CN102218364A - Preparation process of silicon metal powder with high chemical activity and low fine powder rate and special equipment - Google Patents
Preparation process of silicon metal powder with high chemical activity and low fine powder rate and special equipment Download PDFInfo
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Abstract
The invention particularly relates to a preparation process of silicon metal powder with high chemical activity and low fine powder rate specific to the photovoltaic industry, and belongs to the field of processing of silicon materials. In the preparation process, a jaw crusher is firstly used for crushing raw materials for the first time till the diameter of the crushed raw materials reaches 2 to 5 centimeters; after the materials is deironization, the materials are conveyed to a cyclone mill and crushed for the second time to prepare semi-finished silicon powder with the particle size of 700 to 50 Mum; after re-deironization, according to the requirement on particle size of a finished product, the semi-finished silicon powder is screened by a vibrating screen of a screening machine into a larger-particle-size powder section, a finished product section and a smaller-particle-size powder section in terms of particle size sections; the powder of the larger-particle-size powder section is re-crushed; and the semi-finished powder of the finished product section and the smaller-particle-size powder section are proportioned to prepare the finished product finally. In the preparation process of the silicon metal powder disclosed by the invention, a revolving type silicon metal crushing technology is adopted, a wind power-mechanical power combined method is utilized to drive the silicon metal to move at a high speed automatically and be crushed mutually into powder, thus the specific surface area of metal silicon powder reaches 0.69 square meters per gram, and the fine powder rate is reduced within 8 percent simultaneously.
Description
Technical field
The present invention relates to a kind of preparation technology of metallic silicon power, particularly, belong to the silicon materials manufacture field at the preparation technology and the special equipment of a kind of high chemism low fine rate metallic silicon power of photovoltaic industry.
Background technology
At the photovoltaic industry, the specific area of metallic silicon power is an important indicator of reaction silica flour activity, and the specific area of powder is that the surface area that unit mass is occupied is a unit with ㎡/g.The silica flour specific area is big more, and it is fast more to participate in reaction speed, reacts more perfect, and the utilization rate of silicon is high more, and conversion zone fluidisation attitude is better, and silicon consumption rate is low more, thereby shows that its activity is high more.It is a lot of in the prior art with the silico briquette to be that raw material is produced the method for silica flour.Effect better in this, to use more be Lei Mengfa, double roll process, mill method and dash the method for revolving.Device therefor is corresponding to be Raymond mill, twin rollers, disc mill (also claiming Vertical Mill) and to dash the equipment that revolves.See that with regard to the powder process principle first three kind is that extruding is pulverized, the back is a kind of to be impact comminution, sees with regard to its structure, different very big, has their own characteristics each, and pluses and minuses are respectively arranged.The process equipment of first three kind prepares metallic silicon power, has the direct friction compressional movement of metal and silicon, thereby the easy powder of crossing seriously causes the fine powder rate too high, generally can surpass 15%, even reach 25%, and the too high production cost that can cause again of fine powder rate is too high.Therefore if can develop a kind of preparation equipment and preparation technology who takes into account the metallic silicon power of specific area and fine powder rate, will seem very necessary.
Summary of the invention
It is a kind of towards rotating metallic silicon crushing process that one of purpose of the present invention is to provide, the mode that adopts wind-force and mechanical power to combine, drive metallic silicon self high-speed motion, from being broken into powder mutually, make the metallic silicon power specific area reach 0.69 ㎡/g, simultaneously the fine powder ratio is reduced to 8% preparation technology with interior high chemism low fine rate metallic silicon power.
Two of purpose of the present invention is to provide the special equipment of described technology.
