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Method for fixing arsenic by using blast furnace slag-metakaolin-based geopolymer
The invention designs a method for fixing arsenic by using blast furnace slag-metakaolin-based geopolymer, and belongs to the technical field of solid waste heavy metal arsenic pollution treatment. The method comprises the following steps: uniformly mixing blast furnace slag powder and metakaolin powder to obtain a blast furnace slag-metakaolin mixture, dissolving sodium hydroxide into a sodium silicate solution, and standing for 20-30 hours to obtain an alkali activator; adding the alkali activator into the blast furnace slag-metakaolin mixture, then adding arsenopyrite, and uniformly mixing to obtain slurry; and injecting the slurry into a mold, sealing and standing at room temperature for 24-35 hours, demolding, and curing at room temperature under the humidity of 85-95% for 7-28 days or more to obtain the arsenic-containing building material. In the process that the blast furnace slag-metakaolin-based geopolymer is excited by an alkali activator to form a three-dimensional network structure, As elements are embedded into silicon-aluminum bonds to form a part of a geopolymer structure, so that the three-dimensional network structure is more stable, ettringite is formed in the reaction process, the strength of the geopolymer is improved, and the method has very high compressive strength and extremely low arsenic leaching rate.
本发明设计一种利用高炉矿渣‑偏高岭土基地聚物固砷的方法，属于固体废物重金属砷污染治理技术领域。本发明将高炉矿渣粉和偏高岭土粉混合均匀得到高炉矿渣‑偏高岭土混合物，将氢氧化钠溶解至硅酸钠溶液中，静置20～30h得到碱激活剂；将碱激活剂加入到高炉矿渣‑偏高岭土混合物中，再加入毒砂，混合均匀得到浆料；将浆料注入模具中并在室温下密封静置24～35h，脱模后置于室温、湿度为85～95％条件下养护7～28d以上得到含砷建筑材料。本发明高炉矿渣‑偏高岭土基地聚物在碱激活剂激发形成三维网状结构过程中，As元素嵌入硅铝键中，形成地聚物结构的一部分，使三维网状结构更稳固，在反应的过程中有钙矾石形成，增加地聚物强度，具有很高的抗压强度和极低的砷浸出率。
Method for fixing arsenic by using blast furnace slag-metakaolin-based geopolymer
The invention designs a method for fixing arsenic by using blast furnace slag-metakaolin-based geopolymer, and belongs to the technical field of solid waste heavy metal arsenic pollution treatment. The method comprises the following steps: uniformly mixing blast furnace slag powder and metakaolin powder to obtain a blast furnace slag-metakaolin mixture, dissolving sodium hydroxide into a sodium silicate solution, and standing for 20-30 hours to obtain an alkali activator; adding the alkali activator into the blast furnace slag-metakaolin mixture, then adding arsenopyrite, and uniformly mixing to obtain slurry; and injecting the slurry into a mold, sealing and standing at room temperature for 24-35 hours, demolding, and curing at room temperature under the humidity of 85-95% for 7-28 days or more to obtain the arsenic-containing building material. In the process that the blast furnace slag-metakaolin-based geopolymer is excited by an alkali activator to form a three-dimensional network structure, As elements are embedded into silicon-aluminum bonds to form a part of a geopolymer structure, so that the three-dimensional network structure is more stable, ettringite is formed in the reaction process, the strength of the geopolymer is improved, and the method has very high compressive strength and extremely low arsenic leaching rate.
本发明设计一种利用高炉矿渣‑偏高岭土基地聚物固砷的方法，属于固体废物重金属砷污染治理技术领域。本发明将高炉矿渣粉和偏高岭土粉混合均匀得到高炉矿渣‑偏高岭土混合物，将氢氧化钠溶解至硅酸钠溶液中，静置20～30h得到碱激活剂；将碱激活剂加入到高炉矿渣‑偏高岭土混合物中，再加入毒砂，混合均匀得到浆料；将浆料注入模具中并在室温下密封静置24～35h，脱模后置于室温、湿度为85～95％条件下养护7～28d以上得到含砷建筑材料。本发明高炉矿渣‑偏高岭土基地聚物在碱激活剂激发形成三维网状结构过程中，As元素嵌入硅铝键中，形成地聚物结构的一部分，使三维网状结构更稳固，在反应的过程中有钙矾石形成，增加地聚物强度，具有很高的抗压强度和极低的砷浸出率。
Method for fixing arsenic by using blast furnace slag-metakaolin-based geopolymer
一种利用高炉矿渣-偏高岭土基地聚物固砷的方法
ZHANG ZHENGFU (author) / LIU YANG (author) / YANG HUI (author) / ZHOU XIAN (author) / WANG JINGSONG (author)
2021-12-24
Patent
Electronic Resource
Chinese
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