A kind of shale ceramsite sand and preparation method thereof
A technology of shale ceramsite and ceramsite sand, which is applied in the field of ceramsite sand, can solve the problems of difficult to achieve product water absorption and cylinder compressive strength, poor stability, etc., and achieve stable performance, high cylinder compressive strength, water absorption low rate effect
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[0021] The invention provides a kind of preparation method of shale ceramsite sand, comprises the following steps:
[0022] a) mixing the sludge with crushed shale, then aging, dispersing and granulating in sequence to obtain raw ceramsite sand; the moisture content of the sludge is 75% to 85%; the crushed The particle size of shale is greater than 0 and less than or equal to 2mm;
[0023] b) calcining the ceramsite sand raw material obtained in step a) to obtain shale ceramsite sand.
[0024] The invention first mixes the sludge with the crushed shale, and then performs aging, dispersion and granulation in sequence to obtain the ceramsite sand raw meal. In the present invention, the moisture content of the sludge is 75%-85%, preferably 80%. The sludge is provided by the sewage treatment plant in the main urban area of Chongqing. At present, the sludge treatment of the sewage treatment plant in the main urban area of Chongqing is mainly based on the co-processing of ceme...
Embodiment 1
[0038] (1) Send the shale from the shale yard to the jaw crusher with a forklift for primary crushing (coarse crushing) to obtain the primary crushed shale with a particle size of 5 mm to 10 mm; The above-mentioned shale is transported to the closed roller crusher through the belt for secondary crushing (fine crushing), and the second-stage crushed shale with a particle size greater than 0 and less than or equal to 2mm is obtained; then the crushed shale is passed through the belt Transport to the twin-shaft mixer, and at the same time, the sludge is sent to the above-mentioned twin-shaft mixer through the screw conveyor, and the mass ratio of the sludge to the crushed shale is controlled to be 5:1 for stirring and mixing for 8 minutes; after that, the mixed sludge is sent to the Pair roller compactor to make mud flakes.
[0039] (2) Transport the mud flakes obtained in step (1) to a closed aging bin and age at 25°C for 6 days; then send the aged mud flakes into a twin-shaft m...
Embodiment 2
[0043] (1) Send the shale from the shale yard to the jaw crusher with a forklift for primary crushing (coarse crushing) to obtain the primary crushed shale with a particle size of 5 mm to 10 mm; The above-mentioned shale is transported to the closed roller crusher through the belt for secondary crushing (fine crushing), and the second-stage crushed shale with a particle size greater than 0 and less than or equal to 2mm is obtained; then the crushed shale is passed through the belt Transport to the twin-shaft mixer, and at the same time, the sludge is sent to the above-mentioned twin-shaft mixer through the screw conveyor, and the mass ratio of the sludge to the crushed shale is controlled to be 6:1 for stirring and mixing for 7 minutes; after that, the mixed sludge is sent to the Pair roller compactor to make mud flakes.
[0044] (2) Transport the mud flakes obtained in step (1) to a closed aging bin, and age them at 25°C for 5 days; then send the aged mud flakes into a twin-s...
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Abstract
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