One of purpose of the present invention is achieved in that its preparation technology is as follows:
(1), the raw material of 10-20cm is stored in the former feed bin, in jaw crusher, it is broken that jaw crusher carries out the first time with raw material, is crushed to 2-5cm by the batcher transferring raw material;
(2), rise to the bistrique storehouse, material buffer before entering the whirlwind grinding machine is removed the iron compound in the material by tramp iron separator earlier by the material of elevator after with fragmentation;
(3), again by oscillating feeder with mass transport to the whirlwind grinding machine, adjust the rotating speed of whirlwind grinding machine, change the linear velocity of internal blade, be crushed to the granularity section semi-finished product silica flour of 700-50um for the second time;
(4), the semi-finished product silica flour that by another elevator grinding machine come out again promotes and enters another tramp iron separator, after the iron compound in the semi-finished product silica flour is removed, enters into surge bunker again;
(5), carry the semi-finished product silica flour to screen(ing) machine, according to the finished product granularity requirements, the vibratory sieve of screen(ing) machine sieves the semi-finished product silica flour become greater than finished product section, finished product section with less than the finished product section by the granularity section by oscillating feeder; Semi-finished product silica flour greater than the finished product section enters belt feed back machine, and it is broken to carry back the bistrique storehouse to prepare again it by belt feed back machine; Finished product section and detect earlier, packing respectively again less than the semi-finished product silica flour of finished product section;
(6), according to the specification requirement of product, by the proportioning of carrying out between finished product section and both the semi-finished product silica flours less than the finished product section finally is prepared into product.
Utilize the finished product section and be less than the compound method process that both semi-finished product silica flours of finished product section are mixed with product:
(1), according to the percentage that product granularity requires, press the finished product section and less than the testing result of two kinds of semi-finished product silica flours of finished product section, design the finished product section and less than two kinds of percentages that the semi-finished product silica flour is prepared of finished product section;
(2), according to the finished product section with less than two kinds of percentages that the semi-finished product silica flour is prepared of finished product section, regulate the motor revolution of converter parameter control batching motor, by batching motor feed at the uniform velocity, make the finished product section and less than the requirement of the percentage quantity that reaches batching of two kinds of semi-finished product silica flours of finished product section;
(3), that each semi-finished product section is mixed strand is even, general detection reaches product requirement, is packaged into finished product.
Two of purpose of the present invention is to realize like this, special equipment comprises former feed bin, batcher, jaw crusher, elevator, tramp iron separator, the bistrique storehouse, oscillating feeder, the whirlwind grinding machine, surge bunker, vibratory sieve and belt feed back machine, the raw material position in storehouse is in the top of batcher, the import position of batcher is positioned at the below at the outlet position of former feed bin, the outlet position of batcher is corresponding with the position of the charging aperture of jaw crusher, the discharging opening of jaw crusher is communicated with the charging aperture of elevator by pipeline, the discharging opening of elevator is communicated with the bistrique storehouse by pipeline, be provided with tramp iron separator in this pipeline, the bistrique storehouse is the surge bunker of whirlwind grinding machine top, the bistrique storehouse is provided with level-sensing device, the discharging opening below in bistrique storehouse is provided with oscillating feeder, the discharging opening of oscillating feeder is communicated with by pipeline with the charging aperture of whirlwind grinding machine, the discharging opening of whirlwind grinding machine is communicated with the charging aperture of another elevator by pipeline, the discharging opening of another elevator is communicated with surge bunker by pipeline, be provided with another tramp iron separator in this pipeline, the discharging opening below of surge bunker is provided with another oscillating feeder, and the discharging opening below of another oscillating feeder is provided with vibratory sieve, vibratory sieve is provided with three layers of screen cloth, promptly greater than finished product section layer screen cloth, finished product section layer screen cloth and less than finished product section layer screen cloth, wherein the outlet greater than finished product section layer screen cloth is communicated with the charging aperture of belt feed back machine, and the discharging opening of belt feed back machine is communicated with the charging aperture in bistrique storehouse.
Vibratory sieve is a linear vibrating screen, or and ultrasonic vibration sieve.
