CN114774712A - Treatment process of high-chlorine high-zinc metallurgy dust and sludge - Google Patents
Treatment process of high-chlorine high-zinc metallurgy dust and sludge Download PDFInfo
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- CN114774712A CN114774712A CN202210381416.7A CN202210381416A CN114774712A CN 114774712 A CN114774712 A CN 114774712A CN 202210381416 A CN202210381416 A CN 202210381416A CN 114774712 A CN114774712 A CN 114774712A
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- dust
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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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/34—Obtaining zinc oxide
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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
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
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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
- C22B1/005—Preliminary treatment of scrap
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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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
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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
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/20—Obtaining alkaline earth metals or magnesium
-
- 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
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/20—Obtaining alkaline earth metals or magnesium
- C22B26/22—Obtaining magnesium
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
Abstract
The invention is suitable for the technical field of metallurgy, and provides a treatment process of high-chlorine high-zinc metallurgy dust and mud, which comprises the following process steps: s1, taking the high-chlorine high-zinc metallurgy dust and mud, directly conveying the dust and mud to a middle ash bin above a cloth bag ash dissolving tank, and discharging the dust and mud into the dissolving tank through an automatic ash discharge valve; s2, adding the leaching agent into a dissolving tank; s3, sending the liquid in the dissolving tank to a plate-and-frame filter press, and separating filtrate and a dechlorination iron-containing material by using the plate-and-frame filter press; s4, sending the filtrate obtained in the step S3 into a multi-effect evaporator, and separating and purifying by utilizing the difference of the solubility of potassium chloride and sodium chloride along with the change of temperature; s5, mixing the dechlorinated iron-containing material obtained in the step S3 with other metallurgical dust and sludge to prepare pellets; drying and then sending into a rotary hearth furnace for high-temperature reduction; according to the invention, the Cl in the high-chlorine high-zinc metallurgy dust and sludge is reduced to below 1% by washing, the Zn is reduced to below 0.3% by using the rotary hearth furnace, and the chlorine salt and the zinc oxide in the high-chlorine high-zinc metallurgy dust and sludge can be separated and purified.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a treatment process of high-chlorine high-zinc metallurgy dust and mud.
Background
In the process of steel smelting, impurities such as zinc, chloride and the like in iron ore are frequently gasified in a high-temperature reducing atmosphere due to low boiling point, are introduced into a dust removal system together with flue gas, and are mixed with dust removal ash after being cooled.
For the metallurgical dust mud with high chlorine and high zinc, the metallurgical dust mud is generally recovered in a form of adding low doping amount into sintering ore, the recovery amount is low, and chloride can block the flue of a sintering machine and corrode equipment. Then, people develop a water washing process to treat the high-chlorine high-zinc metallurgy dust and mud, so that the problems of flue blockage and equipment corrosion caused by chloride are solved, but the unrecovered zinc oxide (more than 0.3%) still has the risk of accretion in a blast furnace, the treatment capacity is not large, and the problem of recovering the high-chlorine high-zinc metallurgy dust and mud cannot be really solved.
The rotary hearth furnace is a process for separating and purifying metal elements by utilizing the characteristic that metal simple substances have different boiling points, is a metallurgy dust and mud recovery process which is commonly used at home and abroad at present, and can extract zinc from the metallurgy dust and mud to prepare zinc oxide powder. However, under the high temperature treatment conditions, it is still impossible to recover high chlorine dust (Cl > 1%) on a large scale for preventing the clogging of the flue and the corrosion of the equipment.
Disclosure of Invention
The invention provides a treatment process of high-chlorine high-zinc metallurgical dust and sludge, and aims to solve the problems that the high-zinc dust and sludge cannot be treated by the conventional washing process and the high-chlorine dust and sludge cannot be treated by the rotary hearth furnace process.
