JPH08168799A - Method of neutralizing bauxite dissolution residual - Google Patents
Method of neutralizing bauxite dissolution residualInfo
- Publication number
- JPH08168799A JPH08168799A JP31322594A JP31322594A JPH08168799A JP H08168799 A JPH08168799 A JP H08168799A JP 31322594 A JP31322594 A JP 31322594A JP 31322594 A JP31322594 A JP 31322594A JP H08168799 A JPH08168799 A JP H08168799A
- Authority
- JP
- Japan
- Prior art keywords
- acid
- product
- bauxite
- dissolution residue
- slurry
- 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
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- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はバイヤー法（改良バイヤ
ー法をも含む）におけるアルミナ製造工場から排出され
る脱硅生成物または脱硅生成物を含有するボーキサイト
溶解残渣（以下、脱硅生成物または脱硅生成物を含有す
るボーキサイト溶解残渣を総称してボーキサイト溶解残
渣と称する場合がある）の中和方法に関する。更に詳細
には中和処理後において濃縮性に優れたボーキサイト溶
解残渣が得られる中和方法に関するものである。FIELD OF THE INVENTION The present invention relates to a desilvered product discharged from an alumina manufacturing plant in a Bayer process (including an improved Bayer process) or a bauxite dissolution residue containing the desilvered product (hereinafter, desilvered product). Alternatively, the bauxite dissolution residue containing the desiliconized product may be generically referred to as a bauxite dissolution residue). More specifically, the present invention relates to a neutralization method capable of obtaining a bauxite dissolution residue having excellent concentration properties after the neutralization treatment.
【０００２】[0002]
【従来の技術】ボーキサイトを原料にしてアルミナを製
造するバイヤー法からは、アルミナ１トン当たり約８０
０ｋｇのボーキサイト溶解残渣が発生する。この組成は
ボーキサイトの種類、アルミナの製造条件（ボーキサイ
トからアルカリ溶液によるアルミナを抽出する条件等）
により一義的ではないが、通常、Ｆｅ2 Ｏ3 が４０〜５
０重量％、ソーダライトが１０〜５０重量％、その他石
英、ＴｉＯ2 、アルミナ水和物などである。2. Description of the Related Art According to the Bayer method for producing alumina using bauxite as a raw material, about 80 tons per ton of alumina is used.
0 kg of bauxite dissolution residue is generated. This composition is the type of bauxite, the production conditions of alumina (conditions for extracting alumina from bauxite with an alkaline solution, etc.)
Although not uniquely defined by the above, normally, Fe 2 O 3 is 40 to 5
0% by weight, 10 to 50% by weight of sodalite, and other materials such as quartz, TiO 2 , and alumina hydrate.
【０００３】ソーダライトはＡｌ2 Ｏ3 ，ＳｉＯ2 ，Ｎ
ａ2 ０からなる複合珪酸塩物質であり、通常脱硅生成物
と呼ばれ、通常のバイヤー法に於いては、ボーキサイト
中に含有される可溶性アルミナのアルミン酸ソーダ溶液
による抽出にさいし、ボーキサイト中に含有される可溶
性シリカがアルミン酸ソーダ溶液中に溶出し、時間の経
過と共にこれが溶液中のアルミナ及びナトリウムと反応
して脱硅生成物（ソーダライト）を形成し、溶液中より
析出してボーキサイト溶解残渣中に混入され、脱硅生成
物を含有するボーキサイト溶解残渣となっている。Sodalite is Al 2 O 3 , SiO 2 , N
It is a complex silicate substance consisting of a 20 and is usually called a desulfurization product. In the usual Bayer method, when soluble alumina contained in bauxite is extracted with a sodium aluminate solution, Soluble silica contained in is dissolved in the sodium aluminate solution, which reacts with the alumina and sodium in the solution over time to form a desiliconized product (sodalite), which precipitates from the solution to form bauxite. It is a bauxite dissolution residue that is mixed in the dissolution residue and contains desiliconized products.
