JPS644969B2 - - Google Patents
Info
- Publication number
- JPS644969B2 JPS644969B2 JP58193859A JP19385983A JPS644969B2 JP S644969 B2 JPS644969 B2 JP S644969B2 JP 58193859 A JP58193859 A JP 58193859A JP 19385983 A JP19385983 A JP 19385983A JP S644969 B2 JPS644969 B2 JP S644969B2
- Authority
- JP
- Japan
- Prior art keywords
- red mud
- granules
- discharged
- ash
- coal
- 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.)
- Expired
Links
- 239000008187 granular material Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000005469 granulation Methods 0.000 claims description 9
- 230000003179 granulation Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000005243 fluidization Methods 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000004131 Bayer process Methods 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000003516 soil conditioner Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/14—Methods for preparing oxides or hydroxides in general
- C01B13/145—After-treatment of oxides or hydroxides, e.g. pulverising, drying, decreasing the acidity
Description
本発明は赤泥ケーキの造粒方法に関し、さらに
具体的には、本発明の赤泥ケーキの造粒方法は、
アルミニウム製造工程から排出された赤泥スラリ
を過濃縮し、得られた含水赤泥ケーキを造粒機
で造粒し、該造粒工程の粒体の成長がほぼ終了し
た段階で石炭焚き流動床ボイラの排出灰を添加し
て混合し、粒体の表面に強固な殻を形成すること
を特徴とする。
赤泥、即ちいわゆるバイヤー法によるアルミナ
製造工程においてボーキサイトからアルミナ分を
アルカリ抽出した残渣は、通常、Fe2O330〜50重
量％、Al2O315〜25重量％、SiO28〜15重量％、
TiO25〜10重量％、Na2O3〜10重量％、Ig.Loss8
〜12重量％なる組成で、その構成粒子は非常に微
細なものである。
この赤泥は、従来は、産業廃棄物として海洋投
棄、埋立等に処理されていたが、セメント製造時
の鉄源、人工骨材や煉瓦等の耐火物原料、触媒担
体あるいは土壌改良剤等の多くの用途が見出され
ている。
そのような赤泥はアルミナ製造工程において多
量の水分を含むスラリ状として排出されるので、
いずれの用途に利用するにしても水分を除去し取
扱い易い形態としなければならない。そのために
通常脱水、乾燥が行なわれているが、赤泥の構成
粒子が非常に微細であるために脱水され難く、貯
蔵ホツパやベルトコンベヤ乗継部に居付き、取扱
いが困難であるし、又経時により表面の水分が蒸
発すれば発塵して作業環境を悪化させていた。こ
のように、脱水赤泥ケーキは付着性と発塵性とい
う二律背反的な取扱い上の欠点を有する。
このような性質を有する赤泥の処理方法とし
て、例えば特開昭52−3596号公報に示されるよう
に、外部から熱を加えながら造粒する方法や、又
特開昭48−45494号公報に示されるように、予め
十分に脱水してペレツト状となした赤泥に対して
高価な薬剤を加えて脱水処理する方法が提案され
ているが、これらの方法によつても問題は完全に
解消したわけではない。
本発明は、上述の赤泥を取扱い易い形態となす
方法に係り、その要旨は造粒機に供給された水分
30％前後の含水赤泥ケーキだけでは水分が多いた
めに均一な流動をしないが、粒体が生成し生長し
ほぼ成長の終つた段階で石炭焚き流動床ボイラの
排出灰を加えながら造粒することである。
すなわち、本発明は、赤泥スラリの過ケーキ
に石炭焚き流動床ボイラの排出灰を造粒形成間隙
の粒表面に添加することによつて、排出灰に含む
CaOの消和反応による発熱による造粒表面水分の
蒸発作用、赤泥の吸着による硬化作用及び大部分
の微粒灰による赤泥粒表面の水分吸収作用、コー
テイング効果によつて、粒体の表面に強固な殻を
形成し、付着性が無くかつ強固な粒体となすこと
ができるので、従来の問題点は完全に解消される
に至つた。
以下、本発明の一実施例について説明する。
アルミナ製造工程から排出された赤泥スラリを
プレスフイルタで付着水分29.3重量％に過濃縮
し、第１表に示す粒度分布の粒子から成る赤泥ケ
ーキを得た。
この赤泥ケーキを、内径5.0ｍ、深さ1.05ｍの
皿型造粒機を6.4rpm、傾斜角49゜で運転し、供給
赤泥量に対して15重量％の石炭焚き流動床ボイラ
拝出灰を加えて造粒した。この場合に加える排出
灰は赤泥が造粒され、造粒機から取出される間際
で赤泥と混合されるべく添加した。
石炭焚き流動床ボイラ排出灰を造粒終了間際に
入れるのは、水分18〜20重量％よりは相当水分の
多い赤泥ケーキを用いるので、造粒の初期の段階
からこれら粉粒体を添加しても、造粒硬化と無関
係に消費されるのみで多量の粉粒体を必要とする
が、粒体が生成、成長しほぼ成長が終つた段階で
該排出灰を添加すれば、少量の添加で効率よく粒
体の表面に強固な殻を形成するからである。
次いで、このようにして造粒された造粒物に対
して破砕試験を行ない、重量438ｇの鋼球を高さ
10mmの位置から落下させて破砕するまでの回数を
測定した。この石炭焚き流動床ボイラ排出灰を添
加した赤泥造粒物についての破砕するまでの落下
回数を石灰工場ダストを添加した赤泥造粒物につ
いて同様に求めた破砕するまでの落下回数を第２
表に示す。回数が多いことは硬化強度が大きいこ
とを意味する。
本発明では水分を多量に含む赤泥スラリを通常
工業的に容易になし得る程度の水分（25〜35重量
％）を持つ赤泥ケーキに留め、それ以下に水分を
減少させるために加熱するとか脱水剤的薬剤を加
えるとかの手段を採ることなく、石炭焚き流動床
ボイラ排出灰等の前述の排出灰を造粒終了間際に
添加するという簡単な操作により強固でかつホツ
パー等収納容器に付着することがない造粒物とす
ることができる。
以上述べたように、本発明によれば取扱いに困
難な赤泥を付着性が無くかつ強固な粒体となす事
ができるのでその後諸用途に利用する場合に取扱
いが容易となる。
なお、本発明で用いる造粒は転動造粒に限るこ
となく振動造粒でもよい。
