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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 …
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 …
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 …
Pyrite (FeS 2) is the most abundant and widely spread iron-containing sulfide mineral in the earth, and it is also an important source of sulfuric acid (H 2 SO 4) and is commonly associated with the other valuable minerals as gangue mineral.Hence, it cannot be ignored in the modern industry, especially in the mining industry. Bio-oxidation …
A geometallurgical model, linked to simple ore body characteristics, was established to understand short- and long-term gangue acid consumption (GAC) …
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, …
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 …
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 …
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%.
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 ± …
Medium and high sulfur coal gangue (MHSCG) presents challenges for safe application on civil engineering building materials due to the high content of unstable pyrite, of which the acidic oxidation products are against alkali cementitious materials.For better utilization of MHSCG, in this research, the carbonate-inducing bacterium Sporosarcina …
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 …
The extraction of valuable critical metals from the coal gangue was systematically studied by roasting activation-sulfuric acid leaching process, and the …
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 …
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.
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 …
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 …
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.
A geometallurgical model, linked to simple ore body characteristics, was established to understand short- and long-term gangue acid consumption (GAC) variability for a new copper sulfide chemical heap leaching process under standard metallurgical conditions, including an acid dose of 12 kg/t sulfuric acid during agglomeration at a …
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.
Currently, high sulfur gangue is produced 700–800 million tons a year in China, where the storage has already reached to 6 billion tons [25]. MHSCG occupies the most proportion in coal gangue production [26], and its sulfur in MHSCG mainly comes from pyrite (FeS 2), a mineral that contains S-which can be easily oxidized [27].
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 …
1. Introduction. Coal gangue (HS-CG) is the dark-gray rock produced during coal mining and washing process, and its production is about 10%–15% of coal mining, which depends on the geology and mining conditions (Zhu et al., 2020; Bai et al., …
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 …
1. Introduction. Coal gangue is one of the largest industrial residues in China that is discharged during the processing and utilization of coal (Gu, 1997, Liu and Liu, 2010).With continuous growth of coal mining and coal cleaning, a large amount of coal gangue are produced, which contain sulfide minerals, alumino-silicates minerals, other …
Step 3: Converting sulfur xide into sulfuric acid. This cannot be done by simply adding water to the sulfur xide; the reaction is so uncontrollable that it creates a fog of sulfuric acid. Instead, the sulfur xide is first dissolved in concentrated sulfuric acid: [ H_2SO_{4 (l)} + SO_{3(g)} rightarrow H_2S_2O_{7 (l)} label{4}]
High-sulfur coal gangue (HS-CG) is extremely unstable in the environment, releasing acid mine drainage with high concentrations of harmful heavy metals (HMs). ... However, the concentration of Fe 3+ above 800 mg/L promoted the production of jarosite on the surface of HS-CG, which led to decrease in the release of HMs. The HMs forms …
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, …
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 …
High-sulfur coal gangue (HS-CG) is extremely unstable in the environment, releasing acid mine drainage with high concentrations of harmful heavy metals (HMs). …
High-sulfur coal gangue (HS-CG) is extremely unstable in the environment, releasing acid mine drainage with high concentrations of harmful heavy metals (HMs).
1. Introduction. Coal has been used in China for decades, as one of the most vital natural energy sources supporting its high-speed economic development (Ünal et al., 2018).During the exploitation of coal-mines, many environmental problems, including water pollution, ground subsidence, and generation of a plethora of harmful by-products, have …
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 …