CN112226615A - Comprehensive utilization method of stainless steel solid waste - Google Patents
Comprehensive utilization method of stainless steel solid waste Download PDFInfo
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- CN112226615A CN112226615A CN202011099935.1A CN202011099935A CN112226615A CN 112226615 A CN112226615 A CN 112226615A CN 202011099935 A CN202011099935 A CN 202011099935A CN 112226615 A CN112226615 A CN 112226615A
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- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
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- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
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- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/216—Sintering; Agglomerating in rotary furnaces
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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Abstract
The invention discloses a comprehensive utilization method of stainless steel solid waste, which comprises the following steps: (1) pretreating the raw materials; (2) uniformly mixing acid-washed sludge, dedusting ash, iron scale, chromite, a binder and a reducing agent according to a set proportion, and pelletizing; (3) putting the green pellets into a chain grate machine, and drying and oxidizing and preheating at a preset wind speed and temperature; (4) mixing the preheated pellets with a reducing agent, putting the mixture into a rotary kiln, and carrying out pre-reduction at 1150-1300 ℃; (5) mixing the pre-reduced pellets, a reducing agent and a melting additive, and adding the mixture into a smelting furnace or an electric furnace for smelting to obtain the pig iron. The method provided by the invention takes the acid-washing sludge, the dedusting ash and the iron scale as the pellet raw materials, utilizes the coal-based direct reduction-melting process and is matched with chromite to produce the metalized pellet containing the chromium dust mud with excellent metallization rate and strength, and effectively recovers valuable elements of iron, chromium and nickel in the stainless steel solid waste.
Description
Technical Field
The invention belongs to the technical field of metallurgy and mineral engineering, and particularly relates to a comprehensive utilization method of stainless steel solid waste.
Background
Stainless steel solid waste (dedusting ash, pickling sludge and iron scale) is solid waste generated in the production and processing process of stainless steel, the yield of stainless steel in China is increased year by year in recent years, the accumulation amount of the stainless steel solid waste is increased more and more, because dust and sludge (dedusting ash and pickling sludge) of a stainless steel factory contain a large amount of harmful elements such as lead, zinc, chromium, alkali metal and the like, and a large amount of sulfides and fluorides, especially hexavalent chromium, because the compound has high solubility in water and is a carcinogen, the compound can seriously harm the health of human bodies, cause environmental pollution and can destroy the ecological balance, and the rational utilization of the stainless steel solid waste is related to the healthy development of stainless steel enterprises in China, and becomes one of the focuses of wide social attention.
At present, the treatment of stainless steel factory dust and sludge (fly ash and acid washing sludge) at home and abroad can be divided into resource treatment and non-resource treatment. Wherein the non-resource treatment comprises the following steps: generally three types are filling, solidifying and vitrifying. The non-resource method is mainly characterized in that the hazardous wastes are solidified by physical means and then buried, and because the acid-washing sludge and the dedusting ash contain a large amount of metal elements of chromium and iron, the direct burying of the metal chromium can cause pollution to soil and water; at present, the research on the resource utilization of the pickling sludge by teasel roots is also carried out in China, wherein in the patent of Yangling et al, Beijing university of science and technology, "a method for treating the pickling sludge containing Cr by slag bath" (application number: CN 201910334451A), the invention adds a reducing agent and lime into the pickling sludge containing chromium, fully mixes and presses balls; and carrying out slag bath reaction on the obtained sludge pellets, crushing and magnetically separating the cooled slag, and sorting out metal particles. The patent has the disadvantages of complicated flow, poor magnetic separation effect after slag bath, high process energy consumption, small treatment capacity and difficult industrial popularization.
Therefore, it is necessary to provide a simple and efficient method for comprehensively utilizing stainless steel solid wastes.
