CN108837926B

CN108837926B - Production line and production method for producing single-specification cutting edge materials

Info

Publication number: CN108837926B
Application number: CN201810641354.2A
Authority: CN
Inventors: 吴猛
Original assignee: Zigong Fengrui New Materials Co ltd
Current assignee: Zigong Fengrui New Materials Co ltd
Priority date: 2018-06-21
Filing date: 2018-06-21
Publication date: 2020-10-02
Anticipated expiration: 2038-06-21
Also published as: CN108837926A

Abstract

The invention belongs to the technical field of blade material production, and particularly relates to a production line and a production method for producing single-specification blade materials. Aiming at the defects that the prior art for producing the cutting edge material has to produce the cutting edge materials with various specifications at the same time, which causes the reduction of production efficiency and the waste of raw materials, the technical proposal of the invention is as follows: the device comprises a crushing device, an air classifier, a pulping tank, a purification tank, an overflow classifier and a milling device which are sequentially connected, wherein a material circulating pipe I is arranged between the crushing device and a discharge port at the lower part of the air classifier; the overflow classifier comprises a first overflow classifier and a second overflow classifier, a feed inlet of the first overflow classifier is communicated with the purification tank, a discharge outlet at the lower part of the first overflow classifier is communicated with a feed inlet of the second overflow classifier, a discharge outlet at the lower part of the second overflow classifier is communicated with the grinding device, and a discharge outlet of the grinding device is communicated with a feed inlet of the first overflow classifier through a material circulating pipe II. The invention is suitable for the production of cutting edge materials.

Description

Production line and production method for producing single-specification cutting edge materials

Technical Field

The invention belongs to the technical field of blade material production, and particularly relates to a production line and a production method for producing single-specification blade materials.

Background

The crystal silicon wafer cutting edge material means that the edge material of the cutting machine is a crystal silicon wafer. The cutting method is mainly applied to cutting of solar silicon wafers and semiconductor wafers, and is one of three major consumable items for linear cutting of the silicon wafers at present. In the process of online cutting, sand mixed by cutting fluid (usually polyethylene glycol) and cutting edge materials is sprayed on a wire mesh consisting of fine steel wires, and the cutting edge materials in mortar and the surfaces of silicon rods or silicon ingots tightly pressed on the wire mesh are ground at high speed through the high-speed movement of the fine steel wires.

The existing cutting material production process generally comprises the following steps: crushing, pulping, purifying, grading, dehydrating, drying and the like. Wherein, the classification is to divide the prepared blade material powder according to the particle size to form blade material products with various specifications. The cutting edge material is produced by using high-quality raw materials, preferably green silicon carbide. The green silicon carbide is prepared by using petroleum coke and high-quality silica as main raw materials, adding salt as an additive and smelting in a resistance furnace at high temperature, and the smelted crystal has high purity and high hardness, the hardness is between that of corundum and diamond, and the mechanical strength is higher than that of corundum.

The existing cutting edge material production process has the defect that a plurality of batches of products with different specifications are required to be separated in the classification process due to the large difference of the particle sizes of the cutting edge materials generated by crushing. Because the existing air flow or overflow grading equipment can only separate the cutting edge materials with one specification at a time, the grading time is long because the grading treatment is carried out on the same batch of products for a plurality of times in the grading process, and the production efficiency and the continuity are greatly reduced. In addition, the existing process necessarily needs to produce the cutting edge materials with various specifications at the same time, all raw materials cannot be used for producing the cutting edge materials with the same specification, and a large amount of raw materials are wasted on the premise that only one cutting edge material with a certain specification is required.

Disclosure of Invention

Aiming at the defects that the prior art for producing the cutting edge materials has to produce the cutting edge materials with various specifications at the same time, which causes the reduction of production efficiency and the waste of raw materials, the invention provides a production line and a production method for producing the cutting edge materials with single specification, and the production line and the production method aim at comprising the following steps: the single-specification cutting edge material production is realized in the process flow, so that the production flow efficiency is higher, the continuity is stronger, and the utilization rate of raw materials is higher.

