Method for refining high-purity ferrosilicon

Abstract

The invention discloses a method for refining high-purity ferrosilicon. The method adopts the following technological steps: a silicon controlled medium-frequency induction furnace is adopted as a refining device for heating and mixing ferrosilicon, and a crucible is positioned in the refining device, wherein the crucible is made from quartz sand, boric acid and sodium silicate; a furnace floor, a furnace wall, a furnace collar and furnace nozzles are sectionally dried, and synthetic slag washing and refining technologies are adopted; and heating is carried out after electrification, and the ferrosilicon is completely molten, is then added with the synthetic slag which accounts for 3%-5% of the total mass of the ferrosilicon, is heated for 30-40munites until the slag to be synthesized is completely molten, is inductively mixed for 15-30minutes and is stood for 4-10minutes so as to deslag and discharge for casting the ferrosilicon. The method has the advantages that the method for refining is simple in technology and equipment, is safe and efficient, is technically feasible, is reasonable in economy and can obtain a good refining effect; and in addition, the added synthetic slag does not contain chloride, so that the environment cannot be polluted, no harm is caused to the human body, and the method is safe and environment-friendly.

Description

technical field [0001] The invention belongs to alloy technology, and in particular relates to a refining method of low-aluminum, low-calcium, low-carbon and high-purity ferrosilicon. Background technique [0002] The main role of ferrosilicon in steelmaking is as a deoxidizer and alloy additive. With the development of high-purity steel and special steel types, the requirements for ferrosilicon impurities are becoming more and more stringent, and the demand for high-purity ferrosilicon has increased. The traditional production method is to add silica, steel shavings and carbonaceous reducing agent to smelt in submerged arc furnace. With the reduction of silicon, the main element in the furnace charge, other elements such as aluminum and calcium are also reduced into the alloy at the same time, so there are many impurity elements in ferrosilicon, which affect the quality of the product. At present, the production methods to control the impurity content of ferrosilicon are m...

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Problems solved by technology

This patent uses a chloride catalyst added to the mixed furnace charge. Although it can reduce environmental pollution, it still causes certain environmental pollution and personal hazards during the treatment process. The oxygen blowing treatment takes a long time and the production process is complicated.

[0006] In short, the current refining methods of ferrosilicon, among them, the concentrate method has a general effect of reducing the impurity content of ferrosilicon due to different actual raw material conditions, operation levels and management levels, and the aluminum reduction rate generally ranges from 20% to 55%. Outside the furnace Refining method has long processing cycle and complex process, which causes certain pollution to the environment and is easy to cause personal harm. Therefore, it is urgent to develop a simple process, short processing cycle, safe and reliable, non-polluting and pollution-free environment, and reduce ferrosilicon impurities. Ferrosilicon refining method with good content effect

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