Preparation and application of porous materials from coal gasification
Coal gasification slag (CGS) is a solid waste produced in the process of coal gasification reaction. Coal gasification is the process of reacting coal with gasification agents (hydrogen, air, oxygen, and water vapor) at a certain temperature and pressure to convert the combustible part of coal into combustible gas, while the ash in coal is …
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Peroxymonosulfate activation by iron-carbon composite derived from coal
In this work, a novel Fe-C composite derived from coal gasification slag was successfully fabricated and employed in SMX degradation via PMS activation. The optimized Fe-C composite (CGS-1000) could remove 91.1 % of SMX in 90 min with 2.0 mM PMS dosage and 0.2 g/L catalyst dosage.
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Integration of coal gasification and waste heat recovery …
Three samples were prepared using the foregoing materials, i.e., a raw steel slag sample (S0), a raw coal sample (S1) and a mixture with the mass ratio of coal sample to steel slags of 1:1 (S2 ...
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Carbon mineralization of steel and iron-making slag: Paving …
(29) 2HA + iron slag ↔ 2H + + DA 2 (D = divalent metal species such as Ca 2+, Mg 2+, and Fe 2+) (30) 3HA + iron slag ↔ 3H + + T 2 A 3 (T = trivalent metal …
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Effect of Iron Phase Evolution on Copper Separation from Slag Via Coal
Copper slag, a by-product of copper pyrometallurgy, inevitably contains a certain amount of copper. Oxygen-enriched smelting technologies increase the copper content in slag indirectly because of the production of higher-grade matte. The effect of iron phase evolution on the copper content in slag during the slag cleaning process in …
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Extraction and separation of copper and iron from copper …
Firstly, copper is extracted from CSS by flotation method, and then iron is extracted from flotation tailings by microwave fluidization roasting and high-efficiency …
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Correlating the Slagging of Utility Boiler
ABSTRACT. This paper will describe how a utility was able to correlate intermittent slagging problems a boiler was experiencing with coal ash chemistry. The coal ash fusion temperatures alone were not sufficient to be able to separate the good versus poor performing coals. Further investigation revealed that the iron levels in the coal ash, and ...
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Effect of Coal Gasification Fine Slag on the Physicochemical …
Coal gasification fine slag (CGFS), which is the by-product of entrained-flow coal gasification, has superior properties, such as a large surface area, a broad pore size distribution, and a high content of carbon. This material has the potential to amend poor soils. This study was carried out to investigate the use of CGFS as a soil amendment for …
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Iron Recovery from Waste Copper Slag by Using Coal and
In this work, a new and carbon-free reductant, i.e., secondary aluminum dross, is used to replace coal to recycle valuable metals from copper slag by smelting reduction. The influence of substitution ratio on slag properties and metal recovery was investigated. The results show that the metal recovery is mainly determined by the …
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Investigating the synergistic effects of magnesia-coal slag …
The synergy of magnesia-coal slag based cementitious materials (MCC) is revealed. • The addition of 5 % desulfurized gypsum is beneficial to improve the strength of MCC. • The 10 % addition of coal gasification slag contributes to the strength of the MCC. • The increased strength of MCC is due to the formation of C-S(A)-H and AFt gels. •
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The precipitation of metallic iron from coal ash slag in the …
In comparison to that of the raw coal slag, the LT calculated by FactSage software of each slag sample decreases with the addition of iron-bearing minerals. The more the high-melting-point mineral ...
