Method for preparing high-grade synthetic rutile

Abstract

The invention relates to a method for preparing high-grade synthetic rutile; the method comprises the following steps: electro-titanium slag and an alkaline solution are mixed by weight mixture ratio of liquid to solid of 1:1 to 15 for alkali leaching impurity removal reaction; after being reacted for 0.5 to 24 hours, the mixture is filtered and scrubbed to obtain alkali leached slag; modified slag is obtained after pre-oxidation and activated modification are successively carried out on alkali leached slag; the modified slag and the acid solution are mixed by weight mixture ratio of liquid to solid of 1:1 to 15 for acid leaching impurity removal reaction; after the mixture is reacted for 1 to 24 hours, acid leached slag is obtained; the synthetic rutile with the purity of greater than 93% is obtained after the acid leached residue is dried; the method meets the requirement that a chlorination process is used for titanium dioxide production, and has wide applicability to raw materials; the manufactured rutile has excellent physical and chemical properties, high purities and uniform grain fineness distribution; the recovery rate of titanium in the whole process is higher; the needed device has few investment, low energy consumption and has little impact on environment and low cost; leaching solutions generated after each-section reaction is recovered and processed for cyclic utilization.

Description

technical field

[0001] The invention relates to a method for preparing high-grade artificial rutile, in particular to a method for preparing artificial rutile with a purity exceeding 93% by using electric furnace titanium slag as a raw material. Background technique

[0002] Titanium dioxide is an important chemical raw material, and it is a white pigment with superior performance, which is widely used in coatings, plastics, paper and other industries. The current titanium dioxide production technology is mainly divided into sulfuric acid method and chlorination method. The sulfuric acid method uses titanium concentrate or acid-soluble titanium slag as raw material to produce rutile and anatase titanium dioxide. The waste water, waste acid and waste residue produced by it are With by-products such as ferrous sulfate, the environmental pollution is more serious; the chlorination method uses TiO 2 High-titanium slag or artificial rutile with a content of more than 90% is used...

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