Complex Carbonaceous Gold Ore Roasting Workshop Leaching Design
Gold is an important metal resource in China and has always been the focus of mineral processing. Gold ore is divided into free gold ore containing free gold, gold mineral particles and gold-bearing minerals, and complex carbonaceous gold ore containing gold coupled with sulfide minerals Because of the complexity of the ore type of this type of ore, there are many differences in beneficiation process and separation process. Roasting and leaching are common roasting and leaching processes for complex carbonaceous gold ore. Here is an introduction to the design of the complex carbonaceous gold ore roasting and leaching workshop.
The leaching process of complex carbonaceous gold ore is significantly affected by the grade, size and silica content of the ore. Therefore, before leaching of complex carbonaceous gold ore, it needs to be crushed. Single-stage and two-stage closed grinding operations are mostly adopted. Steel balls and steel rods are used as crushing equipment. The fineness of the crushing should be as fine as possible. The fineness of grinding is usually - 0.074 mm.
The next step is to roast the complex carbonaceous gold ore. The purpose of roasting is to reduce the sulfur content, destroy the ore structure and make the gold attached to the sulfur dissolve. Roasting is the oxidation process of ore combined with sulfur. Generally, a carbonaceous material, such as coal or petroleum coke, is added to the oxidizing roasting to provide sufficient heat energy. The roaster is a rotating baking furnace, in which the ore and carbonaceous material are mixed and fully contacted in the rotating furnace. The residence time of the roaster is usually 20-60 minutes.
The roasted complex carbonaceous gold ore is then pretreated by leaching. Its purpose is to make the gold available, dissolve the gold, and separate the gold and gangue particles. The leaching process for complex carbonaceous gold ore adopts a closed-circuit leaching process of ore-solution-liquid-solid. The pretreatment method for leaching of complex carbonaceous gold ore includes agitation leaching, countercurrent washing, pressure leaching, acid-base washing, etc. The leaching agent is generally a Y-type composite leaching agent composed of a strong acid, a weak acid and an oxidizing agent.
After roasting and leaching of complex carbonaceous gold ore, chemical agents such as activated carbon and zinc powder are usually used to adsorb, capture and adsorb the dissolved gold. Commonly used equipment for adsorption and recovery of gold includes activated carbon adsorption column, zinc powder displacement column, zinc dust spray and other equipment. After the gold is adsorbed and captured, it is recovered by smelting or electrolysis.
In summary, the roaster and leaching workshop of complex carbonaceous gold ore is divided into crushing, roasting and leaching, pretreatment, adsorption and recovery, each of which is an important part of the workshop design. Choosing and properly combining these process links according to the requirements of production and the characteristics of ore is a common method for efficiently processing complex carbonaceous gold ore in China.
