A depressant for marmatite flotation:Synthesis,characterisation and floatation performance

This study synthesised a zincic salt(ZS)as a depressant for marmatite-galena separation.The effect of ZS on the flotation of marmatite and galena was investigated through micro-flotation tests.88.89%of the galena was recovered and 83.39%of the marmatite was depressed with ZS dosage of 750 mg·L^(−1)at pH=4.The depression mechanism of ZS on marmatite was investigated by a variety of techniques,including adsorption measurements,Fourier transform infrared(FTIR),X-ray photoelectron spectroscopic(XPS)analysis,and time of flight secondary ion mass spectrometry(ToF-SIMS).Results of adsorption tests and FTIR reveal that ZS adsorbed on marmatite surface and impeded the subsequent adsorption of butyl xanthate(BX).The results of XPS and ToF-SIMS indicate that the ZnO_(2)^(3-)released by ZS could be chemisorbed on the marmatite surface and depress marmatite flotation.

Effect of 2-aminothiophenol on the separation of jamesonite and marmatite

The minerals jamesonite and marmatite have similar surface properties.Separating them using a flotation method is inefficient.For separation of lead and zinc the lead mineral is generally floated preferentially to the zinc mineral,which appears in the sinks.In this study a new of collector,2-aminothiophenol,is introduced that can float a zinc mineral,as a product entrapped in foam,preferentially.Single mineral flotation tests revealed that 2-aminothiophenol has good selectivity for flotation of marmatite. An artificial mixture of minerals used in a flotation test showed that 2-aminothiophenol can effectively separate marmatite from jamesonite.A product assaying at 45.06%Zn and 4.06%Pb was produced.FTIR spectra were employed to probe the adsorption mechanism of 2-aminothiophenol onto marmatite.The results indicate that adsorption of 2-aminothiophenol onto jamesonite and marmatite were,respectively,physical adsorption and chemical adsorption.This agrees with the flotation results.

Electrochemical flotation separation of marmatite from pyrrhotite in the presence of copper ion

In the presence of Cu 2+ ion, and pH range of 2.0 to 12.0, the floatability of pyrrhotite and marmatite is well, so marmatite can not be separated from pyrrhotite. The technique of electrochemical flotation was used to separate marmatite from pyrrhotite in the presence of Cu 2+ . Pyrrhotite can be depressed and marmatite be floated through controlling the potential of flotation. Marmatite can be separated from pyrrhotite in the pulp potential range of -0.25 V to 0 V (vs SHE) at pH11.2 solution. The chronopotentiometry results of pyrrhotite and marmatite in the presence of Cu 2+ and butyl xanthate showed that, when the pH is 11.2 and the pulp potential is -0.2 V (vs SHE), the CuX 2 is adsorbed on marmatite surface, and the dixanthogen adsorbed on pyrrhotite surface is reduced.

Kinetics of indium dissolution from marmatite with high indium content in pressure acid leaching

The kinetics of oxygen pressure acid leaching marmatite with high indium content was studied. The effects of particle size, agitation rate, temperature, HSOconcentration, and oxygen partial pressure on leaching rate of indium were investigated. The results show that when the agitation rate is above 600 r-min, its influence on indium leaching rate is insignificant. It is determined that the leaching rates increase with the increase in sulfuric acid concentration, temperature, partial oxygen pressure, and the decrease in particle size. Moreover, the results demonstrate that the process of indium leaching is controlled by interface chemical reaction, with apparent activation energy of 65.7 k J-mol. The apparent reaction orders of sulfuric acid and oxygen partial pressure are determined to be 0.749 and 1.260, respectively. The leaching reaction process follows shrinking unreacted core model. And finally, the kinetics model equation is established for indium.

Collectorless flotation of marmatite with pine oil

The interaction between pine oil and marmatite without collectors and activators was investigated by flotation,scanning electron microscope and energy-dispersive spectrometer（SEM-EDS）,infrared（IR） spectroscopy,Zeta potential,and first-principle theory calculations.The flotation results show that marmatite exhibits considerable floatability with the addition of pine oil.SEM-EDS results show that carbon atomic ratios on the surface are significantly high,which suggests that the flotation of marmatite is caused by the adsorption of pine oil.Further evidence of the adsorption mechanism was given by IR,and Zeta potential examining pine oil depends on the physical adsorption on the surface independently.The first-principle theory calculations indicate that pine oil molecule adsorbs on Zn and Fe atom surfaces by ionic bond and covalent bond of adsorption energies of-1.23and-1.51 eV,respectively.P orbital of O atom,s orbital of Zn atom,and d orbital of Fe are the major participants.

铁成分对硫化锌精矿的半导体性质及化学反应性的影响

硫化锌精矿(以下简称精矿)除含有主要元素锌与硫外,还含有其它元素,尤其是含有相当多的铁。在湿法处理精矿时,其铁成分的行为取决于铁的矿物存在形式。精矿中的铁可以铁闪锌矿[(Zn,Fe)S)、黄铁矿、黄铜矿的形式存在。铁闪锌矿的铁含量可在很大的范围内变化,其物理化学性质也随铁含量而变化,因此对精矿的湿法直接处理产生很大的影响。本文研究出一种可靠的、确定精矿矿物组成的化学分析方法,着重于测定铁在精矿各矿物中的分布,及铁闪锌矿铁含量的变化规律。在此基础上,实验研究了精矿中的铁(尤其是铁闪锌矿中的铁)对精矿的半导体性质的影响规律,应用半导体电化学原理讨论了精矿铁含量对精矿的直接浸出(常压、硫酸介质)的影响机理。