LU83658A1 - PROCESS FOR USING A MIXTURE OF CALCIUM SULPHITE HALF HYDRATE AND CALCIUM SULFATE DI HYDRATE IN THE MANUFACTURE OF CEMENT - Google Patents

Description

ί 1 i ί the present invention relates to the use, in the manufacture of cement, of a mixture of half hydrate of calcium sulfite and of sodium sulfate dihydrate, calcium obtained in proportion from 1 to 99 ^ (and preferably from 1 to 30 of calcium sulfite half hydrate and from 1 to 99 ^ (and preferably from 60 to 99 of calcium sulfate dihydrate, in a process J for the desulphurization of smoke gases in which the smoking gas, produced by the combustion of fossil fuels ··, is treated, with a suspension containing wedge: · um, in a washing machine where will form, inter alia, calcium sulfite half hydrate which per; · partially oxidized by addition of oxygen from the air to give cal-15 cium sulfate dihydrate, vr partial flow of the suspension thus formed, content · T, inter alia, had calcium sulphate di-hydrate, being withdrawn from the circuit of the washing machine i; and to thickeners where it will be considerable-

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dehydrated, solid matter, moisture resis-

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! w reduced dual, then being extracted from the circuit and the liquid material preferably being brought back to! ' # the washing machine.

"In the manufacture of cement, gypsum is added to the solidifying agent. Up to this point: 25 ° C., with the addition product being mixed, nar groy-: s.ge, & ·. Clinker of cement under form of natural coating or natural coating.

t "years Ir processing these gases this smoke produced tar the ccm.Dus" - on fossil fuels gold. ccü due 30,,.

s or aur; -ssem.ent treecriptions relating to tolt1 lut i or. In the air, take these steps to lower the sulfur content of these smoke gases. the desul-% furatxon smoke gases can be carried out, in known manner, in the context of wet desulfurization these smoke gases. Depending on the progress of the process, by the wet desulfurization of the smoke gases, a mixture of calcium sulphite half hydrate and calcium sulphate dihydrate is obtained, the content of half - calcium sulfite hydrate which can be adjusted to parts by weight determined relative to the total solids content.

1 0 for the manufacture of poor construction, one can only use products whose content of half-hydrate this calcium sulfite is significantly less than 1 λ · To obtain such a product from a desulfurization because wet smoke gas it's

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essential to use a particular process using a device in accordance with complicated »We do not always cr-rche & get desulfurization by wet vote these smoke gases a product with a high content 2q sulphate rais a product suitable for others uses.

As has been shown, half-hydrate of calcium sulphide can replace that of -u -.- 'rato', the half-hydrate, or the sulphate anhydrite calcium in the solidification regulator functions in cement manufacturing.

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J-'5 · Present invention & therefore object of using, solidification regulator coat in the manufacture ^ cement, a mixture of half sulphite of c & ciunun and di-hydrate of calcium sulphate instead, /) , natural or that natural anhyirite ”used: 'j-eau' here.

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To achieve this goal, the present invention proposes to use a mixture of calcium sulfite half hydrate and calcium sulfate di hydrate in composition from 1 to 99% (and preferably from 1 to 30%). of calcium sulfite half hydrate, and from 1 to 99 μl (and preferably from 60 to 99 μl) of dihydrate. calcium sulfate.

the advantage provided by the invention lies in the possibility of using, under economically favorable conditions, for the production of cement, a product formed during the wet desulfurization these smoke gases. the cost of wet desulphurization of the film gases is appreciably increased by the fact that the progress of the 1 S process

wet desulfurization these smoke gases can be focused on obtaining a mixture of calcium sulphite half hydrate and calcium sulphate di-hydrate as well as by simplifying the apparatus. the use of such a product as an acid-20 product. ,, „,.

* i-mon \ reguxateur ce εοΧίqnic & tionj cars the manufacture of cement * * cement does not lead to the formation of a damaging pollutant the environment, because one must xout ra ^ ticu- ^ * '; ~ 'very underline 0ue harmful salts r.our envi-; ^ simply remain partly in the mixture of half I b. ,: r-Pcrate of calcium sulphite and calcium sulphate di-hydrate, while with other methods i - Os S £ is cr. ct "γθ evacuated, six xar the evacuation water, either by the formation of deposits - In addition, 11 use that this inevitable waste decreases the exhaustion -" - rt des giser.er.ts this raw natural gypsum .

Claims (1)

4 i # CLAIMING Use, in the manufacture of cement, of a mixture of - half-hydrate of calcium sulfite and di-hydrate of. - calcium sulphate obtained, in proportion from 1 to 99 ^ Λ (and preferably from 1 to 30 ¢) of half-hydrate of sul-i 5 calcium fite and from 1 to 99 λ (and preferably from 60 to 99 / °) of calcium sulphate di-hydrate, in a process this film gas desulphurization in which the smoke gas, produced by the combustion of fossil fuels, is treated, with a suspension containing calcium, in a washing apparatus where will form, among other things, calcium sulphite half hydrate which will be partially oxidized by adding oxygen from the air to give sulphate di-hydrate this calcium, a partial stream of the suspension J thus formed, containing , inter alia, of calcium sulphate hydrate, being withdrawn from the circuit of the washing apparatus and brought to thickeners where it will be considerably dehydrated, the solid matter, of reduced residual humidity, then being extracted from the circuit. and the liquid material preferably being returned to the washing apparatus c ft "