Investigation of leaching kinetics of aluminum extraction from secondary aluminum dross with use of hydrochloric acid

2019 ◽  
Vol 187 ◽  
pp. 158-167 ◽  
Author(s):  
Qun Yang ◽  
Qi Li ◽  
Guofan Zhang ◽  
Qing Shi ◽  
Haigang Feng
Keyword(s):  
Hydrochloric Acid ◽  
Leaching Kinetics ◽  
Secondary Aluminum ◽  
Aluminum Dross ◽  
Kinetics Of

Leaching kinetics of scheelite in hydrochloric acid solution containing hydrogen peroxide as complexing agent

2014 ◽  
Vol 144-145 ◽  
pp. 140-147 ◽  
Author(s):  
Guixiang He ◽  
Zhongwei Zhao ◽  
Xiaobo Wang ◽  
Jiangtao Li ◽  
Xingyu Chen ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Hydrochloric Acid Solution ◽  
Complexing Agent ◽  
Leaching Kinetics ◽  
Kinetics Of

Leaching kinetics of Chevreul's salt in hydrochloric acid solutions

2014 ◽  
Vol 20 (4) ◽  
pp. 1141-1147 ◽  
Author(s):  
Turan Çalban ◽  
Burak Kaynarca ◽  
Soner Kuşlu ◽  
Sabri Çolak
Keyword(s):  
Hydrochloric Acid ◽  
Acid Solutions ◽  
Leaching Kinetics ◽  
Hydrochloric Acid Solutions ◽  
Kinetics Of

Kinetics of cyclization of S-ethoxycarbonylmethylisothiouronium chloride to 2-imino-4-thiazolidone

1979 ◽  
Vol 44 (3) ◽  
pp. 912-917 ◽  
Author(s):  
Vladimír Macháček ◽  
Said A. El-bahai ◽  
Vojeslav Štěrba
Keyword(s):  
Hydrochloric Acid ◽  
Dilute Hydrochloric Acid ◽  
Base Catalysis ◽  
General Base ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Kinetics Of Formation ◽  
Acid Catalyzed ◽  
Rate Limiting ◽  
Kinetics Of

Kinetics of formation of 2-imino-4-thiazolidone from S-ethoxycarbonylmethylisothiouronium chloride has been studied in aqueous buffers and dilute hydrochloric acid. The reaction is subject to general base catalysis, the β value being 0.65. Its rate limiting step consists in acid-catalyzed splitting off of ethoxide ion from dipolar tetrahedral intermediate. At pH < 2 formation of this intermediate becomes rate-limiting; rate constant of its formation is 2 . 104 s-1.

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).

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