Batcher major function transferring raw material is to jaw crusher; The jaw crusher major function is carried out the fragmentation first time with raw material; The elevator major function with fragmentation after material be transported to the bistrique storehouse; Whirlwind grinding machine major function be adjust linear speed that mill speed changes internal blade produce institute must a product granularity section product requirement 50-700um; The linear vibrating screen major function is sieved into finished product with semi-finished product by the granularity section; The main recleaner screen semi-finished product of ultrasonic vibration sieve major function.
Elevator comprises the lifting tower body, reductor, motor, the electricity wheel cover, hopper, chain and contact roller, promote on the tower body, under be respectively equipped with discharging opening and charging aperture, the top that promotes tower body is provided with reductor, motor and electric wheel cover are provided with hopper in the tower body of lifting tower body, chain and contact roller, motor is provided with electric wheel cover outward, and motor via reducer is connected with the sprocket wheel that is positioned at the center, top that promotes tower body, and sprocket wheel is connected with the contact roller that is positioned at the bottom dead center position that promotes tower body by chain, chain is provided with some hoppers, and the hopper mouth of hopper is corresponding with the position of discharging opening and charging aperture respectively.
The present invention has the following advantages:
1, the metallic silicon power specific area reaches 0.69 ㎡/g, and at the actual conditions of mill formula of metallic silicon roller in the market and mill formula technology, the present invention improves its specific area under the prerequisite that does not increase production cost, improve the chemism of metallic silicon power greatly;
2, reduce the fine powder rate, reduce production costs 50%.The mode that the present invention adopts wind-force and mechanical power to combine drives metallic silicon self high-speed motion, from being broken into powder mutually, significantly reduced the direct friction compressional movement of metal and silicon, thereby, the fine powder ratio is reduced in 8% from 15%, reduce production costs 50%.
Description of drawings
Fig. 1, embodiment of the invention process chart.
The main TV structure schematic diagram of Fig. 2, embodiment of the invention special equipment.
The plan structure schematic diagram of Fig. 3, embodiment of the invention special equipment.
The elevator structural representation of Fig. 4, embodiment of the invention special equipment.
The elevator sectional structure schematic diagram of Fig. 5, embodiment of the invention special equipment.
Among the figure: former feed bin 1, batcher 2, jaw crusher 3, elevator 4,10, tramp iron separator 5, level-sensing device 6, bistrique storehouse 7, oscillating feeder 8,12, whirlwind grinding machine 9, surge bunker 11, vibratory sieve 13, belt feed back machine 14, reductor 15, motor 16, electric wheel cover 17 promotes tower body 18, hopper 19, chain 20, contact roller 21.
The specific embodiment
The present invention can specifically implement by the technology that illustrates in the summary of the invention, and by the following examples can the invention will be further described, yet scope of the present invention is not limited to following embodiment.
Embodiment 1: per hour to produce the 1000Kg metallic silicon power is example:
Process equipment comprises former feed bin 1, batcher 2, jaw crusher 3, elevator 4,10, tramp iron separator 5, bistrique storehouse 7, oscillating feeder 8,12, whirlwind grinding machine 9, surge bunker 11, vibratory sieve 13 and belt feed back machine 14, it is characterized in that, former feed bin 1 is positioned at the top of batcher 2, the import position of batcher 2 is positioned at the below at the outlet position of former feed bin 1, the outlet position of batcher 2 is corresponding with the position of the charging aperture of jaw crusher 3, the discharging opening of jaw crusher 3 is communicated with by the charging aperture of pipeline with elevator 4, the discharging opening of elevator 4 is communicated with bistrique storehouse 7 by pipeline, be provided with tramp iron separator 5 in this pipeline, bistrique storehouse 7 is provided with level-sensing device 6, level-sensing device 6 utilizes the automatic controlling alarm of high low level of material, the feed bin height is designed to 1000mm, metallic silicon is higher than 800mm and is lower than in feed bin and sends alarm in the 200mm scope automatically in feed bin, the quantity delivered of material reaches the requirement of regulating the position in storehouse stock before and after the control, the discharging opening below in bistrique storehouse 7 is provided with oscillating feeder 8, the discharging opening of oscillating feeder 8 is communicated with by pipeline with the charging aperture of whirlwind grinding machine 9, the discharging opening of whirlwind grinding machine 9 is communicated with by the charging aperture of pipeline with another elevator 10, the discharging opening of another elevator 10 is communicated with surge bunker 11 by pipeline, be provided with another tramp iron separator 5 in this pipeline, the discharging opening below of surge bunker 11 is provided with another oscillating feeder 12, the discharging opening below of another oscillating feeder 12 is provided with vibratory sieve 13, vibratory sieve 13 is provided with three layers of screen cloth, promptly greater than finished product section layer screen cloth, finished product section layer screen cloth and less than finished product section layer screen cloth, wherein the outlet greater than finished product section layer screen cloth is communicated with the charging aperture of belt feed back machine 14, and the discharging opening of belt feed back machine 14 is communicated with the charging aperture in bistrique storehouse 7.