The invention is realized in such a way that a treatment process of high-chlorine high-zinc metallurgical dust and sludge comprises the following process steps:
s1, taking high-chlorine high-zinc metallurgical dust and mud from the bottom of the storage bin, directly conveying the dust and mud to a middle ash bin above a cloth bag ash dissolving tank, and unloading the dust and mud into the dissolving tank through an automatic ash unloading valve; s2, adding the leaching agent into a dissolving tank to promote the deposition of Ca and Mg salts and the dissolution of sodium chloride and potassium chloride; s3, sending the liquid in the dissolving tank to a plate-and-frame filter press, and separating filtrate and a dechlorination iron-containing material by using the plate-and-frame filter press; s4, sending the filtrate (Cl is more than or equal to 90g/L, Ca and Mg is less than 20g/L) obtained in the step S3 into a multi-effect evaporator, and separating and purifying by utilizing the difference of the solubility of potassium chloride and sodium chloride along with the temperature change; s5, placing the dechlorinated iron-containing material obtained in the step S3 into a crusher for crushing, mixing the crushed dechlorinated iron-containing material with other metallurgical dust and sludge, wherein the proportion of the crushed dechlorinated iron-containing material to the metallurgical dust and sludge is more than 25%, and preparing pellets with 13% of water, 3 times of falling strength/0.5 m and less than 1% of Cl; and drying, and then feeding into a rotary hearth furnace for high-temperature reduction to obtain DRI balls and flue gas.
Preferably, in the process of step S1, Cl in the high-chlorine high-zinc metallurgy dust mud is more than 2%, and Zn is more than 1%.
Preferably, during step S1, the mass ratio of water to ash is 1.1: 1.
preferably, in the step S3, the dechlorinated iron-containing material has a water content of 19 +/-1% and Cl < 1%.
Preferably, in the step S4, the filtrate enters a multi-effect evaporator and is dehydrated to obtain sodium chloride, potassium chloride and mother liquor.
Preferably, the mother liquor flows into the multi-effect evaporator, the mother liquor is changed into steam through the multi-effect evaporator, and the obtained steam is returned to the dissolving tank for recycling.
Preferably, in the step S5, the other metallurgical dust and mud is low-chlorine metallurgical dust and mud; the mixing process comprises the following steps: and (3) feeding the dechlorination iron-containing material, the binder and the low-chlorine metallurgical dust and sludge into a horizontal intensive mixer for mixing to obtain a material A.
Preferably, the pellet made with water content of 13%, drop strength of 3 times/0.5 m, Cl < 1% comprises: sending the obtained material A to a ball press machine for processing to obtain a material B; and sending the obtained material B to a chain grate for processing to obtain the pellet.
Preferably, the method further comprises the following steps: s6, treating the flue gas in the step S5 by a waste heat boiler to obtain steam, and then filtering the flue gas in a cloth bag of a dust remover to obtain ZnO powder.
Preferably, the DRI (metallized) spheres Zn is < 0.3% and the zinc oxide powder Cl is < 15% during step S5.
Compared with the prior art, the invention has the beneficial effects that:
the invention uses the combined process method of water washing and rotary hearth furnace to treat the high-chlorine high-zinc metallurgy dust and sludge, and solves the problems that the water washing process is difficult to treat the high-zinc dust and the rotary hearth furnace process is difficult to treat the high-chlorine dust; according to the invention, the Cl content in the high-chlorine high-zinc metallurgy dust and mud is reduced to below 1% by washing, the Zn content is reduced to below 0.3% by using the rotary hearth furnace, and the chlorine salt and the zinc oxide in the high-chlorine high-zinc metallurgy dust and mud can be separated and purified.
Drawings
FIG. 1 is a process flow diagram of the treatment process of high-chlorine high-zinc metallurgical dust and sludge of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or may be connected through both members. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, a process for treating high-chlorine high-zinc metallurgical dust and sludge includes the following steps:
and S1, taking the high-chlorine high-zinc metallurgical dust and mud from the bottom of the storage bin, directly conveying the dust and mud to a middle dust bin above the cloth bag dust dissolving pool, and unloading the dust and mud into the dissolving pool through an automatic dust unloading valve.
Specifically, in the step S1, Cl in the high-chlorine high-zinc metallurgy dust mud is more than 2%, and Zn in the high-chlorine high-zinc metallurgy dust mud is more than 1%; the mass ratio of water to ash is 1.1: 1.
s2, adding the leaching agent into the dissolving tank to promote the deposition of Ca and Mg salts and the dissolution of sodium chloride and potassium chloride.