Disclosure of Invention
Aiming at the problems that valuable elements of iron, chromium and nickel in stainless steel pickling sludge and dedusting ash are difficult to effectively recycle, lead, zinc, alkali metal, hexavalent chromium pollute the environment and the like in the prior art, the invention provides a comprehensive utilization method of stainless steel solid waste, namely a technological process mainly comprising stainless steel solid waste-chromite-pelletizing-grate preheating-rotary kiln prereduction-electric furnace melting, and the invention can realize harmless treatment of the stainless steel solid waste and comprehensive utilization of resources of iron, chromium, nickel and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
a comprehensive utilization method of stainless steel solid waste comprises the following steps:
(1) pretreating the raw materials to obtain raw materials with preset fineness;
(2) uniformly mixing acid-washed sludge, dedusting ash, iron scale, chromite, a binder and a reducing agent according to a set proportion, and pelletizing in a disc pelletizer to obtain green pellets with set granularity;
(3) putting the green pellets into a chain grate, drying and oxidizing and preheating at a preset wind speed temperature to obtain preheated pellets;
(4) mixing the preheated pellets with a reducing agent, putting the mixture into a rotary kiln, and carrying out pre-reduction at 1150-1300 ℃ to obtain pre-reduced pellets;
(5) mixing the pre-reduced pellets, a reducing agent and a melting additive, and adding the mixture into a smelting furnace or an electric furnace for smelting to obtain pig iron which can be used as a stainless steel raw material.
In a preferable scheme, in the step (1), the pretreatment is wet ball milling, and the concentration of wet ball milling pulp is 60-80%.
Preferably, in the step (1), the acid-washing sludge is dried by a cylinder dryer, the chromite and the iron scale are subjected to wet ball milling until the particle size of-0.074 mm accounts for more than 90%, and the particle size of the dedusting ash, the binder and the reducing agent is controlled to be more than 80% of-0.074 mm.
In the preferable scheme, in the step (2), the binder is bentonite or laterite-nickel ore, the addition amount of the bentonite is 1.5-2.5 wt% of the mixture, and the addition amount of the laterite-nickel ore is 8-10 wt% of the mixture.
In a preferable scheme, in the step (2), the reducing agent is coal powder or coke powder, and the addition amount of the reducing agent is 0-10 wt% of the mixture.
Preferably, in the step (2), the size of the disc machine is 800mm in diameter, 200mm in depth, and the granularity of the green pellets is controlled to be 8-16 mm.
In the invention, acid-washing sludge, dedusting ash, iron scale, chromite, a binder and an additive are mixed according to a predetermined proportion, and green pellets with the diameter of 8-16 mm are obtained by a pelletizer; grinding the mixed material to below 1mm, obtaining mother balls by a disc machine, adding water to grow the mesh mother balls, and compacting the obtained green balls for 2min to obtain 8-16 mm green balls.
In the preferable scheme, in the step (3), the drying temperature is 250-350 ℃, the drying time is 5-8 min, and the drying air speed is 0.8-1.4 m/s.
In the preferable scheme, in the step (3), the oxidation preheating temperature is 800-1100 ℃, the oxidation preheating time is 5-15 min, and the oxidation preheating wind speed is 1.2-2.4 m/s.
Preferably, in the step (3), the compressive strength of the preheated pellets is more than 500N/pellet.
According to the invention, chromium-containing green balls are placed in a chain grate, the height of a material layer is controlled to be 150-180 mm, and the green balls are subjected to blast drying, air draft drying, preheating and other processes in sequence to obtain preheating balls with the compressive strength of more than 500N for subsequent pre-reduction.
In the preferable scheme, in the step (4), the reducing agent is coal powder or coke powder, the pre-reduction temperature is 1200-1250 ℃, the pre-reduction time is 45-200 min, and the mass ratio of the coal mine is 0.6-2.5.
In the invention, the pre-heated pellets are mixed with a reducing agent according to a certain proportion, and the pre-reduced pellets are obtained through a rotary kiln; weighing a certain amount of preheated pellets, adding a reducing agent according to the coal-mineral ratio of 0.6-2.5, reducing for a period of time at 1150-1300 ℃ to obtain reduced pellets with the metallization rate of more than 50% and carbon residue with the fixed carbon content of more than 75%, and removing sulfide, fluoride, lead zinc and alkali metal in dangerous waste such as acid-washing sludge in the reduction stage of a rotary kiln.
