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Moreover, it can be seen in the R-3-5 specimen that the XRD intensity of the gypsum peak was most attributed to the desulfurized gypsum, which is the main component of activated sludge [43].

A field plot experiment was conducted to examine the effectiveness of equidistant slotting in combining with gypsum application on the amelioration of soda saline-alkali soil in the west Songnen ...

Mechanical activation technology together with neutralizing additives was suggested for stabilizing phosphogypsum samples' properties and improving their …

The method of field locational experiment was used to conduct the researches of the improving actions of gypsum on soda saline and alkaline soil.The results showed that the application of gypsum increased the standing number of seedlings and the growth of maize.Af-ter the application of gypsum,the soil pH values were significantly …

Abstract: A field plot experiment was conducted to examine the effectiveness of equidistant slotting in combining with gypsum application on the amelioration of soda saline-alkali soil in the west Songnen Plain of Northeast China. Equidistant slotting at the soil depth 20-40 cm and 1 m apart could significantly decrease the degree of soil compaction within the …

Zhao et al. conducted a study in which they blended 5% gypsum with SS powder to investigate the gelation properties of SS. The hydration process of the SS-gypsum mixture exhibited two exothermic peaks, resembling the behavior observed in cement hydration. ... (2020) Activation of blast furnace slag with soda production …

2.1. Materials. Geopolymer backfill pastes are obtained from a chemical geosynthetics process using alkali-activated silica and alumina phase materials [].In this study, the raw materials used to manufacture geopolymer backfill paste are low-calcium fly ash (FFA), soda residue (SR), sodium silicate (NS) pellets and beta-hemihydrate gypsum (BHG) …

1. Combine with an Acid. One of the most common ways to activate baking soda is by mixing it with an acid. This reaction causes it to release carbon dioxide gas, which helps baked goods rise. For every one part baking soda, you may want to mix it with two parts acid to achieve this activation. Common acidifying agents include:

The correct answer is Baking soda. Key Points. The total quantity of water molecules for one salt formula unit is frequently referred to as the water of crystallization. It is also referred to as hydration water. Baking soda, or sodium bicarbonate, has the chemical formula NaHCO 3. Its crystal structure does not contain any water molecules.

The hydraulic and related properties of Portland-slag cement containing granulated blast furnace slag as high as 40% (w/w) has been examined at room temperature under the mixed activation of gypsum and sodium hexametaphosphate. The study confirmed that the minor dosage of polyelectrolyte, hexametaphosphate with 4% …

Volume 288, 21 June 2021, 123111. Activation mechanisms of three types of industrial by-product gypsums on steel slag–granulated blast furnace slag-based binders. Chengwen …

In soda activation, soda ash powder was added to the initially moisturized bentonite samples and kneaded till all the bentonite had reacted with soda. After soda addition and kneading, the activated samples were left to drying/curing under sunlight for a month to complete the activation process (Harvey and Lagaly, 2006).

Download keyboard_arrow_down. Browse Figures. Versions Notes. Abstract. Soda residue (SR), an industrial solid waste, pollutes the environment due to …

The kinetics of dissolution of different lithological varieties of gypsum was experimentally investigated at 5–25°C and P = 0.1 MPa, and a simple rate model was proposed on the basis of the sum of the rates of forward and backward reactions and proportionality to the activity product of calcium and sulfate ions. The activation energies …

Hence, this study introduces a novel environmentally friendly composite, formed by sodium hydroxide (used as an activator), desulfurized gypsum and steel …

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Materials. Procaine, procaine hydrochloride, and 2-napthalene sulfonic acid were purchased from Spectrum Chemicals (New Brunswick, NJ, USA). Phosphoric acid, para-toluenesulfonic acid, ethanesulfonic acid, methanesulfonic acid, oxalic acid, citric acid, formic acid, and sulfuric acid were supplied by Sigma-Aldrich Chemical Co. (St Louis, …

Soda residue (SR), the solid waste of Na2CO3 produced by ammonia soda process, pollutes water and soil, increasing environmental pressure. ... Recently the process of alkali-activation and ...

Xu et al. (2021) investigated the impact of fluor gypsum (FG), desulfurization gypsum (DG) and desulfurization ash (DA) on SS-GBFS binders and activation mechanisms. As shown in Fig. 8, when the Ca 2+ and S O 4 2 − in gypsum were dissolved into the solution, they could react with A l O 4 5 − and generate ettringite.

Preparation and characterization of an alkali-activated cementitious material with blast-furnace slag, soda sludge, and industrial gypsum | Semantic Scholar. DOI: …

Soda residue (SR) is produced from the ammonia-soda process of Na 2 CO 3 and contains large amounts of calcium components, such as CaCO 3, CaSO 4, Ca(OH) 2, and CaCl 2. The emission and storage of them have caused serious environmental problems such as land occupation, soil salinization, and underground water pollution …

Uses vibration to shake material free. Air flows into a disc, which flaps and vibrates. Activation Radius. Effective radius of 4 feet. No specific activation area. Small activation radius. Material Control. Can be used with dry, wet, or sticky materials. Sticky material still builds up, even if bridging is controlled.

The optimal water content and maximum dry density of the soda residue soil with the optimal mix ratio are 63.5% and 0.88 g/cm 3, respectively. After 5 months of natural drying, the soda residue soil filled by liquid soda residue and liquid fly ash has higher strength and better uniformity of hardness.

Alkali-activated cementitious materials have considerable potential, with properties ranging from very high early strength to very high long term strength and low porosity. The role of alkalis in activating industrial by-products such as ground granulated (glassy) blast-furnace slag, ultra-fine silica fume or other by-product silicas, glassy fly …

The two steps included are to 1) produce CaSO4•2H2O (DH) using the discharged soda residues and H2SO4; 2) transform DH into a-gypsum in a mixed solution with additives at 368 K.

To investigate the issues related to significant environmental damage and poor resource utilization of soda residue (SR), the composition and microstructure of hydration products of the GGBS (ground granulated blast-furnace slag) synergistically activated by NaOH-SR are characterized by an X-ray diffraction (XRD), Fourier-transform …

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Uncontrolled gypsum precipitation can also cause hardships during reverse osmosis processes; this issue was also addressed in the literature [9, 41, 42]. Gypsum precipitation as a side-product during the neutralization of some wastewaters was also investigated [3, 43]. From these examples, one may conclude that the precipitation …

Abstract. Disposal of gypsum drywall in landfills has been demonstrated to elevate hydrogen sulfide (H (2)S) concentrations in landfill gas, a problem with respect to odor, worker safety, and deleterious effect on gas-to-energy systems. Since H (2)S production in landfills results from biological activity, the concept of inhibiting H (2)S ...

Approximately 0.093 lb/bbl of soda ash is required to precipitate 100 mg/L of Ca ion. Caution should be exercised to avoid overtreatment. When Ca++ concentration is reduced to 100-150 mg/L, treatment should be suspended. The reaction between gypsum or anhydrite with soda ash is: Ca++ + SO +2 Na+ + CO3= ^ CaCO3 + 2Na+ + SO.

DOI: 10.1016/j.jclepro.2020.122212 Corpus ID: 219427715; Green concrete with ground granulated blast-furnace slag activated by desulfurization gypsum and electric arc furnace reducing slag

production), leading to the activation of alumina and silica oxides. It is important to note that a low calcination temperature will not activate the clay completely and an excessive calcination temperature can cause the recrystallisation of the clay structure. Both cases substantially decrease the reactivity of the clay.