【０００４】また、上記以外の改良バイヤー法と称され
るものとしては、ボーキサイトからアルミナを抽出する
工程に於いて、ボーキサイト中の可溶性アルミナは可能
な限り抽出するが、ボーキサイト中の可溶性シリカの溶
出を可能な限り防止し、かつアルミン酸ソーダ溶液中に
溶出したシリカがソーダライトに変換、析出しない間
に、アルミナ抽出後のアルミン酸ソーダ溶液とボーキサ
イト溶解残渣とを固液分離し、分離後のアルミン酸ソー
ダ溶液に種子としてソーダライトを添加することによ
り、該溶液中に溶出したシリカを脱硅生成物として析出
せしめ、析出した脱硅生成物をアルミン酸ソーダ溶液と
分離し、次いで分離後の溶液に種子としての水酸化アル
ミニウムを添加し、製品水酸化アルミニウムを得る方法
（例えば、特開昭６２−２３０６１３号公報、特開平５
−１９３９３１号公報）が知られている。Further, as a method called an improved Bayer method other than the above, in the step of extracting alumina from bauxite, soluble alumina in bauxite is extracted as much as possible, but soluble silica in bauxite is eluted. As much as possible, and while the silica eluted in the sodium aluminate solution is converted into sodalite and does not precipitate, solid-liquid separation is performed between the sodium aluminate solution after alumina extraction and the bauxite dissolution residue, and after separation. By adding sodalite as seeds to the sodium aluminate solution, the silica eluted in the solution is precipitated as a silica removal product, and the precipitated silica removal product is separated from the sodium aluminate solution, and then separated. A method of adding aluminum hydroxide as seeds to a solution to obtain a product aluminum hydroxide (see, for example, JP-A-62-62). 230613, JP-A No. 5
No. 193931) is known.
【０００５】更にボーキサイトを通常のバイヤー工程の
場合よりアルカリ濃度が高いアルミン酸ソーダ溶液を用
い、ボーキサイト中の可溶性シリカ分をできる限り溶解
せしめ、シリカ溶出後のアルミン酸ソーダ溶液と溶解残
渣に固液分離した後、該溶液には種子を添加して脱硅生
成物を晶析分離した後、上記の溶解残渣を通常のバイヤ
ー法に於けるボーキサイトと同様に処理し、アルミナを
抽出した後、ボーキサイト溶解残渣とアルミン酸ソーダ
溶液を分離し、該溶液より製品水酸化アルミニウムを得
る方法（例えば、特開平５−１７０４３４号公報等）が
知られている。これら改良バイヤー法においては脱硅生
成物、脱硅生成物の析出に種子としてボーキサイト溶解
残渣を用いた場合には脱硅生成物を主体として含有する
ボーキサイト溶解残渣、並びに実質的に脱硅生成物を含
有しないボーキサイト溶解残渣を分離して回収すること
ができる。Furthermore, bauxite is dissolved as much as possible in a soluble silica content in the bauxite using a sodium aluminate solution having a higher alkali concentration than in the case of a normal buyer process, and solid solution is formed in the sodium aluminate solution after dissolution of silica and the dissolution residue. After separation, seeds were added to the solution to crystallize and separate the desulfurized product, and the above dissolution residue was treated in the same manner as bauxite in the usual Bayer method to extract alumina and then bauxite. There is known a method of separating a dissolution residue and a sodium aluminate solution and obtaining a product aluminum hydroxide from the solution (for example, JP-A-5-170434). In these improved Buyer methods, desilvered products, when using bauxite dissolution residue as seeds for precipitation of desilica products, bauxite dissolution residue containing mainly desilica product, and substantially desilica product The bauxite dissolution residue containing no can be separated and recovered.
【０００６】上記したいずれのバイヤー法においても、
脱硅生成物や脱硅生成物を含有するボーキサイト溶解残
渣は、何らかの形で有効利用する以外はスラリー状態で
排出され海洋投棄、埋立て等によって処分されている
が、洗浄後のこれらボーキサイト溶解残渣は、通常ｐＨ
１２〜１３であるため法規制を満たすためにｐＨ５〜９
に中和処理する必要がある。そこで、通常は洗浄直後の
ボーキサイト溶解残渣を濃縮あるいは濾過した後、硫
酸、塩酸等の無機酸を添加して中和処理し排出する、あ
るいはさらに再濃縮を行い排出する等の方法によって処
理を行っている。In any of the above buyer methods,
Desulfurized products and bauxite dissolution residues containing desilvered products are discharged in a slurry state and disposed of by ocean dumping, landfill, etc., except for effective use in some form, but these bauxite dissolution residues after washing are used. Is usually pH
Since it is 12 to 13, the pH is 5 to 9 to satisfy the legal regulation.
Need to be neutralized. Therefore, the bauxite dissolution residue immediately after washing is usually concentrated or filtered, and then treated with a method such as adding an inorganic acid such as sulfuric acid or hydrochloric acid to neutralize and discharge, or further reconcentrating and discharging. ing.
