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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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Journal Article
TL;DR: The Nebraska Department of Roads in 1956 performed an experiment involving the use of hydrated l ime in the stabilization of plast ic so i l s and in the upgrading of inferior base course mater ia l s as mentioned in this paper.
Abstract: The Nebraska Department of Roads in 1956 performed an experiment involving the use of hydrated l ime in the stabilization of plast ic so i l s , and in the upgrading of inferior base course mater ia l s . The experiment i n cluded a pre l iminary laboratory study and a f ie ld construction project . T h i s paper reports and summar izes the tests p e r formed on the various mater ia ls before and after adding hydrated l ime, and presents the resul ts of deflection measurements at hal f -year intervals s ince the construction of the f ie ld project .

25 citations

Patent
04 Dec 1978
TL;DR: In this article, a process for the selective ortho-alkylation of a phenolic compound having at least one orthopositioned a hydrogen atom by catalytically reacting the compound with an alcohol in the vapor phase was described.
Abstract: This invention relates to a process for the selective ortho-alkylation of a phenolic compound having at least one ortho-positioned a hydrogen atom by catalytically reacting the phenolic compound with an alcohol in the vapor phase. In this process, the reaction of the phenolic compound with the alcohol is carried out at a temperature of from 300° to 550° C. in the presence of a mixed oxide catalyst of manganese, silicon, and one or more additives selected from the group consisting of magnesium oxide, calcium oxide, strontium oxide, and barium oxide. The catalyst used in this invention exhibits not only excellent catalytic activity in the selective ortho-alkylation of phenols but also continuous stability of the activity, good shapability, and good mechanical strength.

24 citations

Patent
04 May 2011
TL;DR: In this paper, a high-temperature sulfur solidifying agent for desulfurization in a coal blending burner was proposed, which comprises the following raw materials in percentage by weight: 38-42% of calcium oxide, 9-12% of silicon dioxide, 3-5% of sodium carbonate, 6-8% of magnesium oxide, 7-9% of iron sesquioxide, 11-13% of aluminium oxide, 4-5%) of titanium dioxide, 2-3% of potassium oxide, 3 5% of vanadium pentoxide and 4
Abstract: The invention discloses a high-temperature sulfur solidifying agent for desulfurization in a coal blending burner, relating to a sulfur solidifying agent for reducing emission of SO2 of fire coal. The high-temperature sulfur solidifying agent comprises the following raw materials in percentage by weight: 38-42% of calcium oxide, 9-12% of silicon dioxide, 3-5% of sodium carbonate, 6-8% of magnesium oxide, 7-9% of iron sesquioxide, 11-13% of aluminium oxide, 4-5% of titanium dioxide, 2-3% of sodium lignin sulfonate, 2-3% of potassium oxide, 3-5% of vanadium pentoxide and 4-6% of silicon carbide. By utilizing the high-temperature sulfur solidifying agent, the desulfurization efficiency is greatly improved, 80% of SO2 of the fire coal can be solidified, the load of flue gas desulfurization at the later stage is greatly reduced; after desulfurization, a boiler leads the discharged powdery coal ash and slag at the bottom of the boiler are ground into cement fineness so as to lead the compression strength to reach more than 16.0Mpa for 28 days, the burning of the fire coal is fuller, the residual carbon amount of the discharged powdery coal ash is reduced, the heat efficiency of the boiler is improved, and simultaneously the coking problem brought by the fire coal of the coal firing boiler is solved.

24 citations

Journal ArticleDOI
TL;DR: In this article, the authors evaluated the effect of adding calcium oxide (0, 0.5; 1.0, 1.5, 1, 5, and 2.0% of dry matter) on the chemical composition and ruminal degradability of the dry matter and neutral detergent fiber.
Abstract: It was evaluated the addition of calcium oxide (0; 0.5; 1.0; 1.5; and 2.0% of dry matter) effect on the chemical composition and ruminal degradability of the dry matter and neutral detergent fiber, on the losses of dry matter, and on the microbial population in sugar cane silages. A design with five levels of calcium oxide and three replications was used. All the variables were influenced by the addition of calcium oxide in the silages, except the composition in acid detergent insoluble protein, water soluble carbohydrates and lignin. The dry matter content and pH linearly increased while the contents of organic matter, hemicellulose and crude protein linearly decreased with the levels of calcium oxide. Neutral detergent fiber corrected for ashes and protein and acid detergent fiber were adjusted for the quadratic models with calculated minimal values of 33.3 and 22.5% for the levels 1.73 and 1.49% of calcium oxide, respectively. The in vitro digestibility of the dry matter and the content of amoniacal nitrogen adjusted to quadratic models with maximal levels of 80.1% and 9.1% for the levels of 1.8 and 0.7% of calcium oxide, respectively. The minimal production of gas (3.18%) was observed at the level of 1.39% of calcium oxide. Production of effluent and recovery of dry matter of the ensiled mass showed a reduction and a linear increase, respectively, with addition of calcium oxide. The highest lactic acid bacterial population was observed in the silage treated with 1.5% of calcium oxide. The addition of calcium oxide increased degradability of the soluble fraction of the dry matter, which was higher than 50% and reduced the non- degradable fraction of the neutral detergent fiber. Addition of calcium oxide level higher than 1.0% in the sugar cane during ensilage improves in vitro dry matter digestibility and the recovery of dry matter, increases populations of lactic acid bacteria and reduces production of yeasts.

24 citations

Journal ArticleDOI
01 Feb 2019-Fuel
TL;DR: In this article, the role of different flux agents on coal ash viscosity temperature properties was investigated by a combination of molecular dynamics simulations and thermodynamic calculations, and the results from the current work are expected to provide new clues to find strategies controlling the fusion behaviour of coal ash systems.

24 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023101
2022186
2021116
2020234
2019350
2018432