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Method for preparing titanium phosphate from titanium dioxide waste acid

A technology of titanium white waste acid and titanium phosphate, which is applied in the fields of chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of mesoporous and new structure titanium phosphate with few studies, single synthesis method of titanium phosphate, and application of new templating agent Less problems, to achieve the effect of fast product precipitation, good crystal form, and cost saving

Active Publication Date: 2017-11-07
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After decades of research by research institutes and institutions of higher learning, many achievements have been made in the synthesis and performance research of nano-scale titanium phosphate and porous titanium phosphate, but there are still many problems to be solved: (1) Although the current partial structure of phosphoric acid The research on titanium has been relatively mature, but there are not many studies on mesoporous and new structure titanium phosphate; (2) The synthesis methods of titanium phosphate, especially mesoporous titanium phosphate, are relatively simple, mainly including hydrothermal method, solvothermal method and sol (3) Most of the templates for the synthesis of titanium phosphate are ionic surfactants, and the application of new templates is relatively small
In the method of preparing titanium phosphate using phosphoric acid and titanium dioxide as raw materials, the final reaction product obtained is colloidal, and the settling speed is slow, and the finally obtained titanium phosphate has poor crystallinity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A certain amount of titanium dioxide waste acid was weighed and added to a five-neck flask, then heated to 80 °C with a heating mantle, and injected with a mass concentration of 5% (NH 4 ) 2 HPO 4 Solution, finished within 5 minutes, the mass ratio of titanium dioxide and diammonium hydrogen phosphate in titanium dioxide waste acid is 1:2.5, fully mixed and stirred, kept warm for 5 minutes, cooled slightly, filtered, washed once with 200ml desalted water, and then analyzed Titanium content in the filtrate, put the filter residue into a constant temperature oven 105 o C for 2 hours;

[0024] Finally, grind the dried filter residue into a crucible for calcination. The calcination temperature is 800° C. and the calcination time is 2 hours to obtain the titanium phosphate product.

[0025] The performance of this group of filtrate and filter residue reaches the following indicators:

[0026] After analysis, the titanium content in the filtrate is 0.5%, and the removal r...

Embodiment 2

[0028] A certain amount of titanium dioxide waste acid was weighed and added to a five-neck flask, then heated to 85 °C with a heating mantle, and injected with a mass concentration of 10% (NH 4 ) 2 HPO 4 Solution, finished within 30 minutes, the mass ratio of titanium dioxide and diammonium hydrogen phosphate in titanium dioxide waste acid is 1:3, fully mixed and stirred, kept warm for 30 minutes, cooled slightly, filtered, washed with 600ml desalted water for 3 times, each time 200ml, then analyze the titanium content in the filtrate, put the filter residue into a constant temperature oven 105 o C for 2 hours;

[0029] Finally, grind the dried filter residue into a crucible for calcination. The calcination temperature is 850° C. and the calcination time is 2 hours to obtain the titanium phosphate product.

[0030] The performance of this group of filtrate and filter residue reaches the following indicators:

[0031] After analysis, the titanium content in the filtrate wa...

Embodiment 3

[0033] A certain amount of titanium dioxide waste acid was weighed and added to a five-neck flask, then heated to 100 °C with a heating mantle, and injected with a mass concentration of 12% (NH 4 ) 2 HPO 4 Solution, finished within 40 minutes, the mass ratio of titanium dioxide and diammonium hydrogen phosphate in titanium dioxide waste acid is 1:3.5, fully mixed and stirred, kept for 40 minutes, cooled slightly, filtered, washed 4 times with 800ml desalted water, each time 200ml, then analyze the titanium content in the filtrate, put the filter residue into a constant temperature oven 105 o C for 2 hours;

[0034] Finally, grind the dried filter residue into a crucible for calcination, the calcination temperature is 1000°C, and the calcination time is 2 hours to obtain the titanium phosphate product.

[0035] The performance of this group of filtrate and filter residue reaches the following indicators:

[0036] After analysis, the titanium content in the filtrate was 0.03...

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PUM

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Abstract

The invention relates to a method for preparing titanium phosphate from a titanium dioxide waste acid. The titanium phosphate is prepared from a titanium dioxide waste acid and ammonium hydrogen phosphate, and the titanium dioxide waste acid is a waste acid generated when titanium dioxide is prepared by using a sulfuric acid method. The method specifically comprises the following steps: 1) putting an ammonium hydrogen phosphate solution into heated titanium dioxide waste acid, stirring, and performing a heat-preservation reaction so as to obtain precipitate, wherein the mass ratio of the ammonium hydrogen phosphate to the titanium dioxide in the titanium dioxide waste acid is (2.5-5): 1; 2) filtering the precipitate obtained in the step 1), washing with desalfting water, and drying so as to obtain filter slag; and 3) calcining the filter slag obtained in the step 2), thereby obtaining titanium phosphate. By adopting the method, the titanium dioxide waste acid can be recycled and used, and the cost can be reduced, the method has the advantages of being simple to operate, rapid in product precipitation speed and high in reaction yield, and in addition the prepared titanium phosphate is relatively good in crystal form.

Description

technical field [0001] The invention relates to a method for preparing titanium phosphate from titanium white waste acid, which belongs to the field of recovery of titanium white waste acid. Background technique [0002] In the process of producing titanium dioxide by the sulfuric acid method, 8-10 tons of waste acid with a concentration of about 20% will be produced for every 1 ton of titanium dioxide produced. In addition to the main component H, the waste acid contains 2 SO 4 In addition, it also contains a large amount of TiO 2 . In the prior art, the recovery of waste acid is generally to recycle sulfuric acid after concentration, wherein TiO 2 If it is not effectively utilized, the economic benefit is not high. [0003] On the other hand, as a new type of inorganic chemical product, titanium phosphate has the advantages of non-toxicity, strong hiding power, strong adhesion, strong ultraviolet reflection ability, heat resistance and flame retardancy, etc. It can be ...

Claims

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Application Information

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IPC IPC(8): C01B25/37
Inventor 席海红张玉荣周春勇何丰陈开明
Owner SICHUAN LOMON TITANIUM IND CO LTD