In the preferable scheme, in the step (5), the reducing agent is the residual carbon residue obtained by pre-reducing the rotary kiln, and the adding amount of the reducing agent is 5-20 wt% of the mass of the pre-reduced pellets; the melt additive is silica.
In the preferable scheme, in the step (5), the melting temperature is 1550-1700 ℃, the melting time is 10-30 min, and the melting distribution of coal is 5-20%.
Further, in the step (5), the melting temperature is 1600-1700 ℃, and the melting time is 15-30 min.
In the invention, the pre-reduced pellets are mixed with a reducing agent (the residual carbon pre-reduced by the rotary kiln) and silica according to a certain proportion, and the chromium-containing molten iron and slag are obtained through a smelting furnace or an electric furnace; weighing a certain amount of pre-reduced pellets, adding 5-20% of reducing agent, adjusting the slag type by adding silica, and melting and separating the mixture in a smelting furnace or an electric furnace at the temperature of 1550-1700 ℃ to obtain the high-quality stainless steel production raw material containing more than 50% of iron and more than 30% of chromium.
The invention has the beneficial technical effects that:
(1) the method provided by the invention can effectively treat solid wastes (acid-washing sludge, dedusting ash and iron scale) in stainless steel production, and solves the problems of high treatment cost and poor stability of dangerous wastes in stainless steel production.
(2) The method provided by the invention takes stainless steel solid waste (acid-washing sludge, dedusting ash and iron scale) as a pellet raw material, utilizes a coal-based direct reduction-melting process and is matched with chromite to produce the chromium-containing dust mud metallized pellet with excellent metallization rate and strength, and effectively recovers valuable elements of iron, chromium and nickel in the stainless steel hazardous waste.
(3) The method provided by the invention can be used for treating solid waste in stainless steel production, can effectively remove sulfur, fluorine, lead, zinc, arsenic and alkali metals in dangerous waste in the pre-reduction stage of the rotary kiln, and has the removal rate of more than 90%.
(4) The method provided by the invention has the advantages of simple and mature process, low energy consumption, no secondary pollution, capability of utilizing the existing production equipment without newly building a production line, and capability of really realizing 'leaving factory, namely treatment' of the dangerous stainless steel waste.
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FIG. 1 is a process flow diagram of the comprehensive utilization method of stainless steel solid waste.
Detailed Description
The following examples further illustrate embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.
The invention provides a comprehensive utilization method of stainless steel solid waste, which comprises the following steps:
(1) pretreating raw materials:
drying the acid-washing sludge by a cylindrical dryer, performing wet ball milling on the chromite and the iron scale until the particle size of the chromite and the iron scale is-0.074 mm and accounts for more than 90%, and controlling the particle size of the dust, the laterite-nickel ore and the reducing agent to be-0.074 mm and account for more than 80%;
(2) pelletizing:
uniformly mixing acid-washed sludge, dedusting ash, iron scale, chromite, coke powder and a binder (bentonite or laterite-nickel ore) according to a set proportion, pelletizing in a disc pelletizer, and controlling the green pellet granularity to be 8-16 mm;
(3) drying, oxidizing and preheating:
putting the green pellets into a chain grate, drying and oxidizing and preheating at a preset wind speed and temperature to obtain preheated pellets with the strength of more than 500N;
(4) pre-reduction:
mixing the preheated pellets with a reducing agent, putting the mixture into a rotary kiln, heating the mixture in the rotary kiln to 1150-1300 ℃ for prereduction, reducing iron oxide in the materials into metallic iron by carbon or CO under a high-temperature condition, reducing hexavalent chromium in hazardous waste into trivalent chromium by C under a high-temperature condition, reducing part of trivalent chromium into metallic chromium by C, and reducing and removing sulfides, fluorides, lead and zinc oxides in pickling sludge and dedusting ash;
(5) melting and separating:
mixing the pre-reduced pellets, a melting additive and a reducing agent, putting the mixture into a reaction tank, putting the reaction tank into a smelting furnace (electric furnace), heating the mixture to 1550-1700 ℃ for melting, reacting for 20-40 min, deeply reducing unreduced iron oxide in the pre-reduced pellets into metallic iron, aggregating the metallic iron with iron in a pre-reduction stage, reducing trivalent chromium into metallic chromium under the high-temperature condition of the electric furnace, and enabling aluminum oxide, silicon dioxide and sodium oxide in materials to enter a slag phase, wherein the obtained pig iron can be used as a stainless steel raw material, so that harmless treatment of dangerous stainless steel waste and effective utilization of iron and chromium are realized.
