PROBLEM TO BE SOLVED: To provide a fluoride ion capturing material which can be used not only in a general-purpose mixing method but also in a liquid-through vessel or column when a fluoride ion of low concentration is removed by the fluoride ion capturing material, simplifies a discharge operation of the treated liquid and is made inexpensive. SOLUTION: Partially decomposed dolomite obtained by firing dolomite (MgCa(CO 3 ) 2 ) hardly collapses in water and exhibits extremely high adsorptivity to the fluoride ion. The partially decomposed dolomite can be scattered on/mixed with soil directly, be put in the liquid-through vessel and used, and be packed in the liquid-through column and used, and achieve the waste water regulation of 8 ppm fluoride ion. COPYRIGHT: (C)2008,JPO&INPIT

Fluoride ion capturing material and its using method

PROBLEM TO BE SOLVED: To provide a magnesium oxide powder useful as an adsorbent or a waste water treating agent and to provide a method of manufacturing the same. SOLUTION: The magnesium oxide powder is aggregate of periclase crystallites each having 1-20 nm average crystal diameter, contains plate like primary aggregate having average particle diameter of 0.1-5 μm and has specific surface area of ≥80 m 2 /g and magnesium oxide content of ≥98 mass% after ignition at 1,400°C. COPYRIGHT: (C)2005,JPO&NCIPI

Magnesium oxide powder and method of manufacturing the same

The invention relates to a dephosphorization adsorbent for treating low-concentration-phosphorus-containing eutrophic water. The dephosphorization adsorbent is characterized in that crushed cement bricks are used as filler for adsorptive dephosphorization. According to the dephosphorization adsorbent, abandoned cement bricks of a building are used and are of small granular adsorbents after being crushed, so that the concentration of phosphorus in the water can be lowered effectively; compared with other common adsorbents, the adsorbent has a particularly obvious effect on lowering the phosphorus concentration of the low-concentration-phosphorus-containing water; the cement bricks are adsorbents which have the advantages of low cost and excellent performance; the dephosphorization adsorbent can be widely applied to the treatment on eutrophic water, and meanwhile, the field of recycling of the cement bricks as building wastes is developed.

Method and application for using building abandoned cement brick as dephosphorization filler

PROBLEM TO BE SOLVED: To provide a cryptocrystalline magnesia suitable for dehydration and solidification of highly-water containing soil and a method for producing the same, and to provide a dehydration and solidification method having a short dehydration time and providing sufficient dehydrated-cake strength. SOLUTION: The cryptocrystalline magnesia is produced by heating magnesium hydroxide and/or magnesium carbonate at ≥300°C and <1,000°C. In the cryptocrystalline magnesia, a powder X-ray diffraction spectrum at a wavelength of 1.5405Å has an apex of a peak at 2θ=42.8°±0.3°. The peak has a half-width on the basis of the baseline of 0.32-1.5°. The dehydration and solidification of highly water-containing soil becomes possible by mixing 30-300 kg of the cryptocrystalline magnesia per 1 t of the solid component of the highly water-containing soil having a water content of 100 mass% or more. COPYRIGHT: (C)2007,JPO&INPIT

Cryptocrystalline magnesia and method for producing the same

PURPOSE:To obtain inexpensively a phosphorus removing agent capable of utilizing effectively it as a phosphorus fertilizer by blending both carbonate of Ca as an essential material and calcium compd. as an acid to manufacture the phosphorus removing agent. CONSTITUTION:A phosphorus removing agent is manufactured by blending 0.05-5pts.wt. preferably 0.1-2pts.wt. calcium compd. such as CaCl2, CaO and Ca(OH)2 as an aid for 100pts.wt. carbonate of Ca. As carbonate of Ca being an essential material, dolomite and limestone generated naturally can be used in the various shapes such as a finely-divided powdery shape and a granular shape. To remove phosphorus dissolved into water by using the above-mentioned removing agent, the following methods are used wherein the phosphorus removing agent is introduced into water contg. phosphorus and the water contg. phosphorus is passed through a column packed with the phosphorus removing agent.

