JPS62268883A - Soda recovery method - Google Patents
Soda recovery methodInfo
- Publication number
- JPS62268883A JPS62268883A JP11334086A JP11334086A JPS62268883A JP S62268883 A JPS62268883 A JP S62268883A JP 11334086 A JP11334086 A JP 11334086A JP 11334086 A JP11334086 A JP 11334086A JP S62268883 A JPS62268883 A JP S62268883A
- Authority
- JP
- Japan
- Prior art keywords
- iron oxide
- causticizing
- fluidized bed
- waste liquid
- nacl
- 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
- 238000000034 method Methods 0.000 title claims description 34
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims description 12
- 238000011084 recovery Methods 0.000 title claims description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 60
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 42
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 31
- 238000009993 causticizing Methods 0.000 claims description 24
- 239000011780 sodium chloride Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 17
- 239000002699 waste material Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 229910001868 water Inorganic materials 0.000 claims description 15
- 239000012717 electrostatic precipitator Substances 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 14
- 239000011734 sodium Substances 0.000 claims description 13
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 11
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- 239000012256 powdered iron Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 239000007800 oxidant agent Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010411 cooking Methods 0.000 description 4
- 238000003809 water extraction Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000005469 granulation Methods 0.000 description 3
- 230000003179 granulation Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000000374 eutectic mixture Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910000462 iron(III) oxide hydroxide Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012254 powdered material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- -1 sintered ore Chemical class 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
Landscapes
- Paper (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、バルブ蒸解廃液（黒液ともいう）から酸化鉄
を苛性化剤として苛性ソーダを回収する直接苛性化法流
動床方式において、不純物を除去する方法、詳しくは集
しん機捕集物を冷水抽出し、ＮａＣｌ含有−廃液を系外
に排出することにより、ＮａＣｌを系内に蓄積させない
ようにしたソーダ回収方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a direct causticizing fluidized bed system in which caustic soda is recovered from valve cooking waste liquor (also referred to as black liquor) using iron oxide as a causticizing agent. The present invention relates to a method of removing soda, in particular, a method of recovering soda in which NaCl is prevented from accumulating in the system by extracting the collected material with cold water and discharging the NaCl-containing waste liquid out of the system.
従来、木材チップを蒸解したときに発生するバルブ蒸解
廃液（以下、バルブ廃液という）から苛性ソーダを回収
する場合、石灰法が実用化されている。しかしこの石灰
法は工程が複雑であり、また廃物を生しるので臭気対策
、排水対策が必要であリ、苛性化率が悪いなどの欠点を
有していた。Conventionally, the lime method has been put into practical use when recovering caustic soda from bulb cooking waste liquid (hereinafter referred to as bulb waste liquid) generated when wood chips are digested. However, this lime method has drawbacks such as a complicated process, the production of waste, which requires measures against odor and drainage, and a poor causticization rate.
これらの欠点を解消するために、特公昭５１−１２７２
４号公報に示されるように、繊維素物質の蒸解および漂
白工程より排出される実質的に硫黄化合物を含まないア
ルカリ廃液を、濃縮後酸化鉄を加えて燃焼せしめ、得ら
れた鉄酸ソーダ（鉄酸ナトリウム）を水中に投入して抽
出水溶液として直接苛性ソーダを回収するとともに、抽
出残渣として得られた酸化鉄を循環再使用する方法が提
案されている。In order to eliminate these shortcomings, the
As shown in Publication No. 4, the alkaline waste liquid substantially free of sulfur compounds discharged from the process of cooking and bleaching cellulose materials is concentrated, then combusted with the addition of iron oxide, resulting in sodium ferrate ( A method has been proposed in which caustic soda is directly recovered as an extracted aqueous solution by pouring sodium ferrate) into water, and the iron oxide obtained as an extraction residue is recycled and reused.
この方法では、アルカリ廃液からの苛性ソーダの生成は
、おそらく廃液の燃焼によって廃液中に含まれていた有
機物は分解し、生成物として得られた炭酸ソーダおよび
／または酸化ソーダが下記の（１）式および（２）式の
如く酸化鉄と反応して鉄酸ソーダを生成し、これを水中
で処理することによって（３）式の如く、苛性ソーダと
酸化鉄が得られるものと考えられる。In this method, the generation of caustic soda from alkaline waste liquid is probably caused by the combustion of the waste liquid, which decomposes the organic matter contained in the waste liquid, and the soda carbonate and/or soda oxide obtained as a product is expressed by the following formula (1). It is thought that sodium ferrate is produced by reacting with iron oxide as shown in equation (2), and by treating this in water, caustic soda and iron oxide are obtained as shown in equation (3).
