JPS5830382A - Treatment for dust - Google Patents
Treatment for dustInfo
- Publication number
- JPS5830382A JPS5830382A JP56128637A JP12863781A JPS5830382A JP S5830382 A JPS5830382 A JP S5830382A JP 56128637 A JP56128637 A JP 56128637A JP 12863781 A JP12863781 A JP 12863781A JP S5830382 A JPS5830382 A JP S5830382A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- water
- dust
- components
- molten slag
- 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
- 239000000428 dust Substances 0.000 title claims abstract description 37
- 239000002893 slag Substances 0.000 claims abstract description 54
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 21
- 238000002844 melting Methods 0.000 claims abstract description 16
- 230000008018 melting Effects 0.000 claims abstract description 16
- 239000002699 waste material Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011780 sodium chloride Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000003672 processing method Methods 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 2
- 229910052681 coesite Inorganic materials 0.000 claims 1
- 229910052906 cristobalite Inorganic materials 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 239000002689 soil Substances 0.000 claims 1
- 229910052682 stishovite Inorganic materials 0.000 claims 1
- 229910052905 tridymite Inorganic materials 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 10
- 239000002737 fuel gas Substances 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 150000003839 salts Chemical class 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 2
- 230000008929 regeneration Effects 0.000 abstract description 2
- 238000011069 regeneration method Methods 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- -1 NaCl Chemical class 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 108091006629 SLC13A2 Proteins 0.000 description 1
- 239000007798 antifreeze agent Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000010102 embolization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 210000000003 hoof Anatomy 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000011555 saturated liquid Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Gasification And Melting Of Waste (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【発明の詳細な説明】 本発明はダストの処理方法に関するものである。[Detailed description of the invention] The present invention relates to a dust processing method.
更に詳しくは、電気集塵機で捕捉した廃棄物焼却炉、例
えば都市ゴミ焼却炉から発生するダストの処理方法に係
わるものである。More specifically, the present invention relates to a method for treating dust generated from a waste incinerator, such as a municipal garbage incinerator, which is captured by an electrostatic precipitator.
都市ゴミ、下水汚泥、鉱山や１川などから排出される廃
水の処理物等の各種廃棄物は焼却炉により焼却され、生
じた煉却灰は従来埋立などによシ処理されていた。しか
し埋立用地の確保の困難性の問題、含有される有害重金
属類が地中に溶出し埋立用地周辺を汚染して二次公害を
引起す恐れがあることなどから、最近では、例えばベー
スメタルを用いた電気アーク炉や直接通電式溶融処理炉
などにより溶融処理して固化する方法が祈案されている
。上記焼却炉によシ廃棄物を焼却する場合、発生する粉
塵（ダスト）は大気を汚染するので、湿式集塵機、電気
集塵機、バッグフィルターその他の各種型式の集塵装置
で捕捉されるが、例えば、電気集塵機で捕捉したダスト
中にはＮａＣ１、ＫＣＩのような水溶性の塩類とＣａＯ
、Ｓ ｉ Ｏ２、Ａｌ ｕ Ｏａ ＋Ｆｅ２０Ｂのよう
な水に不溶性の酸化物、およびＡｓ＋Ｃｒ＋ Ｚｎ ｒ
Ｃｄ 、Ｐ ｂ ｒ Ｔｌ：ｇのような重金属類が含
捷れており、この重金属類は一般にハロゲン化物または
硫酸塩といった水に可溶性の形態のものが多い。Various wastes such as municipal garbage, sewage sludge, and treated wastewater discharged from mines and rivers are incinerated in incinerators, and the resulting ash has conventionally been disposed of in landfills. However, due to problems such as the difficulty in securing land for landfills and the fear that the harmful heavy metals contained in them may leach into the ground and contaminate the area around the landfill site, causing secondary pollution, for example, base metals have been Methods of melting and solidifying using an electric arc furnace or a direct current melting furnace have been proposed. When waste is incinerated in the above-mentioned incinerator, the generated dust pollutes the atmosphere, so it is captured by various types of dust collectors such as wet dust collectors, electric dust collectors, bag filters, etc. The dust captured by the electrostatic precipitator contains water-soluble salts such as NaCl and KCI and CaO.
