Method for producing iron oxyhydroxide and adsorbing material comprising iron oxyhydroxide

An iron oxyhydroxide, adsorption material technology, applied in iron oxide/iron hydroxide, alkali metal oxide/hydroxide, chemical instruments and methods, etc., can solve the problems of difficult recovery and difficult operation of adsorbed substances

Inactive Publication Date: 2008-02-06
JAPAN SCI & TECH CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the iron oxyhydroxide in Patent Document 4 has a small particle diameter, i.e., micron order, it is diffic

Method used

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  • Method for producing iron oxyhydroxide and adsorbing material comprising iron oxyhydroxide
  • Method for producing iron oxyhydroxide and adsorbing material comprising iron oxyhydroxide
  • Method for producing iron oxyhydroxide and adsorbing material comprising iron oxyhydroxide

Examples

Experimental program
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Effect test

Embodiment I-1

[0197] Ferric chloride (FeCl 3 ·6H 2 O) dissolved in water to a concentration of 0.1 mol / l. A 2 mol / l NaOH aqueous solution was added to the resulting solution while stirring at room temperature so that the pH of the solution was 4. The precipitated product generated in the solution was left to stand for 24 hours, followed by suction filtration, whereby a precipitate was obtained. The resulting precipitate was dried at 50 °C for 48 hours in an oven to obtain FeOOH.

[0198] The BET specific surface area of ​​FeOOH thus obtained is 50.6m 2 / g, and the average particle diameter as an aggregate is 200 μm. The obtained ferric oxyhydroxide was placed in pure water so that the slurry concentration (weight percentage of dry ferric oxyhydroxide in water) reached 5%, and then the mixture was stirred at room temperature for 5 minutes. After stirring, the resulting mixture was filtered with suction to obtain ferric oxyhydroxide. The obtained iron oxyhydroxide was dried at 55°C for ...

Embodiment I-2～I-7

[0207] The iron oxyhydroxides of Examples I-2 to I-7 were prepared in the same manner as in Example I-1, except that the drying temperature and drying time in step (I-d) were changed as shown in Table 1. Its physical properties are shown in Table 1.

Embodiment II-1

[0224]Ferric chloride (FeCl 3 ·6H 2 O) dissolved in water to a concentration of 0.1 mol / l. A 2 mol / l NaOH aqueous solution was added to the resulting solution under stirring at room temperature so that the pH of the solution was 4. The precipitated product produced in the solution was then allowed to stand for 24 hours and then filtered with suction, whereby a precipitate was obtained. The obtained precipitate was dried in a constant temperature oven at 50° C. for 48 hours in a 100% carbon dioxide atmosphere to obtain FeOOH.

[0225] The obtained ferric oxyhydroxide was placed in pure water so that the slurry concentration (weight percentage of dry ferric oxyhydroxide in water) reached 5%, and then the mixture was stirred at room temperature for 5 minutes. After stirring, the resulting mixture was filtered with suction to obtain ferric oxyhydroxide. The obtained iron oxyhydroxide was dried at 55°C for 24 hours. After drying, the iron oxyhydroxide was heat-treated at 160° ...

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Abstract

Provided are a method for advantageously producing iron oxyhydroxide exhibiting excellent adsorbing capability for harmful substances, such as a phosphorus component and an environmental hormone, in an industrial waste water and an exhaust gas; and an adsorbing material comprising the iron oxyhydroxide produced by the method as a main component. Specifically, provided are a method for producing iron oxyhydroxide, characterized in that it comprises: (a) a step of adding a base to an aqueous solution containing an iron ion so as for the resultant mixture to have a pH of 9 or less, to thereby form a precipitate containing iron oxyhydroxide, (b) a step of drying the above precipitate at a temperature of 100 DEG C or lower, to thereby prepare iron oxyhydroxide, (c) a step of contacting the resultant iron oxyhydroxide with water, and (d) a step of subjecting the resultant iron oxyhydroxide to a heating treatment in a gas atmosphere having an inert gas concentration of 80 % or more at a temperature of 100 to 280 DEG C; and an adsorbing material comprising the iron oxyhydroxide produced by the method as a main component.

Description

technical field [0001] The invention relates to a method for preparing iron oxyhydroxide and an adsorption material containing iron oxyhydroxide. More specifically, the present invention provides a method for advantageously preparing iron oxyhydroxide having a very good adsorption capacity for harmful substances such as phosphorus contained in industrial waste water, waste gas, etc. The main component of the adsorbent material. Background technique [0002] Recently, with the development of science and technology, various chemical substances are prepared and used. There are many chemical substances that adversely affect human health and the ecological environment. Harmful substances to be removed from water include, for example: organic or inorganic phosphorus, fluorine, arsenic, molybdenum, chromium, antimony, selenium, boron, tellurium, beryllium and cyanide. Hazardous substances to be removed from exhaust gases include, for example: hydrogen sulfide, mercaptans, hydroc...

Claims

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Application Information

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IPC IPC(8): C01G49/02B01D53/46B01J20/28B01J20/30B01J20/06C02F1/28
Inventor 前一广牧泰辅山本笃志
Owner JAPAN SCI & TECH CORP
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