The technical scheme adopted by the invention is as follows:

a production line for producing single-specification cutting materials comprises a crushing device, an air classifier, a pulping tank, a purification tank, an overflow classifier and a milling device which are sequentially connected, wherein a material circulating pipe I is arranged between the crushing device and a discharge port at the lower part of the air classifier; the overflow classifier comprises a first overflow classifier and a second overflow classifier, a feed inlet of the first overflow classifier is communicated with the purification tank, a discharge outlet at the lower part of the first overflow classifier is communicated with a feed inlet of the second overflow classifier, a discharge outlet at the lower part of the second overflow classifier is communicated with the grinding device, and a discharge outlet of the grinding device is communicated with a feed inlet of the first overflow classifier through a material circulating pipe II.

After the technical scheme is adopted, the blocky green silicon carbide is crushed into powder in a crushing device. Firstly, separating particles with large particle size and particles with small particle size in the powder prepared by crushing through air flow classification, sending powder particles with small particle size meeting the process requirements into a pulping pool for pulping, and sending powder particles with large particle size not meeting the process requirements into a crushing device for crushing again. Therefore, after the crushing process is finished, the output powder particles are all powder particles with small particle size meeting the process requirements. After the processes of pulping and purification are sequentially carried out, the obtained pulp is subjected to overflow classification treatment. In the conventional process, overflow classification is used for separating powder in slurry into a plurality of batches with different specifications according to different particle sizes. However, in the present technical solution, the overflow classification only outputs the powder within a certain particle size range as a product, the powder with a particle size higher than the process requirement is sent to the milling device for milling, the milled powder is subjected to overflow classification again, and the above process is repeated until all the powder in the slurry is broken into powder with the same specification and meeting the process requirement. Through the process, the single-specification cutting edge material production is realized in the process flow, the cutting edge material with the unnecessary specification is prevented from being produced, and the utilization rate of the raw material is higher. In addition, the working mode of the overflow grading device is changed from a mode of separating powder with various specifications by changing the water inlet speed in the traditional process into a mode of separating powder with one specification by keeping the water inlet speed constant, so that the production flow has higher efficiency and stronger continuity.

Preferably, the air classifier comprises a first air classifier and a second air classifier, a feed inlet of the first air classifier is communicated with a discharge outlet of the crushing device, a discharge outlet at the upper part of the first air classifier is communicated with a feed inlet of the second air classifier, a discharge outlet at the lower part of the first air classifier is communicated with the material circulation pipe I through a discharge pipe I, a discharge outlet at the lower part of the second air classifier is communicated with the discharge pipe I through a discharge pipe II, and a discharge outlet at the upper part of the second air classifier is communicated with the pulping tank.

After the preferred scheme is adopted, the airflow classifier is divided into two stages, so that the classification of the powder is more sufficient. The air flow velocity in the first air flow classifier is higher than that of the second air flow classifier, powder is separated step by step through two different air flow velocities, and the problem that particles which are not in line with the process requirements are output from wrong discharge ports due to the fact that the large particles and the small particles are mixed and bonded with each other and are not dispersed for enough time is avoided.

Further preferred, still be connected with waste material discharge pipe I on the discharging pipe I, be provided with vacuum pump I between discharging pipe I and the material circulating pipe I, be provided with vacuum pump II between discharging pipe I and the waste material discharge pipe I.

After the technical scheme is adopted, large particles which do not meet the process requirements can be recycled or discarded, so that the quality of the produced blade material product is improved.

Preferably, the first overflow classifier has two feed inlets, one feed inlet is connected with the purification tank through a feed pipe VI, and the other feed inlet is connected with the discharge port of the milling device through a material circulating pipe II.

After the technical scheme is adopted, the slurry fed originally and the slurry milled circularly are fed through different feed inlets respectively, so that the process flow is more standard, and the slurry fed into the feed pipe VI is prevented from being poured into the milling device or the material circulating pipe II to be poured into the purification tank.

Preferably, a discharge pipe VI is connected to a discharge port at the lower part of the second overflow classifier, a feed pipe VIII and a waste discharge pipe II are respectively connected to the discharge pipe VI, and the feed pipe VIII is communicated with a feed inlet of the milling device.

