JPH06171929A - Production of white aluminum hydroxide - Google Patents
Production of white aluminum hydroxideInfo
- Publication number
- JPH06171929A JPH06171929A JP4323030A JP32303092A JPH06171929A JP H06171929 A JPH06171929 A JP H06171929A JP 4323030 A JP4323030 A JP 4323030A JP 32303092 A JP32303092 A JP 32303092A JP H06171929 A JPH06171929 A JP H06171929A
- Authority
- JP
- Japan
- Prior art keywords
- aluminum hydroxide
- hypochlorite
- solution
- sodium aluminate
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
- C01F7/141—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はアルミン酸ナトリウム溶
液からの白色水酸化アルミニウムの製造方法に関する。
更に詳細にはアルミン酸ナトリウム溶液を特定物質で処
理することにより、特別の装置を用いることなく、かつ
経済的に高度な白色水酸化アルミニウムの製造方法に関
するものである。FIELD OF THE INVENTION The present invention relates to a method for producing white aluminum hydroxide from a sodium aluminate solution.
More specifically, it relates to a method for producing white aluminum hydroxide which is economically advanced by treating a sodium aluminate solution with a specific substance without using a special apparatus.
【０００２】[0002]
【従来の技術】一般にバイヤ−プロセスは、ボ−キサイ
ト等のアルミナ含有鉱石をカセイソ−ダ溶液中で加熱し
該鉱石中のアルミナ分をアルミン酸ナトリウムとしてア
ルカリ液中に抽出し、不溶分である酸化鉄、硅酸塩、酸
化チタン等を分離し、清澄なアルミン酸ナトリウム溶液
を得た後、該溶液に種子水酸化アルミニウムを添加し、
水酸化アルミニウムを析出させると共に、該水酸化アル
ミニウムを析出させた後のアルミン酸ナトリウム溶液
は、そのまま、或いは加熱濃縮した後、再度アルミナ含
有鉱石からのアルミナ分抽出溶液として循環使用され
る。2. Description of the Related Art In general, the viar process is an insoluble matter obtained by heating an alumina-containing ore such as bauxite in a caseisodal solution and extracting the alumina content of the ore as sodium aluminate into an alkaline solution. After separating iron oxide, silicate, titanium oxide, etc., to obtain a clear sodium aluminate solution, seed aluminum hydroxide is added to the solution,
Along with the precipitation of aluminum hydroxide, the sodium aluminate solution after the precipitation of aluminum hydroxide is reused as it is or after being concentrated by heating again as a solution for extracting the alumina component from the alumina-containing ore.
【０００３】通常、アルミナ含有鉱石中にはフミン質を
主体とする有機物が含まれており、これらはボ−キサイ
トをアルカリ処理する際に液中に溶出する。バイヤ−法
においては上記したようにアルカリ液は循環使用される
ので、有機物は液中に蓄積され液中濃度は増加してく
る。これら有機物の中には着色成分が含まれているため
液中有機物濃度が増加するに伴い析出する水酸化アルミ
ニウムに付着し白色度を低下せしめる。Usually, the alumina-containing ore contains organic substances mainly composed of humic substances, and these are eluted in the liquid when the bauxite is treated with alkali. In the Bayer method, since the alkaline liquid is circulated and used as described above, organic substances are accumulated in the liquid and the concentration in the liquid increases. Since these organic substances contain a coloring component, they adhere to aluminum hydroxide which is deposited as the concentration of organic substances in the liquid increases, thereby reducing the whiteness.
【０００４】該有機物による水酸化アルミニウムの着色
は、該水酸化アルミニウムを焼成しアルミナとした後使
用するセラミックス原料粉体としての用途に於いては特
に問題とはならないものの、浄水用硫酸アルミニウム等
の原料としては、該製品硫酸アルミニウムの着色が嫌わ
れることより、従来より水酸化アルミニウムの析出に際
し予め該アルミン酸ナトリウム溶液中の有機物を酸化、
或いは吸着剤で吸着することにより、溶液中の有機物濃
度を所望濃度まで低減させ、操業を実施している。Although the coloring of aluminum hydroxide by the organic matter does not cause any particular problem in the use as a ceramic raw material powder to be used after firing the aluminum hydroxide into alumina, aluminum sulfate for water purification, etc. As a raw material, since the product aluminum sulfate is disliked in color, conventionally, when precipitating aluminum hydroxide, the organic matter in the sodium aluminate solution is previously oxidized,
Alternatively, by adsorbing with an adsorbent, the concentration of organic substances in the solution is reduced to a desired concentration and the operation is carried out.