, S i O2, water-insoluble oxides such as Al u Oa + Fe20B, and As+Cr+ Zn r
It contains heavy metals such as Cd and P b r Tl:g, and these heavy metals are generally in water-soluble forms such as halides or sulfates.
口たがってこのダストをその！！ま埋立地に埋めたので
は重金属類が地中へ溶出する恐れがあるので、やはり焼
却灰と同様、溶融処理して固化する方法がとられる。本
発明者等は焼却炉による廃棄物の焼却中に発生するダス
トの溶融処理につき種々検討したととろ、ダストを直接
通電式溶融処理炉によシ溶融処理する際、生成する溶滓
は上層と下層とが組成を異にしておシ、別個に出滓する
ことによりそれぞれの特性に応じた有効利用が可能でし
かも重金属類は無害化されることを見出し本発明に到達
した。すなわち本発明は廃棄物焼却炉から発生するダス
トを上下二段に溶滓排出口をそなえた直接通電式溶融処
理炉で処理し、生成した溶滓を水に可溶性成分を主体と
する上層の溶滓と、水に不溶性の成分を主体とする下層
の溶滓とに分別出滓することを特徴とするダストの処理
方法を要旨とするものである。That dust is so tantalizing! ! If buried in a landfill, there is a risk that heavy metals will leach into the ground, so the same method used for incineration ash is to melt and solidify it. The present inventors have conducted various studies on the melting process of dust generated during the incineration of waste in an incinerator, and found that when the dust is melted in a direct energized melting furnace, the slag generated is divided into upper and lower layers. The present invention was achieved by discovering that by having different compositions and extracting the sludge separately, it is possible to use them effectively according to their characteristics, and the heavy metals are rendered harmless. That is, the present invention processes dust generated from a waste incinerator in a direct current melting furnace equipped with upper and lower slag discharge ports, and converts the generated slag into an upper layer containing mainly water-soluble components. The gist of the present invention is a method for treating dust, which is characterized by separating the slag into a slag and a lower layer slag mainly composed of components insoluble in water.
以下本発明を、本発明の適用される装置の一例を示す図
面に基づいて説明する。The present invention will be described below based on drawings showing an example of an apparatus to which the present invention is applied.
第１図は直接通電式溶融処理炉の断面略図で、炉本体は
例えばＺｒＯｓの含有量の多いＳ ｉ Ｏｅ−Ａｌ ２
０８−Ｚｒ（ｈ系の耐火材料（］）により密閉構築され
ており、とれには廃棄物の焼却時に発生１７だダストの
投入口（２）、排気管（３）、没入したダストの初期溶
融のだめの加熱装ｆｉｆｆ例えば燃料ガス噴射ノズル（
４）、水平方向に出没自在な電極（５） （５）、上段
の溶滓排出口（６）、下段の溶滓排出口（７）などが設
けられている。なおこの２つの排出口（６） （７）は
炉体構造の許容範囲でなるべく落差をつけて設けらルる
」−記電極（５） （５）は電圧調整用電源トランス（
８）を通して交流電流が流され、ダストの投入口（２）
から投入されたダストが前記燃料ガス噴射ノズル（４）
からのガス加熱によシ溶融して、生成した溶滓（９）自
体が導体となシ、これにジーール熱を発生させ、内部加
熱により溶融状態を保持させる機能をなすものである。FIG. 1 is a schematic cross-sectional view of a direct current melting furnace.
It is hermetically constructed with 08-Zr (h-based refractory material ()), and includes the dust inlet (2), the exhaust pipe (3), and the initial melting of the immersed dust. Nodame's heating equipment fiff, for example, fuel gas injection nozzle (
4), an electrode (5) that can be freely retracted in the horizontal direction, an upper slag discharge port (6), a lower slag discharge port (7), etc. are provided. These two discharge ports (6) and (7) should be installed with as much head difference as possible within the allowable range of the furnace structure.
An alternating current is passed through the dust inlet (2).
The dust injected from the fuel gas injection nozzle (4)
The molten slag (9) itself becomes a conductor, generates Geel heat, and maintains the molten state by internal heating.
