JPH0318960B2 - - Google Patents
Info
- Publication number
- JPH0318960B2 JPH0318960B2 JP62263326A JP26332687A JPH0318960B2 JP H0318960 B2 JPH0318960 B2 JP H0318960B2 JP 62263326 A JP62263326 A JP 62263326A JP 26332687 A JP26332687 A JP 26332687A JP H0318960 B2 JPH0318960 B2 JP H0318960B2
- Authority
- JP
- Japan
- Prior art keywords
- hydroxide
- water
- filtration
- dehydration
- group
- 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.)
- Expired - Lifetime
Links
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 150000002431 hydrogen Chemical class 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 125000003277 amino group Chemical group 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- 229910000000 metal hydroxide Inorganic materials 0.000 description 26
- 150000004692 metal hydroxides Chemical class 0.000 description 26
- 238000001914 filtration Methods 0.000 description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 24
- 230000018044 dehydration Effects 0.000 description 23
- 238000006297 dehydration reaction Methods 0.000 description 23
- 238000000034 method Methods 0.000 description 12
- 239000002002 slurry Substances 0.000 description 11
- 239000002245 particle Substances 0.000 description 8
- 235000012970 cakes Nutrition 0.000 description 7
- 238000005406 washing Methods 0.000 description 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 125000000129 anionic group Chemical group 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 229920003169 water-soluble polymer Polymers 0.000 description 3
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- FXNDIJDIPNCZQJ-UHFFFAOYSA-N 2,4,4-trimethylpent-1-ene Chemical group CC(=C)CC(C)(C)C FXNDIJDIPNCZQJ-UHFFFAOYSA-N 0.000 description 1
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- ASKVAEGIVYSGNY-UHFFFAOYSA-L cobalt(ii) hydroxide Chemical compound [OH-].[OH-].[Co+2] ASKVAEGIVYSGNY-UHFFFAOYSA-L 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000021463 dry cake Nutrition 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- GGQZVHANTCDJCX-UHFFFAOYSA-N germanium;tetrahydrate Chemical compound O.O.O.O.[Ge] GGQZVHANTCDJCX-UHFFFAOYSA-N 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 229910021514 lead(II) hydroxide Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- UUCCCPNEFXQJEL-UHFFFAOYSA-L strontium dihydroxide Chemical compound [OH-].[OH-].[Sr+2] UUCCCPNEFXQJEL-UHFFFAOYSA-L 0.000 description 1
- 229910001866 strontium hydroxide Inorganic materials 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- CVNKFOIOZXAFBO-UHFFFAOYSA-J tin(4+);tetrahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[Sn+4] CVNKFOIOZXAFBO-UHFFFAOYSA-J 0.000 description 1
- LLZRNZOLAXHGLL-UHFFFAOYSA-J titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は水不溶性金属水酸化物（以下水難溶性
金属水酸化物も含む）の水スラリーの濾過脱水性
向上剤に関し、詳しくは水不溶性金属水酸化物粒
子の水スラリーから効率よくかつ経済的に水分を
除去するために使用される或種のアニオン性水溶
性高分子からなる濾過脱水性向上剤に関するもの
である。
〔従来の技術及び問題点〕
一般に浸潤した水不溶性金属水酸化物粒子はそ
の金属の種類、生成条件、粒子の大きさ、形状、
表面状態及び濾過条件等により異なるが、濾過脱
水された後も相当多量の水分を含有している。特
に金属塩溶液をアルカリ性にして沈澱させて得た
金属水酸化物では組成式の一定しない多量の水を
含んだ水酸化物が得られることが多い。このよう
なものの脱水には真空（減圧）濾過脱水法がしば
しば採用されているが、それでもかなりの水分が
