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Nickel is an important strategic metal produced at over 2 million tonnes annually [1]. ... Pyrometallurgical smelting and refining is the dominant method of extracting Ni from sulfide concentrates [14, 15]. ... The Cu concentration in the generated sulfide is 0.9–1.2 wt%, which is close to that in the FeNi ...
Evaporative crystallization was carried out at 50 °C using the synthetic nickel sulfate solution with concentrations reported in Table 1. The major impurities are magnesium (0.87 g kg −1), copper (0.21 g kg −1), and zinc (0.55 g kg −1). As shown in Table 2, the concentration of nickel in the solution increased with the progression of ...
Owing to its precious value and high toxicity, nickel recovery from wastewater is a worthwhile work. However, the concentration of Ni 2+ varies from tens to thousands of mg/L due to different wastewater sources, no process can simultaneously meet the requirements of metal recovery and water reuse, both for high concentration …
Nickel is a chemical element present in trace amounts in natural water samples, is possible to find very low nickel concentration levels in river waters, in the …
Nickel Concentration in Soils. Nickel comprises approximately 3% of the earth's crust composition and is the twenty-fourth most abundant element (Hemantaranjan 2014). ... The DTPA method is the most used and effective for a variety of soils. However, standards for Ni-deficient soils have not been established. Nickel deficiency can occur because ...
The best method to enrich the laterite ore is found to be hydrocycloning after grinding and then flotation of underflow after further grinding. With this method 60% of Ni is recovered with 3.3% Ni grade in concentration and 1.3% Ni …
It should be added that segregation of laterite ores prior the flotation process has shown some improvement in upgrading nickel. The segregation process relies on the addition of calcium chloride or sodium chloride and carbon allowing the formation of nickel and iron chlorides at temperatures between 900 and 1150 °C. Iwasaki et al., (1961) and …
In the present study, the feasibility of the real-time quantification of nickel, cobalt, manganese, and lithium concentration is investigated using Ultraviolet–Visible spectroscopy as a replacement for the conventional method to measure the concentrations of these elements in battery and other applicable industries.
This paper examines the effects of different physical methods on pre-concentration of nickel in laterite ores. The effect of ore mineralogy on choosing the best strategy to upgrade nickel will be discussed. The findings of this project will help to unlock a substantial volume of nickel with significant value from laterite ores.
The concentrate obtained at 60 °C and 1.25 M oxalic acid concentration contained 3.2% Ni (∼10% NiC 2 O 4 ·2H 2 O) and 3.5% Fe with a corresponding concentration ratio of 4.05, enrichment ratio of 3.44 and nickel recovery of 84%. The proposed method appears to provide a promising prospect for exploiting low-grade …
In order to determine the concentration of airborne nickel at workplaces, defined air volumes are drawn through a cellulose membrane filter by means of a dust collector. The exposed filter is mineralized with acid. The nickel concentration is determined by means of flameless atomic absorption spectrometry according to the …
The difference in Fe concentration between sample and bracketing standard may cause instrumental mass bias and inaccurate Fe isotopic data [9]. It is therefore recommended that standard and sample concentrations should be similar (within ~10%) to avoid artefacts in Fe isotopic analyses by the solution method [12].
Despite being a well-recognized method for process control in the industry, it is a less effective procedure due to the significant time lag between the sampling, analysis, and corrective feedback [3]. In addition, the process is time- ... measure nickel concentration ≥30 g L–1 with the UV–Vis technique. Cobalt: ...
The nickel recovery reached 96.43% at a concentration of sulfuric acid of 1 M. Furthermore, after extract purification, nickel recovery reached 50.61%, which was achieved at an optimum pH of 3.2.
The system allows the determination of nickel with a limit of detection (LOD) of 0.75 μg L −1 and a limit of quantitation (LOQ) of 2.50 μg L −1. The precision was expressed as a relative standard deviation (RSD) of 3.4 and 3.8% for a nickel concentration of 20.0 and 50.0 μg L −1 respectively. The value of 78.0 was determined …
Nickel is titrated with EDTA against murexide. At the beginning of the titration solution should have low ammonia concentration, increased near the end point. This procedure enhances color change at the end point. Reaction between EDTA and Ni2+ions is relatively slow, so titration … See more
Nickel (Ni) from low grade laterite nickel ore can be extracted by the leaching method, using sulfuric acid. Unfortunately, the Caron and High-Pressure Acid Leaching (HPAL) processes are suitable only for ores with low magnesium and/or silicate content such as limonite.
measure nickel concentration ≥30 g L–1 with the UV–Vis technique. Cobalt: Similar to nickel, samples with different concentrations of cobalt were prepared and the absorbance …
Nickel concentrates may be leached with sulfuric acid or ammonia, or they may be dried and smelted in flash and bath processes, as is the case with copper. Nickel requires higher smelting temperatures (in the range of 1,350 °C [2,460 °F]) in order to produce an artificial nickel-iron sulfide known as matte, which contains 25 to 45 percent nickel.In the next …
Nickel plating is carried out at a pH range of 1.5 to 6.0, with the majority of solutions operative between 2.0 and 4.5. The concentration of nickel in rinse waters following nickel plating varies widely, depending on the method to minimize drag-out and whether flowthrough or countercurrent rinsing is used.
The effect of various parameters such as concentration, path length, number of elements in the solution, density, and pH was analyzed to verify the feasibility. The obtained …
The concentration of nickel in solution was determined by using the dimethylglyoxime spectrophotometric method based on the National Standard GB/T 11910-1989. The tests were performed on a 721 visible light spectrometer (Shanghai Jinghua, China) using wavelength of 530 nm and dimethylglyoxime as the chromogenic reagent.
This method can be used with personal or stationary sampling to determine the mean concentration of nickel and its inorganic compounds at workplaces over the sampling …
1. Prepare a 300 mg/L nickel standard solution as follows: a. Use a pipet to add 15 mL of a 1000 mg/L nickel standard solution into a 50-mL volumetric flask. b. Dilute to the mark …
Decomposition Method" at the end of this document) Figure 1. Microwave carousel and vessels. The lid torque tool is labeled A. NOTE: Label tape must NOT be applied directly to the Teflon vessel, but should be used on the fiber vessel sleeves. 1. Accurately weigh three 1.0 to 1.2-g samples of the dried unknown into clean, dry Teflon PFA
The method was based on similar earlier work that evaluated Ni and Cu lability by ... Nickel concentrations in diatom soft tissue and diatom biogenic silicate were determined for three species of ...
Volume 275, 5 July 2022, 121170. Determination of dissolved nickel in natural waters using a rapid microplate fluorescence assay method. FabienRobert-Peillarda, El …
The concentration of copper in the purging solution of the electrodeposited copper–nickel anode is only 0.08~0.16 mol/L, which does not meet the requirement for the electrolysis method. In addition, electrolysis is performed with difficulty since electric current efficiency is quite low (only 70%).
The proposed method was used for the simultaneous determination of Cu(II) and Pd(II) in water and various synthetic alloy samples with different concentration ratios of Cu(II) and Pd(II) with good ...
In summary, nickel-rich oxide LiNi 0.87 Co 0.06 Mn 0.07 O 2 cathode material with concentration gradient of transition metals was successfully prepared via a novel particle size-controllable calcination method. The shell layer with low nickel content was formed by a dry mechanofusion process, through which the inefficient co …
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