Water slag alkalinity

Ettringite and monosulfate formation to reduce alkalinity in

2019年2月1日  In batch and column leach tests, 10% alumbased water treatment residual (WTR) addition to aged steel slag resulted in a 67% decrease in acid neutralizing capacity of 2023年1月1日  Slag is the main raw material of alkaliactivated slag concrete (AASC) It is an active mineral material with potential hydraulicity The annual global output of slag is nearly Hydration Characteristics and Microstructure of AlkaliActivated 2024年6月16日  Ocean alkalinity enhancement (OAE) via the enhanced weathering of alkaline minerals is a promising carbon dioxide removal (CDR) technology Theoretically, these includes iron and steel slags, although their Carbon dioxide removal efficiency of iron and steel To understand the geochemistry of the alkaline ground water system, we analyzed samples of ground water and the associated slag and weathering products from four sites We also Geochemistry of Extremely Alkaline (pH [ 12) Ground Water in Slag

The hydration of slag, part 1: reaction models for alkaliactivated

2006年11月29日  Reaction models are proposed to quantify the hydration products and to determine the composition of C–S–H from alkaliactivated slags (AAS) Products of the slag 2021年3月5日  Slags were characterised for pH, calcium and magnesium content (alkalinity, A), silicon content, 5 day Na 2 CO 3 + NH 4 NO 3 extractable Si content, and alkalinity to Si ratio Alkalinity–silicon ratio as an assessment factor for the efficiency 2021年6月15日  In this study, most of the alkaline components of steel slag are released in water after the first step of leaching, and free calcium oxide is the main determinant of steel slag's Research on Indirect Carbonation of Twostep Leaching for the 2024年11月22日  The electrochemical water softening technique has the advantages of environmental friendliness, energy saving, and no secondary pollution However, the easy Improvement of Electrochemical Water Softening Treatment Using

Advances in Understanding the Alkali‐Activated

2021年5月25日  This paper summarized and reviewed the mechanism and macroperformance of alkaliactivated metallurgical slag, including steel slag, copper slag, ferronickel slag, and leadzinc slag Better activated method and 2018年8月7日  Alkalinity is not a chemical in water, but, rather, it is a property of water that is dependent on the presence of certain chemicals in the water, such as bicarbonates, carbonates, and hydroxides A definition of alkalinity would Alkalinity and Water US Geological Survey2015年6月25日  Discharge chemistry Slag drainage waters sampled were typified by very high pH and alkalinity and exceeded predefined Environmental Quality Standards (EQS) prescribed in the UK for aquatic life for pH at both the Dene and Howden Burn (Table 1)Metal concentrations within leachateaffected streams were also elevated and characteristic of the parent material Longterm evolution of highly alkaline steel slag drainage waters2015年9月18日  Treatment methods that include coating steel slag with bitumen, bathing steel slag in either Fe(III), Al(III), or PO 4 (III), and mixing steel slag with an alumbased drinking water treatment residual (WTR) were designed and evaluated based on reduction in Ca release, pH, and alkalinity in the leachate of treated steel slag samplesTreatment Methods for Mitigation of High Alkalinity in

Formation mechanism of carbide slag composite sustainedalkalinity

Due to the fast alkalinity release rate of carbide slag, the service life may be shortened ˛erefore, it is necessary to modify and reduce the alkalinity release rate In the presence of silicate 2019年2月1日  The constituent in WTR, which mainly drives alkalinity mitigation effect, was presumed to be amorphous Al(OH) 3To investigate the effect of uncontaminated Al(OH) 3 on steel slag, an Al(OH) 3 precipitate was prepared by dissolving hydrated Al 2 (SO 4) 3 xH 2 O (Alfa Aesar, Ward Hill, MA, >97%) in DI water and the pH was raised to 70 by NaOH additionEttringite and monosulfate formation to reduce alkalinity in 2005年11月1日  Request PDF Geochemistry of Extremely Alkaline (pH > 12) Ground Water in SlagFill Aquifers as well as high alkalinity in water Additionally, by means of geophysical surveys, Geochemistry of Extremely Alkaline (pH > 12) Ground Water in Slag 2015年6月25日  Processes such as these, which occur as water percolates through steel slag deposits, contribute towards increased hydroxide (OH −) alkalinity of waters (Roadcap et al 2005) This weathering also increases the concentration of dissolved Ca at high pH, the reason for the positive pHCa correlations identifiedLongterm evolution of highly alkaline steel slag drainage waters

