JPH081194A - Reduction treatment of sludge containing hexavalent chromium - Google Patents
Reduction treatment of sludge containing hexavalent chromiumInfo
- Publication number
- JPH081194A JPH081194A JP6160705A JP16070594A JPH081194A JP H081194 A JPH081194 A JP H081194A JP 6160705 A JP6160705 A JP 6160705A JP 16070594 A JP16070594 A JP 16070594A JP H081194 A JPH081194 A JP H081194A
- Authority
- JP
- Japan
- Prior art keywords
- hexavalent chromium
- sludge
- rotary kiln
- chromium
- organic substance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000010802 sludge Substances 0.000 title claims abstract description 31
- 239000011651 chromium Substances 0.000 claims abstract description 18
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 24
- 239000000126 substance Substances 0.000 claims description 16
- 238000003672 processing method Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 9
- 239000000203 mixture Substances 0.000 abstract description 6
- 239000003818 cinder Substances 0.000 abstract description 5
- 229920003023 plastic Polymers 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 abstract description 3
- 239000004568 cement Substances 0.000 abstract 1
- 239000000428 dust Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 9
- 238000005979 thermal decomposition reaction Methods 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000010828 elution Methods 0.000 description 3
- 235000003891 ferrous sulphate Nutrition 0.000 description 3
- 239000011790 ferrous sulphate Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000002801 charged material Substances 0.000 description 2
- 238000007922 dissolution test Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- -1 small molecule hydrocarbons Chemical class 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 150000001793 charged compounds Chemical class 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、６価クロムを含む産業
廃棄物および一般廃棄物の処理ならびに汚染土壌の浄化
処理の方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating industrial waste and general waste containing hexavalent chromium and for treating contaminated soil.
【０００２】[0002]
【従来の技術】一般に、６価クロムを含む溶液は、硫酸
第一鉄などの還元剤により６価クロムを３価クロムに化
学還元したのち苛性ソーダなどの中和剤により加水分解
して水酸化クロムとして沈殿させる方法が採られてい
る。2. Description of the Related Art Generally, a solution containing hexavalent chromium is chemically reduced to hexavalent chromium with a reducing agent such as ferrous sulfate and then hydrolyzed with a neutralizing agent such as caustic soda to produce chromium hydroxide. The method of precipitating is adopted.
【０００３】 2NaCrO4 +6FeSO4 + 8H2 SO4 →Cr2 (SO 4 ) 3 +3Fe2 (SO 4 ) 3 + Na2 SO4 +H2 O Cr2 (SO 4 ) 3 + 6NaOH →2Cr(OH) 3 +3Na2 SO4 汚泥の場合は、溶液の場合と同様に、硫酸第一鉄などの
還元剤で化学還元を行う方法が採られている。６価クロ
ムを含む産業廃棄物および一般廃棄物ならびに汚染土壌
（以後「廃棄物など」と称する）の場合も、硫酸第一鉄
などの還元剤により６価クロムを３価クロムに化学還元
する方法が採られている。廃棄物などの場合、６価クロ
ムの他に有機物などが含まれていることが多い。有機物
が含まれている時は、クロムの還元と有機物の分解を行
うことが必要な場合が多い。このような廃棄物などを処
理する場合は、薬剤による還元処理を行ったのち、焼却
して有機物を熱分解する必要がある。６価クロムの還元
と有機物の熱分解を同時に行う方法として、還元ガスを
生成させ、その還元ガスにより、６価クロムを還元する
方法が報告されている（松田政義「汚泥焼却還元装置」
特願昭５２−３９５９１および山田新太郎「クロム分を
含有する汚泥の焼却処理方法」特開昭５１−２２２８
１）。これらの方法では、焼却において還元ガスが生成
する条件を維持する必要がある。2NaCrO 4 + 6FeSO 4 + 8H 2 SO 4 → Cr 2 (SO 4 ) 3 + 3Fe 2 (SO 4 ) 3 + Na 2 SO 4 + H 2 O Cr 2 (SO 4 ) 3 + 6NaOH → 2Cr ( In the case of (OH) 3 + 3Na 2 SO 4 sludge, as in the case of the solution, a method of performing chemical reduction with a reducing agent such as ferrous sulfate is adopted. A method of chemically reducing hexavalent chromium to trivalent chromium with a reducing agent such as ferrous sulfate also in the case of industrial waste and general waste containing hexavalent chromium and contaminated soil (hereinafter referred to as "waste etc.") Is taken. In the case of waste, etc., organic substances are often contained in addition to hexavalent chromium. When organic substances are contained, it is often necessary to reduce chromium and decompose organic substances. When treating such wastes, it is necessary to perform a reduction treatment with a chemical agent and then incinerate it to thermally decompose organic substances. As a method for simultaneously performing the reduction of hexavalent chromium and the thermal decomposition of organic matter, a method of producing a reducing gas and reducing the hexavalent chromium by the reducing gas has been reported (Masayoshi Matsuda “Sludge Incineration and Reduction Equipment”).
