Arsenic content in copper concentrates is continuously increasing worldwide. It desirable to remove arsenic from the earlier stages of making due deposition cathode during electrorefining process. Effects temperature, flux, and oxygen on distribution converting fire refining processes were studied using FactSage 8.2. The results showed that can be effectively removed by proper selection slags. ...

We investigate forcing notions with the rectangle refining property, which is stronger than the countable chain condition, and fragments of Martin’s Axiom for such forcing notions. We prove that it is consistent that every forcing notion with the rectangle refining property has precaliber א1 but MAא1 for forcing notions with the rectangle refining property fails.