CN1416960A - Method and device for eliminating large particle in fine powder for grinding material and grinding apparatus - Google Patents
Method and device for eliminating large particle in fine powder for grinding material and grinding apparatus Download PDFInfo
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- CN1416960A CN1416960A CN 01127585 CN01127585A CN1416960A CN 1416960 A CN1416960 A CN 1416960A CN 01127585 CN01127585 CN 01127585 CN 01127585 A CN01127585 A CN 01127585A CN 1416960 A CN1416960 A CN 1416960A
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Abstract
The device for eliminating large particle in fine powder includes two overflow grading tanks connected serially. After the material slurry to be treated is fed into the first overflow grading tank, clear water is injected in great flow rate to float the slurry until the slurry level reaches one first overflow port. The flow rate is then regulated to a relatively lower value, so that the slurry overflows from the first overflow grading tank to the second overflow grading tank to complete equal-flow rate overflow grading operation and obtain slurry product without large particle.
Description
Technical field
The present invention relates to stage division and the device of a kind of grinding materials and grinding tool, particularly relate to a kind of overflow hydraulic elutria-tion method that utilizes and eliminate method and the device of grinding materials and grinding tool with big grain in the micro mist with micro mist.
Background technology
Grinding materials and grinding tool is meant the granularity group that particle diameter is very thin and have very strict size dimension scope to be connected continuously mutually with micro mist.In grain size is the 63-0.5 mu m range, according to the regulation of various countries' industrial standard, be divided into be 11-22 granularity specification, mark be F or # (number).Because this product whole particles when using all will be used for grinding, polishing article, and each particle all will be crushed by external force, also plays delineation, grinding, polishing action just in the process that each particle is crushed by external force.If the size of this product is irregular, do not go out even and level and smooth new surface with regard to grinding and polishing.If there is bulky grain to exist in this product, not only grinding and polishing does not go out neat new surface, but also many " lines " are marked on new surface, makes by the grinding and polishing object and scraps, and causes enormous economic loss.Because the particle of this product is very thin and the specification boundary line is very narrow, be difficult to carry out classification with the mesh screen point-score, more general employing the method for hydraulic classiciation.Ceng Youyong vortex method, centrifugal pneumatic concentration and audio frequency vibration method were carried out classification test, but owing to the effectiveness of classification difference is not succeeded.The most frequently used hydraulic classification method has two kinds of sedimentation and presss over system, and because sedimentation is simple and easy, small investment, goes up detective, so that China carries out the producer of classification with sedimentation at present is more.Product quality, kind and the specification etc. of Japan are preferably also to be the maximum country of output in the world at present, have almost occupied whole markets, the world.According to the preliminary statistics, Japan has 8-10 micro mist factory approximately, and the gross annual output amount is about more than 50,000 tons, and production method is a press over system.But use the conclusion of Japanese micro mist to be according to China's precise finiss, polishing plant: being not can not to be waste product, is minimum, at present in the world also not than the better micro mist product of japanese product.
