The activeeffect of lead ion on sphalerite,the changes of(Pb~(2+))in pulp along with oxidized con-dition of mineral surface and pH values and the resulting chain reaction with dosagesof zinc sulphate were discussed.
The authors investigate the dissolving behavioutr of magnesite and its associated mineral-dolomite, and thereby predicate and determine their zero potential and study the effect of Ca~(2+) and Mg~(2+) on the mineral surface's dynamic potential.
0—20 g/L HCP solutions create at 70℃ interfacial tension of 11.3—8.87 mN/m with degased crude oil(of viscosity 121.8 mPa·s) from Gudao C2S district,alterate oil-wet and weakly water-wet mineral surfaces in direction of increasing surface hydrophility as shown by their decreased contact angle values.
In this paper,the chelating ability,the interaction mechanism between CF collector and the metal ions(Zn~(2+),Pb~(2+) and Fe~(3+)) on mineral surfaces have been examined by means of nephelometric titration,XPS tests and the calculation of the group electronegativity of the flotation reagent.
Diethyldithiocarbamate(DDTC) is the most suitable collector for galena and the suitable potential at which DDTC and galena react each other to form PbD 2 ranges from 0 to 0.2 V. Moreover, DDTC can depress the surface overoxidation of galena surface. Also,the study has shown that in the range of -0.9 to 0.6 V,the hydrophobic PbD 2 can be firmly adsorbed on the surface of galena.
The electronic structure of the galena surface and absorbing models of flotation reagents on the galena surface are studied using molecular dynamics simulation program Materials Studio and empirical quantum program MOAN,which can analyze the interaction of molecular fragments and molecular orbital component.
The flotation mechanism is reasonably explained, and several electronic transfer styles of flotation reagents with the galena surface are discussed. The p π conjugate system of mercaptobenzo flotation reagent is very important in flotation, and the molecular number of monolayer saturation absorbing in unit area of galena surface calculated is in correspondences with the experimental value.
Surface corrosion and passivation behaviors of galena are investigated by electrochemical techniques. Tafel and EIS spectrum demonstrate that formation of PbCO_3 passivation film on the surface of galena results in increasing of galena surface resistance and decreasing of reaction current and leaching rate of galena.
Enzymic oxidation of phenolic precursors on the mineral surface was substantially more rapid than abiotic oxidation and led to synthesis of a highly polymeric fraction with a molecular weight over 75 kDa.
Possible types of anion-cation packing of mineral surface were evaluated.
Interactions between the dissolved mineral species and other mineral surface were investigated using solution chemistry calculation,ζ-potential measurement, AES analysis and flotation tests.
Study on interaction energy between flotation reagent and mineral surface
The interaction between a flotation reagent and mineral surface not only depends on the bonding atom, but also depends on the adjacent atom of mineral surface, a flotation reagent and the medium in the system of flotation.
Types of anion-cation packing of mineral surfaces and their manifestation in various processes
It was shown that there are two distinct types (I and II) of mineral surfaces differing in the character of crystallization of gold nanoparticles during decoration.
The use of UNIFAC for the estimation of adhesion enhancement between polymers and mineral surfaces treated with silane coupling
Compatibility is enhanced between polymers and mineral surfaces through the use of silane coupling agents of varying chemistry.
The experimental results on adsorption of ions pb2+, Zn2+ and Ag+ onto mineral surfaces in a mix system show that the reaction kinetics of adions adsorbed onto mineral surfaces was mainly controlled by their diffusion rates in solution.
A galvanic contact between galena (or sphalerite) and pyrite contributes to decreasing the content of zinc in lead concentrate, and enhances remarkably the absorption of collector on the galena surface.
Transistor action on natural galena surface after heat treatment with H2S
The galena surface over the outermost inclusions is plastically deformed, and specific depressions, or infrequently bulges, are formed.
Furthermore, metallic lead can begin to deposit on the galena surface when the potential drops below about -330 mV SHE.
Second, the enhancement of the dissolution rate observable at high sodium chloride concentration may be due to the specific adsorption of chloride ions or the surface complexing of chloride ions on the galena surface.