After the preferable scheme is adopted, large particles which do not meet the process requirements can be recycled or discarded, so that the quality of the produced blade material product is improved.

A production method for producing single-specification cutting materials comprises the following steps: crushing, airflow classification, pulping, purification, overflow classification and dehydration drying.

In the air flow grading step, small-particle-size powder separated from the upper part of the air flow grading machine is conveyed to a pulping tank for pulping, and large-particle-size powder separated from the lower part of the air flow grading machine is conveyed to a crushing device for crushing again;

in the overflow grading step, first overflow grading is carried out in a first overflow grading machine, slurry of powder with over-small particle size separated by the first overflow grading is abandoned, slurry of powder with large particle size separated by the first overflow grading enters a second overflow grading machine to carry out second overflow grading, slurry of powder with small particle size separated by the second overflow grading is output to be dried and dehydrated, slurry of powder with large particle size separated by the second overflow grading is conveyed to a grinding device to be ground by a wet method, and then the slurry of powder ground by the wet method is conveyed to the first overflow grading machine to carry out overflow grading again.

After the technical scheme is adopted, in the air flow classification and overflow classification processes, the small-particle-size powder particles meeting the process requirements are conveyed to the next step, and the large-particle-size powder particles not meeting the process requirements are circularly crushed or milled until the particle size of the powder particles meets the process requirements. Finally, the blade material product with a single specification is produced.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the method realizes the production of the cutting edge material with a single specification in the process flow, avoids the production of the cutting edge material with an unnecessary specification, and ensures that the utilization rate of the raw material is higher.

2. The working mode of the overflow grading device is changed from a mode of separating powder with various specifications by changing the water inlet speed in the traditional process into a mode of separating powder with one specification by keeping the water inlet speed constant, so that the production process is higher in efficiency and stronger in continuity.

3. The air classifier is divided into two stages, so that the powder can be classified more fully. The air flow velocity in the first air flow classifier is higher than that of the second air flow classifier, powder is separated step by step through two different air flow velocities, and the problem that particles which are not in line with the process requirements are output from wrong discharge ports due to the fact that the large particles and the small particles are mixed and bonded with each other and are not dispersed for enough time is avoided.

4. In the air flow classification and overflow classification processes, large particles which do not meet the process requirements can be selected to be recycled or discarded, so that the quality of the produced blade material product is improved.

5. The raw feeding slurry and the circularly milled slurry are fed through different feeding ports respectively, so that the process flow is more standard, and the slurry fed into the feeding pipe VI is prevented from being poured into the milling device or the material circulating pipe II into the purification tank.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of the mechanism of the production line of the present invention.

1-a comminution apparatus, 2-a feed pipe I, 3-a feed pipe II, 4-a first air classifier, 5-a discharge pipe I, 6-a vacuum pump I, 7-a material circulation pipe I, 8-a first overflow classifier, 9-a waste discharge pipe I, 10-a feed pipe III, 11-a second air classifier, 12-a discharge pipe II, 13-a feed pipe IV, 14-a pulping tank, 15-a feed pipe V, 16-a purification tank, 17-a feed pipe VI, 18-a first overflow classifier, 19-a discharge pipe III, 20-a feed pipe I, 21-a discharge pipe IV, 22-a feed pump I, 23-a feed pipe VII, 24-a second overflow classifier, 25-a discharge pipe V, 26-a feed pipe II, 27-a discharge pipe VI, 28-feeding pipe VIII, 29-feeding pump II, 30-waste discharge pipe II, 31-feeding pump III, 32-grinding device, 33-material circulation pipe II, 34-stirring device.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

The present invention will be described in detail with reference to fig. 1.

Example 1

A production line for producing single-specification cutting materials comprises a crushing device 1, an air classifier, a pulping tank 14, a purifying tank 16 and an overflow classifier which are connected in sequence, and further comprises a grinding device 32.

