Method for preparing high-quality titanium white from titanium-containing solution

Abstract

The invention discloses a method for preparing high-quality titanium white from titanium-containing solution. The method comprises the following steps of: adding kali salt, zinc salt and aluminum salt into the titanium-containing solution to atomize the titanium-containing solution; adding the atomized titanium-containing solution into a reactor dropwise; introducing hot air into the reactor and hydrolyzing the titanium-containing solution at the temperature of between 150 and 350 DEG C so as to generate solid-phase hydrated titanium dioxide; and calcining the hydrated titanium dioxide at the temperature of between 300 and 1,000 DEG C for 1 to 5 hours so as to obtain the high-quality titanium white. In the method, continuous spray hydrolysis is used instead of the conventional intermittent liquid-phase hydrolysis, so that reaction speed is high, yield is high, problems encountered in the conventional titanium white producing process by a sulfuric acid method can be solved effectively, product quality is enhanced, damage to the environment is avoided and the production cost of the titanium white can be lowered simultaneously.

Description

technical field [0001] The invention relates to a production process of titanium dioxide, in particular to a method for preparing high-quality titanium dioxide by using a titanium-containing solution. Background technique [0002] At present, there are two main production methods of high-quality raw material grade titanium dioxide: chloride method and sulfuric acid method. [0003] The production process of chloride titanium dioxide has high requirements on raw materials, and ilmenite cannot be used directly for production. For vanadium-titanium magnetite with high calcium and magnesium content, it is also difficult to convert it into titanium raw materials suitable for the production process of chloride-based titanium dioxide through traditional raw material upgrading methods such as smelting. At the same time, the chlorination titanium dioxide production process has extremely high requirements on equipment, and the technical secrets of key equipment such as chlorination f...

AI Technical Summary

Problems solved by technology

[0004] Ferrous sulfate crystals and waste acid will be produced in the production process of titanium dioxide by sulfuric acid method. At present, there is no effective recycling method, and the treatment cost is high. The environmental protection problem cannot be completely solved. The product quality is low, and it belongs to the industry restricted by the state.

Especially in the sulfuric acid titanium dioxide production process, metatitanic acid is prepared by liquid-phase hydrolysis of titanyl sulfate solution. The operation mode is mainly intermittent operation. There are many influencing factors in the hydrolysis process, which makes it difficult to control the product quality. Different hydrolysis batches The quality of metatitanic acid obtained is unstable

Moreover, the metatitanic acid obtained by hydrolysis needs to be washed with a large amount of water, and a large amount of waste acid that cannot be effectively recycled is produced.