An alternative to the FB-Line scrap recovery dissolver was desired for the dissolution of sand, slag, and crucible (SS{ampersand}C) residues from the plutonium reduction process due to the potential generation of hydrogen gas concentrations above the lower flammability limit. ... Strontium and rare earths are extracted by a solvent …

An experimental analysis of cement mortar's microstructure, mechanical, and durability properties is investigated by replacing sand with 0, 25, 50, 75, and …

Sustainability leads a cementless materials branch in material engineering and science. Geopolymer is one part/leaf of the sustainability branch and has many advantages (i.e., less carbon emission and low energy consumption in production) attracting attention itself. The recent dizzying progress observed in geopolymers has now turned its …

assessed by partially replacing sand with iron slag. The sand has been replaced by slag accordingly in the range of 0% (as a control mix) 10%, 20%, 30%, 40%, 50% and 60% by weight of sand for M20 mix. Concrete mixtures were produced, tested and compared in terms of compressive and split tensile strength with the conventional concrete.

Download Citation | Source apportionment and health risk assessment of chemicals of concern in soil, water and sediment at a large strontium slag pile area | Strontium (Sr) is an alkaline earth ...

Section snippets Study area and field sampling. The study area was a site of a closed SrCO 3 production plant (now a Sr slag pile area) and its surrounding area in Chongqing, China. The closed plant formerly adopted the black ash method to produce SrCO 3, using SrSO 4 as raw material. Firstly, SrSO 4 was roasted with coke at about …

Chemical activator 28d strength of strontium slag sand. From "Figure 3", it can be seen that the compressive and flexural strength of 28d is the best, adding CaCl2 can reach …

As part of our effort to preserve the environment, the incorporation of ground granulated blast-furnace slag (GGBFS) or fully replaced by alkali-activated slag (AAS) …

Magnesia castables were prepared using strontium carbonate (SrCO 3) as additive to enhance slag resistance and mechanical properties, and the influence of …

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Clinkers from slag-based raw mixes are different in terms of the number of alite growths. The strength of cements was defined in small samples from cement paste (1:0) with water-cement ratio of 0.28. The results given in Table 3 show that the use of slags in raw materials instead of clay positively affects the activity of clinkers.

The geopolymer binder adopted was a mix of metakaolin (MK) and granulated blast furnace slag (GBFS), activated by an alkaline solution (SiO 2 /Na 2 O=1.8) with a water to solid ratio of 0.5. A control GC (0% RA) with C35/45 class of compressive strength and S4 class of workability, and three GC mixtures with 10, 30 and 50% of RA were ...

Strontium slag, a by-product of the strontium carbonate refining industry, has been produced at million tons per year in China. The use of strontium slag in the roads could reduce the demand of materials and help …

Slag, 80% – 95% TiO. 2, average unit value of imports. 6. 738 792 757 7 74 830 ... completed at a heavy-mineral-sands project near Camden, TN. The project plans also included production of synthetic rutile from ilmenite using a proprietary process. In 2022, China continued to be the leading producer and consumer of titanium mineral ...

Strontium (Sr) is an alkaline earth metal that has adverse effects on bone tissue, but received little attention compared to other often-studied metals. This study analyzed the contents/concentrations of Sr, barium (Ba), sulfate (SO 4 2- ), sulfide (S 2- ), and six common metals in 209 multi-media samples, including slag, soil, groundwater ...

The accumulation of strontium slag occupies land and pollutes the environment. According to incomplete statistics, at present, the total amount of strontium slag abandoned in the slag field has ...

Strontium is a naturally occurring alkaline earth metal that is common in marine systems and crustal materials (Kasimtseva 2010). Its radioactive form (90 Sr) is highly toxic and may pose a great risk to the population. Microbially induced calcite precipitation (MICP) was evaluated for its potential to remediate strontium from aquifer …

1. Introduction. Strontium (Sr) is an alkaline earth metal, an analogue of calcium (Ca) and barium (Ba). In nature, Sr is found as minerals of celestite (SrSO 4) and strontianite (SrCO 3).SrCO 3 can also be prepared synthetically from SrSO 4 by direct conversion or black ash method (Zoraga and Kahruman, 2014).SrCO 3 is often applied in …

The compressive strength and flexural strength increased by 33% and 9.8%, respectively, and the elastic modulus increased by 22%. Hisham Qasrawi et al. [ …

@article{Ding2021SourceAA, title={Source apportionment and health risk assessment of chemicals of concern in soil, water and sediment at a large strontium slag pile area.}, author={Da Ding and Lingya Kong and Dengdeng Jiang and Jing Wei and Shaohua Cao and Xuwei Li and Liping Zheng and Shaopo Deng}, journal={Journal of …