Still be provided with material circulating pipe I7 between the discharge gate of reducing mechanism 1 and air classifier lower part, there are two feed inlets on reducing mechanism 1, and two feed inlets are connected with inlet pipe I2 and material circulating pipe I7 respectively. The air classifier comprises a first air classifier 4 and a second air classifier 11, wherein a feed inlet of the first air classifier 4 is communicated with a discharge outlet of the crushing device 1 through a feed pipe II 3, a discharge outlet on the upper part of the first air classifier 4 is communicated with a feed inlet of the second air classifier 11 through a feed pipe III 10, a discharge outlet on the lower part of the first air classifier 4 is communicated with a material circulation pipe I7 through a discharge pipe I5, a discharge outlet on the lower part of the second air classifier 11 is communicated with a discharge pipe I5 through a discharge pipe II 12, and a discharge outlet on the upper part of the second air classifier 11 is communicated with a pulping tank 14 through a feed pipe IV 13.

The overflow classifier comprises a first overflow classifier 18 and a second overflow classifier 24, a feed inlet of the first overflow classifier 18 is communicated with the purification tank 16 through a feed pipe VI 17, a discharge outlet at the lower part of the first overflow classifier 18 is communicated with a feed inlet of the second overflow classifier 24 through a discharge pipe IV 21, a feed pump I22 is arranged on the discharge pipe IV 21, a discharge pipe VI 27 is arranged on a discharge outlet at the lower part of the second overflow classifier 24, a feed pipe VIII 28 is arranged on a feed inlet of the grinding device 32, the discharge pipe VI 27 is communicated with the feed pipe VIII 28, a feed pump II 29 is arranged on the feed pipe VIII 28, and a discharge outlet of the grinding device 32 is communicated with a feed inlet of the first overflow classifier 18 through a material circulating pipe II 33.

Example 2

On the basis of embodiment 1, still be connected with waste material discharge pipe I9 on discharging pipe I5, be provided with vacuum pump I6 between discharging pipe I5 and material circulating pipe I7, be provided with vacuum pump II 8 between discharging pipe I5 and the waste material discharge pipe I9.

Example 3

On the basis of example 1, the first overflow classifier 18 has two inlets, one inlet is connected to the purification tank 16 via a feed line VI 17, and the other inlet is connected to the outlet of the mill 32 via a material circulation line II 33.

A discharge pipe VI 27 is connected to a discharge port at the lower part of the second overflow classifier 24, a feed pipe VIII 28 and a waste discharge pipe II 30 are respectively connected to the discharge pipe VI 27, and the feed pipe VIII 28 is communicated with a feed port of a milling device 32.

The above examples 1 to 3 are mainly used for producing single-specification cutting materials, and the production method is as follows:

a production method for producing single-specification cutting materials comprises the following steps:

[1] crushing: the crushing device adopts a jaw crusher, a double-roll crusher, a ball mill or an autogenous mill, etc., to crush the blocky green silicon carbide material.

[2] Air flow classification: and the small-particle-size powder separated from the upper part of the air classifier is conveyed to a pulping tank for pulping, and the large-particle-size powder separated from the lower part of the air classifier is conveyed to a crushing device for crushing again.

[3] Pulping: mixing the powder and water in a pulping pool according to a proportion to form a slurry, wherein the preferable proportion is 1: 1.

[4] and (3) purification: the purification comprises the technical processes of acid washing, alkali washing, deacidification and the like of the slurry. The acid washing aims at washing away metal impurities in the slurry, the alkali washing aims at removing impurities of materials such as silicon dioxide, and finally the pH of the slurry is adjusted to be neutral through deacidification.

[5] And (3) overflow classification: the method comprises the steps of firstly carrying out primary overflow classification in a first overflow classifier, discarding slurry of powder with an excessively small particle size separated by the primary overflow classification, enabling slurry of powder with a large particle size separated by the primary overflow classification to enter a second overflow classifier for secondary overflow classification, outputting slurry of powder with a small particle size separated by the second overflow classification for drying and dehydration, conveying slurry of powder with a large particle size separated by the second overflow classification to a grinding device for wet grinding, and conveying the slurry of powder subjected to wet grinding to the first overflow classifier for overflow classification again.

[6] And (5) dehydrating and drying.

