Method and apparatus for removing arsenic from a solution
A solution and equipment technology, applied in the field of removal of toxic metals in aqueous solutions, can solve problems such as expensive and unproven
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Embodiment 1
[0043] Example 1 : Primary treatment of corrosive As-containing mining waste liquid
[0044] These experiments were performed to determine the surface loading:volume ratio necessary to handle corrosive As-containing solutions. Corrosive As-containing solution consists of 5-7g / L As(III), 20g / L Na 2 CO 3 , 4g / L sulfate, 4mg / L Ni and 1mg / L Cu. The pH of the solution was about 10.5. The fixative used in these experiments was high surface area ceria, which was obtained by thermally decomposing cerium carbonate to CeO in a muffle furnace at 300 °C with sufficient exposure to air. 2 be made of.
[0045] One treatment experiment was performed using 200 mL of a caustic As-containing solution at approximately 75°C and adding 3-20 g of thermally decomposed cerium carbonate. Under test conditions, the ceria surface becomes saturated at a loading of 80 mg(As) / g(Ce). When more than 10 g of ceria were added, the arsenic concentration dropped below 0.2% and the surface could no longer...
Embodiment 2
[0049] Example 2 : Two-Stage Countercurrent Treatment of Corrosive As-Containing Solutions
[0050] Corrosive As-containing solutions were prepared by adding 10 g NaAsO to 800 mL of DI water 2 , 20gNa 2 CO 3 , 1mL 1000ppm copper nitrate standard, 0.4mL 10000ppm nickel nitrate standard. The caustic As-containing solution was then diluted to 1 full liter and the pH was titrated down to 10.5 using concentrated HCl. With the addition of nickel sulfate and copper sulfate, most of the nickel and copper precipitate out due to the high pH of the corrosive solution. The resulting corrosive As-containing solution consists of 5g / L As(III), 20g / L Na 2 CO 3 , 300μg / L Ni and 300μg / L Cu. The fixative is also high surface area ceria by thermally decomposing cerium carbonate to CeO in a muffle furnace at 300 °C with sufficient exposure to air 2 be made of.
[0051] The two-stage countercurrent procedure was performed as follows:
[0052] Cycle 1 / Stage 1: 12 g of 300 pyrolytic cerium...
Embodiment 3
[0061] Example 3 : Two-stage countercurrent treatment of acidic As-containing solutions
[0062] The two-stage countercurrent treatment procedure used in Example 2 was also applied to the acidic As-containing solution containing 35 ppm As(III). The acidic solution was prepared by adding 18.72 mL of 5770 ppm As(III), 1074.3 g of nickel(II) sulfate, 250 g of NaCl, 0.63 g of cobalt(II) sulfate, 6 mL of 1000 ppm lead nitrate standard and 1.5 mL of 1000 ppm of Copper nitrate standard was prepared. The solution was then diluted to 3 L to produce a pH of approximately 2.
[0063] The acidic As-containing solution was then treated with pyrolyzed cerium carbonate using a two-stage countercurrent procedure. This method treats 1 liter of acidic As-containing solution with 0.8 g of ceria. Some dissolution of the cerium fixative was observed and measured together with the arsenic concentration of the treated solution. The results are shown in Table 3. In all cases, the arsenic conce...
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