A kind of preparation method of nano aluminum hydroxide in aluminum rock

Abstract

The invention discloses a preparation method of nano aluminum hydroxide in aluminous rock. The preparation method includes: grinding the aluminous rock to below 74 um; drying, and mixing with hydrochloric acid of certain concentration and nitric acid according to a certain proportion; disposing in a water-bath pot, mechanically stirring and leaching; controlling leaching time and temperature; cooling before filtering leachate, slowly adding obtained filtrate into a sodium hydrogen solution to adjust pH, and removing impurities; filtering step by step to obtain pure aluminum salt, feeding CO2 to obtain aluminum hydroxide precipitate, filtering, washing and drying to obtain a nano aluminum hydroxide product. The preparation method is high in preparation efficiency, thorough in leaching, high in yield, utilization rate and purity; through the preparation method, mixed liquid of hydrochloric acid and nitric acid is used to leach the aluminous rock, nano aluminum hydroxide powder high in quality can be obtained through processes of impurity removing, purifying and refining, high economic benefit can be acquired, and aluminous rock resources can be utilized comprehensively.

Description

technical field [0001] The invention belongs to the technical field of preparing nanometer aluminum hydroxide powder in aluminous rocks, and relates to a method for preparing nanometer aluminum hydroxide in aluminous rocks. Background technique [0002] Aluminous rocks are hydroxides containing aluminum. In my country, aluminous rocks mainly contain diaspore and clay minerals, and also contain siliceous and anatase. With the increasing scarcity of resources and the strengthening of people's awareness of environmental protection, the comprehensive utilization of alumina rock has attracted more and more attention. The main minerals in alumina rocks are diaspore and clay minerals, and the content of Al 2 o 3 , use aluminum rock and mixed acid leaching and then remove impurities to get nano aluminum hydroxide powder, the obtained nano aluminum hydroxide powder can be widely used in various flame retardants and inorganic fillers. [0003] At present, nano-aluminum hydroxide is...

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Problems solved by technology

[0003] At present, nano-aluminum hydroxide is mainly prepared by solid-phase method, gas-phase method and liquid-phase method, but the solid-phase method requires high temperature, so the equipment requirements are high, and the equipment purchase cost is expensive; the liquid-phase method is commonly used to prepare nano-hydroxide The method of aluminum powder, but the liquid phase method is easy to introduce new impurities, resulting in low purity of the prepared nano-aluminum hydroxide; and the gas phase method is difficult to collect and low yield when collecting

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