残る。例えば水酸化アルミニウム水スラリーを真
空濾過脱水法により脱水した場合には、一般に８
〜16重量％程度の水分を含む水酸化アルミニウム
ケークが得られる。濾過脱水された後の湿潤金属
水酸化物はそのまま水酸化物として製品化される
ほか、さらに焼成されて金属酸化物として製品化
される場合が多い。ところがこの湿潤金属水酸化
物中に含まれる水分は、水酸化物としての製品の
場合には貯蔵中の水分の均一化等による一部製品
の商品価値の低下あるいは輸送コストの増加等の
不利益を生じ、また焼成による金属酸化物として
の製品の場合には、湿潤金属水酸化物中の含有水
分の蒸発熱のために焼成工程に必要な燃料費の増
太という不利益等が生じる。ことに昨今の燃料価
格の高騰により著しくその製造コストが上昇して
いるため、エネルギーコストの低減化は重要な課
題となつている。
従つて金属水酸化物の水スラリーの濾過脱水工
程において効率良くかつ経済的に金属水酸化物中
の水分含有量を現状以下に低下せしめる方策が必
要とされ、例えば濾過装置やフイルターの種類等
の物理的条件を改良すること等が試みられている
が、何らかの添加剤を加えることによつてさらに
脱水効率を高めることが望ましいことは言うまで
もない。
〔問題点を解決するための手段〕
本発明者等はかかる現状において鋭意研究を重
ねた結果、水不溶性又は水難溶性金属水酸化物の
水スラリーを濾過脱水するに際して、一般式(1)及
び(2)で表される繰り返し単位より成るアニオン性
水溶性高分子を添加使用すれば、極めて効率良く
かつ経済的にその水分含有量を低減することがで
きることを見出し本発明を完成するに至つた。
一般式(1)
（式中、Ｘ及びＹはそれぞれ水素、一価金属、二
価金属、アンモニウム基、有機アミン基を表す）
一般式(2)
（式中、R1は水素又はメチル基を表し、R2は水
素、炭素数１〜８のアルキル基、又はフエニル基
を表す）
更に詳しく本発明について説明すると、一般式
(1)で表される繰り返し単位と、一般式(2)で表され
る繰り返し単位とから成り、(1)の全量と(2)の全量
のモル比が、(1)／(2)＝100／50〜50／100の範囲で
あり、数平均分子量が1000ないし500000であるア
ニオン性水溶性高分子からなる水不溶性又は水難
溶性金属水酸化物水スラリーのろ過脱水性向上剤
に関するものである。
（尚、この平均分子量はGPC法により測定し
たものである）。
このような高分子化合物としては、マレイン酸
とエチレン、イソブテン、ペンテン、ヘキセン、
ジイソブチレン、スチレン等の共重合体及びその
塩を挙げることが出来る。
本発明の化合物の製造法は特に限定されるもの
でなく、従来公知の種々の方法によつて製造され
たものでよい。
本発明の濾過脱水性向上剤が使用される水不溶
性又水難溶性金属水酸化物の例としては、水酸化
マグネシウム、水酸化カルシウム、水酸化ストロ
ンチウム、水酸化バリウム等の−Ａ族金属水酸
化物類；水酸化アルミニウム、水酸化カリウム、
水酸化イソジウム等の−Ａ族金属水酸化物類；
水酸化ゲルマニウム、水酸化スズ、水酸化鉛等の
−Ａ族金属水酸化物類；水酸化鉄、水酸化コバ
ルト、水酸化ニツケル等の族金属水酸化物類；
水酸化亜鉛等の−Ｂ族金属水酸化物類；水酸化
チタン等の−Ｂ族金属水酸化物類等が挙げられ
る。これらの金属水酸化物はその粒子直径が0.1
〜1000μｍ程度の粒子、もしくはそれが凝結した
多孔質状の粒子であつても良い。
本発明の濾過脱水性向上剤は、金属水酸化物の
水スラリーの濾過脱水工程において、最終的に濾
過脱水する工程の以前の水スラリー中に所定濃度
添加するか、洗浄水中に添加して使用され得る。
例えば、金属水酸化物の製造工程液によりスラリ
ー化されたものをそのまま濾過脱水ケークを製造
する場合には、その工程液中に濾過脱水性向上剤
を添加しておけばよく、あるいは一旦工程液を脱
水した湿潤ケークを蒸溜水等で洗浄した後、再び
濾過脱水を行う場合には、その洗浄水中に濾過脱
水性向上剤を添加することができる。一般的に金
属水酸化物製造工程液は高いイオン強度を持ち、
アルカリ水溶液であつたり塩濃度が高かつたりす
る場合が多いため、精製水等を用いる洗浄水中に
濾過脱水性向上剤を添加するのが有利である。
本発明の濾過脱水性向上剤の金属水酸化物水ス
ラリーに対する添加量は、金属水酸化物の種類、
粒度分布、粒子表面の状態あるいは濾過脱水条件
等に応じて変わり得るが、乾燥金属水酸化物の単
位重量当たり、約100ppm〜20000ppm程度で含水
量低減率は最高約60％にも達する（実施例参照）。
金属水酸化物水スラリーの濾過脱水にあたつて
は、濾過側から吸引して減圧（真空）として脱水
を促進する方式や、逆に上から加圧して脱水を促
進する方式等があるが、本発明の濾過脱水性向上
剤はいずれの方式においても使用され得る。
また、本発明の化合物と、各種のアニオン性、
非イオン性の海面活性剤及びポリアクリルアマイ
ド又はその加水分解等の高分子凝集剤を併用して
も良い。
〔実施例〕
次に例を挙げて説明するが、本発明はこれらの
例に限定されるものではない。
実施例 １
水酸化ナトリウムの１モル水溶液100mlと水酸
化アルミニウム粉体60ｇとを混合し、60秒間所定
回転数で撹拌した後、直径７cmの瀘紙（東洋瀘紙
製No.２）を置いたブフナーロート上に注ぐ。30秒
間静置した後、減圧度500mmHgで１分間吸引濾過
及び通気を行う。続いて濾過後のケークに対して
所定量の濾過脱水性向上剤を含む洗浄水（蒸溜
水）100mlをさらに注いで減圧度500mmmHgにて
３分間吸引濾過及び通気を行う。以上の濾過脱水
操作により得られた湿潤水酸化アルミニウムケー
ク50ｇを坪量し、110℃にて乾燥してその恒量
（乾燥ケーク重量）を測定する。濾過脱水後の水
酸化アルミニウムの含水率を次式により算出す
る。
含水率（wt％）
＝（１−乾燥ケーク重量／湿潤ケーク重量）×10
0
表１には、90℃の洗浄水中に各種の脱水性向上
剤を水酸化アルミニウム粉体に対して2000ppm
（重量基準）添加し、同時に脱水性向上剤を添加
しないブランク試験を行つた結果を示した。
【表】Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a filtration and dehydration improver for water slurry of water-insoluble metal hydroxides (hereinafter also referred to as poorly water-soluble metal hydroxides), and more specifically, The present invention relates to a filtration and dehydration improver comprising a certain type of anionic water-soluble polymer used to efficiently and economically remove water from an aqueous slurry of hydroxide particles. [Prior art and problems] In general, infiltrated water-insoluble metal hydroxide particles are affected by the type of metal, production conditions, particle size, shape,
