Method and apparatus for leaching metal from mining ore
a technology of mining ore and leaching solution, which is applied in the direction of heat treatment equipment, furnaces, manufacturing tools, etc., can solve the problems of insufficient leaching and metal removal of channels, channeling produces a very uneven distribution of leaching solution in piles, and the metal yield is low, so as to avoid channeling and environmental concerns, the effect of reducing the rate of clogging and high metal yield
Inactive Publication Date: 2013-08-29
SWAN HLDG
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The solution achieves higher metal yields, reduces water consumption and environmental concerns, and extends the operational life of the leaching system by minimizing evaporation and clogging, while maintaining a consistent delivery rate over extended distances.
Problems solved by technology
This practice is rarely seen today because of the tremendous amount of water loss (e.g., evaporation and runoff) with this method.
Channeling produces a very uneven distribution of the leaching solution in the pile, with some areas extremely wet and others dry.
Gold and copper are only leached from ore that makes direct and extended contact with the leach solution, and therefore in piles using drip emitters there are areas between the channels that do not get adequate leaching and metal removal.
Still further, because drip irrigation applies the solution to the surface of the pile, and because a large volume of solution is dripped onto a select spot, drip emitters cause pooling and ponding of the leach solution on the top surface of the ore pile.
While burying drip irrigation is possible, when buried the emitters tend to clog, further reducing the efficiency of the leaching process and greatly increasing the amount of labor required to keep them in operation.
Although the leach solution 9 can quickly saturate the area below each of the individual emitters 8, spanning out in the process, there are still large areas between the emitters where the amount of leaching solution is deficient, reducing the efficiency of the process.
Still further, when leach emitters are buried, the emitters quickly clog with particles of ore, sand or soil, further reducing the efficiency of the leaching process and greatly increasing the amount of labor required to keep them in operation.
Here the problems are even greater.
The pooling of leach solution on the surface leads to evaporation losses and potential injury to wildlife.
As a result of these multiple problems with buried drip lines, the vast majority of users continue to lay the drip line emitters on the top surface of the pile.
Method used
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[0047]FIG. 2 is a schematic representation of one embodiment of the invention in use, showing a porous mining leach pipe 20 buried (e.g., 6 inches to 18 inches) below the surface 16 of a pile 15 of mining ore. The porous pipe, as described further below, provides a uniform and slow distribution of leaching solution 19 along the length of the pipe. The leaching solution seeps through a microporous wall and wets the outer surface of the pipe, in contrast to the dripping action of the prior art drip line emitters. The seeping action more effectively soaks the adjacent earth in the mining pile, avoids pooling and increases the proportion of the ore in the pile that is in contact with (wetted by) the leaching solution over an extended period of time—a necessary component of an effective and high volume leaching process. The pipe is designed to withstand the burying process, as well as the weight of the ore piled on top of the pipe. Still further, the microporous structure of the pipe res...
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Abstract
Porous leach pipe and method for leaching metals from mining ores. The porous pipe may be buried beneath the surface of a pile of mined ore, providing a more even and uniform distribution of the leaching solution across the pile, increasing metal yields, reducing water consumption and eliminating pooling and ponding of the solution on the top of the piles as occurs with prior art drip line emitters.
Description
[0001]The present invention relates to a method and apparatus for leaching metal from a pile of mining ore, which method and apparatus delivers a leaching solution more uniformly across the pile thereby increasing metal yields, reducing water consumption and reducing environmental concerns.BACKGROUND[0002]Copper, gold and other mined ores are blasted or crushed into small chunks and placed directly into large heaps where the ore can be irrigated with a leach solution of e.g, sodium cyanide (NaCN), potassium cyanide (KCN), or sulphuric acid (H2SO4), applied to the pile. The solution percolates through the heap, bonds to particles of metals such as gold or copper, and the leach solution is then captured (e.g., by an impermeable plastic or clay-lined leach pad at the bottom of the pile) and processed into pure metal. The leach process through a pile typically takes several weeks. Once the metals are removed, the leach solution is recycled and used again on the pile to leach more metal....
Claims
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IPC IPC(8): C22B34/32C22B3/00C22B15/00
CPCC22B3/02C22B3/04C22B34/32C22B15/0065C22B11/04Y02P10/20
InventorMITCHELL, WILLIAM S.
OwnerSWAN HLDG