Effect of elevated temperature and pressure on the leaching characteristics of Indian coals

Dash, Pratik Swarup; Lingam, Ravi Kumar; Kumar, Satish; Suresh, A.; Banerjee, P. K.; Ganguly, Sayan

doi:10.1016/j.fuel.2014.09.110

Cited by 31 publications

(14 citation statements)

References 24 publications

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“…4, where it can be seen that the higher the temperature, the easier the precipitation of heavy metal from antimony waste rocks. Because the dissolving process of antimony waste rocks in soaking solution was an endothermic process, according to the principle of chemical balance, when temperature rose, the balance would be conducive to heat absorption, especially the precipitation of heavy metal-Sb from antimony waste rock; the change of Sb precipitation with time was small at low temperature (15ºC), and the effect of temperature on As precipitation in antimony waste rock was smaller than that on the precipitation of Sb [18][19][20].…”

Section: Effect Of Temperature On Sb and As Releasementioning

confidence: 99%

Leaching and Releasing Characteristics and Regularities of Sb and As from Antimony Mining Waste Rocks

Zhang

Ren

Hursthouse³

et al. 2019

Pol. J. Environ. Stud.

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The antimony mining waste rocks refer to the waste antimony ores generated in mining, crushing-manual picking or dense medium separation [1]. The waste rocks are large in size, and gray-black, mainly composed of stibnite, pyrite, quartz, fluorite, lignite, calcite and other minerals [2, 3]. A large number of untreated waste rocks are usually transported directly to the stacking area and exposed to the surface for a long time. Under the action of rain, the precipitation of heavy metals from waste rocks will threaten the mining area environment health and surrounding residents [4, 5], especially that the leaching of Sb and As will cause extreme damage to the surrounding environment [6-8]. At present, there is less literature on the dissolution and release characteristics of heavy metals in solid

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Section: Effect Of Temperature On Sb and As Releasementioning

confidence: 99%

Leaching and Releasing Characteristics and Regularities of Sb and As from Antimony Mining Waste Rocks

Zhang

Ren

Hursthouse³

et al. 2019

Pol. J. Environ. Stud.

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“…Eh impact the leaching behavior in two aspects, higher kinetical ratio in one hand, and oxidation of some minerals that stable in an anaerobic environment in the other hand [5] . Temperature may promote the water-rock interaction according to the thermodynamics laws [10] . Some researchers have also discussed the impact of liquid/solid ratio [7] , types of leaching water [5] on the trace elements’ migration, as some major components, such as sulfate, may hider release of trace elements [5] .…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

“…The leaching experiments were designed in batch mode to simulate water-rock interaction in a coal seam where the water moves slow and reaction tends to achieve equilibrium [7] , [11] , [12] , [13] . To avoid effect of content of solid samples on leaching behavior, most of the leaching experiments used the same coal/rock samples.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Data on trace element concentrations in coal and host rock and leaching product in different pH values and open/closed environments

2019

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The data presented in this article are related to the research article entitled “Multivariate analysis of trace elements leaching from coal and host rock” [1]. During coal mining, coal and host rock undergo water-rock interaction, leading to release of trace elements to surface and ground water. The batch experiments were designed and implemented to investigate the leaching behavior and mechanisms during the process of water-rock interaction. In different experimental sets, various types of leaching water, open/closed environments, temperature, and initial pH values were used to evaluate their impact on leaching of trace elements. These data could be used to analyze leaching mechanisms of trace elements from coal and host rock, and understand, predict, control trace elements’ contamination to surrounding waters.

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“…Moreover, the ash and sulphur-free coal can efficiently be used in iron-making process in the form of coke. 15…”

Section: Pre-treatment Analysesmentioning

confidence: 99%

Effect of complexing agents on desulphurization and deashing of coal by H₂O₂/H₂SO₄ leaching

Sana

Haider

Rahim

et al. 2018

Energy & Environment

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The present study was aimed at investigating the effect of the addition of complexing agents on the removal efficiency of sulphur and ash contents during chemical leaching by acidified hydrogen peroxide. Representative coal sample from Lakhra was subjected to chemical leaching under various conditions of the parameters including time (60 and 120 min), temperature (25 and 50°C), complexing agents (citric acid and phosphoric acid) and the concentration of complexing agents (100 and 1000 ppm). The addition of complexing agents, i.e. citric acid and phosphoric acid imparted significant effects on improving the removal efficiency of sulphur and ash contents. Under optimized conditions, it was found out that the addition of citric acid improved the removal efficiency for sulphur from 63.88 to 83.47% and from 33.12 to 66.25% for ash. In case of phosphoric acid, the removal in sulphur and ash contents was increased from 63.77 to 80.77% and from 33.12 to 59.18%, respectively. Apparently, citric acid happened to be the most effective complexing agent, as compared to phosphoric acid. These results warrant subsequent detailed studies for further optimization of the process, including the use of some other complexing agents, as well.

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Effect of elevated temperature and pressure on the leaching characteristics of Indian coals

Cited by 31 publications

References 24 publications

Leaching and Releasing Characteristics and Regularities of Sb and As from Antimony Mining Waste Rocks

Leaching and Releasing Characteristics and Regularities of Sb and As from Antimony Mining Waste Rocks

Data on trace element concentrations in coal and host rock and leaching product in different pH values and open/closed environments

Effect of complexing agents on desulphurization and deashing of coal by H₂O₂/H₂SO₄ leaching

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Effect of elevated temperature and pressure on the leaching characteristics of Indian coals

Cited by 31 publications

References 24 publications

Leaching and Releasing Characteristics and Regularities of Sb and As from Antimony Mining Waste Rocks

Leaching and Releasing Characteristics and Regularities of Sb and As from Antimony Mining Waste Rocks

Data on trace element concentrations in coal and host rock and leaching product in different pH values and open/closed environments

Effect of complexing agents on desulphurization and deashing of coal by H2O2/H2SO4 leaching

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Effect of complexing agents on desulphurization and deashing of coal by H₂O₂/H₂SO₄ leaching