JPH02188424A - Production of aluminum hydroxide low in iron content - Google Patents
Production of aluminum hydroxide low in iron contentInfo
- Publication number
- JPH02188424A JPH02188424A JP1009077A JP907789A JPH02188424A JP H02188424 A JPH02188424 A JP H02188424A JP 1009077 A JP1009077 A JP 1009077A JP 907789 A JP907789 A JP 907789A JP H02188424 A JPH02188424 A JP H02188424A
- Authority
- JP
- Japan
- Prior art keywords
- iron
- voltage
- tank
- aluminum hydroxide
- bayer
- 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.)
- Pending
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 46
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 6
- 238000001556 precipitation Methods 0.000 claims description 3
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 abstract description 14
- 229910001388 sodium aluminate Inorganic materials 0.000 abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005868 electrolysis reaction Methods 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010439 graphite Substances 0.000 abstract description 2
- 229910002804 graphite Inorganic materials 0.000 abstract description 2
- 239000001257 hydrogen Substances 0.000 abstract description 2
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 2
- 230000008021 deposition Effects 0.000 abstract 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 239000000243 solution Substances 0.000 description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 150000002894 organic compounds Chemical class 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004131 Bayer process Methods 0.000 description 3
- 150000001341 alkaline earth metal compounds Chemical class 0.000 description 3
- 150000002506 iron compounds Chemical class 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000004993 emission spectroscopy Methods 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 150000002484 inorganic compounds Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002928 artificial marble Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- -1 platinum group metals Chemical class 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 229940034610 toothpaste Drugs 0.000 description 1
- 239000000606 toothpaste Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
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
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
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
【発明の詳細な説明】
［産業上の利用分野］
本発明は、鉄含有量の少ない水酸化アルミニウム、特に
人造大理石用途のフィラー、ハミガキ用基材、光学ガラ
スの原料等の高い白色度又は鉄含有量が少ないことを要
求される分野に使用される水酸化アルミニウムの製造法
に関する。Detailed Description of the Invention [Industrial Field of Application] The present invention is applicable to aluminum hydroxide with low iron content, particularly fillers for artificial marble, toothpaste base materials, raw materials for optical glass, etc., which have high whiteness or iron content. This invention relates to a method for producing aluminum hydroxide used in fields that require a low content.
［従来の技術］
水酸化アルミニウム（以下、水酸化アルミという、）は
、商業的にはボーキサイトを苛性ソーダ溶液で処理して
得られるアルミン酸ソータ溶液に、種子を添加して該溶
液を加水分解させる方法（いわゆるバイヤー法）によっ
て製造されているが、バイヤー工程中のアルミン酸ソー
ダ？ａｉ＊は、無機及び有機化合物からなる着色物質を
相当多量含有しており、これが析出してくる水酸化アル
ミに混入してくるためかなり着色してくる。[Prior Art] Aluminum hydroxide (hereinafter referred to as aluminum hydroxide) is produced commercially by adding seeds to an aluminate sorter solution obtained by treating bauxite with a caustic soda solution and hydrolyzing the solution. Although it is manufactured by the so-called Bayer method, is it sodium aluminate during the Bayer process? ai* contains a considerably large amount of coloring substances made of inorganic and organic compounds, which mix into the precipitated aluminum hydroxide, resulting in considerable coloration.
着色物質のうち有機化合物を除去する方法としては、バ
イヤー液を焼成し、有機物をＣＯ２ガスとして再使用す
る方法（特公昭５７−２０７６号、特公昭５８−４６４
５０号、特公昭５９−５１４８８号）や２発生期の酸素
源をバイヤー液に作用させる方法（特公昭５８−４６４
５１号）、活性炭により吸着除去する方法、アルカリ土
類金属化合物を利用する方法Ｃ特開昭５４−１６３７９
９号）等が開示されている。A method for removing organic compounds among colored substances is to burn Bayer's liquid and reuse the organic compounds as CO2 gas (Japanese Patent Publication No. 57-2076, Japanese Patent Publication No. 58-464).
50, Japanese Patent Publication No. 59-51488) and a method in which an oxygen source in the 2nd generation stage acts on Bayer's solution (Special Publication No. 58-464)
No. 51), method of adsorption and removal with activated carbon, method of using alkaline earth metal compounds C JP-A-54-16379
No. 9) etc. have been disclosed.
また、バイヤー工程中のアルミン酸ソーダ溶液中の無機
着色物質としては、特に鉄化合物が挙げられ、これを除
去する方法としてアルカリ土類金属化合物を添加する方
法（特開昭５４−１６３７９９号、特開昭６０−３６３
２７号）が開示されている。In addition, iron compounds are particularly mentioned as inorganic colored substances in the sodium aluminate solution during the Bayer process, and a method for removing them is a method of adding an alkaline earth metal compound (Japanese Unexamined Patent Publication No. 163799/1989, Kaisho 60-363
No. 27) has been disclosed.