【０００５】このようなアルミン酸ナトリウム溶液より
の有機物の除去方法としては、加圧酸素ガスを用いて
有機物を蓚酸塩に転換除去する方法（特公昭４５−３０
４５８）酸素の存在下で光化学反応により有機物を酸
化分解する方法（特開昭４９−２００９７）、溶液を
濃縮または冷却する等の手段により有機物の溶解度を下
げ、析出分離する方法（特開昭４８−７９１９８）、
アルミン酸ナトリウム溶液にＭｇおよびＣａの酸化物、
水酸化物、炭酸塩、硅酸塩、蓚酸塩等を添加し有機物を
除去する方法（特公昭５７−３１５２７）、アルミン
酸ナトリウム溶液に塩水マッドと接触させ有機物を吸着
除去する方法（特開昭５９−１０２８１９）、或いは
アルミン酸ナトリウム溶液中に過酸化水素、過酸化ナト
リウムを添加し有機物を酸化分解する方法（特公昭５８
−４６４５１）等が知られている。As a method for removing the organic matter from the sodium aluminate solution, a method of converting the organic matter into an oxalate by using pressurized oxygen gas (Japanese Patent Publication No. 45-30).
458) A method of oxidatively decomposing an organic substance by a photochemical reaction in the presence of oxygen (JP-A-49-20097), a method of decreasing the solubility of the organic substance by means such as concentrating or cooling the solution, and precipitating separation (JP-A-48) -79198),
Mg and Ca oxides in sodium aluminate solution,
A method for removing organic substances by adding hydroxide, carbonate, silicate, oxalate or the like (Japanese Patent Publication No. 57-31527), and a method for adsorbing and removing organic substances by bringing a sodium aluminate solution into contact with salt water mud (Japanese Patent Laid-Open Publication No. 59-102819) or a method of oxidatively decomposing organic matter by adding hydrogen peroxide or sodium peroxide to a sodium aluminate solution (Japanese Patent Publication No. S58-58).
-46451) and the like are known.
【０００６】また最近では人工大理石や不燃性壁紙用の
白色樹脂成形品フィラ−、紙フィラ−等の用途に、より
高度な白色度の高い水酸化アルミニウムの需要が増大し
ている。かかる用途に於いては上記バイヤー法のアルミ
ン酸ナトリウム溶液を高度に精製処理した後、この溶液
より水酸化アルミニウムを得る方法、或いはアルカリ溶
液に水酸化アルミニウム或いはアルミニウムを溶解しア
ルミン酸ナトリウム溶液とした後、該溶液を上記公知方
法で有機物の除去処理をし、次いで種子水酸化アルミニ
ウムを添加して得た水酸化アルミニウムが使用されてい
る。[0006] Recently, there has been an increasing demand for aluminum hydroxide having a higher degree of whiteness for applications such as fillers for white resin moldings for artificial marble and non-combustible wallpaper, paper fillers and the like. In such applications, a method of highly purifying the sodium aluminate solution of the Bayer method and then obtaining aluminum hydroxide from this solution, or dissolving aluminum hydroxide or aluminum in an alkaline solution to obtain a sodium aluminate solution After that, aluminum hydroxide obtained by treating the solution with an organic substance by the above-mentioned known method and then adding seed aluminum hydroxide is used.
