CN1994595A - Method for reutilizing waste and inferior material and grinding abrasive in magnetic material production process - Google Patents
Method for reutilizing waste and inferior material and grinding abrasive in magnetic material production process Download PDFInfo
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- CN1994595A CN1994595A CN 200610022452 CN200610022452A CN1994595A CN 1994595 A CN1994595 A CN 1994595A CN 200610022452 CN200610022452 CN 200610022452 CN 200610022452 A CN200610022452 A CN 200610022452A CN 1994595 A CN1994595 A CN 1994595A
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Abstract
The invention relates to a method for recycling waste material and grinding material in the magnetic material production, wherein it comprises that: discharging the grinding material or waste material with cooling water via water way into multistage deposit pool to be deposited; collecting and filtering the deposits timely, while the water content is lower than 40%; putting it at 30-100% into ball grinding process to be utilized again; collecting discharged water into oily soil separating depositing pool to be treated into discharge standard. The invention can reduce cost and pollution.
Description
Technical field
The present invention relates in a kind of magnetic material production process the recoverying and utilizing method of useless defective material and abrasive, belong to magnetic material production technical field.
Background technology
Strontium permanent-magnet ferrite magnetic material mainly contains ball milling and gets the raw materials ready, moulding, sintering, grinding, operations such as purged and packed in process of production.Because its operation is more, complicated, therefore to produce a certain amount of useless defective material and grinding material (being abrasive) in process of production inevitably.Mainly be reinforced in the ball milling procedure for preparation production process, discharging is drawn water, blowing, transit link fall material, leak material; Run material in the molding procedure production process, fall material, the vacuum abrasive that the material taken away and grinding process produce that draws water, a spot of cleaning material that the purged and packed operation produces.To these useless defective material and abrasive, great majority can both collect, and most of producer still has 10.15 tons/year will lose with current.Produced about 4% useless defective material and abrasive in every month, if processing is proper, it can be turned waste into wealth, and becomes regenerated resources, and is bad as if handling, and then can pollute environment.Because these material are in process of production along with often having mixed some silt particles inevitably more or less in the process of outbound flowing out of gutter, wooden unit, oils etc. cause its performance, mouldability, the defective of sintering appearance poor drops into and utilizes, and loses more than gain.Therefore a lot of producers would rather dispose also is reluctant to utilize again.Magnetic particle proportion is the 2.9-3.1 gram per centimeter simultaneously
3, water insoluble, a part is complete owing to precipitating, also along with water drains into the river in the suspension mode, and the river, the lake, bigger influence has been caused to environment in the sea.Except that abrasive, general producer is that post precipitation is collected, pack, and (100-200 unit/ton) sells at a low price, or works as garbage disposal and fall.For abrasive, most of producers drop into the certain proportion blending with the post precipitation pack to utilize again, and the overwhelming majority is handled in the mode of selling.Because its performance is low than the pre-burning raw material, shrinkage factor is big, so the ratio of recycling and little also produces a part of suspension simultaneously and flows out in precipitation process, environment is impacted.
Therefore, appropriate processing these useless defective material and abrasives, to reduce the pollution to environment, this is the duty-bound obligation of magnetic material manufacturer.
Summary of the invention
The object of the present invention is to provide the recoverying and utilizing method of a kind of useless defective material and abrasive.
The recoverying and utilizing method of useless defective material and abrasive in the magnetic material production process provided by the invention may further comprise the steps:
Abrasive that produces after a, the grinding of magnetic material workpiece or useless defective material are discharged to multifeed clarifier with cooling water through the gutter and precipitate step by step; Described multifeed clarifier is that 2-4 sedimentation basin precipitates successively;
B, regularly to precipitation material in each sedimentation basin collect, drainage is to water content＜40%;
C, abrasive or useless defective material that the b step is reclaimed utilize in 20%-100% ratio input ball milling operation again, will add the auxiliary material that contains following percentage by weight simultaneously:
CaCO
3：0.8％-1.1％，H
3BO
3：0.1％-0.4％，SrCO
3：0.1％-0.4％。
Further, abrasive utilizes in 30%-100% ratio input ball milling operation again in the c step, will add the auxiliary material of following percentage by weight simultaneously:
CaCO
3: 0.8%-1.1%, H
3BO
3: 0.1%-0.3%, SrCO
3: 0.1%-0.4%, SrSO
4: 0.01%-0.04%; Or CaCO
3: 0.8%-1.1%, H
3BO
3: 0.1%-0.3%, SrCO
3: 0.1%-0.4%, Al
2(SO4)
3: 0.01%-0.03%.
