白云石对菱镁矿浮选行为的影响

Influence of Dolomite on Flotation Behavior of Magnesite

以油酸钠(NaOL)为捕收剂,六偏磷酸钠为抑制剂研究菱镁矿和白云石浮选行为,并依据动电位、吸附试验和扫描电镜测试结果,探讨了菱镁矿与白云石人工混合矿体系中Ca^(2+)对菱镁矿浮选的影响机理.浮选试验结果表明,六偏磷酸钠对菱镁矿和白云石单矿物有良好的选择抑制作用;但对二者的人工混合矿进行浮选时,两种矿物均受到六偏磷酸钠的抑制,无法实现分离.吸附试验和扫描电镜测试结果表明,在浮选过程中白云石溶解出的Ca^(2+)吸附在菱镁矿表面.动电位测试表明,由于Ca^(2+)的吸附导致菱镁矿与白云石的表面性质趋同,严重影响这两种矿物的浮选分离.

The flotation behaviors of magnesite and dolomite were studied with sodium oleate （NaOL） as collector and sodium hexametaphosphate （SHMP） as depressant and the effect of Ca2＋ appeared in the flotation pulp of artificial mixed ore containing dolomite and magnesite on flotation behavior of magnesite was explored by means of zeta potential measurements, adsorption tests and SEM-EDS analysis. Flotation results show that SHMP is a good selective depressant in single mineral flotation of magnesite and dolomite, while in the flotation separation of mixed mineral, magnesite and dolomite were both depressed by SHMP, flotation separation of two minerals can not be achieved. Adsorption tests and SEM-EDS analysis show that Ca2＋ dissolved from dolomite adsorbs on magnesite surface during flotation process. Zeta potential measurements show that the adsorption of Ca2＋ on magnesite surface makes the two minerals surface property similar, which seriously affects the flotation separation of magnesite and dolomite.