In the embodiment of the invention, the main chemical components of the acid-washing sludge are as follows: 10% -25% of omega (Fe), 3% -6% of omega (Cr), and omega (Ni)<5% and the balance CaF2、CaO、SiO2、CaSO4And the like.
The main chemical components of the dedusting ash are as follows: 30-40% of omega (Fe), 8% of omega (Cr) and 5% of omega (Ni).
The main chemical components of the iron scale are as follows: 70-75% of omega (Fe), wherein 60-67% of omega (FeO) and 5% of omega (Ni).
The technical solution of the present invention is explained in detail by the following specific examples.
Example 1
Pickling sludge (TFe 13.51%, Cr)2O35.26%), fly ash (TFe 33.82%, Cr2O39.38%), chromite (TFe 21.68%, Cr2O320.81%), laterite-nickel ore (TFe 14.20%, SiO)241.41 percent, 18.04 percent of MgO and coke powder as raw materials.
The raw materials are mixed according to the proportion of 10 percent of acid-washing sludge, 10 percent of dust-removing ash, 62 percent of chromite, 8 percent of laterite-nickel ore and 10 percent of coke powder; the acid washing sludge is dehydrated and dried, and the chromite is processed byWet ball milling until the diameter of-0.074 mm is more than 90%, uniformly mixing the ball-milled chromite with acid-washing sludge, dedusting ash, laterite-nickel ore and coke powder, pelletizing on a disc machine to obtain green pellets with the diameter of 8-12 mm, the green pellet moisture of 10.93% and the falling strength of 13.4/time-0.5 m-1The compressive strength is 18.28N/piece;
placing green balls into a chain grate machine, wherein the height of a material layer is 150-180 mm, the blast drying temperature is 220-260 ℃, the blast drying time is 3-6 min, the blast drying wind speed is 1.2m/s, the air draft drying temperature is 200 ℃, the air draft drying time is 3-6 min, and the air draft drying wind speed is 1.4 m/s; drying and preheating at the preheating temperature of 800 ℃, the preheating time of 10min and the preheating medium wind speed of 1.6m/s to obtain the chromium-containing dust mud preheated pellets with the compressive strength of more than 500N;
the method comprises the following steps of (1) thermally loading dust sludge preheated pellets into a rotary kiln, controlling the rotating speed of the rotary kiln to be 1rpm, the filling rate to be 25%, adding bituminous coal as a reducing agent, maintaining micro-positive pressure in the rotary kiln at a coal/ore ratio of 2:1, and reducing for 120min in a constant-temperature reduction interval at 1230 ℃, so as to obtain chromium-containing dust sludge pre-reduced pellets with the compression strength of 1000N/pellets and the reduction degree of more than 60%, wherein the sulfur removal rate of acid-washed sludge and dust removal ash is 91.4%, the lead and zinc removal rate is more than 95%, and the fluorine removal rate is more than 90%;
adding silica into the pre-reduced pellets containing chromium dust mud to control the SiO in slag system230 percent of the raw material is added with 10 percent of carbon residue, the raw material is smelted in an electric furnace at 1700 ℃ for 20min to obtain the pig iron containing 50.6 percent of iron, 38.2 percent of chromium and 8 percent of carbon, which are raw materials for producing high-quality stainless steel, and the recovery rate of iron in the chromium-containing pig iron reaches 93.53 percent and the recovery rate of chromium reaches 77.46 percent.
Example 2
Pickling sludge (TFe 13.51%, Cr)2O35.26%,) fly ash (TFe 33.82%, Cr2O39.38%), chromite (TFe 21.68%, Cr2O320.81 percent), iron scale (TFe 73.98 percent) and laterite-nickel ore (TFe 14.2 percent and Ni 1.5 percent) as raw materials.