The useless defective material of c step adds the auxiliary material of following percentage by weight: CaCO
3: 0.4%-0.8%, H
3BO
3: 0.1%-0.2%, SrCO
3: 0.1%-0.3%, at grinding in ball grinder 0.5-1 hour, the good back of mill drainage was to water content＜40%, and oven dry is pulverized, and crosses 80 sieves, drops into the ball milling operation in the 20%-30% ratio again and re-uses, and adds the auxiliary material of following percentage by weight: CaCO during use
3: 0.8%-1.1%, H
3BO
3: 0.2%-0.4%, SrCO
3: 0.1%-0.3%.
The water that above-mentioned a step is discharged is collected to greasy dirt separate and subside pond, again through sewage disposal to discharge standard, reuse or discharging.
Wherein in a step, 0.5-3 rice that can enter the mouth in the gutter is provided with 1-4 road 20-40 purpose wire net, and water velocity is 0.4-0.9m/s before the wire net, and the wire net inclination angle is to use the 45-75 degree;
Specifically, the recoverying and utilizing method of abrasive provided by the invention can be following steps:
Abrasive that produces after a, the grinding of magnetic material workpiece and cooling water (also can comprise the water that washes ground) are discharged to multifeed clarifier through the gutter and precipitate step by step.Described multifeed clarifier can be a 2-4 sedimentation basin order precipitation successively.Wherein gutter inlet 0.5-3 rice is provided with 1-4 road 20-40 purpose wire net, thick useless blank and a small amount of refuse collection that grinding step is produced exclude, then more tiny non-abrasive impurity is removed, to guarantee that the abrasive that is discharged to sedimentation basin does not have big foreign material, water velocity adopts 0.4-0.9m/s before the wire net, and the 45-75 degree is adopted at the wire net inclination angle.
The sedimentation basin specification can be 3500～5000 * 2500～3500 * 2000～2500mm.
Preferably: 4000 * 3000 * 2000mm.
Water is comparatively clean behind 2-4 level sedimentation basin earns, and is recycled to grinding step by water pump and uses or drain into sewage disposal system.
B, regular (normally weekly) treat that to the collection of precipitation abrasive, drainage in each sedimentation basin precipitation reaches water content＜40% an o'clock pack and piles up, and further drainage more reaches unanimity the abrasive water content;
C, above-mentioned abrasive is dropped into the ball milling operation in the 30%-100% ratio utilize again.
If utilize again in 30%-40% ratio input, on technology, do not have specific (special) requirements and difficulty.But reach 100%, just bigger difficulty has been arranged.Because the magnetic material workpiece performance that grinding step is processed just differs, generally separately not strict yet, have again in grinding step, the mill process in inevitably, part emery wheel abrasive particle will be discharged in the abrasive, add and mixed a certain amount of other objectionable impurities in the discharge process inevitably, also have from magnetic material workpiece and grind the abrasive that gets off on quality, its performance itself is just hanged down a class than material performance.Also there is the bigger shortcoming of shrinkage factor in abrasive, and this has a significant impact guaranteeing product size.
Therefore when dropping into the regeneration product, undertaken by following technology by 40%-100%:
A feeds intake each time and must test water content, calculates abrasive weight according to water content, and accurately weighing feeds intake at every turn.
B auxiliary material technical recipe will necessarily be adjusted:
From original C aCO
3: 0.8%-1.1%, H
3BO
3: 0.2%-0.4%, SrCO
3: 0-0.3%; Be adjusted into:
CaCO
3: 0.8%-1.1%, H
3BO
3: 0.1%-0.3%, SrCO
3: 0.1%-0.4%, SrSO
4: 0.01%-0.04% or CaCO
3: 0.8%-1.1%, H
3BO
3: 0.1%-0.3%, SrCO
3: 0.1%-0.4%, Al
2(SO
4)
3: 0.01%-0.03%.
