CN103966421A - Comprehensive recovery method of ferrous metallurgical solid wastes - Google Patents
Comprehensive recovery method of ferrous metallurgical solid wastes Download PDFInfo
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- CN103966421A CN103966421A CN201410162981.XA CN201410162981A CN103966421A CN 103966421 A CN103966421 A CN 103966421A CN 201410162981 A CN201410162981 A CN 201410162981A CN 103966421 A CN103966421 A CN 103966421A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a comprehensive recovery method of ferrous metallurgical solid wastes. The method adopts the technical scheme that the following steps are included: firstly, the ferrous metallurgical solid wastes are washed with water to immerse KCI in the leaching solution; KCI is extracted through crystallization and purification; high-intensity magnetic separation and low-intensity magnetic separation are performed on the washing residue to obtain powered iron; the mixture of mineral tailings of magnetic separation and a reducing agent are roasted, so that zinc in the solid wastes is reduced and volatilized, and the reduced and volatilized zinc enters into fume; metallic zinc is obtained through leaching, refinement, electro-deposition of the fume containing zinc; the direct reduced iron is obtained through the low-intensity magnetic separation of the roasting residue. With the adoption of the comprehensive recovery method of the ferrous metallurgical solid wastes, elements such as Fe, C and the like in the solid wastes can be effectively recycled and reutilized, and non-ferrous metals like K and Zn in the solid wastes can be extracted, so that the comprehensive utilization of the metallurgical solid wastes is facilitated.
Description
Technical field
The present invention relates to Using Metallurgical Solid Wastes comprehensive reutilization technical field, be specifically related to a kind of method of ferrous metallurgy solid waste comprehensive reutilization.
Background technology
When developing rapidly along with China Steel industry, the metallurgical solid wastes such as its byproduct blast furnace dust, sintering electro-precipitating dust, the front ash of iron-smelting furnace, steel-smelting sewage sludge also increase year by year.But these solid waste, due to complicated component, the reason such as granularity is tiny, moisture content fluctuation is large, are utilized comparatively difficulty.In addition, these are incorporated into as " poisonous solid waste " containing ferrous metallurgy solid waste of zinc, require zinc wherein etc. to reclaim or Passivation Treatment, otherwise must sealing stack.Therefore, for iron and steel enterprise, how really accomplishing economy, rationally, efficiently, synthetically utilize these a considerable number of iron-containing resources, is urgent problem.
In order to effectively utilize dust resource, eliminate environmental pollution, reduce harm to human body, realize the environmental requirement of Iron and Steel Production zero release, the iron and steel enterprise of various countries is all explored making great efforts, the method for seeking effectively to process metallurgical solid waste.The treatment process of Steel Plant's solid waste is a lot, can be divided into: pyrogenic process, wet method, pyrogenic process and wet method combined facture, solidify or vitreous method and select smelting facture.But these methods are faced with equally, and technical process complexity, energy consumption and raw materials consumption are high, metal recovery rate is unstable, running cost is high, have the shortcomings such as certain secondary pollution.Given this it is very necessary, seeking a kind of method that these waste comprehensive high-efficiencies are recycled.
Summary of the invention
The object of the present invention is to provide a kind of method of ferrous metallurgy solid waste comprehensive reutilization, solve ferrous metallurgy solid waste and cannot effectively utilize the caused problem such as the wasting of resources, contaminate environment.
For achieving the above object, the technical solution used in the present invention is:
A method for ferrous metallurgy solid waste comprehensive reutilization, it specifically comprises the steps:
Operation is leached in step 1 washing
By the washing of ferrous metallurgy solid waste, KCl is immersed in solution, obtain KCl leach liquor and leached mud;
KCl is extracted in step 2 crystallization
The leach liquor that step 1 is obtained carries out removal of impurities and according to the variation crystallization and purification of solubleness, extracts KCl;
Step 3 magnetic separation obtains iron fine powder
The leached mud that step 1 is obtained carries out high intensity magnetic separation and low intensity magnetic separation, obtains the mine tailing after iron fine powder and magnetic separation;
Step 4 roasting obtains reduced iron
Baking mixed under the condition that the mine tailing obtaining to step 3 is 0.8-1.0 at C/O ratio, obtain zinc smoke and roasting residue, roasting residue is carried out to magnetic separation obtain direct-reduced iron;
Step 5 obtains metallic zinc
To the zinc smoke obtaining in step 4, by leaching, purification and electrodeposition, obtain metallic zinc.