【０００７】ボーキサイト溶解残渣は中和後、時間の経
過にともない一義的ではないもののｐＨが９〜１０程度
まで上昇する性質がある。そこで、放棄時に規定のｐＨ
になるようにｐＨ５〜６付近を目標にして中和がおこな
われている。しかしながら、この場合（１）中和処理後
のスラリーの粘性が高く濃縮性が悪いため、配管による
ポンプ輸送の場合には閉塞等、またトラック、船舶等を
用いる場合には輸送性、輸送コストを著しく悪化すると
の欠点を有する。加えて、使用する酸のｐＨが低いため
中和設備が腐食する等の問題も有する。After neutralization, the bauxite dissolution residue has a property that the pH rises to about 9 to 10 though it is not unique with the lapse of time. Therefore, at the time of abandonment, the prescribed pH
Neutralization is carried out aiming at pH around 5-6. However, in this case, (1) the viscosity of the slurry after the neutralization treatment is high and the concentration is poor, so that blockage or the like occurs when pumping by pipes, and transportability and transportation cost when using a truck, ship, etc. It has the drawback of becoming significantly worse. In addition, since the pH of the acid used is low, there is a problem such as corrosion of the neutralization equipment.
【０００８】中和時ボーキサイト溶解残渣のｐＨが４．
５付近になると固化する性質があること、更にはｐＨが
低いので中和設備の材質を考慮する必要がある等の欠点
を解消する目的より、中和処理を少なくとも３段階に分
けて行うとともに、第１段階の中和の目標ｐＨ値を７〜
１０とすることを特徴とするボーキサイト溶解残渣の中
和処理法が知られている（特公昭５９−１５７１９号公
報）。When neutralized, the pH of the bauxite dissolution residue is 4.
For the purpose of eliminating the drawbacks such as the fact that it solidifies near 5, and the need to consider the material of the neutralization equipment due to the low pH, the neutralization treatment is performed in at least three stages, and The target pH value for the first stage neutralization is 7-
A method for neutralizing a bauxite dissolution residue, which is characterized in that it is 10, is known (Japanese Patent Publication No. 59-15719).
【０００９】該中和方法によれば、従来法に比較し、溶
解残渣の固化が避けられる、中和設備の材質を考慮する
必要が殆どなくなり、かつ、中和に要する全硫酸量が、
１段又は２段中和に比較し大幅に減少するとの効果がう
たわれている。しかしながら、該方法においても、中和
処理後のスラリーの濃縮性は悪く、廃棄処理に要する輸
送コストが水酸化アルミニウムの製造原価に与える影響
は無視しえない問題点であった。According to the neutralization method, as compared with the conventional method, solidification of the dissolution residue can be avoided, there is almost no need to consider the material of the neutralization equipment, and the total amount of sulfuric acid required for the neutralization is
The effect is said to be significantly reduced compared to the one-stage or two-stage neutralization. However, even in this method, the concentration property of the slurry after the neutralization treatment is poor, and the effect of the transportation cost required for the disposal treatment on the production cost of aluminum hydroxide is a problem that cannot be ignored.
【００１０】[0010]
【発明が解決しようとする課題】かかる事情下に鑑み、
本発明者等は中和処理後においても濃縮性に優れたボー
キサイト溶解残渣の中和処理方法を見いだすことを目的
とし鋭意検討した結果、濃縮性を悪化せしめる主成分が
ボーキサイト溶解残渣中に含有される脱硅生成物である
こと、さらに中和処理にさいし特定の濃度以下の酸を用
いる場合には上記不都合が実質的に解消し得ることを見
いだし、本発明を完成するに至った。In view of such circumstances, in view of the above circumstances,
The present inventors have conducted diligent studies for the purpose of finding a method for neutralizing a bauxite dissolution residue having excellent concentration properties even after the neutralization process, and as a result, a main component that deteriorates the concentration property is contained in the bauxite dissolution residue. It has been found that the above-mentioned inconveniences can be substantially eliminated when the acid is a desilvered product, and when an acid having a specific concentration or less is used in the neutralization treatment, the present invention has been completed.
【００１１】[0011]
【課題を解決するための手段】すなわち、本発明はバイ
ヤー法におけるアルミナ製造工程より排出される脱硅生
成物または脱硅生成物を含有するボーキサイト溶解残渣
の中和処理において、３Ｎ以下の濃度の酸を用いること
を特徴とするボーキサイト溶解残渣の中和方法を提供す
るにある。[Means for Solving the Problems] That is, the present invention provides a neutralization treatment of a desilica product or a bauxite dissolution residue containing the desilica product discharged from the alumina production step in the Bayer method, at a concentration of 3 N or less. Another object is to provide a method for neutralizing a bauxite dissolution residue, which is characterized by using an acid.
