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Process for producing high-purity basic magnesium carbonate from dolomite

A process method and dolomite technology, applied in directions such as magnesium carbonate, can solve problems such as difficult separation of calcium and magnesium, and achieve the effects of abundant raw materials, high yield and low production cost

Inactive Publication Date: 2013-07-03
内蒙古昶泰资源循环再生利用科技开发有限责任公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that it is difficult to completely separate calcium and magnesium in the existing carbonization production, the invention provides a process for producing high-purity basic magnesium carbonate from dolomite. By adding oxalic acid or soluble oxalate during carbonization, the Improve the yield of basic magnesium carbonate produced by the dolomite carbonization method, and solve the technical problem that calcium and magnesium are difficult to completely separate in the dolomite carbonization method

Method used

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  • Process for producing high-purity basic magnesium carbonate from dolomite
  • Process for producing high-purity basic magnesium carbonate from dolomite
  • Process for producing high-purity basic magnesium carbonate from dolomite

Examples

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Embodiment 1

[0029] Example 1: The chemical composition of dolomite is MgO content 20.96%, CaO content 30.06%, broken to 2~5cm. Calcined at 900°C for 3 hours to obtain calcined white. The calcined white is mixed according to the mass ratio of water: calcined white is 50:1, the digestion temperature is controlled at 60°C, and the heat preservation is digested for 1 hour to obtain the emulsion. The emulsion is passed through a 60-mesh sieve to obtain refined magnesium emulsion. After cooling to room temperature, CO 2 , CO 2 The flow rate is 0.5L / min, and the pH value of the carbonization system is tracked and tested. When the carbonization system is at pH=8.5, add ammonium oxalate to make the concentration of oxalate in the system 0.002mol / L, continue carbonization to pH=6.5, and stop carbonization. The carbonized system is separated from solid to liquid, the solid phase is light calcium carbonate, and the liquid phase is heavy magnesium water. The obtained heavy magnesium water was pyr...

Embodiment 2

[0030] Example 2: The chemical composition of dolomite is MgO content 20.96%, CaO content 30.06%, broken to 2~5cm. Calcined at 950°C for 2.5h to obtain calcined white. Mix calcined white according to the mass ratio of water: calcined white is 40:1, stir and heat to 70°C, heat-preserve and digest for 1.5h to obtain emulsion. The emulsion is passed through a 60-mesh sieve to obtain refined magnesium emulsion. After cooling to room temperature, CO2 , CO 2 The flow rate is 0.8L / min, and the pH value of the carbonization system is tracked and tested. When the carbonization system is at pH=9.0, add oxalic acid to make the concentration of oxalate in the system 0.005mol / L, continue carbonization to pH=6.8, and stop carbonization. The carbonized system is separated from solid to liquid, the solid phase is light calcium carbonate, and the liquid phase is heavy magnesium water. The obtained heavy magnesium water was pyrolyzed at 100°C for 2 hours, solid-liquid separation after cooli...

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Abstract

The invention discloses a process for producing high-purity basic magnesium carbonate from dolomite, which adopts a carbonization method and uses dolomite as a raw material. The method comprises the following steps: grinding, calcining, digesting the calcined dolomite, filtering, carbonizing magnesium emulsion, pyrolyzing a heavy magnesium solution, and drying to obtain basic magnesium carbonate.The carbonization process of the magnesium emulsion is as follows: after the magnesium emulsion is cooled, carbon dioxide is introduced; when the pH value reaches 7.5-9.5, oxalic acid or soluble oxalate is added to ensure that the concentration of oxalate groups in the system is 0.001-0.01mol / L; and after the system is mixed evenly, carbonization is performed continuously until the pH value is 6.5-7.0, filtration is performed, the filtrate is the refined heavy magnesium solution, and the residue is light calcium carbonate. By adding oxalic acid in the digesting process, the technical problem of the dolomite carbonization method that calcium and magnesium are difficult to separate thoroughly can be solved. The process is simple, is easy to control and has high magnesium oxide extraction rate and high product purity.

Description

technical field [0001] The invention relates to a process for mineral processing and utilization, in particular to a process for preparing high-purity magnesium carbonate from dolomite. Background technique [0002] The molecular formula of basic magnesium carbonate is xMgCO 3 ·yMg(OH) 2 ·zH 2 O, the value of x is 3~5, the value of y is approximately 1, and the value of z is 3~7. As an important inorganic chemical product, basic magnesium carbonate is not only used as a raw material for preparing high-purity magnesia and magnesium salt series products, but also can be used as an additive or improver for rubber, medicine, insulating materials, food and various chemical products , a wide range of applications. At present, the production process of basic magnesium carbonate is mainly carbonization method, and the main raw materials are magnesite, serpentine and dolomite. Although the reserves of magnesite are abundant, the country has limited protection policies for its de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/24
Inventor 余红发武金永吴成友董金美李颖
Owner 内蒙古昶泰资源循环再生利用科技开发有限责任公司
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