Research On A New Technology For Arsenic-removal Adsorbed From Copper Electrolyte

In the copper electrorefining process,high arsenic content in the electrolyte will harm the normal operation of the copper electrolysis process and even affect the quality of refined copper.Therefore,it is necessary to control and remove arsenic in the high-arsenic copper electrolyte.In this paper,the technology about process control of sorbents modified,remove arsenic,regeneration and recycling was research by modified sorbents in the way of adsorbed.The research contents are as follows:First,through the experiment of adsorbed modifier A for different kinds of adsorbents,it was determined that the preferred adsorbent was X001 macroporous resin,the concentration of modifier A was 0.5243 mol·L^-1,and the sulfuric acid concentration of the modified solution was 0.5 mol·L^-1,The adsorption capacity of modifier A of X001 macroporous resin can reach up to 44.72 mg·g^-1,under conditions of liquid-to-solid ratio 2:1,temperature 40°C,oscillating speed 150 r·min^-1,and constant temperature oscillation for 2 h.Secondly,through the experiment of adsorbing arsenic in copper electrolyte,the optimum conditions of static arsenic removal by modified X001 macroporous resin were determined.Under the conditions of the liquid-solid ratio 2:1,temperature 60°C,and oscillating speed 150 r·min^-1 and 3 h,the arsenic removal rate can reach over 90%,the arsenic concentration can be reduced to about 0.01 mol·L^-1,the loss rate of modifier A is about 14%,and arsenic can be determined at the same time.X001 macroporous resin absorption regeneration process better process conditions,the results show that,in the NaOH concentration of 2 mol·L^-1,liquid-solid ratio 2:1,temperature 40°C,150 r·min^-1 constant temperature oscillation for 2 h,The recovery rate of arsenic was 98.20%,and the arsenic concentration of the recovered liquid was about 4.8 mol·L^-1.There was no loss of the modifier A,the process operation was stable,and the recycling effect of the regenerated adsorbent was good.Again,through the dynamic adsorption and removal experiments of copper electrolyte,it was determined that the saturated adsorption capacity of X001 macroporous resin to Modifier A was 58.70 mg·g^-1,the penetration volume was 30 m L,and the penetration time was 15 min.The saturation adsorption amount of arsenic is 16.77 mg·g^-1.And the enrichment of arsenic in the regeneration and regeneration liquid of modified X001 macroporous resin is well achieved.Finally,through experiments,the modifier A remaining after remove arsenic by the modified X001 macroporous resin has proved no effect on the electrolysis and electrowinning processes of the copper electrolyte.under the condition of liquid to solid ratio 2:1,temperature 60°C,oscillating speed 150 r·min^-1,and constant temperature shaking for 2 h,residual modifier A can be good recycled by the use of X001 macroporous resin.The recovery rate is about 90.50%,the concentration of modifier A can be reduced to 0.009 mol·L^-1;after adding modifier A,the modified X001 macroporous resin can reach a total adsorption capacity of 56.mg·g^-1,the rate of removal arsenic in the copper electrolyte can reach over90%,the arsenic concentration can be reduced to about 0.0095 mol·L^-1,and the modifier A has a good recycling effect.In this paper,a new process for removing arsenic from copper electrolyte with high acid content is proposed,and a set of simple and easy-to-operate method for arsenic removal of copper electrolyte is established for industrial production.