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A method for calcining dolomite and separating calcium and magnesium in water to produce magnesium hydroxide and calcium carbonate

A magnesium hydroxide and dolomite technology, applied in the direction of magnesium hydroxide, calcium carbonate/strontium/barium, etc., can solve the problems of high energy consumption, lengthy process of calcium hydroxide and calcium carbonate, etc.

Active Publication Date: 2016-03-09
贵州胜威化工新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention solves the problems of lengthy process and high energy consumption for preparing calcium hydroxide and calcium carbonate from dolomite, and provides a method for producing magnesium hydroxide and calcium carbonate by calcining dolomite and separating calcium and magnesium in water. The method has the advantages of simple process, Features of low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 10 grams of dolomite, crush it to a particle size of about 50 mm, place it in a muffle furnace for calcination at a temperature of 1000 ° C for 1 hour, after cooling, dissolve it with 600 ml of water for 20 minutes while stirring at room temperature, and filter the solution with a filter cloth. The filtrate is fed with carbon dioxide to precipitate and precipitate, and then filtered, and the filter residue is dried to obtain calcium carbonate. The filtrate is returned to dissolve and leach the calcined tailings dolomite again, and the above operation is repeated 5 to 8 times until the calcium in the calcined tailings dolomite is completely leached. The remaining liquid with high solid content after water immersion is added with purifying agent to remove iron and aluminum, filtered and dried to obtain solid magnesium hydroxide.

Embodiment 2

[0016] Take 10 grams of dolomite, crush it to a particle size of about 50mm, place it in a muffle furnace and calcinate at 950°C for 70 minutes, after cooling, dissolve it repeatedly with water for 40 minutes while stirring at room temperature, filter the solution with a filter cloth, and the filtrate Introduce carbon dioxide, precipitate out, and then filter, the filter residue is calcium carbonate. The remaining liquid with high solid content after water immersion is added with purifying agent to remove iron and aluminum, filtered and dried to obtain solid magnesium hydroxide.

Embodiment 3

[0018] Take 20 grams of dolomite, crush it to a particle size of 50-70mm, place it in a muffle furnace and calcinate at 1000°C for 1 hour, after cooling, dissolve it with 1000ml of water for 30 minutes under stirring at room temperature, and filter the solution through a filter cloth , the filtrate is passed through carbon dioxide, precipitates out, and then filtered, the filter residue is calcium carbonate, the filtrate is returned to dissolve and leach calcined dolomite again, repeat the above operation 5 to 8 times, until the calcium in the dolomite is completely leached. The remaining liquid with high solid content after water immersion is added with purifying agent to remove iron and aluminum, filtered and dried to obtain solid magnesium hydroxide.

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PUM

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Abstract

The invention provides a method for separating calcium and magnesium and preparing magnesium hydroxide by water dissolving and leaching of burnt dolomite. The method comprises the following operation steps: crushing the dolomite and burning into dolomite ashes; slaking the dolomite ashes by water to generate calcium hydroxide and magnesium hydroxide; filtering and separating an insoluble substance magnesium hydroxide; introducing carbon dioxide to leaching liquid to separate out calcium carbonate precipitate; separating again to obtain a calcium carbonate product, adding a purifying agent to filter residue to remove impurities such as iron, aluminum and the like, centrifuging and separating, and baking, so as to obtain the magnesium hydroxide product. The method has the characteristics of being low in cost, simple in process, and good in product quality, and a new production way is provided for preparation of magnesium hydroxide from dolomite.

Description

Technical field [0001] The invention belongs to the field of chemical industry and relates to a method for producing magnesium hydroxide and calcium carbonate by using dolomite. Background technique [0002] Dolomite is a compound non-metallic mineral mainly composed of calcium carbonate and magnesium carbonate, and it is the raw material for preparing calcium and magnesium products. [0003] At present, for the utilization of dolomite, there are purely physical processing methods, such as mechanical crushing into powder, and chemical processing methods such as carbonization, acid dissolution, and transformation. [0004] Magnesium hydroxide is a chemical product with a wide range of uses. It is used as a neutralizer for industrial acid-containing wastewater in the field of environmental protection, industrial and mining enterprises and mines due to its advantages such as large buffering capacity, high activity, strong adsorption capacity, and non-toxic and harmless. Heavy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/22C01F11/18
Inventor 周骏宏李小龙龙万情程厚能田县莉朱博含
Owner 贵州胜威化工新材料研究院有限公司
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