The principle of sedimentation and press over system hydraulic classiciation is according to same proportion and the different sinking speed of particle in water of diameter is variant, the sinking speed that particle diameter is big is fast, the sinking speed that particle diameter is little is slow, promptly utilize the sinking speed difference to carry out grading, the theoretical value of its sinking speed is calculated by Stokes formula, but the data that are used for actual production are through overcorrect and corrected.The sedimentation hydraulic classiciation is with proportion is identical and the material that particle diameter varies in size, (solid material is about 40%) is mixed into slip with water by a certain percentage of the weight, according to the slip weight that the size of vessel volume is calculated, be placed in the container of a round barrel shape (have use ceramic vat).According to the height of container, set the height (suction head) of certain absorption slip, this suction head is exactly a sedimentation hydraulic elutria-tion method take the altitude.Particle (the d of each granularity specification
s50 values) sinking speed of diameter dimension is removed legal sedimentation suction head, just draws the required sedimentation time, when arriving the sedimentation time, with the method sucking-off of the slip in the container with siphon, puts into container finished product for it.Legal suction head generally is about 0.6 of a container total height.The press over system hydraulic classiciation is identical with the mechanism of sedimentation hydraulic classiciation, institute's difference is that pulp density is low than sedimentation, solid material accounts for and is about outside about 20%, use ascending current greater than the granularity specification particle sinking speed of being told, desired particle overflowed have outside the conical circular overflow ladle, reach the purpose of classification.During the press over system hydraulic classiciation, it is the upwards flowing water flow of in overflow ladle, introducing certain flow, when the speed of current equals the sinking speed of the granularity specification particle that obtains of requiring, it is motionless in the overflow size separation bucket that this particle is detained (suspension), the speed of current is during greater than the sinking speed of this particle, just the current that risen overflow outside the bucket, reach the purpose of classification.Awarding the flow velocity and the flow of the ascending current in the overflow ladle, is to be supplied with by flowmeter or flow pump.
Because the sinking speed theory of using is a Stokes formula, and the condition of this theoretical formula is: the simple grain spherical particle, in infinitely-great container, do free settling, it is the not interference of receptor inwall of particle of free settling, there is not other phase mutual interference yet, only relevant with the viscosity resistance of liquid (water).And it is actual in carrying out the hydraulic classiciation production process, the influence of particle sinking speed receptor inwall, influenced by grain shape, be subjected to influence because of the sinking speed difference of particle diameter size generation, be subjected to the influence of concentration of solid particles, be subjected to be subjected to the influence of fluctuating temperature because of the impure influence of particulate mineral, be subjected to influence of ascending current fluctuation or the like, with theoretical calculating bigger difference arranged so produced production practices.Factory has adopted integrated calibration coefficient and multiple technologies measure to solve this problem.As selected, but, wherein mainly be, do not eradicate big grain because of the big influence of pulp density all because of the multiple factors of deposition velocity that influences is arranged for twice of sedimentation hydraulic classiciation employing or multiple fractionation.For the press over system hydraulic classiciation, exist the above-mentioned multiple factor that influences particle sinking speed equally, again since the press over system hydraulic classiciation to be difficult to carry out second time selected, so do not eradicate big yet.
Summary of the invention
The purpose of this invention is to provide a kind of method and the device thereof that can eliminate grinding materials and grinding tool with big grain in the micro mist.
For achieving the above object, the technical solution used in the present invention is: a kind of method that can eliminate grinding materials and grinding tool with big grain in the micro mist, two overflow size separation buckets are connected in series with pipeline is closed circuit, will be through broken, chemical treatment (comprises acid, alkali cleaning) and the segmentation choosing former slip after dividing add after an amount of dispersant stirs certain hour, join in first overflow size separation bucket with measuring pump, after waiting to add enough slips, use greater than the required flow of institute's graded particie and replenish clear water rapidly, purpose is that slip is more fully suspended, the liquid level for the treatment of barrel interior slip reaches before the overflow outlet of overflow size separation bucket soon, flow is adjusted to the required flow of normal overflow size separation, carry out normal overflow size separation operation.Treat that first overflow size separation bucket will begin to overflow before the semi-finished product slip, the feed liquor valve of filling second overflow size separation bucket of clear water is in advance opened, the semi-finished product slip that overflows from first overflow size separation bucket can wait second the overflow size separation bucket that pass through of flow, at this moment pulp density is very low, reaches the condition of freely falling body substantially.Although the flow velocity of second overflow size separation bucket is very fast thus, calculating second the overflow size separation bucket that is determined according to selected arbitrarily big grain particle diameter size value fully can be big heavy the collection.Because the volume of selected big grain is than the big 4-6 of volume times of standard particle size particle, so can eliminate selected arbitrarily big grain in the high concentration overflow size separation.
The above-mentioned former slip concentration that joins in first overflow size separation bucket can reach 30%-50%.
