When the content of useful components in the ore is low, or complex mineral composition useful minerals were extremely fine disseminated when using conventional processing methods using iron ore processing equipment is difficult to obtain a qualified product concentrate, such refractory ore required The best results can be obtained by chemical beneficiation. The core of chemical beneficiation is the leaching of mineral raw materials. The leaching method is to dissolve the target component in the ore and transfer it to the solution by means of one or more solvents, and then recover it.
There are many methods for leaching and there are many classification methods. Here are some common classification methods:
(1) According to different leaching reagents, it can be divided into water solvent leaching and non-aqueous solvent leaching. The former is an aqueous solution of water and various inorganic chemicals, and the latter is an organic solvent as a leaching reagent.
(2) According to the temperature and pressure conditions of the leaching process, it can be divided into high temperature and high pressure leaching and normal temperature and atmospheric pressure leaching. At present, atmospheric leaching is often used, but high pressure leaching can accelerate the leaching process and increase the leaching rate, so it is also a promising leaching method.
(3) According to different movement modes of materials during leaching, there are two kinds of percolation leaching and stirring leaching. The diafiltration leaching process is a leaching process in which the leaching agent passes from top to bottom under gravity or from bottom to top through a fixed material bed under pressure. The percolation leaching can be further divided into in-situ leaching, heap leaching and tank leaching. Stirring leaching is a leaching process in which the ground slurry and the leaching reagent are completed under vigorous stirring. Stirring leaching is a common leaching method, and in some special cases, diafiltration is used.
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