Carbon-containing silicon iron as well as preparation method and application thereof

A technology of ferrosilicon and crystalline silicon, which is applied in the field of carbon-containing ferrosilicon and its preparation, can solve the problems of high environmental load pressure, low processing efficiency, and long process flow, so as to reduce the environmental load, reduce the power consumption of smelting, and increase the temperature Obvious effect

Pending Publication Date: 2021-04-06
PANZHIHUA GANGCHENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the shortcomings of the current utilization method of crystalline silicon cutting slag due to long process flow, high environmental load pressure, and low processing efficiency, the present invention provides a carbon-containing ferrosilicon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The crystalline silicon cutting slag waste obtained from diamond wire-cut monocrystalline silicon rods is washed with water to remove impurities, and then filtered through a press frame. The filtered silicon-containing cutting slag waste is passed through fluidized bed drying equipment, and the drying temperature is controlled at 220°C. After 2 hours, crystalline silicon cutting slag with a moisture content of 2.8% was obtained, and 75 tons of crystalline silicon cutting slag was cold-pressed to obtain a 70mm crystalline silicon cutting slag cold-pressed block for later use, and 21 tons of scrap steel resources were added into a submerged arc furnace, and slowly raised High temperature, until the steel scrap is in a molten state, add 4 tons of coke and the cold briquette of crystalline silicon cutting slag prepared above through the trough, continue to heat up and smelt, and the smelting temperature is controlled between 1300 ° C and 1500 ° C throughout the process, addin...

Embodiment 2

[0027] The crystalline silicon cutting slag waste obtained from diamond wire-cut monocrystalline silicon rods is washed with water to remove impurities, and then filtered through a press frame. The filtered silicon-containing cutting slag waste is passed through fluidized bed drying equipment, and the drying temperature is controlled at 260°C. After 2 hours, silicon-containing cutting slag waste with a moisture content of 2.5% was obtained, and 73.5 tons of silicon-containing cutting slag waste was cold-pressed to obtain a crystalline silicon cutting slag cold-pressed block with a size of 60 mm for use. Add 31 tons of scrap steel with a submerged arc furnace, slowly raise the temperature until the scrap steel is in a molten state, add 7 tons of coke and crystalline silicon cutting slag cold briquettes through the trough, continue to heat up and smelt, and the smelting temperature is controlled at 1200-1400 °C throughout the process 2 tons of additives composed of silicon dioxid...

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PUM

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Abstract

The invention discloses carbon-containing silicon iron as well as a preparation method and application thereof. The carbon-containing silicon iron is prepared from the following components in percentage by mass: 58%-77% of crystalline silicon cutting slag, 20%-40% of scrap steel, 3%-12% of coke and the balance of auxiliaries, wherein the mass fraction of water in the crystalline silicon cutting slag is less than 3%. Firstly, secondary resources of crystalline silicon cutting slag and scrap steel are recycled, the resource utilization rate is high, the quality and performance of the obtained carbon-containing silicon iron are stable, maximum utilization of the resources is achieved, the environmental load is reduced, and waste is reduced; and the carbon-containing silicon iron is convenient to transport, obvious in heating effect in semisteel steelmaking and low in price, has the advantage of higher cost performance, and has wide popularization and application values.

Description

technical field [0001] The invention belongs to the field of circular utilization of crystalline silicon cutting slag and waste resources, and in particular relates to a carbon-containing ferrosilicon and its preparation method and application. Background technique [0002] Crystalline silicon is an important raw material for the photovoltaic industry. For a long time, its cutting technology has mainly been silicon carbide mortar cutting technology and diamond wire cutting technology. At present, slag is mainly used for the utilization of waste resources such as acid leaching method and physical solid-liquid separation method. Due to the long process flow, high environmental load pressure, and low processing efficiency. Contents of the invention [0003] Aiming at the shortcomings of the current utilization method of crystalline silicon cutting slag due to long process flow, high environmental load and pressure, and low processing efficiency, the invention provides a carbo...

Claims

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Application Information

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IPC IPC(8): C21B3/04C21C7/00C22C33/04C22C38/02
CPCC21B3/04C21C7/005C22C33/04C22C38/02Y02W30/50
Inventor 严翀陈涛毛朋郭仁孝卓胜杨陶
Owner PANZHIHUA GANGCHENG GROUP
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