قائمة الطعام
However, when the sulfuric acid concen- tration raises from 0.86 mol/L to 1.10 mol/L, Mn leaching efficiency decreases slightly from 97.19% to 95.67%, while Fe leaching effi- ciency continues to ...
This work, therefore, addresses the leaching of a zinc silicate concentrate in sulphuric acid. The effects of particle size (0.038–0.075mm), temperature (30–50°C) and initial acid ...
The roasting and leaching behavior of spodumene in sulphuric acid process was investigated. Thermal analysis results of ore sample showed that the peak temperature of crystal conversion was 1006 ...
In this work, previously produced black mass was treated in sequence by milling, water leaching, and sulfuric acid leaching. Two goals were set: first, whether milling, with reductive additives, could impart reductive phase changes which would allow Li extraction to water in the water leaching; second, co-leaching of the black mass with …
1st step: water-washing (leaching with water) of the EAF dust in order to remove the chloride ions and also as much of the calcium contained as possible in order to avoid overconsumption of sulphuric acid. 2nd step: leaching of the washed dust with sulphuric acid at 25 °C, in order to leach the easily dissolved free zinc oxide.
The objective of this review is to give a comprehensive insight on the production of the alumina from thermally or mechanically activated clays and coal fly ash …
Abstract and Figures. In this study, extraction characteristics of Cu, Co, Zn and Fe from copper converter slag by oxidative leaching with potassium dichromate–sulphuric acid lixiviant were ...
Phase Transitions in the α–γ–β Spodumene Thermodynamic System and Impact of γ-Spodumene on the Efficiency of Lithium Extraction by Acid Leaching. Heat-treatment of spodumene concentrate at 1323 K (1050 °C) for 30 min …
It dissolves during leaching and. re-precipitates as alunite. 5. Diffusion of sulphuric acid through the limonite pores seems to be the rate-control-. ling step of the reaction. The grain model is ...
Abstract. Sulphuric acid pressure leaching of limonitic laterites is the process of choice to recover nickel and cobalt from equatorial lateritic ores, replacing the energy intensive pyrometallurgical methods. This process achieves a high nickel and cobalt extraction (more than 95%) with a high selectivity due to simultaneous iron and …
The results showed that leaching of about 99% of nickel content of the washed tailing could be achieved using 4.0 mol sulfuric acid, pulp density of 1/20 gmL −1 and particle size of −180 +250 mm at 80 °C after 240 min. Kinetic analysis of the leaching data properly followed the shrinking core model, and the dissolution rate of nickel was ...
Sulfuric acid leaching of copper rich slag with the optimized parameters can provide a copper rich process solution with iron as the main impurity metal. The …
In many studies in the literature, sulfuric acid and hydrochloric acid are the most preferred for leaching in acidic environments [ 32, 33, 34, 35, 36 ].
pr ese nce of 0. 2 g/l MnO 2 could result in uranium leaching. effi cien cy of about 87%. The leachin g kinetic s of ura-. nium showed that the rate of ur anium leaching using. sul phur ic acid in ...
This review examines the atmospheric leaching (AL) of nickel laterite ores with sulphuric acid, specifically the limonite, smectite (clay) and saprolite fractions. The kinetics and mechanism of leaching of the key minerals are reviewed together with methods for enhancing nickel recovery.Existing and developing AL processes for …
Copper smelter flue dust is a residue, rich in zinc, originating from the pyrometallurgical process of copper, and constitutes a potential raw material for zinc production. In order to valorise this waste by hydrometallurgical processes, its leaching with sulphuric acid at constant pH is studied. Experimental conditions (temperature, pH, and ...
The acid leaching was also utilized to recover iron from RM by the organic acids (such as H 2 C 2 O 4 ) or inorganic acids (such as HNO 3, HCl, H 2 SO 4 and H 3 PO 4 ) (Agrawal et al., 2018a ...
Maximum Zn leaching efficiency reached 83.81% at 30% solid, 22.05wt% sulphuric acid concentration, 45 °C, leaching time = 2 h as well as particle size of 300 µm (d 80). In this condition, the ...
Cobalt was only found to exist in the manganese structures of the. lateritic ore. During sulphuric acid pressure leaching of laterite at 230 –. 270 °C and an acid to ore ratio of 0.2 –0.25 ...
However, while Walter and Verner (1963) used a concentrated acid leach following pre-leaching, Donati et al. (2014) used a sulfuric acid bake at 250–300 °C followed by water leaching. Approximately 85% of the niobium, 75% of the tantalum, 90% of the rare earth elements and 99% of the uranium dissolved during the acid bake/leach …
Highlights Leaching temperature, leaching duration, sulfuric acid to ore weight ratio and particle size of the limonitic nickel laterite ore were studied. Optimum parameters determined as 255 o C, 0.30 sulfuric acid to ore weight ratio, a particle size of −850μ, 1 h of leaching duration with 30% w/w. 87.3% of Ni and 88.8% of Co in the …
In many studies in the literature, sulfuric acid and hydrochloric acid are the most preferred for leaching in acidic environments [32,33,34,35,36]. It is stated in the literature that the consumption of sulfuric acid, which is the cheapest solvent for leaching of oxidized copper ores [ 37 ], varies between 0.4 and 0.7 tons H 2 SO 4 per ton of ...
Combination of hydrogen peroxide (H 2 O 2) and sulfuric acid (H 2 SO 4) was utilized as the leaching solution, where various acid concentrations, solid-to-liquid ratios, leaching...
The reductive acid leaching of manganese from a manganese-zinc ore using hydrogen peroxide and sulphuric acid was recently investigated by Qian et al. (2017). A maximum of 95.73% of Mn and 99.18% of Zn were recovered at room temperature after 2 h leaching time in the presence of 2.16 M sulphuric acid and 1.28 M hydrogen peroxide, …
Nitric acid and Nitrates: The oxidizing action of nitric acid and nitrates can be utilized to leach sulphides, but this is seldom adopted because of costs. 4. Concentrated sulphuric acid: Most sulphides are oxidized to sulphate. From the sulphated ore, all of the zinc, copper and iron can be leached with water while lead, silver, gold and ...
Several leaching studies about lateritic nickel extraction have been performed using different solutions, such as sulphuric acid111213 14 021, hydrochloric acid [2,15,2223242526 nitric ...
The leaching system sulphuric acid/hydrogen peroxide was investigated in more detail, with focus on the optimisation of rhenium extraction and its effect on the extraction efficiencies of the ...
The possible mechanism of leaching the sulfuric acid roasted concentrate is mostly a complicated process of H 2 SO 4 ionization, ... Selective removal of impurities from rare earth sulphuric liquor using different reagents. Miner. Eng., 127 (2018), pp. 238-246, 10.1016/j.mineng.2018.08.007.
The results show that soluble metal sulfates, such as rhomboclase and mikasite, were formed in the baked samples, and that the leaching of valuable metals (Fe, Cu, Zn, and Pb) was accelerated …
Leaching of WPCBs using inorganic acids generates acidic solutions of metals as their halide, sulfate, or nitrate complexes that can be separated from each other by well-established solvent extraction processes [40].An important aspect of solvent extraction is the development of highly selective reagents that can transport single …
حقوق النشر ©2000- 2024 شركة شنغهاي زينيث