The grinding materials and grinding tool of eliminating provided by the invention is that two overflow size separation buckets are connected in series with pipeline is closed circuit with the device of big grain in the micro mist.
In said method provided by the invention and the device, the diameter of first overflow size separation bucket is more than or equal to the diameter of second overflow size separation bucket, and the overflow of first barrel outlet is higher than the overflow outlet of second bucket.First overflow size separation bucket overflow outlet exports high 1-6m than the overflow of second overflow size separation bucket.
The cylinder height of described overflow size separation bucket: cylinder interior diameter=1: 1-2: 1, the cone angle of overflow size separation bucket is 24 °-35 °, the internal diameter ratio of two overflow size separation buckets is 1: 1-2: 1.
The grinding materials and grinding tool of producing with method and apparatus of the present invention is with the big grain that does not play fatal destructive " drawing line " in the micro mist, therefore the product of forming by unusual uniform grain sizes can guarantee to be ground, the extra accuracy requirement and the high workpiece grinding and polishing processed finished products rate of polishing workpiece, reduce the grinding and polishing processing cost, improved the social technology economic benefit.When carrying out overflow size separation with method of the present invention, former slip concentration can be brought up to more than the 30-50% from present 24%, so production efficiency can be enhanced about more than once, production cost descends about more than 1/3.It is also very simple with the required device fabrication of micro mist to produce grinding materials and grinding tool with method of the present invention, and technology is grasped easily, and human factor is few, so product granularity has been formed control.
The specific embodiment
Two overflow size separation buckets are connected in series with pipeline is closed circuit, the overflow outlet of first overflow size separation bucket exports high 1-6m than the overflow of second overflow size separation bucket, the diameter of first overflow size separation bucket is more than or equal to the diameter of second overflow size separation bucket, and its interior diameter ratio is 1: 1-2: 1.The cylinder height of two overflow size separation buckets: the cylinder interior diameter is 1: 1-2: the cone angle of 1, two overflow size separation bucket is 24 °-35 °.
Below in conjunction with several example explanation the inventive method.
Example 1: intend producing with method of the present invention the grinding materials and grinding tool micro mist of 10000#, requirement is greater than 3 μ m but equal zero smaller or equal to the bulky grain of 4.5 μ m, more than or equal to 0.5 μ m but reach more than 94% smaller or equal to the particle of 3 μ m.Selecting first overflow size separation bucket cylinder diameter for use is that 1500mm, cylinder height are 3000mm, cone angle is 24 °, second overflow size separation bucket cylinder diameter is 800mm, cylinder height is 800mm, cone angle is 28 °, adding concentration is 30% slip 4000kg-5500kg, carry out the closed circuit flow overflow size separation that waits with the flow of 23kg per hour, from second overflow size separation bucket, overflow the finished product slip, verify as through carrying out granularmetric composition: greater than the promptly big grain of the particle of 3 μ m is zero, more than or equal to 0.5 μ m but account for 98% smaller or equal to the particle of 3 μ m.
Example 2: the micro mist of intending producing 6000#.Requirement is greater than 5 μ m but equal zero smaller or equal to the bulky grain of 8 μ m, more than or equal to 0.8 μ m but reach more than 94% smaller or equal to the particle of 5 μ m.Parameters is consistent with the parameter of example 1, only flow is adjusted to per hour 64kg, wait the flow overflow size separation, from second overflow size separation bucket, overflow the finished product slip, verify as through carrying out granularmetric composition: greater than the promptly big grain of the particle of 5 μ m is zero, more than or equal to 0.8 μ m but account for 96% smaller or equal to the particle of 5 μ m.
