Sulphoaluminate cement-bentonite composite material for adsorbing heavy metal ions and preparation method and application thereof
A technology of sulfoaluminate cement and adsorption of heavy metals, applied in the direction of adsorption water/sewage treatment, ion exchange water/sewage treatment, silicate, etc., can solve the problems of high cost of adsorbent production and cumbersome process, and achieve strong adsorption Ability, good ion exchange effect
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[0025] The present invention is used for the preparation method of the sulphoaluminate cement-bentonite composite material of solidifying heavy metal ion, comprises the following steps:
[0026] Step 1, uniformly mixing sulfoaluminate cement, bentonite and water in a magnetic mixer, the stirring speed is 1000-1500rpm, and the stirring time is 2-3h;
[0027] Step 2, the mixture is sealed and stored at 20±2°C for 7 days, centrifuged and filtered, and the separated solid is dried in a vacuum oven at 35-40°C;
[0028] In step 3, the dried solid is ground and passed through a 100-mesh sieve to obtain a sulphoaluminate cement-bentonite composite material for absorbing heavy metal ions.
[0029] Wherein, in step 1, in terms of mass parts, among the raw materials for preparing the sulphoaluminate cement-bentonite composite material for solidifying heavy metal ions: 25-75 parts of sulphoaluminate cement, 25-75 parts of bentonite, The quality of water is 10 times of the sum of sulphoal...
Embodiment 1
[0032] Mix 37.50g of sulphoaluminate cement, 12.50g of calcium-based bentonite and 500g of water uniformly in a magnetic stirrer to obtain a mixture. The stirring speed is 1000rpm and the stirring time is 2h; the mixture is sealed and stored at 20±2°C for standing After 7 days, centrifuge and filter, and the separated solids are dried in a vacuum oven at 35°C; the dried solids are ground and passed through a 100-mesh sieve to obtain sulphoaluminate cement for absorbing heavy metal ions- Bentonite composite. Put 0.1g of sulphoaluminate cement-bentonite composite material into the initial concentration of 100mg L -1 in a solution of heavy metal ions Cr(III), then in a constant temperature horizontal shaker at 200r·min -1 Under the conditions of adsorption, the adsorption time is 2h, and the residual concentration of Cr(III) ions in the solution is measured to be 0.027mg L -1 , the calculated removal rate of Cr(III) ions was 99.975%.
Embodiment 2
[0034]Mix 37.50g of sulphoaluminate cement, 12.50g of calcium-based bentonite and 500g of water uniformly in a magnetic stirrer to obtain a mixture. The stirring speed is 1000rpm and the stirring time is 2h; the mixture is sealed and stored at 20±2°C for standing After 7 days, centrifuge and filter, and the separated solids are dried in a vacuum oven at 35°C; the dried solids are ground and passed through a 100-mesh sieve to obtain sulphoaluminate cement for absorbing heavy metal ions- Bentonite composite. Put 0.1g of sulphoaluminate cement-bentonite composite material into the initial concentration of 100mg L -1 in a solution of heavy metal ions Pb(II), then in a constant temperature horizontal shaker at 200r·min -1 Under the conditions of adsorption, the adsorption time is 2h, and the residual concentration of Pb(II) ions in the solution is measured to be 0.186mg L -1 , the calculated removal rate of Pb(II) ions was 99.814%.
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