Topic
Calcium oxide
About: Calcium oxide is a research topic. Over the lifetime, 7600 publications have been published within this topic receiving 66104 citations. The topic is also known as: caustic lime & quicklime.
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TL;DR: In this article, the integrated sorptionenhanced chemical looping reforming and water splitting (SECLR-WS) process was proposed for hydrogen (H2) production from biogas using iron oxide as an oxygen carrier and calcium oxide (CaO) as a carbon dioxide (CO2) adsorbent.
29 citations
TL;DR: In this article, the effects of deviator stress, molding moisture content, stabilizer type and content, and soil type on the resilient modulus (Mr) of lime- and cement-stabilized cohesive soils were investigated by using Hydrite R (kaolinite) and sodium bentonite (montmorillonite) blends.
Abstract: The effects of deviator stress, molding moisture content, stabilizer type and content, curing period, and soil type on the resilient modulus (Mr) of lime- and cement-stabilized cohesive soils were investigated by using Hydrite R (kaolinite) and sodium bentonite (montmorillonite) blends. It was found that Mr increases with decreasing deviator stress, increasing lime and cement content, and extended curing period. Moisture variations around optimum had little effect on Mr with higher lime contents. Multiple regression analyses and Student's t-tests indicated that all the factors investigated were significant and could be related to Mr by predictive regression equations. For a given stabilizer type and content, the low-plasticity clay (CL) soil produced the best results. The cement-stabilized CL soil normal cured for 28 days produced the highest Mr value. However, cement stabilization was not found to be very effective for the high-plasticity clay (CH) soil. Mineralogical composition has a marked effect on t...
29 citations
Patent•
24 May 1988
TL;DR: In this paper, the authors proposed a method to obtain the title composition outstanding in creep resistance, lubricity and wear resistance in addition to the excellent characteristics inherent in the resin, suitable as a sliding member by incorporating a tetrafluoroethylene resin with calcium fluoride and/or calcium oxide.
Abstract: PURPOSE: To obtain the title composition outstanding in creep resistance, lubricity and wear resistance in addition to the excellent characteristics inherent in the resin, suitable as a sliding member by incorporating a tetrafluoroethylene resin with calcium fluoride and/or calcium oxide. CONSTITUTION: The objective composition can be obtained by incorporating (A) 100 pts.wt. of a tetrafluoroethylene resin, i.e. tetrafluoroethylene homopolymer with (B) 5-90 pts.wt. of calcium fluoride and/or calcium oxide (with reaction with the moisture in air suppressed by e.g., treatment of the surface), pref. ≤50 (esp. ≤30)μm in average granular size, and, if needed, (C) a heat-resistant polymeric material (e.g., polyamideimide resin), heat-resistant inorganic fiber (e.g., glass fiber), heat-resistant organic fiber (e.g., aromatic polyamide fiber), etc. COPYRIGHT: (C)1989,JPO&Japio
29 citations
TL;DR: In this paper, a 100% HWIR was used to prepare SiO2-Al2O3-Fe2O-3-CaO glass-ceramic samples, which exhibited a superior compressive strength, volume density, and water absorption of 204.84 MPa, 2.80 g/cm3, and 1.20% respectively.
29 citations
01 Jan 2005
TL;DR: In this paper, the effect of particle size and kiln temperature on reaction rate and the mechanism that controls reaction rate are explained and dimensionless variables which delineate between mass transfer, heat transfer and reaction rate control are identified and used to construct a kinetic behaviour diagram.
Abstract: The calcination of calcium carbonate (limestone) is an important step in the regeneration of kraft pulping chemicals and in the production of industrial calcium oxide (quicklime). Better understanding of the kinetics can lead to improved lime kiln efficiencies in both production rate and specific energy use. For this reason a fundamental investigation into lime calcination kinetics for the purpose of improving kiln efficiency was undertaken. Important kinetic equations that apply to calcium carbonate calcination are reviewed. The effect of particle size and kiln temperature on reaction rate and the mechanism that control reaction rate are explained. Dimensionless variables which delineate between mass transfer, heat transfer and reaction rate control are identified and used to construct a kinetic behaviour diagram. The diagram is used to explain ways of improving kiln energy efficiency. This premise was tested experimentally in a laboratory kiln, and then transferred to an industrial kiln, where a 13% increase in energy efficiency and production was recorded.
28 citations