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Smelting method of low silicon high calcium single crystal electric melting magnesite clinker

A technology of fused magnesia and single crystal, which is applied in the field of fused magnesia, can solve the problems of high impurity content and inability to apply high-tech scientific research fields, and achieve the effects of high product quality, short smelting cycle and energy saving

Inactive Publication Date: 2007-07-18
崔凤海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its high impurity content, it cannot be applied to high-precision scientific research fields, electronics industry and optical instrument industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The implementation equipment is an electric arc furnace with a shell diameter of 1200mm, a supporting electric furnace transformer of 1600KVA, an electrode diameter of 250mm, and a current of 9000-11000A.

[0033] Take a total of 9800Kg of selected light-burned magnesium oxide powder with a content of caustic soda + MgO ≥ 98% and a particle size of 0-7mm, and put them in an electric arc furnace in batches for melting. After starting the furnace for 1 hour, use raw materials to press the open flame in the furnace, put 8.5Kg of impurity remover evenly in the inner triangle area, and then press 50-100mm thick raw materials for smelting, and then use the same method to add in the same area every 30 minutes The same weight of impurity remover until shutdown. The melting time is 9 hours. The crystals of the product are as long as 5-150mm, of which: 135Kg with a magnesium oxide content of 99.5% (crystal), 1285kg with 98.5%, 2674Kg with 98%, 1439Kg with 97.5%, and 345kg with 9...

Embodiment 2

[0035] The implementation equipment is an electric arc furnace with a shell diameter of 1300mm, a supporting electric furnace transformer of 1800KVA, an electrode diameter of 300mm, and a current of 11000-13000A.

[0036] Take a total of 9000 kg of selected light-burned magnesium oxide powder with a content of caustic soda + MgO ≥ 98% and a particle size of 0-7 mm, and put them into the electric arc furnace in batches. 1 hour after starting the furnace, press the open flame in the furnace with raw materials, put 9Kg of impurity remover evenly in the inner triangle area, and then press the raw material with a thickness of 50-100mm for smelting, and then add it in the same area every 30 minutes with the same method The same weight of impurity remover until shutdown. The single crystal of the product is 5-180mm long, of which: 115kg with a magnesium oxide content of 99.5% (crystal), 185kg with a 98.5% content, 2874kg with a 98% content, 1039kg with a 97.5% content, and 145kg with...

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Abstract

This invention relates to a Low-silicon, high-calcium solitary crystal fused Magnesia melting methods. It takes light burned magnesia that content not less tan 98% as raw materials. Prepare the Impurity except agent, and its raw materials formulation, specifications, according to weight respectively : magnesite stone powder, the content is over 46%, 180 heads and 60; the industrial grade petroleum coke 10-20; magnesium hydroxide industrial grade 10-20; magnesium fluoride is not less than 70%, 5-10; Soda sodium carbonate is not less than 99%, 15-25. Method: accurately weigh raw materials by prescription, mixed with magnesium chloride solution to increases bonding, use the ball machine to shape ball, and then drying to water content be less than 3%. Add the impurity except agent when melting, use raw materials to press open fire after the electric furnace starting one hour, add impurity except agent into electrode triangle, and then press on the 50-100mm raw materials. Every 30 minutes to repeat this operation until shutdown. Weight ratio of raw materials and impurity removal agent is 1000:13-15, uniform adding by grade.

Description

technical field [0001] The invention relates to the technical field of melting fused magnesia using light-burned magnesia powder as a raw material, especially low-silicon and high-calcium single crystal fused magnesia. Background technique [0002] The technology of smelting fused magnesia with lightly burned magnesia powder began in Yingkou area of ​​my country in 1991. Compared with smelting electric fused magnesia with magnesite ore as raw material, it has the advantages of low energy consumption, and the content of magnesium oxide MgO in the product is more than 98%, accounting for 25-30%. Later, individual units added additives aimed at reducing impurities and increasing the content of magnesia in the smelting process of fused magnesia. The ingredients and parts by weight of the additive are: 70% magnesium oxide fine powder, 20-30% graphite, 1.5-1.7% waste electrode powder, 8-10% halogen sheet, 2.5-2.7% magnesium fluoride reagent, and 0.15-0.17% rare earth oxide. Mix ...

Claims

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Application Information

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IPC IPC(8): C04B2/00
Inventor 崔凤海
Owner 崔凤海
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