CN100574888C - A kind of by silica sand separating feldspar and quartzy method - Google Patents
A kind of by silica sand separating feldspar and quartzy method Download PDFInfo
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- CN100574888C CN100574888C CN200510103131A CN200510103131A CN100574888C CN 100574888 C CN100574888 C CN 100574888C CN 200510103131 A CN200510103131 A CN 200510103131A CN 200510103131 A CN200510103131 A CN 200510103131A CN 100574888 C CN100574888 C CN 100574888C
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Abstract
The invention discloses a kind ofly by silica sand separating feldspar and quartzy method, it is characterized in that: will contain feldspar and quartzy silica sand and send into dry-type magnetic extractor it is carried out sorting, described silica sand particle diameter is 0.074～2.0mm.This method technology is simple, when silica sand passes through the magnetic roller of rotation, utilizes magnetic contrast quartzy and feldspar, and separation of material is dished out along different movement locus, effectively isolates quartz, feldspar and impurity in the silica sand, improves the SiO of its silica sand
2Content reduces Fe
2O
3Content, quartzy SiO
2Content can reach 99.9%; And non-environmental-pollution and container etching problem, cost is low, and energy resource consumption is low, is easy to promotion and implementation.
Description
Technical field
The present invention relates to a kind of beneficiation method of silica sand, particularly a kind of by silica sand separating feldspar and quartzy method, be particularly useful for separating feldspar simple ore thing Fe
3O
3The separation of content＞0.1% silica sand.
Background technology
China's silica sand major part is that feldspar and quartz mix symbiosis, wherein SiO
2Content is low, Al
2O
3And Fe
2O
3The content height can not satisfy industry, and especially float glass industry must be handled the requirement that just can reach float glass by ore dressing to the requirement of quartz raw material purity.
For a long time, the technical staff thinks that always separating feldspar and quartzy most effectual way are floatations, and the method for floating of present domestic use has three kinds: flotation silica sand new technology in hydrofluoric acid floatation, floride-free floatation, the alkaline medium.
The hydrofluoric acid floatation is to adopt hydrofluoric acid or fluoride to make the activator of feldspar.The feldspar of this method and quartzy sorting are good, and index is stable, can obtain high-quality quartz sand and feldspar byproduct.But because of containing the fluorine ion of high concentration in the waste water, when discharging to severe environmental pollution, though to discharging again after the flotation waste water processing, can reach country's " sewage comprehensive discharge " GB8978-1996 standard, but because the waste discharge amount is very big, the disposal cost height, increased production cost, and equipment corrosion is serious in the sour environment, therefore, has limited the application of this method.
Floride-free floatation is invented in order to solve hydrofluoric acid method environmental pollution.This method is used sulfuric acid, without hydrofluoric acid, has solved the pollution problem of hydrofluoric acid floatation fluorine ion to environment.But its feldspar, quartzy sorting be not as the hydrofluoric acid method, and dosing is big, equipment corrosion is serious in the medicament price height, sour environment, has influenced its promotion and application.
Flotation silica sand new technology is floatation for separating feldspar and a quartz in alkaline medium in the alkaline medium, selects new medicament for use, has reduced medicament expense usefulness, has solved environmental pollution and the acid etching problem to equipment.But this method still exists feldspar, the not good problem of quartzy sorting index, and particularly for the silica sand of some region, feldspar is poorer with quartzy sorting, and its application and popularization have certain limitation.
Up to this point, to the method for separating of feldspathic silica sand just wash usually, simple process such as desliming, classification, iron, aluminium content are still very high in the silica sand.The float glass industry have to be made main siliceous raw material with sandstone, adds a spot of feldspathic silica sand or feldspar, because that sandstone is crossed the superfine powder of pulverizing is many, adds iron, aluminium content height in the silica sand that simple ore dressing handles, and the difficult quality of float glass improves.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the purpose of this invention is to provide a kind of non-environmental-pollution and equipment corrosion, good separation effect, cost and energy consumption are low, and the method by silica sand separating feldspar and quartz that operation is simple.
To achieve these goals, the present invention adopts following technical scheme: a kind of by silica sand separating feldspar and quartzy method, its characteristics are: the silica sand that will contain feldspar and quartz is sent into dry-type magnetic extractor, utilize the magnetic roller of establishing in this dry-type magnetic extractor that it is carried out sorting, described silica sand particle diameter is 0.074～2.0mm.
