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Method of preparing monocrystal fused magnesia sand by magnesium chloride

A technology of magnesium chloride to make sheets and fused magnesia, which is applied in the direction of magnesium oxide, can solve the problems of high iron and silicon content, high product price, complicated process, etc., and achieve high-grade products, less equipment and easy raw materials. The effect

Inactive Publication Date: 2009-08-05
崔凤海
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  • Application Information

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Problems solved by technology

However, due to its high content of iron and silicon, it cannot be used in the electronics industry, optical instruments and related scientific and technological fields.
In foreign countries, seawater is used as raw material to prepare high-purity magnesia, but the process is complicated, the process is long, and the product price is high.

Method used

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  • Method of preparing monocrystal fused magnesia sand by magnesium chloride

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Effect test

Embodiment 1

[0027] The raw material is magnesium chloride (MgCl) in Chaerhan Lake, Golmud City, Qinghai Province. 2 ·6H 2 O) 60 tons, add 24 tons of 45~50 ℃ of steam hot water, after stirring, clarifying, filtering, remove impurities, the specific gravity of the clarified magnesium chloride solution is 1.34-1.36. Using an acid-resistant pump to pump 0.8Mpa through a porous nozzle with a pore size of 0.4mm, spray the misted magnesium chloride solution into the slurry feed boiling roasting furnace at 900-1000°C. After the reaction, it is separated twice by a cyclone separator and a glass fiber cloth bag. Lightly burned fine powder with 99% magnesia content, 7.5 tons.

[0028] Its physical and chemical indicators are as follows:

[0029] MgO 99.21%, CaO 0.38%, SiO 2 0.18%, Fe 2 O 3 0.04%, Al 2 O 3 0.09%. Add an appropriate amount of magnesium chloride clear liquid into a ball by a disc balling machine, and then send it to a 1600KVA electric arc furnace for melting and smelting. Af...

Embodiment 2

[0033] The raw material is magnesium chloride (MgCl) from Dalian Salt Chemical Plant. 2 ·6H 2 O) 60 tons plus 24 tons of 50 ℃ steam hot water, after stirring, clarification and filtration, remove impurities and sediments floating on the surface, the specific gravity of the clarified magnesium chloride solution is 1.34-1.36, and the acid-resistant pump is used to pump 0.8Mpa and the aperture is 0.4 The 900-1000°C slurry feed boiling calciner was sprayed with a 900-1000°C slurry feeder with a multi-hole nozzle of millimeters and sprayed into the misted magnesium chloride clear liquid, which was separated twice by a cyclone separator and a glass fiber cloth bag to obtain 7.2 tons of light-burned magnesium oxide fine powder. The physical and chemical indicators of light-burned magnesia powder are as follows:

[0034] MgO 99.1%, CaO 0.38%, SiO 2 0.12%, Fe 2 O 3 0.04%, Al 2 O 3 0.09%. Add an appropriate amount of magnesium chloride solution to form a ball by a disc balling...

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Abstract

The preparation method of single-crystal fused magnesia made of magnesium chloride is hot-melting, dissolving magnesium chloride hexahydrate with a content of 46% or more in water at 45-50°C to a solution with a specific gravity of 1.34-1.36, filtering and discarding the filter residue. Use an acid-resistant pump to spray the solution in the storage tank through a porous nozzle into a slurry feed boiling roaster at 900-1000°C for dehydration and pyrolysis to generate light-burned magnesium oxide powder and hydrogen chloride gas, which enter the cyclone separator with the exhaust gas through the internal pressure of the furnace It is separated twice from the glass fiber bag, the magnesium oxide enters the silo, and a small amount enters the glass fiber bag for recovery. Magnesium oxide is bonded and solidified with an appropriate amount of magnesium chloride solution, and then it is made into 0-10mm particles by a ball forming machine, and then it is dried and fused, naturally cooled, and sorted to become a finished product. The invention has the advantages of advanced technology, reliable process, easy operation, short smelting cycle, energy saving, high product yield and good quality. It can be used in optical instrument manufacturing and electronic industry, and has good economic benefits.

Description

technical field [0001] The invention relates to the technical field of smelting fused magnesia with light-burned magnesia powder, in particular to the technical field of smelting fused magnesia with magnesium chloride hexahydrate through dehydration and pyrolysis to prepare light-burned magnesia powder. technical background [0002] The fused magnesia on the market is mostly made of magnesite ore, which is made by crushing, electric melting, natural cooling, sorting and other processes. The more advanced one is the two-step method, that is, the magnesite ore is calcined to make light-burned magnesia powder, and then it is made by electric melting, natural cooling and sorting. The advantages of the latter are that the energy consumption is low, the ton power consumption of fused magnesia is only 2800-900 kWh, and the magnesium oxide content in the product is more than 98% can account for 25-30%, which can be used as medium and high-grade refractory materials. However, due to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/10
Inventor 崔凤海
Owner 崔凤海