It is difficult to obtain high recovery rate by conventional mineral processing technology. This paper mainly introduces several new types of refractory gold ore dressing methods, such as carbon, sulfur, arsenic, tellurium, copper and other harmful elements. The
1, ultra-fine grinding method
Ultrafine grinding method is the use of jaw crusher ore crushed to 10 ~ 15 μ m below, so that micro-grain gold exposed, and then increase the contact area with cyanide for the subsequent leaching to provide favorable conditions. Commonly used ultra-fine grinding equipment is mainly produced by ZENITH machine factory Raymond Mill. Ultrafine grinding method has been applied in Australia's Karl Guli coal mine. The actual production results show that this method shortens the leaching time and the leaching rate of gold is obviously improved. Ultrafine grinding is a physical process to pretreatment of gold ore crusher, to solve the chemical oxidation method of waste and bio-oxidation of bacteria pollution of the environment.
2, magnetic pulse pretreatment
As the different components of the ore in the electromagnetic and mechanical properties of the differences, magnetic pulse on the ore and lead to mineral particles magnetostriction and piezoelectric thermostat effect, so that a single particle deformation. In the mineral surface of the mechanical force and electromagnetic field to be concentrated and strengthened, so that the mineral particles produce tensile stress and displacement stress, so that there are many cracks in the ore, gold leaching rate can be increased 0.6% to 9%. As the magnetic pulse technology to apply the tensile force and the wrong power, so that a significant reduction in energy consumption. According to statistics, in the mineral surface on the premise of the same cracks, the magnetic pulse technology is only the conventional mechanical crushing effect of 1/35 ~ 1/100. Magnetic pulse technology has the advantages of high efficiency and energy saving.
3, pressurized cyanidation method
The pressurized cyanidation process is a certain degree of strengthening of the gold leaching process by applying a certain pressure on the cyanidation process, thereby increasing the temperature of the cyanidation process and activating the mineral lattice, increasing the leaching rate and shortening the leaching time. This method is more effective for antimony-containing gold ore. South Korea, a gold mine using pressurized cyanide treatment of antimony-containing gold ore, the gold leaching rate from 61.5% under normal pressure increased to 91.9% after pressurization.