The present invention relates to a method for granulating red mud cake, and more specifically, the method for granulating red mud cake of the present invention includes:
The red mud slurry discharged from the aluminum production process is overconcentrated, the resulting water-containing red mud cake is granulated using a granulator, and when the growth of the granules in the granulation process is almost completed, it is placed in a coal-fired fluidized bed. It is characterized by adding boiler discharge ash and mixing it to form a strong shell on the surface of the granules. Red mud, that is, the residue obtained by alkali extraction of alumina from bauxite in the so-called Bayer process alumina manufacturing process, usually contains 30 to 50% by weight of Fe 2 O 3 , 15 to 25% by weight of Al 2 O 3 , and 8 to 15% by weight of SiO 2 . weight%,
TiO2 5~10wt%, Na2O3 ~10wt%, Ig.Loss8
The composition is ~12% by weight, and the constituent particles are very fine. Traditionally, this red mud was disposed of as industrial waste, such as by ocean dumping or landfill, but it can also be used as a source of iron in cement manufacturing, as a raw material for refractories such as artificial aggregate and bricks, as a catalyst carrier, and as a soil conditioner. It has found many uses. Such red mud is discharged as a slurry containing a large amount of water during the alumina manufacturing process, so
When used for any purpose, moisture must be removed and it must be made into a form that is easy to handle. For this purpose, dewatering and drying are usually performed, but the constituent particles of red mud are very fine, making it difficult to dehydrate, and they settle in storage hoppers and belt conveyor transfer areas, making them difficult to handle. As moisture on the surface evaporates over time, dust is generated, worsening the working environment. As described above, dehydrated red mud cake has the trade-off drawbacks of adhesion and dust generation. As a method for treating red mud having such properties, for example, there is a method of granulating it while applying heat from the outside, as shown in Japanese Patent Application Laid-Open No. 52-3596, and a method of granulating it while applying heat from the outside, as shown in Japanese Patent Application Laid-Open No. 48-45494. As shown in the figure, a method has been proposed in which red mud is dehydrated by adding expensive chemicals to the red mud, which has been sufficiently dehydrated and made into pellets, but these methods do not completely solve the problem. Not that I did. The present invention relates to a method for making the above-mentioned red mud into a form that is easy to handle, and the gist thereof is to
Red mud cake with a water content of around 30% will not flow uniformly due to the high water content, but granules will form and grow, and at the stage when growth is almost complete, granules are added while adding ash discharged from a coal-fired fluidized bed boiler. That's true. That is, in the present invention, by adding the discharged ash of a coal-fired fluidized bed boiler to the granule surface of the granulation formation gap to the excess cake of red mud slurry, the discharged ash is contained in the discharged ash.