【００１２】以下、本発明を更に詳細に説明する。本発
明が中和処理を対象とするボーキサイト溶解残渣は、バ
イヤー法におけるアルミナ製造工程より排出される脱硅
生成物または脱硅生成物を含有するボーキサイト溶解残
渣である。該脱硅生成物を含有するボーキサイト溶解残
渣は、ボーキサイト鉱石中の可溶性アルミナ分を高温、
高圧下、苛性ソーダやアルミン酸ソーダ溶液等のアルカ
リ溶液で充分抽出し、抽出処理後のスラリーを固液分離
し、ボーキサイト溶解残渣とアルミン酸ソーダ溶液とに
分離して得られるものである。該ボーキサイト鉱石中に
は、程度の差はあるものの通常０．５〜数重量％のアル
カリに可溶のシリカが含有されており、ボーキサイト鉱
石中よりアルカリ溶液によるアルミナの抽出時、同様に
ボーキサイト鉱石中のシリカ分が抽出され、これがアル
ミン酸ソーダ溶液中のアルミナ分及びソーダ分と反応し
脱硅生成物（ソーダーライト）となり、析出してボーキ
サイト溶解残渣中に含有されている。かかるボーキサイ
ト溶解残渣中の脱硅生成物の量は特に制限されないが、
通常ボーキサイト溶解残渣中に約５重量％以上、普通に
は約１０重量％〜約５０重量％であり、これ以下の場合
には濃縮特性に与える影響は少ない。The present invention will be described in more detail below. The bauxite dissolution residue targeted for the neutralization treatment in the present invention is a desilica product or a bauxite dissolution residue containing the desilication product discharged from the alumina production step in the Bayer method. The bauxite dissolution residue containing the desulfurized product removes the soluble alumina content in the bauxite ore at high temperature,
It is obtained by sufficiently extracting with an alkaline solution such as caustic soda or sodium aluminate solution under high pressure, solid-liquid separation of the slurry after the extraction treatment, and separation into a bauxite dissolution residue and a sodium aluminate solution. The bauxite ore normally contains 0.5 to several weight% of alkali-soluble silica, though to a different degree, and when the alumina is extracted from the bauxite ore with an alkaline solution, the bauxite ore is similarly added. The silica content therein is extracted, and this reacts with the alumina content and the soda content in the sodium aluminate solution to become a desiliconized product (sodalite), which is deposited and contained in the bauxite dissolution residue. The amount of the silica removal product in the bauxite dissolution residue is not particularly limited,
Usually, it is about 5% by weight or more, usually about 10% by weight to about 50% by weight in the bauxite dissolution residue, and if it is less than this, there is little influence on the concentration characteristics.
【００１３】また本発明が対象とする脱硅生成物とは、
前記した特開昭６２−２３０６１３号、特開平５−１７
０４３４号、特開平５−１９３９３１号等の所謂改良バ
イヤー法と称される、溶液中にシリカを溶出せしめたま
ま、ボーキサイト溶解残渣を分離し、分離後の溶液に種
子として脱硅生成物、ソーダライト或いはボーキサイと
スラリーを加え、晶析せしめて得た、脱硅生成物、或い
は脱硅生成物を主体として含有するボーキサイト溶解残
渣である。脱硅生成物を主体として含有するボーキサイ
ト溶解残渣とは、特に制限はないものの、通常脱硅生成
物が約５０重量％以上、普通には脱硅生成物が約６０重
量％以上のボーキサイト溶解残渣をいう。The desiliconized product targeted by the present invention is
The above-mentioned JP-A-62-230613 and JP-A-5-17
No. 0434, JP-A-5-193931, etc., so-called improved Bayer method, in which silica is dissolved in the solution while the bauxite dissolution residue is separated, and the solution after separation is dehydrated as seeds, soda. It is a desiliconized product obtained by crystallizing by adding light or bauxite and a slurry, or a bauxite dissolution residue mainly containing the desiliconized product. The bauxite dissolution residue containing mainly desilica products is not particularly limited, but usually, the dewaxed product is about 50% by weight or more, and usually the dewaxed product is about 60% by weight or more. Say.
