Method for producing high-purity silicon/silicon alloy by slag-forming refining of high silicon waste
A silicon alloy and waste technology, applied in the field of materials, can solve the problems of environmental pollution, loss of crystalline silicon, etc., and achieve the effects of reducing pollution, efficient recycling, and short process
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Embodiment 1
[0029] The high-silicon waste used is the cutting waste generated when slicing solar crystalline silicon ingots; the cutting waste generated when slicing solar crystalline silicon ingots is waste generated by diamond cutting and silicon carbide cutting; the high-silicon waste is dried and removed Moisture, as a raw material;
[0030] Prepare the slagging agent; the mass ratio of the raw material and the slagging agent is 100:20; the slagging agent is a calcium compound containing CaCO in mass percentage 3 2%, CaCl 2 33%, CaF 2 15%, CaO 50%;
[0031] Turn on the smelting furnace, put the raw materials and slagging agent into the smelting furnace for slagging and refining, and form a melt after the raw materials and slagging agent are completely melted; control the temperature of the smelting furnace at 1480-1500 °C during the slagging and refining process; The method of adding raw materials and slagging agent is as follows: mix the raw materials and slagging agent evenly ...
Embodiment 2
[0036] Process such as figure 1 shown;
[0037] Method is with embodiment 1, and difference is:
[0038] (1) The high-silicon waste material used is the grinding waste produced when the crystalline silicon ingot is polished; the high-silicon waste material is first pickled to remove impurities, then washed with water until the filtrate is neutral, and finally dried as a raw material; the acid solution used for pickling is For hydrochloric acid with a mass concentration of 5%, the mass ratio of acid solution to high-silicon waste during pickling is 15:1;
[0039](2) Prepare a slagging agent; wherein the mass ratio of the raw material to the slagging agent is 100:3; the slagging agent is a mixed compound, which is formed by mixing a magnesium compound and a calcium compound; the calcium compound contains CaCO in mass percentage 3 89%, CaCl 2 5%, CaF 2 4%, CaO 2%; Magnesium compounds contain MgO 50%, MgCO 3 15%, MgF 2 20%, MgCl 2 15%; the calcium compound in the mixed...
Embodiment 3
[0045] (1) The high-silicon waste material used is the head and tail material cut off after crystalline silicon ingot casting; the high-silicon waste material is first pickled to remove impurities, then washed with water until the filtrate is neutral, and finally dried as raw material; the acid used for pickling The solution is sulfuric acid with a mass concentration of 30%, and the mass ratio of the acid solution to the high-silicon waste during pickling is 3:1;
[0046] (2) Prepare the slagging agent; the mass ratio of the raw material and the slagging agent is 100:60; the slagging agent is a mixed compound, which is composed of a sodium compound and a calcium compound; the calcium compound contains CaCO in mass percentage 3 59%, CaF 2 5%, CaO36%; sodium compounds contain Na by mass percentage 2 CO 3 50%, NaHCO 3 15%, NaCl 20%, NaF 15%; the calcium compound in the mixed compound accounts for 40% of the total mass;
[0047] (3) During the slagging and refining process...
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