for 1/3 of chemical sludge in recent years.Because pyrite cinder adopts landfill mostly, processing, not only cause serious environmental pollution, and taken a large amount of land resources, is also a kind of waste to resource.
Recent year be take Shandong and is recruited the smelting enterprise that Billion Group is representative to carry out the technical study of higher-grade pyrite-based sulfuric acid production coproduction iron fine powder, and realize industrialization, obtain certain actual effect, iron grade in sulfate cinder is reached more than 62%, can be directly as iron-smelting raw material.But the gold of the 1.5g/t left and right of containing in slag and the silver of 25g/t left and right do not extract, but sell with iron powder, do not participate in valuation, have not only affected the economic benefit of enterprise, and have caused the wasting of resources.
The sulfate cinder that existing higher-grade pyrite-based sulfuric acid production coproduction iron fine powder technology produces comprises: bottom slag, boiler slag, whirlwind slag, electric dirt slag four parts, gold and silver grade in each several part slag is more or less the same, if extract gold and silver wherein, all slags must be processed, cause industrial scale large, facility investment is high, and comprehensive benefit is low.
At present, domestic whole cyanide process and the chlorination roast method mainly taked extracted the gold and silver in sulfate cinder.The lower reason of whole cyanide process Yin Jinyin grade, causes the rate of recovery on the low side, and economic benefit is not high, and cyaniding iron fine powder is later because of containing prussiate, belongs to dangerization product, and the each side such as environmental protection, sale are greatly affected.Research shows, chlorinating roasting can obtain higher evaporation rate aspect gold and silver extraction in sulfate cinder, and comprehensively has greater advantage aspect recovery at many metals, but investment is larger.
The above-mentioned state of the art shows, extraction for gold and silver in the sulfate cinder after comprehensive utilization sulphur iron resources is the difficult problem that must solve in comprehensive utilization of resources process, its difficult point is to find the effective extracting method that is applicable to this special material, when developing skill index, simplify extraction step, reduce extraction cost, improve iron fine powder quality simultaneously, and relatively less to environmental influence.
Summary of the invention
The present invention is based on higher-grade pyrite-based sulfuric acid production coproduction iron fine powder technology, gold and silver process of enriching in a kind of sulfate cinder is provided and has extracted the method for gold and silver, for the sulfate cinder after comprehensive utilization sulphur iron resources, adopt effective enriching method, first make gold and silver wherein carry out enrichment, then utilize environmental protection to carry golden medicament and leach, after the absorption of charcoal slurry, smelt and obtain gold and silver, improve the quality of sulfate cinder simultaneously.
The present invention is achieved by the following technical solutions:
A method for gold and silver process of enriching and extraction gold and silver in sulfate cinder, its special character is, comprises following processing step:
Step 1: enrichment gold and silver
The present invention, in the situation that not affecting the normal production of acid making system, adjusts acid making system technic index: furnace bottom pressure 18KPa-22KPa, furnace bottom wind 30000Nm
3/ h--35000Nm
3880 ℃ of/h, maturing temperatures--950 ℃, electric dirt outlet negative pressure-1KPa--2KPa;
By the adjustment of above-mentioned a series of acid-making process parameters, make under the effects such as furnace bottom wind, electric field action, gravity and negative pressure system of acid making system inside, to carry out enrichment containing the higher sulfate cinder of gold and silver, form the enrichment region of gold and silver, and carry out sedimentation at electric precipitation place.When the gold and silver that extract wherein, only electric dirt slag need be processed like this, industrial scale is little, and facility investment is low, and comprehensive benefit is high.
Step 2: extract gold and silver
The sulfate cinder containing higher-grade gold and silver that step 1 is obtained carries out water logging 3-6 hour, wherein to account for the mass ratio of total amount be 30%-40% to sulfate cinder, after concentrated, filtration, washing, adding alkali sizes mixing to pH=11-13, then utilize environmental protection to carry golden medicament and leach 20-30 hour, what wherein golden medicament employing was proposed in environmental protection is the golden cicada reagent (patent No.: 201010553418.7) of being produced by Guangxi Sen He mining industry Science and Technology Ltd., the mass ratio that its addition accounts for total amount is 0.1%-0.2%, finally add gac 13-18g/L, after the absorption of charcoal slurry, smelt and obtain gold and silver.
