Method for simultaneously recycling silicon in silicon waste materials and titanium in titanium-containing slag through metallic aluminum

Abstract

The invention relates to a method for simultaneously recycling silicon in silicon waste materials and titanium in titanium-containing slag through metallic aluminum, and belongs to field of non-ferrous metal secondary resource comprehensive technologies. The method comprises the steps that CaO powder and SiO2 powder are uniformly mixed, then Na3AlF6 is added to be uniformly mixed, and mixed powderis obtained; the mixed powder is pre-molten for 0.5-1 h under the condition that the temperature is between 1,400 DEG C and 1,600 DEG C to obtain a pre-molten block, and the pre-molten block is cooled and then ground into powder to serve as a fluxing agent; metallic aluminum particles, the metallic silicon waste materials, the titanium-containing slag and the fluxing agent are uniformly mixed toobtain a mixed material, and the mixed material is smelted for 2-4 h at high temperature under the condition that the temperature is between 1,500 DEG C and 1,800 DEG C; and the high-temperature smelted material is cooled to room temperature at the constant speed, linear cutting treatment is conducted, and an alloy block containing aluminum, silicon and titanium is obtained. According to the method, the purpose of recycling silicon and titanium from the silicon waste materials and the titanium-containing slag simultaneously is achieved, and the current comprehensive recycling problem of the silicon waste materials and the titanium-containing slag is solved.

Description

technical field [0001] The invention relates to a method for simultaneously recovering silicon in silicon waste and titanium in titanium-containing slag by using metal aluminum, and belongs to the comprehensive technical field of nonferrous metal secondary resources. Background technique [0002] With the increasingly serious problems of energy shortage and environmental pollution, photovoltaic solar cells have been vigorously developed, and the substrates used to manufacture crystalline silicon solar cells are mainly crystalline silicon materials. After the crystalline silicon ingot is broken and surface treated, the silicon brick (rod) is multi-wire cut and post-treated to obtain the crystalline silicon wafer. During the slicing process of crystalline silicon, whether diamond wire cutting or mortar cutting is used, since the diameter of the cutting wire is not much different from the thickness of the required silicon wafer, more than 40% of the high-purity crystalline sili...

AI Technical Summary

Problems solved by technology

[0006] Generally speaking, the mechanical properties of products made by making cement and building materials are good, but a large amount of titanium resources are wasted, and the economic added value is low, so it is not worth popularizing and applying

The amount of titanium-containing blast furnace slag consumed to make functional materials is small and cannot be industrialized on a large scale; the current methods for processing crystalline silicon cutting waste and titanium-containing blast furnace slag have low production capacity, long recovery cycle and process, and high environmental load

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