Method for recycling unmelted zircon sand in the process of preparing zirconium oxychloride by alkali fusion method

Abstract

The invention relates to a recycling method of unfused zircon sand in a technical process for preparing zirconium oxychloride by an alkaline fusion method, and belongs to the field of preparation methods of zirconium compounds. The technical process for preparing zirconium oxychloride by the alkaline fusion method comprises the following steps of alkaline fusion, water washing, transformation, acidification, crystallization, acid pickling, centrifugation and drying. The recycling method is characterized in that a working procedure of recycling unfused zircon sand is added after the steps of water washing and transformation and before the step of acidification so as to precipitate and separate the unfused zircon from a dilute hydrochloric acid solution of a water transformation material. The working procedure of recycling unfused zircon sand comprises the following steps: (1) dissolving the water transformation material by a diluted hydrochloric acid; (2) leaving the obtained solution to stand for precipitation; (3) performing solid-liquid separation; (4) repetitively washing unfused sand collected in the step (3) with clean water until the washing water is clear; (5) drying the washed unfused sand in the step (3), and supplying the dried unfused sand for alkaline fusion. Through the adoption of the recycling method disclosed by the invention, the recycling rate of the unfused zircon sand reaches 97%, and the recycled zircon sand can be recycled as raw zircon sand, so that the productive rate of zirconium oxychloride products is increased, and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for recycling unmelted zircon sand in the process of preparing zirconium oxychloride by an alkali fusion method. A method for the preparation of compounds belonging to zirconium. Background technique [0002] Zirconium was first discovered in zircon (Zircon) by German chemist Martin Heinrich Kaproth in 1789, and prepared zirconium dioxide. [0003] Zircon is the main zirconium industrial mineral. Among zirconium minerals, zircon minerals have the widest distribution, the most types and the largest reserves. At present, seaside placer is the main source of zircon products. According to the statistical data in 2005, ZrO 2 According to statistics, the total reserves of zircon sand in the world are about 38 million tons, and the reserves of zirconium in China are about 500,000 tons. [0004] Zircon sand is zircon (ZrSiO) obtained by processing and beneficiating zircon minerals. 4 ) concentrate, its theoretical composi...

AI Technical Summary

Problems solved by technology

Waste of resources and environmental pollution still exist

[0017] 2. Due to the loss of unmelted zircon sand with waste silicon slag, the yield of zirconium oxychloride products is reduced, the production cost is increased, and the economic benefits of enterprises are not good, which seriously hinders the development of zirconium oxychloride industry

[0018] 3. In the process of preparing zirconium oxychloride by alkali fusion method, the recycling method involving unmelted zircon sand with high recycling rate has not been seen yet.

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