— Wang et al. investigated the effects of substituting carbonated steel slag powder for cement and steel slag powder in concrete at mass ratios of 5%, 15%, 25%, and 10% and 20% of total cementitious materials on the working performance and mechanical properties of concrete. After carbonation pretreatment, the contents of f-MgO and f-CaO …
To improve the diversity of solutions, a CT-NSGAII algorithm is proposed by introducing the clustering-based truncation mechanism into solution selection process.
— For example, industrial solid waste catalysts or catalyst carriers can increase the yield of bio-oil, effectively improve the quality of bio-oil by increasing its calorific value and reducing its ...
— Wet grinding of calcified slag was conducted to improve alumina extraction from red mud by the calcification–carbonization method. The grinding operation conditions and mechanism were investigated.
— With the development of the solid waste slag industry, the special dry vertical mill for the equipment of the slag micro powder industry is a new type of powder mill to increase production and reduce consumption. It has high grinding efficiency, fast powder separation efficiency and fine classification accuracy. It is favored by the industry and is …
— This article uses steel slag powder and recycled concrete aggregates to prepare controlled low-strength materials (CLSM). The study investigates the influence …
— Keeping the material layer thickness in a suitable range can not only improve the quality of powder, but also save electrical power. Previous studies on the material layer thickness did...
— Zhong et al. found that the compressive strength of a dry mixed block made from steel slag powder (with a water–slag ratio of 0.12) was significantly enhanced to 69.9 MPa under a CO 2 pressure of 0.55 MPa and a temperature of 70 °C for 360 min, while the compressive strengths of steel slag blocks produced without carbonization …
— Slag is the solid waste generated during the smelting process, and the methods for treating slag mainly include: 1. Slag grinding: Grinding slag into powder, used in the building materials industry. The slag grinding equipment provided by Xinhai Mining Equipment can efficiently grind slag to the required particle size, meeting market …
— The utilization of metal slag as a fill material can help land reclamation operations in several ways. The alkaline qualities and fine particles of the soil help to improve soil quality, increasing fertility and promoting plantation. In steep or uneven terrains, it can also aid in stabilizing and preventing erosion.
— In China, slag crushed stone can replace natural stone for highway, airport, foundation engineering, railway ballast, concrete aggregate and asphalt pavement.It can be used for: preparing slag …
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— Results demonstrated reduced vibration and energy use versus manual control. Validation confirmed improved accuracy in predicting mill responses. Significant …
GGBFS is mainly used is slag cement manufacture by grinding with Portland cement clinker (Neville, 2012). In 2002, granulated slag accounted for approximately 70% of the total blast furnace slag production in the world; the proportion of cement containing GGBFS is as high as 80% in some countries (Geiseler & Vaittinen, 2002). 5.3.3 Expanding
— Using CT-NSGAII and GRNN models, optimal Pareto front of slag powder MOP (multi-objective optimal problem) are obtained. Further more, combining real production demand, optimal solution is determined from the Pareto front to guide the …
— 300 mesh putty powder HD1280 raymond mill grinding case Apr 18, 2019
— Although refining the particle size of steel slag can improve its reactivity, the high content of RO-phase results in poor grindability and large grinding energy consumption [24], [25]. Instead of being directly used as SCMs, steel slag is endowed with a good capacity to sequestrate CO 2 due to its Ca-rich nature.
pollution of air and land. The slag can form powder after grinding. When the specific surface area of slag powder is more than 400m2/kg, the strength of the cement is obvi-ously enhanced [1]. So how to ensure the quality and yield of slag powder has been an important issue. Slag powder is a multivariate, strongly coupled and nonlinear process.
— Portland cement is the most common type of cement in the world. It is used primarily to make concrete, mortar, and grout. Portland cement manufacturing begins with mining and then grinding raw materials that include limestone and clay, to a fine powder, called raw meal, which is then heated to a sintering temperature as high as 1450 °C in a …
— Wet grinding of calcified slag was conducted to improve alumina extraction from red mud by the calcification–carbonization method. The grinding operation conditions and mechanism were investigated. The results showed that wet grinding destroyed the compact structure of spherical hydrogarnet and broke down agglomerates. The rough …
— The use of electric furnace ferronickel slag (FNS) as a supplementary cementitious material is the current focus of research. This study investigates the effect of mechanical grinding and chemical additives on the activity excition of FNS, as well as the associated synergistic mechanisms. This study shows that the addition of …
— Removing slag requires skill and attention to detail; chipping with a hammer and chisel can be effective but requires patience. Grinding with a grinder must be done carefully not to damage the weld itself. Using a wire brush is useful for removing residual slag that remains after chipping or grinding.
— This detached powder cushions the natural rock and reduces the efficiency of subsequent grinding. The effect of the natural aggregate hardness in the parent concrete on the cement paste content can be seen as analogous to the other RCA fractions ( C. Zega et al., 2010 ; C.J. Zega et al., 2010 ).
Clinker is often replaced with supplementary cementitious materials (SCM) such as granulated blast furnace slag, natural pozzolanes and fly ash in order to reduce CO 2 emissions and material cost. However, SCM may counteract strength development, powder flowability, mortar workability and durability, which are critical for cement quality.
main criteria of granulated slag quality evaluation are the actual content of glassy amorphous phase, which must be at least 66.6% and a specific surface area 3750–4500 cm2/g, obtainable after milling. To achieve this indicator, the granulated slag is sub-jected to mechanical milling, predominantly up to a fraction of 0–75 μm. Studies [16,
Some of the most common flux-cored wires with rutile slag systems include those classified under AWS A5.20: Specification for Carbon Steel Electrodes for Flux-Cored Arc Welding and feature designators of T-1, T-9 and T-12. T-1 flux-cored wires provide good wetting action and are generally reserved for less critical applications since they don't offer the …
of slag powder can only be changed by changing the fineness of slag powder. The fineness of slag powder is usually expressed by a specific surface area and particle size distribution. Di erent levels of fineness can be achieved by grinding di erent materials with di erent grinding methods and di erent grinding times [18–21].
— Solutions to reduce the volumetric instability of the slag aggregates and improve the environmental quality of the fine grained powder slags are therefore necessary. The challenge is here to convert …