Further improve as the present invention, described step 1 is specially: ferrous metallurgy solid waste is worn into-100 powder, in 70-80 DEG C of water, leached, its liquid-solid ratio is controlled at 2-4:1, mixing speed 100-500 r/min, churning time 10-30min, is immersed in solution KCl.
Further improve as the present invention, described step 2 is specially: the leach liquor to KCl adds Na
2s and K
2sO
4, remove the impurity in leach liquor, then carry out evaporation concentration and crystallization and extract KCl.
Further improve as the present invention, the intensity of described step 3 medium-high magnetic field is 8000-15000 Gauss, and the intensity of low-intensity magnetic field is 2000 Gausses.
Further improve as the present invention, in described step 4, the moisture controlled of mine tailing is in 10%, and C/O is controlled at 0.8-1.0.
Further improve as the present invention, the control method of described C/O is as follows: in the time that C/O is less than 0.8, add partial reduction agent; C/O is greater than at 1.0 o'clock, adds part powdered iron ore.
Further improve as the present invention, the maturing temperature of described step 4 is 1200 DEG C, and roasting time is controlled at 20-30min, and after roast, residue granularity is milled to 100 orders, carries out magnetic separation obtain direct-reduced iron with 2000 gauss magnetic fields.
Further improve as the present invention, described step 5 is specially: the leach liquor of zinc smoke is sulfuric acid 120-180g/L, and temperature is 60-70 DEG C, liquid-solid ratio is 13-14:1, mixing speed 100-500 r/min, sour pH value is controlled between 5-5.4 eventually, adds Zn powder and Ag
2sO
4removal of impurities, and do anode with the silver alloys of lead-argentiferous 1%, aluminium sheet does negative electrode and carries out electrodeposition, obtains metallic zinc.
Compared with prior art, the beneficial effect that the present invention obtains is:
The present invention is based on theoretical basis and the practical experience of ferrous metallurgy solid waste aspect, the KCl purity that the method for the ferrous metallurgy solid waste comprehensive reutilization providing obtains is more than 92%, the iron grade of iron ore concentrate is more than 57%, the purity of metallic zinc is more than 97%, and in direct-reduced iron, metal Ferrum content is more than 94%; The comprehensive recovery of K, Zn and iron is respectively more than 90%, 96% and 91%.Present method not only can be recycled the element such as Fe, C in solid waste effectively, and the non-ferrous metal such as K, Zn in solid waste can be extracted, for comprehensive utilization and the renewable resources of metallurgical solid waste provide new means, obtain good economic and social benefit.
Brief description of the drawings
Fig. 1 is ferrous metallurgy solid waste comprehensive reutilization process flow sheet.
Embodiment
Below in conjunction with accompanying drawing 1 and specific embodiment, the present invention is described in more detail.
Embodiment 1
Table 1 is the mixed compositions of ferrous metallurgy solid waste (content is mass percent) such as blast furnace dust, sintering dust separation ash, the front ash of iron-smelting furnace.
Table 1
| TFe | K | Na | Pb | Zn | C | Cl- |
| 38.32 | 5.51 | 0.78 | 0.38 | 10.52 | 10.14 | 6.58 |
As shown in Figure 1, the method for ferrous metallurgy solid waste comprehensive reutilization is specific as follows:
(1) ferrous metallurgy solid waste is worn into 100 powder, in 70-80 DEG C of water, leached, its liquid-solid ratio (solid-liquid mass ratio) is controlled at 2-4:1, mixing speed 100-500 r/min, and churning time 10-30min, is immersed in solution KCl.
(2) in the leach liquor of KCl, add Na
2s and K
2sO
4, remove the impurity in leach liquor, then under being the condition of 95 DEG C, temperature carries out evaporation concentration and KCl is extracted in crystallization.
(3) leached mud producing in above-mentioned steps carries out high intensity magnetic separation under 8000-15000 Gauss's magneticstrength, then under 2000 Gausses' magneticstrength, carries out low intensity magnetic separation, obtains iron fine powder.
(4) after magnetic separation, the moisture controlled of mine tailing is in 10%, and C/O is controlled at 0.8-1.0.C/O is less than at 0.8 o'clock, adds partial reduction agent; C/O is greater than at 1.0 o'clock, adds part powdered iron ore.