Ｎａ２ＣＯｉ＋ＦｅｚＯ１−ｏＮａｚＦｅｚｏｔ＋ｃｏ
、 （１）ＮａｔＯ＋Ｆｅ２０ｔ→ＮａＪｅｚＯｅ
（２１ＮａＪｅｔＯ＊ ＋ ８２０→２Ｎ
ａＯＨ＋ ＦｅｚＯ＊ （３１しかし上記の方法を
流動床炉に適用するにあたり、直接苛性化法では、酸化
鉄（鉄鉱石）は再生循環使用するのが大原則であり、集
じん機などのキャリーオーバー分のみ補給する（補給率
は高々数％のオーダーである）、一方、苛性化反応剤で
あると同時に流動層維持剤である粒状鉄鉱石は再生使用
回数の増加に従い、炉内での粉化が増大すること（約１
０％前後は粉化）、その他フィーダーでの鉄鉱石のハン
ドリング、苛性化工程などでも若干粉化が見られる。ま
た流動床方式では基本的に粒状の苛性化剤を使用するた
め、反応モル比Ｆｅ／Ｎａを１．０近くに設定すること
ができず（反応式ｆｉｌ、（２）に示すように等モル反
応）、一方、粉状の苛性化剤では炉内からすぐ飛び出し
てしまい反応の進行が十分期待できないなどの問題があ
った。Na2COi+FezO1-oNazFezot+co
, (1)NatO+Fe20t→NaJezOe
(21NaJetO* + 820→2N
aOH+ FezO* (31 However, when applying the above method to a fluidized bed furnace, the basic principle is to recycle and reuse iron oxide (iron ore) in the direct causticizing method, and to avoid carryover from dust collectors, etc. (The replenishment rate is on the order of several percent at most.) On the other hand, granular iron ore, which is both a causticizing agent and a fluidized bed maintenance agent, is being pulverized in the furnace as the number of recycled uses increases. to increase (approximately 1
(around 0% is powdered), and some powdering is also seen in handling of iron ore in the feeder, causticizing process, etc. In addition, since the fluidized bed method basically uses a granular causticizing agent, it is not possible to set the reaction molar ratio Fe/Na close to 1.0 (equal molar ratio as shown in reaction formula fil, (2)). On the other hand, powdered causticizing agents have the problem that they immediately jump out of the furnace, making it impossible to expect the reaction to proceed sufficiently.
本発明者らは上記の問題点を解決するために、流動床ボ
イラ、サイクロン、電気集しん機で捕集された粉状鉄酸
ソーダを苛性化した後、乾燥し、乾燥した粉状酸化鉄の
一部あるいは全部を黒液をバインダーとして造粒し、再
び粒状物として流動床炉に供給する技術を開発し、特願
昭５８−１６７９２７号（特開昭６０−５９１９０号）
として特許出願している。In order to solve the above problems, the present inventors causticized powdered sodium ferrate collected in a fluidized bed boiler, cyclone, and electrostatic precipitator, and then dried the powdered iron oxide powder. Developed a technology to granulate part or all of it using black liquor as a binder and feed it again as granules to a fluidized bed furnace, and published Japanese Patent Application No. 167927-1983 (Japanese Patent Application No. 59190-1982).
A patent has been applied for.
上記の直接苛性化法は、ＫＰ法に比較して、石灰キルン
を省略し、プロセスの簡略化、省エネルギー化を目↑旨
した優れたプロセスであるが、クローズド化を特徴とす
る点に問題がある。The above-mentioned direct causticizing method is an excellent process that omits the lime kiln and aims to simplify the process and save energy compared to the KP method, but it has a problem in that it is characterized by a closed system. be.
