CN113277754A - Process method for preparing cement product by utilizing desulfurized manganese slag - Google Patents
Process method for preparing cement product by utilizing desulfurized manganese slag Download PDFInfo
- Publication number
- CN113277754A CN113277754A CN202110494074.5A CN202110494074A CN113277754A CN 113277754 A CN113277754 A CN 113277754A CN 202110494074 A CN202110494074 A CN 202110494074A CN 113277754 A CN113277754 A CN 113277754A
- Authority
- CN
- China
- Prior art keywords
- desulfurized
- manganese slag
- cement
- parts
- manganese
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 91
- 239000011572 manganese Substances 0.000 title claims abstract description 91
- 239000002893 slag Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000004568 cement Substances 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 17
- 239000004575 stone Substances 0.000 claims abstract description 17
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 14
- 239000011449 brick Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000000654 additive Substances 0.000 claims abstract description 7
- 230000000996 additive effect Effects 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000012216 screening Methods 0.000 claims abstract description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 239000000571 coke Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000005868 electrolysis reaction Methods 0.000 abstract description 2
- 239000011456 concrete brick Substances 0.000 description 10
- 238000002386 leaching Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229940093474 manganese carbonate Drugs 0.000 description 2
- 235000006748 manganese carbonate Nutrition 0.000 description 2
- 239000011656 manganese carbonate Substances 0.000 description 2
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 description 2
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009854 hydrometallurgy Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
-
- 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
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of manganese electrolysis, and relates to a process method for preparing a cement product by utilizing desulfurized manganese slag. The process method comprises the steps of 1, screening the desulfurized manganese slag into three particle sizes of 0-5 mm, 5-12 mm and 12-20 mm; 2. using the desulfurized manganese slag with the thickness of 0-5 mm as a cement admixture, a cement raw material or a raw material for preparing a water permeable brick; 3. mixing 5-12 mm of desulfurized manganese slag with cement, fly ash, sand and water, and using the mixture as a raw material of a cement product: 4. mixing 12-20 mm of desulfurized manganese slag with broken stone, cement, fly ash, sand, an additive and water, and using the mixture in concrete materials with non-main structures. The process method effectively utilizes electrolytic manganese production resources, widens the utilization way of the desulfurized manganese slag, protects the environment and saves the land.
Description
Technical Field
The invention belongs to the technical field of manganese electrolysis, and relates to a process method for preparing a cement product by utilizing desulfurized manganese slag.
Background
The electrolytic manganese production industry, as a typical hydrometallurgy industry, is rapidly developed and also has serious harm to the environment, wherein the electrolytic manganese slag has a prominent pollution to the environment. The electrolytic manganese slag is filtered acid slag generated by treating manganese ore with sulfuric acid in the process of producing electrolytic manganese metal by using manganese carbonate ore, and the amount of the manganese slag discharged when 1 ton of electrolytic manganese is produced is 3-10 tons, and is 5-6 tons on average according to different grades of the manganese ore.
Because the manganese content of manganese carbonate ore in China is generally not high, more manganese slag can be generated by metal manganese of each unit of production, more than 90% of slag samples are produced in China globally, the stock is huge, but the utilization amount is very little. The requirements of foreign electrolytic manganese enterprises on electrolytic manganese waste residue treatment are strict, and tail storage disposal is generally adopted. Because the manganese slag in China has no mature treatment technology, electrolytic manganese enterprises mostly convey the waste slag to a storage yard for damming and wet-process storage; while the method occupies a large amount of land resources, the leaching of high-concentration wastewater can cause heavy metal pollution and soil hardening of soil; under the conditions of leaching and rainwater leaching, the ammonia nitrogen of surface water can exceed the standard, and great harm is caused to the environment. Therefore, the method reasonably and effectively treats the electrolytic manganese slag, reduces the harm of the manganese slag to the maximum extent, and utilizes the electrolytic manganese slag in multiple channels, which becomes a bottleneck problem to be solved urgently in the electrolytic manganese industry and the environmental protection field.
Disclosure of Invention
The invention aims to provide a process method for preparing a cement product by utilizing desulfurized manganese slag, which effectively utilizes desulfurized manganese slag, widens the application of desulfurized manganese slag, and is more energy-saving and environment-friendly.
The technical scheme of the invention for solving the technical problems is as follows.
