Dispersion effect on a lead–zinc sulphide ore flotation (original) (raw)
Related papers
Flotation of oxidized zinc ore without desliming
Mining, Metallurgy & Exploration, 2010
To increase zinc recovery in the concentrate, this investigation performed mineralogical characterization, dispersion studies, bench and pilot-scale flotation experiments and an industrial flotation trial. The objective was to verify the flotation behavior of the silicate zinc ore (calamine type) in the presence of slimes, with the aid of dispersing agents. Characterization studies identified the major minerals in the flotation feed as hemimorphite (calamine), quartz and dolomite. Dispersion tests showed that enhanced dispersion of the particles in the pulp in the absence of reagents occured at a pH range between 8.5 and 12.0. Bench-scale flotation experiments were planned using the statistical tool of complete factorial design at two levels, replicated once. These experiments showed, and were confirmed at the pilot-plant scale, that higher doses of sodium sulfide and polymeric dispersant combined with sodium silicate favored a higher metallurgical recovery. At 6,800 g/t (218 oz/st) sodium sulfide and 6,992 g/t (224 oz/st) polymeric dispersing agent combined with sodium silicate, a zinc grade of 38.4% in the final concentrate was achieved, at an average metallurgical recovery of 72.4%. The industrial trial confirmed the pilot scale results, leading to zinc recovery of 76.1% and a 37.3% zinc grade in the concentrate.
Minerals Engineering, 2011
In this study, the influences of important factors on smithsonite flotation are investigated. Dosages of sulphidizing agent and collector, desliming prior to flotation and the use of sodium hydroxide instead of sodium carbonate as the pH regulator are essential to the effective recovery of smithsonite in cationic flotation. The appropriate temperature for flotation was found to be 30-40°C. Sodium hexametaphosphate (SH) and sodium silicate had the greatest selectivity between smithsonite-calcite and smithsonitequartz, respectively. The results of oleic acid flotation showed that the grade and recovery of zinc were relatively low in comparison with the sulphidization-cationic flotation method. Despite using sodium silicate and SH as depressants in oleic acid flotation, flotation was not selective. Flotation using mixed collectors (Armac C + Potassium Amyl xanthate) showed promising results. The ratio of the mixed collectors and the sequence of addition of mixed collectors were important criteria in attaining true mixed collector flotation.
Flotation of Aladagˇoxide lead–zinc ores
Oxide lead–zinc ore sample containing 10.17% Pb, 10.98% Zn, 57 g/t Ag and 164 g/t Cd was subjected to this experimental study and taken from Kayseri located in the foothills of the Aladag ˘ Mountains, Turkey. Preliminary flotation tests with the ore sample indicated that there was no selectivity in terms of zinc recovery; therefore studies were concentrated on producing lead concentrates. In the experiments, the effects of different parameters such as number of stages, amount of Na 2 S, amount of ZnSO 4 and application of gravity concentration prior to flotation were investigated in relation to the metal contents of concentrates and flotation efficien-cies. A lead concentrate with 65.42% Pb was produced with 77% recovery as a result of six stage flotation experiment carried out with 350 g/t KAX, 250 g/t Aero 407 and 4500 g/t Na 2 S and 98.7% of zinc remained in the tailings with 12.23% Zn content. As a result of gravity concentration followed by flotation, a lead concentrate with an average Pb content of 65.80% was produced with 86.5% total Pb recovery. In both cases almost all zinc remained in the tailings and could not be recovered by the addition of different reagents due to its complicated mineralogical structure. Therefore, application of metallurgical processes is proposed for zinc recovery from the tailings.
Estimation of Reagent Consumption in Lead Flotation of a Zinc Leach Residue
Canadian Metallurgical Quarterly, 2005
Recovery of lead from a zinc leach residue of an oxidic ore was investigated using the sulfidization-flotation method on a laboratory scale. The residue was leached to eliminate its soluble compounds. The sulfidization-flotation experiments were carried out on a bench scale and different parameters such as sodium sulfide, collector concentration and pH were examined. Finally, the sodium sulfide and collector concentration resulting from the batch flotation were compared with the one estimated using the microflotation results in literature. Résumé-On a étudié la récupération du plomb à partir d'un résidu de lessivage du zinc d'un minerai oxydé en utilisant la méthode de sulfuration-flottation à l'échelle du laboratoire. On a lessivé le résidu pour éliminer ses composés solubles. On a effectué les expériences de sulfuration-flottation à l'échelle du laboratoire et l'on a examiné différents paramètres comme le sulfure de sodium, la concentration du collecteur et le pH. Finalement, on a comparé le sulfure de sodium et la concentration du collecteur résultant de la flottation en discontinu avec les valeurs estimées en utilisant les résultats de microflottation de la littérature.
