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Preparation method of flame retardant magnesium hydroxide

A technology of magnesium hydroxide and flame retardant, applied in magnesium hydroxide, nitrogen fertilizer, ammonium salt fertilizer and other directions, can solve problems such as waste, and achieve the effect of reducing treatment costs and market prices

Pending Publication Date: 2021-11-09
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The factory relies on imported silicon steel grade magnesium oxide to improve the quality of oriented silicon steel and improve product competitiveness, but at the same time it causes a lot of "waste" for this high value-added product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] A preparation method of flame retardant magnesium hydroxide, comprising the steps of:

[0026] 1) Calcination to remove carbon: Calcinate the magnesia waste gas in a muffle furnace at 600°C for 2 hours to remove impurities such as black carbon. During the heating process, carbon reacts with oxygen in the air to form CO 2 At the same time, the slurry component organic matter in the waste also undergoes such reactions; the metal oxides in the waste are further oxidized into high-valent oxides, such as ferrous oxide oxidized into iron oxide. This process not only has the effect of carbon removal, but also activates the waste, which is beneficial to the subsequent acid dissolution experiment.

[0027] 2) Acid dissolution to form coarse magnesium salt: use hydrochloric acid with a concentration of 6mol / L as a dissolving agent, dissolve magnesium oxide under stirring conditions at 60°C, and finally generate coarse magnesium salt containing more impurities, especially higher i...

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Abstract

The invention discloses a preparation method of a flame retardant magnesium hydroxide. The preparation method comprises the following steps: taking magnesium oxide waste, grinding, crushing and calcining, adding the residual solid into hydrochloric acid for acid dissolution, and filtering the solution to generate precipitate; adding H2O2 into the filtered solution under the stirring condition to make the solution become yellow from green, precipitating and filtering the solution, dropwise adding ammonia water into the filtered solution to adjust the pH value to obtain a generated precipitate Mg(OH)2, and filtering and drying. Silicon steel grade magnesium oxide is recycled, so that the environmental pressure is reduced, and the preparation method is a relatively green and environment-friendly preparation scheme of the flame retardant magnesium hydroxide.

Description

technical field [0001] The invention relates to a preparation method and application of a flame retardant magnesium hydroxide prepared from silicon steel grade magnesium oxide, and belongs to the technical field of silicon steel grade magnesium oxide recovery and utilization. Background technique [0002] In recent years, many major fires have been related to polymer materials. Polymer materials are widely used due to their low cost, easy processing, good molding, and low specific gravity. Therefore, research on flame retardancy of polymer materials is imminent. [0003] The factory relies on imported silicon steel grade magnesium oxide to improve the quality of oriented silicon steel and improve product competitiveness, but at the same time it causes a lot of "waste" for this high value-added product. At the same time, the market has a strong demand for magnesium salt products such as flame-retardant magnesium hydroxide, which itself is an environmentally friendly flame r...

Claims

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Application Information

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IPC IPC(8): C01F5/20C05C3/00
CPCC01F5/20C05C3/00
Inventor 奚志雄马萱航赵旭宁张娜
Owner SHANGHAI INSTITUTE OF TECHNOLOGY