【０００７】[0007]
【発明が解決しようとする課題】しかし、上記公知の有
機物質の処理方法に於いては製品水酸化アルミニウムの
着色度を効率よく低下させるには不十分であった。例え
ば、等の湿式酸化法においては、液中の有機物は非
選択的に酸化されるためか、白色樹脂成形品フィラ−、
紙フィラ−等の高度な白色度の高い水酸化アルミニウム
の用途に於いては所望とする白色度の高い水酸化アルミ
ニウムを得る為には溶液中の有機物の大部分が酸化分解
されるまで酸化を行わねばならず、多大な費用を要し経
済的でない。の液を濃縮、冷却する方法に於いては、
該処理後の溶液より得られる水酸化アルミニウムの白色
効果が低い。However, the above-mentioned known methods for treating organic substances are insufficient to efficiently reduce the coloring degree of aluminum hydroxide as a product. For example, in the wet oxidation method such as, because the organic matter in the liquid is non-selectively oxidized, the white resin molded product filler,
In the application of aluminum hydroxide having a high degree of whiteness such as paper filler, in order to obtain the desired aluminum hydroxide having a high degree of whiteness, most of the organic substances in the solution are oxidized until they are oxidized and decomposed. It has to be done, is expensive and not economical. In the method of concentrating and cooling the liquid of
The white effect of aluminum hydroxide obtained from the solution after the treatment is low.
【０００８】また、液中の着色有機物の吸着除去を目的
とした、のＭｇ塩や塩水マッドを用いる方法では、
ある程度の効果は得られるが、着色有機物の全てに効率
良く作用するわけではなく一部の着色有機物を除去する
にはかなりの添加量を要し必ずしも満足の行くものでは
ない。さらに、の過酸化水素や過酸化ナトリウムを添
加する方法は、の湿式酸化方法と同様、着色物質に
対する選択効果が低いためか、高白色度の水酸化アルミ
ニウムを目的とする場合には溶液中に含有される有機物
の略全量を酸化分解しなければならず、このため多量の
過酸化物量を必要とするため経済的でない。Further, in the method using Mg salt or salt water mud for the purpose of adsorbing and removing the colored organic matter in the liquid,
Although some effects can be obtained, it does not act efficiently on all of the colored organic substances, and a considerable amount of addition is required to remove some of the colored organic substances, which is not always satisfactory. Furthermore, the method of adding hydrogen peroxide or sodium peroxide is similar to the wet oxidation method of, probably because the selection effect on the coloring substance is low, and when aluminum hydroxide of high whiteness is intended, it is added to the solution. It is uneconomical because almost all of the contained organic matter has to be oxidatively decomposed, which requires a large amount of peroxide.
【０００９】かかる事情下に於いて、本発明者らは、特
別の装置を用いることなく、かつ経済的に高度な白色水
酸化アルミニウムを得る方法を見いだすべく鋭意検討し
た結果、着色溶液の処理に次亜塩素酸、次亜塩素酸塩ま
たはこれら含有物質を使用する場合には、該溶液中に含
まれる有機物質を全て酸化分解する量を添加することな
く、極めて少量を添加するのみで着色物質に対する選択
除去効果があることを見いだし、本発明を完成するに至
った。Under these circumstances, the inventors of the present invention have made earnest studies to find a method of obtaining white aluminum hydroxide that is economical and highly efficient without using a special device. When using hypochlorous acid, hypochlorite or a substance containing these, a coloring substance is added only by adding a very small amount without adding an amount that oxidatively decomposes all the organic substances contained in the solution. The inventors have found that there is a selective removal effect against, and have completed the present invention.
【００１０】[0010]
【課題を解決するための手段】すなわち本発明は鉄或い
は鉄化合物の含有量が１０ｐｐｍ以下であり、且つ色差
計で測定したｂ値が１以上のアルミン酸ナトリウム溶液
を、次亜塩素酸、次亜塩素酸塩またはこれらを含む物質
の少なくとも１種で処理した後、種子水酸化アルミニウ
ムを添加し水酸化アルミニウムを得ることを特徴とする
白色水酸化アルミニウムの製造方法を提供するにある。[Means for Solving the Problems] That is, the present invention provides a solution of sodium aluminate having an iron or iron compound content of 10 ppm or less and a b value of 1 or more measured by a color difference meter, with hypochlorous acid, Another object of the present invention is to provide a method for producing white aluminum hydroxide, which comprises treating seed chlorite or at least one of substances containing them and then adding seed aluminum hydroxide to obtain aluminum hydroxide.
