RESEARCH OF TECHNOLOGY FOR EXTRACTION OF RARE AND NOBLE METALS FROM RESET CUES AND SLUDGE FIELD SOLUTIONS

2020 ◽  
Vol 1 (6(75)) ◽  
pp. 13-17
Author(s):  
A.N. Shodiyev ◽  
Abdurashid Saliyevich Hasanov ◽  
Oybek Ahmadovich Azimov
Keyword(s):  
Molybdenum Oxide ◽  
High Purity ◽  
Noble Metals ◽  
Starting Material ◽  
Chemical Purification ◽  
Ammonia Water ◽  
Technological Cycle ◽  
Practice Standard

Currently, in world practice, standard molybdenum concentrates undergo oxidative firing to obtain technical molybdenum oxide, which is the starting material for the production of ferromolybdenum. For the production of high-purity products, technical oxide is subjected to chemical purification by dissolving it in a solution of ammonia water. Molybdenum salts are precipitated from ammonia solutions, and Fe, Si, Cu, Al impurities are introduced with waste solutions from the technological cycle.

DISLOCATION STRUCTURE IN "AS-GROWN" HIGH-PURITY IRON SINGLE CRYSTALS

1967 ◽  
Vol 45 (2) ◽  
pp. 1041-1045 ◽  
Author(s):  
S. Kadečková ◽  
B. Šesták
Keyword(s):  
Single Crystals ◽  
Dislocation Structure ◽  
High Purity ◽  
Starting Material ◽  
Etch Pits ◽  
Dislocation Densities ◽  
Purity Iron ◽  
High Purity Iron

The dislocation structure in iron single crystals prepared by two different strain–anneal techniques from the starting material of two different purities is studied by the method of etch pits. Average dislocation densities of 2.6 × 105 to 7 × 105 cm−2 and the absence of subboundaries are observed in single crystals grown statically or dynamically from zone-refined Johnson and Matthey spectrographic iron. The presence of broad subboundaries and average dislocation densities of 8.6 × 105 to 3.3 × 106 cm−2 is characteristic for single crystals grown from the non–zone-refined J. and M. iron. Annealing of "as-grown" crystals does not greatly influence the dislocation structure. It is assumed that the impurities are mainly responsible for the observed dislocation densities.

Search and Synthesis of New Family of Quasicrystals

2003 ◽  
Vol 805 ◽  
Author(s):  
Tsutomu Ishimasa ◽  
Shiro Kashimoto ◽  
Ryo Maezawa
Keyword(s):  
Electron Concentration ◽  
Noble Metals ◽  
Alloy Composition ◽  
Starting Material ◽  
Icosahedral Quasicrystal ◽  
Base Metals ◽  
Transition Elements ◽  
New Family ◽  
Cast Alloys ◽  
P Type

ABSTRACTStarting from the Zn17Sc3 cubic approximant, new icosahedral quasicrystal was searched by substituting Zn by other metals, M, at the alloy composition of Zn75M10Sc15. In the cases of M = Mn, Fe, Co, Ni, Pd, Pt, Ag and Au, new P-type quasicrystals were discovered in as-cast alloys. In the cases of M = Fe, Co, Ni, Pd and Ag, the quasicrystals are thermodynamically stable at approximately 700 °C. This result indicates that use of an approximant crystal as a starting material is very efficient way to search new quasicrystal alloy, and many kinds of metals stabilize the quasicrystal structures; i.e. noble metals and transition elements including Mn, Fe, Co and Ni in addition to Mg. Taking the variety in base metals of Tsai-type approximants into account, this variety in additional components suggests many possibilities of undiscovered quasicrystals. The equality ofthe electron concentration, ela ≈ 2.1, in Hume-Rothery rule may be a guide to these quasicrystals.

Production of Single-Phase Hydroxyapatite Porous Bodies from Gypsum/Polystyrene

2016 ◽  
Vol 881 ◽  
pp. 187-192
Author(s):  
Amanda A. Barbosa ◽  
Andrea V. Ferraz ◽  
Geciane A. Santos ◽  
Nelson C. Olivier ◽  
Alan Christie Silva Dantas
Keyword(s):  
Compressive Strength ◽  
High Purity ◽  
Pore Formation ◽  
Single Phase ◽  
Low Cost ◽  
Starting Material ◽  
Porous Hydroxyapatite ◽  
Second Stage ◽  
Porous Bodies ◽  
Purity Material

Porous bodies were produced using hydroxyapatite as a starting material, gypsum, high purity material, low cost and that can be molded into the desired shape. Also, beads of polystyrene polymer. The first step of this work was to produce porous gypsum blocks obtained by mixing gypsum, water and polystyrene. After drying, they were submerged in acetone solvent for solubilizing the polymer and pore formation. The porous hydroxyapatite was synthesized in a second stage, where the porous gypsum blocks were immersed in a solution of (NH4)2HPO4 0.5 mol L-1 to 100 ° C and pH 7.0-9.0 for 24 hours. From this method, it was possible to produce bodies single phase hydroxyapatite with a maximum porosity of 70 ± 3% and a compressive strength of 1.48 ± 0.17 MPa.

Preparation of high purity indium by chemical purification: Focus on removal of Cd, Pb, Sn and removal mechanism

2021 ◽  
Vol 200 ◽  
pp. 105551
Author(s):  
Shuo Xu ◽  
Gang Wang ◽  
Jinlong Fan ◽  
Ziming Wang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
High Purity ◽  
Removal Mechanism ◽  
Chemical Purification

Characterization of Silicon Kerf and the Effect of Grinding on the Synthesis of SiC Powder

2013 ◽  
Vol 761 ◽  
pp. 69-72 ◽  
Author(s):  
Woo Teck Kwon ◽  
Soo Ryong Kim ◽  
Y. Kim ◽  
Yoon Joo Lee ◽  
Ji Yeon Won ◽  
...  
Keyword(s):  
Particle Size ◽  
Silicon Wafer ◽  
High Purity ◽  
Silicon Oxide ◽  
Silicon Particle ◽  
Starting Material ◽  
High Purity Silicon ◽  
Grinding Conditions ◽  
Grinding Time

Characterization of silicon kerf from photovoltaic silicon-wafer production was carried out. Also, SiC powder was synthesized using high purity silicon kerf by varying grinding conditions. With increase of grinding time, surface of the silicon was oxidized to form silicon oxide. Also, it was observed that the unreacted silicon oxide and free silicon amount in the SiC powder increases with an increasing grinding times, even though silicon particle size of the starting material is decreased.

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