その材料の代表例としてはモリブデン電極が、また他の
例として黒鉛、鉄、酸化スズ、タングステン電極などが
あげられる。A typical example of the material is a molybdenum electrode, and other examples include graphite, iron, tin oxide, and a tungsten electrode.
本発明は廃棄物例えば都市ゴミ、下水汚泥、鉱山や工場
排水の処理物等の焼却の際、発生するダスト、特に塩類
を多く含む廃棄物からのダストの処理に適用される。し
かして本発明は、直接通電式溶融処理炉のような無酸化
溶融の可能な処理炉で」二記のようなダストを溶融した
場合、生成する溶滓ではその上層部の組成はダスト中の
ＮａＣ１゜ＫＣｌのような水に可溶性成分が主体で比重
は１．９〜２．１あυ、まだ下層部はＣａＯ、５ｉｎｓ
、 Ａ１２０Ｂ 。The present invention is applied to the treatment of dust generated during the incineration of waste such as municipal garbage, sewage sludge, treated mine and industrial wastewater, etc., particularly dust from waste containing a large amount of salts. Therefore, the present invention provides that when dust as described in 2 is melted in a processing furnace capable of non-oxidizing melting such as a direct current melting processing furnace, the composition of the upper layer of the generated slag is different from that of the dust. Mainly composed of water-soluble components such as NaCl1゜KCl, with a specific gravity of 1.9 to 2.1A, and the lower layer is CaO, 5ins
, A120B.
Ｆ ｅ ２０ ｓのような水に難溶性成分が主体で比重
は２．５〜２．７あるという知見に基づき、それぞれを
」；下二段に設けた炉本体の排出口から別個に出滓する
もので、これによシ後記する出滓後の有効利用のだめの
処理かやシ易くなるという効果を奏するものである。な
お含有される重金属類は処理中金属元素まで還元される
か、硫化物の形に変化し、上層部のＮａＣ１、ＫＣＩ
などの水に可溶性成分を主体とする溶滓中にも、下層部
のＣａＯ、５ｆＯａ ＋ＡＩ ２０ｓ ＋ Ｆｅ ２０
Ｂなどの水に難溶性成分を主体とする溶滓中にも溶出し
ない安全無害の形態となる。Based on the knowledge that water-insoluble components such as F e 20 s are the main components and have a specific gravity of 2.5 to 2.7, each slag was discharged separately from the outlet of the furnace body provided in the lower two stages. This has the effect of making it easier to dispose of the slag before its effective use, which will be described later. In addition, the heavy metals contained are reduced to metal elements during the treatment, or change to the form of sulfides, and the upper layer NaCl, KCI
CaO in the lower layer, 5fOa + AI 20s + Fe 20
It is a safe and harmless form that does not dissolve into the slag, which is mainly composed of poorly water-soluble components such as B.
本発明によシ、第１図の直接通電式溶融処理炉を用い廃
棄物焼却炉で発生したダストを処理するには、該ダスト
をダスト投入口（２）よシ炉本体へ入れて、初期溶融用
の燃料ガス噴射ノズル（４）よりガス加熱して、溶１、
鎖状態とし、溶滓（９）を形成させる。According to the present invention, in order to treat dust generated in a waste incinerator using the direct current melting furnace shown in FIG. 1, the dust is introduced into the furnace body through the dust inlet (2), Gas is heated from the fuel gas injection nozzle (4) for melting, and melt 1,
It is made into a chain state and a slag (9) is formed.
との場合の溶滓（９）の温度は投入したダストの種類に
もよるが、およそ１２００〜１３５０℃の範囲である。The temperature of the slag (9) in this case is in the range of about 1200 to 1350°C, although it depends on the type of dust introduced.
その際、炉本体に取付けである電１ｉ＠ （５） （５
）を予め溶滓中に没入させ交流電流を通し、これを導体
として発生するジュール熱により溶融状態を維持させる
。このときの電流は投入したダストの性質にもよるが、
およそ７００〜１２００Ｔ借’／を被処理物の範囲であ
る。なおα０は順次投入されるダストの未溶融状態のカ
バリング層である。At that time, the electric 1i @ (5) (5
) is immersed in the slag in advance and an alternating current is passed through it, and the molten state is maintained by the Joule heat generated by using it as a conductor. The current at this time depends on the nature of the injected dust, but
The range of workpieces is approximately 700-1200T. Note that α0 is an unmelted covering layer of dust that is sequentially introduced.
