Wednesday, 7 February 2018

IN SITU LEACHING IS A MIRACLE OR A NEW ADVERTISING MOVE?

Currently, I often meet many projects where they offer In situ leaching of ores (In situ leaching, In-situ leaching (ISL), in-situ recovery (ISR), solution mining).

In situ leaching (ISL) is a miracle or a new advertising move? Let's find out!

Today they use ISL for ores containing:
They suggest using ISL for ores containing:

The use of In situ leaching (ISL) has significant limitations!

The effectiveness of underground leaching depends on:
  • The permeability of the ore body and enclosing rocks (filterability). Permeability of the ore body must to exceed the permeability of the host rocks. Rocks, limiting ore body must be impermeable to the working solution. Reacting of working solution with the ore body should not resist to filtration of the working solution).
  • The chemical and mineral composition of the ore and host rocks. (It should be ensured maximum extraction under economically acceptable reagent consumption. Useful components should not be in the form of isomorphic impurities).
  • The structure and texture of ores (This method is used in permeable sandy deposits of loose and well penetrated ores).
  • The size and shape of the ore body (Applies for deposits of reservoir type).
  • The depth of the ore body (Used for fields located in the upper horizons (shallow ores). The occurrence of the ore body at a depth of 1000 ft and more is considered to be unfavorable conditions).
  • The content of carbonate rocks (grade of more than 2% of carbonates is considered unfavorable condition)
  • The filtration uniformity of minerals
  • The discharge of reservoir waters, their chemical composition
When leaching, you get a solution containing many chemical elements. The separation of these elements can be very expensive.

Manufacturers of reagents do not have a wide assortment of reagents!

The prices are high. Leaching requires a large consumption of the leaching reagents. Therefore the leaching is considerably more expensive than traditional methods of ore processing (ore enrichment). Pumps are also very expensive. So illusions of cheapness and simplicity of In situ leaching (ISL) disappear in most cases of its actual application. When using the underground leaching method, you can make changes only at the design stage. In this case, change the method of separation or technology at the finished plant cannot be made.
I am always very cautious about such projects. Very few deposits can be processed using In situ leaching (ISL).

Sometimes this is a way to sell you a poor deposit under the guise of a new trend!

You can contact our website for more information
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