The Surface field intensity of above-mentioned dry-type magnetic extractor magnetic roller is at least 0.2 tesla, and the best is set at 0.2～3 tesla.The material of its sorting directly falls in the default material district, this material district is according to a setting that falls into that separates the back material, can adopt the baffle plate enclosing, also can be set to the blanking storehouse, this blanking storehouse can be according to a position of adjusting its placement that falls into of material, and the blanking storehouse can require to be set to monobucket, twin-bucket or three buckets according to the material magnetic separation.
In order to improve quartzy sharpness of separation, above the demarcation strip in the middle of above-mentioned twin-bucket or the three bucket blanking storehouses, a upwardly extending division board is installed, division board can be fixedly connected with the demarcation strip bottom, also can with the demarcation strip top one fixed rotating shaft be installed in the division board bottom, division board can according to material to fall into the vertical direction be datum line, rotate in 0 °～90 ° scopes of 0 °～90 ° of left-hands or dextrad.
In order to guarantee the magnetic separation effect of dry-type magnetic extractor, as required, also can carry out preliminary treatment before sorting to above-mentioned silica sand raw ore, its concrete steps are: 1) carry out the screening of coarse granule material and removing of fine particle stage material, wherein, the screen size of coarseparticulate material screen choosing is 0.10mm～2.0mm; The partition size of fine particle stage material is 0.074～0.50mm; 2) material after the step 1) screening is carried out drying, this material moisture≤3% after its drying; 3) with step 2) material be cooled to below 80 ℃.
Above-mentioned drying can adopt oven dry or dry naturally, and drying plant and bake out temperature can require according to the difference of different material and purposes is determined.
Magnetic roller among the present invention directly rotates by the power that motor and speed change gear thereof provide, also can motor and speed change gear drive driven voller, driven voller drives the magnetic roller and rotates, magnetic roller rotating speed is generally 10～500r/min.
Operation principle of the present invention is: because silica sand is granular sand grains, though wherein contained quartz and feldspar all belong to non magnetic ore, but it is quartzy different with the content of feldspar impurities element, the magnetic force that is subjected in magnetic field still there are differences, during magnetic roller by rotating, quartz and feldspar particle form different movement locus under the force action of its acceleration, gravity, magnetic force, fall into different material districts.Do not have magnetic force or be subjected to the little quartz particles of magnetic force to throw position away from the magnetic roller along magnetic roller rotation direction; Then fallen into from the near position of magnetic roller by the big feldspar particle of magnetic force.By regulating the rotating speed or the division board angle of magnetic roller, isolate high-quality quartzy washed ore and feldspar ore deposit.
The present invention adopts technique scheme, its beneficial effect is as follows: 1) silica sand magnetic separation pre-treating technology is simple, easy operating, the silica sand after screening and classification are handled is sent into magnetic separator through belt conveyor, during magnetic roller by rotating, the magnetic field intensity that the magnetic roller is had, make the quartz and the feldspar that have magnetic contrast originally, fall, by the material of selecting different parabolas to fall along different parabolas, obtain the quartz sand of different purity, the quartz sand SiO that sub-elects
2Content can reach 99.90%; 2) the present invention has changed for a long time that the industry has overcome the technology prejudice that the dry type magnetic separation mode can not be separated silica sand to traditional sorting mode that silica sand adopted, and has realized silica sand andesine and quartzy separating by the dry type magnetic separation mode first.3) the present invention adopts the dry type magnetic separation method, does not use chemical agent, and especially hydrofluoric acid or fluoride have been avoided environmental pollution, also avoided the problem of chemical agent, reduced the equipment input, cut down finished cost equipment corrosion, reduced energy resource consumption, economical and practical, be easy to promotion and implementation.