The material performance of Hui Shouing reaches like this: Br＞400mT, and Hcb＞230kA/m, shrinkage factor also can be controlled at below 1.16 substantially, has reached most of product desired properties, the shrinkage factor requirement.Certainly, by further technical recipe, the adjustment of batching and other procedure technology condition also can be done the higher product of performance.
In addition, the magnetic slag of matting generation also can be recycled together by this method.
Ball milling operation, molding procedure are in process of production, because equipment is many, to take up an area of greatly, the people is many, technology is complicated, so the useless defective material that produces is more assorted and impurity is more relatively, therefore also cause some difficulties, useless defective material to have only through drainage to water content＜40% to recycling, oven dry, pulverize, cross 80 sieves, drop into the ball milling operation in the 20%-30% ratio again and re-use.
The recoverying and utilizing method of useless defective material provided by the invention may further comprise the steps:
The useless defective material that a, ball milling operation and molding procedure produce compiles current drainage with water through the gutter in the suspension mode and precipitates to multifeed clarifier;
B, regular (according to actual conditions, can be decided to be weekly), further drainage was precipitated to water content＜40% to the useless defective material collecting box in each sedimentation basin, and pack is piled up; The useless defective material water content of test pack is calculated 1 ton of required useless defective material weight of net weight material;
The useless defective material of c, 1 ton of net weight material of weighing added 1 ton of QM1000 type grinding in ball grinder 0.5-1 hour, will add the auxiliary material of following percentage by weight simultaneously:
CaCO
3：0.4％-0.8％，H
3BO
3：0.1％-0.2％，SrCO
3：0.1％-0.3％：
Promptly with inflating pump material is got drainage to water content＜40% after mill is good, oven dry is pulverized, and crosses 80 sieves, to remove coarse granule,, weigh again afterwards to guarantee epigranular, pack drops into the ball milling operation in the 20%-30% ratio and re-uses, and adds the auxiliary material of following percentage by weight: CaCO during use
3: 0.8%-1.1%, H
3BO
3: 0.2%-0.4%, SrCO
3: 0.1%-0.3%, to reach performance requirement.
The superfluous water of discharging is collected to greasy dirt separate and subside pond in above-mentioned abrasive and the useless defective material removal process,, reuses or discharging to discharge standard through sewage disposal.
The inventor is through for many years effort, and the environmental protection that has obtained useless defective material and abrasive is reclaimed, and puies forward the new method that shelves use.The inventive method has been saved cost and has been reduced environmental pollution again, has good society and economic benefit.
Description of drawings
Fig. 1 is useless defective material and abrasive recovery schematic diagram
Wherein, each sequence number implication is as follows:
1 ball milling operation, 2 molding procedure, 3 grinding steps, 4 mattings, 5 gutters, 6 gutters, 7 gutters, 8 gutters, 9 sedimentation basins, 10 sedimentation basins, 11 sedimentation basins, 12 sedimentation basins, 13 sedimentation basins, 14 sedimentation basins, 15 gutters, 16 gutters, 17 gutters, 18 abrasive collecting pits, 19 collecting boxs, 20 ball mills, 21 oven dry, 24 greasy dirt separate tanks, 25 apparatus for treating sewage.
The specific embodiment
The environmental protection of useless defective material of Sichuan West Magnets Co., Ltd. and abrasive is reclaimed, and carries shelves and uses following (Fig. 1 is seen in technological process):
(1) recycling of abrasive
1. the abrasive and the used cooling water that produce after to the grinding of magnetic material workpiece of the equipment of grinding step 3, the water on flushing ground is discharged to 400 * 300mm through 300 * 250mm gutter, workshop and props up the gutter, and (400 * 300mm) are discharged to 4 grades of sedimentation basin 11-14 after converging again precipitates step by step through 600 * 300mm gutter 8 in the magnetic slag gutter that produces with matting 4.Wherein, prop up about 1 meter of 6 inlets, gutter at grinding step 20 purpose wire nets together are set, thick useless blank and a small amount of refuse collection that grinding step is produced exclude, and the water velocity in the preceding gutter of wire net generally adopts 0.4-0.9m/s.In that preceding 2 meters of 8 inlets are provided with 40 purpose wire nets together from the gutter, more tiny non-abrasive impurity is removed again, do not had big foreign material to guarantee the abrasive that is discharged to sedimentation basin.The 45-75 degree is generally adopted at the wire net inclination angle.
