Method for producing high-activity nano magnesia by utilizing low-grade magnesite

A nano-magnesium oxide and magnesite technology, applied in magnesium oxide, magnesium hydroxide and other directions, can solve the problems of mine vegetation restoration and low comprehensive utilization of resources, and achieve the effect of high added value and high quality.

Inactive Publication Date: 2011-01-12
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

The problem of mine vegetation restoration is serious, and the comprehensive utilization of resources is not high

Method used

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  • Method for producing high-activity nano magnesia by utilizing low-grade magnesite
  • Method for producing high-activity nano magnesia by utilizing low-grade magnesite
  • Method for producing high-activity nano magnesia by utilizing low-grade magnesite

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Embodiment approach

[0051] Take 100g of lightly burned powder (magnesia content between 65%-80%), add dilute sulfuric acid made of 120ml of water and 60-120ml of concentrated sulfuric acid, heat to 75°C, react for 2h, filter while hot to remove insoluble matter, A crude magnesium sulfate solution 1 was obtained.

[0052]Measure 200ml of crude magnesium sulfate solution, heat it up to 45°C-50°C, add 3-5g of MgO to the solution in several times for reaction, stir for 5 minutes, add 4ml of hydrogen peroxide dropwise, a reddish-brown precipitate is produced, filter to obtain Contains MgSO 4 The filtrate contains substantially no other impurities.

[0053] According to mass ratio 3 / 1(NH 4 HCO 3 / MgSO 4 ), adding NH to the purified magnesium sulfate filtrate 4 HCO 3 (Temperature 40°C) to generate heavy magnesium aqueous solution, add 3% (mass ratio of OP emulsifier to magnesium bicarbonate) OP emulsifier. When the temperature is 70°C to 105°C, the pyrolysis reaction of magnesium carbonate occurs,...

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Abstract

The invention relates to a method for producing high-activity nano magnesia by utilizing low-grade magnesite, in particular to a method for producing nano magnesite. The method utilizes a chemical reaction principle and comprises the following steps of: firstly, roasting low-grade magnesite or powdered ore to obtain magnesia, reacting the magnesia and sulphuric acid and filtering to obtain a magnesium sulfate solution; purifying the solution by adopting a neutralizer and an oxidant to obtain a purified magnesium sulfate solution; adding ammonium bicarbonate and a surfactant to the purified magnesium sulfate solution and roasting to obtain high-activity nano magnesia; heating and decomposing the ammonium sulfate contained filtrate obtained in the last step and light burning powder to obtain magnesium hydroxide at a flame retardant level; and filtering the magnesium hydroxide in a reactor to obtain magnesium hydroxide at an environmental protection level and recycling the filtrate without emission. Fibrous magnesium hydroxide, basic magnesium carbonate and high-activity nano magnesia are widely applied to flame retardance, smoke suppression, filling and reinforcement of rubber products, can be used as an adiabatic and high-temperature-resistant insulation material or can be used for manufacturing high-grade glass products, magnesium salts, paints, and the like.

Description

technical field [0001] The invention relates to a method for producing nano-magnesia, in particular to a method for producing high-activity and nano-magnesia by using low-grade magnesite. Background technique [0002] At present, in the use of magnesite in China, there is a problem that high-quality magnesite is over-exploited and used, while low-grade magnesite or fine ore and tailings are not fully utilized. The problem of mine vegetation restoration is serious, and the comprehensive utilization of resources is not high. Not only are there few product varieties, but the product grades are also not high. [0003] Utilizing the characteristics of chemical technology, it is developed for low-grade magnesite, especially for lightly burned powder (magnesia content between 65% and 80%) obtained by calcining low-grade (or powder) magnesite as raw material. The production of magnesia chemical products is of great significance. [0004] According to the principle of graded utili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/06C01F5/20
Inventor 王国胜宁志高
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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