34 research outputs found
Flotation and adsorption studies of chalcopyrite with cupferron
Flotation tests were conducted in a Hallimond tube on chalcopyrite, with a collector system of cupferron and fuel oil. The reagent concentration, pH and conditioning time were studied as variables. The necessity of the fuel oil was verified by conducting experiments without it. Contact-angle measurements have been conducted by the captive bubble technique. From the results it was found that fuel oil is necessary to promote adhesion of the conditioned mineral particles to the air bubbles. Adsorption experiments were carried out in a column apparatus under similar conditions as in flotation, except
for the addition of fuel oil. The adsorption density and flotability were high at weakly acidic range where the reagent complexes the metal ions effectively in an aqueous medium
Electroflotation-A critical review
Problems related to processing of fine particles and separation of minerals by electro-flotation was described
Studies on ammoniacal leaching of copper oxide minerals
Aqueous ammoniacal leaching of an oxidized copper ore from the mines of M/s Hindustan Copper Limited : Malanjkhand are reported. Factors which influence copper recovery such as ammonia concentration, solid-liquid ratio, particle size and agitation have been studied at ambient temperature. Over 90% copper extraction could be achieved at 1.5 mo1ar concentration of ammonia, 10% solids
and at a stirring speed of 550 Min- . A kinetic study of the process indicated a mixed control reaction mechanism. The copper ammine solution obtained in the leaching step was subjected to precipitation by stripping of the ammonia at different temperatures and air flow rates. The kinetic treatment of the data obtained on preci[litation process revealed that the decomposition reaction is controlled by chemical reaction control. The precipitated product analysed 75% Cu with a recovery of 80-85% copper
Separation of minerals by electroflotation
Bench scale experiments were conducted to study the separation of chalcopyrite fines. Three different electroflotation cells were designed and beneficiation response of chalcopyrite was investigated.Electrolytic oxygen bubbles were found to have significant influence on the beneficiation of chalcoyrite.High enrichment ratio of chalcopyrite was observed by column cum electroflotation method using diethyldithiocarbamate as collector
Beneficiation of Low Grade Ores by Electro-Column Flotation Technique.
Three types of flotation columns were developed with a column dia of 8.0 cm and a length of 160 cm. The first type consists of an ordinary column fitted with a porous plate at the bottom. The second type consists of
two electrodes at the bottom to obtain very
fine and uniform bubbles generated electrolytically
and the third is a combination of first and second types, i.e. to get both electrolytic bubbles and air from the compressor through porous plate. Three different ores
were tested-gold tailings for recovery of scheelite, copper tailings (chalcopyrite) and oxide copper ore. In the case of scheelite and copper oxides, good results were obtained with the first type of column itself, whereas
the third type column was found fairly effective in the recovery of chalcopyrite. The variables like the effect of reagent concentration, column height above the feed point, feed flow ra te, current density, air flow rate, particle size were examined
Studies on the beneficiation of copper oxide minerals
Bench scale experiments on the beneficiation of copper oxides were conducted using different chelating agents, viz. Cupferron, 8-Hydroxyquinoline, a-Benzoin oxime and sodiumdiethyldithiocarbamate. Among the four collectors tried, diethyldithiocarbamate was found to be effective in achieving good recovery and grade. Also the consumption of the reagent was less compared to other collectors. All the collectors have exhibited excellent selectivity towards
copper and fairly good concentrate was obtained. Adsorption studies revealed that the adsorption of the collector on the mineral surface follows a true
chemical reaction. Investigation on the nature of complexation with diethyldithiocarbamate has indicated that each copper atom on the surface will be complexed with two diethyldithiocarbamate molecules. Variables like
reagent concentration, pH of the pulp, impeller speed, etc. were studied
Flocculation of iron ores using magnafloc polymers
Flocculation of iron ore fines using two different anionic polymers based on polyacrylamide.The results obtained were presented
Zeta potential and flocculation behavior on iron ore fines using magnafloc polymers.
The flocculation behavior of iron ore fines using Magnafloc polymers as flocculants was studied along with zetapotential measurements.Correlation between zetapotential data and flocculation was examined and discussed.The mechanism of flocculant adsorption on mineral surface was suggested
Studies on the Flotation of Mixed Oxide-Sulphide Ores of Copper from Malanjkhand Deposit India.
Bench scale experiments on the benefition
of a mixed oxide-sulphide ore of copper from Malanjkhand deposit of Hindusthan Copper Limited, India conducted with certain modifications in collector systems within the limits of existing plant operating conditions yielded better metallurgical results. Sodium isopropyl xanthate (IPX) and sodium diethyldithiocarbamate (DTC) were tried as collectors along with modifiers, such, as, sodium silicate,Magnafloc guargum, and were optimised. All the variables such as concentration, pH of the slurry were stematically studied. Improved metallurgical results were obtained with isopropyl xanthate in combination with sodium silicate guargum at pH 9.0. The results were
also equally good with dithiocarbamate,a chemisorbing collector
Cold bonded pelletization of iron ore fines
Cold bonding processes have been developed with
a view to conserve energy in pellet hardening step.
The incorporation of the reductant and fluxes in
the pellet also ensures a blast furnace burden
that is hanogeneous with resultant smooth operations
of the furnace. The present paper deals with
the studies conducted on tha production of ccmposite
iron are pellets using iron are fines, leco char.
hydrated lime and natural silica flour as
well as rice husk silica. The results indicate
that the composite pellets with rice husk has
superior strength compared to the pellets with
natural crystalline form of silica. Studies on
CaO-HZD-rice husk silica reaction systffil revealed
that a gel like calciun silicate hydrate (CSH-I)
is formed during the steaming operation that is
responsible for the strengthaning of the composite
pellet. The studies on the kinetics of the hydrothermal
reaction revealed that the reaction is diffusion controlled and the product fanned is calcium silicate hydrate. The reducibility studies indicated good reducibility with minimun swelling