Deflocculants for refractory castables (review)

  • S. V. Chaplianko STATE ENTERPRISE “STATE INSTITUTE FOR DESIGNING ENTERPRISES OF COKE OVEN AND BY-PRODUCT PLANTS”, Kharkov, Ukraine
  • V. V. Nikichanov Kharkiv National University of Civil Engineering and Architecture”, Kharkov, Ukraine
Keywords: deflocculant, bauxite, silica fume, corundum, spinel, alumina, cement, flow, properties indicators.

Abstract

Review and analysis of foreign studies aimed at researching the influence of various deflocculants on properties of refractоry castables have been executed. Technological efficiency of deflocculants application had been shown:– ADS/W brands comparison to polyacrylate and sodium threepolyphosphate in alumina-cement-based mixture in terms mass`s humidity reduction of 17 % and 22 % to obtain the required vibration flow (200 mm) and samples` compressive strength increase of 29 % and 56 %;

– M-ADS/W brands comparison to ammonium polymethacrylate and sodium hexametaphosphate in low-cement high-alumina castable in terms mass`s vibration flow increase of 5 and 14 %, samples’ compressive strength increase of 23 and 14 % for heat-treated at 110 °C and of 44 and 53 % for fired at 1500 °C;

– brand REFPAC MIPORE 20 comparison to Peramin AL200 in low-cement corundum-spinel castable in terms of mass`s vibration flow increase of 5 %, gas permeability increase in 15 times with samples` compressive strength decrease of 30 % and differences in water evaporation temperature, with samples’ size increasing, reduce to 3 °С (against 78 °С); in comparison with sodium threepolyphosphate in medium-cement corundum castable with cement content decrease of 2,5 % — gas permeability increase in 12 times and differences in water evaporation temperature reduce to 4 °С (against 50 °С); in multi-cement corundum castable with cement content decrease of 2,5 % — differences in water evaporation temperature reduce to 10 °C;

– brand REFPAC 100 comparison to polycarboxylate esters and sodium threepolyphosphate in terms of differences in flow of “freshly prepared” and “aged” low-cement castables, made using high-purity bauxite and silica fume, reduce to 17 % (against 19 and 41 %); vibration flow of “freshly prepared” and “aged” castables, made using lower quality materials, increase of 98 and 8 %;

– brands REFPAC 288:REFPAC 388 at ratio of 50:50 comparison to REFPAC 388 in low-cement corundum-spinel castables at ambient temperature of 5 °C in terms of vibration flow of “freshly prepared” and “aged” masses increase of 4 and 80 % with samples` compressive strength decrease of 7 % after curing and 4 % after drying; at ratio of 75:25 comparison to 62,5:37,5 at 20 °C — terms of vibration flow of “freshly prepared” and “aged” masses increase of 10 and 14 % with samples` compressive strength increase of 16 % after curing and 4 % after drying;

– brand REFPAC 500 comparison to Peramin AL 200 and/or Peramin AL 300 in low-cement castables with high-purity materials in terms of time for massive precipitation of calcium aluminate reduce in 10 and 3 times at temperatures of 5 and 20 °С, and also increase in 2 times at 35 °С;

– polycarboxylate esters with length side chain and very short side chain in low-cement corundum castable with lower and high-purity silica fume;

– brand FS 10 in cement-less corundum castable in terms of CMOR increase of 18 %, but comparison to sodium threepolyphosphate — to its reduction of 10 %.

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Published
2020-12-30
How to Cite
Chaplianko, S. V., & Nikichanov, V. V. (2020). Deflocculants for refractory castables (review). Scientific Research on Refractories and Technical Ceramics, 120, 98-114. https://doi.org/10.35857/2663-3566.120.09