A two-stage roasting under similar conditions improved zinc recovery to 85%, while the dissolution of iron remained low (3%). INTRODUCTION Sulphation roasting of complex sulphide ores or concentrates combined with hydrometallurgy is of great interest to industry as a possible means of con- trolling SO2 emissions.
Through sulfidation roasting of ZLR with pyrite, zinc and iron were converted into ZnS and Fe 3 O 4 . The effects of pyrite dosage, roasting temperature and roasting time on the sulfidation of zinc in ZLR were investigated. The results showed that the sulfidation percentage of zinc reached 91.8% under the optimum condition.
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Another aspect of the sulphation roasting process is its suitability for smaller, pocket and complex deposits with less air pollution due to fixation of sulphur with metal.
The direct sulphation of individual and mixed sulphides of copper and iron has been studied using a steam–oxygen mixture as the oxidant. The investiga…
Temperature ranges of sulphatizing roasting and necessary amounts of Fe2(SO4)3 and FeSO4 for sulphation of zinc and copper were calculated by thermodynamic software HSC Chemistry 9.9.
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The conversion of the ore into its corresponding oxide can be done by Calcination or Roasting. Calcination is done for carbonate ores (in absence of air) and roasting is done for sulphide ores (in presence of air). Zinc sulphide ZnS is known as Zinc blende, and it is the Sulphur S containing ore of the metal.
Recovery of nickel from a PNG nickel laterite with high content of iron by a sulphation roasting-water leaching has been studied. The influences of sulfuric acid/ore ratio, temperature of roasting and water on recovery efficiency were investigated.
Sulfatization roasting of refractory copper-zinc sulphide raw material is studied. Test material chemical and phase compositions are examined. Thermodynamic calculations of possible sulfatization reactions are performed. Phase transformations, mechanisms of decomposition, and oxidation of sulphide minerals are studied using …
Roasting roast product which is approximately 78.6% of the ore concentrate ys employs excess amount of air since the roasting reactions are carried out in the solid state at high temperature.
Semantic Scholar extracted view of "Sulfation roasting characteristics of copper‐bearing materials" by M. Ozer et al.
The sulfidation roasting behavior was analyzed in detail to reveal the reaction mechanism. Information about the sulfidation reaction, including phase …
Zinc plant residue (ZPR) is a secondary material generated during hydrometallurgical zinc production that contains considerable contents of valuable elements such as Zn, Cu, Fe, Pb, Cd, Ag, In, Ga, Tl. Zinc, copper and accompanying elements in ZPR are in different minerals, mainly in the ferrites. A promising approach for recycling …
Sulfidation is a widely used technology to improve the floatability of oxidized metal minerals or to stabilize the heavy metals in various wastes. The sulfidation mechanism of ZnO with pyrite was...
Sulfation Roasting. Sulfation roasting has been used as a selective method for the extraction of metals from primary sources such as the extraction of nickel from laterite ores . The concept of this method is to form a soluble sulfate species of one component while leaving the other in an insoluble form.
Sulphation roasting offers the potential to simultaneously extract valuable metals from multi-metal sulphide minerals . In this study, the influences of roasting temperature and sodium sulphate addition on the sulphation of valuable metals were investigated under isothermal condition in a static air atmosphere.
The average crystal size of ZnS obtained was 2.63 µm under the optimal condition and its existence as both sphalerite and wurtzite was confirmed. The flotation tests performed indicated that zinc sulfides produced could be separated from the treated slag. ... Zinc recovery from franklinite by sulphation roasting. Ya-li Zhang Xian-jin Yu Li ...
Based on the results of time-resolved XRD analysis and synchronous thermal analysis (STA), a mechanism of the sulfation roasting was elucidated. The rate-controlling step of zinc and copper sulfation process during the ZPR roasting was estimated.
Sulfation roasting followed by water leaching process was used to extract lithium from lepidolite. Various parameters including roasting temperature, the amount of additions, and solid/liquid ratio in leaching process were optimized.
In this paper, formation of zinc sulfide species during roasting of ZnO with FeS 2 was investigated and its contribution on flotation was illustrated. The evolution …
Recovery of copper from smelting slag by sulphation roasting and water leaching 411 Materials and experimental methods Experiments were conducted using a ...
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In roasting, air in large amounts, sometimes enriched with oxygen, is brought into contact with the sulfide mineral concentrate. This is done at elevated temperatures when …
The leaching behavior of metals from a nickeliferous limonitic laterite ore was investigated by high pressure acid leaching process for the extraction of nickel and cobalt.
Lecture 19: Roasting of zinc and lead concentrates ... On roasting Zn oxidizes to ZnO, iron to Fe and S to SO of ZnS however, remains unchanged. ...
In sulphation roasting of ZnS products are
It is shown that factors associated with conditions whIch are thermodynamically favourable for the formation of CuS04 in roasting lead to high copper recoveries on leaching. One of these factors is the ratio of the air to solids used for roasting. This can be varied widely without loss of temperature control in the sulphating roasting of many Australian copper …
Recovering zinc and silver from zinc acid-leaching residue was investigated in this study. The process of sulphation roasting, water leaching, silver chlorination leaching, PbCl 2 crystallization and lead replacement was used.
The XRD patterns of roasting products prepared at 950 °C for 0–2 h are shown in Fig. 3.It can be seen that weak peaks of ZnO and ZnS appeared, although the mixture of zinc ferrite and pyrite was roasted at 950 °C for 0 h.The peaks of ZnS corresponded to two different ZnS configurations, including zinc blende and wurtzite, …