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Titanium dioxide aluminum coating technology with cost advantage

An aluminum coating, titanium dioxide technology, applied in inorganic pigment treatment, chemical instruments and methods, fibrous fillers, etc., can solve problems such as the decrease of bulk density and the effect of product gloss, and achieve the effect of reducing the amount of acid and alkali and saving costs.

Active Publication Date: 2018-09-28
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain problems in this process. For general-purpose titanium dioxide, the bulk density of the product containing the acid side coating will decrease, and the gloss of the product will also be affected.

Method used

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  • Titanium dioxide aluminum coating technology with cost advantage

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Comparison scheme
Effect test

Embodiment 1

[0023] A kind of titanium dioxide aluminum coating process with cost advantage comprises the following steps: adopting mass concentration is 40g / L (as Al 2 o 3 count) NaAlO 2 The solution adjusts the pH value of the titanium dioxide slurry to 8-11; the NaAlO with a mass concentration of 40g / L 2 The solution and the mass concentration are 40g / L (as Al 2 o 3 count) AlCl 3 The solution is added to the titanium dioxide slurry in parallel, and the pH value of the slurry is controlled to be 8-11; the sulfuric acid solution with a mass concentration of 3% and NaAlO with a mass concentration of 40g / L 2 The solution is added into the slurry in parallel, and the pH value of the slurry is controlled to be 8-11, and the amount of aluminum coating in this step is 0.2%; the pH value of the slurry is adjusted to 6 with a sulfuric acid solution with a mass concentration of 3%. -8. After aging for 30-90 minutes, the reaction is completed, filtered and washed, and then dried to obtain the ...

Embodiment 2

[0025] A kind of titanium dioxide aluminum coating process with cost advantage, comprises the following steps: adopting mass concentration is 100g / L (as Al 2 o 3 count) NaAlO 2 The solution adjusts the pH value of the titanium dioxide slurry to 8-11; the NaAlO with a mass concentration of 100g / L 2 The solution and the mass concentration are 100g / L (as Al 2 o 3 count) AlCl 3 The solution is added to the titanium dioxide slurry in parallel, and the pH value of the slurry is controlled to be 8-11; the hydrochloric acid solution with a mass concentration of 10% and the NaAlO solution with a mass concentration of 100g / L 2 Solution co-flows into the slurry, and the pH value of the control slurry is 8-11, and the aluminum coating amount in this step is 0.5% of the total aluminum coating amount; The pH value is adjusted to 6-8, the reaction is completed after aging for 30-90 minutes, filtered and washed, and then dried to obtain the finished product.

Embodiment 3

[0027] A kind of titanium dioxide aluminum coating process with cost advantage comprises the following steps: adopting mass concentration is 150g / L (as Al 2 o 3 count) KAlO 2 The solution adjusts the pH value of the titanium dioxide slurry to 8-11; the KAlO with a mass concentration of 150g / L 2 The solution and the mass concentration are 150g / L (as Al 2 o 3 Gauge) Al 2 (SO 4 ) 3 The solution is added to the titanium dioxide slurry in parallel flow, and the pH value of the slurry is controlled to be 8-11; the nitric acid solution with a mass concentration of 30% and the KAlO solution with a mass concentration of 150g / L 2 The solution is added into the slurry in parallel, and the pH value of the slurry is controlled to be 8-11, and the aluminum coating amount in this step is 0.8%; the pH value of the slurry is adjusted to 6-10 with a nitric acid solution with a mass concentration of 30%. 8. After aging for 30-90 minutes, the reaction is completed, filtered and washed, and...

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Abstract

The invention discloses a titanium dioxide aluminum coating technology with the cost advantage. The technology comprises the following steps: 1) adjusting the pH value of a titanium dioxide slurry to8-11 by using a metaaluminate solution; 2) adding the metaaluminate solution and an acidic aluminum salt solution to the titanium dioxide slurry in a cocurrent flow manner to control the pH value of the slurry to 8-11; 3) adding an acid solution and a metaaluminate solution to the slurry obtained in the step 2) in a cocurrent flow manner to control the pH value of the slurry to 8-11; and 4) adjusting the pH value of the slurry obtained in step 3) to 6-8 by using the acid solution. The aluminum coating technology of titanium dioxide is improved, the use amount of acids and alkalis for adjustingthe pH value is reduced, the cost is saved, and obtained coated titanium dioxide still can keep excellent glossiness and product compactness.

Description

technical field [0001] The invention belongs to the field of titanium dioxide production, and in particular relates to a titanium dioxide aluminum coating process with cost advantages. Background technique [0002] Since the isoelectric point of the aluminum coating is pH 7-9, if the titanium dioxide is coated with an aluminum film, it is easy to flocculate and agglomerate at this pH value, which can greatly reduce the amount of filtration of the titanium dioxide during washing. On the other hand, the aluminum coating Coating can also improve the dispersibility of the product, so titanium dioxide that requires inorganic coating technology needs to be coated with aluminum no matter which field it is used in. At present, most of the aluminum coating processes are coated on the alkali side, usually using metaaluminate for coating, metaaluminate is alkaline, and some are coated on the acid side, usually aluminum metallate Coating, the coating agent is slightly acidic. Regardle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
CPCC01P2006/11C01P2006/60C09C1/3661
Inventor 张玉荣林发蓉张强杜国华周春勇姚恒平
Owner SICHUAN LOMON TITANIUM IND CO LTD
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