A kind of biomass wet detoxification method containing hexavalent chromium waste residue
A wet detoxification and biomass technology, applied in the removal of solid waste, etc., can solve the problems of high detoxification cost, risk of detoxification effect, small treatment volume, etc., achieve low detoxification cost, good industrial application prospects, and reduce treatment costs Effect
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Embodiment 1
[0046] Slurry the chromium-containing waste residue containing 0.117% of hexavalent chromium in the slurry tank at 30°C for 3 hours (the liquid-solid ratio is 10:1), add a certain amount of hydrochloric acid to adjust the pH to 9.40; add orange peel to the slurry , the amount of orange peel added is 90% of the weight of the original chrome residue, and it is slurried at 50 ° C for 5 hours. After the reaction, the filtered chromium slag was tested for leaching toxicity. The concentration of hexavalent chromium in the leaching solution was 2.57 mg / L, basically meeting the landfill standard for general solid waste.
Embodiment 2
[0048] Slurry the chromium-containing waste residue containing 0.135% hexavalent chromium in the slurry tank at 50°C for 2 hours (the liquid-solid ratio is 5:1), add a certain amount of nitric acid to adjust the pH to 9.23; add orange peel to the slurry , the amount of orange peel added is 60% of the weight of the original chromium slag, and it is treated at 70°C for 3h. After the reaction, the filtered chromium slag was tested for leaching toxicity. The hexavalent chromium concentration in the leaching solution was 1.74 mg / L, which met the landfill standard for general solid waste.
Embodiment 3
[0050] Slurry the chromium-containing waste residue containing 0.179% hexavalent chromium in a slurry tank at 85°C for 2 hours (liquid-solid ratio is 5:1), add a certain amount of nitric acid to adjust the pH to 9.23; add banana peel to the slurry , the amount of banana peel added is 30% of the weight of the original chromium slag, and it is treated at 85°C for 1h. After the reaction, the filtered chromium slag was tested for leaching toxicity. The concentration of hexavalent chromium in the leaching solution was 2.34 mg / L, which met the landfill standard for general solid waste.
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