Japanese Patent Application No. 52-39591 and Shintaro Yamada "Method for incinerating sludge containing chromium".
1). In these methods, it is necessary to maintain the conditions under which reducing gas is generated during incineration.
【０００４】[0004]
【発明が解決しようとする課題】そこで、本発明は、上
記の従来技術の問題点を解決し、汚泥類に含まれている
６価クロムを１段で還元する処理方法を提供することを
目的とする。SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above problems of the prior art and to provide a treatment method for reducing hexavalent chromium contained in sludge in one stage. And
【０００５】[0005]
【課題を解決するための手段】本発明者は、上記目的を
達成するために鋭意研究した結果、６価クロムを含有す
る汚泥類を有機物と一定の比率で混合し、ロータリーキ
ルンにて焼却することにより６価クロムを還元できるこ
とを見出し、本発明に到達した。Means for Solving the Problems As a result of intensive studies for achieving the above object, the present inventor has found that sludge containing hexavalent chromium is mixed with an organic substance at a certain ratio and incinerated in a rotary kiln. It was found that hexavalent chromium can be reduced by the method, and the present invention has been achieved.
【０００６】ロータリーキルンに、装入された有機物を
主成分とする汚泥はロータリーキルンの回転による転動
により攪拌を受けながら、装入物表面で燃焼が生じてい
る。その燃焼熱により、装入物に含まれている有機物
（炭化水素）は、熱分解を起こし、ガス化した小分子の
炭化水素や一酸化炭素ガスに分解する。小分子の炭化水
素は、さらに、熱分解を起こし、一酸化炭素ガスにまで
分解が進行する。一酸化炭素ガスなどは、装入物表面に
て、空気中の酸素と接触し、ガス燃焼が起こり、二酸化
炭素にまで酸化が進行する。この燃焼熱により新たに装
入された装入物が加熱されて、熱分解→ガス化→燃焼と
進む。このようにして、ロータリーキルンに装入された
有機物は熱分解を起こしているので、ロータリーキルン
内の装入物内は酸素が存在しない状態、つまり、還元状
態となっている。このことは、本発明者等が、空気比２
の状態の焼却処理を行っている時にロータリーキルン内
の装入物直上のガス組成の分析を行った結果、酸素を検
出することができなかったことからも確認することがで
きた。なお、「空気比」の定義は、燃焼に必要な酸素理
論量をロータリーキルンに吹き込んでいる状態を「空気
比１」という。このように、空気比２の空気過剰の状態
で燃焼している装入物の内部が還元状態であることが確
認できたので、この状態の中に６価クロムを含有する汚
泥を装入すると、６価クロムを容易に３価クロムに還元
することが可能である。６価クロムを含有するものは、
粒度の細かいもの、例えば、１ｍｍ程度以下のものであ
れば、容易に還元されることは、推定できるが、塊状の
ものの還元は、困難と考えられる。本発明者等は、ロー
タリーキルン内の装入物の量および滞留時間を、一定の
条件に維持することにより、６価クロムを３価クロムに
還元することができる処理方法を見出した。塊状物の大
きさは、緻密性などにより制限があるが、焼却処理条件
を管理をすることにより５００ｍｍ以下のものについて
は、内部に含まれている６価クロムを３価クロムに還元
できることが確認できた。有機物が含まれる場合は、汚
泥などの焼却と同様に、熱分解によるガス化が起こり、
除去することができる。有機物の含有の有無にかかわら
ず塊状物を含めた６価クロムと含有物を３価クロムに還
元する処理方法を提供するものである。[0006] The sludge containing the organic substance as a main component charged in the rotary kiln is agitated by the rotation of the rotary kiln, and is burned on the surface of the charged material. Due to the heat of combustion, the organic substances (hydrocarbons) contained in the charge undergo thermal decomposition, and decompose into gasified small molecule hydrocarbons and carbon monoxide gas. The small molecule hydrocarbon further undergoes thermal decomposition, and the decomposition proceeds to carbon monoxide gas. Carbon monoxide gas or the like contacts oxygen in the air on the surface of the charged material, gas combustion occurs, and oxidation progresses to carbon dioxide. This combustion heat heats the newly charged charge, and proceeds in the order of thermal decomposition → gasification → combustion. In this way, since the organic substances charged in the rotary kiln have undergone thermal decomposition, the charged substance in the rotary kiln is in a state where oxygen does not exist, that is, in a reduced state. This means that the present inventors
