Method for preparing titanium-rich material by melting treatment of titanium-containing blast furnace slag with boric acid

Abstract

The invention belongs to the field of metallurgy, and particularly relates to a method for preparing a titanium-rich material from titanium-containing blast furnace slags by virtue of fusion treatment of boric acid. A technical problem to be solved by the invention is to provide a simple, environment-friendly and low-power consumption method for preparing the titanium-rich material from the titanium-containing blast furnace slags as well as the titanium-rich material prepared by the method. For solving the technical problem, a technical scheme adopted by the method comprises the following steps: batching ball-milled blast furnace slags with boric acid, heating to perform a fusion reaction, cooling, crushing, leaching by use of hydrochloric acid, filtering and separating. The titanium-rich material prepared by the preparation method disclosed by the invention contains not less than 60% by mass of TiO2. The preparation method disclosed by the invention has the advantages that the technological process is simple, and high-temperature and high-pressure reactions are not needed; the power consumption is low; the acid used in leaching is low in concentration and low in usage amount, so the process is more environmental friendly; a mixture formed after the crushing is washed with hot water, the hot water after washing is concentrated and crystallized, and boric acid is recycled, so the cost is low.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for preparing titanium-rich material by melting treatment of titanium-containing blast furnace slag with boric acid. Background technique [0002] Blast furnace slag is a kind of waste slag discharged from the blast furnace for smelting pig iron, and its composition is different due to different mineral components in different places. Panxi area is rich in vanadium-titanium magnetite, so its blast furnace slag contains about 23-25% TiO2 blast furnace slag. If the blast furnace slag as a secondary resource is not well utilized, it will not only waste the secondary resource but also cause great pollution to the environment, especially the titanium-containing blast furnace slag. Panzhihua Iron and Steel's blast furnace slag contains TiO 2 The high quantity restricts its development and utilization in many aspects. Panzhihua Iron and Steel emits 2-3 million tons of t...

AI Technical Summary

Problems solved by technology

[0004] (1) Technology of sulfuric acid leaching blast furnace slag to produce titanium dioxide and extract scandium (Chen Qifu, Zhang Yanqiu, Fang Minxian. Research on Panzhihua Iron and Steel Blast Furnace Slag Extraction of Titanium Dioxide and Scandium Trioxide [J]. Iron and Steel Vanadium Titanium, 1991, 12(3) :30-35.), but a certain amount of waste acid inevitably remains in the tailings after titanium extraction by this process, causing secondary pollution

This method consumes a lot of acid, and the production cost is high, causing great pollution to the environment.

[0005] (2) Titanium extraction technology by alkali treatment phase separation (Zhou Zhiming, Zhang Binghuai, Zhu Zizong. Slag and titanium separation test of high titanium type blast furnace slag [J]. Iron and Steel Vanadium Titanium, 1999, 20 (4): 36-38.), the The process consumes a lot of alkali, and the process of recovering sodium salt is complicated and the cost is greatly increased. The enrichment effect of titanium is not ideal. At the same time, alkaline treatment of blast furnace slag at high temperature will cause serious air pollution.

[0006] (3) High temperature carbonization and low temperature chlorination to produce TiCl 4 (Huang Jiaxu, Yang Yangjun, Lu Pingping. Steel, Vanadium and Titanium, 2011, V(32): 12-15), this process is still in the small-scale experimental stage and has not yet been industrialized, mainly because of the following technical bottlenecks: 1. Carbonization process It is not perfect yet, for example, there are problems such as large loss of carbon powder, broken electrodes, and long carbonization time; Second, the research on the chlorination process of carbonized slag is not comprehensive and systematic, such as the problem of low selectivity in low-temperature chlorination, and the overall chlorination equipment The level is not high; 3. How to derive the heat of reaction on large-scale chlorination equipment and how to avoid local overheating and other heat balance issues; 4. The use of chlorination residues has not been solved. "residue mountain", and the relatively stable gravel turns into powder, which increases the harm to the environment

However, due to the different sizes of perovskite grains and the symbiosis of perovskite and spinel, the disintegration effect of the monomer is poor, and the separation is difficult; and the direct use value of perovskite titanium-rich materials is low, and calcium oxide needs to be further removed Other impurities