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A method and device for desorption and recycling of thallium-containing titanium peroxide

A titanium peroxide and desorption technology, applied in chemical instruments and methods, separation methods, filtration and separation, etc., to achieve the effects of improving purity and washing effect, high desorption rate, and enhancing mixing and stirring efficiency

Active Publication Date: 2022-04-19
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to the best of our knowledge, there is no information available for the removal of thallium peroxide from water

Method used

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  • A method and device for desorption and recycling of thallium-containing titanium peroxide
  • A method and device for desorption and recycling of thallium-containing titanium peroxide
  • A method and device for desorption and recycling of thallium-containing titanium peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A desorption recycling method containing thallium peroxide titanium, comprising the following steps:

[0037] S1: Using a desorption device to add titanium peroxide containing TL(I) to excess 1M HNO 3 In the solution, control the temperature at 20°C, stir for 7 minutes, and filter to obtain the primary precipitate; add 110kHz high-frequency ultrasonic waves during the period, and the ultrasonic intensity is 0.5w / cm 2 ;

[0038] S2: The primary precipitate obtained from the S1 solution was washed twice with deionized water, then the primary precipitate was reacted with concentrated sulfuric acid with a mass ratio of 0.8 times, boiled and filtered again to obtain clear liquid and precipitate A;

[0039] S3: Mix the clear liquid with 30% hydrogen peroxide mass concentration at a volume ratio of 2:1. After the reddish-brown solution is obtained, control the solution temperature at 52° C., and then add 10% ammonia mass concentration drop by drop until the solution The pH w...

Embodiment 2

[0049] The difference from Example 1 is that the temperature of the solution in S3 is controlled at 52°C; firstly, it is heated to 32°C, and then the temperature is raised to 52°C at 2°C / min, and ammonia water is added drop by drop during the temperature rise.

[0050] The titanium peroxide purity that embodiment 1 makes is 92.3%;

[0051] The titanium peroxide purity that embodiment 2 makes is 97.4%.

[0052] Conclusion: the purity of titanium peroxide obtained by the method of Example 2 is higher, up to 97.4%, which is more conducive to the subsequent re-adsorption use and improves the adsorption efficiency.

Embodiment 3

[0054] The difference from Example 1 is that it is washed with water before steam washing in S4. The water washing is washed with deionized water and supplemented with ultrasonic treatment. The ultrasonic wave adopts a combination of low frequency, high frequency and any two. 55kHz, high frequency is 130kHz.

[0055] Low frequency and high frequency: low frequency is 30kHz, high frequency is 130kHz, the purity of titanium peroxide is 99.2%;

[0056] Intermediate frequency and high frequency: the intermediate frequency is 55kHz, the high frequency is 130kHz, and the purity of titanium peroxide is 98.3%;

[0057] Low frequency and intermediate frequency: the low frequency is 30kHz, the intermediate frequency is 55kHz, the purity of titanium peroxide is 97.8%;

[0058] Conclusion: Compared with medium frequency plus high frequency and low frequency plus medium frequency, the dual frequency of low frequency plus high frequency is used for auxiliary ultrasonic treatment, which is ...

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Abstract

The invention discloses a method and device for desorption and recycling of titanium peroxide containing thallium. The method comprises the following steps: S1: adding titanium peroxide containing TL(I) into HNO3 solution, stirring and filtering to obtain primary precipitate S2: wash the initial precipitate, then react with concentrated sulfuric acid, and filter again to obtain the clear liquid and precipitate A; S3: mix the clear liquid with hydrogen peroxide, then drip ammonia water drop by drop, and collect the precipitate B; S4 : Precipitate A in S2 and Precipitate B in S3 are carried out multi-stage washing; S5: Precipitate A and Precipitate B are dry stored. Improve the recovery rate of titanium peroxide and enhance the effect of desorption cycle.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method and device for desorption and recycling of thallium-containing titanium peroxide. Background technique [0002] Thallium is a highly toxic pollutant to mammals, and its removal from water bodies has received increasing attention. Higher than other heavy metals such as mercury, lead, cadmium, copper and zinc. Chronic thallium poisoning can cause anorexia, headache, abdominal pain, hair loss, blindness and even death. To minimize these health risks, the U.S. Environmental Protection Agency (USEPA) set a maximum contaminant level (MCL) of 2 μL TL as the drinking water standard, while a stricter limit of 0.1 μg TL was adopted in China. [0003] In water, thallium exists in two oxidation states: thallium(I) and thallium(III), and while TL(I) is considered more difficult to remove, its removal has received more attention. Such as chemical precipitation, oxidati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/34C02F1/28C02F101/20
CPCB01J20/3433B01J20/3441B01J20/3475C02F1/281C02F2101/20
Inventor 齐剑英王圣武范芳
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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