Description of drawings
Fig. 1 moves towards schematic diagram for the separation that material of the present invention enters dry-type magnetic extractor
Fig. 2 is dry-type magnetic extractor belt conveyor and the mutual structural relation schematic diagram of magnetic roller, magnetic roller and variable speed electric motors, particularly
The specific embodiment
The present invention is a kind of by silica sand separating feldspar and quartzy method, specifically is that the silica sand that contains feldspar and quartz is sent into dry-type magnetic extractor, utilizes the magnetic roller of establishing in this dry-type magnetic extractor that it is carried out sorting, and described silica sand particle diameter is 0.074～2.0mm;
The Surface field intensity of above-mentioned dry-type magnetic extractor magnetic roller is set at 0.2 tesla at least, and the best is set at 0.2～3 tesla.The material of above-mentioned sorting directly falls in the default material district, this material district is according to a setting that falls into that separates the back material, can adopt the baffle plate enclosing, also can be set to the blanking storehouse, this blanking storehouse can be according to a position of adjusting its placement that falls into of material, and the blanking storehouse can require to be set to monobucket, twin-bucket or three buckets according to the material magnetic separation.
In order to improve quartzy sharpness of separation, above the demarcation strip in the middle of above-mentioned twin-bucket or the three bucket blanking storehouses, a upwardly extending division board is installed, division board can be fixedly connected with the demarcation strip bottom, also can with the demarcation strip top one fixed rotating shaft be installed in the division board bottom, division board can according to material to fall into the vertical direction be datum line, along rotating in 0 °～90 ° of this rotating shaft left-hands or 0 °～90 ° scopes of dextrad.
In order to guarantee the magnetic separation effect of dry-type magnetic extractor, as required, also can carry out preliminary treatment before sorting to above-mentioned silica sand raw ore, its concrete steps are: 1) carry out the screening of coarse granule material and removing of fine particle stage material, wherein, the screen size of coarseparticulate material screen choosing is 0.10mm～2.0mm; The partition size of fine particle stage material is 0.074～0.50mm; 2) material after the step 1) screening is carried out drying, this material moisture≤3% after its drying; 3) with step 2) material be cooled to below 80 ℃.
Above-mentioned drying mode can adopt oven dry or dry mode naturally, drying plant select for use and bake out temperature can require according to the difference of different material and purposes is definite.
Magnetic roller among the present invention directly rotates by the power that motor and speed change gear thereof provide, also can motor and speed change gear drive driven voller, driven voller drives the magnetic roller and rotates, magnetic roller rotating speed is generally 10～500r/min.
In order to improve the screening effect of silica sand, can also carry out washing screening to the impure more silica sand of original glomeration, remove impurity such as shell, gravel, vegetation, the screen size of roughly selecting is 1～10mm; In order to improve the productive rate of qualified grade silica sand, surpass 10% silica sand for coarse granule content and increase Grinding procedure, grinding attachment adopts rod mill or ball mill, carry out the screening of step 1) through the silica sand material behind the ore grinding again and remove coarse granule, screening plant can be selected rotary screen or vibratory sieve or hexagonal reel for use; Remove the processing of fine particle stage material, can select hydrocyclone or sand washer for use; Step 2) drying process is that the silica sand material that will remove behind the fine grained dries under natural endowment; Also can place drying equipment to dry, after the step 3) oven dry with material, after guaranteeing that material enters dry-type magnetic extractor, its with high temperature dry-type magnetic extractor produce is destroyed, before material enters dry-type magnetic extractor, material must be cooled off, below the chilling temperature to 80 ℃; Drying and cooled material are sent in the dry-type magnetic extractor by batcher, delivered on the magnetic roller through belt conveyor; The magnetic field intensity on selected dry-type magnetic extractor magnetic roller surface is at least 0.2 tesla, and best magnetic roller Surface field intensity is set at 0.2～3 tesla; By regulating motor and speed change gear thereof, determine that it drives the drum speed of magnetic roller; Because silica sand is granular sand grains, wherein contained quartz and feldspar are non-magnetic material, when through the magnetic roller that rotation, the high-intensity magnetic field that magnetic roller surface is had, make quartz and feldspar with magnetic contrast, under the magnetic force influence, dish out, because of suitable its movement locus of the gravity of himself falls into the appointed place according to different movement locus.The below that does not have magnetic force or turned to along the magnetic roller by the little quartz particles of magnetic force to throw the magnetic roller is from magnetic roller position far away; Then fallen into from the near position of magnetic roller by the big feldspar particle of magnetic force, like this, quartzy and feldspar be because of the magnetic contrast that himself had, and the movement locus in a magnetic field is different and finally realized separating of quartzy and two kinds of materials of feldspar.
