Dissociation, hydrolysis and decomposition of xanthate
Dissociation in water:
ROCSSMe = ROCSS - + Me +
The xanthate is hydrolyzed to produce xanthogen. Xanthogen is a weak acid with a dissociation constant between 10 and 2 and 10 -5 .
 ROCSS - + H 2 O ≒ ROCSSH ten OH -
Xanthogen is easily decomposed, and the lower the pH , the faster the decomposition:
ROCSSH ≒ ROH 10 CS 2
     In order to prevent the decomposition of xanthate, it is often used in alkaline pulp. Decomposition advanced faster than lower xanthate xanthate, e.g., in 0.1 mol / L solution of HCI, the average time to complete decomposition of xanthate B is 5 ~ 10min, propyl xanthate 20 ~ 30 min, 50 ~ 60 min butyl xanthate , pentoxanthin 90min . Therefore, if it is necessary to perform flotation in an acidic medium, high-grade xanthate should be used as much as possible.
Xanthate is easily decomposed by heat, and the higher the temperature, the faster the decomposition.
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