MENU
It was estimated that nearly 19 million people worldwide were at risk of Hg exposure in 2015 [4], demonstrating that Hg pollution is a global public health challenge. …
WhatsApp: +86 18221755073
Gypsum deposits were formed during the Paleozoic Era, approximately 600 million years ago, when most of the Earth's surface was covered by salt water. Gypsum is composed of 79.1% calcium sulfate …
WhatsApp: +86 18221755073
This study investigated the effects of combined (mixed) application of desulfurization gypsum and biochar on crop growth and soil properties in the saline-alkali soils of coastal mudflats through indoor pot experiments and eight experimental ameliorant treatments. Among them, CK was the control of newly reclaimed cropland in the study …
WhatsApp: +86 18221755073
Red mud (RM), fly ash (FA) and desulfurized gypsum (DG) are harmful solid wastes that need to be treated. In this study, RM, FA, DG were used as the main raw materials to prepare road base materials based on the different (CaO + Na 2 O)/(SiO 2 +Al 2 O 3) molar ratio, and its mechanical properties, durability, microstructure and …
WhatsApp: +86 18221755073
With steel slag and desulfurized gypsum as main raw material,mixed appropriate amount slag and compound addition a little of activator,and based on orthogonal test,we explored the slag dosage,the proportion of the combined admixture activator and the desulfurized gypsum dosage impact on the performance of clinker-free cementing material,such as …
WhatsApp: +86 18221755073
In order to protect national grain safety and ecological safety and develop a sustainable economy,it is important to improve alkaline land with desulfurized gypsum from coal fired power plants.Representative lightly alkalized soil,medium-alkalized soil and seriously alkalized soil in Xidatan of Ningxia Province were selected in the research and used in …
WhatsApp: +86 18221755073
The invention discloses a method for preparing gypsum powder for a ceramic mould in the ceramic industry, wherein the desulfurized product of power plants, i.e., desulfurized gypsum, is mainly used as a main raw material for the gypsum powder for the ceramic mould. The method comprises the steps of: calcining the desulfurized gypsum in a …
WhatsApp: +86 18221755073
DOI: 10.1016/j.jclepro.2020.124777 Corpus ID: 226335113; Preparation, characterization and application of red mud, fly ash and desulfurized gypsum based eco-friendly road base materials
WhatsApp: +86 18221755073
FGD gypsum is a by-product of flue gas desulfurization (FGD) to remove sulfur dioxide emissions from coal-fired power plants. It has various applications in construction, agriculture, and gypsum board manufacturing, but also some drawbacks …
WhatsApp: +86 18221755073
gypsum was divided into deta il, and its comprehensive utili-zation status was analyzed.14) Secondly, some progress has been made in the research of desulfurized gypsum as a waterproofing agent, and a new type of building gypsum-based waterproofing agent has been prepared.15) In addi-tion, a new type of high-efficiency inorganic composite
WhatsApp: +86 18221755073
The effective and safe use of FGD gypsum in agricultural land is still debated in some countries even though its effectiveness in soil management has been reported in many studies. Thus, the changes in the levels of soil salinity, alkalinity, crop yield, and other physicochemical properties in different soil types and crops after …
WhatsApp: +86 18221755073
Integration of flue gas desulfurized gypsum (FGD-gypsum) with cover crops is expected to improve soil quality (SQ). Our objectives were to evaluate the impact of FGD-gypsum and rye on SQ and the ...
WhatsApp: +86 18221755073
The massive deposition of sediment in the Yellow River leads to the waste of land resources and is also prone to environmental disasters. In this study, the industrial by-product, flue gas desulfurization gypsum (FGDG), was incorporated with Portland cement (PC) and fly ash (FA) to treat the dredged soil (DS) from the Yellow River. The …
WhatsApp: +86 18221755073
As we know, coal is the dominant energy in Chinese energy mix. Almost all of the coal-fired power plants are required to equip desulfurization facility to remove SO 2 in the flue gas, as illustrated in Fig. 1.The most popular desulfurization technology is wet-FGD using limestone, with the product called FGD-gypsum, which main content is CaSO 4. ...
WhatsApp: +86 18221755073
Given the great environmental pressure brought by the massive stacking of solid waste, red mud and desulfurized gypsum were used to prepare cementitious materials.
