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Xinhai mineral processing equipment mainly include: grinding equipment, flotation equipment, dewatering equipment, magnetic separation equipment, and so on. Some of the equipment is Xinhai independent research and development, and has been awarded national patent. View details
Gold CIL (Carbon in Leach) Process is an efficient design of extracting and recovering gold from its ore. By cyaniding and carbon leaching crushed gold ore slurry simultaneously, CIL process lower the gold mining operation cost and increase gold recovery rate to a degree of 99%. View details
On October 11, the 3-day CHINA MINING Conference and Exhibition 2019 was conclud...
Now, the development of gold extraction technology has been relatively mature and complete. Generally speaking, gold extraction processes are mainly flotation and cyanidation, and cyanidation can be divided into carbon pulp, carbon leaching, heap leaching and other processes. Without going into details here, this paper starts with the comparison between flotation and cyanidation processes.
Flotation process is a common metal ore processing process, and it is also applicable to gold ore. It is mainly applicable to the gold-bearing quartz vein ore with fine gold particles and high floatability, multi-metal gold-bearing sulfide ore and carbon-bearing ore. Flotation gold extraction process can be divided into a single flotation process, heavy – floating combined separation process, is relatively simple gold extraction process. The recovery of gold from flotation is considerable, the recovery of sulfide ore can reach 90%, and a few can even reach 95%~97%. The recovery rate of oxidized ore can reach about 75%, some even can reach 80%~85%.
Cyanidation gold extraction process is the main modern method of gold extraction, which has a strong adaptability to gold deposits. Its main process including cyanide leaching, adsorption from cyanide solution, get the finished product and so on several process, can be roughly divided into two kinds, continuous countercurrent washing with thickener, and use of zinc dust replacement precipitation recycling gold so-called conventional cyanidation leaching gold process, and do not need to filter washing, active carbon adsorption of recovery of gold from cyanide pulp directly without filtering cyaniding carbon slurry process, respectively, in the form of zinc dust replacement and activated carbon adsorption to extract gold from cyanide liquid to come out. The process is complicated, but the recovery rate of CIP and CIL is relatively high. The recovery rate of CIP and CIL can be stable at 80% or even above 90%.
Flotation gold extraction is not only simple technology, infrastructure and equipment requirements are relatively simple, a single flotation process equipment and other metal ore flotation equipment is basically not much different. On the contrary, the complex cyanidation gold extraction process determines the complex and strict equipment requirements and infrastructure investment. Therefore, the cost of gold extraction by cyanidation is much higher than that by flotation.
Flotation and cyanidation are both chemical processing methods, therefore, the process of mineral processing is naturally indispensable agents. Foaming agent, inhibitor, activator, collector and so on should be used in flotation gold extraction. The reagent used in the cyanidation process is relatively simple and the ore is leached with cyanidation agent. No matter which process these two technologies are, substances that will damage the environment will be produced in the process. At present, cyanide-free environmental gold extract has been developed as a substitute of traditional cyanidation agents to reduce the damage to the environment.
Let’s take a look at the application of these two gold extraction techniques from practical cases. Cambodia a gold flotation project, the mine ore processing is given priority to with natural gold, but throughout arsenopyrite fissure, pyrrhotite and cleft in the semiconductor and processing difficulty is big, the technical team, according to the mining characteristics, closely combined with the actual, for its design is given priority to with flotation of gold production line, undressed ore for mining large fluctuations, process operation to solve problems such as unstable. The advantages and disadvantages of flotation gold extraction and cyanidation gold extraction are summarized as follows:
From the examples and comparison, we can conclude that the gold extraction technology is not applicable to all mines, no matter flotation or cyanidation. In the process of selecting the technology, the ore dressing test should be carried out on the mine first. According to the experimental results and the actual situation, the most suitable gold extraction method is the best.
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