Selective leaching kinetics of calcareous phosphate rock in lactic acid

2007 ◽  
Vol 131 (1-3) ◽  
pp. 41-48 ◽  
Author(s):  
Zafar Iqbal Zafar ◽  
Mohammad Ashraf
Keyword(s):  
Lactic Acid ◽  
Phosphate Rock ◽  
Leaching Kinetics ◽  
Selective Leaching ◽  
Kinetics Of

Selective Leaching Kinetics of Calcareous Phosphate Rock in Phosphoric Acid

2005 ◽  
Vol 5 (10) ◽  
pp. 1722-1727 ◽  
Author(s):  
M. Ashraf ◽  
Zafar Iqbal Zafar . ◽  
T.M. Ansari . ◽  
Fiaz Ahmad .
Keyword(s):  
Phosphoric Acid ◽  
Phosphate Rock ◽  
Leaching Kinetics ◽  
Selective Leaching ◽  
Kinetics Of

Selective leaching kinetics and upgrading of low-grade calcareous phosphate rock in succinic acid

2005 ◽  
Vol 80 (4) ◽  
pp. 286-292 ◽  
Author(s):  
Mohammad Ashraf ◽  
Zafar Iqbal Zafar ◽  
Tariq Mahmood Ansari
Keyword(s):  
Succinic Acid ◽  
Phosphate Rock ◽  
Low Grade ◽  
Leaching Kinetics ◽  
Selective Leaching

Selective leaching kinetics of low-grade calcareous phosphate ore in acetic acid

2009 ◽  
Vol 95 (3-4) ◽  
pp. 341-345 ◽  
Author(s):  
M. Gharabaghi ◽  
M. Noaparast ◽  
M. Irannajad
Keyword(s):  
Acetic Acid ◽  
Low Grade ◽  
Leaching Kinetics ◽  
Selective Leaching ◽  
Phosphate Ore ◽  
Kinetics Of

Kinetics of Phosphate Rock Dissolution in Acidic Soil Amended with Liming Materials and Cellulose

1996 ◽  
Vol 60 (6) ◽  
pp. 1589-1595 ◽  
Author(s):  
Z. L. He ◽  
V. C. Baligar ◽  
K. D. Ritchey ◽  
D. C. Martens ◽  
W. D. Kemper
Keyword(s):  
Phosphate Rock ◽  
Acidic Soil ◽  
Phosphate Rock Dissolution ◽  
Kinetics Of

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).

Crystallization kinetics of poly (L-lactic acid)/montmorillonite nanocomposites under isothermal crystallization condition

2011 ◽  
Vol 124 (3) ◽  
pp. 2216-2226 ◽  
Author(s):  
Jiunn-Jer Hwang ◽  
Su-Mei Huang ◽  
Hsin-Jiant Liu ◽  
Hawn-Chung Chu ◽  
Li-Huei Lin ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
Crystallization Condition ◽  
Kinetics Of ◽  
Montmorillonite Nanocomposites
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