改性淀粉抑制赤铁矿反浮选石英的作用机理研究

通过矿物浮选试验、动电位测定以及吸附量测试,考察了4种淀粉抑制剂对赤铁矿和石英浮选性能的影响,并探讨了其作用机理。在碱性条件下,改性淀粉抑制剂对赤铁矿抑制效果明显,且以改性玉米淀粉效果最佳,改性磷酸酯淀粉、改性羧甲基淀粉的抑制效果次之,而普通淀粉抑制作用一般。同时4种淀粉抑制剂对主要脉石矿物石英的抑制效果均不明显。pH=10~12.5条件下,改性玉米淀粉因其羟基氧和裸露在赤铁矿表面的铁元素发生了化学键合,因而选择性抑制能力最佳。分子动力学模拟表明,改性玉米淀粉片段与赤铁矿作用更为紧密,验证了改性淀粉能更好地抑制赤铁矿。     

某铜铅锌矿石浮选试验研究

根据矿石性质,铜铅混合浮选采用XY - 09型抑制剂和XYB - 09型捕收剂,强化抑制闪锌矿,基本解决次生铜活化闪锌矿问题,为保证铜铅混合精矿有效分离、锌精矿质量及回收率创造了有利条件.     

梅山硫精矿工艺矿物学及降镁工艺研究

为提高梅山硫精矿品位并将其中的MgO降到0．3％以下，以满足用硫精矿烧渣制取高纯氧化铁红的需要，对梅山硫精矿进行了工艺矿物学研究，查明了MgO的赋存状态和各杂质元索在各矿物中的分布情况。在此基础上，设计了产出2种硫精矿产品的技术路线，埘原硫精矿采用简单易行的一粗一精无尾矿浮选流程和含镁矿物的有效抑制剂WHL—Y1，获得的高硫精矿产品含硫48．06％、含MgO 0．18％，达到了试验目标，而低硫精矿产品含硫25．20％，仍符合制酸要求。     

煤泥浮选中抑制剂的应用研究

针对选煤厂煤泥浮选精煤灰分高的问题，通过一系列浮选试验，研究了浮选流程、抑制剂等工艺条件对浮选精煤灰分的影响，提出了改善浮选效果、降低浮选精煤灰份的可行性方案。采用粗选、一次精选的浮选流程，在精选过程中添加抑制剂(羧甲基纤维素)，可使精煤灰分从12．10％降低到9．87％，明显改善和提高了浮选效果。     

A novel depressor useful for flotation separation of diaspore and kaolinite

The floatation of the minerals diaspore and kaolinite was investigated using dodecylamine as the collector.Separating diaspore and kaolinite in a neutral pH pulp is difficult since they then have similar floatability.A depressor consisting of an AlCl3/Na2SiO3 mixture is demonstrated to solve this problem.Diaspore sinking may be seen when the ratio of AlCl3 to Na2SiO3 is 3.1.We refer to this mixture as ATNO.The influence of Al/Si ratio in the feedstock and the grain size of fed minerals on separation was examined.An Al/Si ratio in the concentrate greater than 11 may be obtained when the Al/Si ratio of the feed is between 2.53 and 4.96.However,the grain size of the diaspore greatly influences the concentrate grade.Finer grain size of the diaspore (＜40 μm)in pulp makes the flotation separation less than ideal,no matter what the kaolinite grain size.     

油溶性原油降黏剂BEM-JN及其应用

根据仪长线管输混合油的胶质沥青质含量和蜡烃碳数分布,合成了颗粒状油溶性原油降黏剂BEM-JN。该剂由醇烃基碳数为16~22的丙烯酸高级醇酯、顺丁烯二酸酐、丙烯酰胺三元共聚物、硬脂酸和二乙烯三胺的酰胺及多种表面活性剂组成。简介了合成方法。在室内测试中,加量60 mg/L的BEM-JN使混合原油凝点由4℃降至-10℃,低温(20,15,10,7℃)黏度大幅降低。在管径559×7.9(mm)、长87 km的仪长线大冶~武汉支线上进行了为期5天的现场测试,地温15℃,在大冶起点站加入60 mg/L BEM-JN后,混合原油的凝点和黏度(平均值)由9℃和1059.6 mPa.s降至-4℃和388.5 mPa.s,到达武汉终点站后为-9.5℃和428.0 mPa.s,停输33小时后再启输,到达终点站后为-9~-10℃和411.6~443.4 mPa.s。表3参3。     

T803B在油品中的使用性能

考查了Ｔ８０３Ｂ在大庆原油生产的中性油中的降凝效果，在多级发动机中与复剂、ＯＣＰ等的配伍性以及与其它降凝剂的复合性能。     

铜钼矿的浮选工艺和浮选药剂研究进展

就铜钼矿的几种浮选方法进行了综述,介绍了铜钼矿浮选捕收剂及抑制剂的研究进展,指出研究开发新型高效捕收剂及铜钼分离抑制剂是综合回收铜钼矿资源的关键。     

Mechanism of separating pyrite and dolomite by flotation

To study the mechanism of separating pyrite and dolomite by flotation, the acting mechanisms of WHL depressor and both the minerals were studied by means of thermogravimetric and differential thermal analysis （TG-DTA）, Fourier transform infrareddiffuse reflection spectroscopy （PTIR-DRS）, and X-ray photoelectron spectroscopy （XPS）. The results indicated that WHL formed metal salts with metal ions dissolved in water from dolomite and pyrite, which then deposited on their surfaces. Both of the minerals could be depressed by WHL. In the process of flotation, sulfur was created besides the WIlL being absorbed on the surface of the sulfur concentrate, and its recovery rate was slightly affected.     

浮选药剂的应用现状及发展趋势

介绍了硫化矿捕收剂、氧化矿捕收剂、硫化矿分选抑制剂、起泡剂的国内外应用现状、发展趋势,并进行了评述。