Method for preparing metal magnesium and boron-enriched material from ascharite serving as raw material by vacuum thermal reduction method

Abstract

The invention discloses a method for preparing a metal magnesium and a boron-enriched material from ascharite serving as a raw material by a vacuum thermal reduction method, and belongs to the technical field of vacuum metal thermal reduction magnesium smelting. The method comprises the following steps of: (1) preparing materials; (2) grinding the materials; (3) calcining; (4) crushing the calcined blocks into the grain diameter of less than 0.2 mm, uniformly mixing the calcined blocks and aluminum powder with the grain diameter of less than 0.2 mm, and pressing into blocks; (5) performing vacuum reduction; (6) leaching slag; (7) filtering and separating; (8) drying; and (9) performing seed decomposition or carbon decomposition, and making the filtered solution of NaAl(OH)4 which contains a small amount of Na2CO3 and NaOH enter a seed decomposition or carbon decomposition container to ensure that the NaAl(OH)4 is decomposed into aluminum hydroxide (Al(OH)3). The method for extracting the metal magnesium and preparing a low-magnesium boron-enriched material from the ascharite can comprehensively utilize ascharite ore.

Description

technical field [0001] The invention belongs to the technical field of vacuum metal thermal reduction magnesium smelting, and in particular relates to a method for producing metal magnesium and boron-rich materials by using a vacuum thermal reduction method of low-silicon and high-magnesium boronite. technical background [0002] Boronite is a mineral containing magnesium and boron whose main component is magnesium borate. At present, boronite is mainly used to produce borax through the carbon-soda method. This method has a low recovery rate of boron during the leaching process and can only The boron in boronite is utilized, and a large amount of magnesium enters the slag (that is, boron mud), and a large amount of boron mud is produced in the process of producing borax. At present, the boron mud has not been effectively used, and it can only be piled up to cause serious damage to the ecological environment. . [0003] In the alkali-free glass fiber industry, alkali-free gl...

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Problems solved by technology

[0002] Boronite is a mineral containing magnesium and boron whose main component is magnesium borate. At present, boronite is mainly used to produce borax through the carbon-soda method. This method has a low recovery rate of boron during the leaching process and can only The boron in boronite is utilized, and a large amount of magnesium enters the slag (that is, boron mud), and a large amount of boron mud is produced in the process of producing borax. At present, the boron mud has not been effectively used, and it can only be piled up to cause serious damage to the ecological environment.

[0003] In the alkali-free glass fiber industry, alkali-free glass fiber is a kind of B 2 o 3 , CaO, SiO 2 and Al 2 o 3 Compounds composed of other substances, which require a boron oxide content of 8.8%. At present, boron in glass fibers is added in the form of boric acid or calcium borate. These two products are expensive and cause high cost of alkali-free glass fibers. Therefore, over the years The building material industry has always wanted to use boronite as a substitute for boric acid or calcium borate to reduce the cost of alkali-free glass fiber, but all failed because the magnesium content in boronite is too high

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