JP2011131203A - Production and utilization of magnesium hydroxide using steel slag and liquid after completion of desulfurization and absorption liquid of flue gas desulfurization apparatus as raw material - Google Patents

Production and utilization of magnesium hydroxide using steel slag and liquid after completion of desulfurization and absorption liquid of flue gas desulfurization apparatus as raw material Download PDF

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JP2011131203A
JP2011131203A JP2009299584A JP2009299584A JP2011131203A JP 2011131203 A JP2011131203 A JP 2011131203A JP 2009299584 A JP2009299584 A JP 2009299584A JP 2009299584 A JP2009299584 A JP 2009299584A JP 2011131203 A JP2011131203 A JP 2011131203A
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magnesium hydroxide
raw material
flue gas
steel slag
gas desulfurization
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Hisaji Koyama
央二 小山
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Abstract

<P>PROBLEM TO BE SOLVED: To manufacture magnesium hydroxide from a waste such as steel slag and a desulfurization waste liquid. <P>SOLUTION: In a wet type flue gas desulfurization apparatus installed in a thermal power plant using magnesium hydroxide as a raw material, magnesium hydroxide is prepared by making a magnesium sulfate solution discharged to the outside after absorbing a sulfur dioxide gas react with calcium oxide and calcium hydroxide contained in the steel slag, for efficient utilization as a raw material for the flue gas desulfurization apparatus and as a raw material for producing metal magnesium. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、鉄鋼スラグと湿式排煙脱硫装置からの廃棄物から水酸化マグネシウム（Ｍｇ（ＯＨ）２）（水マグ）を精製し有効活用することに関するものである。The present invention relates to purifying magnesium hydroxide (Mg (OH) 2 ) (water mug) from steel slag and waste from wet flue gas desulfurization equipment for effective use.

従来、海水に微量に溶解している塩化マグネシウム（ＭｇＣｌ２）等の水溶液と水酸化ナトリウム（ＮａＯＨ）などの高価な塩基水溶液を反応させることによって作製していた。Conventionally, it has been produced by reacting an aqueous solution of magnesium chloride (MgCl 2 ) or the like dissolved in a trace amount in seawater with an expensive base aqueous solution of sodium hydroxide (NaOH) or the like.

発明が解決しようとする課題Problems to be solved by the invention

そのために、次のような問題点があった。
（イ）上記、水酸化マグネシウム（Ｍｇ（ＯＨ）２）を作製させるための原材料である水酸化ナトリウム（ＮａＯＨ）は、通常、海水の電気分解によって作製されるため、多量の電気を消費し、設備も大掛かりなため生産コストが高く、湿式排煙脱硫装置のアルカリ剤として利用したり、金属マグネシウム（Ｍｇ）を作製するための原材料として利用するには高価なため採算に合わないという問題点があった。
（ロ）そのため、廃棄物として処理している鉄鋼スラグと、湿式排煙脱硫装置から排水として排出される硫酸マグネシウム（ＭｇＳＯ４）を反応させ精製作製することによって、従来の水酸化マグネシウム（Ｍｇ（ＯＨ）２）を生産するコストが非常に高いという問題点を解決するためになされたものである。Therefore, there are the following problems.
(I) Sodium hydroxide (NaOH), which is a raw material for producing magnesium hydroxide (Mg (OH) 2 ), is usually produced by electrolysis of seawater, and thus consumes a large amount of electricity. Because the equipment is large, the production cost is high, and it is expensive to use as an alkaline agent in wet flue gas desulfurization equipment or as a raw material for producing metallic magnesium (Mg), so it is not suitable for profit. there were.
(B) Therefore, conventional magnesium hydroxide (Mg ()) is produced by reacting steel slag treated as waste with magnesium sulfate (MgSO 4 ) discharged as wastewater from the wet flue gas desulfurization device. It was made in order to solve the problem that the cost of producing OH) 2 ) is very high.