Whole technology can be set at three feed bins and be connected process equipment with pipeline: it is that 2cm is roughing by the broken range of work metallic silicon of Hubei Province formula tentatively that the former feed bin of first is set, and pipeline connects; Establish the material level storehouse before the second portion abrasive material, set metallic silicon power and be controlled at the 200-800mm height, set the granularity 700 ~ 50um of Cyclone mill machined metallic silicon power, pipeline connects; The third part surge bunker is carried linear vibrating screen with whirlwind grinding machine 700-50um metallic silicon power by batcher, carries out 3 layers of sub-sieve, and pipeline connects.Equipment electrical equipment is by the control of ACP electrical equipment platform, and the ACP console is provided with the switch of each production process equipment, must stir electric switch 1 by the technological process order during production) elevator; 2) jaw crusher; 3) electromagnetic feeder; 4) another elevator; 5) whirlwind grinding machine; 6) belt feed back machine; 7) linear vibrating screen 8) electronic batcher; 9) oscillating feeder.
Batcher major function transferring raw material is to jaw crusher; The jaw crusher major function is carried out the fragmentation first time with raw material; Whirlwind grinding machine major function is to adjust the linear speed that mill speed changes internal blade to carry out fragmentation second time, the palpus product granularity section product requirement 700-50um to reach; The linear vibrating screen major function is sieved into finished product with semi-finished product by the granularity section; The main recleaner screen semi-finished product of ultrasonic vibration sieve major function.
The product quality of present embodiment requires: the 553# trade mark, specification: 630um ~ 90um; Specification requirement+630um≤5% ,-90um≤10%.
Preparation technology: raw material 553# trade mark silico briquette 10-20cm puts into former feed bin, and electromagnetic feeder is set electric current 3A, frequency 32Hz; The material silico briquette is undertaken after fragmentation is machined to 2cm first by setting jaw crusher; Be 5.5kw by the building machine electrical power again, 15T/h plate chain type elevator per hour, the silico briquette after the fragmentation should pass through tramp iron separator before rising to the bistrique storehouse, and silico briquette is material buffer before the bistrique storehouse enters the whirlwind grinding machine.Oscillating feeder setpoint frequency 32Hz convey materials is to the whirlwind grinding machine, mill speed should be regulated the speed of rotating speed 850 commentaries on classics/min and come production granularity section 630 ~ 90um silica flour, the grinding machine silica flour that comes out should pass through tramp iron separator by elevator before surge bunker, the silica flour of surge bunker by oscillating feeder setpoint frequency 32Hz after semi-finished product directly carry setting power 2 * 1.5, vibration 960r/min, amplitude 3-4.5mm linear vibrating screen, the straight line screen cloth is by having three layers: 1)+630um is that the 1st layer of straight line screen cloth exceeds the part metals silica flour and be transported to the feed back storehouse by belt and utilize control appliance running to produce processing again again more than the screen cloth; 2) 630um-90um is the 2nd layer of screen cloth of straight line screen cloth; 3)-the following metallic silicon power of 90um is the 3rd layer of screen cloth of straight line screen cloth.Wherein the 2nd, 3 layer of specification metallic silicon power packed with strap respectively after detecting.Exceeded-scope of 90um≤10% as the fine powder that requires in the silica flour in the 630um-90um, also needed partly become the product to pack through meticulous the sifting out of ultrasonic vibration sieve setpoint frequency 45Hz+90um.Equipment is according to different client's quality requirements, and each process equipment parameter need be advanced adjustment and reset.
