Recovery of Silver from Zinc Acid-Leaching Residue by Flotation

2013 ◽  
Vol 392 ◽  
pp. 14-23
Author(s):  
Zhi Chao Yang ◽  
Ying Yong Ge ◽  
Yuan Long Zhang ◽  
Jun Li Zhao ◽  
Kun Zhu
Keyword(s):  
Ph Value ◽  
Influence Factors ◽  
Acid Leaching ◽  
Orthogonal Test ◽  
Pulp Density ◽  
Considerable Influence ◽  
Sodium Sulphide ◽  
Flotation Process ◽  
Flotation Recovery ◽  
Leaching Residue

Through flotation recovery of Silver (Ag) from Zinc acid-leaching residue (ZALR) was investigated in this study. The study adopted the single factor and orthogonal test reveal interactions among all considerable influence factors including sodium sulphide (SS) as regulator, ammonium butyl dithiophosphate (ABD) as major collector, GC as minor collector, interaction between ABD and GC, OC as flotation carrier, and pulp density. The experimental results show the flotation of the circuit composited of one rougher, one cleaner, one scavenger and middlings being back to the next rough flotation together is practical way and that the concentrate containing Ag 10890.0g/t, recovery77.43% can be obtained from the residue (Ag grade 340g/t). The optimum roughing flotation process is: the pH value of flotation pulp is 3.0~4.0, the pulp density is about 45wt.%, ABD dosage is 900g/t, GC dosage is 50g/t, OC dosage is 2000g/t, and BK201 dosage is 100g/t.

scholarly journals Selective Flotation of Elemental Sulfur from Pressure Acid Leaching Residue of Zinc Sulfide

Minerals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 89
Author(s):  
Guiqing Liu ◽  
Kaixi Jiang ◽  
Bangsheng Zhang ◽  
Zhonglin Dong ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Zinc Sulfide ◽  
Elemental Sulfur ◽  
Acid Leaching ◽  
Sulfur Pressure ◽  
Flotation Process ◽  
Return Water ◽  
Process Mineralogy ◽  
Leaching Residue ◽  
Pressure Acid Leaching ◽  
Mineralogy Analysis

An efficient flotation process was developed to selectively recover elemental sulfur from a high-sulfur pressure acid leaching residue of zinc sulfide concentrate. The process mineralogy analysis showed that the sulfur content reached 46.21%, and 81.97% of the sulfur existed as elemental sulfur which was the major mineral in the residue and primarily existed as pellet aggregate and biconical euhedral crystal. An elemental sulfur concentrate product with 99.9% of recovery and 83.46% of purity was obtained using the flotation process of one-time blank rougher, two-time agent-added roughers, and two-time cleaners with Z-200 as collector and Na2S + ZnSO4 + Na2SO3 as depressant. The flotation experiment using return water indicated that the cycle use of return water had no adverse effect on the flotation performance of elemental sulfur. The process mineralogy analysis manifested that main minerals in the residue directionally went into the flotation products. Most of elemental sulfur entered the concentrate while other minerals almost completely went into the tailing. Main valuable elements lead, zinc, and silver entered the tailing with sulfides and could be recovered by lead smelting. The proposed process can realize the comprehensive recovery of valuable components in the high-sulfur residue and thus it has wide industrial application prospect.

Flotation Desulfurization of High-Sulfur Bauxite with Ethyl Thio Carbamate as Collector

2011 ◽  
Vol 239-242 ◽  
pp. 1515-1519 ◽  
Author(s):  
Xiao Min Wang ◽  
Ting An Zhang
Keyword(s):  
Particle Size ◽  
Sulfur Content ◽  
Ph Value ◽  
Experimental Results ◽  
Pulp Density ◽  
Flotation Kinetics ◽  
Flotation Process ◽  
Flotation Agent ◽  
Kinetics Of

