Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate... – Selective differentiation
Patent
1975-04-14
1978-03-07
Nozick, Bernard
Classifying, separating, and assorting solids
Precedent preparation of items or materials to facilitate...
Selective differentiation
209 11, 209 49, 2091117T, B07B 1300
Patent
active
040778711
ABSTRACT:
Process for color sorting of particulate glass employing as the basic concept the differential heating by irradiation and absorption of preselected colored glass particles and contacting such irradiated and differentially heated glass particles with an organic thermoplastic material which melts over a narrow temperature range, the preselected colored glass particles being heated by such irradiation to within the aforementioned temperature range and causing melting of the organic thermoplastic material in contact with such glass particles but without causing melting of the inorganic thermoplastic material in contact with the other glass particles, and thereby enabling separation of the differentially heated colored glass particles in contact with the melted organic material from the remaining glass particles.
According to one feature of the invention for carrying out the above concept, a mixture of particulate colored glass such as amber and flint glasses are coated with 1-tetradecanol, and the amber glass is differentially heated by irradiaton to a temperature in excess of 38.degree. C., causing melting of the tetradecanol, the temperature of this coating on the flint glass being insufficient to melt the coating. The mixture is placed in a froth flotation apparatus in which the amber glass containing the previously melted alcohol coating floats, while the flint glass on which the alcohol coating was not melted, does not, permitting removal of the amber glass, the flint glass remaining in the pulp in the machine.
According to another embodiment for carrying out the invention concept, a surface in the form of a glass sheet is coated with 1-tetradecanol, and a mixture of amber and flint glasses are irradiated causing heating of the amber glass absorbing the irradiation to above 38.degree. C while the flint glass which does not absorb such irradiation is not heated to above 38.degree. C. The resulting glass particles are poured upon the tetradecanol coated glass sheet, and following cooling to room temperature the differentially heated amber glass adheres to the alcohol coating while the flint glass does not so adhere and falls off the sheet.
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Kumar Tribhawan
Morey Booker W.
Geldin Max
Lane William G.
Nozick Bernard
Occidental Petroleum Corporation
Patrick William N.
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