And S3, sending the liquid in the dissolving tank to a plate-and-frame filter press, and separating the filtrate and the dechlorination iron-containing material by using the plate-and-frame filter press.
Specifically, in the step S3, the iron-containing material after dechlorination has a water content of 19 +/-1% and Cl of less than 1%.
S4, sending the filtrate (Cl is more than or equal to 90g/L, Ca + Mg is less than 20g/L) obtained in the step S3 into a multi-effect evaporator, and separating and purifying by utilizing the difference of the solubility of potassium chloride and sodium chloride along with the temperature change.
Specifically, in the step S4, the filtrate enters a multi-effect evaporator and is dehydrated to obtain sodium chloride, potassium chloride and mother liquor. The mother liquor flows into the multi-effect evaporator, the mother liquor is changed into steam through the multi-effect evaporator, and the obtained steam is returned to the dissolving tank for recycling.
S5, placing the dechlorinated and iron-containing material obtained in the step S3 into a crusher to be crushed, mixing the crushed dechlorinated and iron-containing material with other metallurgical dust and mud, wherein the proportion of the crushed dechlorinated and iron-containing material to the metallurgical dust and mud is more than 25%, and preparing pellets with the water content of 13%, the falling strength of 3 times/0.5 m and the Cl content of less than 1%; and drying, and then feeding into a rotary hearth furnace for high-temperature reduction to obtain DRI balls and flue gas.
Specifically, in the step S5, the other metallurgical dust and sludge is low-chlorine metallurgical dust and sludge; the dechlorination iron-containing material can be crushed into 0-3mm powder;
the mixing process comprises the following steps: feeding the dechlorinated iron-containing material, the binder and the low-chlorine metallurgical dust and sludge into a horizontal intensive mixer for mixing to obtain a material A.
The pellet with 13% water content, 3 times of falling strength/0.5 m and Cl less than 1% is prepared by the following steps: sending the obtained material A to a ball press machine for processing to obtain a material B; and (4) sending the obtained material B to a chain grate for processing to obtain the pellet.
In the process of step S5, the DRI (metallized) ball Zn is less than 0.3 percent, and the zinc oxide powder Cl is less than 15 percent.
Example 2
Referring to fig. 1, a process for treating high-chlorine high-zinc metallurgical dust and sludge includes the following steps:
and S1, taking the high-chlorine high-zinc metallurgical dust and mud from the bottom of the storage bin, directly conveying the dust and mud to a middle dust bin above the cloth bag dust dissolving pool, and unloading the dust and mud into the dissolving pool through an automatic dust unloading valve.
Specifically, in the step S1, Cl in the high-chlorine high-zinc metallurgy dust mud is more than 2%, and Zn in the high-chlorine high-zinc metallurgy dust mud is more than 1%; the mass ratio of water to ash is 1.1: 1.
s2, adding the leaching agent into a dissolving tank to promote the deposition of Ca and Mg salts and the dissolution of sodium chloride and potassium chloride.
And S3, sending the liquid in the dissolving tank to a plate-and-frame filter press, and separating the filtrate and the dechlorination iron-containing material by using the plate-and-frame filter press.
Specifically, in the step S3, the moisture content in the dechlorinated iron-containing material is 19 +/-1%, and Cl is less than 1%.
S4, sending the filtrate (Cl is more than or equal to 90g/L, Ca + Mg is less than 20g/L) in the step S3 into a multi-effect evaporator, and separating and purifying by utilizing the difference of the solubility of potassium chloride and sodium chloride along with the temperature change.
Specifically, in the step S4, the filtrate enters a multi-effect evaporator and is dehydrated to obtain sodium chloride, potassium chloride and mother liquor. The mother liquor flows into the multi-effect evaporator, the mother liquor is changed into steam through the multi-effect evaporator, and the obtained steam is returned to the dissolving tank for recycling.
S5, placing the dechlorinated iron-containing material obtained in the step S3 into a crusher for crushing, mixing the crushed dechlorinated iron-containing material with other metallurgical dust and sludge, wherein the proportion of the crushed dechlorinated iron-containing material to the metallurgical dust and sludge is more than 25%, and preparing pellets with 13% of water, 3 times of falling strength/0.5 m and less than 1% of Cl; and drying, and then feeding into a rotary hearth furnace for high-temperature reduction to obtain DRI balls and flue gas.