Alkaline residues and the environment: a review of impacts,

2016年1月20日  Steel slag leachate altered the alkalinity, pH, and calcium, and magnesium concentrations in a small Pennsylvania stream, Nine Mile Run, and fish were absent in the water course where pH > 10 (Koryak et al, 2002)2024年1月17日  The intrinsic mechanism and impact process of how coal gasification coarse slag (CGCS) amends the physicochemical properties of a specific soil based on its properties are not yet clear The study explored the properties of CGCS that can be used for soil amendment by evaluating the properties of topsoil and CGCS Different CGCS additions (0%, 5%, 10%, 15%, Use of coal gasification coarse slag to amend the soil water, 2012年4月13日  The influences of different alkaline conditions on the kinds and morphologies of steel slag’s hydration products, Ca(OH)2 content of hydration products, pore structure of hardened paste, nonevaporable water content of hydration products, and strength of steel slag mortar were investigated by changing the initial alkalinity of the hydration condition of steel Influence of initial alkalinity on the hydration of steel slag Springer2019年2月1日  Request PDF Ettringite and monosulfate formation to reduce alkalinity in reactions of alumbased water treatment residual with steel slag Aged steel slag has a potential use as a highly Ettringite and monosulfate formation to reduce alkalinity in

The mineral phase evolution characteristics and hydration activity

2024年3月25日  During the slow cooling process of steel slag, crystals of the inert ore phase (C 2 F) and active ore phase (C 2 S, C 3 S) grow dependently, and the irregular interlacement and coating between ore phases strongly affect the hydration activity of the active ore phase in steel slag Therefore, in this article, a typical alkaline activator, NaOH, was selected, the solvent 2008年5月28日  Drainage from steel slag disposal sites can be extremely alkaline and a source of pollution to surface and ground waters Data is presented detailing the hydrogeochemistry of seven highly alkaline (pH > 10) steel slag surface discharges in the UK While there is the consistent presence of Ca–OH type groundwater in all the discharges, there are clear Hydrogeochemistry of Alkaline Steel Slag Leachates in the UK2023年12月9日  This work proposes a promising alternative to the usual materials and methods of dense ceramic membrane synthesis, focusing on the green exploitation of phosphoric acid industry waste Alkaliactivated ceramic membranes (AACM) were fabricated using two simple steps: alkaliactivation, and steam curing The performance of slag as a cementitious material Phosphoric Acid Industry Waste Valorization Through Fabrication The role of Total Alkalinity in water chemistry If you’re a pool operator, you probably already know that pH fluctuates In particular, it naturally rises Correcting pH is almost always accomplished by lowering it with acid or injecting CO 2Total Alkalinity vs pH, and their roles in water chemistry

pCO2 decrement through alkalinity enhancement and biological

2023年10月1日  Semantic Scholar extracted view of "pCO2 decrement through alkalinity enhancement and biological production in a shallowwater ecosystem constructed using steelmaking slag" by Wataru Nakamura et al2024年1月16日  Abstract Ocean alkalinity enhancement (OAE) is an emerging approach for atmospheric carbon dioxide removal (CDR) The net climatic benefit of OAE depends on how much it can increase CO2 sequestration relative to a baseline state without OAE This socalled “additionality” can be calculated as follows: Additionality=COAEΔCbaseline So far, feasibility The additionality problem of ocean alkalinity enhancement2024年1月1日  Abstract Steel slag (S) is a byproduct of the steel industry with an annual global production of 280 MMT A significant amount of the S is landfilled, causing economic loss and waste of valuable land space S is deemed to have great potential as an aggregate because of its mechanical properties; however, the high swelling potential and alkalinity caused by large pHDependent Leaching Characteristics of Steel Slag Mitigated 2024年4月28日  Steel slag is a byproduct of the steel industry and usually contains a high amount of fCaO and fMgO, which will result in serious soundness problems once used as a binding material and/or aggregates To relieve this negative effect, carbonation treatment was believed to be one of the available and reliable methods By carbonation treatment of steel A Review on the Carbonation of Steel Slag: Properties, Mechanism

