Method for preparing silicon dioxide and zirconium oxychloride through comprehensive utilization of reaction byproducts

Abstract

The invention provides a method for preparing silicon dioxide and zirconium oxychloride through comprehensive utilization of reaction byproducts. The silicon dioxide is prepared by a gas phase process, and the raw materials include hydrogen, silicon tetrachloride and / or methyl trichlorosilane; the zirconium oxychloride is prepared by a boiling chlorination process, and the raw materials include chlorine, zircon sand, petroleum coke, metal silicon and / or silicon carbide; the silicon tetrachloride is a byproduct of preparing the zirconium oxychloride; the hydrogen is generated by an electrolytic reaction of hydrochloric acid; the hydrogen is generated by a reaction of separating carbon monoxide and water vapor from the tail gas of preparing zirconium oxychloride. The chlorine for the reaction of preparing zirconium oxychloride is mainly generated by the electrolytic reaction of hydrochloric acid, and the insufficient part is supplied externally. According to the method provided by the invention, by combining three production processes, the problems in byproduct treatment and raw material resource as well as in the utilization of waste heat energy are solved; the added value of the product is raised; the transport and storage cost of the material and the environmental treatment cost are reduced; and clean production with low cost and low energy consumption is realized.

Description

technical field [0001] The invention relates to the technical field of silicon dioxide preparation, in particular to a method for comprehensively utilizing reaction by-products to prepare silicon dioxide and zirconium oxychloride. Background technique [0002] The main raw materials that need to be used in the production process of fumed silica are silicon tetrachloride or methyltrichlorosilane, hydrogen, and a large amount of water is needed to absorb the by-product hydrogen chloride tail gas. At present, most fumed silica production enterprises use silicon tetrachloride by-product of polysilicon production enterprises or methyltrichlorosilane by-product of organosilicon production enterprises, methanol hydrogen production or hydrogen by-product of chlor-alkali plant and tap water as raw materials. The hydrogen chloride produced is absorbed by water and made into hydrochloric acid for sale or sent to polysilicon or organic silicon production enterprises as raw materials. T...

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Problems solved by technology

[0005] The first object of the present invention is to provide a method for comprehensively utilizing reaction by-products to prepare silicon dioxide and zirconium oxychloride, to solve the problems of economic losses and environmental pollution caused by non-recyclable by-products in the prior art, as well as raw materials and by-products The problem of high cost in the transportation process, the method for preparing silicon dioxide and zirconium oxychloride by comprehensively utilizing the reaction by-products, comprehensively utilizes the by-products of the zirconium oxychloride reaction by the boiling chlorination method and the hydrochloric acid electrolysis reaction Products and waste water, as well as by-products and waste heat in the process of preparing silica, have the advantages of increasing product added value, reducing material transportation and storage costs, reducing environmental protection treatment costs, and achieving low-cost, low-consumption clean production, etc.

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