Method for preparing rutile titanium dioxide from new process titanium slag

Abstract

The invention discloses a method for preparing titanium dioxide from new process titanium slag, and belongs to the technical field of titanium dioxide production. The method comprises the following steps of: performing acidolysis reaction on the new process titanium slag and concentrated sulfuric acid under certain conditions; leaching, precipitating and filtering the mixture to obtain clear titanium liquid; adding an aluminum removing agent into the clear titanium liquid to recover aluminum by freezing crystallization; adding oxidized trivalent titanium serving as an oxidant into the clear titanium liquid and concentrating the mixture; hydrolyzing, filtering and washing the concentrate by using a process for adding crystal seeds; and bleaching, salting, calcining and post-processing the filter cake to prepare the rutile titanium dioxide which meets the application requirement. The method has the most noticeable characteristic that the rutile titanium dioxide which meets the application requirement is prepared from the new process titanium slag which has the disadvantages of various impurities and difficult acidolysis; and thus a new raw material for producing the titanium dioxideby a sulfuric acid method is developed, various valuable elements are recovered as much as possible, the utilization ratio of the resource is improved and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing titanium dioxide, in particular to a method for preparing rutile titanium dioxide by utilizing a new process titanium slag, and belongs to the technical field of titanium dioxide production. Background technique [0002] Titanium dioxide scientific name titanium dioxide (TiO 2 ), is an important white pigment and porcelain glaze, widely used in metallurgy, coatings, plastics, papermaking, inks, synthetic fibers, rubber, welding electrodes, capacitors, electric porcelain, cosmetics, correction fluids, etc. There are two kinds of titanium dioxide products: rutile type (Rtile R type) and anatase type (Anatase A type). High hiding power and decolorizing power; anatase type has low relative density and poor light fastness. [0003] The production methods of titanium dioxide mainly include sulfuric acid method and chlorination method. Among them, the sulfuric acid method can be used to produce anatase and ru...

AI Technical Summary

Problems solved by technology

However, directly using the new process titanium slag as raw material to prepare titanium dioxide, and using the usual titanium dioxide process for production, it is difficult to complete acidolysis due to the special crystal structure, and the acidolysis rate is low, while the titanium solution obtained by acidolysis is due to impurities in it. The content is high, often produces jelly, which makes the production process difficult to continue, and the quality of the produced titanium dioxide is limited, and can only be used as low-quality titanium dioxide. For example, in 1989, the Beijing Nonferrous Research Institute produced anatase titanium in the laboratory. White powder, while the industry can only get non-pigment titanium dioxide as welding rod

So far, no report has been found on the preparation of high-quality rutile titanium dioxide using the new process titanium slag

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