pCO2 decrement through alkalinity enhancement and biological

2023年11月1日  Oceanbased carbon dioxide removal has gained immense attention as a countermeasure against climate changeThe enhancement of ocean alkalinity and the creation of new blue carbon ecosystems are considered effective approaches for this To evaluate the function of steelmaking slag from the viewpoints of CO 2 reduction and creation of new blue 2022年2月14日  In fact, SW has high alkalinity (pH value around 865) in comparison with TW (pH value around 76) Accordingly, as the water alkalinity increased as the mixture flowability increased From the discussions and the conclusions, it can be confirmed that seawater can be used as mixing water for alkaliactivated slag system, An investigation of using seawater as mixing water for alkali 2023年10月1日  Request PDF pCO2 decrement through alkalinity enhancement and biological production in a shallowwater ecosystem constructed using steelmaking slag Oceanbased carbon dioxide removal has pCO2 decrement through alkalinity enhancement and biological 2023年2月4日  Remediation of Acid Mine Drainage (AMD) Using Steel Slag: Mechanism of the Alkalinity Decayed Process mesh size was mixed with 100 mL deio n ize d water under a rotat i ng speed o f 100 r/mi n (PDF) Remediation of Acid Mine Drainage (AMD) Using

pCO2 decrement through alkalinity enhancement and biological

2023年10月25日  Oceanbased carbon dioxide removal has gained immense attention as a countermeasure against climate change The enhancement of ocean alkalinity and the creation of new blue carbon ecosystems are considered effective approaches for this To evaluate the function of steelmaking slag from the viewpoints of CO2 reduction and creation of new blue 2024年6月17日  Olivine and steel slag additions increased total alkalinity by 29 and 361 µmol kg−1, respectively, corresponding to a respective theoretical increase of 09 % and 148 % of the seawater storage Carbon dioxide removal efficiency of iron and steel slag in 2016年4月22日  waterglassactivated slag systems, no signi permeability, higher alkalinity of the pore solution, and low CaO/SiO 2 ratio in the AAS system Decalci A review on durability of alkali activated fly ash/slag systems 2023年5月11日  If the water containing carbonate hardness enters the boiler, the alkalinity in the pot water will be reduced due to the generation of carbonate scale or slag; if the softened water is used as boiler feed water, the alkalinity in the pot water will increase as the boiler evaporates and concentrates because the softened water only removes the What are water hardness and alkalinity? What is the relationship

Steel plant slag dumps: A potential source of groundwater

2022年2月3日  Casilicates such as rankinite (Ca 3 Si 2 O 7), larnite (Ca 2 SiO 4) and akermanite (Ca 2 MgSi 2 O 7) may also provide hydroxide alkalinity (Roadcap et al 2005) Over time, less attention has been given to the effect of steel slag dump on the hydrogeological ground water in slagfill aquifers; Groundwater 43(6) 806–816 2021年5月25日  The content of free CaO increases with the alkalinity of steel slag And, EFFS can be divided into aircooled slag and watercooled slag depending on different cooling methods Generally, EFFS generated from laterite ore contains a high FeO/Fe 2 O 3 and low MgO, whereas that from garnierite ore contains low Fe 2 O 3 and high MgO Advances in Understanding the Alkali‐Activated Metallurgical Slag 2024年10月15日  Carbide slag (CS) is a typical alkaline solid waste with Ca(OH) 2 as its main component, exhibiting a high capacity for CO 2 mineralization Currently, the methods for CS mineralization of CO 2 include direct and indirect mineralization which the initial pH of the reaction system plays a crucial role in the mineralization process In this study, we explored the effects Optimizing carbonation reaction parameters of calcium carbide slag 2014年10月29日  Steel slag leach beds (SLBs) are a relatively new treatment system for acid mine drainage (AMD) Approximately 20 largescale (90–3,700 m 3) SLBs are currently installed across southeastern Ohio for the purpose of treating AMDSLBs are excavated ponds partially filled with steel slag, through which water flowsGeochemistry of CO2 in Steel Slag Leach Beds Mine Water