Specifically, in the step S5, the other metallurgical dust and sludge is low-chlorine metallurgical dust and sludge; the dechlorination iron-containing material can be crushed into 0-3mm powder;
the mixing process comprises the following steps: feeding the dechlorinated iron-containing material, the binder and the low-chlorine metallurgical dust and sludge into a horizontal intensive mixer for mixing to obtain a material A.
The pellet with 13% water content, 3 times of falling strength/0.5 m and Cl less than 1% is prepared by the following steps: sending the obtained material A to a ball press machine for processing to obtain a material B; and (4) sending the obtained material B to a chain grate for processing to obtain the pellet.
In the process of step S5, the DRI (metallized) ball Zn is less than 0.3 percent, and the zinc oxide powder Cl is less than 15 percent.
S6, treating the flue gas in the step S5 by a waste heat boiler to obtain steam, and then filtering the flue gas in a cloth bag of a dust remover to obtain ZnO powder.
In conclusion, the invention uses the combined process method of water washing and the rotary hearth furnace to treat the high-chlorine high-zinc metallurgy dust and mud, thereby solving the problems that the water washing process is difficult to treat the high-zinc dust and the rotary hearth furnace process is difficult to treat the high-chlorine dust; according to the invention, the Cl content in the high-chlorine high-zinc metallurgy dust and mud is reduced to below 1% by washing, the Zn content is reduced to below 0.3% by using the rotary hearth furnace, and the chlorine salt and the zinc oxide in the high-chlorine high-zinc metallurgy dust and mud can be separated and purified.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. A treatment process of high-chlorine high-zinc metallurgical dust and sludge is characterized by comprising the following steps:
the method comprises the following process steps:
s1, taking high-chlorine high-zinc metallurgy dust and mud from the bottom of a storage bin, directly conveying the dust and mud to a middle dust bin above a cloth bag dust dissolving pool, and discharging the dust and mud into the dissolving pool through an automatic dust discharging valve;
s2, adding the leaching agent into a dissolving tank to promote the deposition of Ca and Mg salts and the dissolution of sodium chloride and potassium chloride;
s3, sending the liquid in the dissolving tank to a plate and frame filter press, and separating the filtrate and the dechlorination iron-containing material by using the plate and frame filter press;
s4, sending the filtrate (Cl is more than or equal to 90g/L, Ca and Mg is less than 20g/L) obtained in the step S3 into a multi-effect evaporator, and separating and purifying by utilizing the difference of the solubility of potassium chloride and sodium chloride along with the temperature change;
s5, placing the dechlorinated and iron-containing material obtained in the step S3 into a crusher to be crushed, mixing the crushed dechlorinated and iron-containing material with other metallurgical dust and mud, wherein the proportion of the crushed dechlorinated and iron-containing material to the metallurgical dust and mud is more than 25%, and preparing pellets with the water content of 13%, the falling strength of 3 times/0.5 m and the Cl content of less than 1%; and drying, and then feeding into a rotary hearth furnace for high-temperature reduction to obtain DRI balls and flue gas.
2. The process for treating high-chlorine high-zinc metallurgical dust and sludge according to claim 1, which is characterized by comprising the following steps:
in the process of step S1, Cl in the high-chlorine high-zinc metallurgical dust mud is more than 2 percent, and Zn is more than 1 percent.
3. The process for treating high-chlorine high-zinc metallurgical dust and sludge according to claim 1, which is characterized by comprising the following steps:
in the step S1, the mass ratio of water to ash is 1.1: 1.
4. the process for the disposal of high chlorine high zinc metallurgical dust and sludge according to claim 1, wherein:
in the step S3 process, the water content in the dechlorination iron-containing material is 19 +/-1%, and Cl is less than 1%.
5. The process for treating high-chlorine high-zinc metallurgical dust and sludge according to claim 1, which is characterized by comprising the following steps:
in the step S4, the filtrate enters a multi-effect evaporator and is dehydrated to obtain sodium chloride, potassium chloride and mother liquor.
