Preparation method of heavy metal ion absorbent from phosphogypsum
A technology of adsorbent and phosphogypsum, which is applied in the fields of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems such as air, water system and soil pollution, limited utilization of phosphogypsum, and occupation of land resources. Achieve good social and economic benefits, low production costs, and protect the ecological environment
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Embodiment 1
[0020] 1) Phosphogypsum pretreatment: Phosphogypsum is washed with water and floated to remove organic matter on the surface, and then calcined at 800°C for 2 hours to obtain pretreated phosphogypsum;
[0021] 2) Synthesize the adsorbent with phosphogypsum: Weigh 4g of the pretreated phosphogypsum obtained in step 1) into a beaker, add 100ml of HCl with a mass concentration of 20%, and add 5g of EDTA, stir and react at 20°C for 6 hours, and centrifuge the reaction product Take the supernatant and add 10ml dropwise to a concentration of 1.8molL -1 of (NH 4 ) 2 HPO 4 solution, and then add 0.08g dodecyltrimethylammonium bromide, the mixture with 1 molL -1 Adjust the pH to 5 with NaOH, continue to stir for 8 hours, and finally age the mixed solution at room temperature for 8 hours. The aged product is washed with water to neutrality and then dried to obtain an adsorbent;
[0022] 3) Preparation of heavy metal adsorbent: add polyacrylamide to the adsorbent and adsorption aid ...
Embodiment 2
[0025] 1) Pretreatment of phosphogypsum: Phosphogypsum is washed with water and floated to remove organic matter on the surface, and then calcined at 700°C for 3 hours to obtain pretreated phosphogypsum;
[0026] 2) Synthesize the adsorbent with phosphogypsum: Weigh 4g of the pretreated phosphogypsum obtained in step 1) into a beaker, add 100ml of HCl with a mass concentration of 20%, and add 8 g of EDTA, stir and react at 50°C for 4 hours, and centrifuge the reaction product After that, take the supernatant and add 40ml dropwise to a concentration of 1.2molL -1 of (NH 4 ) 2 HPO 4 solution, and then add 0.01g dodecyltrimethylammonium bromide, the mixed solution with 1 molL -1 Adjust the pH to 8 with NaOH, continue to stir for 5 hours, and finally age the mixed solution at room temperature for 10 hours. The aged product is washed with water until it is neutral, and then dried to obtain an adsorbent;
[0027] 3) Preparation of heavy metal adsorbent: the adsorbent prepared i...
Embodiment 3
[0030] 1) Phosphogypsum pretreatment: Phosphogypsum is washed with water and floated to remove organic matter on the surface, and then calcined at 500°C for 4 hours to obtain pretreated phosphogypsum;
[0031] 2) Synthesize the adsorbent with phosphogypsum: Weigh 4g4g of the pretreated phosphogypsum obtained in step 1) into a beaker, add 100ml of HCl with a mass concentration of 20%, and add 13g of EDTA, stir and react at 80°C for 3 hours, and the reaction product is centrifuged Take the supernatant, add 50ml dropwise to a concentration of 0.5molL -1 of (NH 4 ) 2 HPO 4 Solution, then add 0.1g dodecyltrimethylammonium bromide, the mixture with 1 molL -1 Adjust the pH to 12 with NaOH, continue to stir for 1 hour, and finally age the mixed solution at room temperature for 16 hours. The aged product is washed with water until it is neutral, and then dried to obtain an adsorbent;
[0032] 3) Preparation of heavy metal adsorbent: add magnesium oxide to the adsorbent and adsorpt...
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