Method for preparing light ceramisite by means of chromium-containing sludge
A light ceramsite and chrome sludge technology, applied in the field of light ceramsite, can solve the problems of low chromium sludge addition ratio, high cost or potential cost, and difficulty in secondary pollution, etc. Low cost, thorough effect of detoxification
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[0041] Example one: Wet-grind the chromium-containing sludge to 150 mesh (the weight is 30wt% of the mixed sludge before firing), add it and dry it to a moisture content of 5% and dry-grind it to 100 mesh municipal sludge, weathered rock, silt, clay or kaolin (The weight is 55wt% of the mixed mud before firing), and then add dry grinding to 100 mesh reducing agent (weight is 10wt% of the mixed mud before firing) and puffing agent (weight is 5wt% of the mixed mud before firing), After mixing uniformly and so on, the mixed sample is pressed into a long ceramsite raw material with a length of 20 mm × a width of 10 mm × a thickness of 10 mm by a granulator, and is dried in the low temperature zone of 300 ℃ at the kiln end of the double-tube rotary kiln 5 for 40 minutes, and then It is calcined in the kiln head at 1200℃ high temperature zone for 50 minutes, and the finished product of light ceramsite is obtained after discharging and cooling.
Example Embodiment
[0042] Embodiment two: Wet-grind the chromium-containing sludge to 160 mesh (the weight is 35wt% of the mixed sludge before firing), add it and dry it to a moisture content of 6% and dry-grind it to 120 mesh municipal sludge, weathered rock, silt or kaolin (weight It is 55wt% of the mixed mud before firing), then add the reducing agent (weight is 9wt% of the mixed mud before firing) and expanding agent (the weight is 1wt% of the mixed mud before firing), and mix well After the treatment, the mixed sample is pressed into a cylindrical ceramic raw material with a length of 20mm and a diameter of 10mm by a granulator, and it is dried in the low temperature zone of the kiln end of the double-tube rotary kiln 5 at 350℃ for 40 minutes, and then at the kiln head at 1250℃ It is calcined in the high temperature zone for 45 minutes, discharged and cooled to obtain a finished product of light ceramsite.
Example Embodiment
[0043] Embodiment three: Wet grind the chromium-containing sludge to 170 mesh (the weight is 40wt% of the mixed sludge before firing), add it and dry it to a moisture content of 7% and dry it to 130 mesh municipal sludge, weathered rock, silt or kaolin (weight It is 50wt% of the mixed mud before firing), then add dry grinding to 130 mesh reducing agent (weight is 8wt% of the mixed mud before firing) and expanding agent (weight is 2wt% of the mixed mud before firing), and mix well After the treatment, the mixed sample is pressed into a spherical ceramic raw material with a diameter of 10mm by a granulator, dried in the 400℃ low temperature zone at the kiln end of the double-tube rotary kiln 5 for 35 minutes, and then calcined in the high temperature zone at 1250℃ in the kiln head. Minutes, the finished product of light ceramsite is obtained after discharging and cooling.
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