Process for removing calcium from magnesite

A magnesite and calcium process technology, applied in the direction of magnesium hydroxide, etc., can solve the problems of incomplete calcium removal, long process, and reduction to 1.5%, and achieve the effect of flexible product solutions, short process flow, and thorough calcium removal

Inactive Publication Date: 2011-07-20
LIAONING XINFAZHAN REFRACTORY MATERIAL GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The flotation method has simple process, short process and low cost, but for magnesite with high calcium content, calcium removal is not complete, and it is difficult to reduce the CaO content to less than 1.5%
The carbonization method has a high removal rate of calcium, but there are problems of complicated process, long process and high cost

Method used

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  • Process for removing calcium from magnesite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 500g of magnesite containing 8.71% CaO and place it in a muffle furnace, and calcinate at 940°C for 2h to obtain 240g of light-burned magnesium oxide powder. Put the calcined light-calcined magnesium oxide powder in a 1000mL reaction tank, add 500mL of 30°C water, and carry out the digestion reaction under stirring. After 20 minutes, 90 g of magnesium nitrate was added thereto, and the stirring was continued for 30 minutes to carry out the decalcification reaction, and the reaction temperature during the decalcification process was maintained at 50° C. After the reaction, the slurry was filtered, and the filter cake was washed with 1260 mL of water. The washed filter cake was dried in an oven at 110° C. for 4 hours to obtain 306 g of magnesium hydroxide product, and the CaO content in the magnesium hydroxide product was 0.42%.

Embodiment 2

[0032] Take 500g of magnesite containing 9.32% CaO and place it in a muffle furnace, and calcinate at 990°C for 2h. 240 g of lightly burned magnesium oxide powder was obtained. Put the calcined light-calcined magnesium oxide powder in a 2000mL reaction tank, add 1000mL of 50°C water, and carry out the digestion reaction under stirring. After 15 minutes, 141 g of magnesium chloride hexahydrate was added thereto, and the stirring was continued for 1.5 hours to carry out the decalcification reaction, and the reaction temperature during the decalcification process was maintained at 70°C. After the reaction, the slurry was filtered, and the filter cake was washed with 1820 mL of water. The washed filter cake was dried in an oven at 120° C. for 3 hours to obtain 306 g of magnesium hydroxide product, and the CaO content in the magnesium hydroxide product was 1.13%.

Embodiment 3

[0034] Take 500g of magnesite containing 7.13% CaO, place it in a muffle furnace, and calcinate it at 1030°C for 2h. 241 g of lightly burned magnesium oxide powder was obtained. Put the lightly calcined magnesium oxide powder obtained by calcining into a 2000mL reaction tank, add 1400mL of 20°C water, and carry out the digestion reaction under stirring. After 1.5 hours, 118 g of magnesium bromide was added thereto, and the stirring was continued for 2 hours to carry out the decalcification reaction, and the reaction temperature during the decalcification process was maintained at 30° C. After the reaction, the slurry was filtered, and the filter cake was washed with 3200 mL of water. The washed filter cake was dried in an oven at 130° C. for 2 hours to obtain 307 g of magnesium hydroxide product, and the CaO content in the magnesium hydroxide product was 0.29%.

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Abstract

The invention relates to a process for removing calcium from magnesite. The process is characterized by finally reducing the content of calcium oxide below 1.5% through magnesite calcination, slaking, calcium removal, filtration, washing, drying and other treatment procedures. The process has the following beneficial effects: the magnesium hydroxide product which is obtained after removing calcium and has content of calcium oxide being lower than 1.5% can be directly applied to the fields such as flame retardants, oil additives, water treatment neutralizers and the like; other high value-added magnesium-containing materials such as industrial magnesium oxide, electrician magnesium oxide, fused magnesium oxide, light magnesium carbonate and the like can be further processed and produced; and compared with the existing processes for removing calcium from magnesite, the process has the advantages of short flow, low cost, flexible product scheme, thorough calcium removal and the like.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and inorganic chemical industry, and specifically relates to a production process of using magnesite as a raw material, removing calcium therein through chemical processing, and preparing high-purity magnesite chemical materials. Background technique [0002] Magnesite is a non-metallic mineral mainly containing magnesium carbonate, and it is an important source of metallic magnesium and magnesian materials. Metal magnesium can be obtained by reducing magnesite with ferrosilicon in an electric furnace. Magnesite can also be subjected to other thermal or chemical processing to produce various magnesia materials. For example, magnesite is calcined at 800-1200°C to obtain magnesium oxide powder, commonly known as lightly burned powder. Lightly burned powder can be directly used in metallurgy, building materials, environmental protection and other fields. Lightly calcined powder can be f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14
Inventor 董波胡庆福刘宝树赵晓康卢赤杰雷辉征
Owner LIAONING XINFAZHAN REFRACTORY MATERIAL GRP
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