The evaporation of water on the surface of the granules due to the heat generated by the slaked reaction of CaO, the hardening effect due to the adsorption of red mud, the water absorption effect on the surface of the red mud grains by most of the fine ash, and the coating effect on the surface of the granules. Since it forms a strong shell and can be made into solid granules without adhesion, the conventional problems have been completely solved. An embodiment of the present invention will be described below. The red mud slurry discharged from the alumina manufacturing process was superconcentrated to 29.3% by weight of attached moisture using a press filter to obtain a red mud cake consisting of particles having the particle size distribution shown in Table 1. This red mud cake was processed using a dish-shaped granulator with an inner diameter of 5.0 m and a depth of 1.05 m, operated at 6.4 rpm and an inclination angle of 49°, and a coal-fired fluidized bed boiler with a concentration of 15% by weight based on the amount of red mud supplied was produced. Ash was added and granulated. The discharged ash added in this case was added so as to be mixed with the red mud just before the red mud was granulated and taken out from the granulator. When the ash discharged from a coal-fired fluidized bed boiler is added just before the end of granulation, red mud cake with a considerably higher moisture content than 18 to 20% by weight is used, so these powders are added from the early stage of granulation. However, if the discharged ash is added at the stage when the granules are generated and grown and the growth is almost completed, a small amount can be added. This is because a strong shell is efficiently formed on the surface of the grain. Next, a crushing test was conducted on the granules thus granulated, and a steel ball weighing 438 g was
The number of times it was dropped from a position of 10 mm until it broke was measured. The number of falls until crushing of the red mud granules to which the ash discharged from the coal-fired fluidized bed boiler was added was similarly determined for the red mud granules to which lime factory dust was added.
Shown in the table. A large number of times means a high curing strength. In the present invention, red mud slurry containing a large amount of water is usually kept as a red mud cake with a water content (25 to 35% by weight) that can be easily achieved industrially, and then heated to reduce the water content below that level. It is made strong and adheres to storage containers such as hoppers by the simple operation of adding the above-mentioned discharged ash, such as discharged ash from a coal-fired fluidized bed boiler, just before the completion of granulation, without using any means such as adding dehydrating agents. It can be made into a granulated product without any problems. As described above, according to the present invention, red mud, which is difficult to handle, can be made into non-adhesive and strong granules, which makes it easy to handle when used for various purposes afterwards. Note that the granulation used in the present invention is not limited to rolling granulation, and may be vibration granulation.
【表】【table】
Claims (1)
ラリを過濃縮し、得られた含水赤泥ケーキを造
粒機で造粒し、該造粒工程の粒体の成長がほぼ終
了した段階で石炭焚き流動床ボイラの排出灰を添
加して混合し、粒体の表面に強固な殻を形成する
ことを特徴とする赤泥ケーキの造粒方法。1 The red mud slurry discharged from the aluminum production process is overconcentrated, the obtained water-containing red mud cake is granulated using a granulator, and when the growth of the granules in the granulation process is almost completed, coal-fired fluidization is carried out. A method for granulating red mud cake, which is characterized by adding and mixing ash discharged from a bed boiler to form a strong shell on the surface of the granules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58193859A JPS6086021A (en) | 1983-10-17 | 1983-10-17 | Granulation of red mud cake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58193859A JPS6086021A (en) | 1983-10-17 | 1983-10-17 | Granulation of red mud cake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6086021A JPS6086021A (en) | 1985-05-15 |
| JPS644969B2 true JPS644969B2 (en) | 1989-01-27 |
Family
ID=16314937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58193859A Granted JPS6086021A (en) | 1983-10-17 | 1983-10-17 | Granulation of red mud cake |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6086021A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03117178U (en) * | 1990-03-14 | 1991-12-04 | ||
| CN110482821A (en) * | 2019-08-13 | 2019-11-22 | 昆明理工大学 | The circulating water type dealkalize system and dealkalization method of a kind of sulfur-bearing tailing to red mud |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500592A (en) * | 2011-09-16 | 2012-06-20 | 茌平县信发盛吉赤泥处理有限公司 | Method for comprehensively utilizing alumina red mud |
-
1983
- 1983-10-17 JP JP58193859A patent/JPS6086021A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03117178U (en) * | 1990-03-14 | 1991-12-04 | ||
| CN110482821A (en) * | 2019-08-13 | 2019-11-22 | 昆明理工大学 | The circulating water type dealkalize system and dealkalization method of a kind of sulfur-bearing tailing to red mud |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6086021A (en) | 1985-05-15 |
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