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

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 ...

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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, etc.; (3) used as a coagulant to treat domestic sewage and industrial sewage; (4) extracting magnesium oxide and silicon dioxide: leaching magnesium with a certain concentration of sulfuric acid to prepare magnesium products, the disadvantage is that the amount of sulfuric acid is large, Glauber's salt negative product is produced; soda ash and boron mud are mixed and roasted to leaching silica, the disadvantage is that the leaching rate is low

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