すなわち、製紙プロセスにおいては、木材チップ、工業
用水などにより、蒸解に必要な薬液以外の不純物が入り
込む。ＫＰ法では、ドレフグ、スラッジなどとともに、
不純物は沈澱物として系外に投棄されるのに対し、直接
苛性化法では系がクローズド化されているので、系外か
ら侵入した不純物は、系内で次第にＲｉ縮される傾向に
ある。この内、ＮａＣｌは鉄酸ソーダ生成反応に悪影響
を与える（反応阻害となる）、ＮａｚＣＯｉと低温域に
て溶融する共融混合物をつくり易いなど、直接苛性化法
流動床式に悪影響を与える。That is, in the paper manufacturing process, impurities other than the chemicals necessary for cooking enter the paper due to wood chips, industrial water, and the like. In the KP method, along with Drefugu, sludge, etc.
Impurities are thrown out of the system as precipitates, whereas in the direct causticizing method, the system is closed, so impurities that have entered from outside the system tend to gradually undergo Ri-condensation within the system. Among these, NaCl has an adverse effect on the direct causticizing fluidized bed method, such as having an adverse effect on the sodium ferrate production reaction (reaction inhibition) and easily forming a eutectic mixture that melts with NazCOi in a low temperature range.
本発明は上記の諸点に鑑みなされたもので、ＮａＣｌを
系内に蓄積させないで、一定の値以下にその濃度を制御
し、効率よく苛性ソーダを回収できるようにした方法の
提供を目的とするものである。The present invention has been made in view of the above points, and aims to provide a method for efficiently recovering caustic soda by controlling the concentration of NaCl below a certain value without accumulating it in the system. It is.
〔問題点を解決するための手段および作用〕本願の第１
の発明のソーダ回収方法は、ＮａＣｌを含むバルブ廃液
を、酸化鉄を苛性化剤および流動化媒体とする流動床炉
で燃焼せしめ、ついで生成物である鉄酸ソーダを水中に
投入して苛性ソーダおよび酸化鉄を回収し、流動床炉排
ガスをボイラで熱回収した後、サイクロン、電気集じん
機に導入して集じんする方法において、電気集じん機捕
集物を冷水抽出し、ＮａＣｌ含有廃液を系外に排出し、
粉状酸化鉄を苛性化工程または乾燥工程に導入すること
を特徴としている。[Means and effects for solving the problem] No. 1 of the present application
In the soda recovery method of the invention, valve waste liquid containing NaCl is combusted in a fluidized bed furnace using iron oxide as a causticizing agent and a fluidizing medium, and then the product, sodium ferrate, is poured into water to recover caustic soda and In this method, iron oxide is recovered, heat is recovered from the fluidized bed furnace exhaust gas in a boiler, and then the dust is collected by introducing it into a cyclone or an electrostatic precipitator. Discharge it out of the system,
It is characterized by introducing powdered iron oxide into the causticizing process or drying process.
すなわち、ボイラ後流以降の集じん装置としては、マル
チサイクロンなどのサイクロン、電気集しん機などが用
いられ、煙道捕集粉状鉄酸ソーダのうち、ＮａＣｌ含有
量の最も高い電気集じん８ｇｌ′ｉＩ集物を冷水抽出し
、ＮａＣｌ含有廃液を系外に投棄することにより、系内
にＮａＣｌを蓄積させることなく、流動床方式を好適に
運転することができる。In other words, a cyclone such as a multi-cyclone, an electrostatic precipitator, etc. are used as a dust collector downstream of the boiler, and 8 g of electrostatic precipitator with the highest NaCl content among the powdered sodium ferrate collected in the flue is used. By extracting the 'iI collection with cold water and discarding the NaCl-containing waste liquid outside the system, the fluidized bed system can be suitably operated without accumulating NaCl within the system.
また本願の第２の発明のソーダ回収方法は、ＮａＣｌ含
有量の高い電気集じん機捕集物の全部、およびＮａＣｌ
含有量の高いサイクロン捕集物の一部または全部を冷水
抽出し、ＮａＣｌ含有廃液を系外に排出し、粉状酸化鉄
を苛性化工程または乾燥工程に導入することを特徴とし
ており、これにより系内にＮａＣｌを一部させることな
く、流動床方式を好適に運転することができる。In addition, the soda recovery method of the second invention of the present application recovers all of the electrostatic precipitator collection material having a high NaCl content, and
It is characterized by extracting part or all of the cyclone-collected material with high content with cold water, discharging the NaCl-containing waste liquid outside the system, and introducing powdered iron oxide into the causticizing process or drying process. The fluidized bed system can be suitably operated without partially introducing NaCl into the system.
