CN111850289A - Method for harmless treatment of wet-process zinc smelting slag through low-energy curing - Google Patents
Method for harmless treatment of wet-process zinc smelting slag through low-energy curing Download PDFInfo
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- CN111850289A CN111850289A CN202010734734.8A CN202010734734A CN111850289A CN 111850289 A CN111850289 A CN 111850289A CN 202010734734 A CN202010734734 A CN 202010734734A CN 111850289 A CN111850289 A CN 111850289A
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- wet
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- process zinc
- calcining
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/144—Slags from the production of specific metals other than iron or of specific alloys, e.g. ferrochrome slags
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for harmless treatment of zinc slag by a wet method through low-energy curing, which is characterized by comprising the steps of mixing, curing, calcining and magnetic separation, wherein a large amount of iron sulfide concentrate selected in the mineral separation process is utilized to recycle heat generated by burning the iron sulfide concentrate; the tailings after magnetic separation are identified as general solid wastes through toxicity sending, and can be used as raw materials of cement plants or paving materials. Fundamentally solves the difficult problem of environmental hazard of the zinc slag smelted by the wet method.
Description
Technical Field
The invention belongs to the technical field of metallurgy, further belongs to the technical field of metallurgical waste recycling, and particularly relates to a method for treating zinc hydrometallurgy residues through low-energy solidification and harmless treatment.
Background
In the world, the environment and the development become the main melody of the times, the circular economy is created, the conservation-oriented society is built, the harmony of human and nature is created, the method is a necessary way for the survival and the development of enterprises, and the social responsibility that the enterprises can not push away is also provided. In the face of the increasingly pressing dual pressures of resource crisis and environmental protection policy, the zinc hydrometallurgy process has met with unprecedented challenges. In a new 'circular economy' era, the existing wet-process zinc smelting process is recognized and reformed by means of 'thinking innovation', 'management innovation', 'technical innovation' and the like, the advantages of wet-process metallurgy are fully exploited, energy conservation and emission reduction are achieved, environmental safety and resource safety are ensured, and the method is a practical problem in the wet-process zinc smelting industry and also a problem about existence and development of the wet-process zinc smelting process.
Disclosure of Invention
The invention aims to provide a method for harmless treatment of wet-process zinc smelting slag through low-energy curing.
The invention aims to realize the method for harmlessly treating the zinc-making slag by the wet method through low-energy curing, which comprises the steps of mixing, curing, calcining and magnetically separating, and specifically comprises the following steps:
A. mixing materials: adding iron sulfide concentrate into the wet-process zinc-smelting slag to be treated, and uniformly mixing to obtain a mixture a;
B. and (3) curing: adding a curing agent into the mixture a, and uniformly mixing to obtain a material b;
C. and (3) calcining: calcining the material b in an oxidizing atmosphere to obtain a material c;
D. magnetic separation: magnetically separating the material c to obtain magnetic iron d and tailings e, wherein the magnetic iron can be directly sold as a product; the tailings e can be used as raw materials of cement plants or paving materials.
The method comprises the following steps of (1) generating a large amount of leaching slag in the process of zinc hydrometallurgy, wherein the leaching slag belongs to hazardous waste, if the leaching slag is not treated, the leaching slag can cause large environmental protection pressure to enterprises, but if the leaching slag is directly roasted at high temperature, high energy consumption and equipment investment can cause economic pressure to the enterprises, the heat generated by combustion of the iron sulfide concentrate is recycled by utilizing a large amount of iron sulfide concentrate selected in the ore dressing process, the iron sulfide concentrate can be converted into iron oxide while roasting and solidifying the leaching slag, the iron oxide concentrate is sold after magnetic separation, and sulfur dioxide generated in the roasting process can be used for preparing acid and returns to a front-end leaching process; the tailings after magnetic separation are identified as general solid wastes through toxicity sending, and can be used as raw materials of cement plants or paving materials. Fundamentally solves the difficult problem of environmental hazard of the zinc slag smelted by the wet method.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
The method for harmless treatment of wet-process zinc smelting slag through low-energy curing comprises the steps of mixing, curing, calcining and magnetic separation, and specifically comprises the following steps:
A. mixing materials: adding iron sulfide concentrate into the wet-process zinc-smelting slag to be treated, and uniformly mixing to obtain a mixture a;
B. and (3) curing: adding a curing agent into the mixture a, and uniformly mixing to obtain a material b;
C. and (3) calcining: calcining the material b in an oxidizing atmosphere to obtain a material c;
D. magnetic separation: magnetically separating the material c to obtain magnetic iron d and tailings e, wherein the magnetic iron can be directly sold as a product; the tailings e can be used as raw materials of cement plants or paving materials.
And the adding amount of the iron sulfide concentrate in the step A is 20-80% of the mass percentage of the zinc hydrometallurgy slag.
And the curing agent in the step B is one or more of fly ash, quicklime, sodium salt, calcium salt and phosphate.
The addition amount of the curing agent is 3-30% of the mass percentage of the material a.