【００１４】本発明において中和処理に用いる酸は、３
Ｎ以下、好ましくは２Ｎ以下、より好ましくは１Ｎ以下
の濃度を有する希薄酸を用いることを必須とする。下限
は特に制限されないが、中和後の処理液量の関係から、
通常、０．１Ｎ以上の酸濃度のものが使用される。ま
た、酸の種類は特に制限されないが、入手容易性、取扱
い性、経済性等の点より、通常、硫酸、塩酸、炭酸ガス
等の酸、好適には硫酸が挙げられ、これらは混酸、或い
はこれらを含有する廃酸であってもよい。酸濃度が３Ｎ
を越える場合には所望とする濃縮効果は得られない。本
発明に於いては、希薄酸を用いるために処理液量が増加
するが、中和後に再濃縮し、その上澄み液をリサイクル
して酸の希釈に利用すれば、余分に使用する水の量を低
減することが可能である。他方、本発明を改良バイヤー
法により得られる脱硅生成物或いは脱硅生成物を主体と
して含有するボーキサイト溶解残渣の中和処理にのみ用
い、他の実質的に脱硅生成物を含有しないボーキサイト
残渣は従来と同様の高濃度の酸を用いる場合には、通常
改良バイヤー法に於ける脱硅生成物の量は全ボーキサイ
ト溶解残渣の１０〜５０重量％程度であるので、処理液
量の増加を抑えることが可能である。本発明において中
和条件は特に限定的ではないが、中和処理時、酸と脱硅
生成物等の接触を均一にせしめる目的より、攪拌処理を
行うことが推奨される。In the present invention, the acid used for the neutralization treatment is 3
It is essential to use a dilute acid having a concentration of N or less, preferably 2N or less, more preferably 1N or less. The lower limit is not particularly limited, but from the relationship of the amount of treatment liquid after neutralization,
Usually, an acid concentration of 0.1 N or higher is used. The type of acid is not particularly limited, but from the viewpoints of availability, handleability, economy, etc., usually, acids such as sulfuric acid, hydrochloric acid, carbon dioxide gas, preferably sulfuric acid, and preferably sulfuric acid are mixed acids, or It may be a waste acid containing these. Acid concentration is 3N
If it exceeds, the desired concentration effect cannot be obtained. In the present invention, the amount of treatment liquid increases because a dilute acid is used, but if it is reconcentrated after neutralization and the supernatant liquid is recycled to dilute the acid, the amount of extra water used Can be reduced. On the other hand, the present invention is used only for the neutralization treatment of the desilvered product obtained by the improved Bayer method or the bauxite dissolution residue mainly containing the desilvered product, and other bauxite residue substantially free of the desilvered product. When the same high concentration of acid as in the conventional case is used, the amount of the desiliconized product in the improved Bayer method is usually about 10 to 50% by weight of the total bauxite dissolution residue. It is possible to suppress. In the present invention, the neutralization conditions are not particularly limited, but it is recommended to carry out a stirring treatment during the neutralization treatment for the purpose of making the contact between the acid and the desiliconized product uniform.
【００１５】[0015]
【作用】本発明方法を実施することにより、何故、かか
る効果が発現するのか詳らかではないが、脱硅生成物或
いは脱硅生成物を含有するボーキサイト溶解残渣を高濃
度の酸で中和処理する場合には、脱硅生成物を構成する
Ａｌ2 Ｏ3 とＳｉＯ2 が溶出し無定形のアルミナゲルや
シリカゲルとなり濃縮特性に影響を与えるが、中和処理
に希薄濃度の酸を用いる場合には、中和反応が極めてゆ
っくり進行することにより、Ａｌ2 Ｏ3 とＳｉＯ2 の溶
出が抑制され、脱硅物の骨格構造が崩れないことより濃
縮性の優れた脱硅生成物或いは脱硅生成物を含有するボ
ーキサイト溶解残渣が得られるものと推測される。Although it is not clear why such effects are exhibited by carrying out the method of the present invention, the desilica product or the bauxite dissolution residue containing the desilica product is neutralized with a high concentration of acid. In this case, Al 2 O 3 and SiO 2 constituting the desulfurized product are eluted to form amorphous alumina gel or silica gel, which affects the concentration characteristics. However, when a dilute concentration of acid is used for the neutralization treatment, As the neutralization reaction proceeds extremely slowly, the elution of Al 2 O 3 and SiO 2 is suppressed, and the skeletal structure of the desulfurized product does not collapse, so that the desilvered product or desilvered product having excellent concentration properties can be obtained. It is presumed that a bauxite dissolution residue containing is obtained.
【００１６】[0016]
【発明の効果】本発明によれば、脱硅生成物或いは脱硅
生成物を含有するボーキサイト溶解残渣の中和処理にさ
いし、単に、特定濃度以下の希薄酸酸を用いるという極
めて簡単な操作により、粘性が低く、濃縮性やハンドリ
ング性の良好な、スラリーを得ることができるもので、
廃棄或いは埋め立て場所への運搬費用を著しく低減する
ことが可能であるとともに、低濃度の希薄酸を用いるの
で装置の酸腐食も低減し得るとの効果をも有するもの
で、その産業上の利用価値は頗る大である。INDUSTRIAL APPLICABILITY According to the present invention, the neutralization treatment of the desilvered product or the bauxite dissolution residue containing the silicified product is carried out by an extremely simple operation of simply using dilute acid acid at a specific concentration or less. It has low viscosity, good concentration and handling properties, and can be a slurry.
It is possible to significantly reduce the cost of disposal or transportation to the landfill site, and since it uses a dilute acid with a low concentration, it also has the effect that acid corrosion of the equipment can be reduced. Is very large.
【００１７】[0017]
【実施例】以下に本発明を実施例により更に詳細に説明
する。尚、以下の実施例、比較例においてｐＨ測定には
ガラス電極式ｐＨメーターを用い測定した。EXAMPLES The present invention will be described in more detail below with reference to examples. In the following examples and comparative examples, a glass electrode type pH meter was used for pH measurement.
