A method for efficient extraction of valuable component titanium from titanium-containing blast furnace slag

Abstract

The invention provides an extraction method of titanium in titanium-containing blast furnace slag. The specific process steps are as follows: crushing titanium-containing blast furnace slag into 106 microns and less, and burdening slag, reducing agent metal powder and auxiliary matter salt according to a certain mass ratio; uniformly mixing materials and reacting in a specific atmosphere, washingto remove salt, and dissolving the titanium through the weak acid, thereby obtaining the acidic solution containing low-valent titanium; oxidizing, hydrolyzing, washing and calcining the titanium-containing acidic solution to acquire titanium dioxide, performing pyrohydrolysis on the hydrolyzed solution through the spray to acquire oxide residue and hydrochloric acid solution, returning the regenerated hydrochloric acid solution to the process of dissolving the titanium. One of the important key point of the invention is to realize the modification on the titanium-containing blast furnace slagthrough the metal thermal recovery process, the acid soluble performance in the weak acid medium is greatly improved, and the titanium can be selectively extracted from the acidic solution through ahydrolysis process.

Description

technical field [0001] The invention belongs to the field of chemical metallurgy and relates to a method for efficiently extracting titanium, a valuable component in titanium-containing blast furnace slag. Background technique [0002] my country is rich in titanium resources, with TiO 2 Totaling 965 million tons, accounting for 38.85% of the world's total reserves, ranking first in the world, of which 90.5% are distributed in the Panzhihua-Xichang area, which is a major national characteristic metal resource. Titanium mainly exists in the form of ilmenite. After beneficiation, about 54% of titanium enters titanium concentrate and becomes the raw material for blast furnace ironmaking; after blast furnace smelting and recovery of Fe and V resources, most of titanium is TiO 2 into blast furnace slag in the form of TiO 2 The content is about 25%, and it coexists with silicon oxide, magnesium oxide, aluminum oxide, etc. TiO in blast furnace slag 2 The content is low, and the...

AI Technical Summary

Problems solved by technology

TiO in blast furnace slag 2 Low content, complex mineral phase structure, difficult to be used as raw material for titanium extraction

At present, only Panzhihua Iron and Steel Co., Ltd. discharges 3000Kt of titanium-containing blast furnace slag every year, and most of them are disposed of as waste stockpiles, which not only causes environmental pollution, but also causes waste of resources.

[0003] For the recovery of titanium resources in titanium-containing blast furnace slag, researchers have carried out a lot of work, mainly forming the following treatment methods: (1) acid extraction of TiO 2 , including sulfuric acid method and hydrochloric acid method, due to the stable phase structure of titanium-containing blast furnace slag, it needs to be decomposed with high acid, and the reaction is not complete, TiO 2 The extraction cost is high; (2) Alkaline extraction of TiO 2 , that is, NaOH or Na 2 CO 3 Isoalkali roasting treatment of titanium-containing blast furnace slag can promote the structural transformation of titanium and strengthen the acid decomposition performance, but the alkali medium circulation cost of this method is high, and the equipment corrosion is serious; (3) it is used to prepare building materials, but due to the titanium-containing blast furnace slag Strong crystallization performance makes the activity of cement poor; (4) Preparation of ferro-titanium and silicon-titanium alloys, but the demand for these alloys is low, which seriously does not match the production of blast furnace slag, and the application of this method is limited

Visible, adopt existing technology to handle titanium-containing blast furnace slag, can appear to be outweighed.

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