Oxidation of copper hydrometallurgical heap leaching
So far, the copper hydrometallurgical processing of low-grade ore-based. Heap leaching (heap leaching) the most important low-grade copper oxide ore leaching, usually built with specialized mining of ore heap leaching operations, heap leaching has a strict operating procedures.
Leaching of waste rock to open up mining process, commonly known as the void heap leaching (dump leaching), its operating procedures should be simple, much more extensive. Some scholars, however, contain chalcopyrite leaching cycle is very long ore heap leaching, also known as the dump leaching.
Build the heap before the preparatory test face
In order to properly grasp the heap leaching of the technical and economic indicators, the need for adequate leaching test of chemical and engineering in the implementation of the heap leach project, and typically include: the mineral composition of the ore, composition, chemical and physical properties determination, such as the total copper and acid grade, dissolved copper leaching, permeability, leaching rate, and acid consumption.
Need to determine the main parameters of the heap leaching of ore particle size, spray leaching fluid speed and piled high. The test methods include column leaching test heap leaching. But during the column dip before we need to do some preparatory test.
In order to determine the acid soluble copper ore leaching and acid consumption, often using the ore pulverized to 90% -200 mesh, roller bottles or stirred tank in the amount of various acid leaching tests, in order to obtain ore The maximum leaching rate.
Nugget of the leaching process, the leaching fluid through the holes and porosity of the ore to the ore block penetration, dissolved metals should be spread out through the holes and pores. Therefore, ore block holes and pores determine the permeability of the ore block and the leaching rate. The penetration rate is not constant, but decreased with time exponentially, that is, the more the slower to the nugget.
Leaching with sulfuric acid, the starting speed of up to 0.2mm / h away from the surface 50mm only 0.03mm / h, while in the l00mm at 0.005 mm / h. Saturated with a diameter of 200mm, 1% of the porosity of the ore block will take about a year.
Column leaching test
The column leaching test nugget filled in the hollow column leaching solution from the top of the column leaching, flows through the mine leaching solution collected from the following export. This is very similar to heap leaching, so often used this method to obtain the heap leach design parameters, and assessment to predict the future production plant. Column leaching should be small and gradually enlarge.
The column leaching of the content of the ore grade, particle size, acid leaching solution concentration and cloth sprinkled speed, column height and temperature, etc. leaching results. The leaching results in addition to copper, but also pay attention to the concentration of iron and cobalt metal and the acidity of the leaching solution. Such as the sulfide copper minerals in the ore also deal with the oxidation potential of the solution to be monitored.
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