The present invention is from the special feedstock property of sulfate cinder, from golden microfine occurrence status, start with, proposition utilizes furnace bottom wind, electric field action, gravity and the negative pressure system of acid making system self to make gold and silver in gas washing in SA production, carry out enrichment, forms the enrichment region of gold and silver.After enrichment, gold grade reaches 8g/t left and right, and silver-colored grade reaches 50g/t left and right.The sulfate cinder containing higher-grade gold and silver of this technique output is carried golden medicament through environmental protection and is leached, and after the absorption of charcoal slurry, smelts and obtains gold and silver, and iron fine powder iron grade improves, and sulphur content reduces.The leaching yield of gold reaches more than 80%, and the leaching yield of silver is more than 55%, and iron grade improves more than 4%, and sulfur-bearing is lower than 0.2%.Method economic benefit and the environmental benefit that the present invention relates to are good, meet country about the policy of technique utilization of waste as resource and cleaner production.
Accompanying drawing explanation
Fig. 1: process for extracting gold and silver schema in a kind of sulfate cinder of the present invention.
Embodiment
Referring to accompanying drawing, provide the specific embodiment of the present invention, be used for formation of the present invention to be further described.
Embodiment 1
A method for gold and silver process of enriching and extraction gold and silver in sulfate cinder, comprises following processing step:
Step 1: enrichment gold and silver
Adjust acid making system technic index: furnace bottom pressure 18KPa, furnace bottom wind 30000Nm
3/ h, 880 ℃ of maturing temperatures, electric dirt outlet negative pressure-1KPa;
Collect the electric dirt slag at electric precipitation place.
Step 2: extract gold and silver
The electric dirt slag of collecting is carried out to water logging 3 hours, the mass ratio that wherein sulfate cinder accounts for total amount is (concentration) 30%, after concentrated, filtration, washing, adding alkali sizes mixing to PH=11, then utilize environmental protection to carry golden medicament and leach 20 hours, what wherein golden medicament employing was proposed in environmental protection is the golden cicada reagent of being produced by Guangxi Sen He mining industry Science and Technology Ltd., and the mass ratio that its addition accounts for total amount is 0.1%, finally add gac 13g/L, after the absorption of charcoal slurry, smelt and obtain gold and silver.
Embodiment 2
A method for gold and silver process of enriching and extraction gold and silver in sulfate cinder, comprises following processing step:
Step 1: enrichment gold and silver
Adjust acid making system technic index: furnace bottom pressure 22KPa, furnace bottom wind 35000Nm
3/ h, 950 ℃ of roastings, electric dirt outlet negative pressure-2KPa;
Collect the electric dirt slag at electric precipitation place.
Step 2: extract gold and silver
The sulfate cinder that step 1 is obtained carries out water logging 6 hours, the mass ratio that wherein sulfate cinder accounts for total amount is (concentration) 40%, after concentrated, filtration, washing, adding alkali sizes mixing to PH=13, then utilize environmental protection to carry golden medicament and leach 30 hours, what wherein golden medicament employing was proposed in environmental protection is the golden cicada reagent of being produced by Guangxi Sen He mining industry Science and Technology Ltd., and the mass ratio that its addition accounts for total amount is 0.2%, finally add gac 18g/L, after the absorption of charcoal slurry, smelt and obtain gold and silver.
Embodiment 3
A method for gold and silver process of enriching and extraction gold and silver in sulfate cinder, comprises following processing step:
Step 1: enrichment gold and silver
Adjust acid making system technic index: furnace bottom pressure 20KPa, furnace bottom wind 32000Nm
3/ h, 920 ℃ of maturing temperatures, electric dirt outlet negative pressure-1.5KPa;
Collect the electric dirt slag at electric precipitation place.
