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Process method for converting dry-method desulfurized fly ash into desulfurized gypsum
The invention belongs to the technical field of solid waste treatment, and particularly relates to a process method for converting dry-method desulfurized fly ash into desulfurized gypsum. The processmethod comprises the following steps: step 1, adding water and dry-method desulfurized fly ash into an oxidation tower, and stirring to obtain a dry-method desulfurized fly ash solution; step 2, introducing the dry-method desulfurized fly ash solution into sintering machine flue gas under a stirring condition for reaction; 3, after the reaction is completed, carrying out solid-liquid separation on the solution; step 4, returning the solution prepared by solid-liquid separation to an oxidation tower, and feeding a separated solid into a distillation device; step 5, carrying out solid-liquid separation in a distillation device, returning distilled water vapor to the oxidation tower, and taking the left solid as desulfurized gypsum; a precipitation method can be adopted to remove calcium chloride and calcium nitrite in the solution prepared through solid-liquid separation further. According to the method, the temperature of the flue gas of a sintering machine head and the sulfur dioxidemedium in the flue gas are fully utilized to realize conversion of calcium sulfite in the dry-method desulfurization fly ash, and meanwhile, the problem of secondary pollution caused by calcium chloride and calcium nitrite is solved.
本发明属于固废处理技术领域，特别涉及一种干法脱硫灰转化脱硫石膏的工艺方法包括以下步骤：步骤1，将水和干法脱硫灰加入氧化塔，搅拌成干法脱硫灰溶液；步骤2，所述干法脱硫灰溶液在搅拌条件下通入烧结机烟气进行反应；步骤3，反应完全后，将溶液进行固液分离；步骤4，固液分离制得到液体返回氧化塔，分离出的固体进入蒸馏装置；步骤5，在蒸馏装置进行固液分离，蒸馏出的水蒸气返回氧化塔，留下的固体作为脱硫石膏；固液分离制得到液体还可进一步通过沉淀法去除氯化钙、亚硝酸钙；本发明充分利用的烧结机机头的烟气的温度和烟气中的二氧化硫的介质实现了干法脱硫灰中亚硫酸钙转化，同时解决了氯化钙、亚硝酸钙带来二次污染的问题。
Process method for converting dry-method desulfurized fly ash into desulfurized gypsum
The invention belongs to the technical field of solid waste treatment, and particularly relates to a process method for converting dry-method desulfurized fly ash into desulfurized gypsum. The processmethod comprises the following steps: step 1, adding water and dry-method desulfurized fly ash into an oxidation tower, and stirring to obtain a dry-method desulfurized fly ash solution; step 2, introducing the dry-method desulfurized fly ash solution into sintering machine flue gas under a stirring condition for reaction; 3, after the reaction is completed, carrying out solid-liquid separation on the solution; step 4, returning the solution prepared by solid-liquid separation to an oxidation tower, and feeding a separated solid into a distillation device; step 5, carrying out solid-liquid separation in a distillation device, returning distilled water vapor to the oxidation tower, and taking the left solid as desulfurized gypsum; a precipitation method can be adopted to remove calcium chloride and calcium nitrite in the solution prepared through solid-liquid separation further. According to the method, the temperature of the flue gas of a sintering machine head and the sulfur dioxidemedium in the flue gas are fully utilized to realize conversion of calcium sulfite in the dry-method desulfurization fly ash, and meanwhile, the problem of secondary pollution caused by calcium chloride and calcium nitrite is solved.
本发明属于固废处理技术领域，特别涉及一种干法脱硫灰转化脱硫石膏的工艺方法包括以下步骤：步骤1，将水和干法脱硫灰加入氧化塔，搅拌成干法脱硫灰溶液；步骤2，所述干法脱硫灰溶液在搅拌条件下通入烧结机烟气进行反应；步骤3，反应完全后，将溶液进行固液分离；步骤4，固液分离制得到液体返回氧化塔，分离出的固体进入蒸馏装置；步骤5，在蒸馏装置进行固液分离，蒸馏出的水蒸气返回氧化塔，留下的固体作为脱硫石膏；固液分离制得到液体还可进一步通过沉淀法去除氯化钙、亚硝酸钙；本发明充分利用的烧结机机头的烟气的温度和烟气中的二氧化硫的介质实现了干法脱硫灰中亚硫酸钙转化，同时解决了氯化钙、亚硝酸钙带来二次污染的问题。
Process method for converting dry-method desulfurized fly ash into desulfurized gypsum
一种干法脱硫灰转化脱硫石膏的工艺方法
HAN JIAYOU (author) / HONG JIANGUO (author)
2020-06-30
Patent
Electronic Resource
Chinese
Method for preparing desulfurized gypsum from dry desulfurized ash
| European Patent Office | 2020