Suitability of Zavadov deposit dolomites for use as raw material

Abstract

The Middle Devonian Zavadov deposit of dolomites is located in Ternopol Region. The reserves of categories A--B-E, are 13.2 million tons and of category C2 26.8 million tons [i]. The dolomites are of monolithic, mixed, banded, brecciated, and honeycombed varieties [1,2].Samples of the dolomite were taken by the Pravoberezh Geological Exploration Expedition of Kiev GRP from the northern and northeastern walls of the pit from the trench in the 0-14.5-m range (samples Nos. 1-4) and from the cores of drilled holes (samples Nos. 5-17).The expedition established that the northern wall of the pit is made up of pure dolomites. In the drilled holes together with comparatively pure varieties quite thick layers (up to 8 m) of argillites and argillitelike clays are observed. In external form the dolomite of all of the samples is dense rock, not stratified, and from light-gray to dark-gray in color with bluish or yellowish hues.The chemical analysis of the raw dolomite is 16.98-21.15%* MgO, 0.20-4.77% R203, and 0.50-11.80% SiO2. Samples Nos. I, 5, 8, 9, 12, 15, and 16 type DSM-I, samples Nos. 2-4 and 7 type DSM-2, and sample No. ii type DSM-3 to Industry Standard 14-84--82 for raw metallurgical dolomite. As the result of higher SiO2 content the remaining samples are substandard raw material. *Here and subsequently weight % is given for the chemical composition and volume % for the mineral. 04 I 6,40 I 1,72 21,12 [ 1,90 I 0,49 19,02 I 2,65 I 1,00 18,02 [ 8,32 [ 3,45 18,88 I 1,65 I 1,35 16,94 I 1,88 I 0,77 Fe20a (20@

Effect of iron oxide addition on the hydration resistance and bulk density of doloma

“…1,[16][17][18][19][20][21] Besides, iron oxide addition results in the increase of the density. 16,19,[21][22][23] Sintered dolomite including iron oxide is termed as "dead burnt". 5 Searle and Grimshaw 24 mentioned in their article that in the previous studies of stabilizing dolomite when iron oxide was added it usually formed C 4 AF (brownmillerite) and when the effects of this phase at high temperatures were analyzed, liquid phase increased with the increasing temperature.…”

Sintering and hydration resistance of dolomites from the zavadovsk deposits

“…The calcined dolomite consists [3] of periclase (35-40%), free CaO (35-50%), brown millerite (1-4%) and silicates (5-20%) the ratio of which is determined by the original chemical composition. The presence of dicalcium silicate is noted with the formation of a finely dispersed powder (up to 5%).…”

“…The presence of dicalcium silicate is noted with the formation of a finely dispersed powder (up to 5%). 9 Determined visually %Open porosity and apparent density of granular dolomite are stated in [3] (see Table 5). …”

“…The concentration of basic component equals 88-98%; the impurities consist of calcite, quartz, clay particles, and iron oxides [3].Systematic studies were carried out on the influence of the method of p~eparing these dolomites for firing, the addition of slags, and the firing temperature on the sintering and hydration resistance. Samples of domomites from the Zavadovsk area were provided by the Pravoberezhe geological expedition of the Kiev Geological Commission; batches were taken from the trenches (Nos.…”

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Dolomite from the gavadovsk deposits is a promising material for use in metallurgy [1][2][3]. The concentration of basic component equals 88-98%; the impurities consist of calcite, quartz, clay particles, and iron oxides [3].

Systematic studies were carried out on the influence of the method of p~eparing these dolomites for firing, the addition of slags, and the firing temperature on the sintering and hydration resistance.

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