Investigation of Molten Salt Phase Formation during Alkali Roasting of Titaniferous Minerals with Sodium and Potassium Hydroxide

2016 ◽  
pp. 1253-1260
Author(s):  
S. Parirenyatwa ◽  
L. Escudero-Castejon ◽  
S. Sanchez-Segado ◽  
Y. Hara ◽  
A. Jha
Keyword(s):  
Molten Salt ◽  
Phase Formation ◽  
Potassium Hydroxide ◽  
Salt Phase ◽  
Sodium And Potassium

scholarly journals Investigation of Molten Salt Phase Formation during Alkali Roasting of Titaniferous Minerals with Sodium and Potassium Hydroxide

2016 ◽  
Vol 16 (4) ◽  
Author(s):  
S. Parirenyatwa ◽  
L. Escudero-Castejon ◽  
S. Sanchez-Segado ◽  
Y. Hara ◽  
A. Jha
Keyword(s):  
Energy Consumption ◽  
Liquid Phase ◽  
Molten Salt ◽  
Phase Formation ◽  
Potassium Hydroxide ◽  
Salt Phase ◽  
Sodium And Potassium

Abstract The benefit of alkali roasting over existing processes is that it minimises waste and energy consumption compared with the current methods for the beneficiation of titaniferous minerals. Previous studies on the liquid phase formation during alkali roasting of titaniferous minerals were based on the use of Na

scholarly journals Formation of Chromium-Containing Molten Salt Phase during Roasting of Chromite Ore with Sodium and Potassium Hydroxides

2016 ◽  
Vol 16 (4) ◽  
pp. 215-225 ◽  
Author(s):  
Lidia Escudero-Castejon ◽  
Sergio Sanchez-Segado ◽  
Stephen Parirenyatwa ◽  
Animesh Jha
Keyword(s):  
Molten Salt ◽  
Extraction Yield ◽  
Water Soluble ◽  
Sodium Chromate ◽  
Water Leaching ◽  
Chromite Ore ◽  
Wide Range ◽  
Salt Phase ◽  
Sodium And Potassium ◽  
Equilibrium Calculations

AbstractChromium has a wide range of applications including metals and alloys manufacturing, pigments, corrosion resistance coatings and leather tanning. The production of chromium chemicals is based on the oxidative alkali roasting of chromite ores, which leads to the formation of water-soluble alkali chromates. Previous investigations reported that when chromite is roasted with soda-ash, a molten salt containing chromium, which is mainly composed of sodium carbonate and sodium chromate (Na2CO3-Na2CrO4 binary mixture), forms under typical roasting conditions. The physical properties of the liquid phase, which are dependent on the temperature, charge and gangue compositions, play an important role on the oxidation reaction and may limit the chromate recovery by hindering the oxygen transport to the reaction interface. This investigation focuses on the alkali roasting of chromite ore at 1,000 oC using NaOH and KOH, followed by water leaching. The influence of the alkali ratio on the chromium extraction yield is analysed, and the results obtained with both hydroxides are compared. Sample characterisation and thermodynamic analysis, including phase diagrams, equilibrium calculations and computation of liquidus curves, are combined with the purpose of studying the formation of the molten salt phase under different roasting conditions and its effect on the final chromium recovery.

Preparation of YBa2Cu3O7−x precursors from a fused eutectic of sodium and potassium hydroxides

1989 ◽  
Vol 4 (6) ◽  
pp. 1307-1311 ◽  
Author(s):  
Nicholas Coppa ◽  
Daniel H. Nichols ◽  
John W. Schwegler ◽  
J. E. Crow ◽  
G. H. Myer ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Potassium Hydroxide ◽  
Product Formation ◽  
Mechanical Grinding ◽  
Reaction Conditions ◽  
Fine Powders ◽  
Yttrium Barium ◽  
Sodium And Potassium

A method for preparing YBa2Cu3O7−x from the simultaneous thermal decomposition of the nitrates of yttrium, barium, and copper in an anhydrous fused eutectic of sodium and potassium hydroxide is described. This method eliminates the need for any mechanical grinding or the introduction of carbon containing anions. Products formed are fine powders (∼1 μm) having mole ratios 1.00Y:2.00Ba:3.06Cu.X-ray diffraction analyses reveal that the initial products are Y(OH)3, BaO2, and CuO, which when air calcinated/oxygen annealed at 900–950 °C form the superconducting YBa2Cu3O7−x A mechanism is postulated for product formation as a function of reaction conditions.

Modeling of binary molten-salt phase diagrams via neural networks

1995 ◽  
Vol 16 (6) ◽  
pp. 493-500 ◽  
Author(s):  
S. Dai ◽  
B. G. Sumpter ◽  
D. W. Noid
Keyword(s):  
Neural Networks ◽  
Molten Salt ◽  
Phase Diagrams ◽  
Salt Phase

Phase Formation, Dielectric and Ferroelectric Properties of Mn, Al Doped BCZT Ceramics by Molten Salt Method

2012 ◽  
Vol 139 (1) ◽  
pp. 83-91 ◽  
Author(s):  
Uraiwan Intatha ◽  
Piewpan Parjansri ◽  
Kamonpan Pengpat ◽  
Gobwute Rujijanagul ◽  
Tawee Tunkasiri ◽  
...  
Keyword(s):  
Molten Salt ◽  
Phase Formation ◽  
Ferroelectric Properties ◽  
Molten Salt Method

Computation of Ternary Molten Salt Phase Diagrams

1979 ◽  
Vol 62 (7-8) ◽  
pp. 414-422 ◽  
Author(s):  
P.-L. LIN ◽  
A. D. PELTON ◽  
C. W. BALE
Keyword(s):  
Molten Salt ◽  
Phase Diagrams ◽  
Salt Phase
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