Study On Simultaneous Removal Of PH₃ And H₂S By Manganese Slag Pulp Method And Its Mechanism

Electrolytic manganese slag has the characteristics of complex material composition,small particle size and large emission.The large accumulation of electrolytic manganese slag not only occupies land resources,but also restricts the sustainable development of the industry.At the same time,the electrolytic manganese slag is piled up in the natural environment for a long time.Into the soil,which will cause harm to the ecosystem.Hydrogen sulfide(H₂S)is a highly toxic,corrosive gas that not only corrodes mining equipment,but also causes eye irritation and breathing problems,damages the nervous system,and increases the risk of respiratory diseases.Phosphine(PH₃)is a malodorous,highly toxic,carcinogenic and highly reactive gas.Effective removal of H₂S and PH₃ is not only a necessary condition for product quality control,but also a necessary condition for maintaining public health.Electrolytic manganese slag is a hazardous waste.If it can be used as a removal agent to remove sulfur and phosphorus,it has great practical significance.Therefore,this article selects manganese slag to remove H₂S and PH₃ simultaneously,and explores its reaction mechanism.Through solid-liquid separation,the active component distribution of manganese slag was studied.It was found that the phases of the active components iron,manganese,and calcium in the electrolytic manganese slag mostly exist in the acid-soluble state,which is easy to react with acid.The metal active components have been experimentally proven to be mainly distributed in the liquid phase and exist in ionic form.The reaction products are mainly sulfate,phosphate and copper sulfide.Copper sulfide is obtained by the reaction of copper ions and hydrogen sulfide.The formation of sulfate may be because part of the hydrogen sulfide is oxidized into polysulfide in the presence of oxygen,and then converted,and then gradually converted into sulfate.Phosphate formation may be the direct oxidation of phosphine to phosphate in the presence of oxygen.It may also be caused by the reaction between the early phosphine and the copper sulfate produced by the reaction.Aluminum ions promote the desulfurization and dephosphorization effects by promoting the faster generation of sulfates and phosphates.The influence of operating conditions on it was examined.It is found through experiments that the content of manganese slag,reaction temperature and oxygen content have a certain degree of influence on the catalytic oxidation activities of H₂S,PH₃ and the removal liquid.Excessive oxygen will accumulate the oxidation products of elemental sulfur,sulfate and phosphate on the surface and cause the catalyst to be deactivated,thereby reducing the removal efficiency.Excessive manganese slag concentration will hinder the mass transfer of H₂S and PH₃ in the liquid environment.The inlet concentration and gas flow have a significant effect on the removal efficiency of H₂S,PH₃ and the removal liquid,and directly affect the removal effect of H₂S and PH₃.The best reaction conditions are:Manganese slag:deionized water(MS:RO)=1:40;H₂S:PH₃=4:4;reaction temperature is 35?;oxygen content is 1%;gas flow rate is 250m L/min.