以硅酸钠为抑制剂浮选回收工业硅精炼渣中的单质硅  

Recovery of silicon from metallurgical-grade silicon-refined slag by flotation with sodium silicate as depressant

作　　者：谭宁 韩士锋 吴丹丹[2] 魏奎先[1,2] 马文会[1,2,3] Ning TAN;Shi-feng HAN;Dan-dan WU;Kui-xian WEI;Wen-hui MA(National Engineering Laboratory for Vacuum Metallurgy,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,China;Silicon Material Industry Research Institution(Innovation Center)of Yunnan Province,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院真空冶金国家工程实验室,昆明650093 [2]昆明理工大学复杂有色金属资源清洁利用国家重点实验室,昆明650093 [3]云南省硅材料产业研究中心(创新中心),昆明650093

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第5期1619-1628,共10页中国有色金属学报（英文版）

基　　金：the National Key R&D Program of China(Nos.2018YFC1901805,2018YFC1901801);the Reserve Talents of Young and Middle-aged Academic and Technical Leaders in Yunnan Province,China(No.2018HB009);the Program for Innovative Research Team in University of the Ministry of Education of China(No.IRT-17R48);the Major Project of Science and Technology Department of Yunnan Province,China(No.2019ZE007).

摘　　要：提出一种以硅酸钠(SS)为抑制剂从工业硅精炼渣(硅酸盐)中浮选回收单质硅的新方法。通过溶液化学、接触角和zeta电位测试,研究SS与硅酸盐的相互作用机理。研究发现,添加SS后,回收的硅含量从(72.12±5.08)%(质量分数)提高至(81.14±1.77)%(质量分数)。浮选过程中,SS水解成亲水性较强的H_(2)SiO_(3)和HSiO_(3)^(−),与硅酸盐发生物理/化学吸附,导致硅酸盐表面接触角从6.62°降至0°,从而降低了硅酸盐的可浮性。A flotation recovery method of silicon from metallurgical-grade silicon-refined slag(silicate)using sodium silicate(SS)as the depressant was proposed.The solution chemistry,contact angle,and zeta potential measurements were used to understand the interaction mechanisms of SS on the silicate.With SS addition,the content of recovered silicon increased from(72.12±5.08)wt.%to(81.14±1.77)wt.%.During the flotation process,SS was hydrolyzed into strongly hydrophilic H_(2)SiO_(3)and HSiO_(3)^(−),which could be physically or chemically adsorbed with silicate.This adsorption allowed the contact angle of the silicate surface to decrease from 6.62°to 0°,indicating the decreasing floatability of the silicate.

关 键 词：工业硅精炼渣 浮选 硅酸钠 抑制剂 

分 类 号：X705[环境科学与工程—环境工程] TQ127.2[化学工程—无机化工]