WhatsApp: +86 18221755073
The utilization of desulfurized building gypsum as raw material for gypsum-based self-leveling mortar (GSL) is limited by its low strength and poor water resistance. The objective of this study is to enhance comprehensive properties of GSL and prepare qualified desulfurized building gypsum-based self-leveling mortar that can be …
WhatsApp: +86 18221755073
DOI: 10.1016/j.conbuildmat.2023.131840 Corpus ID: 258997305; Effects of hybrid fibers on properties of desulfurized gypsum-based composite cementitious materials @article{Lv2023EffectsOH, title={Effects of hybrid fibers on properties of desulfurized gypsum-based composite cementitious materials}, author={Fangtao Lv …
WhatsApp: +86 18221755073
In gypsum-rich soils, such as near Lake Mead, Nevada, lichens take center stage. Some crusts feature all components, and in other crusts, multiple components are …
WhatsApp: +86 18221755073
Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers.This article reviews the production in China and the latest beneficial utilizations of FGD gypsum. China is a large coal-consuming country and has always had serious SO 2 emissions. Therefore, the …
WhatsApp: +86 18221755073
Semidry desulfurization and wet desulfurization in a furnace are usually used in the circulating fluidized bed boiler in the power production of thermal power plants, and these two approaches lead to high calcium content in the fly ash and bottom slag of circulating fluidized beds and produce abundant flue-gas desulfurized (FGD) gypsum …
WhatsApp: +86 18221755073
The addition of a retarder lengthened the induction period of desulfurized gypsum and changed the morphology of desulfurized gypsum-hydrated crystal, thus extending the setting time and reducing the strength. Author Information. ... relating to violations of Section 3 or any other breach likely to cause ASTM irreparable harm. If …
WhatsApp: +86 18221755073
1. Introduction. Flue gas desulfurization gypsum (FGDG) is an industrial byproduct produced by limestone-gypsum wet desulfurization to treat SO 2 produced by thermal power plants and coal-fired plants, whose main component is CaSO 4 ·2H 2 O. In wet desulfurization, 1 t of SO 2 produces about 2.7 t of FGDG [1], [2].Some 130 million …
WhatsApp: +86 18221755073
Several people have used coal combustion by-products in mine reclamation (Park et al., 2014, Skousen et al., 2012). The alkaline nature of CCRs neutralizes mine drainage and acidic soil, thereby decreasing metal solubility by precipitating metals as hydroxides. ... (Oriza sativa L.) growth and yield using desulfurized gypsum in the west …
WhatsApp: +86 18221755073
Flue gas desulfurization gypsum (FGDG) is a coal combustion by-product that can be used in various beneficial ways. This review summarizes the recent …
WhatsApp: +86 18221755073
It would be expected that more mercury would be present in coal ash and desulfurized gypsum from the increased combustion of coal and the abundance of Hg removal facilities in Chinese coal-fired power plants, highlighting the increased emphasis on the removal of mercury from atmospheric emissions of coal- Fired power plants in …
WhatsApp: +86 18221755073
Yang et al. studied the effect of desulfurized gypsum on the properties of calcium sulfoaluminate cement. The results showed that FGDG can improve the hydration …
WhatsApp: +86 18221755073
From China's electrical industry statistics, coal ash and desulfurized gypsum yields from coal-fired power plants were approximately 480 million and 5.23 million tons, respectively, in 2010 and the recycling rates of coal ash and desulfurized gypsum were 68 and 67%, respectively. The remaining coal ash and desulfurized gypsum are typically ...
WhatsApp: +86 18221755073
The 11 major electricity-generating coal combustion stations in the northern Great Plains have the potential to produce almost 1 …
WhatsApp: +86 18221755073
XRD, SEM and elemental characterization of FGD gypsum. X-ray diffraction analysis revealed that the characteristic peaks at 2θ value of 11.8, 20.8 and 23.5 (Fig. 2a) of the FGD gypsum 1 suggested ...
WhatsApp: +86 18221755073
6–79.8% of Hg in FGD gypsum could be reemitted at 100–200 °C.. The Hg release ratio is directly related to the HgClx content in FGD gypsum.. Wallboard production and being used as cement retarder were two main Hg re-emission pathways of FGD gypsum utilization.. The secondary Hg emission from FGD gypsum utilization …
WhatsApp: +86 18221755073Copyright © 2024 Sofol Industry & Technology Group Co., Ltd.
المنتجات
محلول
حول الولايات المتحدة
اتصل بنا