課題を解決するための手段Means for solving the problem

水酸化マグネシウム（Ｍｇ（ＯＨ）２）を原材料として使用している湿式排煙脱硫装置から排ガス中の二酸化イオウ（ＳＯ２）を吸収反応した硫酸マグネシウム（ＭｇＳＯ４）溶液と、鉄鋼スラグ中の酸化カルシウム（ＣａＯ）、水酸化カルシウムＣａ（ＯＨ）２とを反応器内で反応させ、水酸化マグネシウム（Ｍｇ（ＯＨ）２）を生成させ、これを分離して利用する。Magnesium sulfate (MgSO 4 ) solution in which sulfur dioxide (SO 2 ) in the exhaust gas is absorbed and reacted from a wet flue gas desulfurization apparatus using magnesium hydroxide (Mg (OH) 2 ) as a raw material, and oxidation in steel slag Calcium (CaO) and calcium hydroxide Ca (OH) 2 are reacted in a reactor to produce magnesium hydroxide (Mg (OH) 2 ), which is separated and used.

発明の効果The invention's effect

（イ）上記のように水酸化マグネシウムを作製する原材料の酸化カルシム、水酸化カルシウム、硫酸マグネシウムは総て廃棄物として処理されているものを再利用し、作製コストを非常に安くするという効果がある。
（ロ）作製された水酸化マグネシウムは、湿式排煙脱硫装置の原材料として利用でき、硫酸マグネシウムを生成するので、これを本件の水酸化マグネシウムを作製する原材料として再利用できる。
（ハ）水酸化マグネシウムを原材料とした湿式排煙脱硫装置は、石灰石石膏法の排煙脱硫装置のように原材料から分解した二酸化炭素ガスを発生する湿式排煙脱硫装置とは異なり、水酸化マグネシウムを二酸化炭素ガスが発生しない二酸化イオウ吸収剤として利用できるという効果がある。(B) As described above, calcium oxide, calcium hydroxide, and magnesium sulfate, which are raw materials for producing magnesium hydroxide, are reused as waste, and the production cost is extremely reduced. is there.
(B) The produced magnesium hydroxide can be used as a raw material for a wet flue gas desulfurization apparatus, and produces magnesium sulfate, which can be reused as a raw material for producing the magnesium hydroxide of the present invention.
(C) Wet flue gas desulfurization equipment using magnesium hydroxide as a raw material is different from wet flue gas desulfurization equipment that generates carbon dioxide gas decomposed from raw materials, such as limestone-gypsum flue gas desulfurization equipment. Can be used as a sulfur dioxide absorbent that does not generate carbon dioxide gas.

以下、本発明の実施の形態について説明する。酸化カルシウム（ＣａＯ）、水酸化カルシウム（Ｃａ（ＯＨ）２）、酸化マグネシウム（ＭｇＯ）、水酸化マグネシウム（Ｍｇ（ＯＨ）２）、酸化シリカ（ＳｉＯ２）、酸化アルミニウム（Ａｌ２Ｏ３）等を含む鉄鋼スラグの塊状物質を粉砕したものと、水酸化マグネシウム（Ｍｇ（ＯＨ）２）を吸収剤とした湿式排煙脱硫装置から生成した硫酸マグネシウム（ＭｇＳＯ４）水溶液を反応器に入れ、攪拌反応させ下記の反応によって、コロイド状の水酸化マグネシウム（Ｍｇ（ＯＨ）２）を生成させ、脱水機、水中での沈降分離等によって、水酸化マグネシウム（Ｍｇ（ＯＨ）２）とその他の固定物と分離して利用する。
（イ）ＣａＯ＋Ｈ２Ｏ→Ｃａ（ＯＨ）２
（ロ）Ｃａ（ＯＨ）２＋ＭｇＳＯ４＋２Ｈ２Ｏ→Ｍｇ（ＯＨ）２＋ＣａＳＯ４・２Ｈ２ＯEmbodiments of the present invention will be described below. Calcium oxide (CaO), calcium hydroxide (Ca (OH) 2 ), magnesium oxide (MgO), magnesium hydroxide (Mg (OH) 2 ), silica oxide (SiO 2 ), aluminum oxide (Al 2 O 3 ), etc. And a magnesium sulfate (MgSO 4 ) aqueous solution produced from a wet flue gas desulfurization apparatus using magnesium hydroxide (Mg (OH) 2 ) as an absorbent are put into a reactor and stirred. The reaction is carried out to produce colloidal magnesium hydroxide (Mg (OH) 2 ) by the following reaction, and magnesium hydroxide (Mg (OH) 2 ) and other fixed substances are obtained by dehydrator, sedimentation separation in water, etc. And use separately.
(A) CaO + H 2 O → Ca (OH) 2
(B) Ca (OH) 2 + MgSO 4 + 2H 2 O → Mg (OH) 2 + CaSO 4 .2H 2 O

