Chromic slag treatment method of detoxifying hexavalent chromium directly by biologic method
A treatment method and hexavalent chromium technology, applied in the removal of solid waste and other directions, can solve the problems of high treatment cost and incomplete detoxification, and achieve the effects of reducing treatment cost, reducing acid consumption and improving detoxification efficiency.
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Embodiment 1
[0025] 1) Take 1 ton of chromium slag and add 3 tons of water, crush the chromium slag into 200 mesh with a ball mill, add 7 tons of water to make a chromium slag slurry, pass carbon dioxide while stirring, the system pressure is 1 atm, the pH value is 9, The temperature is 15°C and the salinity is 5g / L;
[0026] 2) After 5 hours, carry out solid-liquid separation to the above-mentioned chromium slag slurry;
[0027] 3) insert 5% anaerobic bacteria into the solution obtained by separation, and recover hexavalent chromium in the solution after being reduced to trivalent chromium,
[0028] 4) Add 5 tons of water to the separated solid slag, continue to pass carbon dioxide, and then inoculate a composite bacterial solution composed of 2% sulfate-reducing bacteria (SRB), Pseudomonas putida and Escherichia coli, At a temperature of 15°C and a pressure of 1 atm, a microbial reduction reaction was carried out for 100 hours to directly reduce the residual solid hexavalent chromium in...
Embodiment 2
[0031] 1) Take 1 ton of chromium slag and add 3 tons of water, crush the chromium slag into 80 meshes with a ball mill, add 12 tons of water to make a chromium slag slurry, pass carbon dioxide while stirring, the system pressure is 2atm, the pH value is 8, The temperature is 35°C and the salinity is 60g / L;
[0032] 2) after 10 hours, carry out solid-liquid separation to the above-mentioned chromium slag slurry;
[0033] 3) insert 10% anaerobic bacteria into the solution obtained by separation, and recover hexavalent chromium in the solution after being reduced to trivalent chromium,
[0034] 4) Add 10 tons of water to the separated solid slag, continue to pass carbon dioxide, and then inoculate a composite bacterial solution (anaerobic bacteria) composed of 12% SRB, Pseudomonas putida, and Escherichia coli, at a temperature of 35°C and a pressure of 2atm, Carry out microbial reduction reaction for 10 hours, and directly reduce the solid hexavalent chromium remaining in the sl...
Embodiment 3
[0037] 1) Take 1 ton of chromium slag and add 3 tons of water, grind the chromium slag into 50 meshes with a ball mill, add 2 tons of water to make a chromium slag slurry, pass carbon dioxide while stirring, the system pressure is 5atm, the pH value is 6, The temperature is 80°C and the salinity is 100g / L;
[0038] 2) After 0.5 hours, carry out solid-liquid separation to the above-mentioned chromium slag slurry;
[0039] 3) insert 20% anaerobic bacteria into the solution obtained by separation, and recover hexavalent chromium in the solution after being reduced to trivalent chromium,
[0040] 4) Add 20 tons of water to the separated solid slag, continue to pass carbon dioxide, and then inoculate a composite bacterial solution composed of 20% SRB, Peudomonas putida, and Escherichia coli, and carry out microbial reduction reaction 1 at a temperature of 90°C and a pressure of 5atm hours, the residual solid hexavalent chromium in the slag is directly reduced to trivalent chromium...
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