Research On Deep Purification Process Of Lead-zinc Mixed Concentrate Oxygen Pressure Leaching Solution

China is a large country for zinc smelting and consumption,with zinc production and zinc consumption ranking first in the world.However,with the continuous exploitation of zinc resources,The resources being exploited have gradually dried up,so it is necessary to find new zinc mineral resources to alleviate the shortage of resources.There is a newly mined lead-zinc mixed ore in a certain place in Yunnan.The mixed ore has large reserves,but the lead-zinc grade is low.It is mainly composed of sulfide ore,accompanied by a small amount of oxide ore.After the mixed ore is processed by flotation and oxygen pressure leaching,an oxygen pressure leaching solution is obtained.This dissertation takes the leaching liquid as the research object,carries out the research on the deep purification process,and uses the goethite method and the antimony salt purification method to study the purification of the leaching liquid to provide qualified electrolyte for the subsequent process.The main research contents include:iron removal technology,removal of copper,cadmium,cobalt,and nickel,and deep removal of cadmium.In the research of iron removal,the influence of aeration mode,reaction temperature,p H,reaction time,seed crystal and other factors on iron removal was explored.The results show that aeration has a significant effect on oxidation and iron removal.Under aeration,it can increase the Fe²⁺oxidation efficiency and significantly improve the iron removal effect,and the iron removal rate can reach 98.32%;The reaction temperature,solution p H,reaction time and other factors also have a significant effect on iron removal.Under the conditions of a temperature of 90?,a time of 2.5h,and a solution p H=3.0-3.5,the iron removal rate reaches 98.64%;in the amount of seed crystals When it is 2g/L,the iron removal rate reaches 98.65%.For the analysis of iron-removing precipitates,the decrease of p H is beneficial to increase the iron content of the slag and reduce the loss of zinc.In the study of antimony salt purification process,the influence of factors such as reaction temperature,reaction time,and zinc powder dosage on the removal of Cu²⁺,Cd²⁺,Co²⁺,and Ni²⁺was explored.The results show that the reaction temperature and reaction time have extremely significant effects on the removal of Co²⁺and Ni²⁺.When the temperature is 80?,the time is 1h,and the amount of zinc powder is 1.8times,Cu²⁺,Cd²⁺,Co²⁺,Ni²⁺are reduced to 0.01mg/L,3.90mg/L,0.36mg/L,0.01mg/L.However,increasing temperature and prolonging time are not good for removing cadmium.Increasing the amount of zinc powder can inhibit the reconstitution of Cd and facilitate the removal of metal ions.Cd reconstituted at high temperature needs to be removed by adding zinc powder at low temperature.When the amount of zinc powder is 1g/L,the reaction time is80min,and the temperature is 40?,the concentration of Cd²⁺in the solution is reduced to 0.02mg/L,and the concentration of iron ions is reduced to 0.17mg/L.