JPH01126217A - Production of easy-fluidity magnesium hydroxide slurry - Google Patents
Production of easy-fluidity magnesium hydroxide slurryInfo
- Publication number
- JPH01126217A JPH01126217A JP28424287A JP28424287A JPH01126217A JP H01126217 A JPH01126217 A JP H01126217A JP 28424287 A JP28424287 A JP 28424287A JP 28424287 A JP28424287 A JP 28424287A JP H01126217 A JPH01126217 A JP H01126217A
- Authority
- JP
- Japan
- Prior art keywords
- magnesium hydroxide
- water
- soluble silicate
- easy
- production
- 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
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 title claims abstract description 14
- 239000000347 magnesium hydroxide Substances 0.000 title claims abstract description 14
- 229910001862 magnesium hydroxide Inorganic materials 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 239000002002 slurry Substances 0.000 title abstract description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 1
- 238000001556 precipitation Methods 0.000 abstract description 4
- 239000010802 sludge Substances 0.000 abstract description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 3
- 235000019353 potassium silicate Nutrition 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000016615 flocculation Effects 0.000 abstract 1
- 238000005189 flocculation Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 230000003472 neutralizing effect Effects 0.000 abstract 1
- 235000012254 magnesium hydroxide Nutrition 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- ZADYMNAVLSWLEQ-UHFFFAOYSA-N magnesium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[Mg+2].[Si+4] ZADYMNAVLSWLEQ-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は上下水道、廃酸中和、排煙脱硫などに使用され
る水酸化マグネシウムスラリーの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing magnesium hydroxide slurry for use in water supply and sewage systems, waste acid neutralization, flue gas desulfurization, and the like.
我国におけるマグネシウム資源は主に海水から得られて
いるが、近年海外から天然資源であるマグネサイトある
いはその焼成物であるマグネシアが入手できるようにな
った。海水から得られる水酸化マグネシウムは沈澱生成
によるもので、もともと細かく沈澱物のケーキング（固
結化）が起こりにくいが、マグネシアの消化から得る水
酸化マグネシウムはマグネシア粒子が吸水して出来るた
め、微粉の原料を用いても沈降しないと言う細かさでは
なく、放置すると直ぐにケーキングして簡単には水中分
散しなくなる。特に塩分がわずかでもある場合には凝集
沈澱を伴うために特にケーキングによる固結がひどくな
る。特公昭６１−５６１６８及び特公昭６１−５６１６
９ではスラリーの分散性を良くするためにカルボン酸系
などの高分子分散剤を添加する方法があるが、スラッジ
の発生を伴うような中和゛処理に際してはスラッジが沈
澱しなくなるため、摘要できなかった。Magnesium resources in Japan are mainly obtained from seawater, but in recent years the natural resource magnesite or its calcined product magnesia has become available from overseas. Magnesium hydroxide obtained from seawater is produced by precipitation, and is inherently fine and difficult to cause caking (caking) of the precipitate, but magnesium hydroxide obtained from the digestion of magnesia is formed by magnesia particles absorbing water, so it is fine powder. It is not so fine that it will not settle even if the raw materials are used, and if left undisturbed, it will quickly caking and will not be easily dispersed in water. In particular, when there is even a small amount of salt, caking becomes particularly severe due to coagulation and precipitation. Special Publication No. 61-56168 and Special Publication No. 61-5616
9, there is a method of adding a polymeric dispersant such as a carboxylic acid type to improve the dispersibility of the slurry, but it cannot be summarized because the sludge will not settle during neutralization treatment that involves the generation of sludge. There wasn't.
本発明は水酸化マグネシウムのケーキングを防止し、か
つ廃酸等を中和した際発生するスラッジの凝集沈澱を妨
げないようにする。The present invention prevents caking of magnesium hydroxide and does not prevent coagulation and precipitation of sludge generated when waste acids and the like are neutralized.
軽焼の粉末マグネシアを水中に懸濁させ、加熱して消化
を速める。この時の反応はＭｇＯ＋Ｈ，Ｏ−＋Ｍｇ （
ＯＨ）２
のように進み、Ｍｇ０粒子は水を吸収してＭｇ（ＯＨ）
２ に成りつつ粒子が増大し、沈澱しやすいスラリーと
なる。全体がほぼＭｇ（ＯＨ）２ に消化したところで
、水溶性ケイ酸塩を加え、沈澱物の固結を防ぐ、水溶性
ケイ酸塩としては水ガラスのようなケイ酸ソーダが良く
、添加量は１１００ｐｐ以上で多い程その効果は大であ
り、適性値としてはおよそ１１０００ｐｐである。又、
１１００ｐｐ以下でも添加されていればケーキは柔らか
く撹拌により簡単に分散出来る。Lightly calcined powdered magnesia is suspended in water and heated to speed up digestion. The reaction at this time is MgO+H, O-+Mg (
OH)2, Mg0 particles absorb water and become Mg(OH)
2, the particles increase and become a slurry that tends to settle. When the entire substance has been almost completely digested to Mg(OH)2, water-soluble silicate is added to prevent the solidification of the precipitate. A good water-soluble silicate is sodium silicate, such as water glass, and the amount added is The more the amount is 1,100 pp or more, the greater the effect, and the appropriate value is approximately 11,000 pp. or,
If less than 1100 pp is added, the cake will be soft and easily dispersed by stirring.