And C, calcining at 700-1000 ℃.
The calcining time is 0.5-5 h.
The invention is further illustrated by the following specific examples:
example 1
(1) Uniformly mixing 1000g of zinc hydrometallurgy leaching slag and 400g of iron sulfide concentrate in a mixer, and adding 100g of mixed curing agent of calcium dihydrogen phosphate and quicklime, wherein the mass ratio of the calcium dihydrogen phosphate to the quicklime is 1: 1;
(2) roasting the obtained mixture for 3h at 900 ℃ in an oxidizing atmosphere to obtain a roasted material;
(3) carrying out low-intensity magnetic separation on the obtained roasted material to obtain magnetite with the iron grade of 61.5%;
(4) and (3) carrying out toxicity identification on tailings obtained by magnetic separation, wherein the tailings are general solid wastes and can be used as raw materials of cement plants or paving materials.
Example 2
(1) Uniformly mixing 1000g of zinc hydrometallurgy leaching slag and 200g of iron sulfide concentrate in a mixer, and adding 40g of fly ash curing agent;
(2) roasting the obtained mixture for 5 hours at 700 ℃ in an oxidizing atmosphere to obtain a roasted material;
(3) carrying out low-intensity magnetic separation on the obtained roasted material to obtain magnetite with the iron grade of 58.9%;
(4) and (3) carrying out toxicity identification on tailings obtained by magnetic separation, wherein the tailings are general solid wastes and can be used as raw materials of cement plants or paving materials.
Example 3
(1) Uniformly mixing 1000g of zinc hydrometallurgy leaching slag and 800g of iron sulfide concentrate in a mixer, and adding 600g of quick lime curing agent;
(2) roasting the obtained mixture for 0.5h at 1000 ℃ in an oxidizing atmosphere to obtain a roasted material;
(3) carrying out low-intensity magnetic separation on the obtained roasted material to obtain magnetite with iron grade of 63.2%;
(4) and (3) carrying out toxicity identification on tailings obtained by magnetic separation, wherein the tailings are general solid wastes and can be used as raw materials of cement plants or paving materials.
Example 4
(1) Uniformly mixing 1000g of zinc hydrometallurgy leaching slag and 500g of iron sulfide concentrate in a mixer, and adding 150g of a mixed curing agent of fly ash and quicklime, wherein the mass ratio of the fly ash to the quicklime is 1: 1;
(2) roasting the obtained mixture for 4 hours at 800 ℃ in an oxidizing atmosphere to obtain a roasted material;
(3) carrying out low-intensity magnetic separation on the obtained roasted material to obtain magnetite with the iron grade of 65.1%;
(4) and (3) carrying out toxicity identification on tailings obtained by magnetic separation, wherein the tailings are general solid wastes and can be used as raw materials of cement plants or paving materials.
Example 5
(1) Uniformly mixing 1000g of zinc hydrometallurgy leaching slag and 480g of iron sulfide concentrate in a mixer, and adding 500g of monocalcium phosphate curing agent;
(2) roasting the obtained mixture for 2 hours at 950 ℃ in an oxidizing atmosphere to obtain a roasted material;
(3) carrying out low-intensity magnetic separation on the obtained roasted material to obtain magnetite with the iron grade of 62.8%;
(4) and (3) carrying out toxicity identification on tailings obtained by magnetic separation, wherein the tailings are general solid wastes and can be used as raw materials of cement plants or paving materials.
Example 6
(1) Uniformly mixing 1000g of zinc hydrometallurgy leaching slag and 740g of iron sulfide concentrate in a mixer, and adding 400g of sodium carbonate curing agent;
(2) roasting the obtained mixture for 4 hours at 780 ℃ in an oxidizing atmosphere to obtain a roasted material;
(3) carrying out low-intensity magnetic separation on the obtained roasted material to obtain magnetite with the iron grade of 62.9%;
(4) and (3) carrying out toxicity identification on tailings obtained by magnetic separation, wherein the tailings are general solid wastes and can be used as raw materials of cement plants or paving materials.
Example 7
(1) Uniformly mixing 1000g of zinc hydrometallurgy leaching slag and 500g of iron sulfide concentrate in a mixer, and adding 300g of a mixed curing agent of calcium dihydrogen phosphate and sodium phosphate, wherein the mass ratio of the calcium dihydrogen phosphate to the sodium phosphate is 1: 1;
(2) roasting the obtained mixture for 4 hours at 850 ℃ in an oxidizing atmosphere to obtain a roasted material;
(3) carrying out low-intensity magnetic separation on the obtained roasted material to obtain magnetite with the iron grade of 64.8%;
(4) and (3) carrying out toxicity identification on tailings obtained by magnetic separation, wherein the tailings are general solid wastes and can be used as raw materials of cement plants or paving materials.
