Part of the transporter belt cajamarquilla refinery located 20 kilometers east of the city of lima; near the town of chosica. it is the main refinery of its kind in the country; and one of the most important in the world. there the zinc concentrates are refined coming from the great quantity of mines that the peru; among them lima; junín and pasco. one of the processes for the refining of concentrate corresponds to the zinc leaching process whose objectives are: to dissolve the zinc contained in the product of the roasting step (calcine); in a solution of sulfuric acid (spent electrolyte)