Principles of pyro-hydrometallurgical processing of quartz-leucoxene concentrate with the formation of a pseudobrukite phase

2021 ◽  
pp. 33-38
Author(s):  
E. N. Kuzin ◽  
N. E. Kruchinina ◽  
A. B. Fadeev ◽  
T. I. Nosova
Keyword(s):  
Hydrometallurgical Processing

scholarly journals Behavior of copper and lead during mineralurgical and hydrometallurgical processing of flash smelting slag

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Krzysztof Gargul ◽  
Bożena Boryczko ◽  
Andżelika Bukowska ◽  
Adam Hołda ◽  
Stanisław Małecki ◽  
...  
Keyword(s):  
Reduction Process ◽  
Copper Slag ◽  
Original Method ◽  
Flash Smelting ◽  
Sieve Analysis ◽  
Selective Enrichment ◽  
Hydrometallurgical Processing ◽  
Useful Components ◽  
Smelting Slag ◽  
The Many

AbstractThere are only a few smelters processing copper concentrates directly into blister copper. Despite the many advantages of this process, a serious challenge of this technology is the need to process the resulting flash smelting slag. It contains 12–15% copper and 2.5–4% lead. In this form, it cannot be considered as waste material and, therefore, a high-temperature reduction process is carried out. This decopperization process is energy- and time-consuming. The use of mineralurgical and hydrometallurgical processes, selective enrichment of the appropriate slag fractions in copper and lead, followed by its hydrometallurgical processing and recovery of Cu and Pb could be an interesting supplement to the methods used so far. The article presents results of research on the possibility of separation of useful components from copper slag using the original method of sieve analysis, gravitational enrichment and magnetic separation. Preliminary results of tests were made on a laboratory scale. Then, selective leaching of copper and lead from flash smelting slag was carried out, obtaining very promising results.

Review of the hydrometallurgical processing of non-sulfide zinc ores

2014 ◽  
Vol 149 ◽  
pp. 153-167 ◽  
Author(s):  
E. Abkhoshk ◽  
E. Jorjani ◽  
M.S. Al-Harahsheh ◽  
F. Rashchi ◽  
M. Naazeri
Keyword(s):  
Hydrometallurgical Processing

Iron Oxidation and Jarosite Precipitation in a Continuous Two-Stage 70°C Archaeal Bioreactor

2015 ◽  
Vol 1130 ◽  
pp. 230-233
Author(s):  
Anna H. Kaksonen ◽  
Christina Morris ◽  
Jason Wylie ◽  
Jian Li ◽  
Kayley Usher ◽  
...  
Keyword(s):  
Iron Oxidation ◽  
Volume Index ◽  
Redox Potentials ◽  
Continuous Stirred Tank Reactor ◽  
Two Stage ◽  
Dominant Form ◽  
Stage Design ◽  
Hydrometallurgical Processing ◽  
Co Precipitation ◽  
Cstr System

This study is the first demonstration of a continuous culture bio-catalysed iron oxidation and jarosite precipitation reactor using thermophilic archea, for use in hydrometallurgical process flow sheets. A two-stage continuous stirred tank reactor (CSTR) system comprised of two CSTRs, each with its own settler, was operated for biological iron oxidation and precipitation at 70°C. The two-stage design was to allow the growth of microorganisms that prefer various redox regimes. The bioreactors were inoculated with a mixed culture of extreme thermophilic iron oxidisers from genera Acidianus, Metallosphaera and Sulfolobus. The influent (pH 1.5) contained (g L-1) 15 Fe2+, 1.5 Cu, 1.5 Ni (all as sulfates), nutrients and trace elements. At a hydraulic retention time (HRT) of 6-7 h in each CSTR, the overall iron oxidation rate was 1.0±0.1 g L-1 h-1 and percent 97±2%. The pH values were 1.38±0.16 and 1.57±0.05, and redox potentials (Ag/AgCl reference) were474±47 mV and 575±1 mV, in CSTR1 and CSTR2, respectively. The percentages of influent Fe, Cu and Ni removed as precipitates from settlers were 52%, 0.46% and 0.03%, respectively. The precipitates were comprised of jarosite (100%), potassium jarosite being the dominant form (38-51%), followed by hydronium (30-35%), ammonium (13-18%) and sodium jarosites (6-9%). The precipitates had a sludge volume index of 5.8-19 mL g-1, indicating good settling properties facilitating easy removal through settling. The simultaneous and instantaneous addition of contaminants (g L-1: 2.0 Al, 0.05 As, 0.05 F, 0.2 Co, 5.0 Mg and 0.4 Mn), potentially contained in hydrometallurgical processing streams, into the influent decreased the iron oxidation (50% overall oxidation with HRT of 26-29 h in each CSTR) and jarosite content in precipitates (85-87%). In conclusion, the two-stage high-temperature CSTR system allowed iron oxidation and precipitation of the oxidised iron in the form of well settling jarosite with only minor loss of Cu and Ni via co-precipitation. However, the bioreactor performance was hampered by the introduction of other transition metals, fluoride and arsenic.

Understanding the behaviour of zinc and impurities during alkaline leaching of zinc bearing product obtained as a result of pyrometallurgical processing of ferrous metallurgy dusts and examining the phase composition of leaching residue

2021 ◽  
pp. 52-58
Author(s):  
P. A. Kozlov ◽  
A. M. Panshin ◽  
S. A. Yakornov ◽  
D. A. Ivakin
Keyword(s):  
Phase Composition ◽  
Alkaline Medium ◽  
Selective Dissolution ◽  
Cement Industry ◽  
Alkaline Solutions ◽  
Iron Compounds ◽  
Pyrometallurgical Process ◽  
Hydrometallurgical Processing ◽  
Hydroxo Complexes ◽  
Leaching Residue

This paper describes a technique developed for processing EAF dusts and recovering zinc. The technique is based on the Waelz process without zinc sublimation and allows to obtain a product suitable for hydrometallurgical processing and clear of lead or halogens in one process stage. It would be feasible to use an alkaline hydrometallurgical process for this product as it enables a selective recovery of zinc while iron remains in the solid residue. A pyrometallurgical process is necessary to remove halogens, increase the solubility of zinc and remove lead. In the alkaline process, the latter transfers to the solution together with zinc. As part of the development procedure, the thermodynamics of lead and iron in alkaline medium was studied. For this, equilibrium diagrams were built in the Eh – рН coordinates. Findings: – zinc can dissolve at рН > 12.7 while forming the following anions: ZnO22– and [Zn(OH)n]2–n. A study that looked at leaching zinc ores confirms that anions of the latter type do form; – lead can dissolve while forming [Pb(ОН)6]2–-type hydroxo complexes at рН > 12.5. When the solution is heated to 80 oС, their solubility can reach 140 g/dm3. In a hot solution hydroxo complexes form orthoplumbite and orthoplumbate ions PbО22–, PbО32– as a result of dehydration; – the low solubility of all iron compounds in alkaline medium and their position in the diagram only defined by the pH range suggest that the leach solutions contain no iron ions of any type. With the temperature raised to 80 oС, the equilibria in the Fe – H2O system remains unchanged in alkaline medium and no significant increase in the solubility of iron compounds is observed. The findings show that selective dissolution of products containing zinc oxides (including EAF dusts after the above mentioned pyrometallurgical process) in alkaline solutions is feasible. The zinc leaching residue was analyzed for chemical and phase composition to find possible applications for it. It is demonstrated that calcium ferrites, aluminates and alumosilicates account for 80% of the residue. This iron-calcium material can be utilized by cement industry.

Sign in / Sign up

Export Citation Format

Share Document