含选矿捕收剂的铝酸钠溶液红外光谱

微量长烃链脂肪酸型捕收剂吸附在铝土矿选精矿上，随选精矿进入拜耳法流程，使拜耳法重要中间物料铝酸钠溶液中有机物成分发生变化.本文采用膜加水的制样方法，测定长烃链脂肪酸型捕收剂存在下的铝酸钠溶液红外光谱，研究了其对铝酸钠溶液结构的影响.结果表明：膜加水制样方法测定铝酸钠溶液红外光谱，特征峰明显，能满足试验的要求;具有羧基官能团的长烃链脂肪酸型捕收剂的存在使苛性比α_k=3.0、浓度ρ_Na2O=220 g•L^-1和α_k=1.56、ρ_Na2O=160 g•L^-1的铝酸钠溶液Al—O—Al键随捕收剂含量的增加而增多，而Al（OH）^-₄键峰强基本不变;同时发现α_k=1.56、ρ_Na2O=160 g•L^-1的铝酸钠溶液Al—O—Al振动带和Al—OH反对称弯曲振动带峰强高于α_k=3.0、ρ_Na2O=220 g•L^-1的铝酸钠溶液的峰强.

Infrared spectrum of aluminate solutions with collector

Organic constituents in the sodium aluminate solution，which is the important intermediate material of the Bayer process,change evidently because of trace amount long fatty acid collector adsorbed onto bauxite concentrates entering into the Bayer process.The effects of long fatty acid collector on the structure of sodium aluminate solution was studied with plastics sheets attached water as the background of infrared spectrum.The results showed that the characteristic peaks of sodium aluminate solution was distinct.The Al—O—Al bond peak intensity increased and the Al(OH)^-₄ bond peak intensity was constant with increasing content of the collector PS.The peak intensity of Al—O—Al vibration and AlOH antisymmetric vibration was stronger in α_k=1.56，ρ_Na2O=160 g•L^-1 solution than that in α_k=3.0，ρ_Na2O=220 g•L^-1 solution.