水溶性のケイ酸塩が、水酸化マグネシウムスラリー中に
添加されると、水酸化マグネシウム粒子表面にケイ酸マ
グネシウムのゲルが生成し、粒子が被膜されて粒子同志
の固結を防止する。When a water-soluble silicate is added to the magnesium hydroxide slurry, a gel of magnesium silicate is formed on the surface of the magnesium hydroxide particles, coating the particles and preventing the particles from caking together.
〔実施例〕
軽焼のマグネシア１ｋｇを８０℃の温水３Ω中に投入し
、２０時間撹拌消化させたのち、３分水ガラスｌｅｅを
添加混合した。撹拌を止めて２４時間静置後、この容器
を傾けてスラリーを排出したところ、底部に沈澱してい
た沈澱物も簡単に流出した。[Example] 1 kg of lightly calcined magnesia was put into 3Ω of 80°C warm water, stirred and digested for 20 hours, and then 3-minute water glass lee was added and mixed. After the stirring was stopped and the container was allowed to stand for 24 hours, the slurry was discharged by tilting the container, and the precipitate that had settled at the bottom also flowed out easily.
従来、ケイ酸塩を添加しなかったものでは底部の沈澱物
は強固に固結し、排出されずタンクの有効容積を小さく
するばかりでなく使用する容器の掃除も頻繁であった０
本発明ではケイ酸塩の添加量に応じ、数日から数週間沈
澱物の固結を防ぎ、輸送タンクあるいは貯蔵タンクから
のスラリー排出を容易にした。Conventionally, with products that did not contain silicate, the sediment at the bottom solidified and was not discharged, which not only reduced the effective volume of the tank but also required frequent cleaning of the container used.
In the present invention, depending on the amount of silicate added, solidification of the precipitate is prevented for several days to several weeks, and slurry discharge from a transport tank or a storage tank is facilitated.
特許出願人 川鉄鉱業株式会社Patent applicant: Kawatetsu Mining Co., Ltd.
Claims (1)
て水酸化マグネシウムを生成させ、これに水酸化マグネ
シウム比で１００ｐｐｍ以上の水溶性ケイ酸塩を添加混
合することを特徴とする易流動性水酸化マグネシウムの
製造方法。Free-flowing water characterized by adding powdered magnesia to warm water, digesting it while stirring to produce magnesium hydroxide, and adding and mixing water-soluble silicate with a magnesium hydroxide ratio of 100 ppm or more. Method for producing magnesium oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28424287A JPH07486B2 (en) | 1987-11-12 | 1987-11-12 | Method for producing free-flowing magnesium hydroxide slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28424287A JPH07486B2 (en) | 1987-11-12 | 1987-11-12 | Method for producing free-flowing magnesium hydroxide slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01126217A true JPH01126217A (en) | 1989-05-18 |
| JPH07486B2 JPH07486B2 (en) | 1995-01-11 |
Family
ID=17676004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28424287A Expired - Lifetime JPH07486B2 (en) | 1987-11-12 | 1987-11-12 | Method for producing free-flowing magnesium hydroxide slurry |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07486B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100404457B1 (en) * | 2000-01-10 | 2003-11-05 | 고려특수화학주식회사 | Method for manufacturing a magnesium hydroxide suspension for using as a counteragent |
| DE4400954B4 (en) * | 1994-01-14 | 2007-03-01 | Stefan Kürzeder | Process for increasing the brightness of bleaching wood pulp with hydrogen peroxide |
-
1987
- 1987-11-12 JP JP28424287A patent/JPH07486B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4400954B4 (en) * | 1994-01-14 | 2007-03-01 | Stefan Kürzeder | Process for increasing the brightness of bleaching wood pulp with hydrogen peroxide |
| KR100404457B1 (en) * | 2000-01-10 | 2003-11-05 | 고려특수화학주식회사 | Method for manufacturing a magnesium hydroxide suspension for using as a counteragent |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07486B2 (en) | 1995-01-11 |
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