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Dissolution of Cr2O3 into Coal Slag and Its Impact on Slag …
In this work, the dissolution of Cr 2 O 3 into coal slag is calculated by FactSage software, and its impact on ash fusion temperatures and slag viscosity are investigated. The Cr 2 O 3 concentration of coal slag increases from 0.5 to 4 wt % as the operation temperature rises (1300–1600 °C). Cr 2 O 3 reacts with FeO to form the high …
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Simultaneous adsorption of Cd and As by a novel coal gasification slag
A series of iron-modified coal gasification slag (IGS) composites IGS3/5/7/9/11 (with different pH values) were synthesized by alkali fusion and iron impregnation. After modification, carboxyl groups were activated, and Fe was successfully loaded onto the surface of IGS in the form of Fe O and Fe 2 O 3. The IGS7 exhibited the …
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Recovery of Iron from Lead Slag with Coal-Based Direct …
Under the conditions of weight ratio of slag: coal: CaO as 50:15:5, the roasted temperature of 1250 °C for 45 min, and then two stage of grinding and twice magnetic …
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Review of the characteristics and graded utilisation of coal
Yang et al. [22] and Zhao et al. [17] analysed the chemical compositions of fine slag from the Ningxia Coal Industry Group Co., Ltd. Texaco gasifier, four-nozzle opposite gasifier and GSP coal gasifier, and concluded that the gasification slag was mainly composed of SiO 2, Al 2 O 3, CaO, Fe 2 O 3, MgO and C.In addition, notable …
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Study on Extraction Valuable Metal Elements by Co-Roasting …
The results demonstrate that the leaching rate of total iron (TFe) reached 79.93%, and Al 3+ achieved 43.78% under the optimized experimental conditions (co …
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Effect of Iron Phase Evolution on Copper Separation from …
The effect of iron phase evolution on the copper content in slag during the slag cleaning process in an electric furnace was investigated using the method of …
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Viscosity and Structural State of Iron in Coal Ash Slags under
This article is cited by 39 publications. Peter Y. Hsieh. Estimating the Iron Valence Distribution of Synthetic Coal Ash Slags through Thermophysical Modeling.
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Slag Driveway Pros and Cons
Because of the slag's high traction, the driveway is not as slippery as stone or concrete driveways. This is important in wet and icy conditions, even for pedestrians. A slag driveway will have a longer lifetime and less wear. ... There can be variability in the size of the slag depending on the iron production process. The water absorption ...
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Behavior of liquid passing through deadman: influence of slag/iron …
The ability of a blast furnace hearth liquid (iron and slag) passing through deadman characterizes the activity of the blast furnace hearth. To explore the influence of various factors on the static holdup rate of liquid in the process of passing through the deadman, a physical transport model of liquid passing through the deadman was firstly …
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Integration of coal gasification and waste heat recovery from …
Here we report a novel approach to extract the waste heat and iron from high temperature steel slags (1450–1650 oC) produced in the steel industry, i.e., …
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Measurement and simulation of flow properties of coal ash slag in coal …
The modified Einstein equation and Einstein–Roscoe equation have been used to describe the viscosities of heterogeneous coal ash slag samples of ϕ < 10.00 vol % and ϕ ≥ 10.00 vol %, respectively. These three models provided a good description of the experimental data of fully liquid and heterogeneous coal ash slag samples.
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Extraction and separation of copper and iron from copper smelting slag
China's copper resources are characterized by low grade and complex composition. A large amount of copper smelting slag (CSS) containing valuable elements such as copper and iron is produced through smelting. With the increasing shortage of copper resources, the full recovery of valuable elements in CSS plays an important part …
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Kinetics of copper extraction from copper smelting slag by …
The leaching rate of copper and iron or silicon was 97% and less than 2% respectively when copper slag is treated by oxygen pressure acid leaching process, which can achieve the purpose of limiting the leaching of Si and Fe while highly selective leaching of valuable metals under low acidity and energy consumption conditions [12], [13], [14 ...
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Coal slag VS Aluminum Oxide for Sandblasting | Pittsburgh …
Coal Slag is one of the most readily available blast medias in most areas. It is ideal for removing medium – Heavy amounts of paint and for prepping surfaces for coating application for a profile range of 2- 6 Mils depending on the coarseness of media used. It turns to dust on impact which can help with clean up if reclamation is not important.
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Life Cycle Assessment of Internal Recycling Options of Steel Slag …
Four sce- narios for steel slag treatment and management strategies are developed. 1.2 System description and boundary The main processes within the system are: ex- traction of raw material (including iron ore mining and processing, coal extraction, limestone extrac- tion, etc. 1, coal washing, coke making, sintering, quick lime making, …
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Iron transformation behavior in coal ash slag in the …
The SiO 2, Al 2 O 3, Fe 2 O 3 and CaO are the main components of coal ash, and they act as crucial roles on slag viscosity. The effects of SiO 2, Al 2 O 3 and CaO on slag viscosity have been conducted by many researchers [3], [5].The network theory describes the influence of chemical composition on the viscosity of silicate melts (coal …
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Critical review of applications of iron and steel slags for …
The main objectives of our study is to review: (1) the various carbon sequestration techniques; (2) the application of iron and steel slag in carbon sequestration; (3) the applications of iron and steel slag in the environmental remediation, (4) carbon sequestration mechanism of steel slag; (5) mechanisms for environmental remediation …
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