Production method of nano metal silicon particles

Abstract

The invention discloses a production method of nano metal silicon particles. The method comprises the following steps: pre-dehydrating or airing raw material silicon sludge, crushing by a crusher, adding an adhesive, uniformly mixing, conveying the mixture into a granulator by an auxiliary conveying belt provided with a magnetic head at the terminal to remove iron and magnetic material impurities,granulating, conveying silicon particles into a dryer by a conveying belt, drying, and finally bagging to obtain the nano metal silicon particles. The obtained nano metal silicon particles are granular, the diameter of each nano metal silicon particle is 3-8mm, the length of each nano metal silicon particle is 5-25mm, and the water content of the nano metal silicon particles is 0.5-8%; the content of impurity SiO2 is equal to 1-12%; and the content of elemental silicon is 72-98%. According to the invention, the production process of the process is thoroughly changed; low energy consumption and low pollution are achieved through a pure physical process, the potential value of the industrial by-product silicon mud is practically and efficiently utilized, the silicon mud is deeply processedinto the nano metal silicon particles, energy conservation, emission reduction and cyclic utilization are achieved to the maximum extent, and the method has certain economic value and social benefit when being converted into industrial production.

Description

technical field [0001] The invention belongs to the technical field of silicon material preparation, and in particular relates to a method for producing nanometer metal silicon particles. Background technique [0002] The production of photovoltaic modules includes four key links: polysilicon production, ingot slicing, cell and module production. Among them, diamond wire slicing is widely used in monocrystalline silicon enterprises. In the process of cutting monocrystalline silicon and polycrystalline silicon with diamond wire, a large amount of cutting silicon powder will be produced, and the average size of the silicon powder is 5.5-10.5 μm; in addition, cutting silicon powder contains a large amount of cutting fluid. The powder is settled by flocculation and then collected by a filter press to finally obtain a "mud cake", here simply referred to as "silicon mud". Due to the small size of silicon powder in "silicon mud" and containing moisture and non-silicon impurities;...

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Problems solved by technology

[0003] At present, the application method of the by-product silicon mud in the photovoltaic industry in the market is: use an intermediate frequency furnace to melt and recrystallize into silicon ingots, and this process requires high standards for the raw materials of the silicon mud, that is, the elemental silicon content of the silicon mud after drying is 95%. -98%, which leads to limited selection of silicon mud, and the processing and production of silicon ingots will generate a large amount of dust whether it is in the drying process or in the melting process of entering the melting furnace, which will cause serious dust pollution to the environment. At the same time, the production of this process belongs to An industry with high energy consumption and high pollution, which conflicts with the industrial upgrading, energy conservation and environmental protection advocated by the current government

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