The abatement of SO 2 and the utilization of copper tailings are identified as two attention-attracting environmental issues in the copper smelter. In this study, to improve the flue gas desulfurization performance and the utilization of copper tailings, SO 2 removal from smelting flue gas by using copper tailings combined with MnSO 4 ·H 2 O …

Flotation tailings are by-products of coal preparation plants, which do not only occupy cultivated land but also cause pollution. The high ash content and low calorific value of tailings limit their applications. Deashing is the precondition for the reutilization of flotation tailings. However, it is more difficult to remove ash content from flotation …

The maximum electrosorptive removal of Cr(VI) and F were found to 97.1% and 94.20% for 10 mg/L at optimized flow rate 16 mL/min and 1.2 V. Effective regeneration electrode was observed after ...

The aim of this paper is the assessment of Donnan dialysis coupled to adsorption process for the removal of chromium from aqueous solutions. This study was conducted in order to benefit...

The main objective of the present study is to develop artificial neural networks (ANN) to predict the adsorption efficiency of multi-walled carbon nanotubes (MWCNTs) on Cr(VI) removal. Polydisperse MWCNTs were synthesized at 750 °C on alumina supported Fe-Co-Mo catalyst using CVD (chemical vapor deposition)-assisted …

The optimization of adsorption of chromium on activated carbon was carried out to ensure a high adsorption efficiency at low adsorbent dose and high initial concentration of Cr(VI). While the goal of adsorption of chromium optimization was to improve adsorption conditions in batch process, i.e., to minimize the adsorbent dose and …

The removal of chromium (VI) from aqueous solutions by Donnan dialysis has been investigated in this paper. In this process, two anion-exchange membranes (AEMs) were …

Donnan dialysis is one of the membrane processes. It is based on the cross-exchange of ions having the same electric charge through an ion-exchange membrane. The removal of boron by Donnan ...

complete recovery of metals [12]. Hereafter, froth flotation, as explored in aforemen-tioned studies, can be the more suitable approach to recover Cu from the tailings. One source of the largest quantities of mineral resources is tailing pond of the Erdenet mine, operating for 44 years. The tailing pond covers a total area of 18.6km2 as of

The effects of parameters such as adsorbent dosage, concentration of chromium ion (Cr-VI), pH, and contact time were studied to optimize the maximum removal of Cr(VI).

The residual collector in the flotation tailing may have environmental consequences since it may causes groundwater contamination as a result of improper design of the tailing dam. Furthermore, the process water recycled from the tailing dams may have detrimental effects on the flotation selectivity because of the many dissolved …

49.2.1 Preparation of Chromium Solution and Analytical Methods. All the chemicals used are analytical grade. A stock solution of Cr (VI) is prepared by dissolving 2.8287 g of 99.9 % potassium dichromate (K 2 Cr 2 O 7) in 1,000 mL of solution.This solution is diluted as required to obtain the standard solutions containing 20–60 mg/L of Cr (VI).

Large-scale application of filled coal mining technology has long been limited by conditions such as the cost of filling. Compared to traditional filling materials, coal flotation tailing filling materials (CFTFM) offers advantages such as low cost and excellent performance. The Box–Behnken response surface method was used to investigate the …

Optimization of Chromium (Vi) Removal by Donnan Dialysis. American Journal of Analytical Chemistry. Vol.4 No.6 (2013), Article ID:33433,8 pages DOI:10.4236/ajac.2013.46039. Optimization of Chromium (Vi) …

The optimization of adsorption of chromium on activated carbon was carried out to ensure a high adsorption efficiency at low adsorbent dose and high initial concentration of Cr(VI). While the goal of adsorption of chromium optimization was to improve adsorption conditions in batch process, i.e., to minimize the adsorbent dose and …

The present study deals with the application and the optimization of the Donnan dialysis in the removal of chromium (VI) from a reconstituted …

The results of MT reverse flotation using 10 % alkanes of various chain lengths and 200 g/t collector feed are shown in Table. 8. MT direct reverse flotation shows a moderate removal of siliceous vein stones from the tailings, resulting in only a 2.61 % improvement in concentrate grade.

In the adsorption process, the reduction of Cr(VI) to Cr(III) by Fe(II) promoted the removal of hexavalent chromium. The Cr(VI) will be attracted by protonated oxygen functional groups through ...

Wastes originating from copper mining, particularly generated during the ore enrichment process constitute a considerable percentage of industrial wastes in Poland, which theoretically are supposed to provide a raw material base but remain wholly unmanaged. Wastes from copper flotation are deposited on the waste dumps which …

Abstract. Removal of Cr (VI) from aqueous solutions using biochar from sugar beet tailing (SBT) was investigated as a function of pH, contact time, and biochar mass via batch experiments. The surface characteristics of SBT biochar before and after Cr (VI) sorption was investigated with scanning electron microscopy equipped with energy ...

This work aims to compare a biosorption method (BM) and a coagulation–dissolved air flotation method (C/DAFM) as inexpensive and effective means of eliminating hexavalent chromium (Cr[VI]) from industrial wastewater.Synthetic wastewater containing 1000 mg L −1 chromium was used for the experiments. The effect of different parameters (initial …

1. Introduction. Heavy metal ions pose a grave threat to both living organisms and the environment due to their persistence and toxic properties. These ions, including lead, mercury, chromium, cadmium and arsenic, find their way into ecosystems through various industrial processes, mining activities and improper disposal of waste [1], [2].Once …

PDF | The removal of chromium (VI) from aqueous solutions by Donnan dialysis has been investigated in this paper. In this process, two anion-exchange... | Find, …

Chromium (Cr) is a typical non-biodegradable heavy metal 1.In nature, chromium mainly exists in the form of Cr(III) and Cr(VI) 2.It is widely used in various industrial processes, such as ...

To remove chromium(VI) from water waste the coagulation and dissolved air flotation are used in a combined form with ferric chloride and poly aluminum chloride in the form of coagulant (Esmaeili ...

The second-order regression model was developed to predict the removal efficiency using Design Expert software. The optimal conditions to remove Cr from aqueous solution at constant temperature of 30°C and stirring speed of 250 rpm were found to be contact time 62.5 min, pH 1.96, initial Cr (VI) concentration 145.4 mg/L, and resin dose …

Pyrite flotation separation and encapsulation in tailings dams is proposed as a viable way to chemically stabilize tailings. Characterization of potential acid mine generation in tailings led to an innovative process in which acid-generating pyrite is separated by flotation from the coarse tailings and incorporated into the slime zone. …

3.1 Characterization of Adsorbent. Figure 1a depicts the X-ray diffraction patterns of NLAC and NLAC/Fe 2 O 3 composite. The peaks of NLAC were present at 24.5°, 28.6°, and 43.3° respectively. The peaks at 24.50° and 28.61° represented the independent liquid phases connected to the graphite structure, whereas the peak at …

The open-circuit flotation concentrate has a Sn grade and recovery of 12.01% and 40.59%, respectively, indicating the excellent flotation separation of cassiterite from its associated gangue minerals.

The uptake of chromium (VI) per weight of adsorbent increased with increasing initial chromium (VI) concentration up to 240-480 mg/L, and decreased sharply with increasing adsorbent concentration ...