Ammoniacal System Pressure Leaching Of Copper Oxide Cobalt Technology Was Studied

Cobalt is not only an important strategic metals, which is widely applied in aviation, electrical appliances, chemical industry, battery, etc, but also an important additive of superalloy and alloy steel. With the acceleration development of industrialization and urbanization in the world, resource of energy is becoming increasingly reduced and the application of the battery is widely. However, cobalt is a vital metal consist of battery. The exploitation and utilization of cobalt resource is predictly reach a new climax in the next period of time. Since the shortage of cobalt resources in our country, raw materials are basically relied on imports. This subject comes from a domestic cobalt smelter, the raw material is oxidized copper and cobalt ores which is import from Congo. The oxidized copper and cobalt ores is low copper and cobalt grade with high transportation costs, If in the crude ore origin of ammonia high leaching, ammonium leaching solution directly through the ammonia evaporation get cobalt copper mixture, ammonia evaporation condensate and residual liquid return to dip ore, cobalt copper mixture transportation to return China, greatly reduces the transportation cost, cobalt and copper mixture shipped back to home after, the use of the traditional acid soluble, extraction, copper and cobalt to separation and other impurities separation, production of cobalt salt process, can save much acid and alkali amount and labor, reduce the waste residue and wastewater discharge, to achieve the purpose of more clean production.Existing cobalt smelting process is mainly the acid leaching method, this topic put forward the method of ammonia high pressure leaching oxidized copper and cobalt ores new method, in ammonia sex system, leaching selective, cobalt, copper, nickel, zinc and other valuable metals with ion form in ammonia into leaching solution, but calcium, magnesium, iron and other metal almost not enter the leaching solution.This topic research NH3-(NH4)2SO4-H2O system in high pressure of leaching process. Through a lot of experiments, examine the total ammonia concentration, ammonia, the liquid-solid ratio than ammonium, reductant dosage, time, temperature and ore sample size to copper and cobalt leaching rate influence. Also through expanding the experiment, the more reasonable design experimental process, reduce the dosage of the reducing agent. Determined the best comprehensive leaching process conditions:leaching process using two paragraphs leaching, Ore sample size95%≤300mesh, in high pressure kettle inside, temperature of100℃, liquid-solid ratio for six, ammonia and ammonium salt than2:1, total ammonia concentration for7mol·L-1conditions, a leaching and two sections of leaching reductant dosage from ore in respectively three price cobalt content0.5times and1times. Copper and cobalt leaching rate were above95%.In ammonia evaporation process, Investigation the distillation quantity and cobalt sink relationship. Experiments show, when distillation quantity of30%, Distillation residual liquid cobalt concentration in just0.0071g·L-1, Distillation of sediment cobalt content for34.49%, copper for18.39%, Compared with the cobalt ore, copper and content increases about5～10times. Ammonia evaporation condensate and residual liquid return to dip ore, the test shows returned after mines with liquid leaching ones, dip the result is same mine, copper and cobalt leaching rate still can achieve96%above.Considering direct distillation products are cobalt copper mixtures, if we use the technique of Ammonia pressure of leaching copper oxide cobalt ore in domestic, the follow-up process is still time-consuming, high acid consumption, high cost. So this project simply explore the soaking liquid ammonia use (NH4)3PO4precipitation in addition to Ca, Mg, Fe, and use the P204impurity P507gathers cobalt from the after removing impurity liquid,or detach copper from cobalt in after removing impurity liquid by means of D001resin ion exchange method and to get refined cobalt products, the former performance reception is poor through the experiment, using the ion-exchange resin method in after removing impurity liquid of D001can achieve the purpose of the separation of copper and cobalt. The strength order of the exchange capacity Metal ions and DOOlis as follows:Cu>Ni>Mn>Zn>Fe>Mg>Co.