Step 2: extract gold and silver
The sulfate cinder containing higher-grade gold and silver that step 1 is obtained carries out water logging 4.5 hours, the mass ratio that wherein sulfate cinder accounts for total amount is (concentration) 35%, after concentrated, filtration, washing, adding alkali sizes mixing to PH=12, then utilizing environmental protection to carry golden medicament leaches 25 hours, what wherein golden medicament employing was proposed in environmental protection is the golden cicada reagent of being produced by Guangxi Sen He mining industry Science and Technology Ltd., the mass ratio that its addition accounts for total amount is 0.15%, finally add gac 15g/L, after the absorption of charcoal slurry, smelt and obtain gold and silver.
Experimental example 1
Certain enterprise's sulfate cinder chemical composition is as follows:
Table 1: certain enterprise's sulfate cinder constituent content
| Element | Au(g/t) | Ag(g/t) |
| Content | 1.73 | 25.77 |
(1), in the situation that not affecting the normal production of acid making system, adjust acid making system furnace bottom pressure 20KPa, furnace bottom wind 33000Nm
3/ h, 900 ℃ of maturing temperatures, electric dirt outlet negative pressure-1.5KPa, make containing the higher slag of gold and silver, under the effects such as wind, electric field action, gravity and negative pressure system at the bottom of acid making system inner furnace, to carry out enrichment, forms golden enrichment region, and carry out sedimentation at electric precipitation place.After enrichment, sulfate cinder chemical composition is as follows:
Table 2: sulfate cinder constituent content after certain enterprise's enrichment
| Element | Au(g/t) | Ag(g/t) | Fe(％) | Effective S (%) |
| Content | 7.88 | 46.92 | 58.56 | 1.75 |
(2) the above-mentioned sulfate cinder containing higher-grade gold and silver is carried out to water logging 4h, after concentrated, filtration, washing, add alkali and size mixing to PH=12, then utilize environmental protection to carry golden medicament and leach 24h, the rear smelting of charcoal slurry absorption obtains gold and silver.Sulfate cinder, after concentrating, dewatering, becomes iron-smelting raw material.Technical target of the product is as follows:
Table 3: certain enterprise extracts gold and silver technical indicator
| Element | Au leaching yield (%) | Ag leaching yield (%) | Fe(％) | Effective S (%) |
| Content | 80.8 | 57.3 | 62.55 | 0.12 |
Utilize the present invention, certain enterprise extracts gold and silver from sulfate cinder, has increased economic benefit, has improved resource utilization.
Experimental example 2
Certain enterprise's sulfate cinder chemical composition is as follows:
Table 1: certain enterprise's sulfate cinder constituent content
| Element | Au(g/t) | Ag(g/t) |
| Content | 1.95 | 30.2 |
(1), in the situation that not affecting the normal production of acid making system, adjust acid making system furnace bottom pressure 20.5KPa, furnace bottom wind 33500Nm
3/ h, 920 ℃ of maturing temperatures, electric dirt outlet negative pressure-1.8KPa, make containing the higher slag of gold and silver, under the effects such as wind, electric field action, gravity and negative pressure system at the bottom of acid making system inner furnace, to carry out enrichment, forms golden enrichment region, and carry out sedimentation at electric precipitation place.After enrichment, sulfate cinder chemical composition is as follows:
Table 2: sulfate cinder constituent content after certain enterprise's enrichment
| Element | Au(g/t) | Ag(g/t) | Fe(％) | Effective S (%) |
| Content | 8.3 | 48.2 | 59.7 | 1.65 |
(2) the above-mentioned sulfate cinder containing higher-grade gold and silver is carried out to water logging 5h, after concentrated, filtration, washing, add alkali and size mixing to PH=11.5, then utilize environmental protection to carry golden medicament and leach 24h, the rear smelting of charcoal slurry absorption obtains gold and silver.Sulfate cinder, after concentrating, dewatering, becomes iron-smelting raw material.Technical target of the product is as follows:
Table 3: certain enterprise extracts gold and silver technical indicator
Utilize the present invention, certain enterprise extracts gold and silver from sulfate cinder, has increased economic benefit, has improved resource utilization.
