Tailings dewatering has always been one of the important links in concentrators, and gold tailings are no exception. The separated gold tailings slurry is dewatered by the tailings dewatering equipment and then sent to the mine for dry stacking. This is an effective way to increase the storage capacity pressure of the tailings pond, reduce the potential safety hazards of the tailings pond and reduce the environmental pollution of the tailings. In addition, the dewatered gold tailings can also be recycled. What are the common dewatering equipment for gold mine tailings? Let's get to know.
At present, the equipment used for tailings dewatering mainly includes cyclone, thickener, dehydration screen and filter.
In the dewatering operation of gold tailings, dehydration type hydrocyclones (or cyclone groups) are generally selected to pre concentrate the tailings, which can effectively improve the sand settling yield of gold tailings and the overall dewatering efficiency. At the same time, it greatly reduces the operating load of filtration and concentration equipment and improves the processing capacity of the equipment.
The dewatering hydrocyclone installed in Xinhai mine is equipped with a special fishtail device and siphon device at the desilting nozzle. By adjusting the pipe valve of the siphon device, the concentration of tailings underflow can be adjusted to 78%, which is higher than the dehydration efficiency of the conventional hydrocyclone.
In the dewatering operation of gold tailings, the commonly used thickeners are mainly deep cone and high-efficiency thickeners. Among them, the deep cone thickener adopts the setting of large cone angle and deep cone, which greatly increases the compression area of the thickener. Even if the tailings are fine in particle size and low in concentration, the underflow concentration can still be very high, and the floor area is small and the efficiency is high. The concentration of tailings slurry can be concentrated to 60% - 70% with less equipment and civil construction investment costs.
In addition, the multi cone structure of the deep cone concentrator can change the compression zone to make the tailings underflow concentration higher; Inclined plates are installed in the central settlement area, which can increase the settlement area of the thickener by more than 8 times, effectively prevent the floating of fine particles, improve the concentration of tailings underflow, and make the overflow water clearer.
The high-efficiency thickener is a new type of equipment at Xinhai innovation point. In order to transform the thickener for high efficiency, it is mostly suitable for treating fine-grained and micro fine-grained gold tailings. In the tailings dewatering process, the flocculant concentration technology can greatly increase the settling speed and solid flux of fine-grained tailings, so as to obtain a high underflow concentration.
The dewatering screen installed in Xinhai mine for the dewatering of gold tailings is a new type of equipment. It is a high-efficiency high-frequency dewatering screen with simple structure, convenient maintenance and simple operation. Because of its large processing capacity and good dewatering effect. In the dewatering operation of gold tailings, the high-efficiency high-frequency dewatering screen vibrates at the high frequency of the motor. The special screen design not only makes it difficult for slurry particles to pass through the screen hole, but also has higher dewatering efficiency. Finally, dry piled tailings with a water content of less than 15% can be obtained.
In the dewatering operation of gold tailings, the commonly used filter equipment includes belt filter and box filter press. Among them, the belt filter press has a long filtering time and strong adaptability to coarse-grained tailings due to its powerful roller pressing and integrated dehydration. The moisture content of the filter cake can be controlled within 20%.
The van type filter press adopts positive pressure, high pressure and strong dehydration. Its filter cake has low water content, low energy consumption, and the filtrate is clear and transparent, which can meet the requirements of direct discharge of environmental protection waste water. The water content of the filtered dry residue is below 8%.
The above are the dehydration equipment commonly used in the dehydration of gold mine tailings. A single dehydration equipment can often not meet the ideal dehydration requirements. Therefore, Xinhai has designed a tailings dry discharge process, which can meet various dehydration needs by combining a variety of dehydration equipment into different dehydration processes.
