CN113856884A - Physical purification method of coarse-grain cubic boron nitride single crystal - Google Patents
Physical purification method of coarse-grain cubic boron nitride single crystal Download PDFInfo
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- CN113856884A CN113856884A CN202110953997.2A CN202110953997A CN113856884A CN 113856884 A CN113856884 A CN 113856884A CN 202110953997 A CN202110953997 A CN 202110953997A CN 113856884 A CN113856884 A CN 113856884A
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- shaking table
- boron nitride
- cubic boron
- stirring tank
- coarse
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- 229910052582 BN Inorganic materials 0.000 title claims abstract description 28
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000000746 purification Methods 0.000 title claims abstract description 20
- 239000013078 crystal Substances 0.000 title claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 16
- 238000007873 sieving Methods 0.000 claims abstract description 14
- 238000001125 extrusion Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 41
- 238000003756 stirring Methods 0.000 claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 16
- 239000011265 semifinished product Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 230000003068 static effect Effects 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 abstract description 19
- 238000000053 physical method Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 238000009776 industrial production Methods 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 9
- 239000003513 alkali Substances 0.000 description 4
- 229940079593 drug Drugs 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 208000028571 Occupational disease Diseases 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/02—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation
- B03B5/04—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation on shaking tables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C1/00—Crushing or disintegrating by reciprocating members
- B02C1/02—Jaw crushers or pulverisers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
Abstract
The physical purification method of the coarse-grain cubic boron nitride single crystal adopts the mixed application of jaw crushing, double-roller extrusion crushing, shaking table separation, sieving and grinding, solves the problems that the traditional physical method can not separate heavy ores from light ores, and the purification by using a chemical method needs a large amount of chemicals to cause environmental pollution, waste cost and is not beneficial to industrial production, can effectively save the use of chemicals, improve labor efficiency, optimize environment and is beneficial to industrial production.
Description
Technical Field
The invention belongs to the technical field of purification of superhard materials, and particularly relates to a physical purification method of coarse-grain cubic boron nitride single crystals.
Background
Currently, cubic boron nitride single crystal products with grain sizes of less than 50 are sold/applied in the market. With the development of science and technology, the application of cubic boron nitride products is more and more extensive, the granularity of cubic boron nitride single crystal products which is required to be more and more than 50 is more and more coarse, and the demand of the product granularity of 18-50 is increasingly vigorous. At present, the cubic boron nitride with the granularity less than 50 is purified by two steps: 1, separating heavy ores and light ores by a physical method (a semi-finished product, namely a synthetic rod, is added into a stirring tank of a shaking table, the semi-finished product reacts with water (cubic boron nitride and hexagonal boron nitride are completely peeled off), and a mixture flows into the surface of the shaking table through a screen of the stirring tank); 2 removing impurities (heavy ores, namely cubic boron nitride products contain partial impurities) by a chemical method. The semi-finished product with the grain size of cubic boron nitride single crystal product larger than 50 hardly reacts with water (the synthesis rod produced by the crude process is too hard and the reaction speed with water is too slow, and the traditional method obstructs the production process), heavy ores and light ores cannot be separated by the traditional physical method, and the heavy ores and the light ores are purified by a chemical method, so that the use of a large amount of chemicals causes environmental pollution, wastes the cost and is not beneficial to industrial production. Therefore, a new physical purification method of cubic boron nitride coarse particle products is urgently needed to be found, so that the labor efficiency is improved, the labor intensity is reduced, the cost is reduced, and the environment is optimized.
Disclosure of Invention
The invention aims to provide a physical purification method of coarse-grain cubic boron nitride single crystal aiming at the defects of the prior art, which can effectively save the use of chemicals, improve the labor efficiency and optimize the environment.