A process method for preparing cement products by utilizing desulfurized manganese slag comprises the following steps:
(1) crushing the desulfurized manganese slag, and screening into desulfurized manganese slag with three particle sizes of 0-5 mm, 5-12 mm and 12-20 mm by using a three-layer vibrating screen; the desulfurization manganese slag is obtained by the following method: the electrolytic manganese slag is calcined at high temperature of 1200-1350 ℃, coke with 8-10% of the consumption of the electrolytic manganese slag is added in the calcining process, and the sulfur content in the treated desulfurized manganese slag is 3-8%;
(2) directly using the desulfurized manganese slag with the granularity of 0-5 mm as a cement admixture, a cement raw material or a raw material for preparing a water permeable brick;
(3) mixing the desulfurized manganese slag with the granularity of 5-12 mm with cement, fly ash, sand and water, and using the mixture as a raw material of a cement product: wherein, the materials are mixed according to the following parts by weight: 860-960 parts of desulfurized manganese slag, 150-190 parts of cement, 130-170 parts of fly ash, 880-1000 parts of sand and 150-180 parts of water;
(4) mixing desulfurized manganese slag with the granularity of 12-20 mm with broken stone, cement, fly ash, sand, an additive and water according to the following parts by mass, and replacing the broken stone to be used in a concrete material with a non-main structure; wherein, the materials are mixed according to the following parts by weight: 400-500 parts of desulfurized manganese slag, 600-700 parts of broken stone, 200-300 parts of cement, 50-150 parts of fly ash, 700-800 parts of sand, 150-250 parts of water and 5-10 parts of an additive; the particle size of broken gravels is 10-15 mm.
The process method for preparing the cement product by utilizing the desulfurized manganese slag has the beneficial effects that the desulfurized manganese slag with different particle sizes is adjusted to prepare concrete by utilizing the desulfurized manganese slag to replace broken stones, sand (aggregate) and the like, so that a large amount of desulfurized manganese slag is consumed; the method effectively utilizes electrolytic manganese production resources, widens the utilization way of the desulfurized manganese slag, prolongs the industrial chain, recycles industrial solid wastes generated in the electrolytic manganese production process, protects the environment, saves the land and leads the electrolytic manganese industry to develop healthily and orderly.
Detailed Description
Example 1
A process method for preparing a cement product by utilizing desulfurized manganese slag comprises the following steps.
(1) Calcining the electrolytic manganese slag at the high temperature of 1200-1350 ℃, and adding coke with the use amount of 8-10% of the electrolytic manganese slag in the calcining process to obtain desulfurized manganese slag; the total analysis data of the treated desulfurized manganese slag are shown in the following table:
as can be seen from the data in the table above, SO3The content of (A) is 6.72%, and the sulfur content is high.
The physical property data of the treated desulfurized manganese slag are shown in the following table:
as can be seen from the table above, the void ratio of the desulfurized manganese slag with higher sulfur content is 54.64%, which is higher than the standard requirement.
(2) Transferring the desulfurized manganese slag with the particle size of 35-100 mm to a stock ground, and crushing by using a cone crusher; conveying the crushed desulfurized manganese slag to a receiving bin, conveying the desulfurized manganese slag to a belt conveyor through a vibrating feeder at a feed opening of the receiving bin, and then enabling the material to enter a three-layer vibrating screen for screening, wherein the upper-layer screen is 20mm, the middle-layer screen is 12mm, and the lower-layer screen is 5 mm; screening the material into desulfurized manganese slag with three particle sizes of 0-5 mm, 5-12 mm and 12-20 mm by using a three-layer vibrating screen, and then conveying the desulfurized manganese slag into a storage bin through a belt conveyor and a bucket elevator respectively; and conveying the materials with the particle size of more than 20mm to a temporary storage bin through a belt conveyor, returning the materials to the cone crusher through a constant feeder below the temporary storage bin, and continuously crushing the materials into the desulfurized manganese slag with the particle size of less than 20 mm.
Example 2
The desulfurized manganese slag with the granularity of 0-5 mm obtained in the example 1 is directly used as a cement admixture, a cement raw material or a raw material for preparing a water permeable brick.
Example 3
The desulfurized manganese slag with the particle size of 5-12 mm obtained in the example 1 is mixed with cement, fly ash, sand and water to be used as a raw material of cement products (such as various concrete bricks, wall materials and the like). Specifically, the materials are weighed, mixed and uniformly stirred according to four mixing ratios shown in the following table, the materials are filled into a brick making mold, the brick making mold is vibrated for 30 seconds by using a stone vibration table, the surface is smoothed, the brick making mold is demoulded after being placed for 24 hours, the concrete brick with the size of 200mm multiplied by 100mm multiplied by 60mm can be obtained after the maintenance for 7 days or 28 days under the normal temperature condition, and the performance of the prepared concrete brick is measured, wherein the table is shown in the following table.
