Gas-liquid separation recycling technology of waste acid in production of titanium dioxide powder by sulfuric acid process

Abstract

The invention relates to a gas-liquid separation recycling technology of waste acid in production of titanium dioxide powder by sulfuric acid process, and belongs to the field of comprehensive utilization of three wastes, which aims at solving the technical problem of providing the recycling method of waste slag and waste sulfuric acid in production technology of the titanium dioxide powder by thesulfuric acid process. The invention provides the recycling method of the waste slag and waste sulfuric acid in the production technology of the titanium dioxide powder by the sulfuric acid process.

Description

technical field [0001] The invention relates to a gas-liquid separation and recovery process of waste acid in the production of sulfuric acid titanium dioxide, which belongs to the field of comprehensive utilization of three wastes. Background technique [0002] Titanium dioxide material is a white inorganic pigment, which mainly has two crystal forms: anatase and rutile. Due to its superior density, dielectric constant and refractive index, it is considered to be the best white pigment in the world at present, and is widely used in industries such as coatings, plastics, papermaking, printing ink, chemical fiber and rubber. With the continuous development of the economy, the demand for titanium dioxide continues to increase. Since 2000, my country has completed the localization of large-scale titanium dioxide devices and equipment in China, and the titanium dioxide industry is developing rapidly towards large-scale and large-scale production. The output of titanium dioxide...

AI Technical Summary

Problems solved by technology

Although this method can reduce waste acid pollution, it also brings the following problems: (1) because the neutralization slag mainly contains CaSO 4 , Fe(OH) 3 , Mg(OH) 2 Wait, at present, we can only discard the pile for processing

After being washed by rainwater, it seeps into the land and farmland, pollutes groundwater resources and surface vegetation, and causes serious irreversible secondary pollution to the ecological environment

(2) Equipment investment and operating costs are high, which can only be passed on to consumers by increasing product prices in the end, thereby affecting the competitiveness of enterprises; the resulting secondary pollution will inevitably cause bitter results that go against the original intention and threaten the company's reputation Survive

(3) The sulfur resources in the waste acid are not utilized, so that the sulfur is harmful to the environment in the form of waste residue

[0018] For the patent application for the three waste recycling method of sulfuric acid production of titanium dioxide with the application publication number CN102431975A, it directly adds the titanium dioxide waste slag green vitriol into a rotary kiln or a continuous frying pan reactor for reduction and decomposition to generate alumina slag and sulfur dioxide Gas, although the effect of recovering sulfur and aluminum resources in titanium dioxide waste slag has also been achieved, the purity of aluminum oxide obtained by reduction and decomposition is relatively low