Gold mine heap leaching drip operation system (2)

2.1     Immersion gold solution dripping method  

2.1.1     Overview of dripping methods

     The method of applying the dripping technology to the immersion gold solution and uniformly spraying the immersion gold solution on the ore powder has been widely used abroad. According to the summary of foreign manufacturers, drip has the following advantages:

1.         High performance and high reliability, easy to install;

2.         Can reduce production costs;

3.         Eliminate the effects of the wind;

4.         It can be run all year round;

5.         Reduce the damage of chemicals caused by the sun's ultraviolet rays;

6.         Reduce the excretion and loss of the immersion gold solution;

7.         Saving construction costs of liquid storage tanks and water diversion channels;

8.         Automatic cleaning and anti-blocking of the dripper;

9.         Reducing the impact on operators, the surrounding environment and the land is conducive to environmental protection.

Drip can increase the air content in the solution, which means increasing the oxygen content of the chemical reaction and participating in the precipitation of gold deposits; the drip system can precisely control the concentration of cyanide solution and reduce the loss of sodium cyanide in the air. The drip system is easy to increase the temperature control equipment to achieve the purpose of increasing the temperature of the heap immersion chemical reaction. The drip system has high automation, easy operation, high production efficiency, high reliability, less impact on the environment, and relatively low production cost.

2.1.2     Characteristics of the dripping method

2.1.2 .1              The drip system can be integrated with the heating system

     In order to solve the refractory gold ore smelting, roasting is the oldest and traditional pretreatment method for processing gold ore. The advantage of the roasting process is that it has relatively strong adaptability (can handle gold-bearing refractory gold ore), operation The cost is relatively low. A disadvantage of this process is that operating parameters and changes in feed composition more sensitive, less likely to cause burning or burnt, the sulfur-containing ores, and when the under-firing of arsenic-containing minerals decomposition is insufficient, when the calcine partially burnt so that burning The pores of the calcine are closed to find a secondary coating of the particles, resulting in a decrease in the leaching rate of gold. In addition, sulfur dioxide and arsenic trioxide will be produced during roasting, and when the comprehensive recovery is unfavorable, the atmosphere and the environment will be seriously polluted. From the current point of view, as environmental protection requirements become more stringent, the cost of flue gas treatment associated with the process will be greatly improved.

     At the same time of establishing the drip system, we will consider adding heating equipment through the drip system, which will make the dripping method have been improved and developed. In recent years, foreign research institutions are developing and researching more effective heating wet technology. Although it is still in the experimental research stage, it has shown good industrial application prospects like the heating wet technology process.

2.1.2 .2              Precise control of the delivery of immersion gold liquid

     The drip pipe network pressure is much lower than that of the spray, and the solution composition loss is small, and the application amount to the quarry pile can be accurately calculated and controlled, especially after the automatic control system is adopted, the solution concentration and flow rate control are more accurate.

2.1.2 .3              Effective use of gold immersion cyanide and reduced energy consumption

     The drip system avoids the dissipation loss during the solution distribution process, and can accurately quantitatively transport the immersion gold solution into the ore powder pile, thereby reducing the amount of solution used and reducing the energy consumed by the circulation system.

2.1.2 .4              No knots and stagnant water

     The drip leaching technology can completely eliminate the phenomenon of squashing on the surface of the slag powder pile, and eliminate the problem of water accumulation and infiltration in the slag powder, and improve the gold extraction rate.

Chrome Green

Chrome Oxide Green is produced by raw material---chromic ACID/chromium trioxide . It is dark or light green powders.