Interaction in Sodium Sulfate – Carbon Mixtures as a Function of Their Dispersity

Abstract

Mixtures in the system Na 2 SO 4 + C + SiO 2 after heat-treatment at different temperatures are investigated. A characteristic feature of the interaction at 900°C is flotation of quartz grains together with the formation of a dense silica-containing surface layer. Separation of the mixture with flotation of incompletely fused material is characteristic for commercial technology with reducer deficiency. The reactivity of sulfates and carbons is observed to depend explicitly on their dispersity. A combination of coarse sulfate and finely dispersed carbon is best.

Influence of Fining Agents on Glass Melting: A Review, Part 1

“…The interaction of sodium sulphate with carbon as a function of particles dispersity was studied by Minko [17]. The study considered three different combinations of the system Na 2 SO 4 +C+SiO 2 with various dispersity of sulphate and coal particles.…”

“…This reduction is mostly performed by a reaction of the s-g type. Overall, 16.9 g of carbon is required to reduce 100 g of sulphate [17]. The reaction of the carbon in the batch may be described in first step via the set of equations listed below (15 and 16):…”

“…• additions of sodium sulphate prevent the agglomeration of batch particles, particularly sand particles, and consequently, the slowing down their dissolution in the melt [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17],…”

“…• sodium sulphate and other fining agents react with other batch components during the initial stages of glass melting and produce new chemical compounds, including gases, depending on the glass batch composition, oxidation-reduction state of the melt and atmosphere above the melt [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35],…”