Community Research and Development Information Service - CORDIS

Improvement of the treatment and recovery of waste oil emulsions in the steel industry

The research covered the survey, analysis and evaluation in terms of demulsification of industrially used high-duty cooling lubricants and rolling oils. The initial work involved compiling and updating the available data regarding emulsions arising in operation and their treatment. The analysis focused on the materials employed and their composition, the points of arising and quantities involved as well as the quality of demulsified water and oil after various treatment procedures. Assessment of the actual state was ascertained at a chosen demulsification plant with acid/salt-splitting. Trials for the examination of the demulsification processes and of the waste water and oil treatment have shown that the emulsion break up depends strongly on the treated emulsion, the chemical composition of emulsion and oil phase, the temperature and on the added demulsification chemicals. Laboratory tests have been carried out to determine relations between emulsion break up and pH value and problematic emulsion components of high concentrated oily emulsions. Overall, the results gave hints to rolling mills for choosing lubricants and additives with regard on treatment and utilization of resulting waste emulsions. Emulsion break up plants can be designed specifically for the break up problem, reducing effort and operating costs. High-grade splitting products allow reuse of, for example, oil as reducing agent in metallurgical melting processes and water in process integrated loops. Waste production in emulsion break up and after-treatment discharges into the environment and costs for disposal are all reduced.

Reported by

Verein Deutscher Eisenhüttenleute eV
Sohnstraße 65
40237 Düsseldorf
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