As a result of the analysis of the gas composition directly above the charge in the rotary kiln during the incineration process under the condition of No. 2, it was confirmed that oxygen could not be detected. The "air ratio" is defined as "air ratio 1" when the theoretical amount of oxygen required for combustion is blown into the rotary kiln. In this way, it was confirmed that the inside of the charging material that was burning in an air-excessive state with an air ratio of 2 was in a reduced state. Therefore, when sludge containing hexavalent chromium was charged in this state, It is possible to easily reduce hexavalent chromium to trivalent chromium. Those containing hexavalent chromium are
It can be estimated that if the particle size is small, for example, about 1 mm or less, it can be easily reduced, but it is considered difficult to reduce the lump-shaped particles. The present inventors have found a treatment method capable of reducing hexavalent chromium to trivalent chromium by maintaining the amount of charge and the residence time in a rotary kiln under constant conditions. The size of the agglomerates is limited due to their compactness, etc., but it is confirmed that the hexavalent chromium contained in the inside can be reduced to trivalent chromium for those with a diameter of 500 mm or less by controlling the incineration conditions. did it. When organic matter is contained, gasification due to thermal decomposition occurs, similar to incineration of sludge,
Can be removed. It is intended to provide a treatment method for reducing hexavalent chromium including lumps and inclusions to trivalent chromium regardless of the presence or absence of an organic substance.
【０００７】[0007]
【作用】本発明を６価クロムと有機物を含有する塊状物
を例にあげて処理法を具体的に説明する。The processing method of the present invention will be described in detail by taking a lump containing hexavalent chromium and an organic substance as an example.
【０００８】まず、６価クロムを含有する塊状物は、最
大５００ｍｍにまで破砕する。塊状物の破砕する大きさ
は、塊状物の組成や緻密性により決めるが、概ね、５０
０ｍｍ以下にまで破砕すると良い。所定の大きさに破砕
した塊状物を、有機物を含有する汚泥などに調合する。
有機物汚泥に混合した塊状物は、フィーダーなどにより
ロータリーキルンに装入し、炉内の熱により、有機物の
熱分解が起こり、生成してくる還元性ガスにより６価ク
ロムは３価クロムに還元される。この時のロータリーキ
ルン内の状態は、温度７００℃以上で、空気比が２以下
であれば良い。還元された塊状物を含む焼却灰は、ロー
タリーキルン出口で水により瞬時に冷却される。ロータ
リーキルンから排出された焼却灰は、空気中でゆっくり
冷却すると、還元された３価クロムが、空気中の酸素に
より６価クロムに酸化されるので、好ましくない。よっ
て、水により急速冷却するか、または、酸素を遮断した
状態で冷却する必要がある。First, the lump containing hexavalent chromium is crushed to a maximum of 500 mm. The size of crushed lumps depends on the composition and compactness of the lumps, but it is about 50
It is good to crush it to 0 mm or less. The lumps crushed to a predetermined size are mixed with organic matter-containing sludge and the like.
