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A kind of low-concentration hydrolysis method in titanium dioxide process of sulfuric acid method

A low-concentration, titanium dioxide technology, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., to achieve good pigment and optical properties, reduce concentration costs, and reduce the average concentration

Active Publication Date: 2017-11-14
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only reduce the concentration of titanium solution to 190g / L at the lowest.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Join 10.6m 3 Preheat to 98°C bottom water to the hydrolysis pot, then add 98°C 5.4m 3 Titanium solution with a concentration of 240g / L, and then add 49m 3 For the titanium solution with a concentration of 199g / L, the two titanium solutions were added within 25 minutes, and then operated according to the conventional hydrolysis to obtain the hydrolyzed material. The hydrolyzed material was subjected to suction filtration washing, Ti 3+ Reduction bleaching, addition of calcined seed crystals, secondary suction filtration and washing, addition of K, P, and Al salt treatment agents, programmed temperature rise muffle furnace calcination, crushing machine grinding, inorganic coating and other post-treatments to obtain the product.

[0026] In the present embodiment 1-7, the suction filtration and washing are laboratory vacuum suction filtration and washing, and the vacuum degree is 0.1MPa, Ti 3+ Reduction bleaching is all according to the conventional process in this fiel...

Embodiment 2

[0028] Join 15.4m 3 Preheat the bottom water to 98°C to the hydrolysis pot, then add 44.6m water preheated to 96°C 3 Titanium solution with a concentration of 240g / L, then add 5m 3 For the titanium liquid with a concentration of 199g / L, the titanium liquid was added within 15 minutes, and then operated according to the conventional hydrolysis to obtain the hydrolyzed material. The hydrolyzed material was subjected to suction filtration washing, Ti 3+ Reduction bleaching, addition of calcined seed crystals, secondary suction filtration and washing, addition of K, P, and Al salt treatment agents, programmed temperature rise muffle furnace calcination, crushing machine grinding, inorganic coating and other post-treatments to obtain the product.

Embodiment 3

[0030] Join 4.7m 3 Preheat to 98°C bottom water to the hydrolysis pot, then add 6m water preheated to 98°C 3 Titanium solution with a concentration of 240g / L, then add 54.3m 3 For the titanium solution with a concentration of 165g / L, the sulfur-titanium solution was added within 22 minutes, followed by conventional hydrolysis to obtain the hydrolyzed material. The hydrolyzed material was subjected to suction filtration washing, Ti 3+ Reduction bleaching, addition of calcined seed crystals, secondary suction filtration and washing, addition of K, P, and Al salt treatment agents, programmed temperature rise muffle furnace calcination, crushing machine grinding, inorganic coating and other post-treatments to obtain the product.

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Abstract

The invention discloses a low concentration hydrolysis method in the sulfuric acid method titanium dioxide technology and belongs to the field of titanium dioxide production. The method comprises the following steps: (1) water is added to a hydrolysis pot as base water after preheated; (2) 200-240 g / L of high concentration titanium solution A and 160-199 g / L of low concentration titanium solution B are added successively to the hydrolysis pot continuously within 15-25 minutes, and the volume ratio of the high concentration titanium solution A and and the low concentration titanium solution B is (1:9)-(20:1); (3) following operation is performed with the conventional hydrolysis method. The hydrolysis method is efficient, low in consumption and high in quality, titanium dioxide with well distributed particle shapes and particle sizes and excellent covering performance and other pigment and optical performance can be prepared, the concentration of the titanium solution can be reduced, the amount of the base water is reduced, condensed steam is saved, the washing effect and the product quality are improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for hydrolyzing self-generated seed crystals in the production process of sulfuric acid titanium dioxide, belonging to the field of titanium dioxide production. Background technique [0002] Titanium dioxide is widely used in many fields, such as coatings, inks, plastics, rubber, paper, ceramics and synthetic fibers, for its non-toxicity, best opacity, best whiteness and brightness, and good hiding power and coloring power. industry. At present, my country's titanium dioxide is mainly produced by the sulfuric acid method. The hydrolysis process is one of the core processes of sulfuric acid titanium dioxide. The hydrolysis process is the process of hydrolyzing titanyl sulfate solution to produce hydrated titanium dioxide. The pros and cons of hydrolysis not only affect the economics of industrial production, but also have a great relationship with the quality of the final product. There are many patents and reports o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
CPCC01G23/0532C01P2006/60
Inventor 曹鹏姚恒平朱全方周春勇常键
Owner SICHUAN LOMON TITANIUM IND CO LTD
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