次に生成した溶滓（９）の上層部を炉本体に設けられた
２つの排出口のうち、高い位置に設けられた排出口（６
）から出滓させ、水を満たしたビット（図示せず）に放
出する。これによシ主成分のＮａＣｌ ＴＫＣＩといっ
た塩類は水に溶出する０また溶滓（９）のＣａＯ、Ａｌ
ｚＯｓ ｒ ５ｉＯｚ ｒ Ｆｅ２０ｓ すどの水に難
溶性成分を主体とする下層部を炉本体に設けられた２つ
の排出口のうち、低い位置に設けられる溶ｒ名排出口（
７）から出滓させ、無害化された重金属類と共に搬送固
化させる。Next, the upper layer of the generated slag (9) is removed from the outlet (6) located at the higher position of the two outlets provided in the furnace body.
) and discharge into a water-filled bit (not shown). As a result, salts such as NaCl, TKCI, which are the main components, are dissolved in water, and CaO and Al in the slag (9) are dissolved in water.
zOs r 5iOz r Fe20s The lower layer, which mainly contains poorly soluble components in the throat water, is removed from the melt outlet (which is located at the lower position of the two outlets provided in the furnace body).
7), and transported and solidified together with detoxified heavy metals.
前記の溶滓排出口（６）よシ出滓させた上層部の溶滓は
水中に放出したときに主成分のＮａＣ１、ＫＣＩなどの
塩類が溶出するので一部混入してくる水に不溶性の成分
（ＣａＯ、Ｓｉｎｇ ＋ ＡＩＢＯＢ 、 Ｆｅｚｅｓ
など）を沢別除去した上で、廃棄物焼却炉から得ら
れる廃熱等を利用して濃縮し、溶解度の温度依存性の違
い等を利用して、ＮａＣ１、ＫＣＩ 等に分別し、例オ
ーばカリ肥料、Ｎａ０Ｔ−Ｉ製造用原料、起塞剤や凍結
防止剤などに再生利用される。また排出口（７）から出
滓された溶滓は固化されたのち砂などの細骨材として再
生利用される。When the upper layer of the slag discharged from the slag discharge port (6) is discharged into water, the main components of salts such as NaCl and KCI will be eluted, so some of the insoluble slag will be mixed into the water. Ingredients (CaO, Sing + AIBOB, Fezes
etc.), then concentrated using waste heat obtained from a waste incinerator, and separated into NaCl, KCI, etc. using the temperature dependence of solubility, etc. It is recycled as a potash fertilizer, raw material for NaOT-I production, embolization agent, antifreeze agent, etc. Further, the slag discharged from the discharge port (7) is solidified and then recycled as fine aggregate such as sand.
以上のべたように、本発明は廃棄物焼却炉から下層部に
分割出滓することを特徴とするものであシ、これにより
溶滓の爾後の有効再生を容易にすると共に、ダスト中に
含有される重金属類の無害化をはかるもので、廃棄物の
処理および再生事業に寄与するところ大なるものがある
。As described above, the present invention is characterized by separating the slag from the waste incinerator into the lower layer, which facilitates the subsequent effective regeneration of the slag, and also allows the slag to be contained in the dust. This technology aims to detoxify the heavy metals used in waste, and will greatly contribute to waste treatment and recycling projects.
実施例１
都市ゴミ焼却炉から発生する粉塵を電気集１１Ｓ機で捕
捉し、第１表に示す組成からなるダストをイ！また○
第１表
註１．欄外の（ト）は埋立基準値である。Example 1 Dust generated from a municipal waste incinerator is captured by an electric collector 11S, and the dust having the composition shown in Table 1 is collected. Also ○ Table 1 Note 1. (G) outside the margin is the landfill standard value.
註２０重金属類の溶出試験は環境庁告示第１４号によっ
た。Note 20 The elution test for heavy metals was conducted in accordance with Environment Agency Notification No. 14.
