Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate... – Selective differentiation
Patent
1990-04-24
1992-11-10
Hruskoci, Peter
Classifying, separating, and assorting solids
Precedent preparation of items or materials to facilitate...
Selective differentiation
44624, 44627, 209 8, 209 9, 209165, 209167, B03B 104
Patent
active
051616947
ABSTRACT:
A process of selectively agglomerating coal in an aqueous environment while leaving the mineral matter dispersed has been developed. This process is autogenous for hydrophobic particles in that neither an agglomerating agent nor an electrolytic coagulant is needed. It is based on the finding that hydrophobic particles are pushed against each other by the surrounding water structure. This process, which is referred to as selective hydrophobic coagulation, is driven by the so-called hydrophobic interaction energy, which is not included in the classical DLVO theory describing the stability of lyophobic suspensions. The relatively small coagula formed by the selective hydrophobic coagulation process can be readily separated from the dispersed mineral matter by several different techniques such as screening, elutriation, sedimentation and froth flotation.
REFERENCES:
patent: 3371988 (1968-03-01), Maynard et al.
patent: 4204840 (1980-05-01), Yoo et al.
patent: 4272250 (1981-06-01), Burk et al.
patent: 4331447 (1982-05-01), Kamada et al.
patent: 4389306 (1983-06-01), Nakanishi et al.
patent: 4484928 (1984-11-01), Keller, Jr.
patent: 4533086 (1985-08-01), Junttila
patent: 4537599 (1985-08-01), Greenwald
patent: 4657666 (1987-04-01), Snook et al.
patent: 4690752 (1987-09-01), Shaw
patent: 4775627 (1988-10-01), Attia et al.
Nagata, S., 1975. Mixing: Principles and Applications, Halstead Press, New York. pp. 34-44.
Capes, C. E. et al, A Survey of Oil Agglomeration in Wet Fine Coal Processing. National Research Counsel, Ottawa, Canada (1984).
Appleton et al., 1975. Selective flocculation of cassiterite. Journal of the South African Institute of Mining and Metallurgy, 117-119.
Capes, C. E., 1989. Liquid phase agglomeration: Process opportunities for economic and environmental challenges. in: Challenges in Mineral Processing (K. V. S. Sastry and D. W. Fuerstenau, eds.), Society of Mining Engineers, Littleton, Colo., pp. 237-251.
Cheh, C. H., Glass, R. W. and Sehgal, R., 1982. Solvent recovery for the oil agglomeration coal cleaning process. SME-AIME Annual Meeting, Dallas, Tex., Feb. 14-18; Preprint No. 82-48.
Chia, Y. H. and Somasundaran, P., 1983. A theoretical approach to flocculation in carrier flotation for beneficiation of clay. Colloids and Surfaces, 8:187-202.
Christenson, H. K., Claesson, P. M., and Pashley, R. M., 1987. Proc. Indiana Acad. Sci. Chem. Sci., 98:379.
Claesson, P. M., Blom, C. E., Herder, P. C. and Ninham, B. W., 1986. J. Colloid Interface Sci., 114:235.
Delichatsios, M. A. and Probstein, R. F., 1975. J. Colloid Interface Sci., 51:394.
Derjaguin, B. V., 1934. Untersuchungen uber die Reibung und Adhasion, IV. Kolloid Z., 69:155.
Derjaguin, B. V. and Landau, L., 1941. Acta Phys. Chim. URSS, 14:633.
Derjaguin, B. V., Rabinovich, Ya. I. and Churaev, N. V., 1978. Nature (London), 272:313.
Dryzmala, J., Markuszewski, R. and Wheelock, T. D., 1986. Influence of air on oil agglomeration of carbonaceous solids in aqueous suspension. Int. J. Miner. Process., 18:277-286.
Firth, B. A. and Hunter, R. J., 1976. Flow properties of coagulated colloidal suspensions. J. Colloid interface Sci., 57:248-256.
Frens, G. and Overbeek, J. T. G., 1972. Repeptization and the theory of electrocratic colloids. J. Colloid Interface Sci., 38:376-387.
