In this paper we explore a variety of aqueous digestion techniques for the determination of gold in a wide variety of mineral matrices Acid digestion methods based upon modified aqua regia in which a larger proportion of nitric acid 5 1 HNO 3 HCl is involved competes effectively with fire assay to deliver accurate and precise values for gold in a fraction of the time
A new approach based on the use of inductively coupled plasma optical emission spectrometry ICP OES is presented for the quantitative determination of Fe Co Mn Cu Pb and Zn in ore samples
From the concentration of titanium in the acid leachates and the mass fraction of titanium in each roasted and washed ore sample obtained after total acid digestion the titanium leaching efficiency wt% in each experiment was calculated by Eq 3 The results obtained for titanium leaching efficiency were used to model the data by linear
The success of the sulfation roasting leaching process depends on iron behavior Due to its higher amount it is sulfated before nickel However the stability of iron sulfates is lower than the nickel sulfate and during the decomposition of iron sulfate the sulfur trioxide SO 3 is liberated and reacts with nickel to form nickel mechanism can
Towards a general acid based method for the determination of gold in ore samples by inductively coupled plasma mass spectrometry ICP MS together with an investigation of solvent extraction of
The same batch of nitric acid shall be used throughout the procedure Nitric acid diluted 1 3 V/V Add 250 ml of nitric acid to 500 ml of water in a 1000 ml volumetric flask and fill to the mark with water Aqua regia diluted 1 3 Dilute 210 ml of hydrochloric acid and 70 ml of nitric acid with about 500 ml of
Dissolution mechanisms and kinetics have a key role in better understanding of processes In this work magnetite and hematite powder were dissolved in oxalic and nitric acid mixtures at different temperatures Higher temperature and higher amounts of oxalic acid in the system accelerated the dissolution kinetics but did not result in higher solubility levels Oxalic
The optimization of anaerobic digestion process AD through the addition of trace elements TEs from active minerals has contributed to higher biogas volumes and CH 4 yields Wang et al 2017 According to Demirel and Scherer the addition of TEs such as iron Fe nickel Ni cobalt Co selenium Se zinc Zn copper Cu molybdenum Mo and tungsten
Abstract This paper investigates extraction of nickel and iron from a lateritic nickel ore from the Caldag region of Manisa in Turkey The ore sample contains % Ni % Fe and % Co The process applied includes digestion with 40 wt % sulfuric acid at 200 C for 60 min roasting at 700 C for 15 min
A four acid digestion is considered a near total method in that most mineral phases will be digested A few volatile elements such as Hg are not available from this stronger leach they are lost during sample dissolution and precision is generally slightly higher due to the more complex solution matrix caused by dissolution of silicate
DOI /IE00072A020 Corpus ID 97313221; The digestion of phosphate ore in phosphoric acid article{Sluis1987TheDO title={The digestion of phosphate ore in phosphoric acid} author={Sietse Van der Sluis and Yulia Meszaros and March{ e}e and Hans A Wesselingh and Gerda M van Rosmalen} journal={Industrial & Engineering Chemistry
We employed anti corrosion acid digestion bombs an aqua regia hydrofluoric acid system and a digestion temperature of 180 °C achieving exceptional results Wen H Ma S Ma X et al Wang inductively coupled plasma emission spectrometry simultaneously determined 8 elements in iron copper lead zinc sulfide ore Rock Ore Test 2011;30 05
Various acid digestion methods were developed for the selected ore samples under high intensity infrared radiation and delivered virtually complete recoveries of all of the elements of interest
Abstract In this article the recovery of the Y La Nd and Ce rare earth elements REE from apatite concentrate by acid leaching and digestion water leaching processes were studied The maximum REE recovery of 62% in the acid leaching process with sulfuric acid was obtained for La in the condition of 12 M acid concentration leaching time of 4 h process temperature of 25°C
To improve the recovery of rare earth elements REEs from a refractory ore this study investigated two different chemical decomposition methods namely sulfuric acid baking and caustic digestion with their respective leaching processes The studied lateritic ore contained goethite FeOOH as a major constituent with REEs scattered around and forming submicron
The initial step of pyrite oxidation in the presence of atmospheric oxygen is described in Eq is a pH controlled reaction with oxidation initiated around pH 6 Evangelou and Zhang 1995 Oxygen directly reacts with pyrite and forms Fe 2 This is subsequently oxidised to Fe 3 Eq 2 Ferric iron has a low solubility around neutral pH but as oxidation proceeds
partially attacked by the digestion but most remain undissolved so do not form part of the reported results Why Four Acid Digestion A four acid digestion utilises a combination of nitric perchloric and hydrofluoric acids with a final dissolution stage using hydrochloric acid This digestion breaks down most silicate and oxide minerals
We developed a rapid acid digestion method for preparing tissue samples for iron determination Specimens were digested in nitric acid and hydrogen peroxide under high temperature and pressure in closed Teflon vessels with microwave energy Analysis for iron in 25 to 250 mg portions of digested bo
CHROMIUM IRON NICKLE & COBALT 168 DETERMINATION OF SILVER BY ATOMIC Wet method constitutes the digestion of an ore sample with an acid or a mixture of acids to convert the complex ore mineral into simple chemical compounds The action of an acid or a mixture of acids is supplemented by heat and pressure
Thus hydrofluoric acid free SiO2 NP digestion protocols based on KOH present an effective recoveries of >84% less hazardous and easy to implement alternative to current methods
Calcium Silver Iron Chromium Sodium Lead Cobalt Thallium Molybdenum Copper Vanadium Selenium Iron Zinc Thallium Lead Vanadium This method is not a total digestion technique for most samples It is a very strong acid digestion that will dissolve almost all elements that could become environmentally available By design elements
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