美国佛罗里达pebble磷矿浮选流程试验

本文对美国佛罗里达pebble磷矿进行了浮选流程试验,试验采用了3种流程,即硅浮选—镁浮选流程,镁浮选—硅浮选流程和镁浮选—脱泥—硅浮选流程。试验结果表明:镁浮选—脱泥—硅浮选流程得到的精矿不但质量较好,而且有较高的P2O5回收率,其综合精矿P2O5品位为30.45%,MgO质量分数为0.98%,P2O5回收率为80.13%。镁浮选—脱泥—硅浮选流程具有流程及药剂制度简单,药剂用量少,试验指标高等优点,是美国佛罗里达pebble磷矿综合利用的有效方法。

降低某铜矿铜精矿氧化镁含量的试验研究

云南某铜矿铜精矿中镁含量偏高,通过试验研究,采用粗精矿再磨至-0.045 mm占95%,精选Ⅰ加入300 g/t CX-1的工艺流程,在保证铜回收率的前提下,铜精矿中的氧化镁含量可降至4.53%,铜精矿品位由22.8%提高到28.38%,取得了较好的降低铜精矿氧化镁含量的试验效果。

Flotation separation of brucite and calcite in dodecylamine system enhanced by regulator potassium dihydrogen phosphate

To achieve efficient flotation separation of brucite and calcite,flotation separation experiments were conducted on two minerals using dodecylamine(DDA)as the collector and potassium dihydrogen phosphate(PDP)as the regulator.The action mechanism of DDA and PDP was explored through contact angle measurement,zeta potential detection,solution chemistry calculation,FTIR analysis,and XPS detection.The flotation results showed that when DDA dosage was 35 mg/L and PDP dosage was 40 mg/L,the maximum floating difference between brucite and calcite was 79.81%,and the selectivity separation index was 6.46.The detection analysis showed that the main dissolved component HPO_(4)^(2−)of PDP is selectively strongly adsorbed on the Ca site on the surface of calcite,promoting the adsorption of the main dissolved component RNH_(3)^(+)of DDA on calcite surface,while brucite is basically not affected by PDP.Therefore,PDP is an effective regulator for the reverse flotation separation of brucite and calcite in DDA system.

Effect of serpentine and sodium hexametaphosphate on ascharite flotation

Sodium hexametaphosphate(SHMP)was used to minimize the adverse effect of serpentine for improving aschariterecovery.The effects of particle size and content of SHMP,and serpentine on ascharite flotation process were investigated throughflotation,zeta potential tests,FT-IR analysis,XPS analysis and DLVO theory.Particles interaction and mechanism of SHMP werealso discussed.It was found that aggregation between serpentine and ascharite particles easily happened,and the particle size ofserpentine had a profound impact on the ascharite recovery.In particular,the fine serpentine with size less than38μm had thegreatest contribution to the deterioration of ascharite flotation performance.After SHMP treatment,the adverse effect of serpentinewas significantly reduced.The mechanism of SHMP showed that it could alter the surface charges of serpentine and ascharite toprevent severe interparticle aggregation,which resulted in a well-dispersed pulp and benefited ascharite flotation process.Theadsorption of SHMP on serpentine was due to hydrogen bonding and chemical adsorption,resulting in the formation of complex onserpentine surface to decrease its floatability.

Effect of a cyclonic flotation column on the separation of magnesium from phosphate ore

This study was performed to investigate the effects of the cyclonic separation mechanism on the removal of magnesium from phosphate ore. An analysis of the particle-bubble collision mechanism in a cyclonic force field was used to design two different pulp circulation systems for a cyclonic-static micro-bubble flotation column （FCSMC）. Experiments comparing the two conditions were then conducted. Size analysis of the feed and separated products was conducted with a BXF cyclone size analyzer. The results show that about 34.60% of the total MgO content in the feed exists in the -10 μm fraction. This demonstrates that magnesium removal from phosphate ore has the characteristics of a micro-fine particle flotation problem. Under conditions of cyclonic circulation the MgO level of the concentrate is 1.74g, which is lower than that obtained from the column operated in direct-flow circulation by 0.34%, These results indicate that the cyclonic circulation mechanism of the FCSMC can promote removal of micro-fine particles containing magnesium. This is attributed to the function of surface flotation and to the reduction of the lower separation limit under conditions of cyclonic circulation.

Electrokinetic and Flotation Investigations of Surface Properties Modification of Magnesite and Serpentinite Using Biosurfactants and Surfactants

This paper presents some results of zeta potential measurements performed into biosurfactant adsorption onto magnesite and serpentinite surface. Zeta potential and isoelectric point measurement of magnesite and serpentinite particles before and after interaction with biosurfactant broth solution and activator （nickel（II） ion solution） were carried out. The zeta potential results show that presence of biosurfactants changes both magnesite and serpentinite surface potential by physical adsorption which increases the hydrophobicity of mineral particles. Measurements of particles zeta potential in the presence of biosurfactant broth are relevant to the minerals flotation. Hallimod flotation response of magnesite and serpentinite as a function of collector concentration was investigated. Bioflotation test results show that at the presence of broth, the flotation separation of magnesite from serpentinite is possible.