Canon Kabushiki Kaisha

Tokyo University of Science Educational Foundation Administrative Organization

National Institute of Advanced Industrial Science and Technology

Kyoto University

Tokyo Institute of Technology

University of Yamanashi

Taiheiyo Cement Corporation

Sophia University

Soichiro Okamura

Satoshi Wada

Hiroshi Funakubo

Nobuhiro Kumada

Takashi Iijima

Masaki Azuma

Makoto Kubota

Kaoru Miura

Toshihiro Ifuku

Jumpei Hayashi

Hiroshi Uchida

Kenji Takashima

Shinichiro Saito

Olga Alexandrovna Smirnova

Kenichi Takeda

Takashi Nakajima

Takanori Matsuda

Tatsuo Furuta

Takayuki Suzuki

Takayuki Watanabe

Zuyi Zhang

Yosuke Inoue

Junichi Terasaki

Tetsuo Ogiri

Kenichi Honma

Hajime Wada

Keisuke Yamato

Naoki Ueno

Tsuyoshi Matsura

Tomosato Okubo

Hiroshi Harada

Takahiro Hayashida

Takuya Shindo

Yoshihisa Tanaka

Yoshiaki Sakamoto

To provide a device for removing radioactive cesium from waste material containing radioactive cesium, doing so at low energy and in a dependable manner. The removal devicefor radioactive cesium is provided with: a rotary kilnwhich is provided with a burnersupplying from the kiln outlet an organic matter Ocontaminated with radioactive cesium, and an inorganic matter charging portsupplying from the kiln inlet inorganic matter Scontaminated with radioactive cesium, and which is employed to burn the organic matter Otogether with the inorganic matter S; and a recovery device cooling tower, a cyclone, a bag filterfor recovering cesium that has volatilized in the rotary kiln. A drying/crushing device (dryer, crusher) for drying and crushing the organic matter Oprior to charging the radioactive cesium-contaminated organic matter to the rotary kiln can be provided. Additionally, a reforming/drying/crushing device (reformer, dryer, crusher) for reforming, drying, and crushing the inorganic matter Scan be provided. During burning of the organic matter Otogether with the inorganic matter S, a calcium source can be added as a reaction accelerant A to the rotary kiln.

Removal device for radioactive cesium

Provided is a piezoelectric material excellent in piezoelectricity. The piezoelectric material includes a perovskite-type complex oxide represented by the following General Formula (1).A(ZnTi)MO&#x2003;&#x2003;(1)wherein A represents at least one kind of element containing at least a Bi element and selected from a trivalent metal element; M represents at least one kind of element of Fe, Al, Sc, Mn, Y, Ga, and Yb; x represents a numerical value satisfying 0.4&#x2266;x&#x2266;0.6; and y represents a numerical value satisfying 0.1&#x2266;y&#x2266;0.9.

Metal oxide

Provided are a ferroelectric material having good ferroelectricity and good insulation property, and a ferroelectric device using the ferroelectric material. In the present invention, the ferroelectric material includes a metal oxide having a perovskite-type crystal structure, in which: the metal oxide contains bismuth ferrite whose iron is substituted by manganese, and at least one of a copper oxide and a nickel oxide; the bismuth ferrite is substituted by manganese at a substitution ratio of 0.5 at. % or more to 20 at. % or less with respect to a total amount of iron and manganese; and at least one of the copper oxide and the nickel oxide is added in an amount of 0.5 mol % or more to 20 mol % or less with respect to the bismuth ferrite whose iron is substituted by manganese.

Ferroelectric material, method of producing ferroelectric material, and ferroelectric device

Provided is a piezoelectric material including a lead-free perovskite-type composite oxide which is excellent in piezoelectric characteristics and temperature characteristics and is represented by the general formula (1):ABO-A'BO-A&#x2033;B&#x2032;Oin which A is a Bi element; A&#x2032; is a rare earth element including La; B is at least one element selected from Ti, Zn, Sn and Zr; A&#x2033; is at least one element selected from Ba, Sr and Ca; B&#x2032; is at least one element selected from divalent, trivalent, pentavalent, tetravalent, and hexavalent elements; and x is a value of 0.10 or more and 0.95 or less, y is a value of 0 or more and 0.5 or less, and z is a value of 0 or more and 0.7 or less, provided that x+y+z=1.

