Using of "Roasting - Leaching" methods for copper Recovery from a flotation concentrate of Yangla copper ore

Through earliest experimental study to tailings of Yangla copper ore known that under the best conditions of the flotation process can be obtained a copper concentrate which copper grade of 1.43% and recovery was 29.71%. Due to copper minerals embedded in this materials at a very fine particle size, and closely symbiosis with iron content and quartz, lead to it difficult to enrichment through ore dressing methods. And copper minerals mainly exist in the form of sulfide copper mineral, it can not by leaching method for processing directly, thus put forward a process to deal with this materials of enriched concentrate conduct to sulfuric roasting -leaching, which on the premise of guaranteed cost is not high, ultimately achieve the goal of recycling all kinds of valuable elements. Through the test of low temperature sulphation roasting - leaching to the flotation of copper concentrate shows that under the conditions of temperature of 450 degrees C for copper concentrate roasting 135 minutes, and after the calcine cooling, then with concentration of 4% sulfuric acid and Liquid-solid ratio of 3:1 leaching of 80 minutes, ultimately available to the test targets of copper leaching rate of around 81%.