Method for preparing magnesia for magnesium cement by using bischofite and dolomite

A bischofite and dolomite technology, applied in the direction of magnesium oxide, etc., can solve the problems of low raw material utilization rate, high production cost, and long process flow, and achieve the effect of low equipment requirements, low price, and easy raw material acquisition

Inactive Publication Date: 2012-06-20
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separate production of magnesium oxide for magnesium cement from salt lake magnesium chloride has problems such as long process flow, low utilization rate of raw materials, high production cost, and environmental pollution, which cannot compete with magnesia or Portland cement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 A method for preparing magnesium oxide for magnesium cement by bischofite and dolomite, comprising the following steps:

[0019] (1) Grind dolomite calcined at 900°C into 50-60 mesh dolomite powder; take 100 grams of the dolomite powder and put it into a beaker, and add 600 grams of calcium chloride solution to the above-mentioned beaker filled with dolomite powder It is digested into caustic dolomite lime milk at a temperature of 30°C to 40°C.

[0020] Wherein: calcium chloride content is 3% in the calcium chloride solution.

[0021] (2) Prepare magnesium chloride solution: dissolve bischofite with water to a specific gravity of 1.19g / cm 3 magnesium chloride solution.

[0022] (3) 600 grams of magnesium chloride solution obtained in step (2) are added to the above-mentioned beaker, and the beaker is placed in a HH-S6 type constant temperature water bath, and the temperature of the water bath is 30 ° C and the rotating speed is 100 rpm. The reaction was ...

Embodiment 2

[0026] Embodiment 2 A method for preparing magnesium oxide for magnesium cement by bischofite and dolomite, comprising the following steps:

[0027] (1) Grind dolomite calcined at 950°C into 50-60 mesh dolomite powder; take 100 grams of the dolomite powder and put it into a beaker, and add 540 grams of calcium chloride solution to the above-mentioned beaker filled with dolomite powder It is digested into caustic dolomite lime milk at a temperature of 30°C to 40°C.

[0028] Wherein: calcium chloride content is 4% in the calcium chloride solution.

[0029] (2) Prepare magnesium chloride solution: dissolve bischofite with water to a specific gravity of 1.20g / cm 3 magnesium chloride solution.

[0030] (3) 600 grams of magnesium chloride solution obtained in step (2) are added to the above-mentioned beaker, and the beaker is placed in a HH-S6 type constant temperature water bath, and the temperature of the water bath is 35 ° C and the rotating speed is 150 rpm. The reaction was ...

Embodiment 3

[0034] Embodiment 3 A method for preparing magnesium oxide for magnesium cement by bischofite and dolomite, comprising the following steps:

[0035] (1) Grind dolomite calcined at 1000°C into 50-60 mesh dolomite powder; take 100 grams of the dolomite powder and put it into a beaker, and add 450 grams of calcium chloride solution to the above-mentioned beaker filled with dolomite powder It is digested into caustic dolomite lime milk at a temperature of 30°C to 40°C.

[0036] Wherein: calcium chloride content is 5% in the calcium chloride solution.

[0037] (2) Prepare magnesium chloride solution: dissolve bischofite with water to a specific gravity of 1.22g / cm 3 magnesium chloride solution.

[0038] (3) 600 grams of magnesium chloride solution obtained in step (2) are added to the above-mentioned beaker, and the beaker is placed in a HH-S6 type constant temperature water bath, and the temperature of the water bath is 40 ° C and the rotating speed is 180 rpm. The reaction was...

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Abstract

The invention relates to a method for preparing magnesia for magnesium cement by using bischofite and dolomite. The method comprises the following steps of: (1) grinding dolomite calcined at the temperature of 900-1,000 DEG C into dolomite powder, and digesting the dolomite powder into caustic dolomite lime milk with a calcium chloride solution; (2) preparing a magnesium chloride solution, dissolving bischofite with water into a magnesium chloride solution of which the specific weight is 1.19-1.23 g/cm<3>; (3) reacting the magnesium chloride solution obtained in the step (2) with the caustic dolomite lime milk obtained in the step (1) while stirring in a constant-temperature water bath to generate a magnesium hydrate precipitate; (4) washing the magnesium hydrate precipitate with water for multiple times, and performing suction filtration to obtain a filter cake; and (5) drying the filter cake, calcining at the temperature of 500-600 DEG C for 2-4 hours to obtain a sinter, naturally cooling the sinter, smashing and packaging to obtain magnesia for magnesium cement. The method has the advantages of simple process, good product quality, low cost and easiness for realizing industrial production.

Description

technical field [0001] The invention relates to a preparation method of a magnesium compound, in particular to a method for preparing magnesium oxide for magnesium cement from bischofite and dolomite. Background technique [0002] The large-scale utilization of magnesium chloride in salt lakes has always been a hot research topic for domestic and foreign scientific and technological personnel. Magnesium chloride has a wide range of uses. Magnesium chloride can be used to process metal magnesium, high-purity magnesia, magnesium hydroxide, light magnesium carbonate, magnesium cement, edible magnesium chloride, magnesium chloride-type snow-melting and dust-proof agent, etc., but due to limitations in cost and technology At present, the largest amount of magnesium chloride is used in the magnesium cement industry. [0003] The main raw materials for the production of magnesium cement are magnesium oxide and magnesium chloride. At present, magnesium oxide for the production of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/08C04B2/10
Inventor 都永生孙庆国火焱周园肖学英李明珍韩继龙王世栋
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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