サイクロン捕集物、電気集じん機捕集物のＮａＣｌの割
合は、通常、重量比で全ソーダ分の１０〜７０％であり
、電気集じん機捕集物では、Ｎａの５０％以上はＮａＣ
ｌの形で含有されている。The proportion of NaCl in the cyclone collection material and electrostatic precipitator collection material is usually 10 to 70% of the total soda content by weight, and in the electrostatic precipitator collection material, 50% or more of Na is NaCl.
It is contained in the form of l.
以下、本発明の実施例を図面に基づいて例示的に詳細に
説明する。ただしこの実施例に記載されている構成機器
の配置などは、とくに特定的な記載がない限りは、それ
らのみに限定するものではなく、単なる説明例にすぎな
い。Embodiments of the present invention will be described in detail below by way of example based on the drawings. However, unless there is a specific description, the arrangement of the component devices described in this embodiment is not limited thereto, and is merely an illustrative example.
希黒液を薄膜式エバポレータ１に導入し、蒸発、濃縮し
て５０〜６０％の黒液とした後、ディスクエバポレータ
２に導入して７０〜８０％の−ａ黒液とし、この濃黒液
を流動床炉３に供給する。一方、流動床炉３に粒状鉄鉱
石貯槽４から粒状酸化鉄を供給する。流動床炉３の層温
度は７００〜１１００℃、望ましくは９００〜１０００
℃とし、Ｆｅ／Ｎａは１．０以上となるようにするｍＲ
動動形形成材しては、純鉄、鉄鉱石（Ｆｅ２ｏｓ、Ｆｅ
３０ｍ）、焼結鉱、還元ペレット、製鉄ダストを造粒し
たものなどの粒状の鉄系の粒状の化合物が用いられる０
本例においては、酸化鉄として鉄鉱石を使用し、補給は
粒状鉄鉱石で行う。５は流動層、６は空気分散板、７は
風箱である。The dilute black liquor is introduced into the thin film evaporator 1, evaporated and concentrated to obtain a 50-60% black liquor, and then introduced into the disk evaporator 2 to obtain a 70-80% -a black liquor. is supplied to the fluidized bed furnace 3. On the other hand, granular iron oxide is supplied to the fluidized bed furnace 3 from the granular iron ore storage tank 4 . The bed temperature of the fluidized bed furnace 3 is 700 to 1100°C, preferably 900 to 1000°C.
°C, and mR so that Fe/Na is 1.0 or more
Dynamic shape forming materials include pure iron, iron ore (Fe2os, Fe
30m), granular iron-based granular compounds such as sintered ore, reduced pellets, and granulated steel dust are used.
In this example, iron ore is used as the iron oxide, and granular iron ore is used for replenishment. 5 is a fluidized bed, 6 is an air distribution plate, and 7 is a wind box.
流動床炉３からの鉄酸ソーダを第１苛性化装置８に導入
して苛性ソーダ水溶液と回収酸化鉄とに抽出、分離し、
この回収酸化鉄を第１乾燥装置１０で燃焼排ガスなどに
より乾燥した後、分級装置１１で粒状酸化鉄と粉状酸化
鉄とに分級し、粒状酸化鉄を粒状鉄鉱石貯槽４に投入し
、一方、粉状酸化鉄を造粒装置１２および粉状酸化鉄貯
槽１３へ供給する。この造粒装置としては、圧縮造粒装
置とするのが好ましい。The ferric acid soda from the fluidized bed furnace 3 is introduced into the first causticizing device 8 and extracted and separated into a caustic soda aqueous solution and recovered iron oxide,
After this recovered iron oxide is dried by combustion exhaust gas etc. in the first drying device 10, it is classified into granular iron oxide and powdered iron oxide in the classifier 11, and the granular iron oxide is charged into the granular iron ore storage tank 4, , the powdered iron oxide is supplied to the granulator 12 and the powdered iron oxide storage tank 13 . This granulation device is preferably a compression granulation device.