Falling into a little of dry-type magnetic extractor material, can also in magnetic field, show different movement locus with feldspar according to quartzy, to select the blanking storehouse is set, single storehouse can be arranged in the blanking storehouse, the special quartzy washed ore that falls into that receives; Also can be arranged to two storehouses, lay respectively at active magnetic roller below from the far away and near position of magnetic roller, the blanking storehouse near from the magnetic roller receives the feldspar ore deposit that falls, and the blanking storehouse far away from the magnetic roller receives the quartzy washed ore that falls; In order to improve the productive rate of quartzy washed ore, can also be equipped with one above the demarcation strip between the Shuan Cang is the rotary division board in center with the fixed axis, it is the center that this division board can be designed to the fixing point, with the vertical direction is datum line, dextrad is rotated interior this division board of adjusting of scope at 0 °～90 ° angles or 0 °～90 ° of angles of left-hand rotation, obtains high-quality quartzy washed ore by adjusting division board.
Concrete separation process as shown in Figure 1, silica sand material of the present invention enters on the transmission belt 2 of dry-type magnetic extractor through a batcher 1, magnetic roller 3 drives transmission belt 2, isolated quartz falls into the concentrate store 4-1 in blanking storehouse 4 at transmission belt 2 upper edges its parabolic railway line 2-1, isolated feldspar falls into the feldspar ore storage bin 4-2 in blanking storehouse 4 along its parabolic railway line 2-2, and the demarcation strip upper end that folder is established between the concentrate store 4-1 in blanking storehouse 4 and the feldspar ore storage bin 4-2 is connected a division board 5 by a rotating shaft.
As shown in Figure 2, the transmission belt 2 of dry-type magnetic extractor is sheathed on magnetic roller 3 and the driven voller, and magnetic roller 3 is driven by variable speed electric motors, particularly 6, drives driven voller and rotates, silica sand falls into the blanking storehouse that magnetic roller 3 is provided with below respectively after being set at magnetic roller 3 surface isolation of 0.2～3 tesla through Surface field intensity
Below by several instantiations method of the present invention is described in further detail:
Example 1:
The first step: select loose granule shape silica sand material for use, its chemical analysis is: SiO
293.91%, Al
2O
33.30%, Fe
2O
30.21%; Its granule materials is screened, and its screen size is 0.5mm; Second step: undersize material is removed fine fraction less than 0.2mm with hydrocyclone; The 3rd step: the silica sand material of 0.2～0.5mm that will be after removing processing dries naturally, and dried water content is 2%; The 4th step: the material after above-mentioned steps is handled is sent into dry-type magnetic extractor and is carried out magnetic separation, and used dry-type magnetic extractor adopts general dry-type magnetic extractor, and the magnetic roller speed setting of dry-type magnetic extractor is 130r/min, and the Surface field intensity of magnetic roller is set at 3 teslas; Concentrate yield after magnetic separation is 48.52%, and its chemical analysis is SiO
299.90%, Fe
2O
30.0026%.
Example 2:
The first step: the original glomeration to silica sand carries out washing screening earlier, removes impurity such as shell, gravel, vegetation, and screen size is 10mm; Silica sand is carried out ore grinding, and grinding attachment adopts rod mill; Through behind the ore grinding the chemical analysis of silica sand material be: SiO
293.91%, Al
2O
33.31%, Fe
2O
30.20%; Its material is carried out the coarse granule screening, and screen size is made as 2.0mm; Second step: undersize material is removed fine fraction less than 0.5mm with hydrocyclone; The 3rd step: the silica sand material of 0.5～2.0mm that will be after removing processing places drying box, dries under 100 ℃ of temperature, and the water content after the oven dry is 1%, after the oven dry material is cooled to 60 ℃; The 4th step: the material after above-mentioned steps is handled is sent into and is carried out magnetic separation in the general dry-type magnetic extractor, and its magnetic roller speed setting is 500r/min, and the Surface field intensity of magnetic roller is set at 1.0 teslas; Concentrate yield after magnetic separation is 74.52%, and its chemical analysis is SiO
297.80%, Al
2O
31.12%, Fe
2O
30.09%.
