The invention provides a leaching method of an anode material of a used nickel cadmium battery, which comprises the following steps: placing the anode material separated from the used nickel cadmium battery into a container resisting corrosion of sulfuric acid and nitric acid, then sealing the container, pumping the sulfuric acid and the nitric ...
Sulfuric acid leaching studies [41] show that up to 99.5% Cd and up to 96% Ni can be recovered from the powder of spent Ni-Cd batteries containing about 69% Ni, 15% Cd, and 0.94% Fe by leaching ...
The utilization of laterite sulfuric acid leach residue has always been a challenge in the metallurgical industry. The current treatment involves deep-sea landfills, which leads to considerable environmental pollution and resource wastage. In this work, an effective method is proposed to recover iron and chromium from sulfuric acid leach residue. The …
Kinetics of sulfuric acid leaching of cadmium from Cd–Ni zinc plant residues
Selective and collective acid leaching is done to recover cadmium, zinc, nickel, lead and copper by H 2 SO 4 0.82 M 14, 97% of cadmium was obtained from 8% (v/v) of H 2 SO 4 8% (v/v) leaching 15 ...
The simulated acid rain with the pH of 3.2 ± 0.05 was prepared using the mixture of sulfuric and nitric acid. The eluting amount of the simulated acid rain for 1 day was determined according to the rainfall in 1 month in Hengyang city, Hunan Province, 2018. The simulated acid rain was added continuously using a peristaltic pump for 12 days.
The zinc plant purification cake (CINKUR Co., Turkey) was leached with hydrochloric acid. The extraction and concentration of cadmium from this acidic leach solution by an emulsion liquid membrane ...
A maximum cadmium recovery of 95% was obtained by leaching with 1.7 M sulfuric acid for 15 min at 25 °C with 1/8 solid/liquid ratio agitated at 400 rpm. The results showed that it is possible to separate copper and lead from Cd–Ni zinc plant residues through selective leaching.
composition, the fume may have to be roasted with or without sulfuric acid or oxidized using sodium chlorate or chlorine in order to convert cadmium into a water- or acid-soluble form and to eliminate volatile constituents. However the leach solution is obtained, it must generally be purified to remove arsenic, iron, copper, thallium, and lead.
In this research, the dissolution kinetics of cadmium from Cd-Ni residues produced in NILZ plant has been investigated. Hence, the effects of temperature, …
Approximately 85.4% of cadmium in the residues was extracted at the sulfuric acid concentration of 1.5 M after 15 min and increased to 93.6% after 30 min. The …
The purpose of this work was to evaluate the reductive leaching process of the ZNLR with sulfur dioxide as reducing agent in the sulfuric acid system. The …
The studies showed the selective extraction of copper after iron precipitation from the sulfuric acid leach solution of e-wastes containing 0.92 g/L Cu and minor impurities with 2-hydroxy-5-nonylacetophenoneoxime (LIX 84) above pH 2.0 in single stage. Further, extraction of zinc, nickel and cadmium was carried out using Cyanex 302.
Cadmium and Zinc: Cadmium and zinc extractions wore also dependent on acid availability and are shown in Figure 2. Extractions exceeded 90 pct at higher acid-to-dust ratios. ... Therefore, the leach can be accomplished using this waste bleed stream as a source of sulfuric acid. Optimum Leach Conditions: Maximizing copper and arsenic …
A significant amount of iron from the waste nickel-cadmium (Ni-Cd) battery sulfuric acid leachate seriously hinders the separation and recovery of nickel and cadmium. Therefore, an efficient and economical way to remove iron from this leachate is desired. This paper demonstrated the efficient iron extraction from a simulated Ni-Cd …
The PLS as derived from the column leaching tests was very acidic (pH was close to 0). Taking into consideration the chemical composition of PLS (see Table 1) and the initial addition of sulfuric acid, it was calculated that the residual acidity was equal to 1.4 mol H + /L. In order to remove the residual acidity and raise the pH of the PLS solution to …
The process will be for sulfuric anodize @ 150-220 g/l. Normally I would leach the tanks with 1-2% sulfuric acid, and try to get some heat to it, 140 °F if/when possible. What are some options used in the industry? I thought about 35% hydrogen peroxide @ 1-2 mls/litre to add to the sulfuric.
Reductive acid leaching of cadmium from zinc neutral leaching residue using hydrazine sulfate. ... in the leach liquor and the volume of leach liquor (L), respectively; m is the mass of ZNLR (g); and w is the mass fraction of the metal in ZNLR (%). ... After leaching 120 min using sulfuric acid only, 42.28% of Cd and 64.02% of Zn …
Environmental sciences. Abstract. This study is focused on the optimization of effective parameters on Cadmium and Zinc recovery by atmospheric acid leaching of low-grade waste by response...