次に第１表のうち試料１を第１図に示す直接通電式溶融
処理炉により溶融処理し、溶滓排出口（６）から出滓し
た上層部の溶滓Ａ、粋よび溶滓排出口（７）′から出滓
した下層部の溶滓Ｂについてそれぞれの組成を調査した
結果を第２表に示す。Next, sample 1 in Table 1 was melted in the direct current melting furnace shown in Figure 1, and the slag A, slag, and slag in the upper layer discharged from the slag discharge port (6) were melted. Table 2 shows the results of investigating the composition of each of the lower layer slag B from (7)'.
＄ ２表
以上の結果から」一層部の溶滓は水に可溶性の成分（Ｎ
ａＣ１，、ＫＣ１々ど）が主体で；し）るのに対し、下
層部の溶滓は水に難溶性の成分（ＣａＯ、Ａ １２０ｎ
）Ｓｉｎｓ 、 Ｆｅ２０ａなど）であるととが四囲
らかであ実施例２
実施例１によって得られた、第１図に示す直接通電式溶
融処理炉の溶滓排出口（６）よシ出滓された主成分がＮ
ａＣ１、ＫＣＩ などからなる上層部の溶滓から第２
図に示すフローに従ってＫＣＩおよびＮａＣ１を回収し
た。From the results shown in Table 2, the slag in the first layer contains water-soluble components (N
aC1, KC1, etc.), whereas the slag in the lower layer contains components that are poorly soluble in water (CaO, A120n, etc.).
) Sins, Fe20a, etc.) and the edges are square.Example 2 Slag obtained in Example 1 from the slag discharge port (6) of the direct current melting furnace shown in FIG. The calculated principal component is N
The second layer from the upper layer of slag consisting of aC1, KCI, etc.
KCI and NaCl were collected according to the flow shown in the figure.
すなわち、ＮａＣ１を飽和させ１０５〜１１０℃に加熱
した水溶液（１１を渦だした溶解槽０→内に、」二記溶
滓をライン０υから投入し溶解攪拌した。水溶液０３の
加熱は廃棄物焼却炉から発生する廃熱を利用した蒸気を
用いた。との場合、溶滓中のＫＣＩの水に対する溶解度
はＮａＣ１より犬でＫＣＩは充分溶解した。これを移送
ポンプ（１４）により配管００を通して、冷却槽θゆへ
送シ、冷却水、又はプライン冷却（１１）
により約１０℃まで冷却した。この温度ではＫＣＩの方
がＮａＣ１よりも水に対する溶解度が小さく、ｒ（Ｃ１
が析出するので分離機例えば遠心分＃、機（１７＞で分
離し、純度が６０〜７０ＸのＫＣｌが回収された。That is, into the dissolving tank 0 → which had saturated NaCl and heated to 105 to 110°C, the slag described above was introduced from line 0υ and dissolved and stirred. Steam using waste heat generated from the furnace was used. In this case, the solubility of KCI in water in the slag was higher than NaCl, and KCI was sufficiently dissolved. This was passed through pipe 00 by a transfer pump (14). It was cooled to about 10°C by sending it to a cooling tank θ, using cooling water, or by prine cooling (11).At this temperature, KCI has a lower solubility in water than NaCl, and r(C1
was precipitated, so it was separated using a separator, such as a centrifuge #17, and KCl with a purity of 60 to 70X was recovered.
結晶−母液はＮａＣ］ 、 ＫＣＩ の飽和液であシ移
送ポンプ（′ｌυによシ配管Ｑりを通して蒸気加熱装置
（転）によシ加熱し前記溶解槽＠へ循環使用する。なお
、溶解槽０蹄では）（Ｃ１を含むＮａＣ１が沈積するの
で随時抜き出し口（２１＞より抜出し回収した。The crystal-mother liquor is a saturated liquid of NaC], KCI, heated by a steam heating device (transfer) through a transfer pump ('lυ) and pipe Q, and circulated to the above-mentioned dissolving tank. For hoof 0) (NaC1 containing C1 was deposited, so it was extracted and collected from the extraction port (21) at any time.
