Abstract:
A method of separating an aqueous solids containing suspension includes (a) subjecting a first solids containing suspension to centrifugal forces so as to separate the suspension into a first gas containing flow, a second gas-free flow and a third flow; (b) feeding the third flow into a flotation cell having a bottom; (c) introducing air at the bottom of the flotation cell into the third flow for separating from the third flow a fourth partial flow; (d) withdrawing the air containing third flow after the separation of the fourth partial flow from the flotation cell; and (e) subjecting the third flow to the centrifugal forces of step (a). An apparatus for the separation of gas and lightweight material from a gas and lightweight material containing aqueous solids suspension is also described and includes a centrifugal pump (2) for separating the gas and lightweight material from the solids suspension with a suspension inlet (20) and an outlet (24) for the lightweight material; a flotation cell (1) for separating the lightweight material from a solids suspension; and a circulation loop connecting the outlet (24) of the centrifugal pump (2), the flotation cell (1) and the suspension inlet (20) of the pump (2).
Abstract:
A process for the recovery of zircon from a particulate zircon-containing material. The process involves contacting the zircon-containing material with a soap solution followed by at least one water wash and at least one acid wash. The acid washed product is then subjected to flotation whereby zircon is floated. The feed material to the process may be a pre-concentrate which is produced by flotation. In a further aspect of the invention titanium containing minerals which are depressed during the zircon flotation stage may be recovered by flotation using an anionic collector such as carboxylate, phosphonate or sulphonated fatty acid. A sulphosuccinamate is preferred.
Abstract:
A process for the purification of soil contaminated with organic material is provided. The preferred process generally involves superposed attrition (35) and classification (40) processes, which lead to removal and concentration of highly comtaminated fractions. The process may also include a step of flotation (60) whereby hydrophobic materials in the soil are released to an interface with air bubbles, and are floated to the top of a flotation cell. In preferred processes according to the present invention, soil to be treated is extracted from a contaminated site, and is broken into relatively small particles. These particles are preferably treated in attrition and classification steps, to remove fine, slow settling, contaminated materials such as wood and fine soil materials. The resulting isolated coarser materials are then treated by flotation for a final polishing step. The process is particularly well adapted for use in treating soil contaminated with oil and grease materials containing PCP therein, from wood treatment plants or the like.
Abstract:
A system (10) for recovering a coolant fluid from a contaminated fluid mixture. The system (10) includes a container (20) structured to permit a fluid vortex to be created therein. The container (20) includes a bottom outlet opening (24) and a tangential inlet means (25). A conduit (30) connects a separator (35) to the container outlet opening (24). A second conduit (33, 34) recirculatesfluid discharged from the container (20) back into the container (20) through inlet means (25) to maintain the fluid vortex created within the container (20). The lighter liquid within the mixture rises to the surface of the whirlpool created by the fluid vortex and is then carried by the vortex forces upon that surface to the outlet opening (24), the lighter liquid thereby being 'skimmed' from the coolant fluid within the container (20). The system also includes a vortex flow limiting device (90, 100) which is mounted in the container (20) near the outlet opening (24).
Abstract:
The method for cleaning sand which contains toxic and hazardous substances consists of the following steps: a) Sieving the contaminated sand with the sieve (3), b) Cleaning/scrubbing the contaminated sand in the attrition machine (4) in the slurry with adding of water from the water tank (5) for the purpose of removing toxic and dangerous substances as well as grease from the surface of the grains of sand, c) Grading/dripping on the dehydrator (8), in which cleaned sand and sludge are obtained, d) Sedimentation of sludge in the conical vessel (14) and removal of sludge by filtration, e) Separation of cleaned sand by grain size by using gravity concentration at the slurry separator (9 and 9') and concentration tables ( 10 and 10') where cleaned sand and wate-rock are obtained, f) Drying of cleaned sand, grading by grain size and storage and packing of sand graded in such manner, water, calcium oxide and aqueous solution of disodium metasilicate, sodium carbonate, benzalkonium chloride and ionic and/or non-ionic surfactants are added in the step b) of the sand cleaning process, which, when mixed within the attrition machine (4) create a mixture for the cleaning of sand and in the step d) filter press (17) is used for making an inert sludge cake.
Abstract:
A powder classification apparatus (10; 110; 210) includes a first chamber (12; 112; 212) that includes a fluidized bed and has an inlet (16; 116; 216A) and an outlet (18; 118; 218), the inlet (16; 116; 216A) configured to receive a gas (G) and distribute the gas (G) in a uniform flow through the first chamber (12; 112; 212), the first chamber (12; 112; 212) configured to receive a powder (P) and the gas (G) and create a fluidization zone, the outlet (18; 118; 218) configured to allow at least a portion of the powder (P) to exit the first chamber (12; 112; 212); and a second chamber (14; 114; 214) having a powder inlet (24; 124; 224) configured to accept at least a portion of the powder (P) from the outlet (18; 118; 218) in the first chamber (12; 112; 212) caused by at least a portion of the powder (P) being ejected from the first chamber (12; 112; 212) by the gas (G).
Abstract:
The value-minerals are captured by gravity-separation, from a low-grade slurry. The ratio of liquids-to-solids in the slurry affects the efficiency of capture, and an ideal liquids/solids ratio is the ratio at which the efficiency of capture is at a maximum. The ideal ratio is different for different particle-sizes. The procedure includes dewatering the slurry, dividing the dry particles by particle-size, and feeding the several size-divided dry-streams into respective capture-stations. Prior to each dry-stream entering its respective capture-station, make-up water is added to the dry-stream in such quantity as to bring the liquids/solids ratio up to the ideal, for that particle-size. The procedure makes it simple to provide accurate measurement of, and accurate control of, the liquids/solids ratio.
Abstract:
The present invention refers to a system and method for the totally dry treatment of iron-ore wastes from previous mining operations, suitable for both the processing of ore wastes deposited in barrages and wastes stored in piles. The present invention solves the problems of magnetic separation processes that employ the wet and waste- dewatering way, eliminating the risks which throwing solid wastes into retention barrages bring by a system and method wherein the moisture degree of the ore is reduced by means of a mechanical stir dryer (using natural gas to prevent contamination), which is then sorted into various fractions and finally separated magnetically, with the important difference of being an entirely dry process.
Abstract:
Das erfindungsgemäße Verfahren zur Aufbereitung von erzhaltigem Material ist dadurch gekennzeichnet, dass das Material in wenigstens einer ersten Mühle zerkleinert wird, das zerkleinerte Material in einer ersten Klassierung in grobes und feines Gut klassiert wird, wobei wenigstens ein Teil des groben Gutes der ersten Klassierung zur ersten Mühle zurückgeführt wird und das feine Gut der ersten Klassierung in einer zweiten Klassierung wiederum in grobes und feines Gut klassiert wird, wobei das grobe Gut der ersten Klassierung optional einer ersten Sortierung in eine erste werthaltige und eine erste minderwerthaltige Fraktion unterzogen wird, wobei die erste werthaltige Fraktion zur ersten Mühle zurückgeführt und die minderwerthaltige Fraktion ausgeschleust wird, das grobe Gut der zweiten Klassierung einer zweiten Sortierung in eine zweite werthaltige und eine zweite minderwerthaltige Fraktion unterzogen wird, wobei die zweite werthaltige Fraktion zur ersten Mühle zurückgeführt und die zweite minderwerthaltige Fraktion ausgeschleust wird, und -das feine Gut der zweiten Klassierung einer dritten Klassierung und anschließend wenigstens einer dritten und/oder vierten Sortierung unterzogen wird.