Simulation of a grinding circuit change to reduce lead sliming

Abstract Galena is the finest component of the product of a closed-circuit grind treating a lead-zinc ore, largely due to preferential recycling of this high-density mineral by the cyclone. For example, at the Pine Point Mines concentrator, for —55% -200 mesh over-all, the galena will be close to 95% -200 mesh. This sliming of the lead can limit recovery, selectivity and dewater-ing. A proposed circuit modification to reduce the sliming is to incorporate a unit cell. A simulator was constructed to study the No. 3 grinding circuit at Pine Point modified by a unit cell on ball mill discharge (BMD).The simulator used a cumulative size basis rate-of-breakage with plug flow ball mill model, the parameters being obtained by laboratory grinding tests. Flotation and the cyclone models used a cumulative recovery/size matrix. The behaviour of each mineral, galena, sphalerite, pyrite and calcite/dolomite, was simulated. Simulation was adapted to a programmable calculator. A close fit to the existing circuit performance at two tonnages and mineral mixes was established.The simulator showed that the modified circuit could significantly coarsen the Pb grind, from 95% to —50% -200 mesh, depending on recovery, without substantially altering the size of the other minerals. The other principal findings were: compared to laboratory flotation tests on existing circuit BMD, the unit cell concentrate (CONC) will be coarser and markedly lower in grade; relatively low unit cell stage recoveries are desirable, because the cyclone scavenges the tail to give a circuit recovery which is higher than the unit cell stage recovery; unit cell stage recovery should not exceed the cyclone stage recovery, as the latter is the maximum circuit recovery; low unit cell stage recovery helps offset the disadvantage of the high flow at BMD; other high-density minerals will also be scavenged into the CONC, as illustrated by pyrite, making CONC quality difficult to maintain; density control of BMD flotation does not greatly alter feed density to the cyclone or ball mill.Possible plant metallurgy is forecast for a CONC diverted to final lead concentrate.
Keywords: Mineral processing, Simulation, Grinding circuits, Sliming, Lead sliming, Galena, Pine Point Mines Ltd., Ball mills, Cyclones, Flotation.
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Summary: This paper briefly describes the mining method proposed for the iron ore deposits in Wadi Shatti, western Libya. The iron ore produced will be used in the steel plant at Misurata on the Mediterranean coast.
Publication: CIM Bulletin
Author(s): M.K. ALY
Keywords: Open-pit mining, Wadi Shatti deposit, Iron ore, Libya, Selective mining, Non-selective mining.
Issue: 816
Volume: 73
Year: 1980
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Summary: This paper describes the main testing procedures that should be carried out to evaluate the capacity and capability of the service brakes on the large-size diesel-electric trucks now in common use at open-pit mining operations. Brake testing programs in general are described, and then consideration is given to different techniques of service brake testing, brake performance evaluation, braking energy and typical performance characteristics.
Publication: CIM Bulletin
Author(s): H. SAHAY
Keywords: Open-pit mining, Trucks, Haulage trucks, Brakes, Diesel-electric trucks, Braking energy, Maintenance.
Issue: 816
Volume: 73
Year: 1980
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Summary: The presence of excessive water in the Gibraltar East Stage 1 pit initiated studies into the ground-water conditions that might be expected in mining the Granite Lake and Pollyanna pits. Hydrologic information obtained from a pump test program in 1974 indicated that deep-well dewatering could be successfully achieved. In 1976, a deep-well dewatering system consisting of eight wells was installed on the periphery of the Pollyanna pit. It has been responsible for a significant decrease in...
Publication: CIM Bulletin
Author(s): T.L CARPENTER, R. YOUNG
Keywords: Open-pit mining, Dewatering, Deep-well dewatering, Gibraltar Mines, Water flow, Granite Lake pit, Polyanna pit, Pumping, Falling-head tests.
Issue: 816
Volume: 73
Year: 1980
Text
Summary: This paper describes mineral processing testwork on drill core samples from an ilmenite deposit in Terrebonne County just north of Montreal.Mineralogical examination showed that the intimate association between ilmenite and hematite precluded their separation. The maximum concentrate grade was therefore limited to 22.9% Ti. Liberation ofganguefrom the hemo-ilmenite grains occurred around 400 \>.m, a size which proved to be too coarse for recovery by flotation.Other physical separation...
Publication: CIM Bulletin
Author(s): G.E. AGAR, W.B. KIPKIE, V.K. DRYLIE
Keywords: Ilmenite, Laurentian Titanium, Titanium deposits, Mineral processing, Hematite, Grinding, Desliming, Flotation, Gravity separation, Jigging, Electromagnetic separation, Magnetic separation.
