continuous leaching
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The leaching process generally involves: discharging material from a storage bin, and then feeding it into the leaching tank using a belt conveyor or a screw conveyor, either in a batch manner or continuously. I am now considering using a screw conveyor as an leaching device; this would allow for continuous leaching and also reduce the need for intermediate transportation steps. I’m not sure if this will work, so I would appreciate some advice from the experts here. Thank you! This post was last edited by limingshuguang on 2009-2-10 09:56.]
The original poster’s idea is great; it’s just that the mixing intensity of the screw conveyor is too low, so it certainly won’t meet the requirements for leaching. In fact, pipeline leaching in the alumina industry is a method to reduce leaching during intermediate transportation steps.
I believe it can be achieved using spiral leaching equipment; the key is to control the residence time of the materials. Such equipment is already being used for leaching traditional Chinese medicines, and metals should be easier to leach than the components in traditional Chinese medicines
It’s conceivable in theory, but extraction requires airtightness, as well as factors such as the soaking time of the liquid, so it’s not feasible
It’s completely feasible; to extend the leaching time, we have started adding chemicals for leaching at the grinding stage, and the results are very good
I’m not sure in what system the leaching process you have in mind takes place; if it is carried out in an acidic environment, have you considered anti-corrosion measures?
Leaching at normal temperature and pressure, or heap leaching
What I propose is to carry it out in an alkaline system, normally by leaching in a stirrer tank, with a leaching time of 1 to 4 hours, and the leaching rate can reach 90 to 99%. Sealing is not an issue.
Factors such as the leaching time of the material to be leached and the medium should be considered.
Mechanically activated leaching is a relatively effective method at present for improving the leaching rate and reducing the leaching time