【００１８】実施例１ １００ｇ／ｌ、ｐＨ１２．５である、脱硅生成物を含有
するボーキサイトの溶解残渣（組成、ＳｉＯ2 ：１３．
４重量％、Ａｌ2 Ｏ3 ：２０．９重量％、Ｆｅ 2 Ｏ3 ：
４０．９重量％、ＴｉＯ2 ：５．９重量％、Ｎａ2 ０：
７．９重量％）よりなるスラリー２５リットルを撹拌し
ながらスラリーのｐＨが７．０になるように０．６Ｎ
（３重量％）硫酸を添加した。その後、該中和処理後の
スラリーを内径０．２ｍφ、高さ１ｍの円筒状ガラス容
器に入れ、ポリアクリル酸ソーダ系高分子凝集剤（商品
名：ＰＡ３１７、栗田工業株式会社製）を固体に対して
２００ｐｐｍ添加し充分攪拌した後自然沈降させた。２
４時間後の沈降物の濃度は５１０ｇ／ｌであった。Example 1 100 g / l, pH 12.5, containing desiliconized product
Dissolved residue of bauxite (composition, SiO2: 13.
4% by weight, Al2O3: 20.9% by weight, Fe 2O3:
40.9% by weight, TiO2: 5.9% by weight, Na20:
7.9% by weight) and stirred 25 liters of slurry
While adjusting the pH of the slurry to 7.0 N
Sulfuric acid (3% by weight) was added. Then, after the neutralization treatment
A cylindrical glass container with an inner diameter of 0.2 mφ and a height of 1 m
Put it in a container and put it in a polysodium acrylate polymer coagulant
Name: PA317, manufactured by Kurita Water Industries Ltd.)
After adding 200 ppm and stirring sufficiently, it was allowed to spontaneously sediment. 2
The concentration of the sediment after 4 hours was 510 g / l.
【００１９】実施例２ １００ｇ／ｌ、ｐＨ１２．５の改良バイヤー法より得ら
れた実質的に脱硅生成物よりなる残渣（組成、Ｓｉ
Ｏ2 ：１９．３重量％、Ａｌ2 Ｏ3 ：３１．３重量％、
Ｆｅ2 Ｏ3 ：１９．４重量％、ＴｉＯ2 ：２．８重量
％、Ｎａ2 ０：１４．９重量％）スラリー３リットルを
撹拌しながらスラリーのｐＨが７．０になるように０．
６Ｎ（３重量％）硫酸を添加した。また、１００ｇ／
ｌ、ｐＨ１２．５の改良バイヤー法より得られた実質的
に脱硅生成物を含有しないボーキサイト溶解残渣（組
成、ＳｉＯ2 ：１４．３重量％、Ａｌ2 Ｏ3 ：１７．３
重量％、Ｆｅ2 Ｏ3 ：５１．２重量％、ＴｉＯ2 ：５．
８重量％、Ｎａ2 ０：１．５重量％）よりなるスラリー
２２リットルを撹拌しながらスラリーのｐＨが７．０に
なるように７．４Ｎ（３０重量％）硫酸を添加した。そ
の後、該中和処理後の両方のスラリーを混合後、内径
０．２ｍφ、高さ１ｍの円筒状ガラス容器に入れ、ポリ
アクリル酸ソーダ系高分子凝集剤（商品名：ＰＡ３１
７、栗田工業株式会社製）を固体に対して２００ｐｐｍ
添加し充分攪拌した後自然沈降させた。２４時間後の沈
降物の濃度は５３０ｇ／ｌであった。Example 2 Residue (composition, Si, consisting essentially of desiliconized product obtained by the modified Bayer process of 100 g / l, pH 12.5)
O 2 : 19.3% by weight, Al 2 O 3 : 31.3% by weight,
Fe 2 O 3: 19.4 wt%, TiO 2: 2.8 wt%, Na 2 0: 14.9 wt%) as the pH of the slurry while the slurry stirred for 3 l becomes 7.0 0.
6N (3 wt%) sulfuric acid was added. Also, 100 g /
l, bauxite dissolution residue containing substantially no de硅product obtained from improved Bayer process of pH 12.5 (composition, SiO 2: 14.3 wt%, Al 2 O 3: 17.3
% By weight, Fe 2 O 3 : 51.2% by weight, TiO 2 : 5.
While stirring 22 liters of a slurry composed of 8 wt% and Na 2 0: 1.5 wt%), 7.4N (30 wt%) sulfuric acid was added so that the pH of the slurry was 7.0. Then, after mixing both of the slurries after the neutralization treatment, the slurry was placed in a cylindrical glass container having an inner diameter of 0.2 mφ and a height of 1 m, and a sodium polyacrylate-based polymer flocculant (trade name: PA31
7, manufactured by Kurita Water Industries, Ltd.) relative to the solid content of 200 ppm
After adding and stirring sufficiently, it was naturally precipitated. The concentration of the sediment after 24 hours was 530 g / l.
