Method for preparing flame retardant grade magnesium hydroxide

A technology of magnesium hydroxide and flame-retardant grade, which is applied in the field of preparation of flame-retardant magnesium hydroxide, which can solve the problems of pollution, a large amount of magnesium oxide, waste environment, etc., and achieve the effects of simple equipment, environmental protection and waste avoidance

Active Publication Date: 2015-07-01
上海永青环保新材料有限公司
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Problems solved by technology

[0003] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing flame-retardant magnesium hydroxide, and the method for preparing fla...

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  • Method for preparing flame retardant grade magnesium hydroxide

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Embodiment Construction

[0019] like figure 1 As shown, the present invention discloses a method for preparing flame-retardant magnesium hydroxide. The specific process is as follows: calcining the magnesia waste for oriented silicon steel in a muffle furnace 1 at 650°C for 5 hours to remove the carbon inside; then cooling, Under the condition of heating to 60°C and constant stirring, dissolve with hydrochloric acid in the dissolution tank 2, and the excess of hydrochloric acid is 1.25 times; then precipitate in the first sedimentation tank 3, the settling time is 5h, and remove the insoluble matter, including B, C, TiO 2 etc.; then add ammoniacal liquor in the above-mentioned solution in the first reaction tank 4, the proportioning of ammoniacal liquor is strong ammoniacal liquor: water=1:50, and the ammoniacal liquor amount is 1 / 25 of solution amount, and constantly feeds compressed air (makes Fe 2+ converted to Fe 3+ ), by controlling PH=9 to make Fe 3+ completely precipitated while Mg 2+ No pre...

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Abstract

The invention provides a method for preparing flame retardant grade magnesium hydroxide. The method comprises the following steps: calcining the oriented silicon steel in a muffle furnace by use of magnesium oxide wastes, next, cooling, adding the calcined silicon steel magnesium oxide to a dissolving tank by use of the magnesium oxide wastes, dissolving by use of an acid, adding the dissolved magnesium oxide wastes to a settling tank for settling, removing the undissolved substances, guiding the solution into a reaction tank, adding ammonia water, and continuously introducing compressed air so that Fe<2+> can be transformed into Fe<3+>, controlling the pH so that the Fe<3+> is completely settled and Mg<2+> is not settled, removing Fe(OH)3 precipitate, next, adding ammonia water, ethanol and a surfactant to the solution obtained after settlement in the reaction tank, controlling the pH so that the Mg<2+> can be completely settled, and drying Mg(OH)2 to obtain the retardant grade magnesium hydroxide. The method is used for solving the problems of the technical flow of recycling the magnesium oxide waste for the silicon steel; and the waste of resources is avoided.

Description

technical field [0001] The invention belongs to chemical technology, and in particular relates to a magnesium hydroxide, in particular to a method for preparing flame-retardant magnesium hydroxide. Background technique [0002] At present, silicon steel is widely used in our daily life, but a lot of magnesium oxide waste will be produced in the process of preparing silicon steel. It will pollute our environment and waste our resources. Flame-retardant grade magnesium hydroxide was prepared from magnesia waste for oriented silicon steel to realize resource reuse and protect the environment. Contents of the invention [0003] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing flame-retardant magnesium hydroxide, and the method for preparing flame-retardant magnesium hydroxide solves the problems that may occur in the process of silicon steel in the prior art. A large amount of magnesia wastes cause techn...

Claims

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Application Information

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IPC IPC(8): C01F5/14B09B3/00
Inventor 张娜孙玉见黄成杰付斌邱凡王娴婕李蓉
Owner 上海永青环保新材料有限公司
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