(5) at 1200 DEG C, the mixture of mine tailing and reductive agent is carried out to roasting, roasting time is controlled at 20-30min, and after roast, residue granularity is milled to-100 orders, carries out magnetic separation obtain direct-reduced iron with 2000 gauss magnetic fields.
(6) to the zinc smoke obtaining after roast leach, purification and electrodeposition, obtain metallic zinc.The leach liquor of zinc smoke is sulfuric acid 120-180g/L, and temperature is 60-70 DEG C, and liquid-solid ratio is (13-14): 1, and mixing speed 100-500 r/min, sour pH value is controlled between 5-5.4 eventually, adds Zn powder and Ag
2sO
4removal of impurities, and do anode with lead-silver alloys (argentiferous 1%), aluminium sheet does negative electrode and carries out electrodeposition.
This ferrous metallurgy solid waste, after method of the present invention is processed, obtain purity and be 94.21% KCl, and the rate of recovery of K is 91.46%; Obtain purity and be 97.18% metallic zinc, the rate of recovery of zinc is 96.72%; Obtain grade and be the direct-reduced iron that 57.24% iron fine powder and metal Ferrum content are 94.53%, the comprehensive recovery of iron is 91.32%.
The above embodiment is only the preferred embodiments of the present invention, and is not the exhaustive of the feasible enforcement of the present invention.For persons skilled in the art, any apparent change of under the prerequisite that does not deviate from the principle of the invention and spirit, it having been done, within all should being contemplated as falling with claim protection domain of the present invention.
Claims (8)
1. a method for ferrous metallurgy solid waste comprehensive reutilization, is characterized in that: it specifically comprises the steps:
Operation is leached in step 1 washing
By the washing of ferrous metallurgy solid waste, KCl is immersed in solution, obtain leach liquor and the leached mud of KCl;
KCl is extracted in step 2 crystallization
The leach liquor that step 1 is obtained carries out removal of impurities, then carries out condensing crystal purification, extracts KCl;
Step 3 magnetic separation obtains iron fine powder
The leached mud that step 1 is obtained carries out high intensity magnetic separation and low intensity magnetic separation, obtains the mine tailing after iron fine powder and magnetic separation;
Step 4 roasting obtains reduced iron
Under the condition that the mine tailing obtaining to step 3 is 0.8-1.0 at C/O, carry out roasting, obtain zinc smoke and roasting residue, roasting residue is carried out to magnetic separation and obtain direct-reduced iron;
Step 5 obtains metallic zinc
To the zinc smoke obtaining in step 4, by leaching, purification and electrodeposition, obtain metallic zinc.
2. the method for a kind of ferrous metallurgy solid waste comprehensive reutilization according to claim 1, it is characterized in that: described step 1 is specially: ferrous metallurgy solid waste is worn into 100 object powder, in 70-80 DEG C of water, leach, its liquid-solid ratio is controlled at 2-4:1, mixing speed 100-500 r/min, churning time 10-30min, is immersed in solution KCl.
3. the method for a kind of ferrous metallurgy solid waste comprehensive reutilization according to claim 1, is characterized in that: described step 2 is specially: the leach liquor to KCl adds Na
2s and K
2sO
4, remove the impurity in leach liquor, then carry out evaporation concentration and crystallization and extract KCl.
4. the method for a kind of ferrous metallurgy solid waste comprehensive reutilization according to claim 1, is characterized in that: the intensity of described step 3 medium-high magnetic field is 8000-15000 Gauss, and the intensity of low-intensity magnetic field is 2000 Gausses.
5. the method for a kind of ferrous metallurgy solid waste comprehensive reutilization according to claim 1, is characterized in that: in described step 4, the moisture controlled of mine tailing is in 10%, and C/O is controlled at 0.8-1.0.
6. the method for a kind of ferrous metallurgy solid waste comprehensive reutilization according to claim 5, is characterized in that: the control method of described C/O is as follows: in the time that C/O is less than 0.8, add partial reduction agent; C/O is greater than at 1.0 o'clock, adds part powdered iron ore.
7. the method for a kind of ferrous metallurgy solid waste comprehensive reutilization according to claim 1, it is characterized in that: the maturing temperature of described step 4 is 1200 DEG C, roasting time is controlled at 20-30min, after roast, residue granularity is milled to 100 orders, carries out magnetic separation obtain direct-reduced iron with 2000 gauss magnetic fields.
