JP2003192340A5 - - Google Patents

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JP2003192340A5
JP2003192340A5 JP2001396220A JP2001396220A JP2003192340A5 JP 2003192340 A5 JP2003192340 A5 JP 2003192340A5 JP 2001396220 A JP2001396220 A JP 2001396220A JP 2001396220 A JP2001396220 A JP 2001396220A JP 2003192340 A5 JP2003192340 A5 JP 2003192340A5
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aluminum hydroxide
solution
alkali
aluminate
producing aluminum
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JP2003192340A (en
JP4108974B2 (en
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アルミナ含有鉱石とアルカリ溶液とを混合し、該混合物を加熱処理して鉱石中のアルミナ分をアルカリ溶液中に溶解させアルミン酸アルカリ溶液とし、さらに該混合物に凝集剤を添加して未溶解分を沈降させる分離工程と、分離工程後で水酸化アルミニウムを析出させる工程の前に、アルミン酸アルカリ溶液に濾過助剤を加えてアルミン酸アルカリ溶液を濾過する工程を含み、この濾液から水酸化アルミニウムを析出させる水酸化アルミニウムの製造方法であって、前記濾過工程の濾過助剤にアルミン酸カルシウムを添加することにより水酸化アルミニウム中のＣａＯ濃度を低下させることを特徴とする水酸化アルミニウムの製造方法。An alumina-containing ore and an alkali solution are mixed, the mixture is heated, and the alumina content in the ore is dissolved in the alkali solution to obtain an alkali aluminate solution. Further, a flocculant is added to the mixture to remove the undissolved content. Including a separation step of settling and a step of precipitating aluminum hydroxide after the separation step and adding a filter aid to the alkali aluminate solution to filter the alkali aluminate solution. A method for producing aluminum hydroxide to be precipitated, wherein the CaO concentration in aluminum hydroxide is reduced by adding calcium aluminate to the filter aid in the filtration step. アルミナ含有鉱石とアルカリ溶液とを混合し、該混合物を加熱処理して鉱石中のアルミナ分をアルカリ溶液中に溶解させアルミン酸アルカリ溶液とし、さらに該混合物に凝集剤を添加して未溶解分を沈降させる分離工程と、この上澄み液であるアルミン酸アルカリ溶液から水酸化アルミニウムを析出させる工程を含む水酸化アルミニウムの製造方法であって、前記分離工程の凝集剤にアルミン酸カルシウムを添加することにより水酸化アルミニウム中のＣａＯ濃度を低下させることを特徴とする水酸化アルミニウムの製造方法。An alumina-containing ore and an alkali solution are mixed, the mixture is heated, and the alumina content in the ore is dissolved in the alkali solution to obtain an alkali aluminate solution. Further, a flocculant is added to the mixture to remove the undissolved content. A method for producing aluminum hydroxide, comprising a separation step of settling and a step of precipitating aluminum hydroxide from an alkali aluminate solution which is the supernatant liquid, by adding calcium aluminate to the flocculant in the separation step A method for producing aluminum hydroxide, comprising reducing the CaO concentration in aluminum hydroxide. アルミナ含有鉱石とアルカリ溶液とを混合し、該混合物を加熱処理して鉱石中のアルミナ分をアルカリ溶液中に溶解させアルミン酸アルカリ溶液とし、さらに該混合物に凝集剤を添加して未溶解分を沈降させる分離工程と、分離工程後で水酸化アルミニウムを析出させる工程の前に、アルミン酸アルカリ溶液に濾過助剤を加えてアルミン酸アルカリ溶液を濾過する工程を含み、この濾液であるアルミン酸アルカリ溶液から水酸化アルミニウムを析出させる水酸化アルミニウムの製造方法であって、前記分離工程の凝集剤にアルミン酸カルシウムを添加するとともに、前記濾過工程の濾過助剤にアルミン酸カルシウムを添加することにより水酸化アルミニウム中のＣａＯ濃度を低下させることを特徴とする水酸化アルミニウムの製造方法。An alumina-containing ore and an alkali solution are mixed, the mixture is heated, and the alumina content in the ore is dissolved in the alkali solution to obtain an alkali aluminate solution. Further, a flocculant is added to the mixture to remove the undissolved content. A step of adding a filter aid to the alkali aluminate solution and filtering the alkali aluminate solution before the step of precipitating and the step of precipitating aluminum hydroxide after the separation step. A method of producing aluminum hydroxide for precipitating aluminum hydroxide from a solution, wherein calcium aluminate is added to the flocculant in the separation step, and water is added by adding calcium aluminate to the filter aid in the filtration step. A method for producing aluminum hydroxide, comprising reducing the CaO concentration in aluminum oxide. アルミン酸カルシウムを、アルミン酸アルカリ溶液とカルシウム含有物から合成することを特徴とする請求項１〜３のいずれか１項に記載の水酸化アルミニウムの製造方法。The method for producing aluminum hydroxide according to any one of claims 1 to 3 , wherein the calcium aluminate is synthesized from an alkali aluminate solution and a calcium-containing material. アルミン酸カルシウムを、アルミン酸アルカリ溶液とカルシウム含有物および水酸化ナトリウムから合成することを特徴とする請求項１〜３のいずれか１項に記載の水酸化アルミニウムの製造方法。The method for producing aluminum hydroxide according to any one of claims 1 to 3 , wherein the calcium aluminate is synthesized from an alkali aluminate solution, a calcium-containing material, and sodium hydroxide. アルミン酸カルシウム中のフリーな水酸化ナトリウム濃度が、１１０ｇ／リットル〜２００ｇ／リットルの範囲内であることを特徴とする請求項５に記載の水酸化アルミニウムの製造方法。