Semi-finished product after the packing carry out proportioning, the customer requirement trade mark: 553# as requested; Specification: 630um ~ 90um; Specification requirement+630um≤5% ,-90um≤10%.
Matching method: 630um=7%(exceeds claimed range 2% as the actual measurement semi-finished product), general-630um≤2% carries out proportioning.The 630um actual measurement of comprehensive back is 4.5%, is requiring-630um≤5% meet the requirements.
Batching motor major function is carried out proportioning on request according to the segmentation finished product.
The specific area of metallic silicon power reaches more than or equal to 0.69 ㎡/g, and the fine powder ratio is reduced to below 8%.
Each parameter is:
1, silico briquette raw material specification 10-20cm;
2, batcher adopts the electromagnetic feeder feed, when being used for batching, dosing, guarantees that feed is uniform and stable, prevents that the material gravity flow level of answering from installing.Batcher current settings 0-3A, frequency 0-50Hz;
3, jaw crusher adopts the PEF jaw crusher, and 2-5cm, auxiliary motor power 15kw, speed of mainshaft 250-300 commentaries on classics/min are set in the gap;
4, elevator adopts plate chain type elevator, supporting electric power 5.5kw, conveying capacity 15T/H;
5, the whirlwind grinding machine adopts XF1000 type whirlwind grinding machine, and rotary speed is 850-1000 rev/min;
6, vibratory sieve adopts the XZSF linear vibrating screen, power 2 * 1.5 power, vibration 960r/min, amplitude 3-4.5mm;
7, vibratory sieve adopts 800 ultrasonic vibrations sieve, necessary electromotor power 0.75kw, frequency 0-50HZ;
8, batching motor batching, necessary electromotor power 5.5kw regulates change device parameter frequency 0-50HZ;
9, motor power 380AC.
Claims (5)
1. the preparation technology of one kind high chemism low fine rate metallic silicon power, it is characterized in that: its preparation technology is as follows:
(1), the raw material of 10-20cm is stored in the former feed bin, in jaw crusher, it is broken that jaw crusher carries out the first time with raw material, is crushed to 2-5cm by the batcher transferring raw material;
(2), rise to the bistrique storehouse, material buffer before entering the whirlwind grinding machine is removed the iron compound in the material by tramp iron separator earlier by the material of elevator after with fragmentation;
(3), again by oscillating feeder with mass transport to the whirlwind grinding machine, adjust the rotating speed of whirlwind grinding machine, change the linear velocity of internal blade, be crushed to the semi-finished product silica flour of the granularity section of 700-50um for the second time;
(4), the semi-finished product silica flour that by another elevator grinding machine come out again promotes and enters another tramp iron separator, after the iron compound in the semi-finished product silica flour is removed, enters into surge bunker again;
(5), carry the semi-finished product silica flour to screen(ing) machine, according to the finished product granularity requirements, the vibratory sieve of screen(ing) machine sieves the semi-finished product silica flour become greater than finished product section, finished product section with less than the finished product section by the granularity section by oscillating feeder; Semi-finished product silica flour greater than the finished product section enters belt feed back machine, and it is broken to carry back the bistrique storehouse to prepare again it by belt feed back machine; Finished product section and detect earlier, packing respectively again less than the semi-finished product silica flour of finished product section;
(6), according to the specification requirement of product, by the proportioning of carrying out between finished product section and both the semi-finished product silica flours less than the finished product section finally is prepared into product.