In order to solve the technical problems, the invention adopts the technical scheme that:
a physical purification method of coarse-grained cubic boron nitride single crystal, comprising the steps of:
1) jaw crusher
a. Placing the cubic boron nitride synthetic rod semi-finished product into a hopper of a material conveying belt;
b. placing a receiving barrel at a discharge port of the jaw crusher, and performing sealed dust removal treatment;
c. adjusting the gap between the movable jaw plate and the static jaw plate;
d. opening a switch of the material conveying belt, simultaneously opening a switch of a jaw crusher, and carrying out jaw crushing on the semi-finished product;
2) crushing by double-roller extrusion
e. Placing the semi-finished product mixture subjected to jaw crushing into a hopper of a material conveying belt, and adjusting the vibration frequency and the blanking speed;
f. adjusting the gap between the pair rollers according to the size of the cubic boron nitride particles, and placing a receiving barrel at a discharge port below the pair rollers;
g. opening the material conveying belt and the double-roller machine, and carrying out double-roller extrusion crushing;
3) shaking table separation
h. Injecting water into a shaking table stirring tank to a quantitative position;
j. opening a shaking table stirring tank, and pouring the mixture crushed by the double rollers into the shaking table stirring tank;
k. opening a water pipe valve of the shaking table and a discharge valve of a stirring tank of the shaking table in sequence, and adjusting the water quantity;
starting a shaking table operation switch to separate the shaking tables;
4) sieving and grinding
m, opening a discharging valve arranged at the bottom of a shaking table stirring tank for discharging, and sieving the mixture;
and n, putting the mixture which does not pass through the screen into a grinding container for grinding, and then, carrying out table separation and sieving and grinding again until the mixture is completely sieved.
In order to facilitate discharging, the discharging valve is arranged at a position 10-20 cm away from the bottom of the shaking table stirring tank.
Furthermore, the discharge valve is arranged at a position 15cm away from the bottom of the shaking table agitator tank.
And an upper screen is arranged on the inner side of the discharge valve.
The invention has the beneficial effects that:
(1) the physical purification method of the coarse-particle cubic boron nitride single crystal adopts the mixed application of jaw crushing, roller pair extrusion crushing, shaking table separation, sieving and grinding, solves the problems that heavy ores and light ores cannot be separated by the traditional physical method, and the problems that environmental pollution, cost waste and industrial production are not facilitated due to the fact that a large amount of chemical medicines are needed to be used for purification by using a chemical method, can effectively save the use of chemicals, improves the labor efficiency, optimizes the environment and is beneficial to industrial production.
(2) A large amount of chemical medicines are saved, and the physical purification method only needs to be boiled once for subsequent chemical treatment, so that the use of the chemical medicines is reduced;
(3) production operation steps are reduced, and labor intensity is reduced;
(4) the self-sharpening property of the product is maintained;
(5) the working environment is optimized, the pollution of noise, acid mist, dust and the like to the environment is reduced, meanwhile, the working environment of the staff is improved, the morbidity of occupational diseases is reduced, and the safety production coefficient of the staff is improved;
(6) the use of energy is reduced, and a large amount of energy such as water, electricity and the like is saved.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The invention provides a physical purification method of coarse-grain cubic boron nitride single crystal, which comprises the following steps:
1) jaw crusher
a. Placing the cubic boron nitride synthetic rod semi-finished product into a hopper of a material conveying belt;
b. placing a receiving barrel at a discharge port of the jaw crusher, and performing sealed dust removal treatment;
c. adjusting the gap between the movable jaw plate and the static jaw plate;
d. opening a switch of the material conveying belt, simultaneously opening a switch of a jaw crusher, and carrying out jaw crushing on the semi-finished product;
2) crushing by double-roller extrusion
e. Placing the semi-finished product mixture subjected to jaw crushing into a hopper of a material conveying belt, and adjusting the vibration frequency and the blanking speed;
f. adjusting the gap between the pair rollers according to the size of the cubic boron nitride particles, and placing a receiving barrel at a discharge port below the pair rollers;
g. opening the material conveying belt and a starting switch of the double-roller machine, and carrying out double-roller extrusion crushing;
3) shaking table separation
h. Injecting water into a shaking table stirring tank to a quantitative position;
j. opening a stirring switch of a shaking table stirring tank, and pouring the mixture crushed by the double rollers into the shaking table stirring tank;
k. opening a water pipe valve of the shaking table and a discharge valve of a stirring tank of the shaking table in sequence, and adjusting the water quantity; in the embodiment, the discharge valve is arranged at a position 10-20 cm away from the bottom of the shaking table stirring tank; preferably, the discharge valve is arranged at a position 15cm away from the bottom of the shaking table agitator tank, and meanwhile, an upper screen is arranged on the inner side of the discharge valve to screen materials;
starting a shaking table operation switch to separate the shaking tables;
4) sieving and grinding
m, opening a discharging valve arranged at the bottom of a shaking table stirring tank for discharging, and sieving the mixture;
and n, putting the mixture which does not pass through the screen into a grinding container for grinding, and then, carrying out table separation and sieving and grinding again until the mixture is completely sieved.