The raw materials are mixed according to the proportion of 10 percent of acid-washing sludge, 10 percent of dust-removing ash, 10 percent of iron scale, 8 percent of chromite and 8 percent of laterite-nickel ore; the acid washing sludge is dehydratedDrying, performing wet ball milling on the chromite and the iron scale until the particle diameter is more than 90 percent when the particle diameter is-0.074 mm, uniformly mixing the chromite and the iron scale after ball milling with acid-washing sludge, dedusting ash and laterite-nickel ore, sieving with a square hole sieve of 1mm, and pelletizing on a disc machine to obtain green pellets with the diameter of 8-12 mm, the moisture of the green pellets of 11.20 percent and the falling strength of the green pellets of 4.2/time.0.5 m-1The compressive strength is 13.55N;
placing green pellets into a grate, and preparing chromium-containing dust mud preheated pellets under the conditions of 150mm of material layer height, 240 ℃ of forced air drying, 4min of forced air drying time, 1.2m/s of forced air drying wind speed, 200 ℃ of induced air drying temperature, 5min of drying time, 1.4m/s of induced air drying wind speed, 1050 ℃ of preheating temperature, 10min of preheating time and 2.2m/s of preheating wind speed to obtain the chromium-containing dust mud preheated pellets with the compressive strength of more than 500N;
putting the preheated pellets of the chromium-containing dust mud into a rotary kiln, controlling the rotating speed of the rotary kiln to be 1rpm, the filling rate to be 25 percent, carrying out hot charging of the preheated pellets into a furnace, maintaining micro-positive pressure in the kiln at a coal/ore mass ratio of 2:1, and reducing for 120min in a constant-temperature reduction interval at 1230 ℃, so as to obtain the chromium-containing dust mud pre-reduced pellets with the compression strength of 1150N/pellets and the reduction degree of 70.66 percent, wherein the sulfur removal rate of the acid-washed sludge and the dust removal ash is 90 percent, the removal rates of lead, zinc and alkali metals are both more than 95 percent, and the fluorine removal rate is more than 90 percent;
adding silica into the pre-reduced pellets containing chromium dust mud to control the SiO in slag system2The electric furnace smelting is carried out at the temperature of 30 percent, the temperature of the electric furnace is 1700 ℃, the adding amount of residual coal is 15 percent, and the melting time is 30min, so that 56.60 percent of iron, 32.90 percent of chromium and 8 percent of carbon-containing chromium-containing pig iron are obtained, the pig iron is a high-quality stainless steel raw material, the recovery rate of iron in the chromium-containing pig iron reaches 98.23 percent, the recovery rate of chromium reaches 95.03 percent, and valuable elements of iron, chromium and nickel in dangerous wastes such as pickling sludge and the like are effectively recovered.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The comprehensive utilization method of the stainless steel solid wastes is characterized by comprising the following steps of:
(1) pretreating the raw materials to obtain raw materials with preset fineness;
(2) uniformly mixing acid-washed sludge, dedusting ash, iron scale, chromite, a binder and a reducing agent according to a set proportion, and pelletizing in a disc pelletizer to obtain green pellets with set granularity;
(3) putting the green pellets into a chain grate, drying and oxidizing and preheating at a preset wind speed temperature to obtain preheated pellets;
(4) mixing the preheated pellets with a reducing agent, putting the mixture into a rotary kiln, and carrying out pre-reduction at 1150-1300 ℃ to obtain pre-reduced pellets;
(5) mixing the pre-reduced pellets, a reducing agent and a melting additive, and adding the mixture into a smelting furnace or an electric furnace for smelting to obtain the pig iron.
2. The comprehensive utilization method of the stainless steel solid waste according to claim 1, wherein in the step (1), the pretreatment is wet ball milling, and the concentration of wet ball milling pulp is 60-80%; drying the acid-washed sludge by a cylindrical dryer, performing wet ball milling on the chromite and the iron scale until the particle size of the chromite and the iron scale is-0.074 mm and accounts for more than 90%, and controlling the particle size of the dedusting ash, the binder and the reducing agent to be-0.074 mm and accounts for more than 80%.