2. 84 grades of sedimentation basins that enter into 11-14 number 4 4000 * 3000 * 2000mm precipitate abrasive through the gutter.Through No. 14 sedimentation basin post precipitations, water is comparatively clean, and suspension is seldom arranged, and is recycled to grinding step 3 by water pump and uses, and unnecessary water drains into sewage disposal system 24 through 400 * 300mm gutter 16.
3. (10000 * 6000 * 15000mm) carry out drainage, precipitation weekly precipitation abrasive in 4 grades of 11-14 sedimentation basins to be evacuated to abrasive collecting pit 18 with mortar pump.Take out in the material process at mortar pump, sieve, with further removing fine impurities with 80 eye mesh screens.Treat that precipitation reaches water content＜40% an o'clock pack and piles up neatly, further drainage is so that this collecting pit abrasive water content more reaches unanimity.
4. above-mentioned pack material being dropped into ball milling operation 1 in the 30%-100% ratio utilizes again.If utilize again in 30%-40% ratio input, on technology, do not have specific (special) requirements and difficulty.But reach 100%, just bigger difficulty has been arranged.Because the magnetic material workpiece performance that grinding step is processed just differs, generally separately not strict yet, have again in grinding step 3, the mill process in inevitably, part emery wheel abrasive particle will be discharged in the abrasive, add and mixed a certain amount of other objectionable impurities in the discharge process inevitably, also have from magnetic material workpiece and grind the abrasive that gets off on quality, its performance itself is just hanged down a class than material performance.Also there is the bigger shortcoming of shrinkage factor in abrasive, and this has a significant impact guaranteeing product size.
Therefore when dropping into the regeneration product, undertaken by following technology by 40%-100%:
A feeds intake each time and must test water content, calculates abrasive weight according to water content, and accurate weighing feeds intake at every turn.
The B technical recipe will necessarily be adjusted:
CaCO
3: 0.8%-1.1%, H
3BO
3: 0.1%-0.3%, SrCO
3: 0.1%-0.3%, SrSO
4: 0.01%-0.04% or CaCO
3: 0.8%-1.1%, H
3BO
3: 0.1%-0.3%, SrCO
3: 0.1%-0.3%, Al
2(SO
4)
3: 0.01%-0.03%.
CaCO is adopted in this test
3: 1.0%, H
3BO
3: 0.3%, SrCO
3: 0.3%, A1
2(SO
4)
3: 0.02%.
The raw material of making like this can reach: Br＞400mT, and Hcb＞230kA/m, shrinkage factor also can be controlled at below 1.16 substantially, has reached most of product desired properties, the shrinkage factor requirement.Certainly, by further technical recipe, the adjustment of batching and other procedure technology condition also can be done the higher product of performance.
(2) recycling of useless defective material
Ball milling operation 1, molding procedure 2 in process of production because equipment is many, take up an area of greatly, the people is many, and technology is complicated, so the useless defective material that produces is more assorted and impurity is more relatively, therefore also cause some difficulties to recycling, only take more special the recycling measure.
1. the ball milling operation 1, and the useless defective material that molding procedure 2 produces is pooled to 7 current drainages of 600 * 300mm gutter in the suspension mode respectively with water and precipitates to 2 grades of sedimentation basin 9-10 that size is respectively 3000 * 2000 * 2000mm through 400 * 300mm gutter 5.
2. weekly the useless defective material in 9,10 two sedimentation basins is drawn to mortar pump in the collecting box 19 of 3000 * 2000 * 1200mm and carries out further drainage, precipitation.Pack is piled up behind water content＜40%.
3. the useless defective material water content of test pack is calculated 1 ton of required useless defective material weight of net weight material, grinds 1 hour in 1 ton of QM1000 type ball mill 20 of useless defective material adding of 1 ton of net weight material of weighing, will add the auxiliary material of following percentage by weight simultaneously:
CaCO
3：0.4％-0.8％+H
3BO
3：0.1％-0.2％+SrCO
3：0.1％-0.3％。
CaCO is adopted in this test
3: 0.6%+H
3BO
3: 0.1%+SrCO
3: 0.3%.