Ettringite and monosulfate formation to reduce alkalinity in

Semantic Scholar extracted view of "Ettringite and monosulfate formation to reduce alkalinity in reactions of alumbased water treatment residual with , title={Ettringite and monosulfate formation to reduce alkalinity in reactions of alumbased water treatment residual with steel slag}, author={Enes {\"O}zk{\"o}k and Allen P Davis 2019年3月2日  The alkalinity of SS in this study is 225 (belonging to dicalcium silicate or middle alkalinity slag), which is preferable as a cementitious material The mineralogical phases of SS determined by the Xray diffraction (XRD) analysis are shown in Fig 1 , which were measured by a Cu Xray tube with a step size of 002° and a 2 θ range from 10° to 70°Effect of silicate modulus of water glass on the hydration of alkali 2022年4月1日  Materials and mixing procedure The granulated blast furnace slag was supplied by Ecocem Benelux with a chemical composition determined by Xray fluorescence (XRF) 39 listed in Table 1Solid NaOH Alteration in molecular structure of alkali activated slag with 2019年2月1日  The mechanism behind the alkalinity mitigation effect upon WTR amendment was speculated to be formation of ettringite [Ca 6 Al 2 (SO 4) 3 (OH) 12 26H 2 O; AFt] and monosulfate [Ca 6 Al 2 SO 4 (OH) 12 6H 2 O; AFm] as secondary mineral phases (Özkök et al, 2016) High concentrations of dissolved Ca(II) and OH − created by hydration of steel slag are Ettringite and monosulfate formation to reduce alkalinity in

The hydration of slag, part 1: reaction models for alkaliactivated

2006年11月29日  In the pure slag system (water activated), the C/S ratio in C–S–H was 118 and the A/S ratio was 011 The high alkalinity of pore solution in the AAS paste probably favours the formation of C 4 AH 13 Also anion exchange may take place and actually a solid solution of the AFm phases is formedWhere the alkaline ground water discharges in springs, atmospheric CO2 dissolves into the water and thick layers of calcite form Iron, manganese, and other metals in the metallic portion of the slag have corroded to form more stable lowtemperature oxides and sulfides and have not accumulated in large concentrations in the ground waterGeochemistry of extremely alkaline (pH>12) ground water in slag Ground Water in SlagFill Aquifers by George S Roadcap1,2,WaltonRKelly3,andCraigMBethke2 Abstract Extremely alkaline ground water has been found underneath many shuttered steel mills and slag dumps and has been an impediment to the cleanup and economic redevelopment of these sites because little is known aboutGeochemistry of Extremely Alkaline (pH [ 12) Ground Water in Slag 2014年10月31日  Steel slag, which contains basic oxides capable of generating high levels of alkalinity, may be used in leaching beds or leaching channels to neutralize acid mine drainage (AMD) In the present study, electric arc furnace (EAF) slag from the Pasargad Steel Complex was used to investigate the influence of slag particle size on AMD treatment Three slag An Investigation on the Influence of EAF Slag Particle Size on AMD

Impacts of Steel Mill Slag Leachate on the Water Quality of a

2002年9月1日  The drainage water from the slag mounds is characterised by a mean pH of 119, high concentrations of Ca (up to 700 mg/L), total alkalinity (up to 800 mg/L as CaCO(3)) and are slightly brackish

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