Pyrite has long been used as a source of sulphur and its recovery as a by-product from the flotation of certain base metal ores is a well established practice. Large tonnages of mill tailings which have accumulated as a result of various milling operations frequently contain significant amounts of pyrite. In many instances these tailings can be treated to yield pyrite concentrates that are a suitable source of sulphur dioxide for the manufacture of sulphuric acid. Such concentrates must normally contain at least 48 sulphur.Get A Quote
Pyrite has long been used as a source of sulphur and its recovery as a by-product from the flotation of certain base metal ores is a well established practice. Large tonnages of mill tailings which have accumulated as a result of various milling operations frequently contain significant amounts of pyrite. In many instances these tailings can be treated to yield pyrite concentrates that are a suitable source of sulphur dioxide for the manufacture of sulphuric acid. Such concentrates must normally contain at least 48 sulphur.
Initial treatment of the tailings preparatory to pyrite recovery depend upon the source and particle size of the material to be treated. Fine material such as flotation tailings normally does not require size reduction prior topyrite flotation. On the other hand coarse tailings such as those produced from certain gravity concentrating operations must be ground to provide a product suitable for flotation. This study deals with various types of tailings and subsequent treatment methods.
Fine tailings may be either mineddry and transported to the mill by truck or they may be mined hydraulically and the resulting pulp pumped to the mill. In either case the tailings should be screened prior to treatment to remove tramp oversize and debris.
The surfaces of pyrite contained in old mill tailings are frequently oxidized to such a degree that recovery by flotation may be difficult. Hence removal of the oxidized films may be necessary in order to achieve satisfactory recovery of a pyrite product with acceptable purity.
Removal of the oxidized surface films is most effectively accomplished by scrubbing at densities of from 70-80 solids in a Attrition Scrubber. This machine is equipped with specially designed rubber covered turbine type propellers which promote an intense inter-particle scrubbing action which removes the undesirable oxidized coatings from the pyrite. Tailings which are mined dry may be diluted with water to the proper consistency for scrubbing. Hydraulically mined tailings normally require thickening to remove excess water prior to the high-density scrubbing.
Tailings in which the pyrite is not free from the associated minerals or which is too coarse to be handled by flotation as mined must first be reduced to the proper particle size by grinding. This is accomplished in a Steel Head Ball Mill in closed circuit with a Spiral or Rake Classifier.
The scrubbed tailings or the classifier overflow from the grinding circuit as the case may be flow to a Super Agitator and Conditioner where reagents are added to activate the pyrite. For this purpose a xanthate or dixanthogen type collector is normally used. Since pyrite generally responds most satisfactorily to activation in an acid circuit sulphuric acid in a quantity sufficient to produce a pH of 6 or below is also added to the conditioner.
Final cleaning normally consists of two stages with the cleaner tailings being returned to the head of the rougher flotation circuit.
The cleaned pyrite flotation concentrate is pumped to a Spiral Rake Thickener to remove excess water prior to filtering. A Adjustable Stroke Diaphragm Pump mounted on the thickener superstructure meters the thickened pyrite to a Disc Filter. Since the filter is often operated only at fixed intervals sufficient thickener capacity is provided to adequately store the concentrates accumulated during filter shut-downs. The Adjustable Stroke Diaphragm Pump is used for recirculation of the thickened solids during such periods.
Where water must be reclaimed for re-use the rougher flotation tailings are thickened in a Spiral Rake Thickener and the plant water is reclaimed.
The Co occurs mainly in the mineral siegenite Ni Co3S4. There are also minor occurrences of the mineral bravoite Ni Co FeS2. The NiCo3S4 is most frequently found as intimate replacement inclusions with the chalcopyrite CuFeS2 fig. 2 and occurs in the mill streams as middled particles with the CuFeS2 fig. 3. The NiCoFeS2 occurs mainly as bands in host pyrite fig. 4 and so is usually found middled with pyrite or marcasite. Bravoite can also occur as discrete grains in host gangue fig. 5.
