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Coal gangue is one of the largest mine solid wastes in China, and its discharge and stockpiling have caused resource waste, environmental pollution and other problems. Starting from the resource …
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High-sulfur coal gangue was continuously immersed in a proline solution and in deionized water (as a control treatment) for 540 days. ... can effectively limit the …
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YANG et al [74] replaced the traditional acid (sulfuric acid) activation system with a combination of small- molecule organic matter and salt compound K3 (Fe(CN)6) as an activator + butyl xanthate + No. 2 oil. The closed-circuit test resulted in aluminium oxide concentrate with sulfur content of 0.43%, and Al2O3 recovery of 92.71%.
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Batch experiments were conducted to comparatively evaluate the inhibition effects and mechanisms of a low-concentration (1%) proline solution cover on the release of pollutants from high-sulfur coal gangue. High-sulfur coal gangue was continuously immersed in a proline solution and in deionized water (as a control treatment) for 540 …
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The accumulation of coal gangue (CG) from coal mining is an important source of heavy metals (HMs) in soil. Its spatial distribution and environment risk assessment are extremely important for the management and remediation of HMs. Eighty soil samples were collected from the high-sulfur CG site in n …
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Coal gangue is an industrial solid waste inevitably produced in coal mining and coal washing, and its emissions account for approximately 10%–15% of coal production (Zhou et al. 2014a, b).China is the country with the highest coal production in the world, and a large amount of coal gangue waste is piled on the surface at mining …
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Carrillo-Pedroza et al. [33] found that H 2 O 2 and O 3 could also be used as oxidants to enhance the desulfurization performance of Mexican sub-bituminous coal in acidic solutions (nitric acid, sulfuric acid and hydrochloric acid). High sulfur coal was desulphurized in acetic acid-H 2 O 2 (volume ratio is 1:5) system by microwave heating …
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The growth of A. ferrooxidans YQ-N3 versus the gangue bacterial cell numbers are displayed in Fig. 1.In the first 20 days of the coal gangue oxidation, the cell concentration of A. ferrooxidans YQ-N3 indicated a mid-logarithmic growth phase with the gangue bacteria exhibiting continuous growth for the entire 50-day experiment, …
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The main chemical composition of the acid leaching residue obtained after the sulfuric acid leach treatment was shown in table 2. The main chemical composition of acid leaching residue was SiO 2, with a content of 79.1%, which contained a small amount of non-leached Al 2 O 3, CaO and Fe 2 O 3. The XRD patterns of leaching residue was …
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High-sulfur coal gangue (HS-CG) is extremely unstable in the environment, releasing acid mine drainage with high concentrations of harmful heavy metals (HMs). The effects of HS-CG particle size, leaching solution pH, Fe 3+ and acidophilic microorganisms on the release of HMs from the HS-CG and their kinetic behavior were studied using …
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The criteria of purity and accuracy of grade are the primary goals of sulfuric acid production. The contact process is almost universally used to convert sulfur dioxide to sulfuric acid. In this process, sulfur dioxide is oxidized by atmospheric air at high temperatures and in the presence of a vanadium pentoxide catalyst.
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Recovery of lithium from coal gangue utilizing acid baking followed by water leaching, International Journal of Coal Preparation and Utilization, ABSTRACT With the rapid development of the lithium ...
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Batch experiments were conducted to comparatively evaluate the inhibition effects and mechanisms of a low-concentration (1%) proline solution cover on the …
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The soil sulfur (S) was detected to be much higher in the soil of GP than CK-near and CK-far plots. CK-near soil contained 0.1 ± 0.06% sulfur, and GP had 1.0 ± …
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A geometallurgical model, linked to simple ore body characteristics, was established to understand short- and long-term gangue acid consumption (GAC) …
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High-sulfur coal gangue (HS-CG) is extremely unstable in the environment, releasing acid mine drainage with high concentrations of harmful heavy metals (HMs).
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Introduction. Coal gangue (CG) is the main by-product of coal mining and washing industry, and its production is about 10%-15% of the coal mining amount (Li et al., 2018).The huge demand for coal resources leads to the continuous production of CG (Wang et al., 2018).As a common solid waste of mine, CG was usually deposited …
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In this paper, the occurrence modes of Li, Ga, and REEs in coal gangue were studied by sequential chemical extraction method. The extraction of valuable critical metals from the coal gangue was systematically studied by roasting activation-sulfuric acid leaching process, and the activation mechanism was elucidated.
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DOI: 10.1016/j.jclepro.2022.131615 Corpus ID: 247925396; Co-hydrothermal carbonization of sewage sludge and coal slime with sulfuric acid for N, S doped hydrochar @article{Yang2022CohydrothermalCO, title={Co-hydrothermal carbonization of sewage sludge and coal slime with sulfuric acid for N, S doped hydrochar}, author={Xiaoyang …
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Hydrochloric acid is a common industrial waste acid, although its demand is not as high as sulfuric acid; therefore, using hydrochloric acid could provide a certain reference for industrial …
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2.1.3.6.2 H 2 O 2 Process. Use of H 2 O 2 can oxidize the SO 2 to SO 3 which is then used to produce sulfuric acid. However, due to the high cost of H 2 O 2 …
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High-pressure acid leach (HPAL) residue from laterite nickel ore is a potentially valuable resource for ironmaking; however, its efficient utilization is hindered by its high sulfur content. In this study, an effective and straightforward method is proposed for sulfur removal from HPAL residue. The process involves sieving and sodium …
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A novel technique was developed for the recovery of lithium and aluminum from coal fly ash using a combination of pre-desilication and an intensified acid leaching process.
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Chemical industry - Sulfuric Acid, Manufacturing, Uses: Sulfuric acid is by far the largest single product of the chemical industry. The chamber process for its preparation on the scale required by the Leblanc process might be regarded as the most important long-term contribution of the latter. When sulfur is burned in air, sulfur dioxide is formed, and this, …
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Global sulfuric acid market Most of the sulfur produced worldwide is transformed into sulfuric acid, an important commodity chemical with many applications. ... "Production of sulfur worldwide in ...
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1.2. Source and distribution of CG in China. CG is a kind of black gray shale rock produced in the process of coal production. China is the world's largest coal producer (Munir et al., 2020) and also the largest coal consumer.Coal provides about 62% of China's energy demand (Mita et al., 2015).In the process of sorting and processing, the production of …
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Experimental coal gangue was obtained from a coal mine in Wangwa, Ningxia. The main components of coal gangue was analyzed with GB/T1574—2007 Coal Ash Component Analysis Method, and the result indicated a composition of 37.85% SiO 2, 18.14% Fe 2 O 3, 17.35% Al 2 O 3, 4.19% TiO 2, 5.35% CaO, 1.12% MgO and 15.48% …
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Eliminating fossil fuels to rein in climate change will slash the annual supply of sulfuric acid just as demand is increasing. The world already uses over 246 million tonnes of sulfuric acid ...
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industrial method for the production of H 2 SO 4. The process involves the oxidation of sulfur dioxide (SO 2) to sulfur xide (SO 3), which is then dissolved in water to produce sulfuric acid ...
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DOI: 10.1016/j.chemosphere.2021.132382 Corpus ID: 238250892; Improved holding and releasing capacities of coal gangue toward phosphate through alkali-activation. @article{Ye2021ImprovedHA, title={Improved holding and releasing capacities of coal gangue toward phosphate through alkali-activation.}, author={Tiantian Ye and …
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