しかし、これらの方法は大きなエネルギーコストを必要
とする、苛性ソーダ、アルミニウム分の損失がある、あ
るいは高価な薬品の添加を要求される等の問題があるう
え、それでも充分に白色度の高い、あるいは鉄分の少な
い水酸化アルミニウムは得られていない。However, these methods have problems such as requiring large energy costs, loss of caustic soda and aluminum content, or requiring the addition of expensive chemicals. Aluminum hydroxide with a small amount of aluminum hydroxide has not been obtained.
［発明が解決しようとする課題］
発明者等は、バイヤー工程中のアルミン酸ソーダ溶液中
の無機及び有機化合物を前記の方法で除去しても、充分
に白色度の高い、あるいは鉄分の少ない水酸化アルミニ
ウムが得られない原因を追求した結果、従来の鉄系金属
はアルカリ性水溶液中では不動態領域にあるという常識
に反して、バイヤータンクの材質である鉄系金属はアル
ミン酸ソーダ溶液により浸され、微量の鉄がアルミン酸
ソーダ溶液へ溶出すること、また溶出した鉄は瞬時に水
酸化アルミニウムに吸着するため、鉄のアルミン酸ソー
ダへの溶解は平衡に達し得す、継続すること、結果とし
て微量の鉄による水酸化アルミニウムの汚染は避は得な
いことを見出した。[Problems to be Solved by the Invention] The inventors have discovered that even if the inorganic and organic compounds in the sodium aluminate solution during the Bayer process are removed by the above method, water with sufficiently high whiteness or low iron content cannot be obtained. As a result of investigating the cause of not being able to obtain aluminum oxide, we found that, contrary to the conventional wisdom that iron-based metals are in the passive region in alkaline aqueous solutions, the iron-based metals that are the material of the Bayer tank are immersed in a sodium aluminate solution. , a trace amount of iron is eluted into the sodium aluminate solution, and the eluted iron is instantly adsorbed to aluminum hydroxide, so the dissolution of iron in the sodium aluminate can reach equilibrium and continue. It was discovered that contamination of aluminum hydroxide by trace amounts of iron is unavoidable.
前述のアルカリ土類金属化合物を添加する方法では、新
たに溶解してくる鉄の除去は不可能である。With the above-mentioned method of adding an alkaline earth metal compound, it is impossible to remove newly dissolved iron.
また、特開昭５８−１６７４２号では、特定のカルボン
酸またはその塩、第３級アミン、多価アルコール等の添
加による鉄の溶出防止を計っているがこれとて効果が充
分とは言えず、さらにバイヤー液中に有機物の蓄積を招
き、別の着色源となる可能性を持っている。Furthermore, in JP-A-58-16742, prevention of iron elution is attempted by adding specific carboxylic acids or their salts, tertiary amines, polyhydric alcohols, etc., but this method cannot be said to be sufficiently effective. Furthermore, it may lead to the accumulation of organic matter in the Bayer liquid, which may become another source of coloration.
このほか、鉄を入れない方法としては、タンク等の材質
をニッケル等のように侵され難い金属製にすることは高
価になり実用的でない。In addition, as a method that does not include iron, it is impractical to make the tank etc. from a metal that is hard to corrode, such as nickel, because it is expensive.
またＦＲＰ、ホーロー、合成樹脂塗装等通常の防食処理
も、濃厚なアルカリ性水溶、液であるアルミン酸ソーダ
に対しては抵抗性がない。Furthermore, ordinary anticorrosive treatments such as FRP, enamel, and synthetic resin coatings have no resistance to concentrated alkaline aqueous solutions or liquid sodium aluminate.
〔課題を解決するための手段Ｊ 本発明は、鉄系金属からなるバイヤー析出槽。[Means to solve the problem J The present invention relates to a Bayer precipitation tank made of iron-based metal.
貯槽及び該槽に浸漬される構造物に負電圧を印加するこ
とにより低鉄水酸化アルミを製造する方法により上記の
問題点を解決したものである。The above problems are solved by a method of producing low-iron aluminum hydroxide by applying a negative voltage to a storage tank and structures immersed in the tank.
バイヤー析出槽、貯槽及びこれらに付設されている撹拌
機、ポンプ、配管等の鉄系金属構造物を負電極とし、不
溶性電極（例えば白金族金属またはそれらの酸化物、グ
ラファイト等）を陽極とし、アルミン酸ソーダ水溶液中
の鉄系金属を陰極として鉄の不活性態領域であって、水
の電解電圧以下の電圧を負荷することによりアルミン酸
ソーダ水溶液中へ溶解する鉄化合物を大幅に低減できる
ことを見出し、本発明に到達した。The Bayer precipitation tank, the storage tank, and the agitators, pumps, piping, and other ferrous metal structures attached to these are used as the negative electrode, and the insoluble electrode (for example, platinum group metals or their oxides, graphite, etc.) is used as the anode, It has been shown that iron compounds dissolved in a sodium aluminate aqueous solution can be significantly reduced by applying a voltage lower than the electrolysis voltage of water to an iron-based inert region using an iron-based metal in a sodium aluminate aqueous solution as a cathode. Heading, we arrived at the present invention.