【００２０】実施例３ ４５０ｇ／ｌ、ｐＨ１２．５の改良バイヤー法より得ら
れた実質的に脱硅生成物よりなる残渣（組成、Ｓｉ
Ｏ2 ：１９．３重量％、Ａｌ2 Ｏ3 ：３１．３重量％、
Ｆｅ2 Ｏ3 ：１９．４重量％、ＴｉＯ2 ：２．８重量
％、Ｎａ2 ０：１４．９重量％）スラリー３リットルを
撹拌しながらスラリーのｐＨが７．０になるように０．
６Ｎ（３重量％）硫酸を添加した。次いでこのスラリー
を真空濾過にて水分を４５０ｇ／ｌに調整した。また、
４５０ｇ／ｌ、ｐＨ１２．５の改良バイヤー法より得ら
れた実質的に脱硅生成物を含有しないボーキサイト溶解
残渣（組成、ＳｉＯ2 ：１４．２重量％、Ａｌ2 Ｏ3 ：
１９．１重量％、Ｆｅ2 Ｏ3 ：４８．０重量％、ＴｉＯ
2 ：６．６重量％、Ｎａ2 ０：２．４重量％）よりなる
スラリー２２リットルを撹拌しながらスラリーのｐＨが
７．０になるように７．４Ｎ（３０重量％）硫酸を添加
した。次いで、上記中和処理後の両方のスラリーを混合
した後、管径０．０８ｍの配管を１ｍ／ｓｅｃの流速で
流しスラリーの粘性を測定した。その結果１ｍ当たりの
圧力損失△ｐ／ｌの値は６５０Ｐａであった。Example 3 Residue (composition, Si) consisting essentially of desiliconized product obtained by the modified Bayer process of 450 g / l, pH 12.5
O 2 : 19.3% by weight, Al 2 O 3 : 31.3% by weight,
Fe 2 O 3: 19.4 wt%, TiO 2: 2.8 wt%, Na 2 0: 14.9 wt%) as the pH of the slurry while the slurry stirred for 3 l becomes 7.0 0.
6N (3 wt%) sulfuric acid was added. Then, the water content of the slurry was adjusted to 450 g / l by vacuum filtration. Also,
450 g / l, bauxite dissolution residue (composition containing substantially no de硅product obtained from improved Bayer process of pH 12.5, SiO 2: 14.2 wt%, Al 2 O 3:
19.1% by weight, Fe 2 O 3 : 48.0% by weight, TiO
(2 : 6.6 wt%, Na 2 0: 2.4 wt%) While stirring 22 liters of a slurry, 7.4N (30 wt%) sulfuric acid was added so that the pH of the slurry was 7.0. . Next, both the slurries after the neutralization treatment were mixed, and then a pipe having a pipe diameter of 0.08 m was flowed at a flow rate of 1 m / sec to measure the viscosity of the slurry. As a result, the value of pressure loss Δp / l per 1 m was 650 Pa.
【００２１】比較例１ 実施例１に於いて中和処理に用いる硫酸を０．６Ｎの濃
度のものから、７．４Ｎの濃度のものに代えた他は実施
例１と全く同様の条件で中和処理を行い、中和処理後の
スラリーの沈降性を実施例１と同一方法で測定した。そ
の結果２４時間後の沈降物の濃度は２８０ｇ／ｌであっ
た。Comparative Example 1 Under the same conditions as in Example 1, except that the sulfuric acid used in the neutralization treatment in Example 1 had a concentration of 0.6 N and a concentration of 7.4 N. A slag treatment was performed, and the sedimentation property of the slurry after the neutralization treatment was measured by the same method as in Example 1. As a result, the concentration of sediment after 24 hours was 280 g / l.
【００２２】比較例２ 実施例２に於いて脱硅生成物の中和処理に用いた酸を
０．６Ｎの硫酸から７．４Ｎの硫酸に代えた他は実施例
２と全く同様の条件で中和処理を行い、実施例２と同様
の方法で中和処理した実質的にボーキサイト溶解残渣よ
りなるスラリーと混合した後、中和処理後のスラリーの
沈降性を実施例２と同一方法で測定した。その結果２４
時間後の沈降物の濃度は３４０ｇ／ｌであった。Comparative Example 2 Under the same conditions as in Example 2, except that the acid used in the neutralization treatment of the desulfurized product in Example 2 was changed from 0.6N sulfuric acid to 7.4N sulfuric acid. The mixture was neutralized and mixed with a slurry substantially consisting of bauxite dissolution residue neutralized by the same method as in Example 2, and the sedimentation property of the slurry after neutralization was measured by the same method as in Example 2. did. As a result 24
The concentration of the sediment after time was 340 g / l.
