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Method for preparing ceramic pigment titanium dioxide

A ceramic pigment and titanium dioxide technology, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problem of inability to remove various impurities, and achieve uniform and controllable particle size, high purity, and good color development effect. Effect

Active Publication Date: 2016-12-07
GUANGXI JINMAO TITANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common defect of these technologies is that it is impossible to remove various impurities produced in each step of the titanium dioxide preparation process, thereby improving the pigment performance of titanium dioxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The invention discloses a method for preparing ceramic pigment titanium dioxide, which comprises acid hydrolysis of ilmenite, purification, hydrolysis of titanyl sulfate, and calcination in a rotary kiln. Among them, the key improvements are in uniform stirring and purification, titanyl sulfate hydrolysis process, and the rest adopt the existing technology, which will not be repeated here.

[0035] Described purification process comprises the steps:

[0036] In the first step, adding a polyacrylamide anionic surfactant with a number average molecular weight of 15 million to the acid hydrolysis suspension, the concentration of the polyacrylamide is 0.08%, and the addition is 4% by volume of the suspension, using compressed air Add while stirring, control the flow rate to ensure that the addition time is within 10-15 minutes;

[0037] In the second step, adding a polyacrylamide cationic surfactant with a number average molecular weight of 15 million, the polyacrylamide c...

Embodiment 2

[0047] A kind of method for preparing ceramic pigment titanium dioxide of the present embodiment, its purification and titanyl sulfate hydrolysis process are as follows:

[0048] Described purification process comprises the steps:

[0049] In the first step, adding a polyacrylamide anionic surfactant with a number average molecular weight of 20 million to the acid hydrolysis suspension, the concentration of the polyacrylamide is 0.1%, and the addition amount is 3% by volume of the suspension, using compressed air Add while stirring, control the flow rate to ensure that the addition time is within 10-15 minutes;

[0050] In the second step, adding a polyacrylamide cationic surfactant with a number average molecular weight of 15 million, the polyacrylamide concentration is 0.1%, and the addition amount is 3% based on the volume of the suspension, added while stirring with compressed air, and controlled The flow rate is to ensure that the addition time is within 10-15 minutes; t...

Embodiment 3

[0060] A kind of method for preparing ceramic pigment titanium dioxide of the present embodiment, its purification and titanyl sulfate hydrolysis process are as follows:

[0061] Described purification process comprises the steps:

[0062] The first step is to add a polyacrylamide anionic surfactant with a number average molecular weight of 20 million to the acid hydrolysis suspension, the concentration of the polyacrylamide is 0.12%, and the amount added is 2% by volume of the suspension. Add while stirring, control the flow rate to ensure that the addition time is within 10-15 minutes;

[0063] In the second step, adding a polyacrylamide cationic surfactant with a number average molecular weight of 20 million, the polyacrylamide concentration is 0.12%, and the addition amount is 2% based on the volume of the suspension, added while stirring with compressed air, and controlled The flow rate is to ensure that the addition time is within 10-15 minutes; the inorganic flocculant...

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Abstract

The invention discloses a method for preparing ceramic pigment titanium dioxide. An introduced purifying technology after ilmenite acidolysis comprises the following steps: 1) adding a certain amount of a polyacrylamide anionic surfactant in an acidolysis fluid suspension; 2) adding a certain amount of a polyacrylamide cationic surfactant and an inorganic salt flocculating agent; and 3) standing for 4-6 hours, extracting half part of clear liquid and conveying the half part of clear liquid to a filter press for solid-liquid separating, performing titanium liquid purification, and then introducing into a vacuum crystallization system for crystallization. A titanyl sulfate hydrolysis technology comprises the following steps: 1) adding seed crystal titanium liquid in liquid alkali to prepare seed crystal; 2) neutralizing the material and aging the material; and 3) adding preheated hydrolysis titanium liquid, heating the material to a boiling state for keeping for 3 hours, and stopping hydrolysis. The purifying technology after ilmenite acidolysis and titanyl sulfate hydrolysis technology are optimized and improved, impurity content in the product is low, product particle size is controlled in D50=2-2.5 [mu]m, and D90 is less than 5[mu]m.

Description

technical field [0001] The invention relates to a method for producing titanium dioxide for ceramic pigments, belonging to the field of titanium dioxide preparation. Background technique [0002] Titanium dioxide, also known as titanium dioxide, is currently the most widely used white pigment, accounting for more than 60% of all white pigments used. 90% of the world's total titanium resources are used to produce titanium dioxide, which is used in many fields. The purity and particle size of titanium dioxide are the key factors affecting the performance of pigments. [0003] At present, the production methods of titanium dioxide mainly include sulfuric acid method and chlorination method. The production cost of the sulfuric acid method is low, and the technology is mature, so most enterprises in our country adopt this method. The production of titanium dioxide by the sulfuric acid method mainly includes three steps: acidolysis of ilmenite, hydrolysis of titanyl sulfate, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
CPCC01G23/0534C01P2004/61C01P2006/80C01P2006/90
Inventor 柴春旺
Owner GUANGXI JINMAO TITANIUM
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