Claims (1)

火力発電所等の重油、石炭を燃焼させるボイラーから発生する排ガス中に含まれる二酸化硫黄（ＳＯ２）ガスを吸収除去するために、水酸化マグネシウム（Ｍｇ（ＯＨ）２）を原材料として使用し設置されている湿式排煙脱硫装置において、二酸化イオウ（ＳＯ２）ガスを吸収し系外に排出している硫酸マグネシウム（ＭｇＳＯ４）溶液と、鉄鋼スラグ中に含まれる酸化カルシウム（ＣａＯ）、水酸化カルシウム（Ｃａ（ＯＨ）２）とを反応器で反応させ、水酸化マグネシウム（Ｍｇ（ＯＨ）２）を作製し、これを取り出し活用することを特徴とする水酸化マグネシウム（Ｍｇ（ＯＨ）２）（水マグ）作製法とその装置。Installed using magnesium hydroxide (Mg (OH) 2 ) as a raw material to absorb and remove sulfur dioxide (SO 2 ) gas contained in exhaust gas generated from boilers that burn heavy oil and coal in thermal power plants, etc. In a wet type flue gas desulfurization apparatus, a magnesium sulfate (MgSO 4 ) solution that absorbs sulfur dioxide (SO 2 ) gas and discharges it out of the system, calcium oxide (CaO) contained in steel slag, and hydroxylation calcium (Ca (OH) 2) and allowed to react in the reactor, magnesium hydroxide to produce magnesium hydroxide (Mg (OH) 2), characterized by utilizing removed this (Mg (OH) 2) (Water mug) production method and apparatus.
JP2009299584A 2009-12-24 2009-12-24 Production and utilization of magnesium hydroxide using steel slag and liquid after completion of desulfurization and absorption liquid of flue gas desulfurization apparatus as raw material Pending JP2011131203A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102489134A (en) * 2011-12-07 2012-06-13 闻喜县瑞格镁业有限公司 Desulphurization method adopting calcined dolomite dust
CN105771598A (en) * 2016-04-01 2016-07-20 四川明晶光电科技有限公司 Method for de-dusting and desulfurating smoke through wet process of large touch area tower
CN108939822A (en) * 2018-07-26 2018-12-07 广州华科环保工程有限公司 A kind of method of phosphate fertilizer waste residue desulfurization and resource utilization
CN109092042A (en) * 2018-08-30 2018-12-28 华电电力科学研究院有限公司 It is a kind of that SO in flue gas is removed using steel slag2With SO3System and its working method
CN109173693A (en) * 2018-10-29 2019-01-11 包头钢铁（集团）有限责任公司 A kind of steel slag complex mineral desulfurizing agent and its production method
CN109718658A (en) * 2019-02-28 2019-05-07 陕西煤业化工新型能源有限公司神木分公司 A kind of method of calcium carbide factory's solid waste desulfurization and cycling and reutilization

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102489134A (en) * 2011-12-07 2012-06-13 闻喜县瑞格镁业有限公司 Desulphurization method adopting calcined dolomite dust
CN105771598A (en) * 2016-04-01 2016-07-20 四川明晶光电科技有限公司 Method for de-dusting and desulfurating smoke through wet process of large touch area tower
CN108939822A (en) * 2018-07-26 2018-12-07 广州华科环保工程有限公司 A kind of method of phosphate fertilizer waste residue desulfurization and resource utilization
CN109092042A (en) * 2018-08-30 2018-12-28 华电电力科学研究院有限公司 It is a kind of that SO in flue gas is removed using steel slag2With SO3System and its working method
CN109173693A (en) * 2018-10-29 2019-01-11 包头钢铁（集团）有限责任公司 A kind of steel slag complex mineral desulfurizing agent and its production method
CN109718658A (en) * 2019-02-28 2019-05-07 陕西煤业化工新型能源有限公司神木分公司 A kind of method of calcium carbide factory's solid waste desulfurization and cycling and reutilization

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