Ammonia Leaching of copper has been studied in order to develop a hydrometallurgical process for removal of copper from automobile scrap. An air injection method in a closed circuit system, by which large flow rate of air can be injected into leaching solution without vaporization loss of ammonia, was introduced in order to obtain high copper dissolution rate. The leaching tests were carried out in a 200-liter tank under conditions of 40°C, air flow rate 100Nl/min, a nd initial concentration of cupric copper 16-18g/l. Pseudo-motor scrap, motor scrap and their mixtures with schredder scrap, and dynamo scrap were used as test samples. It has been found that shredder scrap has nothing to do with leaching rate of copper from pseudo-motor scrap or motor scrap. The copper dissolution degree from pseudomotor scrap, motor scrap and dynamo scrap was 100%, at 2.5 hours, about 85% at 5 hours and 80% at 5 hours, respectively. From above test results, it has been showed that ammonia leaching with the air injection method in the closed circuit system is effective for removal of copper from automobile scrap.
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Zhou et al. (1995) studied this question.