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A platform for research: civil engineering, architecture and urbanism
Method for preparing baking-free bricks by washing and desalting fly ash
The invention provides a method for preparing baking-free bricks by washing and desalting fly ash. The method comprises the following steps: pulping fly ash; dehydrating the fly ash slurry; purifying and desalting water; mixing cement auxiliary materials; curing and molding. A chelating agent and a dioxin adsorbent are added into fly ash slurry to stabilize heavy metals in fly ash and adsorb dioxin, suction filtration and dehydration are carried out to generate a filter cake, the filter cake and cement auxiliary materials are compounded and mixed, water is added and stirred, finally the mixture is added into a mold for curing and molding, and finally the fly ash cement mixed bricks are obtained. The medicament stabilizes heavy metals and dioxin in the fly ash, so that the heavy metals and dioxin are not easy to leach; salt in the fly ash is removed after suction filtration and dehydration; water purification and MVR evaporation are carried out on the suction filtration wastewater, the fly ash filter cake is fed into a mixing mill, the evaporation condensate water is returned into a pulping tank, and crystalline salt is collected and converted into resources; the cement and auxiliary materials are added to further stabilize heavy metals, meanwhile, the strength of the bricks is improved, the environmental risk of fly ash landfill is reduced, the product can be recycled, and wastes are turned into resources.
本发明提出的一种飞灰经水洗脱盐后制免烧砖的方法，步骤如下：飞灰制浆；飞灰浆液脱水；水质净化及脱盐；水泥辅料混合；养护成型。本发明利用螯合剂及二噁英吸附剂添加至飞灰浆液中稳定飞灰中的重金属，并吸附二噁英，然后经抽滤脱水后产生滤饼与水泥辅料进行配伍混合并加水搅拌，最终浸入模具中养护成型，得到飞灰水泥混合砖块。药剂稳定了飞灰中重金属及二噁英，使之不易浸出；抽滤脱水后飞灰中盐分被脱除；抽滤废水经水质净化与MVR蒸发工段，飞灰滤饼送入混炼机，蒸发冷凝水回用制浆罐，结晶盐收集后进行资源化利用；水泥及辅助材料的加入进一步稳定重金属，同时可提高砖块强度，减小了飞灰填埋的环境风险，产品可作资源化利用，变害为宝。
Method for preparing baking-free bricks by washing and desalting fly ash
The invention provides a method for preparing baking-free bricks by washing and desalting fly ash. The method comprises the following steps: pulping fly ash; dehydrating the fly ash slurry; purifying and desalting water; mixing cement auxiliary materials; curing and molding. A chelating agent and a dioxin adsorbent are added into fly ash slurry to stabilize heavy metals in fly ash and adsorb dioxin, suction filtration and dehydration are carried out to generate a filter cake, the filter cake and cement auxiliary materials are compounded and mixed, water is added and stirred, finally the mixture is added into a mold for curing and molding, and finally the fly ash cement mixed bricks are obtained. The medicament stabilizes heavy metals and dioxin in the fly ash, so that the heavy metals and dioxin are not easy to leach; salt in the fly ash is removed after suction filtration and dehydration; water purification and MVR evaporation are carried out on the suction filtration wastewater, the fly ash filter cake is fed into a mixing mill, the evaporation condensate water is returned into a pulping tank, and crystalline salt is collected and converted into resources; the cement and auxiliary materials are added to further stabilize heavy metals, meanwhile, the strength of the bricks is improved, the environmental risk of fly ash landfill is reduced, the product can be recycled, and wastes are turned into resources.
本发明提出的一种飞灰经水洗脱盐后制免烧砖的方法，步骤如下：飞灰制浆；飞灰浆液脱水；水质净化及脱盐；水泥辅料混合；养护成型。本发明利用螯合剂及二噁英吸附剂添加至飞灰浆液中稳定飞灰中的重金属，并吸附二噁英，然后经抽滤脱水后产生滤饼与水泥辅料进行配伍混合并加水搅拌，最终浸入模具中养护成型，得到飞灰水泥混合砖块。药剂稳定了飞灰中重金属及二噁英，使之不易浸出；抽滤脱水后飞灰中盐分被脱除；抽滤废水经水质净化与MVR蒸发工段，飞灰滤饼送入混炼机，蒸发冷凝水回用制浆罐，结晶盐收集后进行资源化利用；水泥及辅助材料的加入进一步稳定重金属，同时可提高砖块强度，减小了飞灰填埋的环境风险，产品可作资源化利用，变害为宝。
Method for preparing baking-free bricks by washing and desalting fly ash
一种飞灰水洗脱盐后制免烧砖的方法
LONG JISHENG (author) / ZHANG YIYANG (author) / FENG LINLIN (author) / LAO YUNFENG (author) / LIU LU (author) / HU FALI (author) / BAI LI (author) / QU ZHAOZHOU (author) / SUN ZHONGTAO (author) / MAO MENGMEI (author)
2021-04-16
Patent
Electronic Resource
Chinese
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