Phosphorus removing agent

PURPOSE:To provide a water treating agent effective for the removal of water- soluble polymer substances which are difficult to remove such as starch and polyvinyl alcohol. CONSTITUTION:A calcium compound which forms calcium oxide when baked such as calcium hydroxide, calcium carbonate, or calcium chloride is mixed with an aluminum compound which forms aluminum oxide when baked such as aluminum hydroxide, aluminum chloride, or aluminum nitrate and the mixture is baked at a temperature within the range of 1200 to 1600 deg.C. The mixture is so prepared that the weight ratio of calcium oxide to aluminum oxide is between 40/60 and 85/15, preferably between 70/30 and 80/20. This constitution results in the formation of a desired water treating agent.

Caluciummbased water treating agent

PURPOSE: To provide a process for treating waste water containing organic contaminated matters, which comprises effectively adsorbing and removing organic contaminated matters contained in waste water with magnesia prepared by buring a magnesium compound capable of forming magnesia by heat decomposition at a temperature in the range of from 500 to 700°C. COPYRIGHT: (C)1978,JPO&Japio

Process for trating waste water containing organic contaminated matters

PURPOSE: To remove fluorine ion in water in good efficiency by adsorbing fluorine ion dissolved in water by an adsorbent based on magnesia formed by baking a magnesium compound at 400W700°C. CONSTITUTION: An optional magnesia compound forming magnesia by decomposing magnesium hydroxide, magnesium carbonate or basic magnesium carbonate under heating is used as a stock material and this stock material is baked at 400W700°C for 40W60min by a conventional means to form a magnesia type adsorbent. Water having fluorine ion dissolved therein is contacted with this magnesia type adsorbent by means such as a powder adding method, a fluidizing method or the like to adsorb fluorine ion by the adsorbent. Because this method is not precipitatng reaction and is adsorbing reaction, there is no difficulty with precipitative separation as well as sludge byproduct is not generated. COPYRIGHT: (C)1982,JPO&Japio

Method for removal of fluorine ion

PURPOSE:To raise the efficiency for removing phosphorus contained in waste water by a process in which an adsorbent used for the adsorption of phosphorus present in the waste water is calcined in a specific temperature range, then an adsorbent having a higher adsorptivity than that of the calcined adsorbent is mixed with the calcined adsorbent in a specific supplementing ratio, and then the mixed adsorbent is brought into contact with waste water repeatedly. CONSTITUTION:Waste water and an adsorbent are brought into contact with each other continuously by a solid-liquid contacting apparatus so that phosphorus compounds present in waste water are adsorbed on the adsorbent. Then adsorbent on which a certain amount of phosphorus compounds are adsorbed is separated by sedimentation, dried, and then calcined at 350-700 deg.C. Then, a magnesia adsorbent having a higher adsorptivity than that of the calcined adsorbent is added to the calcined adsorbent in proportion of 0.5-20wt% on the basis of the total amount of the adsorbents and again brought into contact with the phosphorus-containing waste water. In this way, the adsorbent is repeatedly and effectively used.

Treating method of waste water containing phosphorus

PURPOSE:To enable treatment of waste water containing polyvinyl alcohol and/or starch by use of a treating agent consisting of calcium aluminate and calcium oxide. CONSTITUTION:A combination of calcium oxide and calcium aluminate is used as a treating agent. The agent is expressed by a general formula XCaO YAl2O3, where the ratio X/Y is usually between 3/1 and 3/5. The ratio of calcium oxide to alumina (CaO/Al2O3) is kept in the range of 1/9 - 9/1, preferably 7/3 - 8/2. The waste water containing polyvinyl alcohol and/or starch is treated by contacting it to the treating agent. The method is applicable to various waste water, particularly desizing waste water in textile industry and surface sizing waste water in paper industry.

Itaya Riyuutarou

Papers

Caluciummbased water treating agent

Process for trating waste water containing organic contaminated matters

Method for removal of fluorine ion

Treating method of waste water containing phosphorus

Treatment method for waste water containing polyvinyl alcohol and*or starch