The present invention will be described in further detail with reference to examples.
Example 1
In this example, a synthetic rod (phi 40 × 10 mm) of the type 230 cubic boron nitride (hereinafter abbreviated as CBN) was taken, the peak particle size was 18/20, and the rod was placed in a hopper of a material conveyor belt of a jaw crusher; adjusting the clearance (10-40 mm) between the dynamic and static parts of the jaw crusher and the range (less than or equal to 6 mm) of a discharge port, opening a switch of a material conveyor belt, and simultaneously opening a switch of the jaw crusher for crushing; and placing the crushed materials into a hopper of a material conveying belt of a double-roller machine, adjusting the vibration frequency and the blanking speed, and carrying out extrusion crushing, wherein the particle size of the crushed materials is less than or equal to 1.5 mm.
Installing a 12-mesh upper screen on the inner side of a discharge valve 15cm away from the bottom of a shaker stirring tank, pouring materials crushed by double rollers into the shaker stirring tank by using a lifting machine, and opening the shaker stirring tank and a shaker switch to carry out shaker separation; the material that did not pass through the upper screen was placed in a grinding vessel (grinding bar or basin) for grinding, followed by shaker separation and sieving and grinding until completely sieved.
Then, the materials enter a chemical impurity removal process, and are treated by the physical purification method, so that the impurities are less, and only alkali is needed to be boiled once. The traditional physical method is that the CBN230 synthesis rod is directly added into a shaking table stirring tank, water is added for stirring for 3 hours, and then shaking table separation is carried out; since the synthetic rod is too hard, the coarser the peak particle size, the harder the synthetic rod, hardly reacts with water and cannot be purified by conventional methods.
Example 2
In this example, a synthetic rod of the CBN282 variety (phi 48 x 12 mm) with a peak particle size of 40/50 was taken and placed into the hopper of the material conveyor of a jaw crusher; adjusting the clearance (12-50 mm) between the dynamic and static parts of the jaw crusher and the range (less than or equal to 6 mm) of a discharge port, opening a switch of a material conveyor belt, and simultaneously opening a switch of the jaw crusher for crushing; and (3) placing the crushed materials into a hopper of a material conveying belt of a double-roller machine, adjusting the vibration frequency and the blanking speed, and performing extrusion crushing (the particle size of the crushed materials is less than or equal to 1 mm).
A 20-mesh upper screen is arranged on the inner side of a discharge valve (15 cm away from the bottom) of a shaking table stirring tank, materials crushed by the pair rollers are poured into the stirring tank by a lifter, and the stirring tank and a shaking table switch are opened to carry out shaking table separation; and (4) putting the materials which do not pass through the screen of the stirring tank into a grinding container for grinding, and then carrying out table separation, sieving and grinding until the materials are completely sieved.
Then the material enters a chemical impurity removal process, and the impurities are treated by the physical purification method, and only one-time alkali boiling is needed for the impurities, wherein the traditional physical method is to directly add the CBN282 synthetic rod into a shaking table stirring tank, add water and stir for 3 hours, and then start shaking table separation. Because the synthetic rod is hard and does not react with water sufficiently, the acid and the alkali can reach the acceptance standard only by boiling for at least three times.
Example 3
In this example, a composite rod (phi 48 × 12 mm) of the CBN115 variety with a peak particle size of 30/40 was taken and placed in the hopper of the material conveyor of a jaw crusher; adjusting the clearance (12-50 mm) between the dynamic and static balance of the jaw crusher and the range (less than or equal to 6 mm) of a discharge port, opening a switch of a material conveyor belt and simultaneously opening a switch of the jaw crusher for crushing; placing the crushed materials into a hopper of a material conveying belt of a double-roller machine, adjusting the vibration frequency and the blanking speed, and carrying out extrusion crushing (the particle size of the crushed materials is less than or equal to 1 mm); a 12-mesh upper screen is arranged on the inner side of a discharge port valve (15 cm away from the bottom) of a shaking table stirring tank, materials crushed by double rollers are poured into the stirring tank by a lifter, and the stirring tank and a shaking table switch are opened to carry out shaking table separation; and (4) putting the materials which do not pass through the screen of the stirring tank into a container for grinding, and then carrying out table separation, sieving and grinding until the materials are completely sieved.