【００１１】以下、本発明方法を詳細に説明する。本発
明の対象とするアルミン酸ナトリウム溶液は色差計で測
定したｂ値が１以上の有機物による着色を有するもので
ある。該溶液の着色にはボーキサイト中の有機物のみな
らず、酸化鉄に起因する場合もあり、溶液中に金属換算
で１５ｐｐｍを越える鉄或いは鉄化合物が存在する場合
には視覚で赤系の着色を感じるので、本発明が対象とす
るアルミン酸ナトリウム溶液の範囲外とした。The method of the present invention will be described in detail below. The sodium aluminate solution which is the object of the present invention is colored by an organic substance having ab value of 1 or more measured by a color difference meter. The coloring of the solution may be caused not only by the organic substances in the bauxite but also by iron oxide. When iron or iron compound exceeding 15 ppm in terms of metal is present in the solution, a reddish color is visually perceived. Therefore, it was outside the range of the sodium aluminate solution targeted by the present invention.
【００１２】該アルミン酸ナトリウム溶液は、上記条件
を満足するものであれば特にその溶液中のアルカリ濃
度、或いはアルミナ濃度に等に制限されるものではな
く、通常バイヤ−法に於けるアルミン酸ナトリウム溶
液、或いはアルカリ溶液に水酸化アルミニウムを溶解さ
せて得られる合成アルミン酸ナトリウム溶液、更にはＡ
ｌメタルとアルカリ溶液よりの合成アルミン酸ナトリウ
ム溶液等が用いられる。The sodium aluminate solution is not particularly limited to the alkali concentration or the alumina concentration in the solution as long as it satisfies the above-mentioned conditions, and sodium aluminate solution according to the Bayer method is usually used. Solution or a synthetic sodium aluminate solution obtained by dissolving aluminum hydroxide in an alkaline solution, and further A
A synthetic sodium aluminate solution of 1 metal and an alkaline solution or the like is used.
【００１３】本発明に用いられる次亜塩素酸または次亜
塩素酸塩は特に限定されるものではない。次亜塩素酸塩
としては一般には、次亜塩素酸ソ−ダ、次亜塩素酸カル
シウム、次亜塩素酸カリウム等を用いることができる。
また次亜塩素酸或いは次亜塩素酸塩はこれら単独は勿
論、これらを含有する物質、例えばさらし粉、さらし
液、高度さらし粉等を用いることができる。The hypochlorous acid or hypochlorite used in the present invention is not particularly limited. As the hypochlorite, sodium hypochlorite, calcium hypochlorite, potassium hypochlorite and the like can be generally used.
Further, hypochlorous acid or hypochlorite can be used not only as a single substance but also as a substance containing them, for example, bleaching powder, bleaching solution, highly bleaching powder and the like.
【００１４】アルミン酸ナトリウム溶液の次亜塩素酸、
次亜塩素酸塩またはこれら含有物質による処理方法は該
溶液に次亜塩素酸、次亜塩素酸塩またはこれら含有物質
を接触せしめればよく、製品水酸化アルミニウムを得る
前に処理が完了していれば作用方法については特に限定
されるものではない。普通には次亜塩素酸、次亜塩素酸
塩またはこれら含有物質を液体、或いは粉体で添加する
方法が使用される。Hypochlorous acid in a sodium aluminate solution,
The treatment method with hypochlorite or a substance containing these may be performed by contacting the solution with hypochlorous acid, hypochlorite or a substance containing these, and the treatment is completed before obtaining the product aluminum hydroxide. If so, the method of operation is not particularly limited. Usually, a method of adding hypochlorous acid, hypochlorite or a substance containing them in liquid or powder form is used.