Table of Contents Arsenic, copper, and molybdenum were effectively removed from arsenic-bearing flue dust using a three-stage continuous sulfuric acid leach. Leach conditions to maximize arsenic and copper extraction while minimizing bismuth extraction were determined: 25-wt pct H2SO4, 20- to 25-wt pct solids, a leach temperature of 55° C, and …
The SO2 offgas is stripped of all entrapped dust and other impurities and then converted to sulfuric acid in an acid plant. Hydrometallurgical process; In the hydrometallurgical process, zinc, copper and cadmium are dissolved in the sulfuric acid leach of the roasted zinc ore. The copper and cadmium are among the most common interfering ...
Semantic Scholar extracted view of "A sustainable approach for advanced removal of iron from CFA sulfuric acid leach liquor by solvent extraction with P507" by Lijuan Wang et al. ... A significant amount of iron from the waste nickel-cadmium (Ni-Cd) battery sulfuric acid leachate seriously hinders the separation and recovery of nickel …
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 …
The extraction of Ga(III) with various extractants from sulfuric acid leach liquor of zinc refinery residues was reported by Nusen [22]. More than 99% of Ga(III) was extracted after a single contact at pH 3.5 with the organic system consisting of 0.2 mol/L 5,8-diethyl-7-hydroxy-6-dodecanone oxime and 0.2 mol/L neodecanoic acid in ShellSol …
It is found that leaching rates of cadmium and zinc both exceed 99 % in a very short time, but for copper, leaching rate of 99 % is achieved under the optimized …
The dissolution kinetics at 25-55 degrees C and t
In dry air Cd reacts very slowly with H 2 S forming CdS. The reaction increases with increasing moisture in the air [5]. Cd (s) + H 2 S (g) CdS (s) [yellow] In strong acids like HCl and H 2 SO 4, Cd 2+ is precipitated by H 2 S as CdS. It should be noted that the precipitate is not pure but a mixture of CdS-CdCl 2 or CdS-CdSO 4.The H + to Cd 2+ ratio has a …
This work proposes a synergistic process for co-recovery of Sc by using the acid titanium white waste acid (TWWA) to leach the basic red mud, to which the acidity was adjusted with concentrated ...
The filter cake leaching with water or sulfuric acid is performed to selectively dissolve soluble cadmium to the highest content (as much as possible) to …
Updated March 13, 2018. By Emily Jacobson. Chlorine bleach is a solution of sodium hypochlorite and water. Chlorine gas is produced when sulfuric acid is mixed with chlorine bleach. This reaction is a function of the …
ABSTRACT Indium and zinc extractions from zinc neutral leach residue were investigated with sulphuric acid and sulphur dioxide. Sulphur dioxide maintained a low concentration of Fe3 ... Kinetics of sulfuric acid leaching of cadmium from Cd-Ni zinc plant residues. M. Safarzadeh D. Moradkhani M. Ojaghi-Ilkhchi. Chemistry, Environmental …
and recovery of iron from the waste Ni-Cd battery sulfuric acid leachate. Keywords: waste nickel-cadmium batteries; saponified D2EHPA; extraction of iron; iron oxalate 1. Introduction Nickel-Cadmium (Ni-Cd) batteries are widely used in rail transit, aircraft, and power grid energy storage due to their stable performance, long life, and fast ...
SX flow sheet for recovery of cadmium, cobalt and nickel from sulfuric acid leaching of Ni–Cd–Co-containing residues of spent rechargeable batteries, ... (0.5 mol/L) diluted in Solvesso 150 was used to separate cadmium and zinc from a sulfate leach solution of cadmium cementation sponge in batch and continuous mode in a mixer …
The enrichment of valuable metals from sulfuric acid leach liquors of various nickeliferous oxide ores has been investigated. ... Benfalvi was able to precipitate over 90 % of cadmium as CdS in a ...
The leach solution contains cadmium along with other metallic constituents such as nickel, zinc etc. depending on waste material treated. ... The sulfuric acid (H 2 SO 4) and ammonium hydroxide solutions were used in order to maintain desired equilibrium pH of the solution during extraction. All chemicals used were of analytical grade reagent ...
Abstract. Solid residues from hydrometallurgical zinc plants contain high concentrations of heavy metals such as zinc, cadmium and nickel, and these residues are considered as hazardous waste. Recovery of cadmium from this waste using sulfuric acid leaching has been studied. It was found that the cadmium extraction rate increased by …