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Method for adsorption treatment of cesium-containing wastewater through using heat modified attapulgite adsorbent

A technology of attapulgite and adsorbent, which is applied in the field of thermally modified attapulgite adsorbent to treat cesium-containing wastewater, which can solve the problems of many types of raw materials and complicated preparation processes, and achieve simple operation process, strong economy, and adsorption conditions less demanding effect

Inactive Publication Date: 2013-12-18
王金生 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent Publication No. 200410020879 introduces a method for treating heavy metals and radioactive metal ions by using WK ​​adsorption materials, and Patent Publication No. 200810000889 introduces a method for treating heavy metals and radionuclides by using oxidized hydrophobic glucomannan adsorption materials. Both methods have a high removal rate for heavy metals and radioactive metal ions, which fully reflects the high adsorption performance of the adsorption material. However, there are many types of raw materials used in the two methods, and the preparation process is complicated.
The current literature has reported that attapulgite can remove COD from wastewater, and the removal rate can be as high as 86%, and some even reach 100%, and the regeneration rate is high and can be reused. no report

Method used

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  • Method for adsorption treatment of cesium-containing wastewater through using heat modified attapulgite adsorbent
  • Method for adsorption treatment of cesium-containing wastewater through using heat modified attapulgite adsorbent
  • Method for adsorption treatment of cesium-containing wastewater through using heat modified attapulgite adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The purified attapulgite was placed in a muffle furnace, fired at 400° C. for 1.5 hours, and the modified attapulgite adsorbent was obtained.

[0045] Accurately weigh 1.5000g (±0.0005g) of thermally modified attapulgite adsorbent, place it in a 250mL conical flask with a stopper, add 30mL of cesium chloride solution with a concentration of 100mg / L, and place it in a constant temperature oscillator , oscillating at a rate of 150 r / min at a temperature of 25°C, at this time the mass ratio of cesium in the cesium-containing wastewater to the adsorbent is 1:500. The supernatant was taken at 0.5h, 1h, 3h, 6h, 6h, 24h, and 48h respectively, and the concentration of residual cesium was tested by an inductively coupled plasma emission mass spectrometer (ICP-MS). Three groups of parallel experiments were set for each experiment, and the results were expressed as arithmetic mean values, and standard deviations were calculated to ensure test accuracy. The calculated removal rate...

Embodiment 2

[0049] The thermally modified attapulgite adsorbent was prepared in the same way as in Example 1.

[0050] Accurately weigh 0.5000g (±0.0005g) of the thermally modified attapulgite adsorbent, place it in a 250mL conical flask with a stopper, add 10mL of cesium chloride solutions with concentrations of 10, 20, 50, and 100mg / L respectively , placed in a constant temperature oscillator, oscillating at a rate of 150r / min at a temperature of 25°C for 48h to adsorption equilibrium, at this time the mass ratios of cesium in the cesium-containing wastewater to the adsorbent are 1:5000, 1:2500, 1: 1000, 1:500. The supernatant was taken to measure the concentration of residual cesium with an inductively coupled plasma emission mass spectrometer (ICP-MS). Three parallel groups were set for each experiment, and the results were expressed as arithmetic mean values, and the standard deviation was calculated to ensure test accuracy. After calculation, the adsorption and removal rates of ces...

Embodiment 3

[0053] The thermally modified attapulgite adsorbent was prepared in the same way as in Example 1.

[0054] Accurately weigh 0.5000g (±0.0005g) of the thermally modified attapulgite adsorbent, put it in a 250mL conical flask with a stopper, add 10mL of cesium chloride solution with a concentration of 100mg / L, and place it in a constant temperature oscillator , at 5, 15, 25, and 40°C, respectively, at 5, 15, 25, and 40°C, oscillating at a rate of 150r / min for 24h to reach adsorption equilibrium. At this time, the mass ratio of cesium in the cesium-containing wastewater to the adsorbent is 1:500. The supernatant was taken to measure the concentration of residual cesium with an inductively coupled plasma emission mass spectrometer (ICP-MS). Three parallel groups were set for each experiment, and the results were expressed as arithmetic mean values, and the standard deviation was calculated to ensure test accuracy. After calculation, the adsorption and removal rates of cesium are 9...

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Abstract

The invention relates to a method for the adsorption treatment of cesium-containing wastewater through using a heat modified attapulgite adsorbent. The method is characterized in that the concentration of cesium in the wastewater is 5-150mg / L; the heat modified attapulgite adsorbent is added to the cesium-containing wastewater according to a mass ratio of the cesium-containing wastewater to the adsorbent of 1:(500-5000); and an adsorption process is carried out in a static and / or oscillation and stirring mode at 0-50DEG C. The heat modified attapulgite adsorbent is added into the wastewater against the cesium-polluted water to adsorb and remove. The method has the advantages of high cesium adsorption efficiency, simple operation process, low adsorption condition requirement, low cost and high regeneration efficiency of the adsorption material, and easy popularization, and has good economic and environmentally-friendly benefits when the method is used for removing cesium in water.

Description

technical field [0001] The invention relates to the field of cesium-containing wastewater treatment, and more specifically relates to a method for treating cesium-containing wastewater with a heat-modified attapulgite adsorbent. Background technique [0002] Cesium is a silvery alkali metal. Metal cesium is mainly used in the manufacture of photocells, spectrographs, scintillation counters, radio tubes, military infrared signal lights, and various optical instruments and testing instruments. Cesium compounds are commonly used in the production of glass and ceramics, as absorbents in carbon dioxide purification devices, as getters for radio tubes, and in microchemistry. In the pharmaceutical industry, cesium salts can also be used as an anti-shock agent after taking arsenic-containing drugs. At present, cesium is widely used in the atomic energy industry, especially in the nuclear industry. As one of the products of uranium nuclear fission, radioactive cesium appears in lar...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/32G21F9/12C02F1/28C02F1/58
Inventor 王金生李剑孙丹妮滕彦国左锐
Owner 王金生
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