【００１５】これら次亜塩素酸、次亜塩素酸塩或いはこ
れらの含有物質の添加量はアルミン酸ナトリウム溶液中
に存在する有機物量に比し少量で良く、該溶液中の有機
物の全炭素量を二酸化炭素までの酸化に必要な理論量の
約０、５重量％〜約５０重量％、普通には０．５重量％
〜約１５重量％で十分な効果が得られる。これ以上の添
加量でも本発明の目的の効果を得るには何等支障はない
が、経済性の点から上記添加量で充分である。他方添加
量が上記範囲未満の場合には脱色効果は低くなる。The amount of the hypochlorous acid, the hypochlorite or the substances containing them added may be small as compared with the amount of the organic substances present in the sodium aluminate solution, and the total carbon amount of the organic substances in the solution is About 0,5% to about 50% by weight of the theoretical amount required for oxidation to carbon dioxide, usually 0.5% by weight
A sufficient effect can be obtained at about 15% by weight. If the amount added is more than this, there is no problem in obtaining the effects of the present invention, but the above amount is sufficient from the economical point of view. On the other hand, when the addition amount is less than the above range, the decolorizing effect is low.
【００１６】また本発明は従来知られている技術と組み
合わせて用いることもできる。その際には従来の技術で
得られる効果と本発明で得られる効果の区別は明確では
ないが、本発明による効率的な着色有機物除去法により
従来法の有機物除去量に対する割合を低減させることが
できる。本発明においては次亜塩素酸塩として、例えば
次亜塩素酸カルシウムを用いる場合にはアルミン酸カル
シウム等の反応物質が生成する。これらの生成物が後工
程に支障をきたす場合は通常知られている方法により濾
過除去すれば良い。The present invention can also be used in combination with conventionally known techniques. In that case, the distinction between the effect obtained by the conventional technique and the effect obtained by the present invention is not clear, but it is possible to reduce the ratio to the organic substance removal amount of the conventional method by the efficient colored organic substance removal method of the present invention. it can. In the present invention, as the hypochlorite, for example, when calcium hypochlorite is used, a reaction substance such as calcium aluminate is produced. When these products interfere with the subsequent steps, they may be removed by filtration by a generally known method.
【００１７】本発明方法に於いてアルミン酸ナトリウム
溶液の処理は製品水酸化アルミニウムが要求される白色
度にもよるが、通常、本発明に規定する測定法での水酸
化アルミニウム粉末のｂ値で４以下、普通には３以下、
好ましくは２以下まで処理すればよく、これらは本発明
に規定する処理剤の添加量により調節することが可能で
ある。In the method of the present invention, the treatment of the sodium aluminate solution depends on the whiteness required for the product aluminum hydroxide, but it is usually the b value of the aluminum hydroxide powder in the measuring method specified in the present invention. 4 or less, usually 3 or less,
It is preferable to treat up to 2 or less, and these can be adjusted by the addition amount of the treating agent specified in the present invention.
【００１８】[0018]
【作用】本発明において次亜塩素酸または次亜塩素酸塩
を含む塩の作用については、詳らかではないが、一般に
次亜塩素酸や次亜塩素酸塩は液中で分解し活性な酸素お
よび塩素を発生するとされており、本発明においても活
性な酸素及び塩素により液中の着色有機物選択性を持っ
て効率よく酸化分解するものと推定される。液中の着色
有機物に選択性を持ち、効率よく作用していることは、
添加前後で液中の有機炭素量がほとんど変化しない場合
にあっても、色差計で測定したｂ値の低下効果から明ら
かである。In the present invention, the action of the salt containing hypochlorous acid or hypochlorite is not known, but generally, hypochlorous acid and hypochlorite are decomposed in a liquid to give active oxygen and Chlorine is said to be generated, and it is presumed that active oxygen and chlorine are also used in the present invention to efficiently oxidatively decompose the colored organic matter in the liquid with selectivity. It has selectivity for colored organic matter in the liquid and it works efficiently
Even if the amount of organic carbon in the liquid hardly changes before and after the addition, it is clear from the effect of decreasing the b value measured by a color difference meter.
【００１９】[0019]
【発明の効果】以上詳述したように本発明方法は、特別
の装置を用いることなく、単にアルミン酸ナトリウム溶
液に少量の次亜塩素酸または次亜塩素酸塩を添加、接触
せしめるという簡便かつ経済的な方法で高度な白色水酸
化アルミニウムが得られるものであり、その産業上の効
果は頗る大である。As described in detail above, the method of the present invention is simple and simple in that a small amount of hypochlorous acid or hypochlorite is added to and brought into contact with a sodium aluminate solution without using a special apparatus. It is an economical method to obtain high-grade white aluminum hydroxide, and its industrial effect is great.