The technical scheme is characterized in that particles with large particle size and particles with small particle size in the powder prepared by crushing are separated by air flow classification, the powder particles with small particle size meeting the process requirements are sent into a pulping tank for pulping, and the powder particles with large particle size not meeting the process requirements are sent into a crushing device for crushing again. Therefore, after the crushing process is finished, the output powder particles are all powder particles with small particle size meeting the process requirements. After the processes of pulping and purification are sequentially carried out, the obtained pulp is subjected to overflow classification treatment. In the conventional process, overflow classification is used for separating powder in slurry into a plurality of batches with different specifications according to different particle sizes. However, in the present technical solution, the overflow classification only outputs the powder within a certain particle size range as a product, the powder with a particle size higher than the process requirement is sent to the milling device for milling, the milled powder is subjected to overflow classification again, and the above process is repeated until all the powder in the slurry is broken into powder with the same specification and meeting the process requirement. Through the process, the single-specification cutting edge material production is realized in the process flow, the cutting edge material with the unnecessary specification is prevented from being produced, and the utilization rate of the raw material is higher. In addition, the working mode of the overflow grading device is changed from a mode of separating powder with various specifications by changing the water inlet speed in the traditional process into a mode of separating powder with one specification by keeping the water inlet speed constant, so that the production flow has higher efficiency and stronger continuity.

The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.

Claims

1. A production line for single-specification blade material production comprises a crushing device (1), an air classifier, a pulping tank (14), a purification tank (16) and an overflow classifier which are connected in sequence, and is characterized in that: the device also comprises a grinding device (32), and a material circulating pipe I (7) is arranged between the crushing device (1) and a discharge hole at the lower part of the air flow classifier; the overflow classifier comprises a first overflow classifier (18) and a second overflow classifier (24), a feed inlet of the first overflow classifier (18) is communicated with the purification tank (16), a discharge outlet at the lower part of the first overflow classifier (18) is communicated with a feed inlet of the second overflow classifier (24), a discharge outlet at the lower part of the second overflow classifier (24) is communicated with the grinding device (32), and a discharge outlet of the grinding device (32) is communicated with the feed inlet of the first overflow classifier (18) through a material circulating pipe II (33).

2. A production line for single gauge blade stock production according to claim 1, wherein: the air classifier comprises a first air classifier (4) and a second air classifier (11), wherein a feed inlet of the first air classifier (4) is communicated with a discharge outlet of the crushing device (1), a discharge outlet on the upper part of the first air classifier (4) is communicated with a feed inlet of the second air classifier (11), a discharge outlet on the lower part of the first air classifier (4) is communicated with a material circulation pipe I (7) through a discharge pipe I (5), a discharge outlet on the lower part of the second air classifier (11) is communicated with a discharge pipe I (5) through a discharge pipe II (12), and a discharge outlet on the upper part of the second air classifier (11) is communicated with a pulping pool (14).

3. A production line for single gauge blade stock production according to claim 2, wherein: still be connected with waste material discharge pipe I (9) on discharging pipe I (5), be provided with vacuum pump I (6) between discharging pipe I (5) and material circulating pipe I (7), be provided with vacuum pump II (8) between discharging pipe I (5) and waste material discharge pipe I (9).

4. A production line for single gauge blade stock production according to claim 1, wherein: the first overflow classifier (18) is provided with two feed inlets, one feed inlet is connected with the purification tank (16) through a feed pipe VI (17), and the other feed inlet is connected with a discharge hole of the grinding device (32) through a material circulating pipe II (33).

5. A production line for single gauge blade stock production according to claim 1, wherein: a discharge pipe VI (27) is connected to a discharge port at the lower part of the second overflow classifier (24), a feed pipe VIII (28) and a waste discharge pipe II (30) are respectively connected to the discharge pipe VI (27), and the feed pipe VIII (28) is communicated with a feed inlet of a grinding device (32).

6. A production method for producing single-specification cutting materials comprises the following steps: crushing, airflow grading, pulping, purifying, overflow grading and dehydrating and drying;

the method is characterized in that: in the air flow grading step, small-particle-size powder separated from the upper part of the air flow grading machine is conveyed to a pulping tank for pulping, and large-particle-size powder separated from the lower part of the air flow grading machine is conveyed to a crushing device for crushing again;