Floatation and acid pickling combined process for processing low-grade mixed copper ore

The invention provides a floatation and acid pickling combined process for processing low-grad mixed copper ore. The floatation process includes the steps that firstly, a novel efficient collecting agent MA is selected to serve as a copper sulfide collecting agent, direct floatation is carried out on copper sulfide, copper oxide ore is recycled through sulfuration floatation and direct floatation, the novel efficient collecting agent MA serves as a sulfuration floatation collecting agent, sodium oleate serves as a direct floatation collecting agent of the copper oxide ore, floatation is carried out on the bulk concentrate, acid pickling processing is carried out in a concentrated mode, and filter liquor is collected after filtration. According to the method, selecting and smelting are combined, the recovery rate of copper is improved, production cost is reduced, and the method is simple and easy to carry out.