Earlier U.S. Bureau of Mines research concentrated on separating the NiCo3S4 from the CuFeS2 in the Cu concentrates. The Cu concentrates contain 30 pct of the contained Co at an average grade of 0.50 pct which represents an improvement ratio of 33 over the mill feed grade. Two separate flowsheets were developed using a regrind to a d50 of less than 10 m followed by reverse flotation to recover the Co as NiCo3S4 into the tailings and the CuFeS2 as an enriched concentrate. Combined Co and Ni grades exceeding 7 pct at recoveries of 80 pct were possible.
Six 1-ft Denver flotation cells were used for the continuous rougher flotation tests. An additional six 0.25- ft Hazen-Quinn flotation cells were available for use as a two-stage cleaner circuit during the cleaning tests. Feed for the system came from a bleed stream off the tailings return line from the mill8217s on-stream X-ray analyzer system. Using this stream made it possible to monitor the Pb Zn Cu Fe and Co assays on the feed and the density in percent solids by weight. These data were printed out every 5 min in the mill control room.
The feed to the float cells was regulated by using an adjustable splitter box fig. 6. Pulp transfer from cell unit to cell unit was done by utilizing the built-in pumping action of the Denver cells or by air-driven diaphragm pumps. Flotation reagents were added using adjustable- speed peristaltic pumps. Flow rates and densities were monitored at 10-min intervals to allow for reagent adjustment on a pound per short ton basis and to allow for adjustments in the feed rate to keep that parameter within the predetermined test limits.
In all tests the volume and weight percent solids in the feed were checked at 15-min intervals. These figures were then averaged to give a weight of feed per minute over the entire run. Samples of the feed tailing and concentrate streams were also taken at 15-min intervals and these composite samples were assayed for Co Cu Fe Ni Pb and Zn. Using these assays and the feed weight concentrate weight was calculated with the two-product formula as follows
Baryte is crisp and brittle crystal is big tubular. Generally use gravity separation magnetic separation flotation to select. Application 1. Process High brightness minute powder and supper micropowder. After crushing flotation whitening get High brightness minute powder from baryte. 2. produce barium salt products such as lithopone barium chloride barium hydroxide etc.It is a high .
THIS invention relates to a process for recovering value metals from ore 50 configured 5 such as to substantively reduce or eliminate the need for a tailings storage facility. This object is achieved through an integrated processing system designed to enhance the ratio of sand residue from coarse flotation 62 to the amount of tailings arising from fine flotation 72 and then blending a .
Flotation Tailings scientific. A joint process of flotation and magnetic separation was proposed to process the ore This paper introduces the test results of flotation tailings by a wet drum separator Results show that iron concentrate assaying 6021-6812 Fe at a recovery of 719-7532 can be obtained when the flotation tailings assays 3391Fe
Table of ContentsColumn FlotationEffect of Collector AdditionEffect of pH and Redox PotentialAutoclave-CIL A preliminary series of laboratory flotation tests was performed to determine the nature of the unleached gold values of the CIL tailings. The gold in the Mercur mining district has been identified historically as being associated with sulfide and carbonaceous minerals in addition to a .
Barite has numerous applications including barium mud for oil well drilling manufacture of elemental barium filler for paper and rubber industries and contrast material for X-ray radiology for the digestive system. Currently froth flotation is the main method for the
In the optimum flotation conditions the Mo Pb Cu and Zn were obtained over 95 yields and approximately 6 fluorite passed into concentrate phase. Mo and Cu containing phase were enriched with high yield by selective flotation of concentrate obtained from the concentrate. On the other hand the most of Pb and Zn remained in tailing.
flotation cell in the presence of different reagents. These reagents include sodium silicate which is a commercially-used gangue dispersant and in-house synthesized novel gangue depressant Hy-PAM. Moreover several influencing parameters such as solid contents of the flotation pulp pulp pH and pulp residence time were investigated to optimize the
At the present time the technology has been applied to two very common methods of water treatment flotation treatment and low pressure membrane treatment. For flotation treatment systems the application of the Nanoflotation technology is through the use of a surfactant and a patent pending high intensity mixing system.
baryte flotation process - taxizada.nl Traduire cette page. barite flotation process - miningbmw Baryte - Wikipedia the free encyclopedia Baryte or barite Ba S O 4 is a mineralconsisting of barium sulfate The baryte group consists of baryte celestine Get Price 727 Online Baryte - Wikipedia.
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