Claims (6)
1. The method for harmless treatment of the zinc slag by the wet method through low-energy curing is characterized by comprising the steps of mixing, curing, calcining and magnetic separation, and specifically comprises the following steps:
A. mixing materials: adding iron sulfide concentrate into the wet-process zinc-smelting slag to be treated, and uniformly mixing to obtain a mixture a;
B. and (3) curing: adding a curing agent into the mixture a, and uniformly mixing to obtain a material b;
C. and (3) calcining: calcining the material b in an oxidizing atmosphere to obtain a material c;
D. magnetic separation: magnetically separating the material c to obtain magnetic iron d and tailings e, wherein the magnetic iron can be directly sold as a product; the tailings e can be used as raw materials of cement plants or paving materials.
2. The method for harmless low-energy curing of wet-process zinc slag according to claim 1, wherein the addition amount of the iron sulfide concentrate in the step A is 20-80% of the mass percent of the wet-process zinc slag.
3. The method for low-energy curing harmless treatment of wet-process zinc smelting slag according to claim 1, wherein the curing agent in the step B is one or more of fly ash, quicklime, sodium salt, calcium salt and phosphate.
4. The method for harmless low-energy curing of wet-process zinc slag according to claim 1 or 3, wherein the addition amount of the curing agent is 3-30% of the mass percent of the material a.
5. The method for harmless low-energy curing of wet-process zinc slag according to claim 1, wherein the calcining temperature in the step C is 700-1000 ℃.
6. The low-energy-curing harmless wet-process zinc slag treatment method according to claim 1 or 5, wherein the calcining time is 0.5-5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010734734.8A CN111850289B (en) | 2020-07-28 | 2020-07-28 | Method for harmlessly treating wet-process zinc smelting slag through low-energy curing |
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| CN202010734734.8A CN111850289B (en) | 2020-07-28 | 2020-07-28 | Method for harmlessly treating wet-process zinc smelting slag through low-energy curing |
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| CN111850289A true CN111850289A (en) | 2020-10-30 |
| CN111850289B CN111850289B (en) | 2022-05-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113546754A (en) * | 2021-07-23 | 2021-10-26 | 昆明冶金研究院有限公司 | Process for comprehensively utilizing oxygen-sulfur mixed lead-zinc ore |
Citations (6)
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| US20120132032A1 (en) * | 2010-11-29 | 2012-05-31 | Basf Corporation | Magnetic recovery of valuables from slag material |
| CN105618254A (en) * | 2015-12-22 | 2016-06-01 | 深圳市中金岭南有色金属股份有限公司 | Roasting and magnetic separation processing technology for lead-zinc tailings |
| CN107149979A (en) * | 2017-06-13 | 2017-09-12 | 汉源县伟业商贸有限公司 | A kind of method that iron is reclaimed in the revolution kiln slag from zinc hydrometallurgy |
| CN107159442A (en) * | 2017-06-13 | 2017-09-15 | 汉源县伟业商贸有限公司 | A kind of method that coal and cement raw material are reclaimed in the revolution kiln slag from zinc hydrometallurgy |
| CN110029232A (en) * | 2019-04-30 | 2019-07-19 | 云南驰宏锌锗股份有限公司 | A kind of method of low-grade lead Zinc oxide resource utilization |
| CN110983061A (en) * | 2019-11-29 | 2020-04-10 | 中南大学 | Method for cooperative recycling of lead-zinc smelting slag and jarosite slag |
-
2020
- 2020-07-28 CN CN202010734734.8A patent/CN111850289B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120132032A1 (en) * | 2010-11-29 | 2012-05-31 | Basf Corporation | Magnetic recovery of valuables from slag material |
| CN105618254A (en) * | 2015-12-22 | 2016-06-01 | 深圳市中金岭南有色金属股份有限公司 | Roasting and magnetic separation processing technology for lead-zinc tailings |
| CN107149979A (en) * | 2017-06-13 | 2017-09-12 | 汉源县伟业商贸有限公司 | A kind of method that iron is reclaimed in the revolution kiln slag from zinc hydrometallurgy |
| CN107159442A (en) * | 2017-06-13 | 2017-09-15 | 汉源县伟业商贸有限公司 | A kind of method that coal and cement raw material are reclaimed in the revolution kiln slag from zinc hydrometallurgy |
| CN110029232A (en) * | 2019-04-30 | 2019-07-19 | 云南驰宏锌锗股份有限公司 | A kind of method of low-grade lead Zinc oxide resource utilization |
| CN110983061A (en) * | 2019-11-29 | 2020-04-10 | 中南大学 | Method for cooperative recycling of lead-zinc smelting slag and jarosite slag |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113546754A (en) * | 2021-07-23 | 2021-10-26 | 昆明冶金研究院有限公司 | Process for comprehensively utilizing oxygen-sulfur mixed lead-zinc ore |
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Effective date of registration: 20220321 Address after: No. 68, Wenchang Road, No. 121 street, Kunming, Yunnan 650499 Applicant after: Kunming University of Science and Technology Applicant after: Kunming Metallurgical Research Institute Co., Ltd Address before: No.86 Yuantong North Road, Wuhua District, Kunming, Yunnan 650021 Applicant before: Kunming Metallurgical Research Institute Co.,Ltd. |
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