一方、ボイラ１４で捕集した粉状捕集物を第２苛性化装
置１５へ導入して苛性ソーダ水溶液と回収酸化鉄とに抽
出、分離し、この回収酸化鉄を第２乾燥装置１６で燃焼
排ガスなどにより乾燥した後、造粒装置１２で黒液をバ
インダーとして造粒して粒状酸化鉄とし鉄鉱石貯槽４へ
投入する。On the other hand, the powdered material collected in the boiler 14 is introduced into the second causticizing device 15 where it is extracted and separated into a caustic soda aqueous solution and recovered iron oxide. After drying, the iron ore is granulated in a granulator 12 using black liquor as a binder to form granular iron oxide, which is then charged into an iron ore storage tank 4.
電気集しん機１８の捕集物の全部、または電気集じん機
１８の捕集物の全部とサイクロン１７の捕集物の一部も
しくは全部とを、冷水抽出装置２０へ供給して冷水抽出
し、ＮａＣｌ含存廃液を系外に排出して系内にＮａＣｌ
が蓄積するのを防止し、冷水抽出後の微細な酸化鉄を第
２苛性化装置１５または第２乾燥装置１６へ導入する。All of the material collected by the electrostatic precipitator 18, or all of the material collected by the electrostatic precipitator 18 and part or all of the material collected by the cyclone 17 is supplied to a cold water extraction device 20 for cold water extraction. , the NaCl-containing waste liquid is discharged outside the system and NaCl is added to the system.
The fine iron oxide after cold water extraction is introduced into the second causticizing device 15 or the second drying device 16.
このように、ＮａＣｌ含有率の最も高い電気集じん機捕
集物は、全量冷水抽出する。サイクロン捕集物は全量冷
水抽出する場合と、一部を冷水抽出する場合と、全量を
冷水抽出しない場合とがある。In this way, the entire amount of the electrostatic precipitator collection material having the highest NaCl content is extracted with cold water. There are cases in which the entire amount of the cyclone-collected material is extracted with cold water, cases in which a portion thereof is extracted with cold water, and cases in which the entire amount is not extracted with cold water.
サイクロン捕集物で冷水抽出しない分は、第２苛性化装
置１５または第２乾燥装置１６へそのまま供給する。The cyclone-collected material that is not extracted with cold water is directly supplied to the second causticizing device 15 or the second drying device 16.
上記のように本発明の方法によれば、ＮａＣｌを系内に
蓄積させないで、一定のレベル以下にその４度をコント
ロールし、苛性化反応を好適に進行させるとともに、酸
化鉄、鉄酸ソーダを流動化媒体とする流動層を、良好な
流動化状態を保つことが可能になるという効果を奏する
。As mentioned above, according to the method of the present invention, NaCl is not accumulated in the system, the NaCl concentration is controlled below a certain level, and the causticizing reaction progresses suitably, while iron oxide and sodium ferrate are removed. This has the effect of making it possible to maintain a good fluidized state of the fluidized bed used as the fluidizing medium.
図面は本発明のソーダ回収方法を実施する装置の一例を
示すフローシートである。
１・・・薄膜式エバポレータ、２・・・ディスクエバポ
レータ、３・・・流動床炉、４・・粒状鉄鉱石貯槽、５
・・・流動層、６・・・空気分散板、７・・・風箱、８
・・・第１苛性化装置、１０・・・第１乾燥装置、１１
・・・分級装置、１２・・・造粒装置、１３・・・粉状
酸化鉄貯槽、１４・・・ボイラ、１５・・・第２苛性化
装賀、１６・・・第２乾燥装置、１７・・・サイクロン
、１８・・電気集しん機、２０・・・冷水抽出値でThe drawing is a flow sheet showing an example of an apparatus for implementing the soda recovery method of the present invention. 1... Thin film evaporator, 2... Disc evaporator, 3... Fluidized bed furnace, 4... Granular iron ore storage tank, 5
... Fluidized bed, 6... Air distribution plate, 7... Wind box, 8
...First causticizing device, 10...First drying device, 11
... Classifying device, 12... Granulation device, 13... Powdered iron oxide storage tank, 14... Boiler, 15... Second causticizing device, 16... Second drying device, 17 ...Cyclone, 18...Electric precipitator, 20...Cold water extraction value
Claims (1)
よび流動化媒体とする流動床炉で燃焼せしめ、ついで生
成物である鉄酸ソーダを水中に投入して苛性ソーダおよ
び酸化鉄を回収し、流動床炉排ガスをボイラで熱回収し
た後、サイクロン、電気集じん機に導入して集じんする
方法において、電気集じん機捕集物を冷水抽出し、Ｎａ
Ｃｌ含有廃液を系外に排出し、粉状酸化鉄を苛性化工程
