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Method for preparing magnesium hydroxide utilizing light-burned dolomite powder

A light-burned dolomite powder and magnesium hydroxide technology, which is applied in the direction of magnesium hydroxide, can solve the problems of difficult control of the ratio of strong alkali and uneven structure of magnesium hydroxide, and achieve easy control of reaction conditions, environmental protection, and high purity high effect

Inactive Publication Date: 2011-11-30
WUHAN IRON & STEEL (GROUP) CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure of the magnesium hydroxide prepared by this patent is not uniform, and in the preparation process, the ratio of strong alkali in the molten state is not easy to control

Method used

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  • Method for preparing magnesium hydroxide utilizing light-burned dolomite powder
  • Method for preparing magnesium hydroxide utilizing light-burned dolomite powder
  • Method for preparing magnesium hydroxide utilizing light-burned dolomite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Pour 60g of light-burned dolomite powder into 1 liter of water at 70°C and digest it for 40 minutes to obtain light-burned dolomite emulsion;

[0026] 2) Introduce carbon dioxide into the light-burned dolomite lime emulsion, and control the gas flow of carbon dioxide to 40-50L h -1 , stirring while passing, the stirring speed is controlled as 150r / min, the pH value of the reaction mixture is detected while feeding carbon dioxide, and when the pH=6.89, the carbon dioxide is stopped, the filter residue calcium carbonate is removed, and the heavy magnesium aqueous solution is left to complete Calcium and magnesium are separated for the first time and most of the impurities and calcium ions are removed;

[0027] 3) Take the heavy magnesium aqueous solution, add absolute ethanol equivalent to 40% of the volume of the heavy magnesium aqueous solution, heat it in a water bath and control the temperature of the water bath to 80°C and pyrolyze it for 1 hour, then filter to ob...

Embodiment 2

[0033] 1) Pour 60g of light-burned dolomite powder into 1 liter of water at 55°C and digest it for 50 minutes to obtain light-burned dolomite emulsion;

[0034] 2) Introduce carbon dioxide into the light-burned dolomite lime emulsion, and control the gas flow of carbon dioxide to 70-80L h -1, stirring while passing, the stirring speed is controlled to be 160r / min, and the pH value of the reaction mixture is detected while feeding carbon dioxide, and when the pH=6.94, the carbon dioxide is stopped, the filter residue calcium carbonate is removed, and the heavy magnesium aqueous solution is left to complete Calcium and magnesium are separated for the first time and most of the impurities and calcium ions are removed.

[0035] 3) Take the heavy magnesium aqueous solution, add absolute ethanol equivalent to 30% of the volume of the heavy magnesium aqueous solution, heat it in a water bath and control the temperature of the water bath to 60°C and pyrolyze it for 1.5 hours, then fil...

Embodiment 3

[0041] 1) Pour 60g of light-burned dolomite powder into 1 liter of water at 65°C and digest it for 45 minutes to obtain light-burned dolomite emulsion;

[0042] 2) Introduce carbon dioxide into the light-burned dolomite lime emulsion, and control the gas flow of carbon dioxide to 60-70L h -1 , stirring while passing, the stirring speed is controlled as 150r / min, the pH value of the reaction mixture is detected while passing into carbon dioxide, and when the pH=6.70, the carbon dioxide is stopped, the filter residue calcium carbonate is removed, and the heavy magnesium aqueous solution is left to complete Calcium and magnesium are separated for the first time and most of the impurities and calcium ions are removed;

[0043] 3) Take the heavy magnesium aqueous solution, add absolute ethanol equivalent to 35% of the volume of the heavy magnesium aqueous solution, heat it in a water bath and control the temperature of the water bath to 50° C. After pyrolysis for 2 hours, filter to...

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Abstract

The invention discloses a method for preparing magnesium hydroxide utilizing light-burned dolomite powder. The method comprises the following steps: adding the light-burned dolomite powder to enough water for digestion; introducing a carbon dioxide gas to obtained light-burned dolomite emulsion until the pH value of the reaction product is 6.7-7.0, and filtering the product; adding absolute ethanol to filtrate, heating and controlling the temperature to 50-80 DEG C, and after reaction, filtering, wherein the amount of absolute ethanol is controlled to be 30-40% of the volume of the filtrate; adding hydrochloric acid to obtained solid magnesium bicarbonate until bubbles disappear; adding a base liquid to an obtained magnesium chloride solution; and adding polyvinylpyrrolidone or ethylenediamine to obtained magnesium hydroxide slurry, wherein the amount of polyvinylpyrrolidone or ethylenediamine is equal to 2-6% the volume of the slurry; and then adding the slurry into an autoclave, controlling the temperature at 80-200 DEG C and stirring under constant temperature condition for 10-20 hours. Magnesium hydroxide precipitate prepared by the method disclosed by the invention is in a fibrous or flaky crystal shape and has high purity; and the preparation method is simple to operate, and the reaction conditions are mild and easy to control.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation, in particular to a method for preparing magnesium hydroxide by using lightly burned dolomite powder. Background technique [0002] Magnesium hydroxide has the properties of flame retardancy, smoke suppression, non-toxicity and high thermal decomposition temperature, and is widely used in polymer flame retardancy, wastewater treatment, flue gas desulfurization and other fields. However, when magnesium hydroxide is used as a filler-type inorganic flame retardant, a large amount of filler will make its dispersion in the polymer worse and reduce the mechanical properties of the composite material. Studies have shown that the modification of magnesium hydroxide and the control of particle size and morphology can improve this shortcoming. When the added magnesium hydroxide particle size is reduced to 1 μm, the oxygen index of the flame retardant polymer system is significantly in...

Claims

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Application Information

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IPC IPC(8): C01F5/14
Inventor 章启忠刘家祥饶发明勇昕伍朝蓬李敏季佳善
Owner WUHAN IRON & STEEL (GROUP) CORP
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