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EXTRACTION OF SULFATE FROM WATER Publication …

forming ettringite and similar crystalline species which are readily removable by settling, filtration and the like. The ... corrosion of piping and hydrocarbon recovery equipment. In the past, bacteriocidal treatments have been proposed to com bat sulfate-reducing bacteria—see Hoover U.S. Pat. No.

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mechanical properties of concrete,the ettringite exists in the concrete materials widely.In the early cement hydration reaction,the ettringite would exist as a single sulfur type of sulp... Chat Now ettringite.

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Alternative technologies for treating mine wastewater ...

The ettringite process utilizes the precipitating clarifier system to precipitate ettringite using lime, an aluminum containing reagent, and a pretreatment agent, if needed. Ettringite sludge is recirculated from the clarifier bottoms to the reactor to help drive the precipitation rate.

(PDF) Effect of Aluminium Sulfate on Cement Properties

The effect of aluminium sulfate on cement properties was studied systematically and the mechanism was analyzed using XRD and SEM tests. Experimental results showed that the addition of aluminium ...

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Sulfate Resistant Concrete | Sika AG

Ettringite cores forming into aged cement pastes. Right picture is a 2 years old paste subjected to sulfate attack. One clearly sees the ettringite cores forming within the C-S-H.

Ettringite Mineral Data

Moore A E, Taylor H F W, Acta Crystallographica, Section B, 26 (1970) p.386-393, Crystal structure of ettringite, Locality: Scawt Hill, Northern Ireland Physical Properties of Ettringite Cleavage:

Experimental Studies on Ettringite-Induced Heaving in ...

Mixing synthesized ettringite with compacted soils did not result in the simulation of ettringite induced heave in the same soils, possibly due to strengthening reactions of the ettringite to the soils and low moisture adsorption capacities of the compacted and hydrated ettringite minerals.

Quantitative X-ray diffraction analysis of ettringite ...

Ettringite can occur as acicular crystals or as a gel-like Vol. 15, No. 3 433 ETTRINGITE, THAUMASITE, XRD, QUANTITATIVE ANALYSIS precipitation and so there is a possibility that both morphologies could coexist in a synthetic ettringite sample.

Ettringite-induced heave in chromite ore processing ...

Ettringite-induced heave in chromite ore processing residue (COPR) upon ferrous sulfate treatment. ... While this transformation may never occur, or the images of the equipment and the ground survey data; occur too slowly for ettringite-induced heave to occur, it is and Dr. Richard Magee for his input in the treatment design nevertheless a ...

An Experimental Study on the SRPC and CSA Cement Systems ...

formation of ettringite depends on several parameters i.e. the ... Mastersizer 2000 laser diffraction equipment. Anhydrite (ANH), plaster (PL) and flue gas desulphurization gypsum ... performed after 1, 3, 7 and 28 curing days and SEM images of the pastes cured for …

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23rd INTERNATIONAL CONFERENCE ON CEMENT …

E. Moulin, S. Sabio, V. Broyer Effect of SP Type on Ettringite Morphology and on the Rheology of Portland Cement Mortars as a Function ... C. Gaytán "In-House" Image Analysis Software: A Comparison Study, For a Fast and ... The techniques and equipment used in the tests were described in Part I, and were used

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The removal of sulphate from mine water by precipitation ...

SEM images of the synthesised ettringite before and after use as a sorbent for arsenate removal were obtained using Zeiss Ultra plus field emission scanning electron microscopy (FESEM) equipment operated at 5 kV at the Centre of Microscopy and Nanotechnology at the University of Oulu.

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Heat evolution in hydrating expansive cement systems ...

The kinetics and mechanism of hydration in various cementitious systems with additives can be investigated by use of calorimetry [1, 2, 3].The heat evolution curve reflects the physical processes and reactions occurring in the hydrating system and leading to the transformation of plastic cement paste into hardened matrix.

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United States Patent (19)

amount of ettringite equal to from about 40% to about 60% of the weight the paste of water, the high alumina. cement, the gypsum source, and the lime source. ... chinery and heavy equipment. In the construction industry, and particularly in the repair of concrete structures such as highways and structural walls and platforms, and the filling of ...

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US9676666B2 - Hardening accelerator containing ettringite ...

The invention concerns a process for the preparation of a calcium silicate hydrate and ettringite containing hardening accelerator composition by reaction of a water-soluble calcium compound, silicate compound, aluminum compound and a sulfate compound, wherein the molar ratio of silicon to sulfate is from 2/1 to 30/1 and the reaction of the four compounds being carried out in the presence of ...

Ettringite - Wikipedia

Ettringite is a hydrous calcium aluminium sulfate mineral with formula: Ca 6 Al 2 (SO 4) 3 (OH) 12 ·26H 2 O. It is a colorless to yellow mineral crystallizing in the trigonal system . The prismatic crystals are typically colorless, turning white on partial dehydration.