【００２３】比較例３ 実施例３に於いて実質的に脱硅生成物よりなる残渣の中
和処理に用いる硫酸を０．６Ｎの濃度のものから、７．
４Ｎの硫酸に代えた他は実施例３と全く同様の方法で中
和処理し、混合後のスラリーの粘性を測定した。その結
果１ｍ当たりの圧力損失△ｐ／ｌの値は１２５０Ｐａで
あった。Comparative Example 3 From the sulfuric acid used in Example 3 for neutralizing the residue consisting essentially of the desulfurized product, the sulfuric acid having a concentration of 0.6 N was used.
Neutralization treatment was performed in the same manner as in Example 3 except that 4N sulfuric acid was used, and the viscosity of the mixed slurry was measured. As a result, the value of pressure loss Δp / l per 1 m was 1250 Pa.
【００２４】実施例４ 実施例１に於いて中和処理に用いた酸を０．６Ｎの硫酸
から０．８Ｎの塩酸に代えた他は実施例１と全く同様に
中和処理し、処理後のスラリーの濃縮性を実施例１と全
く同様の方法で調べた。その結果２４時間後の沈降物の
濃度は５４０ｇ／ｌであった。Example 4 Neutralization treatment was carried out in the same manner as in Example 1 except that the acid used in the neutralization treatment in Example 1 was changed from 0.6N sulfuric acid to 0.8N hydrochloric acid. The concentrating property of the slurry was examined in the same manner as in Example 1. As a result, the concentration of sediment after 24 hours was 540 g / l.
Claims (2)
り排出される脱硅生成物または脱硅生成物を含有するボ
ーキサイト溶解残渣の中和処理において、３Ｎ以下の濃
度の酸を用いることを特徴とするボーキサイト溶解残渣
の中和方法。1. A bauxite characterized by using an acid having a concentration of 3N or less in the neutralization treatment of a desulfurized product discharged from the alumina production step in the Bayer method or a bauxite dissolution residue containing the desulfurized product. Method for neutralizing dissolved residues.
酸のいずれか一種であることを特徴と請求項１記載のボ
ーキサイト溶解残渣の中和方法。2. The method for neutralizing a bauxite dissolution residue according to claim 1, wherein the acid is one of sulfuric acid, hydrochloric acid, and an acid containing them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31322594A JP3663647B2 (en) | 1994-12-16 | 1994-12-16 | Bauxite dissolution residue neutralization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31322594A JP3663647B2 (en) | 1994-12-16 | 1994-12-16 | Bauxite dissolution residue neutralization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08168799A true JPH08168799A (en) | 1996-07-02 |
| JP3663647B2 JP3663647B2 (en) | 2005-06-22 |
Family
ID=18038624
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31322594A Expired - Fee Related JP3663647B2 (en) | 1994-12-16 | 1994-12-16 | Bauxite dissolution residue neutralization method |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007516922A (en) * | 2003-12-24 | 2007-06-28 | マウント・アスパイアリング・ジオケミストリー・コンサルタンツ・プロプライエタリー・リミテッド | Porous granular material for fluid treatment, cementitious composition and method for producing them |
| KR101252056B1 (en) * | 2012-09-18 | 2013-04-12 | 한국지질자원연구원 | Treating method of aluminum production waste with acid |
| TWI398408B (en) * | 2007-12-26 | 2013-06-11 | Showa Denko Kk | Process for neutralizing bauxite dissolution residual substance and process for producing aluminum hydroxide |
| JP2014518762A (en) * | 2011-05-16 | 2014-08-07 | エクスパンション エナジー， エルエルシー | Systems and methods for carbon capture and separation, environmental remediation and metal recovery |
-
1994
- 1994-12-16 JP JP31322594A patent/JP3663647B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007516922A (en) * | 2003-12-24 | 2007-06-28 | マウント・アスパイアリング・ジオケミストリー・コンサルタンツ・プロプライエタリー・リミテッド | Porous granular material for fluid treatment, cementitious composition and method for producing them |
| TWI398408B (en) * | 2007-12-26 | 2013-06-11 | Showa Denko Kk | Process for neutralizing bauxite dissolution residual substance and process for producing aluminum hydroxide |
| JP2014518762A (en) * | 2011-05-16 | 2014-08-07 | エクスパンション エナジー， エルエルシー | Systems and methods for carbon capture and separation, environmental remediation and metal recovery |
| KR101252056B1 (en) * | 2012-09-18 | 2013-04-12 | 한국지질자원연구원 | Treating method of aluminum production waste with acid |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3663647B2 (en) | 2005-06-22 |
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