Isothermal Growth of Spinel Crystals in Vanadium-Chromium Slag

2018 ◽  
Vol 53 (3) ◽  
pp. 1700276
Author(s):  
Jiang Diao ◽  
Lixiong Shao ◽  
Wang Zhou ◽  
Tao Zhang ◽  
Bing Xie
Keyword(s):  
Chromium Slag ◽  
Isothermal Growth

Study on leaching kinetics of hexavalent chromium from aged calcium-free chromium slag

2021 ◽  
pp. 1-13
Author(s):  
Quan Qi ◽  
Liang Li ◽  
Liangyu Wei ◽  
Baoming Hu ◽  
Zheng Liu ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Resource Utilization ◽  
Scientific Basis ◽  
Diffusion Reaction ◽  
Leaching Kinetics ◽  
Leaching Rate ◽  
Chromium Slag ◽  
Leaching Solution ◽  
Main Components ◽  
Kinetics Of

To provide a scientific basis for the resource utilization of chromium slag, this article studies the release law of hexavalent chromium in the aged calcium-free chromium slag. XRD (X-ray diffractometer) and MLA (Mineral Liberation Analyzer) were used to analyze the composition of the chromium slag; using sulfuric acid-nitric acid as the leaching solution, the release law of hexavalent chromium in chromium slag and the leaching kinetics were studied. The results show that main components of the chromium slag are magnesioferrite, chromite, hematite, hydrargillite, and spinel; chromium is mainly present in chromite and magnesioferrite; the leaching rate of hexavalent chromium increases with the increase of temperature or the decrease of pH. The analysis of leaching kinetics shows the leaching rate is controlled by the internal diffusion reaction, and the apparent activation energy is 11.93 kJ·mol–1. The chromium slag is aged in high temperature seasons, which is conducive to the precipitation of hexavalent chromium in the chromium slag, can increase the yield of chromate in the roasting kiln, and is conducive to resource utilization; chromium slag should be stored in order to prevent acid rain erosion which leads to environmental pollution risk (e.g. drinking water).

Isothermal growth of epitaxial layers of gallium arsenide from stirred gallium solutions

1976 ◽  
Vol 32 (1) ◽  
pp. 93-99
Author(s):  
F.A. Kuznetsov ◽  
S.T. Tchistanova ◽  
L.A. Borisova ◽  
V.I. Kosyakov ◽  
A.N. Dorohov
Keyword(s):  
Gallium Arsenide ◽  
Epitaxial Layers ◽  
Isothermal Growth

Reaction Process of Chromium Slag Reduced by Industrial Waste in Solid Phase

2007 ◽  
Vol 14 (1) ◽  
pp. 12-15 ◽  
Author(s):  
Yu-min Shi ◽  
Xing-hong Du ◽  
Qing-jia Meng ◽  
Shi-wei Song ◽  
Zhi-tong Sui
Keyword(s):  
Industrial Waste ◽  
Solid Phase ◽  
Reaction Process ◽  
Chromium Slag

Isothermal growth of hydrogen bubbles during electrolysis

AIChE Journal ◽  
1961 ◽  
Vol 7 (3) ◽  
pp. 357-362 ◽  
Author(s):  
D. E. Westerheide ◽  
J. W. Westwater
Keyword(s):  
Hydrogen Bubbles ◽  
Isothermal Growth

Hexavalent chromium pollution caused by dumped chromium slag at the urban park in Tokyo

2014 ◽  
Vol 17 (1) ◽  
pp. 201-205 ◽  
Author(s):  
Mayumi Hori ◽  
Katsumi Shozugawa ◽  
Motoyuki Matsuo
Keyword(s):  
Hexavalent Chromium ◽  
Urban Park ◽  
Chromium Slag
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