The lumps mixed with the organic sludge are charged into a rotary kiln by a feeder, etc., and the heat of the furnace causes thermal decomposition of the organic matter, and the reducing gas produced reduces hexavalent chromium to trivalent chromium. . At this time, the inside of the rotary kiln may have a temperature of 700 ° C. or higher and an air ratio of 2 or lower. The incineration ash containing the reduced lumps is instantaneously cooled by water at the rotary kiln outlet. If the incineration ash discharged from the rotary kiln is slowly cooled in air, the reduced trivalent chromium is oxidized to hexavalent chromium by oxygen in the air, which is not preferable. Therefore, it is necessary to perform rapid cooling with water or cooling with oxygen blocked.
【０００９】上記のように本発明により、６価クロムを
含有する汚泥や塊状物をロータリーキルンを用いて３価
クロムに還元することが出来る。As described above, according to the present invention, sludge or lumps containing hexavalent chromium can be reduced to trivalent chromium using a rotary kiln.
【００１０】以下に、実施例により本発明をさらに詳細
に説明する。しかし、本発明の範囲は、以下の実施例に
より制限されるものではない。Hereinafter, the present invention will be described in more detail with reference to Examples. However, the scope of the present invention is not limited by the following examples.
【００１１】[0011]
【実施例１】本発明の、６価クロムを含む汚泥の処理方
法の一例を以下に示す。Example 1 An example of the method for treating sludge containing hexavalent chromium according to the present invention is shown below.
【００１２】６価クロムを含む汚泥２ｔを、廃プラスチ
ックおよび石油タンクスラッジなど１ｔと、均一になる
ように混合したのち、空気比２で、７００℃〜７５０℃
になるように連続運転を行っているロータリーキルンに
装入した。装入した調合物は、ロータリーキルン内に１
５分間滞留させた。ロータリーキルンから排出された燃
えがら（残渣）は、出口部で水中落下させ、冷却した。
装入前の汚泥および冷却後の燃えがらからの６価クロム
の溶出量を表１に示した。なお、溶出量の測定方法は、
「廃棄物の処理および清掃に関する法律」に基づく「産
業廃棄物に含まれる金属等の検定方法」（昭和４８年、
環境庁告示１３号）に定める方法を用いた。2 t of sludge containing hexavalent chromium was uniformly mixed with 1 t of waste plastic and petroleum tank sludge, and then the air ratio was 2 to 700 ° C. to 750 ° C.
It was charged into a rotary kiln that is continuously operated so that Charged compound is 1 in rotary kiln
Let it stay for 5 minutes. The cinder (residue) discharged from the rotary kiln was dropped in water at the outlet to cool it.
Table 1 shows the elution amount of hexavalent chromium from the sludge before charging and the cinder after cooling. The method for measuring the elution amount is
"Testing methods for metals contained in industrial waste" based on the "Waste Disposal and Cleaning Law" (1973,
The method specified in the Environmental Agency Notification No. 13) was used.
【００１３】[0013]
【表１】 [Table 1]
【００１４】表１からもわかるように、汚泥に含まれて
いた６価クロムは、完全に還元されており、無害化でき
た。As can be seen from Table 1, the hexavalent chromium contained in the sludge was completely reduced and could be rendered harmless.
【００１５】[0015]
【実施例２】本発明の６価クロムを含む塊状物の処理方
法の一例を以下に示す。Example 2 An example of a method for treating a lump containing hexavalent chromium of the present invention is shown below.
