Technological mineralogy and environmental activity of sulphur concentrate and sulphur tailings from zinc sulfide oxygen-pressure leaching process
Chemical composition,the particle size distribution and structural properties of sulphur concentrate and sulphur tailings from zinc sulfide oxygen-pressure leaching process were examined by the combination of various detection means such as inductively coupled plasma optical emission spectroscopy(ICP-OES),X-ray diffraction analyzer(XRD),scanning electron microscopy(SEM)-energy spectroscopy(EDS)technique,Fourier infrared spectrometer(FTIR)and differential scanning calorimetry(TG-DTA).In addition,the short-term environmental activity of sulphur concentrate and sulphur tailings were investigated by toxic leaching procedure(TCLP).The results show that the No.1 and No.2 sulfur concentrates mainly exist as spherical elemental sulfur.A small amount of No.1 sulfur concentrate exists as sphalerite,pyrite,etc.,which are attached to massive alum particles,with an average particle size of 22.1 μm.A small part of No.2 sulfur concentrate exists as massive sphalerite,pyrite and other small particles,with an average particle size of 59.2 μm.Moreover,the sulfur concentrate will burn violently at 185 to 340℃,with thermal instability.No.1 and No.2 sulfur tailings mainly exist as block shaped lead jarosite and sodium jarosite.Among them,the average particle size of No.1 sulfur tailings is 21.1 μm.No.2 sulfur tailing contains a certain amount of hematite(16.86%),with an average particle size of 5.3 μm.The zinc and cadmium elements in sulfur concentrate and sulfur tailings are unstable in weak acid conditions.Among them,the leaching amounts of zinc and cadmium of No.1 sulfur concentrate exceed the limit values of zinc and cadmium by 1.93 and 2.50 times,those of No.2 sulfur concentrate exceed the limit values of zinc and cadmium by 2.03 and 6.65 times,those of No.1 sulfur tailings exceed the limit values of zinc and cadmium by 3.46 and 5.94 times,and those of No.2 sulfur tailings exceed the limit values of zinc and cadmium by 11.10 and 8.82 times,respectively.
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