この場合、電圧が不充分な場合には鉄の溶出量は増大す
るので、充分な電圧をかける必要がある。In this case, if the voltage is insufficient, the amount of iron eluted increases, so it is necessary to apply a sufficient voltage.
しかし、水の電気分解の過電圧を越える電圧は消費電力
を増加して経済的でないばかりでなく、不溶性電極（陽
極）からは酸素が、槽または構造物からは水素が発生し
、危険を伴うので避けるべきである。However, a voltage that exceeds the overvoltage of water electrolysis not only increases power consumption and is not economical, but also generates oxygen from the insoluble electrode (anode) and hydrogen from the tank or structure, which is dangerous. Should be avoided.
本発明によれば、−旦除鉄されたアルミン酸ソーダ溶液
への新たな鉄化合物の溶解が阻止され、長期間に互って
低鉄水酸化アルミの生産が可能となった。According to the present invention, the dissolution of new iron compounds into the sodium aluminate solution from which the iron has been removed is prevented, making it possible to produce low-iron aluminum hydroxide over a long period of time.
［実施例］ 次に本発明を実施例により、より具体的に説明する。[Example] Next, the present invention will be explained in more detail with reference to Examples.
（実施例１）
御所出槽における例−
Ｎ ａ ＯＨ濃度１５０ｇ／ｇ、Ａ ９２０ ｓ濃度１
２０ｇ／Ｉ２、鉄濃度５ ｍ ｇ ／ Ｉ２のアルミン
酸ソーダ溶液に、水酸化アルミニウムをｌｏｏｇ／βに
なるように添加し、３０分間撹拌後、固形分を濾別する
ことによりＮａｏＨｉｌ度１５１ ｇ／ｆｆ、Ａｆｆｓ
ｏｓ濃度１１５濃度１１５鉄／Ｉ２．ｌｐｐｍ以下のア
ルミン酸ソーダ溶液を得た。(Example 1) Example in Gosho tank - N a OH concentration 150 g/g, A 920 s concentration 1
Aluminum hydroxide was added to a sodium aluminate solution with an iron concentration of 20 g/I2 and an iron concentration of 5 mg/I2 to a loog/β, and after stirring for 30 minutes, the solid content was filtered out to give a NaoHil degree of 151 g/I2. ff, Affs
os concentration 115 concentration 115 iron/I2. A sodium aluminate solution having a concentration of 1 ppm or less was obtained.
この液をｌｏｏｍ″の炭素鋼製タンクに１０ｍ３導入し
、水酸化アルミニウム神品を５０Ｋｇ添加後、６０℃に
てｌ昼夜攪拌を行なった後、更に０ 、５ ｍ ” ／
Ｈｒの割合で該液を連続的に投入しつつ、６０℃にて
６日間攪拌を続け１合計約７トンの水酸化アルミニウム
を得た。10 m3 of this liquid was introduced into a room'' carbon steel tank, 50 kg of aluminum hydroxide was added, stirred day and night at 60°C, and an additional 0.5 m3 was added.
Stirring was continued for 6 days at 60° C. while continuously adding the liquid at a rate of 1 hour to obtain a total of about 7 tons of aluminum hydroxide.
白金メツキしたチタン線を陽極としてタンク内に固定し
、タンクに−１，１Ｖの負電圧を印加しながら製造した
水酸化アルミニウム固体中の鉄濃度を誘導結合プラズマ
発光分析法で分析定量したところ、５ｐｐｍであった。When a platinized titanium wire was fixed in a tank as an anode and a negative voltage of -1.1V was applied to the tank, the iron concentration in the aluminum hydroxide solid was analyzed and quantified using inductively coupled plasma emission spectrometry. It was 5 ppm.
また負電圧の印加によって消費された電力は、水酸化ア
ルミニウムＩＫｇ当り約Ｉ Ｗ −Ｈｒであった。Further, the power consumed by applying the negative voltage was about I W -Hr per IKg of aluminum hydroxide.
比較のために、タンクに電圧を印加しないで同。For comparison, the same without applying voltage to the tank.