Example 3: intend producing with the inventive method the grinding materials and grinding tool micro mist of 2000#, requirement is greater than 17 μ m but equal zero smaller or equal to the bulky grain of 19 μ m, more than or equal to 4 μ m but reach more than 94% smaller or equal to the particle of 17 μ m.Selecting first overflow size separation bucket cylinder diameter for use is that 1100mm, cylinder height are 2200mm, cone angle is 28 °, second overflow size separation bucket cylinder diameter is 700mm, cylinder height is 700mm, cone angle is 30 °, adding concentration is 40% slip 2000kg, carry out the closed circuit flow overflow size separation that waits with the flow of 500kg per hour, from second overflow size separation bucket, overflow the finished product slip, verify as through carrying out granularmetric composition: greater than 17 μ m but smaller or equal to the promptly big grain of the particle of 19 μ m is zero, more than or equal to 4 μ m but account for 97% smaller or equal to the particle of 17 μ m.
Example 4: intend producing with the inventive method the grinding materials and grinding tool micro mist of 500#, requirement is greater than 50 μ m but equal zero smaller or equal to the bulky grain of 63 μ m, more than or equal to 16 μ m but reach more than 94% smaller or equal to the particle of 50 μ m.Selecting first overflow size separation bucket cylinder diameter for use is 800mm, cylinder height is 1600mm, cone angle is 30 °, second overflow size separation bucket cylinder diameter is 550mm, cylinder height is 600mm, cone angle is 35 °, adding concentration is 50% slip 1000kg, carry out the closed circuit flow overflow size separation that waits with the flow of 2620kg per hour, from second overflow size separation bucket, overflow the finished product slip, verify as through carrying out granularmetric composition: greater than 50 μ m but smaller or equal to the promptly big grain of the particle of 63 μ m is zero, more than or equal to 16 μ m but account for 97% smaller or equal to the particle of 50 μ m.
Claims (9)
1, a kind of method of eliminating grinding materials and grinding tool with big grain in the micro mist, it is characterized in that, two overflow size separation buckets are connected in series with pipeline is closed circuit, treated former slip is joined in first overflow size separation bucket, after waiting to add enough slips, use greater than the required flow of institute's graded particie and replenish clear water rapidly, slip is suspended fully, before the liquid level for the treatment of barrel interior slip will reach the overflow outlet of first overflow size separation bucket, flow is adjusted to the required flow of normal overflow size separation, the semi-finished product slip that overflows is entered fill in advance second overflow size separation bucket of clear water from first overflow size separation bucket, wait the operation of flow overflow size separation, do not contain big grain in the gained finished product slip.
2, the method for claim 1 is characterized in that, the diameter of first overflow size separation bucket is more than or equal to the diameter of second overflow size separation bucket, and the overflow of first barrel outlet is higher than the overflow outlet of second bucket.
3, method as claimed in claim 1 or 2 is characterized in that, the former slip concentration that joins in first overflow size separation bucket is 30%-50%.
4, method as claimed in claim 2 is characterized in that, first overflow size separation bucket overflow outlet exports high 1-6m than the overflow of second overflow size separation bucket.
5, method as claimed in claim 2 is characterized in that, the cylinder height of described overflow size separation bucket: cylinder interior diameter=1: 1-2: 1, and the cone angle of overflow size separation bucket is 24 °-35 °, the internal diameter ratio of two overflow size separation buckets is 1: 1-2: 1.
6, a kind of device of realizing the described method of claim 1 is characterized in that, two overflow size separation buckets are connected in series with pipeline is closed circuit.
7, device as claimed in claim 6 is characterized in that, the diameter of first overflow size separation bucket is more than or equal to the diameter of second overflow size separation bucket, and the overflow of first barrel outlet is higher than the overflow outlet of second bucket.
8, device as claimed in claim 7 is characterized in that, first overflow size separation bucket overflow outlet exports high 1-6m than the overflow of second overflow size separation bucket.
