Alkaline type washing method for block-shaped silicon raw materials

A silicon raw material and block technology, which is applied in the cleaning field of block silicon raw materials, can solve the problems of long cleaning cycle and achieve the effect of reducing processing difficulty, reducing processing cost and shortening cleaning time

Inactive Publication Date: 2017-05-10
江苏迩高新能源科技有限公司
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AI-Extracted Technical Summary

Problems solved by technology

[0004] However, due to pickling, there are relatively many cleaning steps and the cleaning cycle is relatively long; in addition, the cost of the acid required for the pickling step plus the cost of acid solution treatment is much higher than the purchase of non-heavy metal or only ultra-high metals. The difference between the cost of recycled materials for a small amount of...
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Abstract

The invention discloses an alkaline type washing method for block-shaped silicon raw materials. The alkaline type washing method comprises the following steps that the portions containing impurities in the block-shaped silicon raw materials are polished; polished silicon raw materials are stored in a clear-water pool for flushing and then placed in an alkaline liquor pool for steeping, and the residual impurities and glue liquor residues on the surface of the silicon raw materials are steeped and washed; and the silicon raw materials are sequentially stored into the clear-water pool for flushing and then into ultrasonic washing equipment for washing. From the working process, it is known that acid is not required in the washing process of the silicon raw materials by adoption of the alkaline type washing method for the block-shaped silicon raw materials, so that producing cost is lowered, the washing efficiency of the silicon raw materials is improved, and the processing difficulty and the processing cost of waste water are lowered.

Application Domain

Drying gas arrangementsGrinding machines +1

Technology Topic

Water poolMaterials science +5

Image

  • Alkaline type washing method for block-shaped silicon raw materials

Examples

  • Experimental program(1)

Example Embodiment

[0037] Such as figure 1 As shown, the present invention includes the following steps: 1) Grind the part of the bulk silicon raw material that contains impurities; put the ground silicon raw material into a clean water tank for washing, and observe the surface of the silicon raw material after washing;
[0038] 2) According to observation: Put the silicon material containing a small amount of impurities or even no impurities into the lye bath for soaking, soak and wash the impurities and glue residue on the surface of the silicon material; repeat the steps for the silicon material with a large amount of impurities 1) Operation;
[0039] 3) Soak the silicon raw material put into the lye bath in step 2) for 15-25 minutes, and take out the silicon raw material immersed in the lye bath and observe (in this example, the silicon raw material immersion time is 20 minutes) ;
[0040] 4) According to observation: Put the silicon raw materials with bright surface, no residual dirt and no impurities in the clean water tank for washing and ultrasonic cleaning equipment; the silicon raw materials with trace impurities are polished again; the ones that still contain a small amount of impurities Repeat step 3) for silicon raw materials;
[0041] 5) Put the silicon raw material that has been polished away from impurities into a clean water tank for washing, and observe the surface of the silicon raw material after washing;
[0042] 6) According to observation: clean the silicon raw material with bright surface, no residual dirt and no impurities in the ultrasonic cleaning equipment; put the silicon raw material with residual dirt on the surface into the lye tank for alkaline washing, and the residual silicon raw material surface Soak the glue residue;
[0043] 7) Soak the silicon raw material put into the lye bath in step 6) for 2 to 5 minutes (in this case, the silicon raw material is immersed for 5 minutes), and take out the silicon raw material soaked in the lye bath and observe;
[0044] 8) According to observation: Put the silicon material with bright surface, no residual dirt and no impurities in the clean water tank for washing and ultrasonic cleaning equipment; repeat the operation of step 7) for the silicon material with residual dirt on the surface.
[0045] The lye in the lye pool is sodium hydroxide solution, and the mass percentage of sodium hydroxide in the sodium hydroxide solution is in the range of 1% to 3% (in this case, the mass percentage of sodium hydroxide is 1%).
[0046] The temperature of the lye in the lye pool is in the range of 55-100 degrees Celsius.
[0047] When the room temperature environment is greater than or equal to 25 degrees Celsius, the temperature of the lye in the lye pool is within the range of 55 to 65 degrees Celsius (in this case, the temperature of the lye in the lye pool is 60 degrees Celsius); when the room temperature is 20~ When the temperature is in the range of 25 degrees Celsius, the temperature of the lye in the lye pool is in the range of 65 to 80 degrees Celsius (in this case, the temperature of the lye in the lye pool is 70 degrees Celsius); when the room temperature environment is lower than 20 degrees Celsius , The temperature of the lye in the lye pool is within the range of 80 to 100 degrees Celsius (in this case, the temperature of the lye in the lye pool is 90 degrees Celsius).
[0048] The pH value of the lye is tested every 2 to 5 minutes during the soaking process (in this case, the silicon raw material is immersed in the lye pool for 15 to 25 minutes during the immersion process, and it is tested every 5 minutes. The pH value of a lye solution; the silicon material is soaked in the lye pool for 2 to 5 minutes, and the pH value of the lye solution is checked every 2 minutes).
[0049] When the silicon material is soaked in the lye, when the pH value of the lye is less than or equal to 12, the lye needs to be replaced.
[0050] The bulk silicon raw material is recycled material or pure material.
[0051] When the bulk silicon material is tested with a heavy-doped pen, the alarm sound of the heavy-doped pen cannot be heard at a distance greater than or equal to 0.1 meters.
[0052] After the silicon raw material is cleaned by the ultrasonic cleaning equipment, the silicon raw material is dried.
[0053] The drying temperature of the silicon raw material is in the range of 100 to 120 degrees Celsius (in this embodiment, the drying temperature of the silicon raw material is 110 degrees Celsius, and the drying time is 1 hour).

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