Colloid Chemistry in Mineral Processing by J.S. Laskowski and J. Ralston (Eds.)

By J.S. Laskowski and J. Ralston (Eds.)

Inside this quantity is an intensive assurance of the elemental rules embracing smooth theories of colloid chemistry utilized to mineral processing. it really is written in admire for Dr. J.A. Kitchener, exotic Reader within the technology of Mineral Processing within the Royal university of Mines, Imperial collage, collage of London (recently retired). Dr. Kitchener's services in colloid chemistry has resulted in a number of primary insights and useful advances in flotation, selective flocculation, and the therapy of slimes.

Colloid chemistry is necessarily all for all elements of mineral processing, starting from how creditors selectively adsorb directly to mineral surfaces in flotation, to the forces which keep an eye on the steadiness of dispersions of submicron debris, in addition to embracing the behaviour of hydrolyzed steel ions in solid-water slurries. The clever use of this data is vital within the powerful layout of separation strategies and methods by way of the mineral processor. modern bibliographies are integrated on the finish of every of the thirteen chapters making this quantity an invaluable basic source for researchers, scholars and mineral processors

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Th e attractio n betwee n oppositely charge d doubl e layer s can be demonstrate d by mixin g suspension s of finely-ground ion-exchang e resin s of strong-aci d (-ve ) an d strong bas e (+ve ) typ e in water ; the y immediatel y coagulat e int o voluminou s floes whic h can be see n unde r a microscop e to consis t of alternat e catio n an d anio n exchangers . (Identificatio n is facilitate d by dyein g on e of th e resins. ) Anothe r lin e of evidenc e is provide d by th e stabilit y (strictl y metastabilit y ) of soa p films at equilibrium .

Kitchener 26 of th e water/minera l interface . Thi s is a rathe r imperfectl y explore d are a of surface physical-chemistry . Th e majo r poin t to be emphasize d is tha t no minerals, howeve r iner t the y may seem , are totally without chemical interaction with water. It ma y be confine d to th e outermos t atomi c layer , it ma y involv e considerabl e dissolution , or it ma y trans form th e whol e particle . g . ) Classification of minerals by crystal-chemical type Th e bul k of th e earth' s crus t consist s of small , poorly-developed , intermingle d crystals , quit e unlik e th e beautifu l specimen s see n in museum s — thos e ar e th e rarities .

Complication s ofte n occu r throug h interferenc e betwee n the differen t mineral s present . It migh t be suppose d tha t th e mineral s in an ore woul d be mutuall y in equilib rium , havin g remaine d in clos e proximit y for million s of years . Bu t fine-grinding of an or e in wate r may set off new processe s throug h dissolution , hydrolysis , ad sorption , oxidatio n or colloida l interaction . Th e activ e surface s of freshl y crushe d crystal s may adsor b ion s from slightl y solubl e constituents ; for example , a trac e of Pb 2+ comin g from oxidizin g galen a may be sufficien t to "activate " silicat e toward s flotation reagents .

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