A 56,700 MTPD grinding circuit consists of rod milling, followed by closed circuit ball milling with hydrocyclone classifiers. Primary grinding cyclone overflow averages 8.0 percent plus 0.208mm (65 mesh). ... As an example, the copper flotation columns were operated with holes in the sparger fabric for a period of time.
Abstract. In th e current research work, influences of particle size, grinding time, and agitation rate on. the flotation of a copper sample from Sungun copper mine (E. Azerbaijan, Iran ...
Variation in the slurry pH and pulp potential in both the milling and the flotation circuit may result in altered flotation response, with losses of value to tailings and diluted concentrate grade. ... At Silver Queen mine (Canada) a combined lime-starch-SO 2 conditioning scheme is used for copper flotation from the Pb/Zn sulphides (Bulatovic ...
Grinding and Flotation. Fine ore at minus 19mm (¾") sizing is fed at a controlled rate into the open-circuit 2600mm x 3960mm (8'-6 x 13'-0) Hardinge rod mill at an average feed rate of 2,106 STPD or 87.75 STRH. Rod mill discharge at a nominal size of minus 16 mesh and a pulp density of 75 percent solids combines with ball mill …
As ore grades constantly decline, more copper tailings, which still contain a considerable amount of unrecovered copper, are expected to be produced as a byproduct of froth flotation. This research reveals the occurrence mechanism of copper minerals in typical copper sulfide tailings using quantitative mineral liberation analysis (MLA) …
One large copper operation with two stage grinding and cyclone classification, actually treats cyclone underflow, — 20 plus 100 mesh, through Unit Cells. ... usually at the mill feed box. Flotation can be carried out in a pulp containing as much as 65% of solids, but water is added in most cases to bring the W/S ratio to about 1/1. In …
The mill discharge was transferred to an XFD-1 L flotation cell, and the pulp density of copper slags was adjusted to 33%. The impeller speed of the flotation machine (model: XFD-1 L, Wuhan Rock Crush & Grand Equipment Manufacture Co., …
Typical flow-sheets in flotation practice. Flotation enters into mill flow-sheets in two capacities, viz.: (1) as a method of treatment accessory to gravity concentration; (2) as the principal method of concentration. ... 5 Miami Copper Co. mill; 6 The Inspiration Consolidated Copper Co. mill; 7 Mountain Copper Company, No. 1 …
Currently, the slags are sent to a milling and flotation plant for liberation and recovery of residual copper. The copper recoveries realized in the plant are much lower than expected and it has been postulated that some copper minerals may be occurring in forms that are more difficult to float like oxides or fine disseminations in the gangue ...
Usual Quantity Fed: Average figures in lbs. of reagents per ton of mill feed are shown and are to be used only as a guide. Flotation Reagent Pumps. ... Especially adapted to flotation of copper and gold ores in lime circuit. Non-frothing promoter. Minerec 27: Similar to Minerec A & B: Undiluted liquid
The Inspiration Consolidated Copper Co. mill. The Inspiration Consolidated Copper Co. mill, at Miami, Ariz., is described by R. Gahl in Trans. A. I. M. E., Vol. LV, page 576. The mill employs both agitation-froth flotation and bubble-column notation, some of the sections being equipped with one type of machine and some with the other.
The discharge from the tube mill is first passed through a 4-mesh screen to separate out coarse material, which is laundered direct to the classifier. The remainder of the pulp, diluted to give a W/S ratio of 1/1, passes to a Denver " Sub-A" Flotation Cell, from which 60% of the gold and silver in the feed is removed as a concentrate.
The copper content of the slags range between 0.8 to 5 wt. % and this is considered too high for disposal to the environment. Currently, the slags are sent to a milling and flotation plant for liberation and recovery of residual copper.
Design Study for 400-Ton per Day Flotation Plant The sulphur mill was designed for best adaptation to the mill site available. The design provided for simplicity of construction and final operation, and full usage of construction items available. Process FLOWSHEET The flowsheet was based on laboratory tests wherein troublesome factors …
Flotation is a common mineral processing method used to upgrade copper sulfide ores; in this method, copper sulfide mineral particles are concentrated in froth, and associated gangue minerals are separated as tailings. However, a significant amount of copper is lost into tailings during the processing; therefore, tailings can be considered …
Minera Escondida, located in the Antofagasta Region of northern Chile, is the world's largest producer of copper as concentrate and SX-EW cathode. Projects to increase mill and flotation capacity began soon after start-up in 1990 to off-set decreasing copper grade. Subsequent projects had the objective to increase copper production …
This paper focuses on optimizing the parameters of the copper ore flotation process, which is the most expensive in obtaining copper concentrate, in order to …
The three product solution illustrated above can be somewhat simplified by taking an intermediate tailings sample between the two stages of concentration; i.e., a copper tail (zinc feed) sample in the previous example. Then, adding the notations: Copper tail (zinc feed) = CT with copper and zinc assays = c 5 and z5. Assume mill feed, F, as …
Flotation. To estimate the number of cells required for a flotation operation in which: W—Tons of solids per 24 hours. R—Ratio by weight: solution/solids. ... but if the smelter is best equipped to handle a 36% copper concentrate, then for milling purposes 36% copper may be considered the perfect grade.