様に製造を行なった水酸化アルミニウム固体中の鉄濃度
は４０ｐｐｍであった６
（実施例２）
一貯槽における例−
実施例１で得られた水酸化アルミニウムスラリー（Ｎａ
ＯＨ濃度１６０ｇ／Ｉ２、Ａｒ１．Ｏ，濃度５５ｇ／β
、鉄濃度０．１ｍｇ／β、スラリー濃度３００ ｇ／β
）をそのまま１００ｍ’の炭素鋼製タンクに−１，ＩＶ
の負電圧を印加して保持し、６０℃にて撹拌を続けた。The iron concentration in the aluminum hydroxide solid produced in the same manner was 40 ppm6 (Example 2) Example in one storage tank - The aluminum hydroxide slurry (Na
OH concentration 160g/I2, Ar1. O, concentration 55g/β
, iron concentration 0.1 mg/β, slurry concentration 300 g/β
) was directly placed in a 100m' carbon steel tank at -1,IV
A negative voltage of 1 was applied and maintained, and stirring was continued at 60°C.
毎日、少量の固形分をサンプリングし、その鉄濃度を誘
導結合プラズマ発光分析法で定量分析することを７日間
続けた。Every day, a small amount of solid matter was sampled and its iron concentration was quantitatively analyzed using inductively coupled plasma emission spectrometry for 7 days.
比較のため、タンクに負電圧を印加しないで同様に保持
したスラリー中の固形分も毎日サンプリングし、その鉄
濃度を定置分析することを７日間続けた。For comparison, the solid content in the slurry held in the same manner without applying a negative voltage to the tank was also sampled every day, and the iron concentration was analyzed in situ for 7 days.
図１に、実施例及び比較例においてサンプリング分析さ
れた水酸化アルミニウムの鉄濃度の変化の様子を示す。FIG. 1 shows changes in the iron concentration of aluminum hydroxide sampled and analyzed in Examples and Comparative Examples.
［効 果１
従来、鉄系金属は強アルカリ性溶液に対して安定とされ
、溶液中の除鉄について注力されていたが、不動態領域
でも鉄はある程度溶解し、急速に析出水酸化アルミに吸
着されること、したがって低鉄水酸化アルミを得るため
には鉄系金属の溶出防止が必要であること、金属鉄の不
活性態領域はｐ）１１４付近においては約−１，１ボル
ト以上に存在し、完全に溶解を阻止できるわけではない
か大幅な改善が一寸した装置の改造でほとんど電力を消
費せずに安価に出来ることを見出した。[Effect 1: Conventionally, iron-based metals were considered to be stable in strong alkaline solutions, and efforts were focused on removing iron from solutions. However, even in the passive region, iron dissolves to some extent and is rapidly adsorbed to precipitated aluminum hydroxide. Therefore, in order to obtain low-iron aluminum hydroxide, it is necessary to prevent the elution of iron-based metals, and the inactive region of metallic iron exists at approximately -1.1 volt or higher in the vicinity of p) 114. However, it has been discovered that while it may not be possible to completely prevent melting, a significant improvement can be made at a low cost and with little power consumption through minor modifications to the equipment.
この結果、低鉄水酸化アルミが安価に得られることにな
り、その経済的効果は絶大なものがある。As a result, low-iron aluminum hydroxide can be obtained at low cost, and the economic effect is tremendous.
実施例２において、貯槽及び構造物に−１，１Ｖの負電
圧を印加した場合（実施例）と負電圧を印加しない場合
（比較例）の水酸化アルミニウム中の鉄濃度の変化を示
す。In Example 2, changes in the iron concentration in aluminum hydroxide are shown when a negative voltage of -1.1 V is applied to the storage tank and the structure (Example) and when no negative voltage is applied (Comparative Example).
Claims (1)
に浸漬される構造物に負電圧を印加することを特徴とす
る鉄含有量の少ない水酸化アルミニウムの製造方法。(1) A method for producing aluminum hydroxide with a low iron content, which comprises applying a negative voltage to a Bayer precipitation tank, a storage tank, and a structure immersed in the tank made of an iron-based metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1009077A JPH02188424A (en) | 1989-01-18 | 1989-01-18 | Production of aluminum hydroxide low in iron content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1009077A JPH02188424A (en) | 1989-01-18 | 1989-01-18 | Production of aluminum hydroxide low in iron content |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02188424A true JPH02188424A (en) | 1990-07-24 |
Family
ID=11710553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1009077A Pending JPH02188424A (en) | 1989-01-18 | 1989-01-18 | Production of aluminum hydroxide low in iron content |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02188424A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004016833A3 (en) * | 2002-08-15 | 2004-07-08 | Alcan Int Ltd | Electrochemical scale inhibition |
-
1989
- 1989-01-18 JP JP1009077A patent/JPH02188424A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004016833A3 (en) * | 2002-08-15 | 2004-07-08 | Alcan Int Ltd | Electrochemical scale inhibition |
| US7147768B2 (en) | 2002-08-15 | 2006-12-12 | Alcan International Limited | Electrochemical scale inhibition |
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