In the scale-up study, 3 batches of eleven WPCB plates at a time were studied and an average 168 ± 1.3 g copper was recovered at the end of the process, which corresponds to 99% leaching. The recovered copper was precipitated from the leachate by the cementation process using iron scrap and almost 99% copper was recovered after …
In this study, the dissolution conditions and dissolution kinetics of copper from malachite in the presence of organic acid (C4H6O6) as an organic leaching reagent were examined. The effects of particle size, acid concentration, time, solid/liquid ratio, temperature, and mixing speed on the dissolution process of copper were investigated. …
The kinetics of cementation of copper on iron, from sulfate solutions has been studied using a rotating disc geometry. The influence of initial copper ion concentration in solution, rotational speed of the disc, temperature and ... obtained by acid leaching of …
Ultrafine copper powders have been recovered from spent etching solutions of printed circuit boards by cementation on helical-form iron scrap chips. The tested …
Cementation of copper onto iron is a historically old process for recovery of copper from leach solutions. Although about 13 percent of the Nation's primary copper …
The kinetics of cementation of copper on iron, from sulfate solutions has been studied using a rotating disc geometry. The influence of initial copper ion concentration in solution, …
The use of galvanic interactions between zero-valent aluminum (ZVAl) and activated carbon (AC) to recover gold (Au) ions is a promising technique to overcome the challenges due to the poor recovery in ammonium thiosulfate systems, but the applicability to practical Au ore processing remains elusive so far. The present study describes (1) …
Cementation of copper from zinc containing copper solutions using metallic zinc was studied in this work. ... The leaching rate of zinc and iron is 92.66% and 94.67% when sulphation roasting ...
Stirring or circulation shortens the cementation time and favors the decrease of iron etching. Copper cementation can be realized effectively using either of the two methods tested: (1) An intense and continuous overturning of scrap iron pieces together with the solution in a rotating drum type reactor to provide the maximum contact of the ...
They proposed cementation with iron to obtain pure bismuth. The bismuth obtained from this method had a purity of 90 %. Ha et al. ... According to these results, the recovery efficiency in this leaching process for copper is 40.36 %, iron 38.43 %, sulfur 22.4 %, arsenic 97.88 %, zinc 38.3 %, bismuth 98.33 %, and lead 45.99 % was obtained. ...
The apparent activation energies for zinc, iron, and copper are 56 kJ/mol, 56 kJ/mol, and 50 kJ/mol, respectively. Characterization of the leaching residues and determination of iron and copper species in the leaching solution showed galvanic corrosion took place between zinc ferrite and copper, enhancing their acid dissolution.
Therefore, a process has been proposed for simultaneous up-gradation of molybdenum oxide and recovery of copper using controlled sulphuric acid leaching and cementation by scrap iron. The molybdenum oxide containing 70.00% MoO 3, 2.49% Cu 2 O, 1.97% Fe 2 O 3 and 11.22% SiO 2 obtained after roasting of molybdenite …
By contrast Table 2, Figs. 2 and 3 show that the leaching of Zn, Cu and In is more efficiency in the atmospheric leaching than the oxidative pressure leaching. There is little difference between the atmospheric leaching and oxidative pressure leaching for the precipitation rate of Fe, As and SiO 2.Therefore, atmospheric leaching is chosen for the …
The kinetics of copper cementation during atmosphere leaching of a Ni-Cu matte in CuSO4-H2SO4 solution was studied as a function of initial copper ion concentration, initial add concentration ...
It was found that continuous rotation of pieces of iron together with waste copper sulphate solution or intense circulation of the solution along through motionless iron pieces (e.g. scrap...
On the other hand, optimum conditions of cementation by iron powder were resulted at more than 95% with a pH of 3, 45 degrees Celsius, 1 hour and 1.5 times more than the stoichiometric equation of required iron powder amount to precipitate copper. Keywords Leaching, Cementation, Copper Oxide, Malachite, VMS Copper Deposit 1.
Leached copper can be recovered by iron cementation by forming the copper oxide i (Cu 2 O). ... For to know the particles size effect on the copper leaching, three granulometric portions were studied in experiments: (i) particles < 90 µm, with a metal particle release level of 70 % to 76 %; (ii) particles 90–355 µm with a metal particle ...
Request PDF | On Jul 1, 2024, Francis O. Konaté and others published Leaching of base metals in PCBs and copper cementation by iron powder | Find, read and cite all the research you need on ...
that copper, zinc cementation was more e˜ective than iron and aluminum cementation [15]Demerican et˚al. inves-tigated the kinetics study of copper-zinc metal cementa-tion in aqueous solutions. They determined the e˜ect of copper, zinc and ammonium chloride concentration, agita-tion speed, pH and temperature on copper cementation.
However, during cementation of copper with iron, the recovery of economically valued metals such as zinc from the solution is difficult since the solution contains high iron concentration ...
The cementation of copper using iron is a well soda ash followed by sulphuric acid leaching and selective adsorption known process for the recovery of copper from the solution (Lung, of molybdenum with activated charcoal (Singh et al., 1988; Junea 1986).
Therefore, a process has been proposed for simultaneous up-gradation of molybdenum oxide and recovery of copper using controlled sulphuric acid leaching and cementation by scrap iron. The molybdenum oxide containing 70.00% MoO 3, 2.49% Cu 2 O, 1.97% Fe 2 O 3 and 11.22% SiO 2 obtained after roasting of molybdenite …
The present study is undertaken to investigate the effectiveness of process variables, namely: initial copper concentration, temperature, pH and flow rate on the …
Cementation of copper onto iron is a historically old process for recovery of copper from leach solutions. Although about 13 percent of the Nation's primary
The use of galvanic interactions between zero-valent aluminum (ZVAl) and activated carbon (AC) to recover gold (Au) ions is a promising technique to overcome the challenges due to the poor …
However, during cementation of copper with iron, the recovery of economically valued metals such as zinc from the solution is difficult since the solution contains high iron concentration. Therefore, the recovery of zinc as a side product from zinc rich oxidized copper ores with weak character leaching reactants such as ammonium …
DOI: 10.1016/0304-386X(86)90025-3 Corpus ID: 95715235; The history of copper cementation on iron — The world's first hydrometallurgical process from medieval China @article{Lung1986TheHO, title={The history of copper cementation on iron — The world's first hydrometallurgical process from medieval China}, author={T. N. Lung}, …
The performance of a rotating fixed bed reactor in recovering copper from industrial waste solutions by cementation is studied under various conditions. The rotating fixed bed is made of stacked woven steel screens to take advantage of two features of screens: the ability to present large area per unit volume and their ability to promote …
From the leach liquor composition, it was observed that the leach liquor contained around 90% of copper. For cementation studies, iron powder was used at a stoichiometric ratio of 1:1. ... Guo S, Ye C 2016 Leaching of copper from metal powders mechanically separated from waste printed circuit boards in chloride media using …
Cementation of copper onto iron is a historically old process for recovery of copper from leach solutions. Although about 13 percent of the Nation's primary copper production is from cementation, …
In this study, the effects of various experimental parameters on the cementation yield of copper by iron were investigated statistically. A statistical experimental design based on the second-order central composite rotatable design (CCRD) was planned fixing the cementation period at 2. h.. The experimental design was done …