6. The method for producing aluminum hydroxide according to claim 5, wherein the concentration of free sodium hydroxide in the calcium aluminate is in the range of 110 g / liter to 200 g / liter. カルシウム含有物が、スラリー化した消石灰であることを特徴とする請求項４〜６の何れか１項に記載の水酸化アルミニウムの製造方法。The method for producing aluminum hydroxide according to any one of claims 4 to 6, wherein the calcium-containing material is slurried slaked lime. アルミン酸アルカリ溶液がアルミン酸ナトリウム溶液であることを特徴とする請求項４〜７の何れか１項に記載の水酸化アルミニウムの製造方法。The method for producing aluminum hydroxide according to any one of claims 4 to 7, wherein the alkali aluminate solution is a sodium aluminate solution. カルシウム含有物のＣａＯ換算モル量をＡ、アルミン酸アルカリ溶液のＡｌ2Ｏ3換算モル量をＢとした場合、ＡのＢに対する比率（Ａ／Ｂ）を、１／５〜３の範囲内としてアルミン酸カルシウムを合成することを特徴とする請求項４〜８の何れか１項に記載の水酸化アルミニウムの製造方法。When the CaO equivalent molar amount of the calcium-containing material is A and the Al 2 O 3 equivalent molar amount of the alkali aluminate solution is B, the ratio of A to B (A / B) is in the range of 1 / 5-3. The method for producing aluminum hydroxide according to any one of claims 4 to 8, wherein calcium aluminate is synthesized. アルミン酸カルシウムの合成を、８０℃〜１００℃の範囲内で行うことを特徴とする請求項４〜９の何れか１項に記載の水酸化アルミニウムの製造方法。The method for producing aluminum hydroxide according to any one of claims 4 to 9, wherein the synthesis of calcium aluminate is performed within a range of 80 ° C to 100 ° C. アルミン酸カルシウム中のＣＯ2濃度が５質量％以下であることを特徴とする請求項１〜１０の何れか１項に記載の水酸化アルミニウムの製造方法。The method for producing aluminum hydroxide according to any one of claims 1 to 10, wherein the concentration of CO 2 in the calcium aluminate is 5% by mass or less. 濾過工程におけるアルミン酸カルシウム添加量を、アルミナ含有鉱石の溶解に用いたアルカリ溶液に対する添加量で、２００ｍｇ／リットル〜１０００ｍｇ／リットルの範囲内で添加することを特徴とする請求項１および請求項３〜１０の何れか１項に記載の水酸化アルミニウムの製造方法。The calcium aluminate addition amount in the filtration step is an addition amount with respect to the alkaline solution used for dissolving the alumina-containing ore, and is added within a range of 200 mg / liter to 1000 mg / liter. The manufacturing method of the aluminum hydroxide of any one of 10-10. 分離工程におけるアルミン酸カルシウム添加量を、アルミナ含有鉱石の溶解に用いたアルカリ溶液に対する添加量で、１００ｍｇ／リットル〜４００ｍｇ／リットルの範囲内で添加とすることを特徴とする請求項２および請求項３〜１０の何れか１項に記載の水酸化アルミニウムの製造方法。The calcium aluminate addition amount in the separation step is an addition amount with respect to the alkaline solution used for dissolving the alumina-containing ore, and is added within a range of 100 mg / liter to 400 mg / liter. The method for producing aluminum hydroxide according to any one of 3 to 10. 水酸化アルミニウムを析出させる工程でのアルカリ溶液中のカルシウム濃度を、ＣａＯ換算で１５ｍｇ／リットル以下にすることを特徴とする請求項１〜１３の何れか１項に記載の水酸化アルミニウムの製造方法。The method for producing aluminum hydroxide according to any one of claims 1 to 13, wherein the calcium concentration in the alkaline solution in the step of depositing aluminum hydroxide is 15 mg / liter or less in terms of CaO. . 水酸化アルミニウム中のＣａＯ含有量を２００ｐｐｍ以下にすることを特徴とする請求項１〜１４の何れか１項に記載の水酸化アルミニウムの製造方法。The method for producing aluminum hydroxide according to any one of claims 1 to 14, wherein the content of CaO in the aluminum hydroxide is 200 ppm or less. アルミナ含有鉱石として、ＣａＯ含有量が０．５質量％〜１０重量％の範囲内の鉱石を用いることを特徴とする請求項１〜１５の何れか１項に記載の水酸化アルミニウムの製造方法。The method for producing aluminum hydroxide according to any one of claims 1 to 15, wherein an ore having a CaO content in a range of 0.5 mass% to 10 wt% is used as the alumina-containing ore. 請求項１〜１６の何れか１項に記載の水酸化アルミニウムの製造方法で製造した水酸化アルミニウム。 Aluminum hydroxide manufactured with the manufacturing method of aluminum hydroxide given in any 1 paragraph of Claims 1-16.
JP2001396220A 2001-12-27 2001-12-27 Method for producing aluminum hydroxide Expired - Lifetime JP4108974B2 (en)

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JP2003192340A JP2003192340A (en) 2003-07-09
JP2003192340A5 true JP2003192340A5 (en) 2005-06-02
JP4108974B2 JP4108974B2 (en) 2008-06-25

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RU2389682C2 (en) * 2007-04-03 2010-05-20 Пингсхуо Индастриал ЛТД. Method of reducing silica and alumina from volatle coal ash
CN103214013B (en) * 2013-04-27 2015-08-05 昆明冶金研究院 A kind of preparation method of high purity alumina powder

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