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Preparing device and method for flame-retardant grade magnesium hydrate

A magnesium hydroxide and preparation device technology, applied in the direction of magnesium hydroxide, can solve the problems of high investment, difficult product performance, high production cost, etc., and achieve good economic benefits, good product quality, and quick results

Active Publication Date: 2016-07-06
SHENYANG XINBO IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The precipitation method is prepared by using soluble magnesium salt and alkali chemical reaction, and its disadvantages are: large environmental pollution and high production cost; the hydrothermal method is to use magnesium-rich non-metallic ore, which is decomposed into active light-burned magnesia by heating It is prepared by adding water for digestion, and its disadvantages are: long process, high investment, and low product quality
According to the information published by the patent, this method is a precipitation method, that is, light-burned magnesium oxide is first hydrated to produce magnesium hydroxide, magnesium hydroxide is then reacted with sulfuric acid to produce magnesium sulfate, and magnesium sulfate is then reacted with ammonium to produce Magnesium hydroxide slurry is washed and filtered to remove impurities. Its disadvantages are strong corrosion of sulfuric acid and high investment; the prepared magnesium hydroxide has no surface modification measures, so it is difficult to filter and product performance is difficult to guarantee; the process is long and the investment in infrastructure is large

Method used

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  • Preparing device and method for flame-retardant grade magnesium hydrate

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Experimental program
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Effect test

Embodiment 1

[0051] A preparation device for flame-retardant magnesium hydroxide, comprising the following units: roasting unit I, digestion unit II, filtration unit III, drying unit IV and control unit; digestion unit II includes a feed inlet, a feed outlet and a filtrate Inlet, filtration unit III includes feed inlet, discharge outlet and filtrate outlet; the outlet of roasting unit I is connected to the inlet of digestion unit II, and the outlet of digestion unit II is connected to the inlet of filtration unit III , the discharge port of filter unit III is connected with the feed port of drying unit IV, and the filtrate outlet of filter unit III is connected with the filtrate inlet of digestion unit II; roasting unit I, digestion unit II, filter unit III, and drying unit IV are all connected with control unit connection;

[0052] Roasting unit I, used for drying and roasting of raw materials, including dispersing dryer, cyclone dust collector, bag filter, exhaust fan, roasting furnace, ...

Embodiment 2

[0069] The device that adopts is with embodiment 1.

[0070] A preparation method of flame-retardant grade magnesium hydroxide, using the above-mentioned device, specifically comprises the following steps:

[0071] Step 1, roasting:

[0072] (1) The by-products produced in the boron chemical production process are continuously fed into the dispersing dryer of the roasting unit for drying. The drying temperature is 750°C, and the moisture content of the dried material is 6%. Among them, the boron chemical production process The by-product that produces in, by mass ratio, basic magnesium carbonate: brucite=9: 1, two kinds of compositions account for the mass percent of mixture and be 98.5%, attached water is 75%, and main harmful impurity is that TFe is 0.02%, CaO 0.32%, the rest is Al 2 o 3 , SiO 2 , fineness 100%≤1μm;

[0073] (2) The dried material enters the roasting furnace of the roasting unit, the roasting temperature is 750°C, and the roasting time is 60s to obtain ...

Embodiment 3

[0083] The device that adopts is with embodiment 1.

[0084] A preparation method of flame-retardant grade magnesium hydroxide, using the above-mentioned device, specifically comprises the following steps:

[0085] Step 1, roasting:

[0086] (1) The by-products produced in the boron chemical production process are continuously fed into the dispersing dryer of the roasting unit for drying. The drying temperature is 900°C, and the moisture content of the dried material is 6%. Among them, the boron chemical production process The by-product that produces in, wherein, by mass ratio, basic magnesium carbonate: brucite=7: 3, two kinds of compositions account for the mass percentage of mixture and be 98%, attached water is 75%, and main harmful impurity is that TFe is 0.03% , CaO is 0.42%, the rest is Al 2 o 3 , SiO 2 , fineness 100%≤1μm;

[0087] (2) The dried material enters the roasting furnace of the roasting unit, the roasting temperature is 900°C, and the roasting time is ...

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Abstract

The invention relates to a preparing device and method for flame-retardant grade magnesium hydrate. The preparing device comprises a roasting unit, a digesting unit, a filtering unit, a drying unit and a control unit. With the device adopted, the preparing method comprises the following steps that a byproduct, namely, a mixture of 4MgCO3.Mg(OH)2.4H2O and Mg(OH)2, generated in the boron chemical production process serves as a raw material, the raw material is dried and roasted through the roasting unit, and active magnesium oxide is obtained; active magnesium oxide is digested and modified through the digesting unit, and magnesium hydrate paste is obtained; the magnesium hydrate paste is filtered through a belt vacuum filtering machine of the filtering unit, and a wet magnesium hydrate material is obtained; the wet magnesium hydrate material is dried in a scattering and drying machine of the drying unit, and flame-retardant grade magnesium hydrate is obtained. According to the method, the byproduct, namely, the mixture of 4MgCO3.Mg(OH)2.4H2O and Mg(OH)2, generated in the boron chemical production process is used, so that the additional value of the product is increased, the product quality is improved, the technological process is simple, project investment is reduced, and economic benefits are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a preparation device and method of flame-retardant magnesium hydroxide. Background technique [0002] As an important inorganic compound, magnesium hydroxide can be widely used in the fields of organic flame retardants such as plastics and wastewater treatment. The method for preparing magnesium hydroxide can be roughly divided into precipitation method and hydrothermal method. The precipitation method is prepared by using soluble magnesium salt and alkali chemical reaction, and its disadvantages are: large environmental pollution and high production cost; the hydrothermal method is to use magnesium-rich non-metallic ore, which is decomposed into active light-burned magnesia by heating It is prepared by adding water for digestion, and its disadvantages are: long process, high investment, and low product quality. [0003] my country is relatively ...

Claims

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Application Information

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IPC IPC(8): C01F5/14
CPCC01F5/14
Inventor 王新军刘鹤群郭建强程云驰邹成
Owner SHENYANG XINBO IND TECH