Accordingly,the ammonium sulphide method followed by combined process of magnetic separation-flotation was adopted in this experiment and the zinc concentrates with grade of 36 86%and 36 51%and recoveries of 54 51%and 48 96%were obtained respectively.
Leaching process for two kinds of sulphide concetrates in Shandong and Guangdong has been studied. The leached ratios can go up to 96% and 93% respectively with solutions of [S2O32-] = 0. 8 mol/L, [NH3] = 1-2 mol/L, [NaCl] = 1. 0 mol/L. Sodium dodecyl sulphonate 11. 0 mmol/L at 50 ℃ in 3 h.
Leaves of Phyllanthus singampattiana, locally known as Aathuchadai by the Kanis of Tamil Nadu in India is consumed for curing jaundice, diarrhea and dysentery.
Fourier transform infrared (FTIR) analysis was used to identify the chain structure of the UV-curable polyurethane prepolymer based on HTPB and the curing process.
when the ESO content is 30% and the curing agent content is 7%, the ESO toughened phenolic resin possesses optimal performance.
When the content of nano-SiO2 was below 1.5%, the amount of free formaldehyde decreased, and the viscosity and bonding strength of resin increased with an increase in the added nano-SiO2, which did not prolong the curing time.
The curing behavior of BLF resin adhesive, studied by TG-DSC and IR analyses, showed that BLF resin adhesives had a lower curing temperature than PF adhesives but had the same characteristic trough in IR spectra as PF adhesives.
The method is based on the reduction of spadns by sulphide in micellar media.
It is concluded that a change in the morphology of palladium films has no direct influence on the degradation of the hydrogen sulphide sensitivity of MIS sensors that arises after sensor annealing in air enriched with hydrogen.
Stable isotopic composition of the intrusive massive sulphide deposits
Arsenic removal from water by iron-sulphide minerals
In bench-scaled experiments, iron-sulphide minerals, pyrite and pyrrhotite are used as adsorbents for arsenic removal from As-spiked water of As5+ and As3+ species.