Promptly material is got drainage to the Rose Box of 2000 * 2000 * 15000mm after mill is good with inflating pump.
This step mainly solves two problems:
A adds auxiliary material, improves the performance of useless defective material.
B elimination large granular impurity, even not wear-resisting on a small quantity impurity is arranged, also pass through ball milling after, particle diminishes and is evenly distributed in the material, a part also leaches with water.
4. after having ground useless defective material water content＜40% in the Rose Box, directly ladle out, be shaped as on the coal stove 21 of square platform and toast to 5000 * 4000 * 200mm.
5. after drying fully, directly shovel out, it is broken into powder, sieve with 80 order vibratory sieves again,,, weigh pack afterwards again to remove coarse granule to guarantee epigranular with disintegrating machine.
Useless defective material after above-mentioned steps is handled drops into ball milling operation 1 in the 20%-30% ratio and re-uses.When batching, carry out the technical recipe adjustment, add: CaCO
3: 0.8%-1.1%+H
3BO
3: 0.2%-0.4%+SrCO
3: 0.1%-0.3%, to reach performance requirement.
In above-mentioned abrasive and the useless defective material removal process the superfluous water of discharging handle in 15,16, the 17 greasy dirt separate and subside ponds that drain into 4000 * 4000 * 3000mm after compiling through the gutter.Surplus a value 20, further handle in ten thousand yuan the apparatus for treating sewage again.Institute's discharge water has reached discharge standard, draws back to the part producing operation with water pump and uses.The superfluous water qualified discharge.
The Economic and Efficiency Analysis of above-mentioned recovery method:
The present annual production of Sichuan West Magnets Co., Ltd. will reach 5000 tons, will produce about 230 tons the abrasive of useless defective material and about 2050 tons every year.Past, company also was to sell (100-200 unit/ton) at a low price or dispose to useless defective material, and abrasive is a small amount of to drop into utilization again, and major part is still undersold with 800-900 unit/ton.And produce the required pre-imitation frosted glass price of magnetic material generally about 2300-2500 unit/ton.The price that the performance class is higher is taller many.
According to above-mentioned recovery, after putting forward grade using method and implementing, this part useless defective material and abrasive promptly are used as pre-imitation frosted glass and are used, and use value greatly improves.But the creation of value in every year is specially more than 2,000,000 yuan:
Useless defective material: (2300-200) unit/ton * is 230 tons=483000 yuan;
Abrasive: (2300-900) unit/ton * (2050-2050*30%) ton=2009000 yuan.
In addition, handle useless defective material and abrasive by the method after, can reduce 10 tons basic every year discharges outside factory, only this, environmental pollution promptly greatly reduces, and has obtained the good social benefit.
Claims (6)
1, the recoverying and utilizing method of abrasive or useless defective material in the magnetic material production process may further comprise the steps:
Abrasive that produces after a, the grinding of magnetic material workpiece or useless defective material are discharged to multifeed clarifier with cooling water through the gutter and precipitate step by step; Described multifeed clarifier is that 2-4 sedimentation basin precipitates successively;
B, regularly to precipitation material in each sedimentation basin collect, drainage is to water content＜40%;
C, abrasive or useless defective material that the b step is reclaimed utilize in 20%-100% ratio input ball milling operation again, will add the auxiliary material that contains following percentage by weight simultaneously:
CaCO
3：0.8％-1.1％，H
3BO
3：0.1％-0.4％，SrCO
3：0.1％-0.4％。
2, recoverying and utilizing method according to claim 1 is characterized in that:
Abrasive utilizes in 30%-100% ratio input ball milling operation again in the c step, will add the auxiliary material of following percentage by weight simultaneously:
CaCO
3: 0.8%-1.1%, H
3BO
3: 0.1%-0.3%, SrCO
3: 0.1%-0.4%, SrSO
4: 0.01%-0.04%; Or CaCO
3: 0.8%-1.1%, H
3BO
3: 0.1%-0.3%, SrCO
3: 0.1%-0.4%, Al
2(SO4)
3: 0.01%-0.03%.