The desulfurization of high-sulfur diasporic bauxite （from China） with flotation process and ethyl thio carbamate as collector was studied, and the effects of flotation time, pulp density, pH value and particle size of ores were examined. The experimental results indicate that the sulfur in bauxite was successfully decreased through flotation. The sulfur content of bauxite was lowed to 0.66% under the condition of pH value 4, the dose of flotation agent ethyl thio carbamate 0.5kg/t, frother 20g/t, flotation time 15 minutes, pulp density 10%, the particle size of ores ≦0.09 mm, and the reclamation of Al2O3is 90.16% as well. The flotation kinetics of flotation desulfurization was also studied.

scholarly journals Recovery of Zinc and Silver from Zinc Acid-Leaching Residues with Reduction of Their Environmental Impact Using a Novel Water Leaching-Flotation Process

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 586
Author(s):  
Yunpeng Du ◽  
Xiong Tong ◽  
Xian Xie ◽  
Wenjie Zhang ◽  
Hanxu Yang ◽  
...  
Keyword(s):  
Hazardous Waste ◽  
Acid Leaching ◽  
Copper Recovery ◽  
Water Leaching ◽  
Flotation Process ◽  
Metal Levels ◽  
Valuable Metals ◽  
Leaching Experiments ◽  
Zinc Hydrometallurgy ◽  
Poor Stability

Zinc-leaching residue (ZLR) is a strongly acidic hazardous waste; it has poor stability, high heavy metal levels, and releases toxic elements into the environment. ZLR has potential as a valuable resource, because it contains elevated levels of zinc and silver. In this paper, the recovery of zinc (Zn) and silver (Ag) from ZLR wastes from zinc hydrometallurgy workshops using water leaching followed by flotation was studied. During water leaching experiments, the zinc and copper recovery rates were 38% and 61%, respectively. Thereafter, various flotation testing parameters were optimized and included grinding time, reagent dosages, pulp density, flotation time, and type of adjuster. Experimental results demonstrated this flotation method successfully recycled Ag and Zn. A froth product containing more than 9256.41 g/t Ag and 12.26% Zn was produced from the ZLR with approximately 80.32% Ag and 42.88% Zn recoveries. The toxicity characteristic leaching procedure (TCLP) results indicated the water-leaching flotation process not only recycled valuable metals such as zinc and silver in zinc-containing hazardous wastes but lowered the hazardous waste levels to those of general wastes and recycled wastes in an efficient, economical, and environmentally friendly way.

scholarly journals Extraction of tetracycline using the ionic liquid-based aqueous two phase systems: Single-stage versus multi-stage

2018 ◽  
Vol 24 (4) ◽  
pp. 387-397 ◽  
Author(s):  
Yi Liu ◽  
Li Chen ◽  
Jun Zhou ◽  
Zongcheng Yan
Keyword(s):  
Extraction Efficiency ◽  
Ph Value ◽  
Influence Factors ◽  
Volume Ratio ◽  
Line Length ◽  
Single Stage ◽  
Two Phase ◽  
Extraction Behavior ◽  
Multi Stage ◽  
Tie Line

Ionic liquids-based aqueous two-phase extraction (ILs-ATPE) offers an alternative approach to the extraction of tetracycline (TC) through their partitioning between two phases. Single-stage and multi-stage strategies have been evaluated and compared for the purification of TC using ATPE composed of 1-butyl-3-methylimidazolium halide ([Bmim]X(X=Cl,Br)) and K2HPO4. The influence factors on single-stage extraction behavior of TC were optimized systematically, including the pH value, tie line length, and volume ratio. The optimal extraction efficiency of TC could reach above 95% when the volume ratio is higher than 1.5 and the tie line length is 30.52%. The multi-stage ATPE was also investigated by simulating a three-stage crosscurrent operation in test tubes. According to the TC isotherm curve and respective McCabe?Thiele diagrams, a predicted optimized scheme of the countercurrent multi-stage ATPE was determined. TC can be purified in the IL-rich top phase with a final extraction efficiency of 99% and a final TC concentration of 0.25 mg/mL, if a three- -stage [Bmim]Cl-K2HPO4 ATPE with volume ratio of 0.5 and tie line length of 30.52% was employed. Thus, the multi-stage extraction with small volume ratio is necessary to achieve a higher recovery yield, resulting in the reduction of the IL consumption.

scholarly journals Utilization of slaked lime for the regulation of pH value in the process of copper

