Heavy metal adsorption material as well as preparation method and application thereof
A technology for adsorbing materials and heavy metals, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve problems such as high price, inability to large-scale application of environmental remediation, soil acidification, etc.
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[0035] An embodiment of the present invention provides a method for preparing a heavy metal adsorption material, comprising the following steps:
[0036] S10, providing a mixed oxide material, the mixed oxide material includes calcium oxide and aluminum oxide, the content of the calcium oxide is 25wt% to 50wt%, the content of the aluminum oxide is 7wt% to 15wt%, the oxide The content of magnesium is 6.5wt%~50wt%;
[0037] S20, adding the mixed oxide material into an acidic solution to fully react to obtain a solution containing metal ions; and
[0038] S30, adding an alkaline solution to the solution containing metal ions, adjusting the pH to 10-12, and co-precipitating to obtain a mixed hydroxide.
[0039] The preparation method of the heavy metal adsorption material provided by the embodiment of the present invention uses the mixed oxide material whose composition is 30wt%-60wt% calcium oxide, 15wt%-30wt% alumina and 6.5wt%-50wt% magnesia as raw material, through and The a...
Embodiment 1
[0070] 1. Take the blast furnace slag (100g) of oxide composition described in Table 1 as raw material.
[0071] 2. Add blast furnace slag (100g) into 3mol / L hydrochloric acid (2L) according to the solid:liquid ratio of 1:20g / mL, react at 80°C for 4h, and filter to obtain the filtrate.
[0072] 3. Gradually add 4 mol / L sodium hydroxide dropwise to the obtained filtrate to make the pH of the reaction system reach 11.5. The pH-adjusted solution was heated at 80° C. for 24 hours to crystallize out the crystals, and dried to obtain the mixed hydroxide a.
[0073] 4. Put the mixed hydroxide a in a muffle furnace for calcination at 500° C. for 2 hours to obtain the composite oxide a.
Embodiment 2
[0075] 1. Take the blast furnace slag (80g) and magnesium oxide (20g) of the oxide composition described in Table 1 as raw materials, and mix under dry conditions for 30min.
[0076] 2. Add the mixed solid (100g) in step 1 into 3mol / L hydrochloric acid (2L) according to the solid:liquid ratio of 1:20g / mL, react at 80°C for 4h, and filter to obtain the filtrate.
[0077] 3. Gradually add 4 mol / L sodium hydroxide dropwise to the obtained filtrate to make the pH of the reaction system reach 11.5. The pH-adjusted solution was heated at 80° C. for 24 h to crystallize out and dried to obtain the mixed hydroxide b.
[0078] 4. Calcining the mixed hydroxide b in a muffle furnace at 500° C. for 2 hours to obtain the composite oxide b.
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