Friend et al., 1973. Cleaning a selectively flocculated mineral slurry. Transactions Institute of Mining and Metallurgy, 82:C235-C236.
Friend et al., 1973. Some Physio-chemical aspects of the separation of finely-divided minerals by selective flocculation. Chemical Engineering Science, 28:1701-80.
Hamaker, H. C., 1937. Physica, 4:1058.
Israelachvili, J. N., 1978. Measurement of forces between surfaces immersed in electrolyte solutions. Faraday Discuss. Chem. Soc., 65:20.
Israelachvili, J. N. and Pashley, R., 1982. The hydrophobic interaction is long range, decaying exponentially with distance. Nature (London), 300:341.
Israelachvili, J. N. and Pashley, R. M., 1984. Measurement of the hydrophoibic interaction between two hydrophobic surfaces in aqueous electrolyte solutions. J. Colloid Interface Sci., 98:500.
Keller, D. V., Jr. and Burry, W. M., 1989. The demineralization of coal using selective agglomeration by the T-process. Coal Preparation, 6: in press.
Koh, P. T. L., Uhlherr, P. H. T. and Andrews, J. R. G., 1985. The effect of capillary condensation and liquid bridging on the bonding of hydrophobic particles in shear-flocculation. J. Colloid Interface Sci., 108(1):95-103.
La Mer, V. K. and Healy, T. W., 1963. The role of filtration in investigating flocculation and redispersion on colloidal dispersions. J. Phys. Chem., 7(11):2417-2420.
La Mer, V. K. and Healy, T. W., 1966. The nature of the flocculation reactions in solid-liquid separation. Solid-Liquid Separation (Pool, J. B. and Doyle, D., eds.) London, Her Majesty's Stationary Office, 44-59.
Pashley, R. H., 1981. Hydration forces between mica surfaces in aqueous electrolyte solutions. J. Colloid Interface Sci., 80:153.
Pugh, R. J. and Kitchener, J. A., 1971. Theory of selective coagulation in mixed colloidal suspensions. J. Colloid Interface Sci., 35(4):656-664.
Rabinovich, Ya. I., and Derjaguin, B. V., 1987. Direct measurement of forces of attraction of hydrophobized quartz fibers in aqueous KCl solutions. Kolloidn. Zh., 49:682.
Rabinovich, Ya. I., and Derjaguin, B. V., 1988. Interaction of hydrophobized filaments in aqueous electrolyte solutions. Colloids Surf., 30:243.
Read, 1971. Selective flocculation separations involving hematite. Transactions/Section C mineral processing and extractive metallurgy. 80:C24-C31.
Schulze, H. J., 1984. Physico-chemical elementary processes in flotation. Developments in Mineral Processing, 4, Elsevier, Amsterdam.
van Olphen, H., 1977. An Introduction to Clay Colloid Chemistry, 2nd edition, John Wiley and Sons, New York, Chapter 11.
Verwey, E. J. W. and Overbeek, J. Th. G., 1948. Theory of the Stability of Lyophobic Colloids, Elsevier, Amsterdam.
Warren, L. J., 1975. J. Colloid Interface Sci., 50:307-318.
Warren, L. J., 1981. Shear flocculation. Chemtech, Mar.:180-185.
Warren, L. J., 1984. Ultrafine particles in flotation. Principles of Mineral Flotation (Proceedings of the Wark Symposium), Austr. Inst. Mining, Brisbane, pp. 185-213.
Xu, Z. and Yoon, R. H., 1989. The role of hydrohobic interactions in coagulation. J. Colloid Interface Sci., 132(2):532-541.
Xu, Z. and Yoon, R. H., 1990. A study of hydrophobic coagulation. J. Colloid Interface Sci.; in press.
Yordan Hernandez, J., 1989. Studies on the stablity of thin films on bubble-particle adhesion. Ph.D. Thesis, Department of Mining and Minerals Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia.
Luttrell Gerald H.
Yoon Roe-Hoan
Hruskoci Peter
Virginia Tech Intellectual Properties Inc.
LandOfFree
Method for separating fine particles by selective hydrophobic co does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for separating fine particles by selective hydrophobic co, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for separating fine particles by selective hydrophobic co will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2288382