Example 3:
The first step: the original glomeration to silica sand carries out washing screening earlier, removes impurity such as shell, gravel, vegetation, and screen size is 1mm; Silica sand is carried out ore grinding, and grinding attachment adopts rod mill; Chemical analysis through the silica sand material behind the ore grinding is: SiO
293.1%, Al
2O
33.30%, Fe
2O
30.21%; Its material is carried out coarse granule remove, screen size is 0.35mm; Second step: undersize material is removed fine fraction less than 0.074mm with hydrocyclone; The 3rd step: the silica sand granule materials of 0.074～0.35mm that will be after removing processing dries naturally; Dried water content is 3%; The 4th goes on foot: dried material is sent into carried out magnetic separation in the general dry-type magnetic extractor, its magnetic roller speed setting is 10r/min, and the Surface field intensity of magnetic roller is set at 0.2 tesla; Concentrate yield after magnetic separation is 82.52%, and its chemical analysis is SiO
296.00%, Al
2O
32.08%, Fe
2O
30.10%.
Example 4:
The first step: select loose granule shape silica sand material for use, its chemical analysis is: SiO
293.91%, Al
2O
33.30%, Fe
2O
30.21%; Its material is screened, and its screen size is 0.7mm; Second step: undersize material is removed fine fraction less than 0.1mm with hydrocyclone; The 3rd step: the silica sand material of 0.1～0.7mm that will be after removing processing dries naturally; Dried water content is 3%; The 4th step: the material after above-mentioned steps is handled is sent into general dry-type magnetic extractor and is carried out magnetic separation, and the magnetic roller rotating speed of establishing dry-type magnetic extractor is 130r/min, and the Surface field intensity of magnetic roller is set at 0.5 tesla; Concentrate yield after magnetic separation is 76.52%, and its chemical analysis is SiO
296.80%, Al
2O
31.66%, Fe
2O
30.095%.
Example 5:
The first step: the original glomeration to silica sand carries out washing screening earlier, removes impurity such as shell, gravel, vegetation, and screen size is 10mm; Silica sand is carried out ore grinding, and grinding attachment adopts rod mill; Chemical analysis through the silica sand material behind the ore grinding is: SiO
293.91%, Al
2O
33.30%, Fe
2O
30.21%; Its granule materials is screened, and its screen size is set at 0.6mm; Second step: undersize material is removed fine fraction less than 0.1mm with hydrocyclone; The 3rd step: the silica sand material of 0.1～0.6mm that will be after removing processing places drying box, dries under 100 ℃ of temperature, and the water content after the oven dry is 0.3%, after the oven dry material is cooled to 79 ℃; The 4th step: the material after above-mentioned steps is handled is sent into general dry-type magnetic extractor and is carried out magnetic separation, and the speed setting of dry-type magnetic extractor magnetic roller is 260r/min, and the Surface field intensity of magnetic roller is set at 3 teslas; Concentrate yield after magnetic separation is 40.22%, and its chemical analysis is SiO
299.00%, Al
2O
30.49%, Fe
2O
30.06%.
Example 6:
The first step: the silica sand material is directly sent into general dry-type magnetic extractor carry out magnetic separation, the speed setting of dry-type magnetic extractor magnetic roller is 260r/min, and the Surface field intensity of magnetic roller is set at 1.0 teslas; Concentrate yield after magnetic separation is 78.22%, and its chemical analysis is SiO
297.8%, Al
2O
31.49%, Fe
2O
30.086%.
In the above-mentioned example 1～6, general dry-type magnetic extractor is the optional equipment of buying on the market, selected dry-type magnetic extractor can be reequiped the blanking district according to the needs of feed separation, left magnetic roller tiltedly below can be provided with a blanking storehouse, the blanking storehouse can be set to a pipeful of or twin-bucket or three buckets, falls into quartz and feldspar after the separation respectively; Simultaneously, in order to improve quartzy separation purity, above twin-bucket or three bucket blanking storehouse central dividing plates, a division board can also be installed, the center that this division board can be designed to porch, blanking storehouse is a fixing point, with the vertical direction is datum line, and dextrad is rotated interior this division board of adjusting of scope at 0 °～90 ° angles or 0 °～90 ° of angles of left-hand rotation.
