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Process for preparing magnesium hydroxide by light burning bitter spar and concentrated sea water

A technology of lightly burning dolomite and magnesium hydroxide, applied in the direction of magnesium hydroxide, etc., can solve the problems of high product consumption, high lime quality requirements, cumbersome seed preparation, etc., to achieve high resource utilization, stable product quality, The effect of low production cost

Inactive Publication Date: 2004-12-15
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has disadvantages such as cumbersome preparation of seed crystals (requires more than 7 times of cyclic preparation, otherwise it will be difficult to settle and separate the magnesium hydroxide obtained), high product consumption, and high quality requirements for lime.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The dolomite is calcined in a muffle furnace at a temperature of 950° C. The composition of the calcined dolomite is: MgO 41.40%, CaO 58.28%. Place the 2500ml beaker on the electric stove, pour 1300ml water into the beaker, and put the Mg(OH) 2 6.5 g of magnesium hydroxide slurry was seeded into the water. Open the stirrer in the beaker, the stirring speed is 100 rev / min, after stirring evenly, add above-mentioned 100 grams lightly burned dolomite. Turn on the electric furnace for heating, stop heating when it reaches 70°C, and continue stirring for 1.5 hours, the temperature of the dolomite milk is 75°C. The above-mentioned dolomite milk is filtered with a 100-mesh sieve, and the residue on the sieve is discarded to obtain 1250 ml of dolomite milk under the sieve, which is used as a raw material for preparing magnesium hydroxide.

[0028] Take dolomite milk and analyze its composition: Mg(OH) 2 21.00g / l, Ca(OH) 2 44.52g / l. Take 10 liters of concentrated seawater, ...

Embodiment 2

[0030] Dolomite (MgO 20%, CaO 30%) is calcined in a muffle furnace at a calcination temperature of 1000°C. The composition of the calcined light-burned dolomite is: MgO 43%, CaO 54.5%. Place the 2500ml beaker on the electric stove, pour 1300ml water into the beaker, and put the Mg(OH) 2 The magnesium hydroxide slurry of 15g is added into water as crystal seed, put into and stir in the beaker. Turn on the stirrer, the stirring speed is 100 rpm, after stirring evenly, add the above-mentioned 180 grams of lightly burned dolomite. Turn on the electric furnace for heating, stop heating when it reaches 80°C, and continue stirring for 3 hours, the temperature of the dolomite milk is 80°C. The above-mentioned dolomite milk is filtered with a 100-mesh sieve, and the residue on the sieve is discarded to obtain 1250 ml of dolomite milk under the sieve, which is used as a raw material for preparing magnesium hydroxide.

[0031] Take dolomite milk and analyze its composition: Mg(OH) 2 3...

Embodiment 3

[0033] Dolomite (MgO 20%, CaO 30%) is calcined in a muffle furnace at a calcination temperature of 1050°C. The composition of the calcined light-burned dolomite is: MgO 42%, CaO 54%. Place the 2500ml beaker on the electric stove, pour 1300ml water into the beaker, and put the Mg(OH) 2 The magnesium hydroxide slurry of 25g joins in water as crystal seed, puts into and stirs in the beaker. Turn on the stirrer, the stirring speed is 100 rev / min, after stirring evenly, add above-mentioned 260 grams of lightly burned dolomite. Turn on the electric furnace for heating, stop heating when it reaches 90°C, and continue stirring for 5 hours, the temperature of the dolomite milk is 85°C. The above-mentioned dolomite milk is filtered with a 100-mesh sieve, and the residue on the sieve is discarded to obtain 1250ml of dolomite milk under the sieve, which is used as a raw material for preparing magnesium hydroxide.

[0034] Take dolomite milk and analyze its composition: Mg(OH) 2 45.35g / ...

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Abstract

The preparation process includes mixing light burnt bitter spar and water, heating to 70-90 deg.c and nitration to prepare bitter spar emulsion; wet sieving to eliminate impurity and adding concentrated sea water to produce magnesium hydroxide; precipitation, concentration and filtering to obtain pasty magnesium hydroxide; and further processing via different methods to obtain different magnesium hydroxide products. The present invention has low cost.

Description

technical field [0001] The present invention relates to a kind of magnesium hydroxide [Mg(OH) 2 ] Preparation method, especially related to the method of utilizing dolomite to prepare magnesium hydroxide. Background technique [0002] At present, dolomite is mainly used in the production of light magnesium carbonate, light magnesium oxide and magnesium hydroxide in chemical production. [0003] The process of directly producing magnesium hydroxide from dolomite is as follows: calcining dolomite at a temperature below 750°C to obtain dolomite lime; digesting dolomite lime and removing sediment to obtain magnesium hydroxide suspension, and then filtering the magnesium hydroxide suspension Separate and dry to obtain magnesium hydroxide. Because the magnesium hydroxide suspension after deslagging entrains some impurities such as calcium carbonate, the quality of the obtained magnesium hydroxide is relatively poor. Therefore, the direct production of magnesium hydroxide from do...

Claims

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Application Information

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IPC IPC(8): C01F5/14C01F5/16
Inventor 黄西平张琦郭淑元王功伟
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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