微生物氧化硫铁矿烧渣脱硫的研究

Bio-desulphurization of Pyrite Calcine With Thiobacillus Ferrooxidans

在硫铁矿烧渣生物脱硫的实验室试验中 ,研究矿浆浓度、Fe3+浓度及pH值对游离T f 菌浓度和脱硫率的影响。结果表明硫铁矿烧渣脱硫是T f 菌直接作用和由细菌而产生的Fe3+间接作用的联合结果。脱硫速率和菌种氧化活性受吸附在固相上和液相中细菌生长浓度、矿浆浓度、pH值和Fe3+的影响。三价铁离子的添加可影响菌种活性 ,抑制浸出 ,且易在矿物表面产生沉淀 ,降低氧化率。经生物氧化脱硫后 ,硫含量降至 0 33% 。

The effects of solid concentration in the slurry, Fe 3+ concentration and pH on the free Thiobacillus ferrooxidans concentration in the solution and the desulphurization rate of the calcine are investigated by the bench test on the bio desulphurization of pyrite calcine The results show that the bio desulphurization process is the combination of the direct bacterial action on the mineral surface and the indirect leaching by the ferric ion produced in the bacteria reaction Desulphurization rate and the T f oxidative activity are influenced by the growth of T f adhered to the mineral, solid concentration in the slurry, Fe 3+ concentration and pH in the solution The bacteria oxidative activity can be interfered by the addition of ferric ion and the desulphurization is inhibited, the rate of desulphurization is decreased by the sediment of mineral surface At bio desulphurization, the content of the sulphur in the residue is decreased to 0 33%, it is consonant with the standard of the iron ore