Piezoelectric material

A cement kiln chlorine/sulfur bypass system wherein the equipment cost is suppressed and the sulfur included in a combustion gas bled from a cement kiln is separated and effectively utilized. The cement kiln chlorine/sulfur bypass system comprises an air bleed means for bleeding a kiln exhaust gas passage, which runs from the end of the cement kiln to a bottom cyclone, of a part of the combustion gas, a separating means for separating dust in the gas bled by the air bleed means into coarse particles and fine particles, and a wet dust collector for collecting dust from the gas containing the fine particles separated by the separating means. The separating means is preferably a classifier in which the cut size is changeable. The wet dust collector is preferably a mixing scrubber. The mixing scrubber preferably comprises a circulating liquid tank to which dust slurry collected by the mixing scrubber is supplied and a circulating system by which a part of the dust slurry in the circulating liquid tank is returned to the mixing scrubber.

Cement kiln chlorine/sulfur bypass system

An oxynitride piezoelectric material, which exhibits ferroelectricity and has good piezoelectric properties, and a method of producing the oxynitride piezoelectric material. The oxynitride piezoelectric material includes a tetragonal perovskite-type oxynitride represented by the following general formula (1):ABiBB'ON&#x2003;&#x2003;(1),where A represents a divalent element, B and B&#x2032; each represent a tetravalent element, x represents a numerical value of 0.35 or more to 0.6 or less, y represents a numerical value of 0.35 or more to 0.6 or less, z represents a numerical value of 0.35 or more to 0.6 or less, and &#x3b4;1 and &#x3b4;2 each represent a numerical value of &#x2212;0.2 or more to 0.2 or less, in which the A includes at least one kind selected from Ba, Sr, and Ca and the B and the B&#x2032; each include at least one kind selected from Ti, Zr, Hf, Si, Ge, and Sn.

Oxynitride piezoelectric material and method of producing the same

Provided are a piezoelectric material without using lead or an alkali metal, the piezoelectric material having a stable crystal structure in a wide temperature range, high insulation property, and high piezoelectric property, and a piezoelectric element using the piezoelectric material, in which the piezoelectric material is made of a metal oxide having a tetragonal crystal structure and expressed by Ba(SiGeTi)O(here, 0&#x2266;x&#x2266;1, 0&#x2266;y&#x2266;1, and 0&#x2266;z&#x2266;0.5), the piezoelectric element includes the piezoelectric material and a pair of electrodes sandwiching the piezoelectric material, and at least one of the pair of electrodes is made of SrRuOor Ni.

Metal oxide, piezoelectric material and piezoelectric element

A method to efficiently reduce lead content of cement without exerting influence upon quality of the cement. The method comprises the steps of: controlling O2 concentration of combustion gas in an inlet end of a cement kiln to 5% or lower and/or CO concentration thereof 1000 ppm or more; extracting a part of combustion gas from the cement kiln and collecting dust contained in the combustion gas; and collecting lead from the dust collected. With this, the area where raw material temperature in the cement kiln is between 800&#xb0; and 1100&#xb0; can be turned into reducing atmosphere to sharply increase volatilization rate of lead, and collection of lead from the dust allows lead content of cement to efficiently be reduced without exerting influence upon quality of the cement.

Method for removing lead from cement burning furnace

A treatment system to efficiently remove lead from dust contained in extracted cement kiln combustion gas while reducing facility and running costs. A treatment systemcomprising: a probefor extracting a part of combustion gas, while cooling it, from a kiln exhaust gas passage, which runs from an inlet end of a cement kiln to a bottom cyclone; a classifierfor separating coarse powder from dust contained in the combustion gas extracted by the probe; a wet dust collectorfor collecting dust from the extracted gas containing fine powder discharged from the classifier; and devicesfor feeding sulfurizing agent for sulfurizing lead contained in the kiln exhaust gas to the wet dust collector, and others. From the sulfurizing-agent feedersare preferably added the sulfurizing agents to a circulation liquid tankor a pumpfor circulating slurry. The slurry obtained by the wet dust collectoris separated into froth including lead and tail side slurry including gypsum by a flotation facility

System and method for treating dust contained in extracted cement kiln combustion gas

Growing community of inventors

Tokyo, Japan

Soichiro Okamura