The copper recoveries obtained in the mill-float stage were between 70 - 80%. In the second phase of the study, the flotation tailings were further milled to 90% passing 45 microns and floated. The cumulative copper recoveries increased markedly to over 90%, which represents a significant improvement in comparison to the recoveries obtained ...
This study aims to investigate the ball milling effect on particles flotation using fractal dimension, in which the calculations in the particles morphology has been …
Cumulative copper recovery vs. flotation time for flotation tests with ore milled with mild steel media (MS) (dashed lines) and stainless milling media (SS) (solid lines) with 50 g/t copper sulphate added as specified (CuSO 4). The markers show the experimental values and the lines show the calculated values using the first order rate …
1. Introduction. Wet milling in ball mills followed by flotation is the general practice employed in the beneficiation of copper sulphide ores in which the major …
Figure 151 is the flow sheet of one section of the Cananea Consolidated Copper Co. mill as it was in 1929. This is a simple straight-flotation process that replaced an earlier combined gravity and bulk-flotation method. Table 58 summarizes the differences between results obtained from the earlier and later methods.
Fig. 1 shows the recovery vs. time of the copper, nickel and iron sulphide minerals obtained for the condition of SS milling media with no copper sulphate addition and illustrates the different performance of the minerals. It can be seen that chalcopyrite (copper) was the fastest floating mineral and achieved the highest final recovery …
The article describes the studies into sulphide extraction from ore using an integration of flotation and oxidized copper leaching in the conditions of milling with …
However, it might also be applied to small higher-grade deposits in remote or politically high …. (a) For copper there are advantages and disadvantages to using heap leaching versus milling, flotation, and smelting. The decision will depend upon both the type and size of the ore body. Under what circumstances might heap leaching be the ...
Champion and other mines with this ore type used flotation. The hypothesis re acceptable coarse particle recovery for the amygdaloid ores vs. conglomerate ores was combination of grain size and liberation considerations. Benedict, C.H., Milling Method And Cost At The Conglomerate Mill Of The Calumet & Hecla Consolidated Copper Co., IC 6364, 1930.
1. Introduction. Wet milling in ball mills followed by flotation is the general practice employed in the beneficiation of copper sulphide ores in which the major minerals of commercial significance typically are chalcopyrite (CuFeS 2), bornite (Cu 5 FeS 4), covellite (CuS) and chalcocite (Cu 2 S). The flotation response of ground minerals can …
The problem that most flotation operators have in learning their job (after reading the Job Description) isn't with the flow sheet or the mechanical equipment. It is how to recognize the effects that the variables have on each other. The main operating tool that any operator has to use is their own five senses and a healthy dose of curiosity.
Flotation. Milling and grinding. 1. Introduction. Slags that are produced from smelting of both ferrous and non-ferrous metal ores and concentrates together with other …
This study aims to investigate the ball milling effect on particles flotation using fractal dimension, in which the calculations in the particles morphology has been made using the step-length method. The ore sample of under-investigation was a copper ore. The examined parameters include grinding time, ball load, and solid weight …
Flotation might yield a smaller plant, but losses from "oxide" (= non-sulphide copper) might be too high. Got to do test work and evaluation to answer properly. Cite
In most plants engaged in the flotation of ores containing copper-bearing sulphide minerals with or without pyrite, pine oil is employed as a frother with one of the xanthates or aerofloat reagents or a combination of two or more of them as the promoter. Lime is nearly always used for … See more
Recovery of copper in concentrates from slags cooled in the induction furnace and ground for 30 minutes ranged from 87.1 to 96.2 percent with the best recovery obtained on the highest grade slag sample. Copper …
Three different milling time of copper ore in laboratory ball mill was applied. The flotation results were presented as the recovery-recovery and grade-recovery upgrading curves. The liberation of sulphides and the particle size of sulphides in flotation product were analysed and compared. Download Free PDF.
Crushing and Grinding. You will note that the Oracle Ridge project has utilized a two-stage crushing circuit with a double acting jaw crusher and cone crusher. In …
Copper 3.78%. Sulphur 42.38%. Zinc 12.45%. Gold 0.01 oz/ton. Iron 32.84%. Silver 1.50 oz/ton. Insoluble 8.50%. In order to meet smelter requirements it is desired to produce at least a 20% copper concentrate with not over 8% zinc. The copper is present principally as chalcopyrite in extremely close association with both the sphalerite …
