The demulsification effect of demulsifier containing aluminum sulfate on emulsion of wire-drawing oil

Abstract

Aluminum sulfate was used as a demulsifier to demulsify the lad-made emulsion of wire-drawing oil with different concentration. After demulsification，the COD，turbidity and pH value were measured，and the removal rate were calculated. Then，the demulsification effect of the aluminum sulfate alone and the composite demulsifier of aluminum sulfate-poly aluminum chloride were examined. The results show that the aluminum sulfate possesses the more stronger demulsification in several demulsifiers，the COD and turbidity in its treated water layer reached 70% and 60% respectively. However，the use of aluminum sulfate alone for the waste emulsion of wire-drawing oil of medium and high concentration from actual production showed poor performance，due to the emulsifying waste oil and water could not be layered. The composite demulsifier of aluminum sulfate and poly aluminum chloride，exhibited more effective demulsification on this waste. After stirring for 10 min，the removal rate of COD and turbidity of the medium concentration of waste emulsion reached 98% and 91% respectively，while 99% and 97% respectively for the waste of high concentration waste.

Keywords

• demulsifier
• emulsion
• aluminum sulfate