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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 ArticleDOI
11 May 2020-Minerals
TL;DR: In this paper, the effects of various substances on soil contaminated with cobalt (Co) on the mass and content of cobalt in the main crop (Hordeum vulgare L.) and the after-crop (Synapis alba L.).
Abstract: This study was undertaken to determine the effects of various substances on soil contaminated with cobalt (Co) on the mass and content of cobalt in the main crop—spring barley (Hordeum vulgare L.)—and the after-crop—white mustard (Synapis alba L.). Manure, clay, charcoal, zeolite, and calcium oxide were used for phytostabilization. Cobalt was applied in the form of CoCl2 in doses of 0, 20, 40, 80, 160, and 320 mg/kg soil. Amendments in the form of manure, clay, charcoal, and zeolite were applied in an amount of 2% in relation to the weight of the soil in a pot, with calcium oxide at a dose of 1.30 g CaO/kg of soil. The highest cobalt doses resulted in a significant reduction in yield of both plants and in tolerance index for cobalt. Increasing contamination of soil with cobalt resulted in a major and significant increase in its content in plants and a reduction in cobalt translocation factor in both plants. Amendments used in phytostabilization had a significant effect on growth and development of oat and content of cobalt in plants. The strongest effect on the yield of above-ground parts was exerted by manure (both plants) and calcium oxide (white mustard), while the strongest effect on weight of roots was exerted by calcium oxide (both plants) and zeolite (white mustard). The addition of manure, zeolite and calcium oxide to soil caused an increase of the tolerance index for both plants, while the addition of clay only had a positive effect for white mustard. All substances used in phytostabilization (except zeolite) decreased cobalt content of roots, and manure and calcium oxide in above-ground parts of spring barley; manure and zeolite only in above-ground parts, and calcium oxide in both organs of white mustard. Most of them also reduced bioconcentration of cobalt in above-ground parts, calcium oxide decreased cobalt content in roots of both plants, and manure in roots of spring barley. The effect on cobalt translocation was less clear, but most substances used in phytostabilization increased the transfer of cobalt from the soil to plants. White mustard had higher ability to accumulate cobalt than spring barley.

21 citations

Patent
20 Apr 1993
TL;DR: In this paper, a method for the preparation of porous calcium carbonate particles of which each of the particles is not an aggregate but has ink bottle-shaped pores each not communicating with the others is proposed.
Abstract: A method is proposed for the preparation of porous calcium carbonate particles of which each of the particles is not an aggregate but has ink bottle-shaped pores each not communicating with the others. The method comprises: (a) blending particles of heavy calcium carbonate having a specific particle size distribution with from 0.1 to 0.3% by weight of a porosity-forming agent, e.g., sodium chloride; (b) calcining the powder blend at a temperature in the range from 800° C. to 1000° C. to decarbonate the calcium carbonate particles into particles of calcium oxide having pores developed therein; (c) slaking the particles of calcium oxide with steam to convert the calcium oxide particles into particles of calcium hydroxide; (d) drying the particles of calcium hydroxide at a temperature in the range from 100° C. to 350° C.; and (e) carbonating the dried particles of calcium hydroxide with carbon dioxide gas at a temperature in the range from 600° C. to 750°C.

20 citations

Patent
28 Aug 1989
TL;DR: A mixture of an alkali chloride solvent and reactants comprised of bismuth sesquioxide, calcium oxide, strontium oxide and copper oxide, or precursors therefor, is heated to melt the chloride solvent in which the reactants then dissolve and react precipitating a Bi-Ca-Sr-Cu-O superconductive material which is comminuted to produce a sinterable powder as mentioned in this paper.
Abstract: A mixture comprised of an alkali chloride solvent and reactants comprised of bismuth sesquioxide, calcium oxide, strontium oxide and copper oxide, or precursors therefor, wherein the reactants are formulated to produce a superconducting reaction product, is heated to melt the chloride solvent in which the reactants then dissolve and react precipitating a Bi-Ca-Sr-Cu-O superconductive material which is comminuted to produce a sinterable powder

20 citations

Patent
19 Jul 2006
TL;DR: In this article, an alkaline calcium bentonite with anion exchanging function was made using active carclazyte and calcium oxide as raw material, which can react with organic acid to prepare composite layered nanometer material which can be applied in the coating, plastic and new adsorptive material domain.
Abstract: The invention discloses an alkaline calcium bentonite and making method, which comprises the following steps: adapting active carclazyte and calcium oxide as raw material; mixing the raw material evenly; reacting the calcium oxide and water to produce calcium hydroxide; diffusing the calcium hydroxide in the active carclazyte layers; reacting one of two oxyhydrogen base with hydrogen of active carclazyte to produce the alkaline calcium bentonite with anion exchanging function. The invention can react with organic acid to prepare composite layered nanometer material, which can be applied in the coating, plastic and new adsorptive material domain.

20 citations

Patent
01 Feb 1977
TL;DR: In this article, over-based calcium sulfonates and concentrated oily solutions thereof are prepared by reacting a solution of alkylbenzene sulfonic acids with an excess of a calcium oxide having a medium or low activity towards water and with carbon dioxide.
Abstract: Overbased calcium sulfonates and concentrated oily solutions thereof are prepared by reacting a solution of alkylbenzene sulfonic acids with an excess of a calcium oxide having a medium or low activity towards water and with carbon dioxide. Oily solutions of overbased calcium sulfonate obtained from such a calcium oxide are perfectly limpid and are easily filtrable.

20 citations


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