Method for producing series magnesia chemical products by using material containing magnesium

A technology for chemical products and materials, applied in the field of comprehensive utilization of magnesium-containing resources, can solve the problems of negative product generation, large amount of sulfuric acid, and low leaching rate, and achieve good product quality, reduced equipment investment, and significant economic benefits

Inactive Publication Date: 2010-03-31
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dried boron mud is in the form of fine powder, which will be scattered by the wind and cause pollution to the environment.
At present, boron mud is mainly used in the following aspects: (1) for mixing mortar, brick making, concrete, roadbed and cement filler; (2) for the preparation of wear-resistant, corrosion-resistant glass and architectural decorative glass, refractory materials, heat insulation materials , thermal insulation materials,

Method used

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  • Method for producing series magnesia chemical products by using material containing magnesium
  • Method for producing series magnesia chemical products by using material containing magnesium

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The raw material is boron mud produced in Liaoning, the composition is (mass fraction): MgO 41%, CO 2 30%, SiO 2 19%, B 2 o 3 2%, Fe 2 o 3 4.0%, CaO 1.8%, Al 2 o 3 2.2%.

[0038] Take an appropriate amount of boron mud and heat it to 900°C for calcination for 5 hours. The product is cooled, ground and mixed evenly with ammonium sulfate. The molar ratio of magnesium oxide to ammonium sulfate is 1:0.7. Raise the temperature of the mixed material to 450° C. and keep it warm for 7 hours to carry out the roasting reaction. The gas released during the reaction process is absorbed by water and used as a raw material for preparing magnesium hydroxide by precipitating magnesium sulfate solution. The product was cooled, dissolved in deionized water, and then subjected to solid-liquid separation under reduced pressure. The filtrate is magnesium sulfate solution, and the filter residue is silicon dioxide, boron oxide, calcium oxide, iron oxide, aluminum oxide and a smal...

Embodiment 2

[0045] The raw material is boron mud produced in Liaoning, the composition is (mass fraction): MgO42%, CO 2 31%, SiO 2 18%, B 2 o 3 2%, Fe 2 o 3 3.5%, CaO 1.5%, Al 2 o 3 2%.

[0046] Take an appropriate amount of boron mud and heat it to 900°C for calcination for 5 hours. The product is cooled, ground and mixed evenly with ammonium sulfate, the molar ratio of magnesium oxide to ammonium sulfate is 1:0.9. Raise the temperature of the mixed material to 500°C and keep it warm for 5 hours, and carry out the roasting reaction. The gas released during the reaction process is pressurized and liquefied, and used as a raw material for preparing magnesium hydroxide by precipitating magnesium sulfate solution. The product was cooled, dissolved in deionized water, and then subjected to solid-liquid separation under reduced pressure. The filtrate is magnesium sulfate solution, and the filter residue is silicon dioxide, boron oxide, calcium oxide, iron oxide, aluminum oxide and...

Embodiment 3

[0053] The raw material is magnesite produced in Liaoning, the composition is (mass fraction) MgO 47.6%, CO 2 45.8%, SiO 2 5.2%, CaO 0.889%, Fe 2 o 3 0.511%.

[0054] Crush the magnesite, heat it to 1100°C and calcinate for 6 hours, cool the product, grind it finely and mix it evenly with ammonium sulfate, the molar ratio of magnesium oxide to ammonium sulfate is 1:0.7. Raise the temperature of the mixed material to 450° C. and keep it warm for 7 hours to carry out the roasting reaction. The gas released during the reaction process is absorbed by water and used as a raw material for preparing magnesium hydroxide by precipitating magnesium sulfate solution. The product is cooled, dissolved in deionized water, and then subjected to solid-liquid separation under reduced pressure. The filtrate is magnesium sulfate solution, and the filter residue is silicon dioxide, calcium oxide, iron oxide, aluminum oxide and a small amount of unreacted magnesium oxide. Recover silica. P...

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Abstract

The invention relates to a method for producing a series of magnesia chemical products by using material containing magnesium. The method comprises the following steps: (1) crushing material (such asboric sludge, baudisserite and brucite) containing magnesium, calcining to obtain light calcinesia magnesia, and finely grinding or directly crushing and levigating the material containing (for example, soapstone) magnesium; (2) mixing the levigated materials containing magnesium with ammonium sulfate, and baking; (3) dissolving the baked product in water and filtering; (4) evaporating filtrate, concentrating and crystallizing to prepare magnesium sulfate; (5) dehydrating the magnesium sulfate, and calcining to prepare magnesium oxide; (6) mixing magnesium sulfate filtrate with an ammonium bicarbonate solution, and pyrolyzating to prepare basic magnesium carbonate; (7) adding ammonia water in a magnesium sulfate solution to prepare magnesium hydroxide; (8) carbonating and pyrolyzating themagnesium hydroxide to prepare high-purity basic magnesium carbonate; and (9) calcining magnesium hydroxide to prepare high-purity magnesium oxide. The high-purity magnesium oxide prepared by the method has high purity, good quality and high additional value, and the high-efficient and deep utility of the materials containing magnesium is realized. As byproducts, ammonia and ammonium sulfate are recycled, and the closed cycle is realized in the technological process which is an environment-firendly process flow. The method has simple process flow, less investment and easy realization of industrialized production.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of magnesium-containing resources, in particular to a method for producing magnesium sulfate, basic magnesium carbonate, magnesium hydroxide and magnesium oxide series magnesium chemical products from magnesium-containing materials. Background technique [0002] my country is rich in magnesium resources, which are distributed in all provinces and regions of the country, accounting for more than 50% of the world, especially in Liaoning Province, which is rich in magnesium resources such as boron magnesium ore, magnesite, brucite, talc, and boron mud. [0003] Boron mud is the waste produced after using boron magnesium ore to produce boron chemical products such as borax or boric acid. According to different production processes, boron mud is strongly acidic or alkaline, and its main component is (mass fraction) MgO 35-39% , CO 2 29-31%, SiO 2 18-20%, B 2 o 3 2~5%, Fe 2 o 3 ...

Claims

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Application Information

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IPC IPC(8): C01F5/14C01F5/40C01F5/06C01F5/24
Inventor 王伟翟玉春顾惠敏
Owner NORTHEASTERN UNIV
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