6. The process for the disposal of high chlorine high zinc metallurgical dust and sludge as claimed in claim 5, wherein:
and the mother liquor flows into the multi-effect evaporator, the mother liquor is changed into steam through the multi-effect evaporator, and the obtained steam is returned to the dissolving tank for recycling.
7. The process for the disposal of high chlorine high zinc metallurgical dust and sludge according to claim 1, wherein:
in the step S5 process, the other metallurgical dust and mud is low-chlorine metallurgical dust and mud;
the mixing process comprises the following steps: and (3) feeding the dechlorination iron-containing material, the binder and the low-chlorine metallurgical dust and sludge into a horizontal intensive mixer for mixing to obtain a material A.
8. The process for the disposal of high chlorine high zinc metallurgical dust and sludge according to claim 7, wherein:
the pellet with 13% water content, 3 times of falling strength/0.5 m and Cl less than 1% is prepared by the following steps:
sending the obtained material A to a ball press machine for processing to obtain a material B;
and sending the obtained material B to a chain grate for processing to obtain pellet ore.
9. The process for the disposal of high chlorine high zinc metallurgical dust and sludge according to claim 1, wherein:
further comprising the steps of:
and S6, treating the flue gas in the step S5 by a waste heat boiler to obtain steam, and then filtering the flue gas in a cloth bag of a dust remover to obtain ZnO powder.
10. The process for the disposal of high chlorine high zinc metallurgical dust and sludge according to claim 1, wherein:
in the process of step S5, the DRI (metallized) ball Zn is less than 0.3 percent, and the zinc oxide powder Cl is less than 15 percent.
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| CN202210381416.7A CN114774712A (en) | 2022-04-12 | 2022-04-12 | Treatment process of high-chlorine high-zinc metallurgy dust and sludge |
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| CN202210381416.7A CN114774712A (en) | 2022-04-12 | 2022-04-12 | Treatment process of high-chlorine high-zinc metallurgy dust and sludge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115305346A (en) * | 2022-09-14 | 2022-11-08 | 中南大学 | Method for reducing corrosion of grate bars in sintering process |
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| US5286465A (en) * | 1992-06-29 | 1994-02-15 | Solomon Zaromb | Hydrometallurgical process for recovering iron sulfate and zinc sulfate from baghouse dust |
| KR101538746B1 (en) * | 2015-03-13 | 2015-07-22 | 하종길 | Method for manufacturing and recovering zinc chloride from ZnO contained in dust of the electric arc furnace |
| CN111647753A (en) * | 2020-05-19 | 2020-09-11 | 北京科技大学 | Method for recovering zinc by direct reduction of melting gasification furnace |
| CN113061735A (en) * | 2021-03-30 | 2021-07-02 | 宝武集团环境资源科技有限公司 | Zinc-containing dust treatment system and method based on water washing process |
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2022
- 2022-04-12 CN CN202210381416.7A patent/CN114774712A/en active Pending
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|---|---|---|---|---|
| US5286465A (en) * | 1992-06-29 | 1994-02-15 | Solomon Zaromb | Hydrometallurgical process for recovering iron sulfate and zinc sulfate from baghouse dust |
| KR101538746B1 (en) * | 2015-03-13 | 2015-07-22 | 하종길 | Method for manufacturing and recovering zinc chloride from ZnO contained in dust of the electric arc furnace |
| CN111647753A (en) * | 2020-05-19 | 2020-09-11 | 北京科技大学 | Method for recovering zinc by direct reduction of melting gasification furnace |
| CN113061735A (en) * | 2021-03-30 | 2021-07-02 | 宝武集团环境资源科技有限公司 | Zinc-containing dust treatment system and method based on water washing process |
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| 王琼;贵永亮;宋春燕;: "冶金含铁尘泥再资源化的技术现状与展望", 河北联合大学学报(自然科学版), no. 03 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115305346A (en) * | 2022-09-14 | 2022-11-08 | 中南大学 | Method for reducing corrosion of grate bars in sintering process |
| CN115305346B (en) * | 2022-09-14 | 2023-06-02 | 中南大学 | Method for reducing corrosion of grate bar in sintering process |
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