【００２０】[0020]
【実施例】以下に本発明の実施例を示すが、本発明はこ
れに限定されるものではない。尚、本発明に於いて色度
（ｂ値）は以下の方法により測定した。 水酸化アルミニウム粉末のｂ値測定方法：日本電色工業
株式会社のＮＤ−１００１ＤＰ型デジタル色差計を用い
３０ｍｍφのセルに粉体を充填した後５０回タップし反
射光にてｂ値を測定した。 アルミン酸ナトリウム溶液のｂ値測定方法：日本電色工
業株式会社のＮＤ−１００１ＤＰ型デジタル色差計を用
い試料を３０ｍｍφの透過光にてｂ値を測定した。EXAMPLES Examples of the present invention will be shown below, but the present invention is not limited thereto. In the present invention, the chromaticity (b value) was measured by the following method. Method for measuring b value of aluminum hydroxide powder: A ND-1001DP type digital color difference meter manufactured by Nippon Denshoku Industries Co., Ltd. was used to fill a 30 mmφ cell with the powder, and tapped 50 times to measure the b value by reflected light. Method for measuring b-value of sodium aluminate solution: The b-value of the sample was measured with transmitted light of 30 mmφ using ND-1001DP type digital color difference meter manufactured by Nippon Denshoku Industries Co., Ltd.
【００２１】実施例１〜４ バイヤ−工程で得られたアルミン酸ナトリウム液（溶液
中の全有機物含有量１０ｇ／ｌ）に表１に示す次亜塩素
酸Ｎａ（有効塩素１０％）、さらし粉（有効塩素３０
％）、高度さらし粉（有効塩素６０％）を添加、攪拌し
た後、析出した反応生成物を濾過し、次いで該溶液に種
子水酸化アルミニウムを１．８ｇ／ｌ添加し６０℃、７
２時間、水酸化アルミニウムを晶析させた。次亜塩素酸
塩及びこれを含有する物質添加前後の液の透過率を分光
光度計（４６０ｎｍ）にて測定した。また水酸化アルミ
ニウムの着色度を色差計にてｂ値（黄色味）を測定し
た。その結果を表１に示す。Examples 1 to 4 Sodium aluminate solution (total organic matter content in the solution was 10 g / l) obtained in the viar process, Na hypochlorite (effective chlorine 10%) shown in Table 1 and bleaching powder ( Effective chlorine 30
%), High-grade bleaching powder (effective chlorine 60%), and stirred, and then the precipitated reaction product is filtered, and then 1.8 g / l of seed aluminum hydroxide is added to the solution, and the mixture is added at 60 ° C., 7
Aluminum hydroxide was crystallized for 2 hours. The transmittance of the liquid before and after the addition of hypochlorite and a substance containing the same was measured with a spectrophotometer (460 nm). Further, the b value (yellowness) of the degree of coloring of aluminum hydroxide was measured with a color difference meter. The results are shown in Table 1.
【００２２】[0022]
【表１】 [Table 1]
【００２３】実施例５〜７ バイヤ−工程で得られたアルミン酸ナトリウム溶液を塩
水マッドと接触し濾過することで着色有機物を一部除去
した処理液（溶液中の全有機物含有量０．０６ｇ／ｌ）
に、表２に示す表１で用いたと同じ処理剤を添加後濾過
した。当該液に種水酸化アルミニウムを１．８ｇ／ｌ添
加し水酸化アルミニウムを実施例１〜４と同様に晶析さ
せた。添加前後の液の着色度及び水酸化アルミニウムの
着色度を色差計にて測定た。その結果を表２に示す。Examples 5 to 7 Treatment solutions obtained by contacting the sodium aluminate solution obtained in the buyer step with brine mud and filtering to remove some of the colored organic matter (total organic matter content in the solution: 0.06 g / l)
Then, the same treatment agent as used in Table 1 shown in Table 2 was added and then filtered. 1.8 g / l of seed aluminum hydroxide was added to the liquid, and aluminum hydroxide was crystallized in the same manner as in Examples 1 to 4. The coloring degree of the liquid before and after the addition and the coloring degree of aluminum hydroxide were measured with a color difference meter. The results are shown in Table 2.
