Negative effect of dissolved organic compounds on settling behavior of synthetic monominerals in red mud  

作　　者：王梦 胡慧萍 刘锦伟 陈启元 

机构地区：[1]School of Chemistry and Chemical Engineering, Central South University

出　　处：《Journal of Central South University》2016年第7期1591-1602,共12页中南大学学报（英文版）

基　　金：Project(51174231)supported by the National Natural Science Foundation of China

摘　　要：Hydration grossular and hematite monominerals were synthesized. The effects of dissolved organic compounds(including sodium formate, sodium acetate, sodium oxalate, sodium salicylate or disodium phthalate) on the settling performance of hydration grossular or hematite slurries were studied. The settling of the slurries was also investigated with the addition of sodium polyacrylate(PAAS) or hydroxamated polyacrylamide flocculant(HCPAM). The adsorption mechanism of organic compounds on monominerals surfaces was studied by FT-IR and XPS, respectively. A deterioration in settling is observed in order of disodium phthalate>sodium salicylate>sodium oxalate>sodium formate(or sodium acetate). Moreover, PAAS can efficiently eliminate the negative effects of organic compounds on the settling performance of the hydration grossular slurry. HCPAM can efficiently eliminate the negative effects of sodium formate, sodium acetate and sodium oxalate on the settling performance of the hematite slurry, but it only partially improves the settling performance of hematite slurry containing sodium salicylate or disodium phthalate. FT-IR and XPS results show that organic compounds are physically adsorbed on hydration grossular surface, and chemisorptions of organic compounds occur on hematite surface with a bidentate chelating complex.Hydration grossular and hematite monominerals were synthesized. The effects of dissolved organic compounds（including sodium formate, sodium acetate, sodium oxalate, sodium salicylate or disodium phthalate） on the settling performance of hydration grossular or hematite slurries were studied. The settling of the slurries was also investigated with the addition of sodium polyacrylate（PAAS） or hydroxamated polyacrylamide flocculant（HCPAM）. The adsorption mechanism of organic compounds on monominerals surfaces was studied by FT-IR and XPS, respectively. A deterioration in settling is observed in order of disodium phthalate〉sodium salicylate〉sodium oxalate〉sodium formate（or sodium acetate）. Moreover, PAAS can efficiently eliminate the negative effects of organic compounds on the settling performance of the hydration grossular slurry. HCPAM can efficiently eliminate the negative effects of sodium formate, sodium acetate and sodium oxalate on the settling performance of the hematite slurry, but it only partially improves the settling performance of hematite slurry containing sodium salicylate or disodium phthalate. FT-IR and XPS results show that organic compounds are physically adsorbed on hydration grossular surface, and chemisorptions of organic compounds occur on hematite surface with a bidentate chelating complex.

关 键 词：hydration grossular HEMATITE dissolved organic compounds settling performance simulated bayer digestion 

分 类 号：TD982[矿业工程—选矿]