第１図は本発明方法の適用される直接通電式溶融処理炉
の一例を示す断面略図、第２図は実施例２の回収操作を
説明するフローシートである。
１・・・胴太材料 ２・・・ダスト投入口３・・・
排気管
４・・・燃料ガス、噴射ノズル
５・・・電極 ６，７・・・溶滓排出口８・・
・電源トランス ９・・・溶滓
１０・・・カバリング槽 １２・・・溶解槽１．４ 、
１８・・・移送ポンプ １６・・・冷却槽（１２）
１７・・・遠心分離機 ２０・・・蒸気加熱装置２１・
・・抜出し口
代理人 弁理士 足 立 勉FIG. 1 is a schematic cross-sectional view showing an example of a direct current melting furnace to which the method of the present invention is applied, and FIG. 2 is a flow sheet explaining the recovery operation of Example 2. 1...Thick body material 2...Dust inlet 3...
Exhaust pipe 4...Fuel gas, injection nozzle 5...Electrode 6, 7...Slag discharge port 8...
・Power transformer 9...Slag 10...Covering tank 12...Dissolution tank 1.4,
18... Transfer pump 16... Cooling tank (12) 17... Centrifugal separator 20... Steam heating device 21.
・・Exit agent Tsutomu Adachi, patent attorney
Claims (1)
排出口をそなえた直接通電式溶融処理炉で処理し、生成
した溶滓を水に可溶性成分を主体とする上層の溶滓と水
に難溶性の成分を主体とする下層の溶滓とに分別出滓す
ることを特徴とするダストの処理方法。 ２ 土層の溶滓が、ＫＣＩまたはＮａＣ１を主体とする
水に可溶性成分よりなり下層の溶滓が、Ｃａ０−Ａｌ２
Ｏ２・Ｆｅ２Ｏ８・ＳｉＯ２を主体とする水に難溶性成
分よシなる特許請求の範囲第１項記載のダストの処理方
法。[Scope of Claims] 1 Dust generated from a waste incinerator is treated in a direct current melting furnace equipped with upper and lower slag discharge ports, and the generated slag is mainly composed of water-soluble components. A dust processing method characterized by separating and extracting slag into an upper layer of slag and a lower layer of slag mainly consisting of components hardly soluble in water. 2 The slag in the soil layer is composed of water-soluble components mainly KCI or NaCl, and the slag in the lower layer is composed of Ca0-Al2.
The method for treating dust according to claim 1, which comprises a poorly water-soluble component mainly consisting of O2.Fe2O8.SiO2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56128637A JPS5830382A (en) | 1981-08-17 | 1981-08-17 | Treatment for dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56128637A JPS5830382A (en) | 1981-08-17 | 1981-08-17 | Treatment for dust |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5830382A true JPS5830382A (en) | 1983-02-22 |
| JPS6351755B2 JPS6351755B2 (en) | 1988-10-14 |
Family
ID=14989734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56128637A Granted JPS5830382A (en) | 1981-08-17 | 1981-08-17 | Treatment for dust |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5830382A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61176408A (en) * | 1985-01-31 | 1986-08-08 | Kubota Ltd | Composite ring roll |
| JPS6284217A (en) * | 1985-10-08 | 1987-04-17 | Agency Of Ind Science & Technol | Glass melting furnace |
| JPH0299184A (en) * | 1988-10-04 | 1990-04-11 | Daido Steel Co Ltd | Treatment method for making dusts containing heavy metals harmless |
-
1981
- 1981-08-17 JP JP56128637A patent/JPS5830382A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61176408A (en) * | 1985-01-31 | 1986-08-08 | Kubota Ltd | Composite ring roll |
| JPH0379083B2 (en) * | 1985-01-31 | 1991-12-17 | Kubota Kk | |
| JPS6284217A (en) * | 1985-10-08 | 1987-04-17 | Agency Of Ind Science & Technol | Glass melting furnace |
| JPH0574437B2 (en) * | 1985-10-08 | 1993-10-18 | Kogyo Gijutsuin | |
| JPH0299184A (en) * | 1988-10-04 | 1990-04-11 | Daido Steel Co Ltd | Treatment method for making dusts containing heavy metals harmless |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6351755B2 (en) | 1988-10-14 |
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