The following components were present in stibnite: Sb2S3, SiO2, ZnS, FeS2. The aim of this study was to establish the effect of composition of the aqueous alkaline leaching medium (1 % NaOH, 1 % NaOH + 1 % Na2S2O3, 1 % NaOH + 1 % Na2S) on the recoveries of Sb, Fe, Pb, Zn, Cu, Ni and Hg.
The following components were present in stibnite: Sb2S3, SiO2, ZnS, FeS2. The aim of this study was to establish the effect of composition of the aqueous alkaline leaching medium (1 % NaOH, 1 % NaOH + 1 % Na2S2O3, 1 % NaOH + 1 % Na2S) on the recoveries of Sb, Fe, Pb, Zn, Cu, Ni and Hg.
Dr. Corby G. Anderson Harrison Western Professor The Kroll Institute for Extractive Metallurgy Colorado School of Mines Stibnite Alkaline Sulfide Leaching Technology;
This article covers acid nitric leaching of Olympiada deposit refractory gold-bearing concentrate after alkaline leaching of stibnite. Thermodynamic analysis of the reaction pyrite and ...
Temperature: 293-345 K. S E M study of the residues after stibnite leaching The samples of stibnite leached for 5 and 20 min with alkaline solution of sodium hydrogen sulphide at 293 and 333 K were subjected to morphological investigation by scanning electron microscopy ( SEM ).
Oct 15, 2009· This paper presents the results of a laboratory investigation of alkaline leaching of stibnite sample, which originated from Pezinok (Slovakia) mine. The leaching media used was aqueous solution containing sodium hydroxide. This research focused on establishing the effect of the following parameters on alkaline leaching: NaOH concentration, temperature of leaching, and grain size of …
leaching followed by electrodeposition. The alkaline sulfide system is employed industrially in the CIS, China and the United States (Anderson, 2000). Essentially, the lixiviant is a mixture of sodium sulfide and sodium hydroxide and when it is applied to stibnite, a solution of thioantimonite is formed. This can be illustrated as: + − ...
Jul 14, 2016· Leaching and Recovering Gold from Antimony Minerals Stibnite (Antimony Sulphide, Sb2S2) This mineral in an ore acts as a weak acid, combining with alkalis to form salts, of the order of M1/3SbS2 and M1/3SbS4 alkaline sulphantimonite and sulphantimonate, especially in the presence of iron sulphides, using high concentrations of lime or alkalis.
Feb 08, 2016· Alkaline leaching was used to extract the antimony, followed by the oxidation of Sb(III) in a hydroquinone-catalyzed alkaline electrolyte, which precipitates antimony as sodium hydroxyantimonate NaSb(OH) 6 (with 90 % recovery). Besides stibnite, researchers are also investigating other, complex antimony minerals.
Abstract A circulatory hydrometallurgical process: ferric trichloride (FeCl3) leaching of antimony sulfide (Sb2S3) (production of Sb by replacing it with iron) followed by membrane electrowinning of ferrous chloride (FeCl2), was developed to cleanly extract Sb from stibnite. First, Sb was leached (leaching efficiency >98%), using FeCl3 as leaching reagent, under the following optimum ...
Feb 09, 2017· The cyanide leaching rate of gold from a multi-refractory gold concentrate (18.05 g/t Au) containing 1.62% As, 20.76% S, 6.95% C and 1.31% Sb was only 1.33%. The enhancement of gold leaching was studied mainly by the pretreatment of oxidative roasting and alkaline sulfide washing.
Mar 13, 2015· Electrowinning of antimony from model sulphide alkaline solutions [J]. Hydrometallurgy, 2013, 137(5): 60–67. Article Google Scholar [2] MAHLANGU T, GUDYANGA F P, SIMBI D J. Reductive leaching of stibnite (Sb 2 S 3) flotation concentrate using metallic iron in a hydrochloric acid medium I: Thermodynamics [J]. Hydrometallurgy, 2006, 84(2): 192 ...
Jun 09, 2021· The purpose of this study is to develop the kinetic model and to find the optimum leaching conditions for maximum alumina dissolution from sintered nepheline syenite resource in the alkaline solution. About 80% of alumina (smaller than 5% of silica) was effectively recovered at 80 °C, 3 M NaOH, particle size less than 88 μm, agitation speed of 800 rpm, and leaching time of 60 min with a ...
arsenopyrite, stibnite, and thegangue minerals were mainly quartz. Anodic polarization curve shows ... during alkaline leaching, steady-state polarization curves in reaction medium were measured. The scanning speed of the steady -state polarization curve was determined to be 1 mV·s-1 of the experiment.
US2813003A US325045A US32504552A US2813003A US 2813003 A US2813003 A US 2813003A US 325045 A US325045 A US 325045A US 32504552 A US32504552 A US 32504552A US 2813003 A US2813003 A US 2813003A Authority US United States Prior art keywords uranium sodium leaching carbonate potassium Prior art date Legal status (The legal status is an assumption and is …
The reductive leaching using iron powder in mineral acid has also been reported for the efficient recovery of antimony from stibnite [7] . The other hydrometallurgical method commonly investigated by the researchers i.e. alkaline leaching, has been performed using solutions of either sodium hydroxide or sodium hydroxide along with sodium ...
Investigation of Alkaline Leaching Parameters on Stibnite Concentrate Mining, Metallurgy & Exploration Pub Date :, DOI: 10.1007/s42461-020-00266-x Serdar Aktaş, Burcu Nilgün Çetiner According to critical statistical studies, antimony is one of the rarest elements in the world, and global resources could be exhausted by 2050.
