Alkali fusion method for continuously decomposing zircon sand

Abstract

The invention relates to an alkali fusion method for continuously decomposing zircon sand. The alkali fusion method comprises: respectively preparing zircon sand and an alkali according to a molar ratio of the zircon sand to the alkali of 1:4-1:7, respectively pre-heating the zircon sand and the solid alkali or liquid alkali to a certain temperature, completely dewatering the solid alkali or liquid alkali, continuously heating to achieve a liquid state, adding the heated zircon sand and the heated liquid alkali into a vertical reactor, uniformly mixing, carrying out a primary alkali fusion reaction to generate a solid state material, transferring the solid state material to a rotation cylinder reactor, further completing a deep alkali fusion reaction under a solidification state condition, slowly cooling to obtain an alkali fusion reaction product, and carrying out water washing on the alkali fusion reaction product to obtain sodium zirconate and Na2SiO3. According to the present invention, the continuous process for decomposing the zircon sand through the alkali fusion method is provided, such that the industrial continuous production is achieved, the production efficiency is improved, the zirconium oxychloride production cost is reduced, and the production environment is improved.

Description

technical field [0001] The invention relates to a method for decomposing zircon sand by alkali fusion, in particular to a method for continuously decomposing zircon sand by alkali fusion in the process of producing zirconium oxychloride by an acid-alkali method. Background technique [0002] As a scarce strategic resource, zirconium has excellent characteristics such as high melting point, corrosion resistance, plasticity and nuclear performance, and is widely used in military and civilian industries, among which nuclear grade zirconium is an important basic material in nuclear energy applications. Zircon sand is zircon (ZrSiO 4 ) mineral concentrate obtained through ore dressing, its theoretical composition is ZrO 2 Accounting for 67.21%, SiO 2 Accounted for 32.79%. Since zirconium and hafnium belong to the same subgroup and have similar chemical properties, zircon sand often contains a certain proportion of hafnium minerals. Due to zircon sand (ZrSiO 4 ) in [SiO 4 ] ...

AI Technical Summary

Problems solved by technology

[0012] In the current production process of producing zirconium oxychloride by alkali fusion method, alkali fusion decomposition is intermittent operation, which cannot form continuous production, which leads to problems such as low production efficiency, high production cost and high energy consumption. , during the sintering process, there will be problems of uneven heating of the sintering pot, resulting in unstable product quality

In addition, during the production process, there are certain production safety issues in the transportation of high-temperature sintering pots

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