Production method of non-coating rutile type titanium dioxide

Abstract

The invention relates to the field of titanium dioxide preparation, in particular to a production method of non-coating rutile type titanium dioxide. The method includes the steps of (1), selecting ofraw materials; (2), preparation of a titanium solution; (3), preheating of the titanium solution; (4), manufacturing of seed crystals; (5), adding of the seed crystals; (6), hydrolyzing; (7), flushing; (8), washing; (9), calcining. The acid-split titanium solution can be hydrolyzed without being concentrated, the energy consumption is low, a crystal form accelerant is added when the seed crystalsare prepared, the titanium dioxide can be converted into rutile in the production process, a high crystal form conversion accelerating effect is achieved, the calcining temperature is low, and damageto equipment is greatly relieved; by means of the two links that the crystal form accelerant is added when the seed crystals are prepared, and heat preservation is carried out for 3 hours after calcining is completed, it can be promoted that the produced titanium dioxide is converted into the rutile, the conversion rate of the rutile is high, and therefore the non-coating rutile type titanium dioxide with high rutile content is obtained.

Description

Technical field [0001] The invention relates to the field of titanium dioxide preparation, in particular to the production of rutile titanium dioxide for non-coating [0002] method. Background technique [0003] Titanium dioxide (English name: titanium dioxide) is a white pigment whose main component is titanium dioxide (TiO2). Titanium dioxide is considered to be the best white pigment in the world. It is widely used in coatings, plastics, papermaking, printing inks, Chemical fiber, rubber, cosmetics and other industries. Titanium dioxide has three crystalline forms in nature: rutile, anatase and brookite. Rutile is the most stable crystalline form of titanium dioxide. It has a compact structure and higher hardness, density, dielectric constant and Refractive index, with higher hiding power, anti-glare and anti-chalking properties, not only has stable physical and chemical properties, but also has excellent optical and electrical properties and excellent pigment performance. Ru...

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Problems solved by technology

Dilute titanium liquid TiO after separation of ferrous iron by freezing and crystallization in sulfuric acid process 2 The concentration is generally about 150g / L. In order to prepare qualified pigment-grade titanium dioxide, the dilute titanium solution must be concentrated in vacuum until it is concentrated to TiO2. 2 200±5g / L (for pressurized hydrolysis) or TiO 2 215~230g / L (for normal pressure hydrolysis), resulting in complex process; in addition, when producing rutile titanium dioxide, it is necessary to add a large amount of rutile calcined seeds, and to carry out long-term high-temperature calcination (>950 ° C), which consumes a lot of energy and is harmful to The damage to the equipment is large, and the rutile conversion rate of the seed crystal is low, and the quality of the initial rutile is not high

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