Low-temperature reduction technology of ilmenite

Abstract

The invention provides a low-temperature reduction technology of ilmenite. The technology comprises the following steps: mixing ilmenite and pulverized coal based on the mass ratio of 5: 1-1.2 under normal temperature condition; conveying the material into a rotary kiln or a tunnel kiln after mixing; igniting the pulverized coal; heating until the temperature is 600-700 DEG C, and reacting for 0.5-1h; cooling until normal temperature is reached after reaction; treating the cooled material through an airflow classifier; and magnetically separating twice, namely, magnetically separating for thefirst time under 1000-2000Gs to obtain titanium-containing magnetite and tailings, and magnetically separating the tailings for the second time under 5000-8000Gs to obtain ilmenite concentrate. According to the technology, pulverized coal is treated as a reducing agent, and the rotary kiln or the tunnel kiln is provided, so that the solubility of the ilmenite can be obviously improved under intermediate and low temperature conditions, and meanwhile, the main TiO2 content can be increased, and the titanium-containing magnetite and quality ilmenite concentrate can be obtained; the production cost of titanium dioxide is decreased, and the quality of the titanium dioxide is increased.

Description

technical field [0001] The invention relates to the technical field of ilmenite, in particular to a low-temperature reduction process of ilmenite. Background technique [0002] Ilmenite is the main raw material for the manufacture of titanium dioxide and titanium alloys. At present, 7-7.5 million tons are consumed in my country every year, most of which come from seaside placer. Seashore placers have been scoured by air and water for a long time, and most of the FeO that makes up ilmenite molecules has been oxidized into Fe 2 o 3 However, because the oxidized ilmenite is difficult to dissolve, titanium dioxide enterprises have to increase the production cost a lot. Therefore, 2-3 million tons of ilmenite are backlogged in warehouses every year. At present, there is a treatment method in China called reducing titanium, which needs to be carried out at a high temperature of 1100°C, and the resulting product is easily re-oxidized by air. Not only is the cost very high, but al...

AI Technical Summary

Problems solved by technology

At present, there is a treatment method in China called reducing titanium, which needs to be carried out at a high temperature of 1100°C, and the resulting product is easily re-oxidized by the air. Not only is the cost very high, but also a large amount of metallic iron is produced, which makes the titanium dioxide industry unusable.