— Quenching is often an essential step in heat treatment of steels for enhancing strength. Water quenching which is low cost and free of pollution risk instead …

quenching and water-cooling to deal with steel slag and realized industrial production [13], through which the uti-lization rate of steel slag has been improved significantly. In addition, due to the advantages of high sphericity and good stability, air-quenched steel slag has been applied to abrasive [14] and concrete fine aggregate [15 ...

 — In essence, gas quenching slag granulation process is a gas-liquid flow atomization process which includes primary breakup and secondary breakup [31].In the primary breakup, the growth of Kelvin Helmholtz (KH) unstable wave at the gas-liquid interface causes the film to break up into ligaments [32].The size of ligaments is related …

 — For example, the purpose of quenching A356 Al castings is to keep the Mg2Si from forming precipitates. If done correctly, this yields maximum strength and good elongation in castings. Quenching of steel …

Tradition steel slag water quenching method is because residual steel did not carry out effective separation before shrend with liquid steel slag, residual steel withWater contact is easily blasted, and has formed larger potential safety hazard to user, has affected the normal production of steel-making,User's economic benefit and social benefit are reduced.

The water-quenching process generated a mass of activated compositions and enhanced the stiffness of the slag. In particular, some vitreous grains were formed in this process. The chemical compositions and density of the WQS are given in Table 4.27. ... Steel slag aggregates can be acidic or basic and can leach hazardous elements ...

 — Water quenching is a traditional heat recovery technology, which uses cold water to cool down slag so as to achieve the desired glassy by-products. However, this technology consumes a huge amount of water and fails to recover the sensible heat of slag. To save energy and reduce water consumption, some other heat recovery technologies …

 — During water quenching process, high-pressure water is employed to shatter the molten slag. However, the water quenching methods not only fail to recover the high-temperature waste heat but also consume a huge amount of fresh water by the evaporation of 1000–1500 l of water per ton of slag [13].

 — Slag water-quenching processes are rapid to complete, and some of the unreleased heat energy of these processes is converted into chemical energy and stored as chemical bonds in the slag. ... Mo et al. prepared a steel slag slurry by mixing steel slag with water (with a water–slag ratio of 0.40). After curing the slurry for 14 days at a ...

 — For the blast furnace, converter and electric furnace slag sensible heat, only water quenching method recovering hot water has been applied while the others are still in the experimental research stage [7]. Using the flashing water sensible heat to heat the residents in winter is the main utilization way in China.

The steel industry is one of the most energy-intensive industries in China. Based on statistics of World Steel Association, China's crude steel output reaches 823 ... However, there are many defects of water-quenching slag method, which can be roughly concluded as follow: a mass of sensible heat unrecovered, high water consumption, air ...

 — Steel slag, the main solid waste in the steel-making process, is produced more than 120 million tons annually in China.Most of the steel slag was stored in the open air, which brought potential safety and environmental protection risks such as land occupation and infiltration of heavy metal components into the soil. In recent years, the …

 — The cooling measures (such as, air-cooled, water and air quenching, and steam quenching) impact the crystallization process of minerals in iron slag. The rapid cooling process (e.g., water ...

A water-quenching process is necessary for the formation of WQS particles, to enable cooling down, liquified blast furnace slag at more than 1400°C was dumped into a river. …

 — In stainless steel production, slag from argon oxygen decarburization (AOD) converters is dumped on to the ground and then slowly cooled. ... (reference sample obtained from water quenching of slag from the ladle). For several tests, Sample A (granulated slag) was collected as three fractions based on its locational distance from …

 — The relation between cooling method and the phases and stability of steel slag were carried out in the present study. The slags were first melted into liquid state at …

 — how water quenching of steel slag results in products with. a high content of glassy material. Silicate melts have high. viscosity due to long molecule chains, and rearrangement.

 — The molten steelmaking slag before air quenching was sampled for natural cooling in the air. Then, the molten steelmaking slag was treated by air-quenching granulation technology. The process schematic is shown in Fig. 1. The molten steelmaking slag was poured into the slag pot at an appropriate speed and flowed through the …

 — Water-quenching blast furnace slag as a by-product of the iron production has caused serious environmental concerns. This paper tried to investigate the feasibility of the blast furnace slag ...

 — Slag water-quenching processes are rapid to complete, and some of the unreleased heat energy of these processes is converted into chemical energy and …

cracking, or soft spots. Water quenched steel parts may rust unless immediately treated with a rust preventive. TEMPERATURE The temperature at which water boils (and the maximum cooling ... In most cases, water quenching is accomplished at room tempera-ture (15-25°C). If the water is not well agitated, then highly variable

 — There are various methods for cooling molten EAF steel slag: air-cooling, air-quenching, water-spray, water-quenching and shallow box chilling [28, 29]. Around 100–160 K g of EAF slag is formed per ton of produced molten steel. For the last five years, the produced molten steel in Egypt exceeds fourteen million tons.

 — The conductive pavement brick can be used for deicing, especially for urban regions with heavy snowfall. This work aims at developing a new pavement brick, which was prepared by steel slag quenching with wind mixed with carbon fiber, and the electrothermal law of the samples was studied by using low-voltage direct current (DC) …

Steel slag mainly refers to the blast furnace slag and converter slag produced in the process of iron making and steel making, and with the increase of steel pro- ... water quenching slag, and the heat recovery rate is high, but the equipment required for production is large,thestructureiscomplex,andtheparticlediameter

 — The content of f-CaO in samples was reduced from 14.75 mass% of furnace cooling slag to 2.64 mass% of water quenching slag. According to the empirical formula Eq. (6), the autoclaved chalked ratios of steel slag under furnace cooling, air cooling, mist cooling, and water quenching were 24.98%, 19.97%, 11.23%, and 5.84%, respectively. …

 — However, the cracking of alloy steel parts is easily caused by water quenching and has not been solved for a long time. Therefore, oil quenching and polymer aqueous solution are still widely used in heat …

 — The needle-shaped martensite structure can be seen. The steel C45 was quenched in water after one hour of austenitisation at 820 °C. Figure: Micrograph of a hardened steel (C45) ... While unalloyed steels usually have to be quenched in water, a milder quenching medium such as oil is sufficient for low-alloy steels. On high-alloy …

 — GBF slag is a non-crystalline granular material that varies from the source to source depending on the quality of the raw material smelted as well as the method of production. The liquid slag is cooled and solidified by rapid water quenching to form a glassy state material with minimum probability of crystallisation.

 — Highlights. •. Three water-quenching systems are proposed to recover waste heat from molten slag. •. The subcooled-water-quenching system can increase the …

 — Studies have shown that rapid cooling of steelmaking slag can effectively reduce its f-CaO content.Li et al. [19] reported that the f-CaO content in the steelmaking slag treated by furnace cooling, air cooling, mist cooling and water quenching was 14.75%, 11.58%, 6.05%, and 2.64%, respectively.The details of CaO content will be discussed in …