Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
IRON AND STEEL SLAG TREATMENT METHOD
PROBLEM TO BE SOLVED: To recover Ca content from iron and steel slag and to recover at low cost, NaOH and HCl which are used for treatment.SOLUTION: An iron and steel slag treatment method is provided which performs: a step 1 of separating CaCl-containing solution and an undissolved matter containing Fe content by filtration, the CaCl-containing solution being produced by processing iron and steel slag in a dissolving tank using hydrochloric acid solution containing NaCl at pH=0 to 1; a step 2 of separating a Fe(OH)-containing precipitate by filtration, the Fe(OH)-containing precipitate being produced by adding alkali to the CaCl-containing solution from which the undissolved matter has been separated by filtration and processing the CaCl-containing solution at pH=3 to less than 10.5; a step 3 of separating a Ca(OH)-containing precipitate and NaCl-containing solution by filtration, the Ca(OH)-containing precipitate being produced by adding alkali to the CaCl-containing solution from which the Fe(OH)-containing precipitate has been separated by filtration and processing the CaCl-containing solution at pH=10.5 to 13; a step 4 of converting the NaCl-containing solution obtained in the step 3 into hydrogen, chlorine and NaOH solution by electrolysis; and a step 5 of synthesizing HCl from the hydrogen and the chlorine obtained in the step 4.SELECTED DRAWING: Figure 1
【課題】鉄鋼スラグからＣａ分を回収し、処理に用いるＮａＯＨとＨＣｌを低コストで回収する。【解決手段】鉄鋼スラグを溶解槽においてpＨ＝０〜１のＮａＣｌを含む塩酸溶液で処理することでできるＣａＣｌ２を含む溶液とＦｅ分を含む未溶解物を、濾別で分離する工程１と、前記未溶解物が濾別された前記ＣａＣｌ２を含む溶液にアルカリを添加し、pＨ＝３〜１０．５未満で処理することでできるＦｅ（ＯＨ）３を含む沈殿物を、濾別で分離する工程２と、前記沈殿物が濾別された前記ＣａＣｌ２を含む溶液にアルカリを添加し、pＨ＝１０．５〜１３で処理することでできるＣａ（ＯＨ）２を含む沈殿物とＮａＣｌを含む溶液を濾別で分離する工程３と、前記工程３でできるＮａＣｌを含む溶液を電気分解により水素と塩素とＮａＯＨ溶液にする工程４と、前記工程４でできる水素と塩素からＨＣｌを合成する工程５と、を実施することを特徴とする鉄鋼スラグの処理方法。【選択図】図１
IRON AND STEEL SLAG TREATMENT METHOD
PROBLEM TO BE SOLVED: To recover Ca content from iron and steel slag and to recover at low cost, NaOH and HCl which are used for treatment.SOLUTION: An iron and steel slag treatment method is provided which performs: a step 1 of separating CaCl-containing solution and an undissolved matter containing Fe content by filtration, the CaCl-containing solution being produced by processing iron and steel slag in a dissolving tank using hydrochloric acid solution containing NaCl at pH=0 to 1; a step 2 of separating a Fe(OH)-containing precipitate by filtration, the Fe(OH)-containing precipitate being produced by adding alkali to the CaCl-containing solution from which the undissolved matter has been separated by filtration and processing the CaCl-containing solution at pH=3 to less than 10.5; a step 3 of separating a Ca(OH)-containing precipitate and NaCl-containing solution by filtration, the Ca(OH)-containing precipitate being produced by adding alkali to the CaCl-containing solution from which the Fe(OH)-containing precipitate has been separated by filtration and processing the CaCl-containing solution at pH=10.5 to 13; a step 4 of converting the NaCl-containing solution obtained in the step 3 into hydrogen, chlorine and NaOH solution by electrolysis; and a step 5 of synthesizing HCl from the hydrogen and the chlorine obtained in the step 4.SELECTED DRAWING: Figure 1
【課題】鉄鋼スラグからＣａ分を回収し、処理に用いるＮａＯＨとＨＣｌを低コストで回収する。【解決手段】鉄鋼スラグを溶解槽においてpＨ＝０〜１のＮａＣｌを含む塩酸溶液で処理することでできるＣａＣｌ２を含む溶液とＦｅ分を含む未溶解物を、濾別で分離する工程１と、前記未溶解物が濾別された前記ＣａＣｌ２を含む溶液にアルカリを添加し、pＨ＝３〜１０．５未満で処理することでできるＦｅ（ＯＨ）３を含む沈殿物を、濾別で分離する工程２と、前記沈殿物が濾別された前記ＣａＣｌ２を含む溶液にアルカリを添加し、pＨ＝１０．５〜１３で処理することでできるＣａ（ＯＨ）２を含む沈殿物とＮａＣｌを含む溶液を濾別で分離する工程３と、前記工程３でできるＮａＣｌを含む溶液を電気分解により水素と塩素とＮａＯＨ溶液にする工程４と、前記工程４でできる水素と塩素からＨＣｌを合成する工程５と、を実施することを特徴とする鉄鋼スラグの処理方法。【選択図】図１
IRON AND STEEL SLAG TREATMENT METHOD
鉄鋼スラグの処理方法
MATSUBAYASHI SHIGEHARU (Autor:in) / SEKIYA MASAHIRO (Autor:in) / KATO MASAAKI (Autor:in) / OTSU HIDEO (Autor:in)
04.02.2016
Patent
Elektronische Ressource
Japanisch
IPC:
B01D
SEPARATION
,
Trennen
/
C04B
Kalk
,
LIME
/
B09B
DISPOSAL OF SOLID WASTE
,
Beseitigung von festem Abfall
/
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
/
C02F
Behandlung von Wasser, Schmutzwasser, Abwasser oder von Abwasserschlamm
,
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
/
C25B
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON- METALS
,
Elektrolytische oder elektrophoretische Verfahren für die Herstellung von Verbindungen oder von nichtmetallischen Elementen
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