The paper is an overview of alkaline leaching of stibnite by mixed Na2S + NaOH or by NaOH leaching solutions. The behaviour of minor constituents, such as mercury, copper, nickel, iron, lead and zinc in alkaline leaching is also discussed in detail.
the previous alkaline reactivity testing (Gow et al., 201). Leaching must therefore be done at 4a lower potentials. The region of thioarsenate, AsS 4 3-, stability is seemingly unchanged across the stability diagrams, suggesting that the Cu/S ratio is important to selectively leaching arsenic.
Front Cover: In article number 2100238 by Dario R. Dekel, Charles E. Diesendruck and co-workers look at the ligand valency effect on the alkaline stability of metallopolymer anion-exchange membranes. In alkaline fuel cells and electrolyzers, the aggressive alkaline environment decomposes organic cations and metallopolymers present a promising alternative.
Muhammad Arif Bhatti et al., J.Chem.Soc.Pak., Vol. 40, No. 06, 2018 1035 Oxidative Chlorination Leaching of Stibnite Using Acidic Ferric Chloride Lixiviant 1Muhammad Arif Bhatti*, 2Ahmad Adnan, 3Abdul Ahad, 1Kamran Raza Kazmi and 1Adnan Akram 1Mineral Processing Research Centre, PCSIR Laboratories Complex, Lahore-54600, Pakistan. 2Department of Chemistry, GC University, Lahore …
The rate of leaching antimony, which is present in the form of stibnite mineral (Sb2S3), may be affected by selecting the appropriate leaching solution or by pre-treating the ore. From thermodynamic aspect for conversion of compounds to solution according to literature [1, 2] it is possible to use acid and also alkaline solutions. The most
KEYWORDS: stibnite, alkaline leaching, kinetics, apparent activation energy, apparent order of reaction INTRODUCTION From the thermodynamic point of view dissolution of antimony compounds (oxides, sulphides) can take place both in acidic and alkaline solutions, which
The leaching media used in this study were aqueous solutions containing sodium hydroxide. Establishing the effect of the following parameters on alkaline leaching: NaOH concentration, temperature of leaching and grain size of solid phase was the focus of this research. The apparent activation energy and apparent order of stibnite reaction with the
This article covers acid nitric leaching of Olympiada deposit refractory gold-bearing concentrate after alkaline leaching of stibnite. Thermodynamic analysis of the reaction pyrite and arsenopyrite with nitric acid chemical equations was performed. Equilibrium Eh-pH Pourbaix diagrams of heterogeneous systems studied, containing iron and arsenic were charted.
Leaching and recovery of gold from ore in cyanidefree ... The novel method demonstrates that the oxidation and dissolution of gold and silver in alkaline cyanide solution can be conducted simultaneously in the same reactor in less . ... in the case of stibnite (Sb2S3), the antimony (Sb) forms stable ...
Abstract: This article covers acid nitric leaching of Olympiada deposit refractory gold-bearing concentrate after alkaline leaching of stibnite. Thermodynamic analysis of the reaction pyrite and arsenopyrite with nitric acid chemical equations was performed. Equilibrium Eh-pH Pourbaix diagrams of heterogeneous systems studied, containing iron ...
Time of leaching 1 hour Temperature 200 C. Quantity of solution 250 0 0 Variable amount of Stibnite used Amount of'Stibnite Percentage Grams of Sb per used Extracted Liter of Solution 1 75~ 2.10 2 73% 4.10 3 70% 5.95 4 71% 8.35 8 37% 8.60 From the results obtained it is apparent that the more Stibnite there is introduced into the solution
Dec 01, 2020· The leaching kinetics of antimony from refractory gold ore in alkaline sodium sulfide was investigated under ultrasound. The influence of factors such as stirring speed, temperature, the concentration of sodium hydroxide and sodium sulfide and particle size, was studied. The leaching kinetics has also been studied under convention and ultrasound.
Jan 01, 2011 The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 gt Au and 220 gt Ag and contained predominantly quartzclay and barite, and to a lesser extent, sulphides such as pyrite, stibnite, sphalerite, zinkenite Pb 9 Sb 22 S 42 and andorite Sb 3 PbAgS 6.The ...
Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science. Defect and Diffusion Forum
preheat tank of the leaching circuit. B. Extraction 1. Theory The chemistry of the alkaline leaching system requires the oxidation of tetravalent uranium to the hexavalent state, Oxygen available in the air is the most common oxidant used. The hexavalent uranium dissolves in …
CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING . Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig. 1. The Pourbaix diagram of Fe–S at [Fe] –= 10 4 M, [S] = 10– M and 25 C (the chlorine species regions are …
Its extraction cost is increasing due to poor-quality ore, deep mining, remote locations and high energy consumption. In the present study, an alkaline leaching process was carried out on stibnite concentrate to evaluate the effect of reaction parameters on the antimony extraction rate. Full-text paper:
Sep 17, 2014· Leaching of Arsenic And Antimony Sulphide Minerals with Cyanide. A series of tests were run to investigate the effects of strongly alkaline and weakly alkaline cyanide solutions on the decomposition of arsenopyrite, realgar, orpiment, and stibnite.
Dec 31, 2018· The alkaline sulfide system dominates the acidic chloride system and many industrial plants have employed it. It consists of two steps i.e. leaching and electrowinning. The leaching operation uses a mixture of sodium hydroxide and sodium sulphide and the reactions involved in the leaching operation are quite complicated.