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Calcium and magnesium separation method for dolomite carbonization process and application thereof

A separation method and dolomite technology, applied in the direction of magnesium carbonate, calcium carbonate/strontium/barium, etc., can solve the problems of high equipment requirements, expensive additives, complicated secondary carbonization process, etc., and achieve the effect of reducing production costs

Inactive Publication Date: 2013-06-12
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0004] However, these methods all have certain defects, such as: the secondary carbonization process is complicated, the energy consumption increases, and the equipment investment is high; The calcium and magnesium separation effect of the method is not obvious; the practical value of the rotating packed bed carbonization method remains to be studied; when adding organic or inorganic additives, when adding soluble oxalic acid or oxalate to separate calcium and magnesium during the carbonization process, the price of the additive itself Expensive and not recyclable (e.g. oxalate additive reacts with calcium ions to form calcium oxalate), resulting in increased production costs

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  • Calcium and magnesium separation method for dolomite carbonization process and application thereof

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preparation example Construction

[0019] The preparation of refined magnesium emulsion can adopt the routine treatment method known to those skilled in the art to carry out. Specifically, for example, the dolomite can be mechanically crushed to a size of 1-10 cm with a crusher first, and generally can be relatively uniform particles of about 2-5 cm. Then it is calcined at 850-1100°C to become calcined white. The calcination temperature and calcination time can be selected and determined by those skilled in the art according to specific conditions, for example, calcination can be performed at 900-1000° C. for 0.5-5 hours, or 1-3 hours. Digestion refers to mixing calcined white with water to make pulp, which can be properly heated and supplemented with stirring to promote digestion. Specific digestion conditions can also be selected and determined by those skilled in the art according to actual conditions. For example, the mass ratio of water to calcined white may be in the range of 30-70:1. The digestion sol...

Embodiment 1

[0042] Inject CO into the refined magnesium emulsion at room temperature 2 , CO 2 The flow rate is 0.5L / min, and the pH of the refined magnesium emulsion is tracked and tested. The initial pH is 13.0; when the pH of the system reaches 12.5, add acetylacetone, and the concentration of acetylacetone in the system is 0.003mol / L; shake well and continue carbonization until the pH of the system is 8.5, then carry out suction filtration and separation, and the filter residue is light Calcium carbonate, the filtrate is the refined heavy magnesium water, which is reserved for the next step. The calcium-magnesium ratio of the refined heavy magnesium water is 1:150.

[0043] Continue to feed carbon dioxide into the refined heavy magnesium water until the pH of the system is 6.9. After pyrolysis, suction filtration, and drying, high-purity basic magnesium carbonate is obtained. The chemical composition and content of basic magnesium carbonate are: MgO-42.27%, CaO-0.40%, Fe-0.02%, reac...

Embodiment 2

[0045] Inject CO into the refined magnesium emulsion at room temperature 2 , CO 2 The flow rate is 0.5L / min, and the pH of the refined magnesium emulsion is tracked and tested. The initial pH is 12.78; when the pH of the system reaches 10, add acetylacetone, and the concentration of acetylacetone in the system is 0.006mol / L; shake well and continue carbonization until the pH of the system is 7.5, then carry out suction filtration and separation, and the filter residue is light Calcium carbonate, the filtrate is the refined heavy magnesium water, which is reserved for the next step. The calcium-magnesium ratio of the refined heavy magnesium water is 1:235.

[0046] Continue to feed carbon dioxide into the refined heavy magnesium water until the pH of the system is 7.0. After pyrolysis, suction filtration, and drying, high-purity basic magnesium carbonate is obtained. The chemical composition and content of basic magnesium carbonate are: MgO-41.30%, CaO-0.375%, Fe-0.009%, rea...

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Abstract

The invention discloses a calcium and magnesium separation method for a dolomite carbonization process. The dolomite is crushed, calcined, and digested to a refined magnesium emulsion. The calcium and magnesium separation method comprises the following steps of: S1, introducing carbon dioxide into the refined magnesium emulsion until the pH is 12.5 to 9.5 to obtain a preliminary carbonization system; S2, adding acetylacetone to the preliminary carbonization system, and mixing to obtain a mixed system; and S3, introducing carbon dioxide to the mixed system until pH is 9.5 to 7.5 to produce calcium carbonate solids, and separating the solids, wherein a liquid phase is refined heavy magnesium water. According to the invention, acetylacetonate additives are added in the carbonization treatment of the refined magnesium emulsion, and the pH of the system is strictly controlled in the carbonization process, so that the efficient separation of calcium and magnesium is realized conveniently, the additives can be easily separated and recovered, and the production cost is greatly lowered.

Description

【Technical field】 [0001] The invention relates to the technical field of mineral processing, in particular to a method for separating calcium and magnesium in a dolomite carbonization process and its application in preparing high-purity basic magnesium carbonate. 【Background technique】 [0002] Dolomite is a mineral containing magnesium and calcium, which can be used as a raw material for extracting magnesium and magnesium oxide, and is usually processed by carbonization. The process of dolomite carbonization method mainly includes: calcining dolomite at high temperature to obtain magnesium oxide and calcium oxide; obtaining refined magnesium emulsion through digestion and pulping; passing CO into the refined magnesium emulsion in the carbonization tower 2 Carry out carbonization to make Ca(OH) 2 into CaCO 3 After precipitation, filter and remove, and the filtrate is refined heavy magnesium water (mainly containing Mg(HCO 3 ) 2 ); the filtrate is further processed to obt...

Claims

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Application Information

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IPC IPC(8): C01F11/18C01F5/24
Inventor 郑利娜余红发李颖吴成友董金美文静谭永山
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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