The concrete brick prepared by mixing the desulfurized manganese slag with cement, sand, fly ash and the like has the advantages of smooth surface, less holes, better compactness and slight bleeding. As can be seen from the table above, the usage amount of the desulfurized manganese slag is 40.37-44.09%, the usage amount of the fly ash is 6.88-6.93%, the usage amount of the cement is 7.34-8.32%, the usage amount of the natural sand is 40.67-45.41%, and the water consumption is not counted; the compressive strength of the concrete brick is more than 44MPa in 7 days and more than 48MPa in 28 days, and the concrete brick meets the requirements of the national standard GB/T28635-2012 concrete pavement brick; in addition, the measured water absorption rate is between 4.6% and 5.0%, and the water absorption rate is within the technical requirements of the concrete pavement brick.
Example 4
The desulfurized manganese slag with the particle size of 12-20 mm obtained in the example 1 is mixed with broken stone (the particle size of the broken stone is 10-15 mm), cement, fly ash, sand, an additive and water, and the mixture is used for replacing the broken stone in concrete materials with non-main structures, such as terraces, stock yards, pavement water stabilizing materials and the like. Specifically, the materials are weighed, mixed and uniformly stirred according to two mixing ratios shown in the following table, the materials are filled into a brick making mold, the brick making mold is vibrated for 30 seconds by using a stone vibration table, the surface is smoothed, the brick making mold is demoulded after being placed for 24 hours, the concrete brick with the size of 100mm multiplied by 100mm is obtained after the maintenance for 7 days or 28 days under the normal temperature condition, and the performance of the prepared concrete brick is measured, wherein the table is shown in the following table.
The concrete brick prepared by mixing the desulfurized manganese slag with cement, sand, fly ash, broken stone, additives and the like has the advantages of smooth surface, less holes, better compactness, no peeling phenomenon and slight bleeding. As can be seen from the table above, the prepared concrete brick has the compressive strength of more than 29MPa in 7 days and the compressive strength of more than 36MPa in 28 days, and meets the requirements of C30 concrete.
In the embodiment, the proportion of the desulfurized manganese slag with different particle sizes is adjusted, so that the concrete is prepared and the desulfurized manganese slag is largely consumed on the basis of ensuring that the performance of the desulfurized manganese slag for replacing broken stone and sand (aggregate) meets the national standard of 'broken stone and pebble for construction' GB/T14685-2011; meanwhile, electrolytic manganese production resources are effectively utilized, an industrial chain is widened and lengthened, industrial solid wastes generated in the electrolytic manganese production process are recycled, the industrial chain is stretched while the environment is protected and the land is saved, a new market is developed, a utilization way of the desulfurized manganese slag is widened, the electrolytic manganese industry is enabled to develop healthily and orderly, the national call is responded, and the production concept of sustainable development of the industry is realized.
Claims (6)
1. A process method for preparing cement products by utilizing desulfurized manganese slag is characterized by comprising the following steps:
(1) crushing the desulfurized manganese slag, and screening into desulfurized manganese slag with three particle sizes of 0-5 mm, 5-12 mm and 12-20 mm by using a three-layer vibrating screen;
(2) directly using the desulfurized manganese slag with the granularity of 0-5 mm as a cement admixture, a cement raw material or a raw material for preparing a water permeable brick;
(3) mixing the desulfurized manganese slag with the granularity of 5-12 mm with cement, fly ash, sand and water, and using the mixture as a raw material of a cement product:
(4) mixing the desulfurized manganese slag with the granularity of 12-20 mm with broken stone, cement, fly ash, sand, an additive and water, and replacing the broken stone to be used in the concrete material with a non-main structure.
2. The process method as claimed in claim 1, wherein in the step (3), the materials are mixed according to the following parts by weight: 860-960 parts of desulfurized manganese slag, 150-190 parts of cement, 130-170 parts of fly ash, 880-1000 parts of sand and 150-180 parts of water.
3. The process method as claimed in claim 1, wherein in the step (4), the materials are mixed according to the following parts by weight: 400-500 parts of desulfurized manganese slag, 600-700 parts of broken stone, 200-300 parts of cement, 50-150 parts of fly ash, 700-800 parts of sand, 150-250 parts of water and 5-10 parts of an additive.