2009 ◽  
Vol 63 (1) ◽  
pp. 61-66
Author(s):  
Aleksandar Petkovic ◽  
Sonja Petkovic ◽  
Srdjana Magdalinovic
Keyword(s):  
Ball Mill ◽  
Ph Value ◽  
Gas Production ◽  
Flotation Process ◽  
Total Cost ◽  
Milk Glass ◽  
Slaked Lime ◽  
L Value ◽  
Flotation Concentration ◽  
Storage Place

The investigations of used lime at plant from company Messer-Tehnogas, Belgrade, were in the aim to improvement technologically results from flotation concentration of copper minerals in flotation plant Veliki Krivelj. This paper shows usage of slaked lime, which is waste in the process of technical gas production, for regulation of pH value in the process of copper minerals flotation concentration. It is important to point out that slaked lime is a waste material that is not dangerous. Preparation and dosage includes preparation procedures, which enable introduction into flotation process with the aim of achieving better results. Lime from Limekiln Zagradje is brought into four storage places in flotation. Volume of each storage place is 80 m3. Lime in pieces from storage place is added by airbladders on transportation line and by system of transportation lines lime gets to the ball mill. At the mill entrance water is added and then follows lime grinding. Milk glass of lime thus prepared goes to the pump basket from where is transported by pipeline to conditioner, and then by manual and (or) automatic valves it is dosed to the flotation concentration of copper minerals process. Prospect of advancement and rationalization of the used lime in flotation plant Bor, Veliki Krivelj and Majdanpek as well as a way to link different branches of industry was demonstrated. Total cost of lime supplying, transporting, preparation and distribution related slaked lime is lower for 2.955 din/kg. Particularly, using lime from Messer in content of 2.1 g/l value of pH 11.82 is possible to obtain.

scholarly journals Parametric optimization of cyanobacterial coagulation at exponential and decline phases by combining polyaluminum chloride and cationic polyacrylamide

2021 ◽  
Author(s):  
Weijun Song ◽  
Yu Xie ◽  
Xi Li
Keyword(s):  
Chlorophyll A ◽  
Parametric Optimization ◽  
Ph Value ◽  
Cyanobacterial Bloom ◽  
Influence Factors ◽  
Exponential Phase ◽  
Polyaluminum Chloride ◽  
Cationic Polyacrylamide ◽  
Removal Ratio ◽  
Decline Phase

Abstract Microcystis spp. is the most common and problematic species during cyanobacterial bloom. This study employed Microcystis aeruginosa for coagulation experiments. Effects of polyaluminum chloride (PAC), cationic polyacrylamide (CPAM), and pH value on cyanobacterial removal at exponential and decline phases by coagulation were investigated by measuring chlorophyll a. A mathematical model between factors and response variables was established using response surface methodology (RSM). Results showed that factors of CPAM dosage, PAC dosage, and pH value could strongly affect the removal ratio of Microcystis at both exponential and decline phases. RSM revealed that the order of influence factors on the removal of chlorophyll a was CPAM > PAC > pH for Microcystis at the exponential phase, and these orders of CPAM > PAC > pH (PAC coagulation) and CPAM > PAC > pH (CPAM coagulation) were for Microcystis at the decline phase. It suggested that the growth phase of cyanobacteria was also quite important to optimize the coagulation process. Besides, a fitted model was developed, and it could well predict the removal ratio of chlorophyll a by coagulation with various treatments. The model recommended dosages of CPAM (3.72 mg/L) and PAC (10.23 mg/L) for Microcystis at the exponential phase with a pH value of 8.25, and dosages of CPAM (5.98 mg/L) and PAC (17.81 mg/L) were for Microcystis at the decline phase with a pH value of 8.21. Overall, these results would provide a technical guideline of combining PAC and CPAM to treat cyanobacteria at exponential and decline phases.

