Toda Kogyo Corporation

Sakai Chemical Industry Co., Ltd.

Koji Kakuya

Kenji Okinaka

Masayuki Uegami

Tomoko Okita

Junichi Kawano

Yasuhiko Fujii

Nobukatsu Shigi

Andreas D Jazdanian

Atsuko Yasunaga

Soichi Yatagai

Soichi Yatagi

A method for producing hydrotalcite particles includes dissolving aluminum hydroxide in an alkaline solution to prepare an aluminate solution, causing a reaction of the aluminate solution prepared in the first step with carbon dioxide to precipitate a low-crystallinity aluminum compound, causing a first-order reaction by mixing the low-crystallinity aluminum compound with a magnesium compound to prepare a reactant containing hydrotalcite nuclear particles, and causing a hydrothermal reaction of the reactant to synthesize hydrotalcite particles. The hydrotalcite particles can impart excellent heat resistance, transparency, flowability, and are useful as a resin stabilizer.

Hydrotalcite particles, method for producing hydrotalcite particles, resin stabilizer containing hydrotalcite particles, and resin composition containing hydrotalcite particles

Iron composite particles for purifying soil or ground water, comprise &#x3b1;-Fe and magnetite, and having a ratio of a diffraction intensity Dof (110) plane of &#x3b1;-Fe to a sum of a diffraction intensity Dof (311) plane of magnetite and the diffraction intensity D(D/(D+D)) of 0.30 to 0.95 as measured from X-ray diffraction spectrum of the iron composite particles, an Al content of 0.10 to 1.50% by weight and an S content of 3500 to 7000 ppm; a process for producing the iron composite particles; a purifying agent containing the iron composite particles; a process for producing the purifying agent; and a method for purifying soil or ground water.

Iron composite particles for purifying soil or ground water, process for producing the same, purifying agent containing the same, process for producing the purifying agent and method for purifying soil or ground water

A purifying agent for purifying soil or ground water which comprises a water suspension containing iron composite particles comprising &#x3b1;-Fe and magnetite, and having an average particle diameter of 0.05 to 0.50 &#x3bc;m, an S content of 3500 to 10000 ppm and an Al content of 0.10 to 1.50% by weight, and polyaspartic acid or a salt thereof. The purifying agent is capable of decomposing aliphatic organohalogen compounds or aromatic organohalogen compounds contained in the soil or ground water in an efficient, continuous and economical manner.

Purifying agent for purifying soil or ground water, process for producing the same, and method for purifying soil or ground water using the same

Iron particles for purifying soil or ground water of the present invention comprise a mixed phase of &#x3b1;-Fe phase and FeOphase, and having a BET specific surface area of 5 to 60 m/g, an Fe content of not less than 75% by weight based on the weight of the iron particles and a sulfur content of not less than 1,000 ppm. The iron particles are capable of decomposing or insolubilizing harmful substances such as organohalogen compounds and/or heavy metals, cyanogen, etc. contained in the soil or ground water in efficient, continuous and economical manners.

Process for purifying contaminated soil or groundwater with iron particles

Iron particles for purifying contaminated soil or ground water

Growing community of inventors

Ube, Japan

Koji Kakuya