High-titanium slag selective leaching and quality improvement method

Abstract

The invention provides a high-titanium slag selective leaching and quality improvement method. The method comprises the following steps of (1) crushing high-titanium slag and feeding the crushed high-titanium slag and a sodium hydroxide solution into a high-pressure kettle; (2) introducing oxygen into the high-pressure kettle, conducting heating, stirring and heat preservation and completing alkaline leaching; (3) filtering and separating the material subjected to alkaline leaching and conducting water washing on an alkaline leaching product to obtain an alkaline leaching slag material; (4) feeding the alkaline leaching slag material and hydrochloric acid into the high-pressure kettle, adding crystal seeds, conducting heating, stirring and heat preservation and completing acid leaching; and (5) filtering and separating the material subjected to acid leaching, and conducting water washing and drying on an acid leaching product to obtain high-purity titanium dioxide. Through the method,cyclic utilization of resources can be achieved, no industrial wastewater and waste residues are produced, and green production is achieved.

Description

technical field

[0001] The invention relates to the technical field of metallurgy, in particular to a method for selectively leaching and upgrading high-titanium slag. Background technique

[0002] Most of the ilmenite in China is used as the raw material for the production of titanium dioxide by the sulfuric acid method, and only a small part is processed into titanium-rich materials; the high-titanium slag is used as the raw material for the production of titanium dioxide, titanium tetrachloride and sponge titanium by the chlorination method. The wide application of titanium, titanium-based alloys and titanium dioxide chloride has led to an increasing domestic demand for high-quality titanium slag, that is, titanium-rich materials; due to the fact that the grade of titanium ore in China is generally not high, and the content and types of impurities in it are relatively high. It is more difficult to purify, and industrial production has not been realized in China; the grade...