または乾燥工程に導入することを特徴とするソーダ回収
方法。 ２ ＮａＣｌを含むバルブ廃液を、酸化鉄を苛性化剤お
よび流動化媒体とする流動床炉で燃焼せしめ、ついで生
成物である鉄酸ソーダを水中に投入して苛性ソーダおよ
び酸化鉄を回収し、流動床炉排ガスをボイラで熱回収し
た後、サイクロン、電気集じん機に導入して集じんする
方法において、電気集じん機捕集物の全部、およびサイ
クロン捕集物の一部または全部を冷水抽出し、ＮａＣｌ
含有廃液を系外に排出し、粉状酸化鉄を苛性化工程また
は乾燥工程に導入することを特徴とするソーダ回収方法
。[Claims] 1 Valve waste liquid containing NaCl is combusted in a fluidized bed furnace using iron oxide as a causticizing agent and a fluidizing medium, and then the product, sodium ferrate, is poured into water to dissolve caustic soda and oxidizer. In this method, iron is recovered, fluidized bed furnace exhaust gas is heat recovered in a boiler, and then introduced into a cyclone or an electrostatic precipitator to collect dust.The electrostatic precipitator collected material is extracted with cold water and Na
A soda recovery method characterized by discharging a Cl-containing waste liquid out of the system and introducing powdered iron oxide into a causticizing process or a drying process. 2 Valve waste liquid containing NaCl is combusted in a fluidized bed furnace using iron oxide as a causticizing agent and fluidizing medium, and then the product, sodium ferrate, is poured into water to recover caustic soda and iron oxide, and fluidized. In a method in which bed furnace exhaust gas is heat recovered in a boiler and then introduced into a cyclone or electrostatic precipitator to collect dust, all of the electrostatic precipitator collected material and a part or all of the cyclone collected material are extracted with cold water. and NaCl
A soda recovery method characterized by discharging the contained waste liquid out of the system and introducing powdered iron oxide into a causticizing process or a drying process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61113340A JPH0711114B2 (en) | 1986-05-16 | 1986-05-16 | Soda recovery method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61113340A JPH0711114B2 (en) | 1986-05-16 | 1986-05-16 | Soda recovery method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62268883A true JPS62268883A (en) | 1987-11-21 |
| JPH0711114B2 JPH0711114B2 (en) | 1995-02-08 |
Family
ID=14609763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61113340A Expired - Lifetime JPH0711114B2 (en) | 1986-05-16 | 1986-05-16 | Soda recovery method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0711114B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5522051A (en) * | 1978-08-02 | 1980-02-16 | Tokuyama Soda Kk | Desalting method |
| JPS58132192A (en) * | 1982-01-27 | 1983-08-06 | バブコツク日立株式会社 | Direct caustification using fluidized layer furnace |
| JPS5943186A (en) * | 1982-08-30 | 1984-03-10 | バブコツク日立株式会社 | Combustion of black liquor |
| JPS6081015A (en) * | 1983-10-12 | 1985-05-09 | Babcock Hitachi Kk | Direct causticizing method using fluidized bed |
-
1986
- 1986-05-16 JP JP61113340A patent/JPH0711114B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5522051A (en) * | 1978-08-02 | 1980-02-16 | Tokuyama Soda Kk | Desalting method |
| JPS58132192A (en) * | 1982-01-27 | 1983-08-06 | バブコツク日立株式会社 | Direct caustification using fluidized layer furnace |
| JPS5943186A (en) * | 1982-08-30 | 1984-03-10 | バブコツク日立株式会社 | Combustion of black liquor |
| JPS6081015A (en) * | 1983-10-12 | 1985-05-09 | Babcock Hitachi Kk | Direct causticizing method using fluidized bed |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0711114B2 (en) | 1995-02-08 |
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