【００２４】[0024]
【表２】 [Table 2]
Claims (3)
下であり、かつ色差計で測定したｂ値が１以上のアルミ
ン酸ナトリウム溶液を、次亜塩素酸、次亜塩素酸塩また
はこれらを含む物質の少なくとも１種で処理した後、種
子水酸化アルミニウムを添加し水酸化アルミニウムを得
ることを特徴とする白色水酸化アルミニウムの製造方
法。1. A sodium aluminate solution having an iron or iron compound content of 10 ppm or less and a b value of 1 or more measured by a color difference meter, containing hypochlorous acid, hypochlorite, or these. Process for producing white aluminum hydroxide, characterized in that after treatment with at least one of the substances, seed aluminum hydroxide is added to obtain aluminum hydroxide.
亜塩素酸カルシウム及び次亜塩素酸カリウムの少なくと
も１種であることを特徴とする請求項１記載の白色水酸
化アルミニウムの製造方法。2. The production of white aluminum hydroxide according to claim 1, wherein the hypochlorite is at least one of sodium hypochlorite, calcium hypochlorite and potassium hypochlorite. Method.
次亜塩素酸、次亜塩素酸塩またはこれらを含む物質の量
が該溶液中に含有される有機物の全炭素量を二酸化炭素
まで酸化するに必要な理論量の０．５〜１５重量％であ
ることを特徴とする請求項１記載の白色水酸化アルミニ
ウムの製造方法。3. The amount of hypochlorous acid, hypochlorite or a substance containing them, which is subjected to the treatment of a sodium aluminate solution, is sufficient to oxidize the total carbon amount of the organic matter contained in the solution to carbon dioxide. The method for producing white aluminum hydroxide according to claim 1, wherein the amount is 0.5 to 15% by weight of the required theoretical amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32303092A JP3382648B2 (en) | 1992-12-02 | 1992-12-02 | Method for producing white aluminum hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32303092A JP3382648B2 (en) | 1992-12-02 | 1992-12-02 | Method for producing white aluminum hydroxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06171929A true JPH06171929A (en) | 1994-06-21 |
| JP3382648B2 JP3382648B2 (en) | 2003-03-04 |
Family
ID=18150336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32303092A Expired - Fee Related JP3382648B2 (en) | 1992-12-02 | 1992-12-02 | Method for producing white aluminum hydroxide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3382648B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008019158A (en) * | 2006-06-14 | 2008-01-31 | Hiroko Ishikuri | Method for producing high purity aluminum hydroxide and high purity aluminum hydroxide obtained by the method |
| CN104140118A (en) * | 2013-05-06 | 2014-11-12 | 重庆任丙科技有限公司 | A producing method of high-purity aluminium oxide |
| CN105776269A (en) * | 2016-03-24 | 2016-07-20 | 中国铝业股份有限公司 | Micro-powder aluminum hydroxide preparation method and device and micro-powder aluminum hydroxide |
| CN106082294A (en) * | 2016-08-01 | 2016-11-09 | 刘冠华 | Aluminium hydroxide is dried conveyer device and the method for conveying aluminium hydroxide |
-
1992
- 1992-12-02 JP JP32303092A patent/JP3382648B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008019158A (en) * | 2006-06-14 | 2008-01-31 | Hiroko Ishikuri | Method for producing high purity aluminum hydroxide and high purity aluminum hydroxide obtained by the method |
| CN104140118A (en) * | 2013-05-06 | 2014-11-12 | 重庆任丙科技有限公司 | A producing method of high-purity aluminium oxide |
| CN105776269A (en) * | 2016-03-24 | 2016-07-20 | 中国铝业股份有限公司 | Micro-powder aluminum hydroxide preparation method and device and micro-powder aluminum hydroxide |
| CN106082294A (en) * | 2016-08-01 | 2016-11-09 | 刘冠华 | Aluminium hydroxide is dried conveyer device and the method for conveying aluminium hydroxide |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3382648B2 (en) | 2003-03-04 |
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