By M.K.H. Siddiqui
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Extra info for Bleaching Earths
In England, fuller's earth deposits occur at Maidstone, Redhill, Woburn, Clophill, Langton and Bath. On the Continent, it occurs at Mormoiron in France and at Moosburg in West Germany. Similar clay deposits are known to occur in India, Japan, Russia, Hungary, Rumania, Italy, Spain, Morocco, Syria, Argentina, Canada, Australia and elsewhere. In the next few pages, a brief description of the mineralogy of some typical clays which are susceptible to activation is furnished and their DTA records presented.
151 The refining step is followed by introduction into the oil of various inhibitors called additives to protect it from further oxidation and to render the remaining undesirable constituents ineffective or harmless. RECLAMATION OF USED LUBRICATING OILS Contaminants When a refined lubricating oil is used in an automobile engine it deteriorates and becomes unfit for further use. Both physical and chemical changes occur. The physical alteration is a result of undesirable impurities taken up by the oil during its use in the engine, such as road dust, metallic fines from wearing of engine parts, water from leaking jackets and radiators and sooty carbonaceous matter produced as a result of burning fuel oil.
The thermogram is typical of an attapulgite. Distribution 61 OCCURRENCE OF BLEACHING EARTHS IN INDIA FULLER'S EARTH Andhra Pradesh Extensive deposits of fuller's earth have been located in Andhra Pradesh in the intertrappean area near Vikarabad taluq, and Tandur taluq of the Hyderabad district. 153 The samples are being examined at the Regional Research Laboratory, Hyderabad, for their mineral composition and physico-chemical properties. 154 The natural clays possess high bleaching capacity for dark-coloured oils.