Sintering of stock mixtures based on gypsum-containing wastes

Sycheva, L. I.

doi:10.1007/bf00683595

Cited by 2 publications

(7 citation statements)

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“…Basic parameters (temperature, time, presence of oxidation agents, etc.) of gypsum calcination technology [1,2] meet the basic parameters of the hydrophobic modification process [7]. Experiments on calcination of gypsum dihydrate with peat hydrophobizers at T = 180-200°C completely confirm this assumption.…”

Section: Resultsmentioning

confidence: 86%

“…However, it should be kept in mind that high strength properties can be achieved only by optimization of particles size, concentration of the hydrophobically modifying component and suppressing air entrapment [1]. In this case, there will be achieved a high hydrophobicity of the material that will not lower its strength.…”

Section: Resultsmentioning

confidence: 99%

“…The main differences of the obtained anhydrites from hemihydrate are in their higher water demand, quick setting and reduced strength [1]. A further thermal treatment in the range of 360 to 800°C on the above modifications of calcium sulphate results in complete rearrangement of the crystal lattice and, consequently, their conversion into insoluble anhydrite.…”

Section: Methods Usedmentioning

confidence: 99%

“…α-calcium sulphate hemihydrate, in its turn, is formed by thermal exposure (T = 97-115°C) to gypsum dihydrate in an aqueous medium, saturated steam, and in a number of salt solutions [1] in accordance with the mechanism (1). That is, it is necessary to create an environment in which liquid droplet moisture will be released from gypsum dihydrate.…”

Section: Methods Usedmentioning

confidence: 99%

“…Gypsum dihydrate refers to quick-setting and quick-hardening miner binding materials. It is widely used for plastering, manufacturing of gypsum concrete, gypsum building products, castings, forms, and as an additive to other binding materials [1].…”

Section: Introductionmentioning

confidence: 99%

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Use of Deep Peat-Processing Products for Hydrophobic Modification of Gypsum Binder

Misnikov

Ivanov

2017

E3S Web Conf.

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Abstract. The article deals with the issue of gypsum binder quality reduction during its storage and transportation. The study provides the main methods to protect gypsum from unauthorized exposure to moisture and water vapor. The author proposes hydrophobic modification as a perspective method for the preservation of gypsum activity and its water absorption reduction. The substantiation of cement hydrophobization with the bitumen released during peat thermolysis is provided. The author proposes to use this method in the technology of gypsum binder production. The basic idea is to combine the hydrophobization process with the calcination of calcium sulfate dehydrate. This is facilitated by temperature ranges used for dehydration of natural gypsum and the initial stage of thermal decomposition of the organic matter of peat. The author defined experimentally an optimal concentration of the organic component in gypsum binder. After adding 0.5-1% of the peat additive, the gypsum plaster preserved its grade strength and increased its storage time without caking and hydration, also under adverse conditions. The proposed method is adapted to the technological processes presently used in the production and doesn't require changing any equipment. The price of mineral raw materials and semi-finished products of peat are approximately equal which reduces the probability of increasing of the cost of hydrophobically modified gypsum binder.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Methods Usedmentioning

confidence: 99%

Section: Methods Usedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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