Claims (6)
1, a kind of by silica sand separating feldspar and quartzy method, it is characterized in that: the silica sand that will contain feldspar and quartz is sent into dry-type magnetic extractor, the silica sand material enters on the transmission belt (2) of dry-type magnetic extractor through a batcher (1), magnetic roller (3) drives transmission belt (2), isolated quartz falls into the concentrate store (4-1) of blanking storehouse (4) at its parabolic railway line (2-1) of transmission belt (2) upper edge, isolated feldspar falls into the feldspar ore storage bin (4-2) in blanking storehouse (4) along its parabolic railway line (2-2), and the demarcation strip upper end that folder is established between the concentrate store (4-1) of blanking storehouse (4) and the feldspar ore storage bin (4-2) is connected a division board (5) by a rotating shaft; Wherein, transmission belt (2) is sheathed on magnetic roller (3) and the driven voller, and magnetic roller (3) is driven by variable speed electric motors, particularly (6), drives driven voller and rotates, silica sand falls into the blanking storehouse that magnetic roller (3) is provided with below respectively after being set at magnetic roller (3) surface isolation of 0.2～3 tesla through Surface field intensity; Utilize the magnetic roller of establishing in this dry-type magnetic extractor that silica sand is carried out sorting, described silica sand particle diameter is 0.074～2.0mm.
2, separating feldspar as claimed in claim 1 and quartzy method is characterized in that: described blanking storehouse (4) is set in monobucket, twin-bucket or three buckets a kind of.
3, separating feldspar as claimed in claim 2 and quartzy method is characterized in that: the described demarcation strip upwardly extending division board in top (5) is installed in the middle of described twin-bucket or the described three bucket blanking storehouses.
4, separating feldspar as claimed in claim 3 and quartzy method, it is characterized in that: described division board (5) bottom is connected by a fixed rotating shaft with described demarcation strip top, its division board is datum line with the vertical direction, rotates in 0 °～90 ° of this rotating shaft left-hands or 0 °～90 ° scopes of dextrad.
5, as claim 1 or 2 or 3 or 4 described separating feldspars and quartzy method, it is characterized in that: the silica sand before the described sorting is carried out preliminary treatment, its concrete steps are: 1) carry out the screening of coarse granule material and removing of fine particle stage material, wherein, the screen size of coarseparticulate material screen choosing is set to 0.10mm～2.0mm; The partition size of fine particle stage material is set to 0.074～0.50mm; 2) material after the step 1) screening is carried out drying, its dry back material moisture≤3%; 3) with step 2) dried material is cooled to below 80 ℃.
6, separating feldspar as claimed in claim 5 and quartzy method is characterized in that: step 2) described drying is for oven dry or dry naturally.
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|---|---|---|---|
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| CN101497058A (en) * | 2008-01-31 | 2009-08-05 | 黄崧基 | Method for separating rhombic quartz and quartz from efflorescent granite mineral |
| CN103785534A (en) * | 2014-01-23 | 2014-05-14 | 天紫再生资源加工（天津）有限公司 | System for recycling metal from solid garbage |
| CN104437830A (en) * | 2014-11-05 | 2015-03-25 | 中国地质科学院郑州矿产综合利用研究所 | Process for removing impurities and improving whiteness of calcite ore |
| CN105618261A (en) * | 2016-03-24 | 2016-06-01 | 陈勇 | Device for magnetite separation by blowing ore sand through strong breeze |
| CN105618253A (en) * | 2016-03-24 | 2016-06-01 | 陈勇 | Device for magnetite separation by impacting ore sand through paraboloid |
| CN108579987B (en) * | 2018-04-11 | 2019-12-24 | 辽宁万隆科技研发有限公司长沙分公司 | Method for extracting quartz concentrate by utilizing desert aeolian sand |
| CN108579988B (en) * | 2018-04-11 | 2020-06-09 | 辽宁万隆科技研发有限公司长沙分公司 | Method for extracting feldspar ore concentrate by utilizing desert aeolian sand |
| CN109046762B (en) * | 2018-10-12 | 2023-11-10 | 北方稀土(安徽)永磁科技有限公司 | Rare earth alloy raw material treatment method and device |
| CN112192306A (en) * | 2020-10-21 | 2021-01-08 | 苏州艾米欧精密机械股份有限公司 | Chip removal and dust removal device of machining tool |
| CN112495579B (en) * | 2020-12-08 | 2023-01-24 | 永丰县广润化工有限公司 | Nonmetal mineral impurity screening and subpackaging mechanism |
| CN113333159B (en) * | 2021-05-28 | 2023-04-07 | 中冶宝钢技术服务有限公司 | Method for improving iron grade of steel slag with thickness of below 5mm |
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2005
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