Method for purifying and preparing beryllium hydroxide from beryllium fluoride-containing mixture

Abstract

The invention relates to a method for purifying and preparing beryllium hydroxide from a beryllium fluoride-containing mixture, belongs to the technical field of metal beryllium metallurgy, and solves the problems that an existing beryllium hydroxide preparation technology is tedious in process and high in equipment requirement, and the purity of the prepared beryllium hydroxide is low. The method for purifying and preparing beryllium hydroxide from the beryllium fluoride-containing mixture comprises the steps: crushing and ball-milling the beryllium fluoride-containing mixture into beryllium fluoride-containing mixture powder; dissolving the beryllium fluoride-containing mixture powder with water to obtain a beryllium fluoride-containing mixture suspension; carrying out solid-liquid separation on the beryllium fluoride-containing mixture suspension to obtain a first separation solution and residues; adding ammonia water into the first separation solution to adjust the pH value, carrying out primary precipitation, and removing the primary precipitate to obtain a second separation solution; and adding ammonia water into the second separation solution to adjust the pH value, carrying out secondary precipitation, carrying out solid-liquid separation, and drying the obtained solid to obtain beryllium hydroxide. The beryllium hydroxide is prepared by smelting an intermediate product beryllium fluoride-containing mixture from beryllium ore.

Description

technical field [0001] The invention relates to the technical field of metal beryllium metallurgy, in particular to a method for purifying and preparing beryllium hydroxide from a mixture containing beryllium fluoride. Background technique [0002] Beryllium is one of the lightest metal structural materials known, featuring high strength, high modulus of elasticity, and low density. Beryllium also has good thermal shock resistance and thermal diffusivity and a very small coefficient of thermal expansion. Due to the unique properties of beryllium, it has a wide range of applications in many fields. Beryllium is less dense than commonly used aluminum and titanium and four times stronger than steel. Beryllium has strong heat absorption capacity and stable mechanical properties, so it is an ideal metal material element in the aerospace field. [0003] We have proposed a beryllium ore leaching separation process (patent application number 202011120123.0). Under the action of ...

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Problems solved by technology

Patent CN107641712A discloses a very complicated method of extracting and preparing beryllium hydroxide from beryllium-containing ore. It needs to be roasted by adding quicklime, then leached with acid, then evaporated and concentrated, and then added to remove impurities, and then precipitated The method needs to go through many tedious operations, requires high investment in equipment, consumes a large amount of reagents, and the purity of the obtained beryllium hydroxide is limited.

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