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Chemistry

Chemical Extraction

In a metallurgical extraction process, one wishes to concentrate the metal Mx from a mixture of Mx and My. The situation here is that there will be some My in the product and some Mx in the slag. Ideally, the extraction should consist of Mx only in the product and My only in the slag. Process A and Process B are compared to determine which of them is the better extraction process.

Process A	Mx	My
Product	1025	3975	5000
Slag	38975	156025	195000
	40000	160000	200000

Which is the better method?

Process B	Mx	My
Product	1018	3782	4800
Slag	38982	156218	195200
	40000	160000	200000

How do we do it?

Our strategy is as follows:

This type of chemical extraction can be treated as a digital system where p and q must both be levelled and then reduced. That is, p and q must first be made approximately equal and then reduced. Consequently, any comparison of process performance must include levelling.

Process A

Mx

My

Product

1 - p

p

1

Slag

q

1 - q

1

1 - p + q

1 - q + p

2