2. the preparation technology of a kind of high chemism low fine rate metallic silicon power according to claim 1 is characterized in that: utilize the finished product section and less than the compound method process that both semi-finished product silica flours of finished product section are mixed with product be:
(1), according to the percentage that product granularity requires, press the finished product section and less than the testing result of two kinds of semi-finished product silica flours of finished product section, design the finished product section and less than two kinds of percentages that the semi-finished product silica flour is prepared of finished product section;
(2), according to the finished product section with less than two kinds of percentages that the semi-finished product silica flour is prepared of finished product section, regulate the motor revolution of converter parameter control batching motor, by batching motor feed at the uniform velocity, make the finished product section and less than the requirement of the percentage quantity that reaches batching of two kinds of semi-finished product silica flours of finished product section;
(3), that each semi-finished product section is mixed strand is even, general detection reaches product requirement, is packaged into finished product.
3. the preparation technology's of the described a kind of high chemism low fine rate metallic silicon power of claim 1 special equipment, it comprises former feed bin (1), batcher (2), jaw crusher (3), elevator (4,10), tramp iron separator (5), bistrique storehouse (7), oscillating feeder (8,12), whirlwind grinding machine (9), surge bunker (11), vibratory sieve (13) and belt feed back machine (14), it is characterized in that: former feed bin (1) is positioned at the top of batcher (2), the import position of batcher (2) is positioned at the below at the outlet position of former feed bin (1), the outlet position of batcher (2) is corresponding with the position of the charging aperture of jaw crusher (3), the discharging opening of jaw crusher (3) is communicated with by the charging aperture of pipeline with elevator (4), the discharging opening of elevator (4) is communicated with bistrique storehouse (7) by pipeline, be provided with tramp iron separator (5) in this pipeline, bistrique storehouse (7) is provided with level-sensing device (6), the running of equipment before and after the control, the discharging opening below in bistrique storehouse (7) is provided with oscillating feeder (8), the discharging opening of oscillating feeder (8) is communicated with by pipeline with the charging aperture of whirlwind grinding machine (9), the discharging opening of whirlwind grinding machine (9) is communicated with by the charging aperture of pipeline with another elevator (10), the discharging opening of another elevator (10) is communicated with surge bunker (11) by pipeline, be provided with another tramp iron separator (5) in this pipeline, the discharging opening below of surge bunker (11) is provided with another oscillating feeder (12), the discharging opening below of another oscillating feeder (12) is provided with vibratory sieve (13), vibratory sieve (13) is provided with three layers of screen cloth, promptly greater than finished product section layer screen cloth, finished product section layer screen cloth and less than finished product section layer screen cloth, wherein the outlet greater than finished product section layer screen cloth is communicated with the charging aperture of belt feed back machine (14), and the discharging opening of belt feed back machine (14) is communicated with the charging aperture of bistrique storehouse (7).
4. the preparation technology's of a kind of high chemism low fine rate metallic silicon power according to claim 3 special equipment, it is characterized in that: elevator (4,10) comprise lifting tower body (18), reductor (15), motor (16), electricity wheel cover (17), hopper (19), chain (20) and contact roller (21), promote on the tower body (18), under be respectively equipped with discharging opening and charging aperture, the top that promotes tower body (18) is provided with reductor (15), motor (16) and electric wheel cover (17), be provided with hopper (19) in the tower body of lifting tower body (18), chain (20) and contact roller (21), the outer electric wheel cover (17) that is provided with of motor (16), motor (16) is connected with the sprocket wheel that is positioned at the center, top that promotes tower body (18) by reductor (15), sprocket wheel is connected with the contact roller (21) that is positioned at the bottom dead center position that promotes tower body (18) by chain (20), chain (20) is provided with some hoppers (19), and the hopper mouth of hopper (19) is corresponding with the position of discharging opening and charging aperture respectively.
5. according to the preparation technology's of claim 3 or 4 described a kind of high chemism low fine rate metallic silicon powers special equipment, it is characterized in that: vibratory sieve (13) is a linear vibrating screen, or and ultrasonic vibration sieve.
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