Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for fixing arsenic in tin tailings by using cement
The invention relates to a method for fixing arsenic in tin tailings by using cement, and belongs to the technical field of hydrometallurgy. The preparation method comprises the following steps: respectively grinding, sieving and drying tin tailings and cement to obtain tin tailing powder and cement powder; uniformly mixing the tin tailing powder and the cement powder to obtain a mixture A; adding water into the mixture A, and uniformly mixing to obtain slurry B; and injecting the slurry B into a mold, sealing and standing for 24-48 hours at room temperature, demolding, and curing for more than 3 days under the conditions of room temperature and humidity of 90-95% to obtain an arsenic-containing solid. In the process that cement is excited by water to form a three-dimensional network structure, formation of C-S-H gel is facilitated, gaps among hydration products are filled with the C-S-H gel, the compactness of the structure is improved, As elements enter the main body structure of the C-S-H gel to fix the As elements, and the compressive strength is improved; the arsenate-containing ettringite has expansibility, so that the porosity of a coating body can be reduced, and the compactness of the structure is improved.
本发明涉及一种利用水泥固定锡尾矿中砷的方法，属于湿法冶金技术领域。本发明将锡尾矿、水泥分别进行研磨、过筛和干燥处理得到锡尾矿粉和水泥粉；锡尾矿粉和水泥粉均匀混合得到混合物A；水加入到混合物A中混合均匀得到浆料B；将浆料B注入模具中并在室温下密封静置24～48h，脱模后置于室温、湿度为90～95％条件下养护3d以上得到含砷固体。本发明水泥在水激发形成三维网状结构过程中，有利于形成C‑S‑H凝胶，C‑S‑H凝胶被填充在水化产物之间的空隙中，提高结构的致密性，As元素进入C‑S‑H凝胶主体结构中以固定As元素，提高抗压强度；含砷酸根的钙矾石具有膨胀性，可以减少包覆体的孔隙率，提高结构的致密性。
Method for fixing arsenic in tin tailings by using cement
The invention relates to a method for fixing arsenic in tin tailings by using cement, and belongs to the technical field of hydrometallurgy. The preparation method comprises the following steps: respectively grinding, sieving and drying tin tailings and cement to obtain tin tailing powder and cement powder; uniformly mixing the tin tailing powder and the cement powder to obtain a mixture A; adding water into the mixture A, and uniformly mixing to obtain slurry B; and injecting the slurry B into a mold, sealing and standing for 24-48 hours at room temperature, demolding, and curing for more than 3 days under the conditions of room temperature and humidity of 90-95% to obtain an arsenic-containing solid. In the process that cement is excited by water to form a three-dimensional network structure, formation of C-S-H gel is facilitated, gaps among hydration products are filled with the C-S-H gel, the compactness of the structure is improved, As elements enter the main body structure of the C-S-H gel to fix the As elements, and the compressive strength is improved; the arsenate-containing ettringite has expansibility, so that the porosity of a coating body can be reduced, and the compactness of the structure is improved.
本发明涉及一种利用水泥固定锡尾矿中砷的方法，属于湿法冶金技术领域。本发明将锡尾矿、水泥分别进行研磨、过筛和干燥处理得到锡尾矿粉和水泥粉；锡尾矿粉和水泥粉均匀混合得到混合物A；水加入到混合物A中混合均匀得到浆料B；将浆料B注入模具中并在室温下密封静置24～48h，脱模后置于室温、湿度为90～95％条件下养护3d以上得到含砷固体。本发明水泥在水激发形成三维网状结构过程中，有利于形成C‑S‑H凝胶，C‑S‑H凝胶被填充在水化产物之间的空隙中，提高结构的致密性，As元素进入C‑S‑H凝胶主体结构中以固定As元素，提高抗压强度；含砷酸根的钙矾石具有膨胀性，可以减少包覆体的孔隙率，提高结构的致密性。
Method for fixing arsenic in tin tailings by using cement
一种利用水泥固定锡尾矿中砷的方法
ZHANG ZHENGFU (Autor:in) / LIU YANG (Autor:in) / YANG HUI (Autor:in) / ZHOU XIAN (Autor:in) / WANG JINGSONG (Autor:in)
23.09.2022
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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