3 edition of Methods For Analyzing Tungsten Ores and Concentrates. found in the catalog.
Methods For Analyzing Tungsten Ores and Concentrates.
United States. Bureau of Mines.
|Series||Report of investigations (United States. Bureau of Mines) -- 6148|
|Contributions||Peterson, H., Anderson, W., Howcroft, M.|
Table 1 is the particle analysis of the raw ore, showing that most of the tungsten and cassiterite mineral particles fell into the fine particle size range. Specially, most of the valuable minerals distribute in − mm fraction, and super fine particles (− mm) account for more than 30%.Cited by: 3. ISO , Chromium ores and concentrates -- Methods of chemical analysis -- General instructions [ISO TC 65] on *FREE* shipping on qualifying offers. ISO , Chromium ores and concentrates -- Methods of chemical analysis -- General instructionsAuthor: ISO TC
Tungsten Assaying Method 1 The routine procedure for the assay of rich wolfram ores or concentrates was as follows:—Take 1 gram of finely-ground sample; digest with HCl and HNO3 for about 2 hours, evaporating down to near dryness. ASTM's analytical chemistry standards are instrumental primarily in chemical analysis of various metals, alloys, and ores. These analytical chemistry standards present various test methods and techniques in determining the chemical composition of alloys and ores which include molecular absorption spectrometry, X-ray emission spectrometry, optical emission vacuum spectrometry, .
Scheelite (CaWO4) and Wolframite ((Fe,Mn)WO4) are the principal minerals of tungsten, but other important minerals include ferberite (FeWO4) and huebnerite (MnWO4) will also respond to froth high specific gravity of these minerals makes many of these ores amenable to gravity concentration methods, however, the fine dissemination of mineral in gangue for some ores . Mineral processing - Mineral processing - Concentration: Concentration involves the separation of valuable minerals from the other raw materials received from the grinding mill. In large-scale operations this is accomplished by taking advantage of the different properties of the minerals to be separated. These properties can be colour (optical sorting), density (gravity separation), .
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Methods for analyzing tungsten ores and concentrates (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: Heber E Peterson; W L Anderson; M R Howcroft; United States.
Bureau of Mines. A simple and rapid method for the determination of tungsten in ores and concentrates by atomic absorption spectrometry is described. A dinitrogen oxide-acetylene flame was used and the absorbance was measured at nm.
The samples were decomposed using fused potassium hydrogen sulphate, which was found to be a s. Abstract. Analyzing the state of the raw staff market of tungsten shows that, despite the presence of a large raw materials base in Russia, the average content of tungsten in ores is low, which determines not only the quality of concentrates but also the economic indices directly connected with choosing the methods for opening and hydro-metallurgical by: 4.
Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link) http. Analyzing the state of the raw staff market of tungsten shows that, despite the presence of a large raw materials base in Russia, the average content of tungsten in ores.
A comparison is made of the precision and accuracy of the conventional WO 3-gravimetric inductively coupled plasma atomic emission (ICP-AES) determination of macro amounts of tungsten in tungsten ores, concentrates, and tungsten powders are readily dissolved in hydrogen peroxide.
Samples having a complex mineralogical and Cited by: 5. A process for recovering tungsten from tungsten bearing ores comprises producing a concentrate from the ore and leaching the concentrate at atmospheric pressure in a strong mineral acid solution, Cited by: The rapid determination of tungsten in ores and concentrates by atomic absorption spectrometry.
and there is an increasing need for rapid methods for analysing ores and concentrates. The colorimetric method of Quin and Brooks1 has a high productivity for the analysis of soils, stream sediments, low-grade ores and vegetation, and in the past Cited by: 9.
Much of the tungsten production results from the high-grade tungsten ore concentrates (such as wolframite and scheelite) and synthetic concentrates obtained from tungsten scraps (Lassner.
The Beneficiation flowsheet shown with this study is particularly adapted to the concentration of tungsten ore in small tonnages.
Tungsten minerals are generally in the friable class and therefore concentrating processes are hindered by the excess amount of fines produced in the crushing and grinding steps.
Special consideration must be given to the stage reduction and. In this study the segmentation method described above was applied to four tungsten-bearing samples from the Riviera deposit (Rozendaal and Scheepers, ).In order to perform the analysis it is assumed that the tungsten minerals are the densest particles in the sample and have a substantial enough histogram peak which can be used for a reasonable initial threshold choice in the analysis Cited by: 6.
To obtain concentrates containing percent WO3, the ores are enriched using gravitational, flotation, and other methods of concentration. Endogenic deposits of tungsten are postmagmatic, pneumatolytic, or hydrothermal and are. A rapid method for the determination of tungsten in soils, stream sediments, rocks and vegetation with dithiol, is described.
Samples are fused with. A fairly simple chemical test for any tungsten ore is to grind to a fine powder and boil with concentrated hydrochloric acid for 15 minutes. If tungsten is present, the solution turns cloudy yellow and will turn blue if a piece of aluminum, zinc, solder, or tin is added.
The yellow residue is soluble in ammonia. 9/10/96 PM Safety Information The Analytical Methods section describes methodologies using a wide variety of potentially File Size: 1MB. Abstract An X-ray fluorescence method for the analysis of ores and concentrates for one or more metals or other heavy elements is described.
A tungsten-target tube is used and the spectral interference of Rayleigh and Compton scattered peaks reduced by a nickel by: 3. Tungsten ores are generally subjected to physical beneficiation techniques such as gravity, flotation, magnetic and electrostatic separation to obtain marketable grade mineral concentrates (60–70% WO 3).
However, physical beneficiation of low-grade tungsten ores having the mineralisation in finely disseminated form, invariably yields marketable grade concentrates Cited by: Tungsten has been determined by atomic absorption spectrometry at nm using a dinitrogen oxide-acetylene flame in an alkaline medium with potassium persulphate as releasing agent, which causes an enhancement of around 75% in the tungsten signals.
The medium being alkaline, the cations generally associated with. High price and ready market for acceptable tungsten concentrates present a very attractive incentive for the mining and processing of tungsten ores. Since all tungsten ores are very friable and slime easily, concentration must take place as soon as the mineral has been liberated by either crushing or grinding methods.
Concentrates. Marketable ore concentrates of scheelite and wolframite (hübnerite, ferberite) contain typically 65 – 70 % WO -grade concentrates having lower WO 3 concentrations are seldom on the market and if so, only for a lower price.
In fully integrated companies lower grades (% WO 3) are often preferred, because upgrading to high concentrations is mostly.
The consensus values are given in Table 3, together with the overall means obtained by wet chemical and fire-assay methods. It is apparent that a wet-chemical (acid) decomposition with atomic-absorption finish is a popular method for the analysis of base-metal ores and concentrates containing >50 jug/g of by: 4.A number of analytical methods are available for the analysis of tungsten concentrates: spectrophotometry, titrimetry, the weighting method (2).
Most of them are the labor-intensive and time-consuming. The XRF is the most popular technique especially when a large number of samples of similar type are to be analyzed. Tungsten is one of the most important refractory metals. It is used in the production of numerous end-use items such as incandescent lamps and hard materials.
From its ore concentrates and oxidized scrap, tungsten is processed via a hydrometallurgical route. In the last years there has been a significant change in its processing. This paper reviews the methods Cited by: