Silicon material prepared by photovoltaic cutting waste and preparation method thereof
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A technology for cutting waste and photovoltaics, which is applied in the field of silicon material preparation, can solve the problems of poor wettability between cutting waste and aluminum liquid, low recovery rate of aluminum and silicon, and rising furnace bottom. , The effect of reducing process loss
Inactive Publication Date: 2019-07-09
NORTHEASTERN UNIV
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It is precisely because silicon carbide is easy to form and difficult to decompose during the reduction process, which brings great difficulties to the smelting process and easily causes the bottom of the furnace to rise. In the actual production process, silicon carbide has a greater impact on smelting than aluminum carbide
[0021] (2) Smelting at a high temperature of 2000°C, improper operation may easily cause gaseous volatilization losses of Al, Si and their low-valent oxides, resulting in low recovery rates of aluminum and silicon
[0022] (3) It is necessary to use low-iron bauxite, otherwise the iron content in the product is high, and the obtained aluminum-silicon alloy cannot be directly used to produce cast alloys, but can only be used as a deoxidizer for steelmaking, etc.
When smelting aluminum-silicon alloys, there are problems such as poor wettability between the cutting waste and the aluminum liquid, which makes it difficult to enter into the aluminum liquid to form an alloy, and the agglomeration of the cutting waste causes uneven distribution of silicon in the alloy and severe segregation.
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Embodiment 1
[0049] S1.1, mix photovoltaic cutting waste: water: cellulose evenly according to the mass ratio of 100:10:2 to obtain a mixture;
[0050] S1.2, use a pressure of 10MPa to press the mixture into a block, the size of the block is 3mm, and the shape is granular;
[0051] S1.3, put the block at 120°C to dehydrate and remove organic matter, after the block no longer volatilizes smoke, obtain a block of dehydration and deorganic matter, which is silicon material.
Embodiment 2
[0053] The silicon material produced by the method of Example 1 has a silicon content of more than 98%. It can be used in the smelting of various silicon alloys. Such as ferrosilicon alloy, silicon magnesium alloy, silicon manganese alloy.
Embodiment 3
[0055] S1, preparation of silicon material:
[0056] S1.1, mix the photovoltaic cutting waste: water: bentonite according to the mass ratio of 100:20:5 to obtain the mixture;
[0057] S1.2, use a pressure of 20MPa to press the mixture into a block, the size of which is 10mm, and the shape is a cube; it can also be pressed into strips, sheets or cones according to the shape of the die;
[0058] S1.31, dehydrating the block by vacuum dehydration to obtain a dehydrated block;
[0059] S1.32, place the dehydrated block at 350°C until the dehydrated block no longer volatilizes smoke, and obtain a dehydrated block of organic matter;
[0060] S2, smelting pretreatment:
[0061] Take the block of dehydration and organic matter required for one-time smelting, and wrap it with aluminum foil as a whole to make an aluminum-clad block;
[0062] Melt the aluminum raw material to be smelted into molten aluminum, and raise the temperature of the molten aluminum to 1500°C;
[0063] Preheat...
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Abstract
The invention relates to a method for preparing an aluminum-silicon alloy by using photovoltaic cutting waste. The method comprises the steps that S1.1, photovoltaic cutting waste, water and adhesiveare mixed evenly by a mass ratio of 100 to (10-30) to (2-8), and a mixture is obtained; S1.2, the mixture is pressed into a material block; and S1.3, the material block is subjected to dehydration andorganic matter removal, a material block which is subjected to dehydration and organic matter removal is obtained, and the material block which is subjected to dehydration and organic matter removalis a silicon material. The method for preparing the silicon material by using the photovoltaic cutting waste realizes recycling of waste in the photovoltaic industry and turns waste into treasure. Inthe process of processing the waste, the pressing can reduce the total volume, transportation and subsequent operation are facilitated, and process loss is reduced; the adhesive is used for shaping toprevent spalling. Low-temperature dehydration and high-temperature organic matter removal are performed to conveniently collect water and organic matter separately, and water and organic matter are separately discharged and used. The material block is processed to be used for smelting.
Description
technical field [0001] The invention relates to the technical field of secondary resource utilization, in particular to a silicon material prepared from photovoltaic cutting waste, and also provides a method for preparing the silicon material. Background technique [0002] Aluminum alloy has many advantages, such as light weight and high specific strength, and is the most widely used non-ferrous metal alloy. Among them, aluminum-silicon alloy is an indispensable intermediate alloy in the aluminum processing industry, and the market demand is strong. From January to July 2014, the output value of my country's aluminum-silicon alloy industry reached 25.616 billion yuan, a year-on-year increase of 29.2%. [0003] Al-Si alloys can be divided into two categories: deformed Al-Si alloys and cast Al-Si alloys. Among them, the Si content of deformed Al-Si alloys is generally 4.5% to 13.5%, which is mainly formed by forging or die-casting; the Si content of cast Al-Si alloys is most...
Claims
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