4. The process according to claim 3, wherein in the step (4), the crushed stone has a particle size of 10 to 15 mm.
5. The process according to claim 1, wherein in step (1), the desulfurized manganese slag is obtained by: the electrolytic manganese slag is calcined at high temperature of 1200-1350 ℃, and coke with 8-10% of the consumption of the electrolytic manganese slag is added in the calcining process.
6. The process method as claimed in claim 1, wherein in the step (1), the sulfur content in the desulfurized manganese slag is 3 to 8 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110494074.5A CN113277754A (en) | 2021-05-07 | 2021-05-07 | Process method for preparing cement product by utilizing desulfurized manganese slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110494074.5A CN113277754A (en) | 2021-05-07 | 2021-05-07 | Process method for preparing cement product by utilizing desulfurized manganese slag |
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| CN113277754A true CN113277754A (en) | 2021-08-20 |
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| CN202110494074.5A Pending CN113277754A (en) | 2021-05-07 | 2021-05-07 | Process method for preparing cement product by utilizing desulfurized manganese slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116511220A (en) * | 2023-03-13 | 2023-08-01 | 生态环境部环境规划院 | Manganese slag multistage countercurrent classification resource utilization method based on particle size distribution |
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|---|---|---|---|---|
| US5916362A (en) * | 1996-11-22 | 1999-06-29 | Tosoh Corporation | Method for producing cement using manganese slag as raw material |
| CN102199026A (en) * | 2010-03-25 | 2011-09-28 | 贵州省建筑材料科学研究设计院 | Hollow building block manufactured from electrolytic manganese residues and manufacture method thereof |
| CN102503205A (en) * | 2011-11-04 | 2012-06-20 | 卿富安 | New formula and process method for preparing electrolytic manganese slag brick |
| CN103771734A (en) * | 2014-01-27 | 2014-05-07 | 天津水泥工业设计研究院有限公司 | Method for utilizing electrolytic manganese residue in large-scale calcining treatment |
| CN104030583A (en) * | 2014-06-12 | 2014-09-10 | 贵州省工业固体废弃物综合利用（建材）工程技术研究中心 | Method for preparing cement admixture by use of electrolytic manganese residue and product and application |
| CN108516740A (en) * | 2018-04-25 | 2018-09-11 | 铜仁学院 | Concrete containing electrolytic manganese residues and preparation method thereof, concrete road surface |
| CN110395954A (en) * | 2019-08-01 | 2019-11-01 | 铜仁学院 | A kind of electrolytic manganese residues lightweight aggregate hollow block and preparation method thereof |
-
2021
- 2021-05-07 CN CN202110494074.5A patent/CN113277754A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5916362A (en) * | 1996-11-22 | 1999-06-29 | Tosoh Corporation | Method for producing cement using manganese slag as raw material |
| CN102199026A (en) * | 2010-03-25 | 2011-09-28 | 贵州省建筑材料科学研究设计院 | Hollow building block manufactured from electrolytic manganese residues and manufacture method thereof |
| CN102503205A (en) * | 2011-11-04 | 2012-06-20 | 卿富安 | New formula and process method for preparing electrolytic manganese slag brick |
| CN103771734A (en) * | 2014-01-27 | 2014-05-07 | 天津水泥工业设计研究院有限公司 | Method for utilizing electrolytic manganese residue in large-scale calcining treatment |
| CN104030583A (en) * | 2014-06-12 | 2014-09-10 | 贵州省工业固体废弃物综合利用（建材）工程技术研究中心 | Method for preparing cement admixture by use of electrolytic manganese residue and product and application |
| CN108516740A (en) * | 2018-04-25 | 2018-09-11 | 铜仁学院 | Concrete containing electrolytic manganese residues and preparation method thereof, concrete road surface |
| CN110395954A (en) * | 2019-08-01 | 2019-11-01 | 铜仁学院 | A kind of electrolytic manganese residues lightweight aggregate hollow block and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116511220A (en) * | 2023-03-13 | 2023-08-01 | 生态环境部环境规划院 | Manganese slag multistage countercurrent classification resource utilization method based on particle size distribution |
| CN116511220B (en) * | 2023-03-13 | 2023-12-05 | 生态环境部环境规划院 | Manganese slag multistage countercurrent classification resource utilization method based on particle size distribution |
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Application publication date: 20210820 |