寡养单胞属菌株USTB-2对赤铁矿的捕收效果及机理

对从司家营铁矿场土壤中筛选出来的非致病性寡养单胞属菌株USTB-2作为赤铁矿的捕收剂进行了研究.Zeta电位测试知该菌在较大pH范围内带负电.经菌体USTB-2作用后，赤铁矿接触角增加了3395°，表面疏水性得到了极大的提高.在pH为6，菌体添加量为60g/t时，赤铁矿浮选回收率可达到7631%.机理研究表明，菌体USTB-2表面具有的烃类物质、羧基、磷酸基团使其具有类似脂肪酸类捕收剂的特性，通过“桥联”作用促进赤铁矿颗粒之间形成絮团；这证实寡养单胞属细菌USTB-2可以充当赤铁矿捕收剂.

Effect and Mechanism of Stenotrophomonas Strain USTB 2 as Collector for Hematite

A non pathogenic stenotrophomonas strain USTB 2 was screened out from the soil of Sijiaying iron ore plant and studied as collector for hematite by flotation tests. Zeta potential measurement results showed that the bacteria was negatively charged in the large range of pH. The contact angle of hematite increased by 3395° and surface hydrophobicity of hematite was greatly improved after interaction with USTB 2 strain. The flotation recovery of hematite could reach to 7631% at pH=6 and the bacterial cells addition amount of 60g/t. The mechanism study results showed that the outer surface of USTB 2 cell has hydrocarbon groups， carboxyl groups and phosphoric acid groups， so the bacteria has similar characteristics of fatty acid collector， and can form the flocs between hematite hematite particles by the “bridge” action. This is confirmed that the stenotrophomonas strain USTB 2 can work as collector for hematite.