Olfactory system

Kaneyasu, Masayoshi

doi:10.1016/s1386-2766(96)80038-7

Cited by 1 publication

(1 citation statement)

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“…For example, bricks made from high CaO were fired in a kiln where the temperature reached 540uC within 3 min, 820uC after 9 min, was held at 1475uC for 5 h and then cooled. The hydration resistance of MgO-CaO (25 wt-%) clinker as well as MgO clinker and MgO spinel clinker regardless of the particle size was improved by treating the surface with a silicone (organosilicon) compound solvent by Kaneyasu et al 109,110 The weight gain of treated clinker after 60 days at 30uC with 80%RH was only half that of untreated clinker. The total SiO 2 increase is 0?14 wt-%, which is considered too low to deteriorate the properties of the clinker.…”

Section: Miscellaneous Surface Treatmentsmentioning

confidence: 99%

Improving the hydration resistance of lime-based refractory materials

Li¹,

Zhang²,

Lee³

2008

International Materials Reviews

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Studies to improve the hydration resistance of lime-based materials are reviewed. The methods described include densification of the lime aggregate by addition of sintering aids and surface treatment. Methods for assessing hydration resistance are also reviewed. Additions of ZrO 2 , TiO 2 (including Ti chelating compounds) and rare earth oxides can improve the hydration resistance of CaO aggregate by, it is believed, enhancing solid state sintering without sacrificing refractoriness via formation of hydration resistant solid solutions. Fe 2 O 3 , Al 2 O 3 (as well as Al chelating compounds and Al metal), CuO and V 2 O 5 , act as liquid forming aids. These additives improve the sintering of lime and subsequently the hydration-resistance via formation of liquids at high temperature which cool to produce hydration-resistant solids surrounding the lime polycrystals. However, the liquids formed may significantly reduce the refractoriness of lime materials, thus eroding their particular advantage. The same problem is thought to arise on addition of salts such as CaCl 2 and NaF. The hydration resistance of CaO aggregates can also be improved by surface carbonation and surface treatment using acids, phosphates, machine oils, silicones and fluxes. Surface carbonation of CaO aggregate is proving to be a promising experimental method, but practical problems currently limit its application on an industrial scale. A combination of the two methods mentioned above should therefore be even more effective in improving the hydration resistance of CaO refractory materials.

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Section: Miscellaneous Surface Treatmentsmentioning

confidence: 99%