Recovery of Zinc and Manganese from Spent Zn-Mn Batteries Using Solvent Extraction

2018 ◽  
Vol 775 ◽  
pp. 427-433
Author(s):  
Wei Sheng Chen ◽  
Chin Ting Liao ◽  
Chen Hsi Chang
Keyword(s):  
Solvent Extraction ◽  
Magnetic Separation ◽  
High Purity ◽  
Ph Value ◽  
Acid Leaching ◽  
Extractant Concentration ◽  
Environmental Technology ◽  
Electronic Products ◽  
Waste Plastic ◽  
Purity Level

For several decades, zinc-manganese batteries have been created to serve many forms of electronic products. However, every creative act has its destructive consequence. Plenty of waste element inside has caused the irreversible contamination to our environment.This study will focus on dealing with zinc-manganese batteries using environmental technology and hydrometallurgy methods, such as physical pretreatment, acid leaching and solvent extraction. The goal of this research will concentrate on the recovery of zinc and manganese from zinc-manganese batteries. The pretreatment processes include crushing, sieving and magnetic separation to separate the waste plastic, scraps of paper and impurity from waste zinc-manganese batteries. Before the process of the solvent extraction zinc-manganese batteries will be leached by specific acid first. In next step, the solvent extraction will be carried out and investigated. The parameters such as extractant concentration, extraction time, equilibrium pH value and organic-aqueous ratio (O/A) are analyzed in detail. Finally, the products of Zn and Mn are obtained in high-purity level and the recovery rates are about 92% for Zn and 95% for Mn.

Study on Extraction Technology and Stability of Melanin from Banana Peel

2013 ◽  
Vol 815 ◽  
pp. 287-292
Author(s):  
Li Jing Min ◽  
Jing Fen Li
Keyword(s):  
Metal Ions ◽  
Light Source ◽  
Room Temperature ◽  
Ph Value ◽  
Orthogonal Test ◽  
Raw Material ◽  
Banana Peel ◽  
Extraction Temperature ◽  
Solution Ph ◽  
Extraction Technology

[Objectiv The aim is to study the extraction technology of melanin from banana peel, and discuss its stability. [Metho We used banana peel as raw material, the absorbance at 410 nm as the index, extracted melanin by base-acid method, and optimized the extraction technology by the single factor and orthogonal test. Then we discussed the melanins stability at different temperature, light source, pH value, metal ions, antioxidant and reducing agents.[Result The best extraction conditions of melanin is that, hydrochloric acid soak time 5 h, alkaline solution pH value 14, extracting time 20 min, extraction temperature 70 °C, absorbance value about 0.309 A. Melanin from banana peel is stable at high temperature, different light source irradiation, reducing agent coexist; but at room temperature, metal ions and oxidizing agent coexist, it is unstable. [Conclusio This study provided experimental basis for the optimization and development of melanin from banana peel.

Experimental Study on Sulfuric Acid Leaching Behavior of Chromite with Different Temperature

2011 ◽  
Vol 361-363 ◽  
pp. 628-631 ◽  
Author(s):  
Cheng Jun Liu ◽  
Jie Qi ◽  
Mao Fa Jiang
Keyword(s):  
Sulfuric Acid ◽  
Acid Leaching ◽  
Raw Material ◽  
Leaching Rate ◽  
Sulfuric Acid Leaching ◽  
Leaching Process ◽  
Pollution Problem ◽  
Environmental Pollution Problem ◽  
Leaching Solution ◽  
Leaching Residue

Utilizing Pakistan chromite as raw material, the rapid leaching of chromium and iron could be realized by the sulfuric acid leaching process on the condition of atmospheric pressure and the addition of oxidant A. And the leaching rate of chromium and iron would be 98.5% and 71.9%, respectively. The sulfuric acid leaching processes with different temperature were systematically studied by chemical analysis and phase analysis. The results showed that, with the increase of reaction temperature, the leaching rate of chromium would increase gradually, but the leaching rate of iron increased at first and then decreases and reached its maximum at 140°C. When the temperature > 160°C, the phases of the leaching residue were magnesium iron silicate and a few of silica, no chromohercynite, chrompicotite and magnesioferrite existed in the chromite. The leaching solution of sulfuric acid leaching process could be used for preparing the basic chrome sulfate, and there is no Cr6+ in the leaching residue and solution. The results would provide theoretical guidance for solving environmental pollution problem of Cr6+ in traditional chromate production process.

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