Process for producing high purity magnesium oxide monocrystal using waste magnesite ore

A magnesite ore and production method technology, which is applied in the field of producing high-purity magnesium oxide single crystal from waste sub-magnesite ore, can solve the problems of polluting the environment, not meeting the sustainable development strategy, not meeting the clean production process, etc.

Inactive Publication Date: 2003-04-09
吕佳成
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the use of direct calcination, most of the high-grade magnesite is selected, and those secondary and tertiary medium and low-grade ores with low magnesium content are discarded, resulting in a great waste of resources.
At the same time, it occupies land and pollutes the ...

Method used

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  • Process for producing high purity magnesium oxide monocrystal using waste magnesite ore

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Experimental program
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Embodiment

[0034] Crush the magnesite ore to a particle size of about 200 mm, put it into a reverberatory furnace (lime kiln) and burn it at 800°C for 2 hours to obtain lightly burned magnesium. After cooling, take it out of the furnace, add water to the melting pool, stir it and pass it through ball milling. 120-mesh sieve, add water and digest for 3 hours, then pump into the carbonization pressure tank according to the solid-liquid ratio of 1:25, add water, keep the temperature of the reaction tank at 20°C, and feed CO with a concentration of 30-40% into the tank. 2 Gas, while constantly stirring, check the pH of the reaction tank after 40 minutes, and stop ventilation and stirring when it is slightly acidic. After the slurry in the tank is filtered by a scraper filter, it is poured into the storage tank and purified with a purifying agent, and then finely filtered, the aqueous solution flows into the pyrolysis tank, and is heated to 80-100°C by passing in superheated steam. At this tim...

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Abstract

The production process of high purity magnesia monocrystal with magenesite ore of 35-44 % purity includes baking in reverberatory furnace to obtain light burnt magnesia, cooling and ball milling, digesting via adding water andp umping to carbonating pressure tank, adding water and CO2 gas while maintaining the temperature, stirring to slight acid, filtering before and after adding purifying agent in a storage tank, decomposing with hot vapor and separating deposit; filtering, depositing and stoving to obtain light magnesia; pressing to form balls and incineration to obtain heavy magnesia monocrystal material; crushing and sintering at high temperature and high pressure to obtain magnesia monocrystal.

Description

technical field [0001] The invention relates to a method for obtaining magnesium oxide by calcination of magnesite ore, in particular to a method for producing high-purity magnesium oxide single crystal from waste submagnesite ore. Background technique [0002] The main component of magnesite ore is MgCO 3 , also contains varying amounts of Fe 2 o 3 ·Al 2 o 3 with SiO 2 and other impurities. Pure magnesite concentrate contains 47.8% MgO, but the concentrate is not ubiquitous, most magnesite contains MgCO 3 About 90% (MgO ~ 42%). MgCO 3 More than 95% of the ore is very small, so the magnesia directly calcined with magnesite contains a lot of impurities, which is very unfavorable. In order to obtain high-purity magnesia and magnesia, artificial synthesis technology is being adopted both at home and abroad, that is, high-purity magnesium carbonate is synthesized first, then lightly fired into magnesia, and the third step is calcined into magnesia at high temperature, ...

Claims

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Application Information

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IPC IPC(8): C30B1/02C30B29/16
Inventor 吕佳成
Owner 吕佳成
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