The Hazards Of Fluorogypsum

The proposed fluorogypsum-based blend is durable in water and has a lower weight and lower cost than ordinary concrete. A preliminary investigation of strength and durability properties of this new construction material is also presented. ... This large accumulation of industrial by-products represents a significant environmental hazard ...

Fluorohypsum is a solid, large-tonnage waste generated during the production of hydrofluoric acid. The volume of accumulated waste in the world is hundreds of millions of tons, which makes its utilization an increasingly urgent task. This article presents the results of research aimed at the use of fluorohypsum as a component of building materials. On the basis of the …

Physical modification and chemical activation were used to stimulate the fluorgypsum activity effectively. A compound activator was independently developed to increase its hydration activity, which can accelerate the hydration and hardening of fluorgypsum, so that the strength of the hardened body could be improved. Besides, appropriate water-retaining agent, …

Despite their merits, lime-based materials present a major drawback compared to cement-based ones: they harden very slowly by carbonation, which has implications on their properties that evolve steadily over a long period of time, and is the reason why they present such low strengths at early ages [1, 2, 5].This poses serious difficulties for the development of …

In order to explore the influence of the types of waste gypsum on the properties of alkali slag cement, fluorogypsum (FG) and flue-gas desulfurization (FGD) gypsum were comparatively investigated.

A composition with 62% pH-adjusted fluorogypsum, 35% fly ash, and 3% Portland cement was selected based on strength and volumetric expansion properties to conduct additional experimental studies ...

Fluorogypsum Granulated blast furnace slag Hydration Microstructure Physical properties Water resistance ... and health hazards from the accumulation of by-products. In re-cent years, the use of waste materials in the construction industry has become an important option, as it offers cost reductions, en- ...

The study explores the influence of polycarboxylate admixture (PCE) on fluorogypsum-based self-leveling material (FSLM) performance. Wev conducted an array of tests to assess workability and mechanical properties, and utilized XRD, TG-DSC, SEM, and MIP techniques for microscopic analysis. The fresh state results showed that PCE enables FSLM …

In order to explore the influence of the types of waste gypsum on the properties of alkali slag cement, fluorogypsum (FG) and flue-gas desulfurization (FGD) gypsum were comparatively investigated.

Fluorogypsum is an industrial solid waste produced in the production of hydrofluoric acid. Its main composition is type II CaSO 4 . In order to explore the influence of fluorogypsum (F1, lime content of 3%; F2, lime content of 5%) on the performance of high water filling materials, the influence of fluorogypsum content on the setting time and 1 ...

Phosphogypsum, fly ash, fluorogypsum, produced from the phosphatic fertilizer plants, thermal power plants, hydrofluoric acid industry and lime sludges from sugar, paper and acetylene units, slag from iron and steel, red mud from aluminum based industries, rice husk, bagasse, bamboo, coconut pith and cotton stalk are the paramount industrial agricultural …

Fluorogypsum was dissolved in deionized water at a water-to-fluorogypsum ratio of 2.0, stirred until uniform and let stand at 20 ± 5 °C until the time to be tested. ... J. Korean Soc. Hazard Mitig., 17 (6) (2017), pp. 367-373. CrossRef Google Scholar [23]

The fluorogypsum and Portland cement used were similar to those described previously. A fly ash complying with the quality requirement of Chinese National Standard GB 1596-91 (Table 1) for the second class was used instead of the first class of fly ash used in previous work 8, 9.The chemical compositions of three raw materials are listed in Table 2.

Fluorogypsum Because fluorogypsum is the only sulfate waste that dehydrates to form a solid instead of remaining a slurry or sludge, it has somewhat unique properties or characteristics, …

This study focuses on the effect of Na 2 SO 4 and NaNO 2 on the modification of fluorogypsum, and the performance of the modified fluorogypsum in construction applications …

Fluorogypsum Fluorogypsum is generated at the E.I. DuPont De Nemours & Com­ pany, Inc., HF Plant in LaPorte, Texas. The material is initially pro­ duced in the anhydrite form (CaS04). However, after neutralization with a lime slurry, the fluorogypsum will be converted primarily to the dihydrate form. EXPERIMENTAL INVESTIGATION

In India about 4.0 million tonnes of fluorogypsum, a cardinal waste material of the hydrofluoric acid industry, is produced per annum and poses the problem of disposal and …

A new type of paste filling material was created using fluorogypsum, a byproduct of hydrofluoric acid, as the raw material to address the issue of the filling material's high cost.

Fluorogypsum and KH 2 PO 4 can shorten the setting time and increase the compressive strength of calcium aluminate cement.. Fluorogypsum contributed to AFt formation; KH 2 PO 4 further increased AFt and modified its morphology.. KH 2 PO 4 changed the morphology of AFt to elongated fibers and optimized the pore structure.. Hydration of …

Although gypsum has historically been sourced from mining, it is also produced as a byproduct from some industrial, chemical processes (leading to products such as phosphogypsum, citrogypsum, titanogypsum and …

The content of fluorogypsum is not higher than 40% and the content of fly ash must be more than that of fluorogypsum. Steam curing increases the early strength and enhances the rate of strength increase of the binder. The hydration mechanism of the binder is changed in elevated temperatures. This binder is suitable to manufacture precast ...

Introduction Fluorogypsum (FG), a waste of hydrofluoric acid industry, has been studied for use as building material . Water-resistant binding materials can be produced from phosphogypsum, slag, cement, fly ash and lime sludge. Impurities (fluoride) present in FG may interfere with setting and strength development of plaster/ building components. This paper …

Aspiration hazard Due to the physical form of the product it is not an aspiration hazard. USG Anhydrite Gypsum SDS US 927142 Version #: 02 Revision date: 19-December-2017 Issue date: 26-May-2015 5 / 8. Chronic effects Prolonged and routine inhalation of high levels of respirable crystalline silica particles can lead to

Given the issues related to poor hydration activity, long setting time and low early strength of industrial by-product fluorogypsum (FG), the composite modifiers (Na 2 SO 4 and NaNO 2) were utilized to enhance its reactivity.The investigation of the mechanism involved the utilization of contemporary analytical methods, including X-ray diffraction (XRD), 1 H low-field …

Fluorogypsum (FG), a by-product obtained during the production of hydrofluoric acid, satisfies these conditions, as it is capable of binding granular materials. Approximately 894,000 metric tons ...

RESEARCH ARTICLE Study on the proportion of paste filling materials based on fluorogypsum Wang Chun1,2,3, Li Xin-ru2, Cheng Lu-ping ID 2*, Xiong Zu-qiang2, Zhan Shuai-fei2 1 Sinosteel MaAnShan General Institute of Mining Research Co., LTD, Maanshan Anhui, China, 2 School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo …

The modified fluorgypsum as cement retarder could delay the hydration, reduce the heat of the hydration and make the setting time, volume stability, and the SO3 content of the …

Fluorogypsum (FG), a by-product obtained during the production of hydrofluoric acid, satisfies these conditions, as it is capable of binding granular materials. Approximately 894,000 metric tons ...

Physical modification and chemical modification were used to modify fluorgypsum. Effect of physical modification and chemical modification on the performance of fluorgypsum was studied, and the mechanism of modification was discussed by testing the phase composition and microstructure of modified fluorgypsum, using XRD and SEM. The results showed that …