The effect of the dispersion degree on the floatability of an oxidased zinc ore
Minerals Engineering, 1994
Most of the Brazilian zinc deposits consist of the so-called "calaminic" ores (silicates and carbonates). Considering that the Italian reserves at Sardinia are now exhausted, the ores dS'otn Vazante -MG may be considered unique. Earlier studies of microflotation in a modified Hallimond tube indicated that the dispersion degree of the pulp should control the flotation behaviour of these ores. Dispersion tests were then performed in a sedimentation tube with samples of calaminic zinc ores from Mineracao Areiense. Bench scale flotation testlvork was catT"ied out under the best dispersion conditions, following traditional cationic flotation. The major objective of the present investigation was the establishment of correlations between slurry dispersion, desliming and flotation. It was verified that an adequate slu~?y dispersion is not enough for a high selectivity, a combination of desliming and dispersion being required. The pelformance of the dispersing agents and the magnesium grade in the concentrate depend on the pulp percent solids. The most ~cient dispersing agents were determined for the three samples under in vestigation.
Designing Flotation Process for Lead-Zinc orefrom Nepal
2000
The paper deals with the development of a process based on froth flotation for the concentration of a lead-zinc ore from Ganesh-Himal region of Nepal. A detailed chara-cterisation and flotation studies were carried out under the varying process conditions. The ore was predomionantly made up of sphalerite and pyrite in association with sub-ordinate amount of galena, minor amount of pyrrhotite and chalcopyrite with dolomite as the major gangue. Under the optimum process conditions the rougher lead and zinc recovery were 96.3% and 90.8% respectively. Regrinding followed by three stage cleaning of the lead rougher conc-entrate resulted in cleaner concentrate assaying 79.11 % Pb with 83.4% recovery. Similarly two stage cleaning of the zinc rougher concentrate produced cleaner concentrate analysing 60.08% Zn with 80.4% recovery. Based on the studies undertaken a process flow-sheet for the conc-entration of the ore to individual lead and zinc concen-trates has been recommended.
Flotation of zinc oxide ore using cationic and cationic-anionic mixed collectors
Fizykochemiczne Problemy Mineralurgii - Physicochemical Problems of Mineral Processing
Flotation of smithsonite coming from a cerussite flotation circuit was investigated using Armac C and Armac T as cationic collectors and their mixtures with potassium amyl xanthate (KAX) as an anionic collector. Under optimum condition using Armac T with sodium hexamethaphosphate as a de-pressant, a smithsonite concentrate with 42% Zn and 89.6% recovery is obtained while in the presence of sodium silicate depressant Armac C produces a concentrate containing 40.8% Zn with 92.5% recovery. However, Armac T acts a little more selectively than Armac C but their mixture with KAX act inversely. The KAX-Armac C mixed collector improves the Zn grade and recovery of the flotation concentrate while KAX-Armac T does not. At the mixture ratio of KAX - Armac C 2:1, the amine collector consump-tion is decreased and an optimal concentrate with 94% recovery and 43% Zn grade is obtained without any gangue depressant reagents.
Flotation of Aladag oxide lead-zinc ores
Minerals Engineering
Oxide lead–zinc ore sample containing 10.17% Pb, 10.98% Zn, 57g/t Ag and 164g/t Cd was subjected to this experimental study and taken from Kayseri located in the foothills of the Aladağ Mountains, Turkey. Preliminary flotation tests with the ore sample indicated that there was no selectivity in terms of zinc recovery; therefore studies were concentrated on producing lead concentrates. In the experiments, the effects of different parameters such as number of stages, amount of Na2S, amount of ZnSO4 and application of gravity concentration prior to flotation were investigated in relation to the metal contents of concentrates and flotation efficiencies. A lead concentrate with 65.42% Pb was produced with 77% recovery as a result of six stage flotation experiment carried out with 350g/t KAX, 250g/t Aero 407 and 4500g/t Na2S and 98.7% of zinc remained in the tailings with 12.23% Zn content. As a result of gravity concentration followed by flotation, a lead concentrate with an average Pb c...
Fresenius' Journal of Analytical Chemistry, 1998
A procedure for zinc flotation separation from fresh water prior to its determination by atomic absorption spectrometry (AAS) has been developed. Hexamethyleneammonium hexamethylenedithiocarbamate (HMA-HMDTC) added to the first precipitate collector of hydrated Fe(III) oxide (Fe 2 O 3 · xH 2 O) gives the second precipitate collector of Fe(HMDTC) 3 . After addition of a surfactant, the precipitate of collectors is separated from the water phase by a stream of air bubbles, dissolved by strong acid and the solution then tested by AAS. The experimental parameters (amount of collector used, pH, ionic strength, type of foaming reagent, ζ potential, induction time etc.) affecting the flotation efficiency were optimized. At a pH of 6, Zn is separated quantitatively (98.5%) by addition of 5 mg Fe(III) and 3 mL 0.1 mol/L HMA-HMDTC to the sample. Results are compared with those obtained by ammonium tetramethylenedithiocarbamate.
Collectorless Flotation of Lead and Zinc Sulphide from Derek�y Ore Deposite
2002
A study on collectorless flotation of lead and zinc sulphide present in the Derekoy ore in the presence of sodium sulphide was performed. The parameters of the process and influence of sodium sulphide, zinc sulphide, conditioning time, pH and cleaning of concentrate were investigated. The results were compared with collector added flotation using several types of collectors.