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A kind of production method of non-coating rutile titanium dioxide

A technology of rutile-type titanium dioxide and production methods, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of low quality of primary rutile products, low rutile conversion rate of seed crystals, complicated process, etc., and achieve transformation High efficiency, low calcination temperature and simple process

Active Publication Date: 2021-08-31
ALFA FULL GUANGXI TENG COUNTY TITANIUM DIOXIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A kind of production method of non-coating rutile titanium dioxide
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  • A kind of production method of non-coating rutile titanium dioxide

Examples

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Effect test

Embodiment 1

[0031]A kind of production method of non-coating rutile type titanium dioxide, comprises the following steps:

[0032] (1) Selection of raw materials: control of P in titanium ore 2 0 5 The mass percentage is less than 0.05%;

[0033] (2) Preparation of titanium liquid: add sulfuric acid to titanium ore according to the conventional process, and obtain titanium liquid after acidolysis, sedimentation, freezing, crystallization and separation of ferrous iron. The titanium liquid is not concentrated, and the obtained titanium liquid is Related indicators are as follows: TiO 2 Concentration: 140±10g / L, F value: 1.85~2.05; Iron-to-titanium ratio: 0.30~0.45; Clarity: first-grade sedimentation; Trivalent titanium content: 0.5~1.5g / L; Stability: ≥300;

[0034] (3) Titanium liquid preheating: The titanium liquid prepared and measured according to the process index is poured into the hydrolysis preheating pot, and steam is introduced for heating; at the same time, 2.2% of the volume ...

Embodiment 2

[0042] A kind of production method of non-coating rutile type titanium dioxide, comprises the following steps:

[0043] (1) Selection of raw materials: control of P in titanium ore 2 0 5 The mass percentage is less than 0.05%;

[0044] (2) Preparation of titanium liquid: add sulfuric acid to titanium ore according to the conventional process, and obtain titanium liquid after acidolysis, sedimentation, freezing, crystallization and separation of ferrous iron. The titanium liquid is not concentrated, and the obtained titanium liquid is Related indicators are as follows: TiO 2 Concentration: 140±10g / L, F value: 1.85~2.05; Iron-to-titanium ratio: 0.30~0.45; Clarity: first-grade sedimentation; Trivalent titanium content: 0.5~1.5g / L; Stability: ≥300;

[0045] (3) Titanium liquid preheating: The titanium liquid prepared and measured according to the process index is poured into the hydrolysis preheating pot, and steam is introduced for heating; at the same time, 2.2% of the volume...

Embodiment 3

[0053] A kind of production method of non-coating rutile type titanium dioxide, comprises the following steps:

[0054] (1) Selection of raw materials: control of P in titanium ore 2 0 5 The mass percentage is less than 0.05%;

[0055] (2) Preparation of titanium liquid: add sulfuric acid to titanium ore according to the conventional process, and obtain titanium liquid after acidolysis, sedimentation, freezing, crystallization and separation of ferrous iron. The titanium liquid is not concentrated, and the obtained titanium liquid is Related indicators are as follows: TiO 2 Concentration: 140±10g / L, F value: 1.85~2.05; Iron-to-titanium ratio: 0.30~0.45; Clarity: first-grade sedimentation; Trivalent titanium content: 0.5~1.5g / L; Stability: ≥300;

[0056] (3) Titanium liquid preheating: The titanium liquid prepared and measured according to the process index is poured into the hydrolysis preheating pot, and steam is introduced for heating; at the same time, 2.2% of the volume...

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Abstract

The present invention relates to the field of titanium dioxide preparation, in particular to a production method of non-coating rutile titanium dioxide, the method comprising (1) selecting raw materials (2) preparing titanium liquid (3) preheating titanium liquid (4) making crystal Seeding (5) adding seed crystals (6) hydrolysis (7) rinsing (8) washing (9) calcination and other steps, the titanium liquid after acid hydrolysis in the present invention can be hydrolyzed without concentration, and the energy consumption is low. Adding a crystal form accelerator when preparing the seed crystal can promote the conversion of titanium dioxide to rutile during the production process, which has a strong role in promoting the crystal form conversion, and the calcination temperature is low, which greatly reduces the damage to the equipment. Adding a crystal accelerator when seeding the crystal and keeping it warm for 3 hours after calcination can promote the conversion of the produced titanium dioxide to rutile, and the rutile conversion rate is high, so as to obtain non-coating rutile titanium dioxide with high rutile content .

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
CPCC01G23/053C01P2006/60C01P2006/80
Inventor 容小邕
Owner ALFA FULL GUANGXI TENG COUNTY TITANIUM DIOXIDE
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