【００１６】コンクリートに６価クロムがしみ込んだも
の５ｔを最大５００ｍｍに破砕し、廃プラスチックやス
タンド汚泥、オガ屑等の混合物５ｔを均一になるように
混合したのち、空気比２で、７００℃になるように連続
運転を行っているロータリーキルンに装入した。装入し
た調合物は、ロータリーキルン内に２０分間滞留させ
た。燃えがらは、ロータリーキルン出口部で水中落下さ
せ、冷却した。装入前の汚泥および冷却後の燃えがら、
塊状物からの６価クロムの溶出量を表２に示した。な
お、塊状物は、有姿および粉砕したものの溶出試験をお
こなった。5t of hexavalent chrome soaked into concrete is crushed to a maximum of 500mm, and 5t of a mixture of waste plastic, stand sludge, shavings, etc. is evenly mixed, and the air ratio is set to 700 ° C. It was loaded into a rotary kiln that is continuously operated so that The charged formulation was allowed to dwell in the rotary kiln for 20 minutes. The cinder was dropped in water at the exit of the rotary kiln and cooled. Sludge before charging and cinder after cooling,
Table 2 shows the elution amount of hexavalent chromium from the lumps. The lumps were subjected to a dissolution test of the solid and crushed ones.
【００１７】[0017]
【表２】 [Table 2]
【００１８】表２からもわかるように、汚泥に含まれて
いた６価クロムは、完全に還元されており、無害化でき
た。As can be seen from Table 2, the hexavalent chromium contained in the sludge was completely reduced and could be rendered harmless.
【００１９】[0019]
【実施例３】実施例２と同じ試料を用いて、空気比２
で、温度１，０００℃に維持して還元処理を行った。そ
の結果を、表３に示した。溶出試験の試料は、実施例２
と同じ方法により調整を行った。Example 3 Using the same sample as in Example 2, the air ratio was 2
Then, the reduction treatment was performed while maintaining the temperature at 1,000 ° C. The results are shown in Table 3. The sample of the dissolution test is the sample of Example 2.
The adjustment was made by the same method as described above.
【００２０】[0020]
【表３】 [Table 3]
【００２１】表３からもわかるように、汚泥に含まれて
いた６価クロムは、１，０００℃においても完全に還元
されており、無害化できた。As can be seen from Table 3, the hexavalent chromium contained in the sludge was completely reduced even at 1,000 ° C. and could be rendered harmless.
【００２２】[0022]
【発明の効果】本発明により、６価クロムを含む汚泥あ
るいは塊状物をロータリーキルンを用いて３価クロムに
還元することができる。特に、塊状物は、粉砕などの操
作を行わずに、還元処理ができるので、粉砕等の操作時
の２次公害を未然に防ぐことができる。According to the present invention, sludge or lumps containing hexavalent chromium can be reduced to trivalent chromium by using a rotary kiln. In particular, since the lumps can be subjected to a reduction treatment without performing an operation such as crushing, it is possible to prevent secondary pollution during the operation such as crushing.
Claims (5)
一定の比率で混合した後、ロータリーキルンに装入し、
空気過剰の状態で燃焼している装入物の内部が還元状態
となる条件で焼却することにより６価クロムを３価クロ
ムに還元することを特徴とする６価クロムを含有する汚
泥類の還元処理法。1. A sludge containing hexavalent chromium is mixed with an organic substance at a constant ratio and then charged into a rotary kiln,
Reduction of hexavalent chromium-containing sludge, characterized by reducing hexavalent chromium to trivalent chromium by incineration under the condition that the inside of a charge burning in an excess air state is in a reduced state Processing method.
って、上記汚泥に有機物を含む焼却物を少なくとも重量
比で５０％以上混合し、温度を少なくとも７００℃以上
に維持し、かつ、空気比２以下に維持しているロータリ
ーキルンに装入し、１０分間以上滞留させる熱処理をし
たのち、水により急速に冷却するか、または、還元ガス
雰囲気で冷却するかして、ロータリーキルンから排出す
ることを特徴とする６価クロムを３価クロムに還元する
方法。2. A method for treating sludge containing hexavalent chromium, which comprises mixing at least 50% by weight of an incineration product containing an organic substance with the sludge, and maintaining the temperature at least 700 ° C. or higher, and After charging in a rotary kiln maintaining an air ratio of 2 or less and performing heat treatment for staying for 10 minutes or more, rapidly cool with water or cool in a reducing gas atmosphere and discharge from the rotary kiln. And a method for reducing hexavalent chromium to trivalent chromium.
