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Method for preparing silicon-calcium alloy

A technology of calcium-silicon alloy and metal, applied in the field of preparation of calcium-silicon alloy

Inactive Publication Date: 2011-02-23
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the current production method has low resource utilization rate, high energy consumption in the production process, consumes a large amount of carbon resources, emits a large amount of greenhouse gases and produces a large amount of industrial waste.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Press the silica powder into a disc with a diameter of 15mm and a thickness of 2mm and heat it at 800-1000 o C high temperature sintering for 2 hours, put 10 discs into a stainless steel basket as the cathode, and graphite as the anode, at 800-900 o C of CaCl containing 20mol% CaO 2 The molten salt is electrolyzed with a constant current of 10A direct current for 6 hours, and the cathode basket is taken out, and the electrolysis product is vacuum smelted to realize separation from the molten salt to obtain a calcium-silicon alloy with a calcium content of 5-20wt%.

Embodiment 2

[0025] Press 29g of silica powder and 5.6g of quicklime into 20 discs of varying thickness and grind them at 900 o C sintered for 2 hours, put the disk into a stainless steel basket as the cathode, and graphite as the anode, in 1000g of 950% CaO containing 10mol% o C CaCl 2 The molten salt is electrolyzed with a constant current of 20A direct current for 5 hours, and the cathode basket is taken out. The electrolysis product is vacuum smelted to realize separation from the molten salt, and a calcium-silicon alloy with a calcium content of 30-50wt% is obtained.

Embodiment 3

[0027] 23g of calcium silicate powder is made into 20 cylinders of different sizes and in 1000 o C sintered for 2 hours, put it into a stainless steel basket as the cathode, and graphite as the anode, at 850 o C CaCl 2 The molten salt is electrolyzed with a constant current of 15A direct current for 2-3 hours, and the cathode basket is taken out, and the electrolysis product is vacuum smelted to realize separation from the molten salt to obtain a calcium-silicon alloy with a calcium content of 5-20wt%.

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PUM

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Abstract

The invention discloses a method for preparing silicon-calcium alloy. The method comprises the following steps of: mixing 30 to 100 weight percent of silica powder or / and CaSiO3 powder and 0 to 70 weight percent of limestone powder or / and quicklime to prepare a porous raw blank; sintering and molding the porous raw blank at the high temperature of between 700 and 1,200 DEG C, and placing the product in a metal basket as a cathode; putting in calcium chloride fused salt at the temperature of between 800 and 950 DEG C and performing electrolysis by taking graphite or inert material as an anode; and performing vacuum melting on the electrolysis product to separate the electrolysis product from the fused salt so as to obtain the silicon-calcium alloy. In the method, the silicon-calcium alloy is prepared by combining solid reduction and electro-deposition; and the method has the characteristics of low operation temperature, cheap and readily available raw materials, high product purity and adjustable calcium content and product composition. Moreover, electrolysis can be performed by constant current or voltage, continuous production is easy to realize, high current efficiency can be achieved and the energy consumption and cost of silicon production can be obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and relates to a preparation method of a silicon-calcium alloy. Background technique [0002] Calcium silicon alloy, because calcium and silicon have a strong affinity with oxygen, especially calcium, not only has a strong affinity with oxygen, but also has a strong affinity with sulfur and nitrogen, and is widely used as a deoxidizer in iron and steel metallurgy , Desulfurizer, denitrification agent and alloying agent. [0003] According to the difference of calcium content, it is divided into: SiCa31 (Ca≥31.0%, Ca+Si≥90%); SiCa28 (Ca≥28.0%, Ca+Si≥85%); SiCa24 (Ca≥24.0%, Ca+Si≥80%) %); SiCa15 (Ca15% ~ 20%), etc. In addition, adding other elements on the basis of silicon-calcium alloys can form multi-element alloys, such as Si-Ca-Al, Si-Ca-Mn, Si-Ca-Fe, etc. [0004] At present, the industrial production of calcium-silicon alloy is a mixture of silicon oxide and calcium oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36
Inventor 汪的华朱华甘复兴林安
Owner WUHAN UNIV
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