Claims (2)
1. a method for gold and silver process of enriching and extraction gold and silver in sulfate cinder, is characterized in that, comprises following processing step:
Adjust acid making system technic index: furnace bottom pressure 18KPa-22KPa, furnace bottom wind 30000Nm
3/ h--35000Nm
3880 ℃ of/h, maturing temperatures--950 ℃, electric dirt outlet negative pressure-1KPa--2KPa; The electric dirt slag of collecting electric precipitation place extracts gold and silver.
2. gold and silver process of enriching and extract the method for gold and silver in a kind of sulfate cinder as claimed in claim 1, is characterized in that, the specific embodiment of extracting gold and silver is as follows:
Sulfate cinder is carried out water logging 3-6 hour, wherein to account for the mass ratio of total amount be 30%-40% to sulfate cinder, after concentrated, filtration, washing, adding alkali sizes mixing to PH=11-13, then utilize environmental protection to carry golden medicament and leach 20-30 hour, what wherein golden medicament employing was proposed in environmental protection is the golden cicada reagent of being produced by Guangxi Sen He mining industry Science and Technology Ltd., and the mass ratio that its addition accounts for total amount is 0.1%-0.2%, finally add gac 13-18g/L, after the absorption of charcoal slurry, smelt and obtain gold and silver.
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| CN201410476304.5A CN104195347B (en) | 2014-09-17 | 2014-09-17 | A kind of method of gold and silver process of enriching and extraction gold and silver in sulfate cinder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112322907A (en) * | 2020-11-09 | 2021-02-05 | 紫金矿业集团股份有限公司 | Method for settling cyanided ore pulp of pyrite cinder |
| CN113122714A (en) * | 2019-12-31 | 2021-07-16 | 辽宁省国望技术服务有限公司 | Biological heap leaching gold extraction method for low-grade gold ore |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990013678A1 (en) * | 1989-05-08 | 1990-11-15 | Farber Mark I | Process and apparatus for the recovery of precious metals from slag, tailings and other materials |
| DE19805893A1 (en) * | 1998-02-13 | 1999-08-19 | Wiener | Precious metal especially gold recovery from slags and melting furnace residues |
| CN102560126A (en) * | 2012-02-27 | 2012-07-11 | 中南大学 | Method for extracting gold and/or silver from sulfuric acid slag |
-
2014
- 2014-09-17 CN CN201410476304.5A patent/CN104195347B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990013678A1 (en) * | 1989-05-08 | 1990-11-15 | Farber Mark I | Process and apparatus for the recovery of precious metals from slag, tailings and other materials |
| DE19805893A1 (en) * | 1998-02-13 | 1999-08-19 | Wiener | Precious metal especially gold recovery from slags and melting furnace residues |
| CN102560126A (en) * | 2012-02-27 | 2012-07-11 | 中南大学 | Method for extracting gold and/or silver from sulfuric acid slag |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113122714A (en) * | 2019-12-31 | 2021-07-16 | 辽宁省国望技术服务有限公司 | Biological heap leaching gold extraction method for low-grade gold ore |
| CN112322907A (en) * | 2020-11-09 | 2021-02-05 | 紫金矿业集团股份有限公司 | Method for settling cyanided ore pulp of pyrite cinder |
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| CN104195347B (en) | 2015-12-30 |
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Effective date of registration: 20180627 Address after: 265406 Shandong, Yantai, Zhaoyuan, Zhang Xing Town, North Village East Patentee after: Zhao Jinjinhe Science and Technology Ltd. of Zhaoyuan City Address before: 265406 Pan Jia Ji Dong Linglong Town, Zhaoyuan City, Yantai, Shandong Patentee before: ZHAOYUAN CITY ZHAOJIN GUIHE TECHNICAL CO., LTD. |
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