1. Introduction. Coal gasification technology is essential to achieve the clean and efficient utilization of coal, but it still faces significant challenges [1, 2].For example, with the large-scale application of entrained-flow coal gasification technology in China, coal gasification fine slag (CGFS) composed of residual carbon and inorganic minerals is produced in a large amount …
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A large amount of silicon slag is inevitably produced during the smelting and purification process of silica sand. The recycling of silicon from industrial silicon slag has become an urgent problem in the silicon production industry. In this study, the aim is to separate and recover silicon with purity above 95% by flotation method and to ensure recovery rate above …
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Flotation Tests. The slag was crushed in a jaw crusher and ground in a ball mill and then sieved. N-ethyl-O-isopropyl thiocarbamate (Z-200), ethyl xanthate, butyl xanthate, isopentyl xanthate and butylamine dithiophosphate were used as collectors; terpineol oil as frother; sulphuric acid, lime, sodium hydroxide and sodium carbonate as pH regulator.
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Emulsion collector can significantly improve the combustible recovery for coal gasification fine slag flotation. The Fuerstenau upgrading curve was applied to gasification …
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Ultimately, silicon can be recovered from the MG-Si refined slag by flotation. However, for the oil concentrations greater than 250 g/t, the contact angle increased further, while silicon recovery decreased. This may be because excess oil can provide more hydrophobic groups and enhance the hydrophobicity of silicon. It also affects the ...
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The separation of copper and arsenic has always been a major problem of the flotation beneficiation process, which is affected by the multiple factors: the chemical speciation and mineralogical structure of elements in slag as well as the processing conditions such as pH of the pulp, the concentration of agents and the number of additives, etc. (Ma et al., 2016; Alter, …
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Coal gasification fine slag (CGFS) is a significant source of solid waste requiring improved treatment methods. This study primarily investigates the mechanism of ultrasonic treatment in optimising flotation-based decarbonization of CGFS and its impact on CGFS modified with surfactants. The objective is to maximise the carbon ash separation effect to support the …
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Comparing the fine slag and flotation residual carbon, surface area decreases from 145 to 111 m²/g, pore volume increases from 0.1288 to 0.1833 cm³/g, and average pore width increases from 5. ...
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Copper slag flotation was studied on an industrial scale at a concentrator plant in the region of Atacama, Chile. This study consisted of the physical, chemical, and mineralogical characterization of the copper slag, along with preliminary flotation tests. This article focuses on industrial flotation, which consisted of two oneyear campaigns ...
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More than 30 million tons of coal gasification slag (CGS) are produced annually in China, and the primary disposal methods are piling and landfilling, resulting in significant land resource waste and potential environmental pollution(Lv et al., 2023a).Coal gasification slag including both coarse and fine slag, is composed of carbon and minerals such as silica …
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The conventional flotation method fails to meet the demands for efficient carbon extraction from coal gasification slag. Specialized flotation techniques such as ultrasonic, micro, and nanobubbles should be employed to enhance the flotation process and achieve superior carbon extraction efficiency. Therefore, a combination device of ultrasonic ...
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Coal plays an important role in China's energy [1], [2], [3].The coal gasification process is a significant approach to the clean utilization of coal [4], [5], [6].Coal gasification slag, as an industrial solid waste generated during the process, contains abundant aluminosilicate, ash components, and carbon residue [7], [8].The coal gasification process in China results in the …
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A particle mineralogical map for flotation slag sample (Fig. 1) shows the free fayalite, free bornite, locked fayalite with bornite and magnetite. It has been observed that the sulphide minerals occur as very fine grained; mostly present as inclusions within the host fayalite minerals. Magnetite occurs as small euhedral and subhedral grains ...
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In this work, based on the discovery of the covering between CGFS particles, the selective dispersion flocculation flotation method is proposed to improve the efficient …
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In this process, the zeta potential of carbon slag and ash slag decreased from −17.43 and −11.77 mV to −23.45 and −29.80 mV, respectively. The greater change of zeta potential of ash slag indicates its stronger adsorption of APAM, leading to the higher flocculation trend of ash particles than that of carbon slag.
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Coal gasification fine slag (CGFS) is a significant source of solid waste requiring improved treatment methods. This study primarily investigates the mechanism of ultrasonic treatment in optimising flotation-based decarbonization of CGFS and its impact on CGFS modified with surfactants. The objective is to maximise the carbon ash separation effect to support the clean …
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Li (Li, 2021) selected the flotation reagent with diesel collector as the main body, compounded the surfactants DTAB, TX-100, and SDS with diesel at mass ratios of 1%, 5%, and 10%, respectively, and explored their influence on flotation of gasification slag. The adsorption morphology and interaction energy between the surfactant and different ...
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Copper slag flotation was studied on an industrial scale at a concentrator plant in the region of Atacama, Chile. This study consisted of the physical, chemical, and mineralogical characterization of the copper slag, along with preliminary flotation tests. This article focuses on industrial flotation, which consisted of two one-year campaigns ...
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Coal gasification is a promising clean coal technology that converts fuel into synthetic gas at high temperatures [1], [2].Coal gasification fine slag (CGFS), as a waste by-product of the coal gasification process, is composed of residual carbon and inorganic minerals [3].Over 33 million tonnes of CGFS are produced annually in China, which has led to the issue of the proper …
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Flotation experiments performed on metallurgical grade silicon have demonstrated that silicon (Si) can be floated in diluted solutions of hydrogen fluoride (HF) and a frother. The recovery was found to depend on HF conditioning time, frother type, and the concentration of both HF and frother. Although Brij 58 produced the highest recoveries of the frothers that was …
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Various flotation reagents that are commonly used for copper flotation were identified, selected and used during the flotation test work in order to identify the best reagent …
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In this study, iron selectivity behaviour of copper smelter slag (CSS) flotation tailings (38.08% Fe, 0.35% Cu, 4.48% Zn, 0.16% Co, 0.37% S) having fayalite and magnetite as major minerals was ...
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This review summarizes and analyzes the main reasons for the flotation process of coal gasification slag from three aspects (the flotation basis of minerals, difficult flotation, and difficulty of selection). The analysis is based on the development of an efficient collector for CGFS flotation, pretreatment of raw materials before flotation ...
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When the copper in the slag is largely in sulfide phases, flotation of copper slag is similar to sulfide ore flotation of copper. 64−69 In the flotation of copper slag, oxides, alloys, and metallic phases containing Co and Ni are generally depressed and concentrated in the tailings. 6 Hence, copper slag flotation tailings (SFT) may contain ...
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Dodecylamine enhanced coal gasification fine slag flotation and its molecular dynamics simulation. Feng Gao Lianping Dong +6 authors Jiancheng Wang
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The subsequent ferric leaching of copper converter slag flotation tailings containing 0.53% copper and 2.77% zinc with the pregnant leach solution was conducted. The effects of various process ...
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The results of the tests on slow-cooled slag show that high recoveries of copper can be obtained in flotation concentrates that could be recycled to the reverberatory furnace. …
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The recovery of copper and cobalt from ancient copper slags from the Küre region of Turkey was investigated. A fayalitic-type of ancient copper slag containing 1.24% Cu, 0.53% Co and 53.16% Fe ...
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