3. The comprehensive utilization method of the stainless steel solid waste according to claim 1, characterized in that in the step (2), the binder is bentonite or laterite-nickel ore, the addition amount of the bentonite is 1.5-2.5 wt% of the mixture, and the addition amount of the laterite-nickel ore is 8-10 wt% of the mixture.
4. The comprehensive utilization method of the stainless steel solid waste according to claim 1, wherein in the step (2), the reducing agent is coal powder or coke powder, and the addition amount of the reducing agent is 0-10 wt% of the mixture.
5. The comprehensive utilization method of stainless steel solid wastes according to claim 1, wherein in the step (2), the size of a disc machine is 800mm in diameter, 200mm in depth, and the particle size of green pellets is controlled to be 8-16 mm.
6. The comprehensive utilization method of the stainless steel solid wastes according to claim 1, wherein in the step (3), the drying temperature is 250-350 ℃, the drying time is 5-8 min, and the drying air speed is 0.8-1.4 m/s.
7. The comprehensive utilization method of the stainless steel solid wastes according to claim 1, wherein in the step (3), the oxidation preheating temperature is 800-1100 ℃, the oxidation preheating time is 5-15 min, and the oxidation preheating wind speed is 1.2-2.4 m/s.
8. The comprehensive utilization method of the stainless steel solid waste according to claim 1, wherein in the step (4), the reducing agent is coal powder or coke powder, the pre-reduction temperature is 1200-1250 ℃, the pre-reduction time is 45-200 min, and the mass ratio of coal mines is 0.6-2.5.
9. The comprehensive utilization method of the stainless steel solid waste according to claim 1, wherein in the step (5), the reducing agent is the residual carbon residue pre-reduced in the rotary kiln, and the adding amount of the reducing agent is 5-20 wt% of the mass of the pre-reduced pellets; the melt additive is silica.
10. The comprehensive utilization method of the stainless steel solid waste according to claim 1, wherein in the step (5), the melting temperature is 1550-1700 ℃, the melting time is 10-30 min, and the melting distribution coal is 5-20%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114015878A (en) * | 2021-09-28 | 2022-02-08 | 浙江瑞浦机械有限公司 | Stainless steel pickling sludge resource recycling method |
| CN114317952A (en) * | 2021-12-10 | 2022-04-12 | 江苏沙钢集团有限公司 | Method for reprocessing and utilizing iron scale |
| CN114438314A (en) * | 2022-01-21 | 2022-05-06 | 酒泉钢铁(集团)有限责任公司 | Process for using stainless steel pickling sludge as iron ore concentrate sintering ingredient |
| CN114854985A (en) * | 2022-05-17 | 2022-08-05 | 宝武集团环境资源科技有限公司 | Method and system for cooperatively treating steel rolling oil sludge and iron-containing zinc dust sludge by rotary hearth furnace |
| WO2024187392A1 (en) * | 2023-03-15 | 2024-09-19 | 广东邦普循环科技有限公司 | Full-chain integrated method for recovering waste stainless steel, and positive electrode material and precursor thereof |
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| CN114015878A (en) * | 2021-09-28 | 2022-02-08 | 浙江瑞浦机械有限公司 | Stainless steel pickling sludge resource recycling method |
| CN114317952A (en) * | 2021-12-10 | 2022-04-12 | 江苏沙钢集团有限公司 | Method for reprocessing and utilizing iron scale |
| CN114438314A (en) * | 2022-01-21 | 2022-05-06 | 酒泉钢铁(集团)有限责任公司 | Process for using stainless steel pickling sludge as iron ore concentrate sintering ingredient |
| CN114854985A (en) * | 2022-05-17 | 2022-08-05 | 宝武集团环境资源科技有限公司 | Method and system for cooperatively treating steel rolling oil sludge and iron-containing zinc dust sludge by rotary hearth furnace |
| WO2024187392A1 (en) * | 2023-03-15 | 2024-09-19 | 广东邦普循环科技有限公司 | Full-chain integrated method for recovering waste stainless steel, and positive electrode material and precursor thereof |
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