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Process for producing magnesium oxide from waste magnesite ore

A technology of magnesite ore and production method, which is applied in the field of producing high-purity magnesia from waste sub-magnesite ore, and can solve problems such as polluting the environment, occupying land, and not conforming to clean production processes

Inactive Publication Date: 2003-04-09
沈阳市龙龙炉料加工厂
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  • Summary
  • Abstract
  • 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 environment, which is neither in line with the sustainable development strategy nor in line with the requirements of clean production technology

Method used

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  • Process for producing magnesium oxide from waste magnesite ore

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Embodiment

[0030] Crush the magnesite ore to a particle size of about 200mm, put it into a reverberatory furnace (lime kiln) and burn it at 800°C for 2 hours to obtain lightly burned magnesium. 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 time, the solution decomposes , precipitated out. Use a plate and frame filter press to filter out the aqueous solution (r...

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Abstract

The present invention relates to production process of magnesia from waste magnesite ore. The magnesite ore of 35-44 % purity is crushed to 100-300 mm size and baked in a reverberator at 700-850 deg.c to obtain light burned magnesia, and the light burned magnesia is produced into light magnesia through ball milling, 120-mesh sieving, adding water to digest, mixing with introduced Co2 in the carbonating pressure tank to light acid while stirring, filtering, purifying, heating with same to 80-100 deg.c to decompose and deposit for separation, filtering to eliminate water, stoving and sintering at 800-900 deg.c and other steps. The said process can produce various magnesia products with waste magnesite ore.

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 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, and its purity ...

Claims

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Application Information

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IPC IPC(8): C04B2/10
Inventor 吕佳成
Owner 沈阳市龙龙炉料加工厂