Resource disposal method by conditioning and incinerating crop straw and sewage sludge
A technology for crop stalks and sewage sludge, which is applied in combustion methods, incinerators, cement production, etc., can solve the problems of sludge treatment and disposal costs, reduce heavy metal leaching, increase porosity, and avoid stickiness zone effect
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Embodiment 1
[0035] Mix straw powder and sludge with a moisture content of 70% by weight at a weight ratio of 1:5 at 15°C, add 0.1% by weight of heavy metal stabilizer for conditioning, and the composition by weight percentage is: orthophosphate 20% for calcium oxide, 20% for calcium oxide, 40% for fluoroapatite, and 20% for silica. Fully mix and stir for 15 minutes, and the pH is 6. After washing and filtering, the moisture content of the mixture of straw powder and sludge decreases When it reaches 70% by weight, steam is used as the drying medium for drying at 160°C, and the moisture content of the straw powder and sludge mixture is reduced to 45% by weight, which is in the form of solid particles; the straw and sludge mixture after powder treatment can be directly dried. Combustion is used as a coal alternative energy source for thermal power generation. The residue and incineration fly ash after incineration can be used as cement raw materials. The residue and incineration fly ash are 3%...
Embodiment 2
[0037] Mix straw powder and sludge with a moisture content of 85% by weight at a weight ratio of 1:20 at 30°C, add 1% by weight of heavy metal stabilizer for conditioning, and the composition by weight percentage is: orthophosphate 40%, calcium oxide 20%, fluoroapatite 20%, silicon oxide 20%, fully mixed and stirred for 30 minutes, pH is 9, after washing, filter press, the moisture content of the straw powder and sludge mixture is reduced When it reaches 50% by weight, the mixed gas of power plant tail gas and air is used as the drying medium for drying at 200°C. The moisture content of the mixture of straw powder and sludge is reduced to 30% by weight, which is in the form of solid particles; The sludge mixture can be directly burned as an alternative energy source for coal for thermal power generation. The residue after incineration and the incineration fly ash can be used as raw cement. The residue and incineration fly ash are 10% of the total weight of the cement raw materia...
Embodiment 3
[0039] Mix straw powder and sludge with a moisture content of 78% by weight at a weight ratio of 1:12 at 25°C, add 0.4% by weight of heavy metal stabilizer for conditioning, and the composition by weight percentage is: orthophosphate 20% for calcium oxide, 30% for calcium oxide, 20% for fluorapatite, 30% for silicon oxide, fully mixed and stirred for 18 minutes, pH is 7, after washing, filter press, the moisture content of the mixture of straw powder and sludge decreases To 60% by weight, use cement plant tail gas and air to mix for drying at 220°C. The method is to pass the cement plant tail gas and air mixture into the cement feeding section to the preheater to reverse the cement plant tail gas and air mixing. After the straw and sludge are further dried, the mixed gas enters the high temperature section of the rotary kiln, and is emptied after passing through the cement production process tail gas treatment system. The moisture content of the straw powder and sludge mixture ...
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