Method for preparing submicron-sized particulate aluminium dihydrogen phosphate powder by aluminous rocks

Abstract

The invention discloses a method for preparing submicron-sized particulate aluminium dihydrogen phosphate powder by aluminous rocks. The method comprises the following steps: S1, crushing and grinding the aluminous rocks to be mineral powder, and drying; S2, placing mixed solution of a hydrochloric acid and a phosphoric acid and the dried mineral powder in a water bath kettle according to a proportion, stirring and leaching; S3, filtering obtained leachate, washing, adding ammonia water to filtrate and stirring, regulating a pH value and removing impurities, filtering and washing; S4, adding the ammonia water and a sodium hexametaphosphate dispersing agent to the filtrate obtained by removing the impurities, stirring to obtain aluminium dihydrogen phosphate hydrate precipitate; and S5, filtering and washing the obtained precipitate, drying and dehydrating to obtain a submicron-sized particulate aluminium dihydrogen phosphate powder product. The aluminous rocks are leached by using the mixed solution of the hydrochloric acid and the phosphoric acid according to the method, the submicron-sized particulate powder with good quality can be obtained through the working procedures of impurity-removing, cleaning and purifying and so on. The better economic benefit can be obtained, and the aluminous rock resource is comprehensively used.

Description

technical field [0001] The invention belongs to the technical field of preparing ultrafine aluminum dihydrogen phosphate powder in aluminous rock, and relates to a method for preparing ultrafine aluminum dihydrogen phosphate powder in aluminous rock. Background technique [0002] Aluminous rock is a solid waste that is discarded during the mining process of bauxite because the A12O3 content does not reach the grade for industrial utilization. The main minerals are symbiotic diaspore and clay minerals, and also contain siliceous and anatase. Due to the relatively low viscosity of alumina rock, it will turn into thin mud when it meets water, which not only causes waste of resources, but also destroys and pollutes the environment, which not only increases mining costs, but also makes bauxite underutilized. Therefore, it is the most urgent need to study the utilization of alumina rocks, so that the mines can be comprehensively developed and utilized, and the pollution of the oc...

AI Technical Summary

Problems solved by technology

2) Phosphoric acid reacts with alumina, but the reaction between phosphoric acid and alumina is relatively slow, so that the partial polymerization of phosphoric acid affects the progress of the positive reaction

3) Phosphoric acid reacts with metal aluminum, but the reaction is slow and requires a higher temperature

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