Xanthate itself is a reducing agent and is easily oxidized. When both O 2 and CO 2 are present, the oxidation rate is faster than when only O 2 is present. In the aqueous solution of xanthate, the transition element ion or the ion which can form a poorly soluble xanthogen with xanthate has a catalytic effect on the oxidation of xanthate, and the reaction is:
2ROCSSNa+O 2 ten | 1 | O 2 ten CO 2 ≒ (ROCSS) 2 + Na 2 CO 3 |
2 |
4ROCSSNa+2CuSO 4 ≒Cu 2 (ROCSS) 2 +(ROCSS) 2 +2Na 2 SO 4
The structure of the xanthate oxidation product is:
S S
// //
RO—C—S—S—C—OR
Shuanghuang is a yellow oily liquid that is hardly soluble in water and exists in a molecular state in water. When the PH increases gradually decomposed xanthate, copper deposition used in the flotation of copper ore in an acidic medium permuted leachate obtained. The yellow drug is stored for a long time, in addition to the decomposition failure, it will be partially oxidized into a double xanthate, which also makes the effect worse.
In order to prevent decomposition, it is required to store the xanthate in a closed container to avoid contact with humid air and water; pay attention to fire prevention, should not be exposed to the sun; should not be stored for a long time; do not leave the yellow drug solution for too long, and do not use hot water.
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