Issue: 816
Volume: 73
Year: 1980
Text
Summary: This paper describes the work undertaken to renovate the Pipe Open Pit drainage system, incorporating measures to improve effluent quality. It describes the technical feat of drilling an 11-inch-diameter hole from the bottom of the open pit for a distance of 1100 feet to intersect an underground drift. An innovative method of checking the inclination of this hole is also described. The paper outlines the construction required on the 1500-foot level of the underground mine to facilitate water...
Publication: CIM Bulletin
Author(s): R.G. ACHTER, E. WILSON
Keywords: Open-pit mining, Drainage systems, Pipe open pit, Effluent quality, Water flow, Drilling, Dewatering.
Issue: 816
Volume: 73
Year: 1980
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Summary: Quinsam Coal Ltd. is assessing the potential of developing a thermal coal deposit near Middle Quinsam Lake on Vancouver Island. The coal reserve outlined is classified as a high volatile, bituminous "A" steam coal and is composed of four separate seams of varying quality within the Late Cretaceous Comox Formation.Open-pit mining methods will utilize a walking dragline and a truck/shovel module as the primary stripping tools. Following washing and mechanical drying in a Baum jig...
Publication: CIM Bulletin
Author(s): DOUG BARNSTABLE
Keywords: Open-pit mining, Coal mining, Quinsam project, Comox Formation, Vancouver Island, Stripping, Draglines, Coal preparation, Transportation, Water management, Reclamation.
Issue: 816
Volume: 73
Year: 1980
Text
Summary: How well is the Canadian coal industry able to expand in the tough competition with other fuels in Canada and with other suppliers in the international, metallurgical and thermal coal trade? Coal production as a whole decreased between 1950 and 1960 and, although there has been a tripling of production since then, underground production continued to decrease until 1975. This trend has been reversed to a certain extent as a result of the modernization of mines in Cape Breton, but in 1978 over...
Publication: CIM Bulletin
Author(s): ERIC D. JAMIESON
Keywords: Coal mining, Coal production, Equipment, Productivity, Resources, Reserves, Coal demand forecasts.
Issue: 816
Volume: 73
Year: 1980
Text
Summary: The real cost of conversion from ore to semi-fabricated non-ferrous metals has been increasing for many years. Consumer resistance and improved knowledge and techniques now available justify investment in revolutionary as well as evolutionary methods of extraction. Metallurgical factors in current practice which preordain high production costs are identified as: smelters' demand for clean minerals, use of processes with low intensity of working per unit of reactor volume, use of low-velocity...
Publication: CIM Bulletin
Author(s): PHILIP M.J. GRAY
Keywords: Investments, Technology, Metallurgy, Non-ferrous metallurgy, Research, Cost increases, Extractive metallurgy, Leaching, Smelting, Refining, Volatilization, Thermal decomposition, Anodic dissolution, Flowsheet design.
Issue: 816
Volume: 73
Year: 1980
Text
Summary: Major rock slides in open-pit mines are rare, but they can develop in spite of sophisticated slope engineering design practice. Experience has shown that, except under high seismic load conditions, the serious slope instability condition is almost always accompanied by the gradual development of one or more tension cracks behind the slope crest, allowing for time-displacement monitoring. Continuous surface displacement measurements with attendant prompt analyses are usually adequate for the...
Publication: CIM Bulletin
Author(s): Z.M. ZAVODNI
Keywords: Open-pit mining, Slope failures, Kinematics, Rock mechanics, Kennecott Copper Corporation, Pit slopes.
Issue: 816
Volume: 73
Year: 1980
Text
Summary: A comparative study of sulphide textures has been carried out on samples from four Archean copper-zinc massive base metal sulphide deposits: Kidd Creek, Ontario; Lake Dufault -Norbec, Quebec; Hood River-41, N. W. T.; and Geco, Ontario. These deposits have undergone metamorphic recrystal-lization under a range of conditions, and results of this study indicate that certain sulphide textures may be used as qualitative indicators of metamorphic grade, whereas other cannot.The sulphide textures of...
Publication: CIM Bulletin
Author(s): C.J. ROCKINGHAM, R.W. HUTCHINSON
Keywords: Geology, Ore deposits, Metamorphic textures, Archean rocks, Copper deposits, Zinc deposits, Sulphide deposits, Massive sulphide deposits, Kidd Creek, Lake Dufault, Norbec, Hood River, Geco.
Issue: 816
Volume: 73
Year: 1980
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