The global gold resources are gradually depleting, and the development and utilization of gold mines are facing huge challenges. The traditional way of developing mineral resources can no longer meet the current market demand for gold, especially the processing of low-grade gold ore. Gold tailings are a by-product of gold beneficiation, which often contain precious metals that have not been selected. How to reprocess these gold tailings and recover the gold in them has become the focus of attention in the mining and environmental protection industries. Through advanced technical means, the reprocessing of gold tailings can not only improve the gold recovery rate, but also reduce the pollution of tailings to the environment, and realize the efficient utilization and sustainable development of gold resources. The following will discuss the reprocessing technology, application and development of gold tailings.
Use the table of contents below to navigate through the guide:
01What are gold tailings?
After gold ore is processed by crushing, grinding, flotation and other mineral processing processes, the remaining mineral waste is gold tailings, which often contain a small amount of gold, silver and other precious metals. Due to the limitations of traditional mineral processing and recycling technologies, it is difficult to effectively recover the gold in the tailings. At present, most of the treatment methods for gold mine tailings in the world are mainly stacking and soaking, which leads to waste of resources, tailings leakage, soil and water pollution and other problems. Therefore, how to efficiently achieve the recycling of gold tailings has become an urgent problem to be solved.
02Gold tailings reprocessing technology
The main gold tailings reprocessing technologies include flotation, gravity separation and cyanidation.
-Flotation method: Change the properties of the mineral surface and recover the gold particles in the tailings through foam separation. This method has been widely used, but it should be noted that this method is highly dependent on the type of mineral.
-Gravity separation method: The sedimentation speed of gold ore particles and other substances in water is different. This feature can be used to separate gold particles. This method is mainly used to recover gold from larger ores, and the recovery effect of gold particles in tailings is not good.
-Cyanidation method: Dissolve the gold in the gold ore through chemical reactions, and recover the gold in it through electrolytic reduction or activated carbon adsorption. This method has a high recovery rate, but it is important to pay attention to whether cyanide remains in the tailings.
03Economic and environmental benefits of gold tailings reprocessing
Reprocessing gold tailings can not only bring significant economic benefits, but also protect the environment.
Economic benefits: Improving the recovery rate of gold particles in gold tailings can significantly increase the income of the mineral processing plant and reduce its production costs. With the continuous development and advancement of mineral processing technology, the gold recovery rate of tailings has gradually increased.
Environmental benefits: Long-term accumulation of tailings will have serious negative impacts on the environment. The application of gold tailings reprocessing technology can effectively reduce the pollution of surrounding soil and water resources caused by tailings. By combining with environmental protection technology, tailings treatment will be more in line with environmental protection standards.
04Xinhai Mining gold tailings treatment cases
1. Guizhou 700tpd gold tailings dry stacking project
The Guizhou 700tpd gold ore tailings dry stacking project was undertaken by Xinhai Mining. According to the gold tailings volume and tailings properties of the project, Xinhai Mining designed a thickener + filter press gold tailings dry stacking process. The tailings are pumped to the thickener by the slurry pump for thickening, and the thickener underflow enters the filter press for dehydration to achieve tailings dry stacking. The overflow of the filter press and thickener is sent to the previous flotation workshop for recovery.
2. Mongolia 120tpd gold tailings cyanide removal plant
The tailings in this project are tailings after cyanide leaching and filtration. Because the minerals contain water and cyanide, they need to be removed. The tailings from the disc filter are sent to the high-efficiency stirring tank for slurry mixing, and bleaching powder and water are added for full stirring. The mixed slurry enters the double-blade stirring tank for cyanide removal. The slurry that meets the standards is sent to the filter press for dehydration, and the filtrate is sent to the high-efficiency stirring tank for mixing.
Gold tailings reprocessing technology is an important way to achieve efficient utilization of mineral resources and sustainable development. With the advancement of science and technology and the improvement of equipment and technology, the treatment of tailings with complex components and difficult to select will be more efficient, and intelligent, green and efficient mineral processing will also become the core trend of development. The use of advanced mineral processing technology can not only improve the recovery rate of gold in gold mine tailings, reduce resource waste, but also effectively protect the environment. Gold tailings reprocessing will become an important direction in the field of gold mine mineral resource development and ecological protection.
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