Then the material enters a chemical impurity removal process and is treated by the physical purification method; the materials separated by the shaking table enter a chemical impurity removal process, impurities are less, only one time of alkali is needed, and the traditional physical and chemical purification method is difficult to reach the acceptance standard.
Remarking: the product detection method after chemical impurity removal adopts JB/T13306-2017 and JB/T3914-2012; according to the standard: GB/T6408-2018 and enterprise symbol Q/ZNJT 01-2018.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents.
Claims (4)
1. A method for physically purifying a coarse-grained cubic boron nitride single crystal, comprising the steps of:
1) jaw crusher
a. Placing the cubic boron nitride synthetic rod semi-finished product into a hopper of a material conveying belt of a jaw crusher;
b. placing a receiving barrel at a discharge port of the jaw crusher, and performing sealed dust removal treatment;
c. adjusting the gap between the movable jaw plate and the static jaw plate;
d. opening a switch of the material conveying belt, simultaneously opening a switch of a jaw crusher, and carrying out jaw crushing on the semi-finished product;
2) crushing by double-roller extrusion
e. Placing the semi-finished product mixture subjected to jaw crushing into a hopper of a material conveying belt of a double-roller machine, and adjusting the vibration frequency and the blanking speed;
f. adjusting the gap between the pair rollers according to the size of the cubic boron nitride particles, and placing a receiving barrel at a discharge port below the pair rollers;
g. opening the material conveying belt and the double-roller machine, and carrying out double-roller extrusion crushing;
3) shaking table separation
h. Injecting water into a shaking table stirring tank to a quantitative position;
j. opening a stirring switch of a shaking table stirring tank, and pouring the mixture crushed by the double rollers into the shaking table stirring tank;
k. opening a water pipe valve of the shaking table and a discharge valve of a stirring tank of the shaking table in sequence, and adjusting the water quantity;
starting a shaking table operation switch to separate the shaking tables;
4) sieving and grinding
m, opening a discharging valve arranged at the bottom of a shaking table stirring tank for discharging, and sieving the mixture;
and n, putting the mixture which does not pass through the screen into a grinding container for grinding, and then, carrying out table separation and sieving and grinding again until the mixture is completely sieved.
2. The physical purification method of a coarse-grained cubic boron nitride single crystal according to claim 2, characterized in that: and the discharge valve is arranged at a position 10-20 cm away from the bottom of the shaking table stirring tank.
3. The physical purification method of a coarse-grained cubic boron nitride single crystal according to claim 2, characterized in that: the discharging valve is arranged at a position 15cm away from the bottom of the shaking table stirring tank.
4. The physical purification method of a coarse-grained cubic boron nitride single crystal according to claim 1, characterized in that: and an upper screen is arranged on the inner side of the discharge valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110953997.2A CN113856884A (en) | 2021-08-19 | 2021-08-19 | Physical purification method of coarse-grain cubic boron nitride single crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110953997.2A CN113856884A (en) | 2021-08-19 | 2021-08-19 | Physical purification method of coarse-grain cubic boron nitride single crystal |
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| Publication Number | Publication Date |
|---|---|
| CN113856884A true CN113856884A (en) | 2021-12-31 |
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| CN202110953997.2A Pending CN113856884A (en) | 2021-08-19 | 2021-08-19 | Physical purification method of coarse-grain cubic boron nitride single crystal |
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2021
- 2021-08-19 CN CN202110953997.2A patent/CN113856884A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1221654A (en) * | 1998-10-16 | 1999-07-07 | 荣葵一 | Wetting gravity ore dressing tech. of asbestos ore |
| CN202022751U (en) * | 2011-01-28 | 2011-11-02 | 河南金渠黄金股份有限公司 | Feeding device for shaking table |
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| US9156035B1 (en) * | 2012-01-31 | 2015-10-13 | ASR Holding Company | Method for progressive separation and extraction of raw materials from residential roofing products |
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Application publication date: 20211231 |