The mix ratio of cement and strontium slag mortar mixed with different chemical activators is shown in Table 2. Standard sample P.O is used as reference comparison. Table 2. Mixing ratio of chemical additive strontium slag cement sand. Test number admixture /g Standard sand /g cement /g water /ml strontium slag /g P.O - …

The objective of this investigation is to assess the feasibility of substituting commercial-grade silica sand (CGSS) with granulated blast furnace slag (GBFS) for green mold casting process. Central composite design of response surface methodology (RSM) is used to optimize mold constituents of the GBFS mold. The RSM model predicted the …

Slag, as shown in Fig. 1, is the 16th ingredient of high-performance concrete production [22], called supplementary cementitious materials (SCM) [23], that can enhance the strength and durability of concrete [2].The highly fine slag powder, with a surface area of 400–600 m 2 /kg and a bulk density of 1200 kg/m 3, can be mixed with free lime to …

Strontium slag is a by-product mainly discharged form the utilization of celestine (the main chemical component is SrSO 4) for the production of SrCO 3.At present, the annual production of strontium slag in China is estimated to be 5 million tons [].Furthermore, the production of strontium slag is increasing year-by-year.

Belite-calcium sulfoaluminate (Belite-C 4 A 3 $) cement is one type of low-calcium clinker with good long-term compressive strength and durability. Yet, its early mechanical property is lower than P·І 42.5. In this paper, the effect of strontium slag on the preparation and performance of belite-C 4 A 3 $ cement was investigated. Moreover, the …

The alloys were also modified with strontium (∼250 ppm) to study the combined modification effect of Sr and mischmetal at both high and low cooling rates corresponding to dendrite arm spacings ...

Download scientific diagram | Chemical activator 7d strength of strontium slag sand. from publication: Analysis of Active Mechanism of Chemical Activated Strontium Slag | …

The addition of slag in metakaolin-based geopolymers is a promising approach to improve their mechanical properties. Thus, this study investigated the effect of slag content on the strength and shrinkage properties of metakaolin-based geopolymers. Increasing the slag content and Na 2 O content was beneficial to the reaction of alkali …

Silica Sand 6 - 7 Olivine 6.5 Pyrite 6.5 Titanium Dioxide, Rutile 6.5 Zirconium Silicate (Zircon) 6.5 - 7.5 Copper Slag 7 Cuttlebone 7 Furnace Slag 7 Glass (Lead Free) 7 Quartz (Silica Sand) 7 Specular Hematite 7 - 7.5 Staurolite 7 - 7.5 Garnet 7 - 8 Emery 7 - 9 Spinel ~8 YAG 8¼ Steel Shot/Grit 8 Zirconia 8 Chrysoberyl 8.5 Aluminum Oxide/Alundum 9

An inadvertent leakage of 90 Sr into the environment can induce an easy accumulation in biosphere and cause a continuous radiation to the surrounding ecosystem. In this study, sodium hexametaphosphate (Na 6 O 18 P 6) was employed to modify the blast furnace slags (BFS) to enhance the chemical stabilization of Sr 2+ ions in the BFS-based …

Li et al. [36] investigated the strontium retention of surface modified quartz sands through column migration tests, and a distribution factor of 2.48 mL/g was obtained for solution ionic strength ...

Three methods have been widely employed to improve the reactivity of steel slag and concurrently reduce its potential harm on cement-based host materials: (i) physical excitation, which stimulates the hydration activity by physically grinding steel slag into finer powder (Liu et al., 2016), (ii) chemical excitation, which adds chemical admixtures, such …

Download scientific diagram | Mixing ratio of chemical additive strontium slag cement sand. from publication: Analysis of Active Mechanism of Chemical Activated Strontium Slag | Strontium and Slag ...

Steel slag is a by-product discharged from the steelmaking process, which is characterized by abundant free calcium/magnesium oxide, low …

The feasibility of converting high-iron electric furnace ferronickel slag (EFFS) and high-calcium blast furnace ferronickel slag (BFFS) to refractory materials was assessed by sintering with the addition of low-cost sintered magnesia.The preparation and properties of the refractory materials were investigated and compared based on both …

This study used the SBS bonded with limestone sand acquired from the Zhongtieshanqiao Group (Qinhuangdao City, Hebei Province, China). Sodium metasilicate was used as a chemical binder, which was subjected to CO 2-hardening process by passing carbon dioxide gas through the compacted sand.The modulus of sodium silicate was …

Blast furnace slag (BFS) produced from smelting iron procedure has become one of hot-spot materials for the preparations of geopolymer and cementitious materials. ... Strontium nitrate (Sr(NO 3) 2, Analytical grade) used for the preparation of stock solution was purchased from Shandong XIYA reagent factory, China. The stock solution …