と有機物を含有する汚泥である請求項２記載の方法。3. The method according to claim 2, wherein the hexavalent chromium-containing sludge is a sludge containing hexavalent chromium and an organic substance.
物の処理法であって、上記塊状物に有機物を含む焼却物
を少なくとも重量比で１００％以上混合し、温度を少な
くとも７００℃以上に維持し、かつ、空気比２以下に維
持しているロータリーキルンに装入し、２０分間以上滞
留させる熱処理をしたのち、水により急速に冷却する
か、または、還元ガス雰囲気で冷却するかしてロータリ
ーキルンから排出することを特徴とする６価クロムを３
価クロムに還元する方法。4. A method for treating a lump containing hexavalent chromium and having a size of 500 mm square or less, wherein an incinerator containing an organic substance is mixed with the lump in an amount of at least 100% by weight, and the temperature is at least 700 ° C. or higher. The rotary kiln is charged into a rotary kiln that is maintained at an air ratio of 2 or less, and heat-treated for 20 minutes or more, and then rapidly cooled with water or cooled in a reducing gas atmosphere. Hexavalent chromium characterized by being discharged from 3
Method of reducing to valent chromium.
ムと有機物を含む５００mm角以下の塊状物である請求項
４記載の方法。5. The method according to claim 4, wherein the hexavalent chromium-containing lump is a lump containing hexavalent chromium and an organic substance and having a size of 500 mm square or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6160705A JPH081194A (en) | 1994-06-20 | 1994-06-20 | Reduction treatment of sludge containing hexavalent chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6160705A JPH081194A (en) | 1994-06-20 | 1994-06-20 | Reduction treatment of sludge containing hexavalent chromium |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2005135938A Division JP2005224802A (en) | 2005-05-09 | 2005-05-09 | Reduction treatment method for sludge, or the like, containing hexavalent chromium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH081194A true JPH081194A (en) | 1996-01-09 |
Family
ID=15720689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6160705A Pending JPH081194A (en) | 1994-06-20 | 1994-06-20 | Reduction treatment of sludge containing hexavalent chromium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH081194A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6223598A (en) * | 1985-07-01 | 1987-01-31 | イ−ストホ−プ インヴエストメンツ リミテイド | Volute pump |
| KR100305235B1 (en) * | 1997-09-26 | 2001-09-24 | 기무라 미찌오 | Method of production of cement |
| JP2002348154A (en) * | 2001-05-29 | 2002-12-04 | Mitsubishi Materials Corp | Treating method of sludge and combustible waste |
| CN105521985A (en) * | 2016-01-19 | 2016-04-27 | 青岛理工大学 | Novel chromium slag pyrolysis treatment method |
| RU2714066C1 (en) * | 2019-06-28 | 2020-02-11 | Алексей Сергеевич Ахлюстин | Method of recycling liquid chromium wastes |
-
1994
- 1994-06-20 JP JP6160705A patent/JPH081194A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6223598A (en) * | 1985-07-01 | 1987-01-31 | イ−ストホ−プ インヴエストメンツ リミテイド | Volute pump |
| JPH081194B2 (en) * | 1985-07-01 | 1996-01-10 | イ−ストホ−プ インヴエストメンツ リミテイド | Volute pump |
| KR100305235B1 (en) * | 1997-09-26 | 2001-09-24 | 기무라 미찌오 | Method of production of cement |
| JP2002348154A (en) * | 2001-05-29 | 2002-12-04 | Mitsubishi Materials Corp | Treating method of sludge and combustible waste |
| CN105521985A (en) * | 2016-01-19 | 2016-04-27 | 青岛理工大学 | Novel chromium slag pyrolysis treatment method |
| RU2714066C1 (en) * | 2019-06-28 | 2020-02-11 | Алексей Сергеевич Ахлюстин | Method of recycling liquid chromium wastes |
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