The next step in the recycling strategy of the grinding sludge is to separate the grinding swarf from the abrasives. For this separation, a dry screening (Retsch AS 200 control) was used to divide the grinding sludge into seven fractions. The used mesh widths were 1000 μm, 500 μm, 250 μm, 63 μm, 45 μm.
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A method of and an apparatus for compressing the grinding sludge, which is effective to compress the grinding sludge to provide an intended rigid briquette even though the grinding sludge contains ground chips of hardened iron and/or steel materials and an oil-based coolant and also to facilitate reuse of the briquette (B1) as material for production of steel.
The Thyrnau plant recycles more than 120,000 litres of oil every year. "By pressing with the RUF machine we recover between 100 and 120 tons of oil per year from the grinding sludge", explains Johann Zinöcker. Since the oil has a density of only about 0.85 g/cm3, these masses correspond to a volume of about 120 to 140 cubic meters.
The sludge discharged during the grinding process contains moisture or oils used as a coolant, and both transport and waste disposal of this sludge are extremely difficult. A grinding sludge solidification machine efficiently compresses the sludge, thereby reducing weight and volume. It also converts the solidified sludge into a briquette form ...
Briquetting Systems Get The Best Out of Grinding Sludge. Briquetting grinding sludge can pay off in many ways. Instead of paying a lot of money for disposal, cooling lubricants and oils can be recovered. High costs can be saved through their subsequent re-use. Simultaneously you create compact, almost completely oil-free metal briquettes, which ...
grinding unit. While grinding is indispensible to achieve the necessary precision and surface finish, the company would gladly do away with the grinding sludge produced in the process, admits Erwin Haag. This sludge consists of minute metal chips and grinding oil. Depending on its consistency, disposal of the sludge can be very expensive.
The grinding sludge comprises of oil based coolant (cutting oil) and metal chips. This study aims at treating the sludge economically for its oil removal and reusing dried sludge in concrete blocks and clay bricks. The paper includes major findings of the study and summarises the best detergent for washing of sludge.