8. the method for a kind of ferrous metallurgy solid waste comprehensive reutilization according to claim 1, it is characterized in that: described step 5 is specially: the leaching solvent of zinc smoke is sulfuric acid 120-180g/L, temperature is 60-70 DEG C, liquid-solid ratio is 13-14:1, mixing speed 100-500 r/min, sour pH value is controlled between 5-5.4 eventually, adds Zn powder and Ag
2sO
4removal of impurities, and do anode with the silver alloys of lead-argentiferous 1%, aluminium sheet does negative electrode and carries out electrodeposition, obtains metallic zinc.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106999947A (en) * | 2015-09-18 | 2017-08-01 | 纽约市哥伦比亚大学理事会 | Method and system for reclaiming product from steel slag |
| CN107326189A (en) * | 2017-07-03 | 2017-11-07 | 江苏省冶金设计院有限公司 | A kind of system and method for handling utilising zinc containing waste residue |
| CN107523691A (en) * | 2017-07-27 | 2017-12-29 | 重庆科技学院 | A kind of method that valuable metal is extracted from industrial produced wastes |
| CN107716105A (en) * | 2017-09-28 | 2018-02-23 | 宝鸡市铭坤有色金属有限公司 | The extracting method of non-ferrous metal in a kind of waste and old circuit board |
| CN107739834A (en) * | 2017-11-21 | 2018-02-27 | 江苏省冶金设计院有限公司 | The method of processing sintering ash |
| CN110066898A (en) * | 2019-05-24 | 2019-07-30 | 关宇 | A kind of process of blast furnace separation solid waste containing zinc |
| CN110564970A (en) * | 2019-10-21 | 2019-12-13 | 中冶节能环保有限责任公司 | Process method for recovering potassium, sodium and zinc from blast furnace cloth bag ash |
| CN111394581A (en) * | 2020-04-30 | 2020-07-10 | 舒新前 | Method for removing harmful components in iron-containing solid waste |
| CN113173604A (en) * | 2020-08-05 | 2021-07-27 | 河南济源钢铁(集团)有限公司 | Method for preparing nano iron and oxide thereof by taking sintering ash as raw material |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106999947B (en) * | 2015-09-18 | 2019-09-03 | 纽约市哥伦比亚大学理事会 | For the method and system from steel slag recycling product |
| CN106999947A (en) * | 2015-09-18 | 2017-08-01 | 纽约市哥伦比亚大学理事会 | Method and system for reclaiming product from steel slag |
| CN105618254B (en) * | 2015-12-22 | 2017-08-04 | 深圳市中金岭南有色金属股份有限公司 | A kind of Pb-Zn tailings calcining magnetic separation handling process |
| 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 |
| CN107326189A (en) * | 2017-07-03 | 2017-11-07 | 江苏省冶金设计院有限公司 | A kind of system and method for handling utilising zinc containing waste residue |
| CN107523691B (en) * | 2017-07-27 | 2019-04-05 | 重庆科技学院 | A method of extracting valuable metal from industrial produced wastes |
| CN107523691A (en) * | 2017-07-27 | 2017-12-29 | 重庆科技学院 | A kind of method that valuable metal is extracted from industrial produced wastes |
| CN107716105A (en) * | 2017-09-28 | 2018-02-23 | 宝鸡市铭坤有色金属有限公司 | The extracting method of non-ferrous metal in a kind of waste and old circuit board |
| CN107739834A (en) * | 2017-11-21 | 2018-02-27 | 江苏省冶金设计院有限公司 | The method of processing sintering ash |
| CN110066898A (en) * | 2019-05-24 | 2019-07-30 | 关宇 | A kind of process of blast furnace separation solid waste containing zinc |
| CN110564970A (en) * | 2019-10-21 | 2019-12-13 | 中冶节能环保有限责任公司 | Process method for recovering potassium, sodium and zinc from blast furnace cloth bag ash |
| CN111394581A (en) * | 2020-04-30 | 2020-07-10 | 舒新前 | Method for removing harmful components in iron-containing solid waste |
| CN113173604A (en) * | 2020-08-05 | 2021-07-27 | 河南济源钢铁(集团)有限公司 | Method for preparing nano iron and oxide thereof by taking sintering ash as raw material |
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Application publication date: 20140806 |