Hydrothermal Detoxization of Slate Containing Asbestos and the Possibility of Application for Fertilizer of its Products

Journal Article · Wed Nov 24 00:00:00 EST 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3529320· OSTI ID:21513116

Myojin, Sachi; Yamasaki, Chizuko; Yamasaki, Nakamichi ^[1]; Kuroki, Toshihiro; Manabe, Wataru ^[2]

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1. Research Institute of Aqua Science and Technology 107 Ko, Sakawa-cho, Takaoka-gun, Kochi 789-1201 (Japan)
2. Research Institute of Technology, Konoshima Chemical Co., Ltd. 80 Koda, Takuma-cho, Mitoyo-city, Kagawa 769-1103 (Japan)

Hydrothermal decomposition of slate (building materials) containing asbestos has been attempted by using a NH{sub 4}H{sub 2}PO{sub 4} solution. Firstly, the alteration of chrysotile as a starting material was investigated under hydrothermal conditions of 200 deg. C, 12 hrs of reaction time and with a phosphate solution. It was confirmed that the original fibrous form of chrysotile had been perfectly collapsed by the SEM observation. The chrysotile (asbestos) disappeared to form Mg-Ca-Silicate (Ca{sub 7}Mg{sub 2}P{sub 6}O{sup 24}) estimated by XRD. The composition and chemical form of reaction products (Mg-Ca-Silicate) was predicted to application as a fertilizer. Fertilizer effect of these resulted product on cultivations of Japanese radish (leaves), soybeans and tomatoes, was examined by using a special medium of mixed soil with a low content of N, P, K and a thermal-treated zeolite one. The fertilizer effects of the product were compared to commercial fertilizers such as N, N-K-P and P types. In order to estimate the fertilizer effect, the size of crops, number of fruits and number of leaves were measured everyday. As a result, these hydrothermal products of slate containing asbestos were as good as commercial fertilizers on the market. Fruits groups especially had a good crop using the hydrothermal slate product. These results show that the main components of hydrothermal treatments slate are calcium silicate and magnesium phosphate. Its decomposition reaction products may have the possibility of application for fertilization of crops which require nucleic acid--phosphorus.

• OSTI ID: 21513116
• Journal Information: AIP Conference Proceedings, Vol. 1251, Issue 1; Conference: 2. international symposium on aqua science, water resource and low carbon energy, Sanya Hainan (China), 7-10 Dec 2009; Other Information: DOI: 10.1063/1.3529320; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AMMONIUM PHOSPHATES
ASBESTOS
BUILDING MATERIALS
CALCIUM SILICATES
COMPOSITE MATERIALS
DECOMPOSITION
FERTILIZATION
FERTILIZERS
MAGNESIUM PHOSPHATES
NUCLEIC ACIDS
PHOSPHORUS
SCANNING ELECTRON MICROSCOPY
SOILS
SOLUTIONS
TEMPERATURE RANGE 0400-1000 K
X-RAY DIFFRACTION
ZEOLITES
ALKALINE EARTH METAL COMPOUNDS
AMMONIUM COMPOUNDS
CALCIUM COMPOUNDS
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
HOMOGENEOUS MIXTURES
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MAGNESIUM COMPOUNDS
MATERIALS
MICROSCOPY
MINERALS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
SCATTERING
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
TEMPERATURE RANGE