9, device as claimed in claim 7 is characterized in that, the cylinder height of described overflow size separation bucket: cylinder interior diameter=1: 1-2: 1, and the cone angle of overflow size separation bucket is 24 °-35 °, the interior diameter ratio of two overflow size separation buckets is 1: 1-2: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011275855A CN1194819C (en) | 2001-10-30 | 2001-10-30 | Method and device for eliminating large particle in fine powder for grinding material and grinding apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011275855A CN1194819C (en) | 2001-10-30 | 2001-10-30 | Method and device for eliminating large particle in fine powder for grinding material and grinding apparatus |
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| Publication Number | Publication Date |
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| CN1416960A true CN1416960A (en) | 2003-05-14 |
| CN1194819C CN1194819C (en) | 2005-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011275855A Expired - Fee Related CN1194819C (en) | 2001-10-30 | 2001-10-30 | Method and device for eliminating large particle in fine powder for grinding material and grinding apparatus |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102247929A (en) * | 2011-07-01 | 2011-11-23 | 上海江信超硬材料有限公司 | Method for water circulation of finished materials of diamond micropowder grader |
| CN102788743A (en) * | 2012-07-23 | 2012-11-21 | 辽宁科技大学 | Elutriation device |
| CN103028482A (en) * | 2012-12-21 | 2013-04-10 | 无锡晨旸科技股份有限公司 | Alumina micropowder production process |
| CN103394407A (en) * | 2013-08-08 | 2013-11-20 | 连云港海蓝研磨材料有限公司 | Precise and efficient overflow classifying technology |
| CN103495505A (en) * | 2013-10-10 | 2014-01-08 | 安化县众旺钨业有限公司 | Floatation method of diamonds and application to separation and purification of artificial diamonds from grinding waste materials thereof |
| CN104384012A (en) * | 2014-12-08 | 2015-03-04 | 宝丰恒瑞新材料有限公司 | Silicon carbide edge material large particle sedimentation device |
| CN109956475A (en) * | 2017-12-23 | 2019-07-02 | 大连天宏硼业有限公司 | A kind of method of purification of boron carbide powder |
-
2001
- 2001-10-30 CN CNB011275855A patent/CN1194819C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102247929A (en) * | 2011-07-01 | 2011-11-23 | 上海江信超硬材料有限公司 | Method for water circulation of finished materials of diamond micropowder grader |
| CN102788743A (en) * | 2012-07-23 | 2012-11-21 | 辽宁科技大学 | Elutriation device |
| CN102788743B (en) * | 2012-07-23 | 2014-04-09 | 辽宁科技大学 | Elutriation device |
| CN103028482A (en) * | 2012-12-21 | 2013-04-10 | 无锡晨旸科技股份有限公司 | Alumina micropowder production process |
| CN103028482B (en) * | 2012-12-21 | 2014-11-19 | 无锡晨旸科技股份有限公司 | Alumina micropowder production process |
| CN103394407A (en) * | 2013-08-08 | 2013-11-20 | 连云港海蓝研磨材料有限公司 | Precise and efficient overflow classifying technology |
| CN103394407B (en) * | 2013-08-08 | 2015-07-15 | 连云港海蓝研磨材料有限公司 | Precise and efficient overflow classifying technology |
| CN103495505A (en) * | 2013-10-10 | 2014-01-08 | 安化县众旺钨业有限公司 | Floatation method of diamonds and application to separation and purification of artificial diamonds from grinding waste materials thereof |
| CN103495505B (en) * | 2013-10-10 | 2015-05-27 | 安化县众旺钨业有限公司 | Floatation method of diamonds and application to separation and purification of artificial diamonds from grinding waste materials thereof |
| CN104384012A (en) * | 2014-12-08 | 2015-03-04 | 宝丰恒瑞新材料有限公司 | Silicon carbide edge material large particle sedimentation device |
| CN104384012B (en) * | 2014-12-08 | 2016-08-03 | 宝丰恒瑞新材料有限公司 | A kind of silicon carbide blade material bulky grain sedimentation device |
| CN109956475A (en) * | 2017-12-23 | 2019-07-02 | 大连天宏硼业有限公司 | A kind of method of purification of boron carbide powder |
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| Publication number | Publication date |
|---|---|
| CN1194819C (en) | 2005-03-30 |
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