四种有机抑制剂对倍半氧化物的抑制性能

Depressing Performance of Four Organic Depressants on Sesquioxide

采用一粗一精正浮选工艺,研究了小分子有机酸(ST-1)、阴离子淀粉(AS)、萘磺酸盐甲醛缩合物(NFSC)、羧甲基纤维素钠(CMC)4种有机抑制剂对胶磷矿中类型为水云母、褐铁矿的倍半氧化物的抑制性能.结果表明,NFSC用量为0.35 kg/t时,磷精矿品位达到31.36%,回收率在80.22%,倍半氧化物的质量分数降低到3.48%;CMC用量为0.20 kg/t时,磷精矿中倍半氧化物的质量分数可以降至3.20%,但磷精矿回收率仅为26.24%;当分别使用AS、ST-1作为抑制剂时,精矿中倍半氧化物的质量分数变化都不明显.因此,NFSC在分离倍半氧化物脉石与磷矿物时抑制性能最好;CMC对倍半氧化物脉石有很强的抑制性,但选择性差;ST-1、AS作为抑制剂对倍伴氧化物的抑制作用较弱.

The performance of four organic depressants, low-molecule organic acid （ST-l） , anionic starch （AS）, naphthalene sulfonate formaldehyde condensate （NFSC） and sodium carboxymethyl cellulose （CMC） were explored on sesquioxide （hydromica and pyrite） in a collophanite by using roughing-cleaning direct flotation method. The results show that the grade and recovery of phosphate concentrate are 31.36% and 80.22% respectively, and the mass fraction of sesquioxide reduces to 3.48% at 0.35 kg/t of NFSC. The recovery of phosphate concentrate is only 26.24%, and the mass fraction of sesquioxide reduces to 3.20% at 0.20 kg/t of CMC. The AS and ST-1 have not significant effect on the mass fraction of sesquioxide in phosphate concentrate. In conclusion, NFSC has the best depressing performance in separating collophanite and sesquioxide gangue mineral. CMC has a strong depressing on sesquioxide gangue mineral, but it shows poor selectivity. ST-1 and AS have poor depressing in sesquioxide gangue mineral.