Cyanidation is one of the main beneficiation methods for gold mines, and it can be divided into two types: stirring cyanidation and percolation cyanidation. In this process, the mixing cyanide gold extraction process mainly includes cyanide-zinc replacement process (CCD and CCF) and non-filtered cyanide carbon slurry (CIP and CIL). The commonly used gold separation equipment is mainly zinc powder replacement device , leaching stirring tank, low consumption rapid desorption electrolysis system.
1. Zinc powder replacement device is a method that uses zinc powder to extract gold from precious liquid in the cyanide-zinc replacement process. The present invention is mainly aimed at gold ore beneficiation equipment that contains high silver content in gold ore. After purifying the precious liquid and removing oxygen, a zinc powder replacement device is added to obtain gold mud. When zinc powder (silk) is used to replace precipitation and recover gold, the so-called cyanide-zinc replacement method (CCD and CCF) can be used in production practice, or zinc powder replacement can be used to treat expensive solutions (leaching solutions). Generally speaking, in addition to gold mines with higher silver content, zinc powder replacement devices can also be used to process gold concentrates that need to improve their grade.
2. Double impeller leaching stirring tank The double impeller leaching stirring tank is a commonly used mineral processing equipment in the carbon slurry gold extraction process (CIP method and CIL). Under the drag and stirring action of the double impeller, the slurry flows downward from the center, diffuses through the surrounding damping plates, injects air at the end of the shaft, mixes with the slurry and circulates upward. This solution is suitable for applications with small specific gravity, low viscosity and slow precipitation rate. , when the ore particle size is above -200 mesh and the gold solution concentration is less than 45%, a uniform suspended mixture can be formed. Absorption and other mixing operations. In the CIP process of gold deposits, leaching and adsorption are independent operations. In the absorption operation, the leaching process is basically completed. The size, quantity, and operating conditions of the adsorption tanks are determined by the adsorption parameters. The CIL process of gold deposits involves simultaneous leaching and adsorption operations. Since the leaching operation generally takes longer than the adsorption operation, the size of the leaching stirring tank is determined by the leaching parameters to determine the amount of aeration and dosing. Because the absorption rate is related to the function of the dissolved gold concentration, 1-2 levels of pre-soaking are usually performed before edge immersion to increase the concentration of dissolved gold in the adsorption tank and increase the leaching time.
3. Low-consumption rapid desorption electrolysis system. The low-consumption rapid desorption electrolysis system is a set of gold ore dressing equipment that desorbs and electrolytes gold-loaded carbon to produce gold mud under high temperature and high pressure. The gold-loaded carbon slurry is sent to the carbon separation screen (usually a linear vibrating screen) through a carbon pump or air lifter. The screen surface is washed with clean water to separate the carbon from the slurry. The gold-loaded carbon enters the carbon storage tank, the slurry and the flushing water. Enter the first section of the adsorption tank. Using a low-power and fast desorption electrolysis system to add anions can replace Au(CN)2- with Au(CN)2-, and the precious liquid obtained by desorbing gold-loaded carbon can recover solid gold through ionization method. The low energy consumption rapid desorption electrolysis system has a desorption rate of more than 98% under high temperature (150°C) and high pressure (0.5MPa) conditions, and the power consumption is only 1/4~1/2 of the conventional system. The non-toxic and side-effect combination contains carbon activator, which can regenerate carbon. The lean carbon does not need to be regenerated by fire method, which saves the cost of carbon regeneration. The gold slurry is of high grade, does not require reverse electrolysis, and is easy to extract. At the same time, the low-consumption rapid desorption electrolysis system also adopts three safety measures, namely the intelligence of the system itself, the automatic pressure limiting and reducing mechanism, and the insurance safety valve.
Post time: Feb-18-2024
