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A method for preparing silicon powder
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A technology of silicon powder and silicon block, which is applied in the field of preparing silicon powder, and can solve the problems of frequent maintenance and blade replacement of impact mills, heavy operation and maintenance workload, and low automation of impact crushing systems.
Active Publication Date: 2017-05-10
SHANDONG UNIV +1
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Problems solved by technology
Compared with extrusion crushing, this process has the advantages of low equipment price, small product particle size and low energy consumption, but the impact crushing system has a low degree of automation, heavy operation and maintenance workload, and frequent maintenance and blade replacement of the impact crushing machine
Dust-laden exhaust gas is produced, which pollutes the environment, and the system is not protected by argon gas when grinding silicon powder, so there is a risk of explosion
Method used
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Embodiment 1
[0015] (1) Raw materials are prepared according to the following mass percentages: 95.57% industrial silicon dioxide, 4.00% Si-P alloy, and 0.43% industrial pure aluminum (wherein the phosphorus content in the Si-P alloy is 13wt%).
[0016] (2) Melt industrial silicon blocks in a smelting furnace, add Si-P alloy and industrial pure aluminum, stir and melt them, and cast them into ingots after they are completely reacted.
[0017] (3) Put the ingot in water for 32 hours to make it fully hydrolyzed and pulverized.
[0018] (4) The powdered material after hydrolysis was taken out, and dried in a vacuum oven at 90°C for 3 hours.
[0019] The silicon powder prepared according to the above-mentioned proportion and process has a particle size of 150-400 μm.
Embodiment 2
[0021] (1) Raw materials are prepared according to the following mass percentages: 91.43% industrial silicon dioxide, 7.70% Si-P alloy, 0.87% industrial pure aluminum (wherein the phosphorus content in the Si-P alloy is 13wt%).
[0022] (2) Melt industrial silicon blocks in a smelting furnace, add Si-P alloy and industrial pure aluminum, stir and melt them, and cast them into ingots after they are completely reacted.
[0023] (3) Put the ingot in water for 12 hours to fully hydrolyze it.
[0024] (4) The hydrolyzed material was taken out and dried in a vacuum oven at 90° C. for 3 hours.
[0025] The silicon powder prepared according to the above-mentioned proportion and process has a particle size of 100-200 μm.
Embodiment 3
[0027] (1) Raw materials are prepared according to the following mass percentages: 83.80% industrial silicon dioxide, 14.40% Si-P alloy, and 1.80% industrial pure aluminum (wherein the phosphorus content in the Si-P alloy is 13wt%).
[0028] (2) Melt industrial silicon blocks in a smelting furnace, add Si-P alloy and industrial pure aluminum, stir and melt them, and cast them into ingots after they are completely reacted.
[0029] (3) Put the ingot in the air for 24 hours to naturally hydrolyze and pulverize.
[0030] (4) Dry the powdery material at 90° C. for 1 hour in a vacuum drying oven.
[0031] The silicon powder prepared according to the above-mentioned proportion and process has a particle size of 15-50 μm.
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Abstract
The invention belongs to the field of metal materials and discloses a method for preparing silicon powder by utilizing a melt process. The method comprises the following steps: by taking industrial silicon blocks, an Si-P alloy and industrial pure aluminum as raw materials, melting the industrial silicon blocks by adopting the melt process, then, adding the Si-Pi alloy and the industrial pure aluminum into the molten industrial silicon blocks to obtain a mixture, melting and stirring the mixture, and casting the mixture into a mould after completely reacting; putting the prepared cast ingot into water (or air) for sufficiently hydrolyzing and pulverizing the cast ingot; and drying a pulverized powder material to obtain 15-400 [mu]m silicon powder. The method adopts the melt process, and utilizes chemical reaction to complete a process from silicon blocks to silicon powder. Different from conventional physical crushing methods such as extrusion crushing, impact crushing and the like, the method disclosed by the invention is relatively safe, environmentally-friendly and energy-saving.
Description
technical field [0001] The invention belongs to the field of metal materials, and particularly relates to a method for preparing silicon powder by using a melt method with industrial silicon block, Si-P alloy and industrial pure aluminum as raw materials. Background technique [0002] Due to the great progress of "silicon" technology and the market demand for "silicon" products, the demand for primary products of silicon has increased significantly. In the prior art, there are many methods for preparing silicon powder with silicon blocks as raw materials, but they all use physical methods to break the silicon blocks. Among them, the Raymond method is better and the most widely used is the roller method, disc grinding method and punch spin method. The equipment used is Raymond method, roller mill, disc mill (also known as vertical mill) and punching method. As far as the principle of milling is concerned, the first three are extrusion crushing, and the latter is impact crus...
Claims
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Application Information
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