3, according to the described recoverying and utilizing method of claim 1, it is characterized in that: the useless defective material of b collection step adds the auxiliary material of following percentage by weight: CaCO
3: 0.4%-0.8%, H
3BO
3: 0.1%-0.2%, SrCO
3: 0.1%-0.3%, at grinding in ball grinder 0.5-1 hour, the good back of mill drainage was to water content＜40%, and oven dry is pulverized, and crosses 80 sieves, drops into the ball milling operation in the 20%-30% ratio again and re-uses, and adds the auxiliary material of following percentage by weight: CaCO during use
3: 0.8%-1.1%, H
3BO
3: 0.2%-0.4%, SrCO
3: 0.1%-0.3%.
4, according to each described recoverying and utilizing method of claim 1-3, it is characterized in that: in a step, inlet 0.5-3 rice, gutter is provided with 1-4 road 20-40 purpose wire net, and water velocity is 0.4-0.9m/s before the wire net, and the wire net inclination angle is to use the 45-75 degree.
5, according to each described recoverying and utilizing method of claim 1-3, it is characterized in that: a step sedimentation basin specification is: 3500～5000 * 2500～3500 * 2000～2500mm.
6, according to the described recoverying and utilizing method of claim 5, it is characterized in that: a step sedimentation basin specification is: 4000 * 3000 * 2000mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100224525A CN100518967C (en) | 2006-12-08 | 2006-12-08 | Method for reutilizing waste and inferior material and grinding abrasive in magnetic material production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100224525A CN100518967C (en) | 2006-12-08 | 2006-12-08 | Method for reutilizing waste and inferior material and grinding abrasive in magnetic material production process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1994595A true CN1994595A (en) | 2007-07-11 |
| CN100518967C CN100518967C (en) | 2009-07-29 |
Family
ID=38249845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100224525A Expired - Fee Related CN100518967C (en) | 2006-12-08 | 2006-12-08 | Method for reutilizing waste and inferior material and grinding abrasive in magnetic material production process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100518967C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101120A (en) * | 2009-12-21 | 2011-06-22 | 上海爱普生磁性器件有限公司 | Method for recycling boned neodymium iron boron permanent magnet defective product |
| CN105798778A (en) * | 2016-05-09 | 2016-07-27 | 惠晶显示科技（苏州）有限公司 | Grinding powder recycling method for displaying glass plane grinding |
| CN108972320A (en) * | 2018-07-10 | 2018-12-11 | 浙江晶瑞电子材料有限公司 | A kind of filter device for sapphire wafer abrasive sand |
| CN109701716A (en) * | 2019-02-11 | 2019-05-03 | 辽宁科技大学 | A kind of processing magnetic abrasive production line and application method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076853C (en) * | 1999-01-06 | 2001-12-26 | 宁波韵升强磁材料有限公司 | Method for making Nd-Fe-B series permanent magnet by using leftover bits and pieces of material |
| CN1269587A (en) * | 1999-04-05 | 2000-10-11 | 潘树明 | Magnetic regeneration process for the waste material from the production of transition rare earth permanent-magnet and its product |
| RU2179764C2 (en) * | 2000-01-05 | 2002-02-20 | ОАО Научно-производственное объединение "Магнетон" | Method for manufacturing oxide permanent magnets from strontium ferrite wastes |
| CN1687470A (en) * | 2005-05-18 | 2005-10-26 | 西北有色金属研究院 | Method for preparing Nd-Fe-B alloys by using waste |
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2006
- 2006-12-08 CN CNB2006100224525A patent/CN100518967C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101120A (en) * | 2009-12-21 | 2011-06-22 | 上海爱普生磁性器件有限公司 | Method for recycling boned neodymium iron boron permanent magnet defective product |
| CN105798778A (en) * | 2016-05-09 | 2016-07-27 | 惠晶显示科技（苏州）有限公司 | Grinding powder recycling method for displaying glass plane grinding |
| CN108972320A (en) * | 2018-07-10 | 2018-12-11 | 浙江晶瑞电子材料有限公司 | A kind of filter device for sapphire wafer abrasive sand |
| CN109701716A (en) * | 2019-02-11 | 2019-05-03 | 辽宁科技大学 | A kind of processing magnetic abrasive production line and application method |
| CN109701716B (en) * | 2019-02-11 | 2020-08-18 | 辽宁科技大学 | Production line for processing magnetic grinding materials and using method |
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| Publication number | Publication date |
|---|---|
| CN100518967C (en) | 2009-07-29 |
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