Although it varies depending on the surface condition and filtration conditions, it still contains a considerable amount of water even after being filtered and dehydrated. In particular, in the case of metal hydroxides obtained by making a metal salt solution alkaline and precipitating it, a hydroxide containing a large amount of water with an inconsistent compositional formula is often obtained. Although vacuum (reduced pressure) filtration and dehydration methods are often used to dehydrate such materials, a considerable amount of water still remains. For example, when aluminum hydroxide water slurry is dehydrated by vacuum filtration and dehydration, generally 8
An aluminum hydroxide cake containing about 16% by weight of water is obtained. The wet metal hydroxide after being filtered and dehydrated is not only manufactured into a product as a hydroxide as it is, but also often further calcined to be manufactured into a product as a metal oxide. However, the moisture contained in this wet metal hydroxide may cause disadvantages such as a decrease in the commercial value of some products or an increase in transportation costs due to the homogenization of moisture during storage in the case of hydroxide products. In addition, in the case of a product produced as a metal oxide by firing, there are disadvantages such as an increase in fuel costs required for the firing process due to the heat of evaporation of the water contained in the wet metal hydroxide. In particular, the recent rise in fuel prices has significantly increased their manufacturing costs, so reducing energy costs has become an important issue. Therefore, there is a need for measures to efficiently and economically reduce the water content in metal hydroxides to below the current level in the filtration and dehydration process of water slurry of metal hydroxides. Attempts have been made to improve the physical conditions, but it goes without saying that it is desirable to further increase the dewatering efficiency by adding some kind of additive. [Means for Solving the Problems] As a result of intensive research under the current circumstances, the present inventors found that when filtering and dehydrating an aqueous slurry of water-insoluble or poorly water-soluble metal hydroxides, the general formulas (1) and ( We have completed the present invention by discovering that by adding an anionic water-soluble polymer consisting of the repeating unit represented by 2), the water content can be reduced extremely efficiently and economically. General formula (1) (In the formula, X and Y represent hydrogen, monovalent metal, divalent metal, ammonium group, and organic amine group, respectively) General formula (2) (In the formula, R 1 represents hydrogen or a methyl group, and R 2 represents hydrogen, an alkyl group having 1 to 8 carbon atoms, or a phenyl group.) To explain the present invention in more detail, the general formula
It consists of a repeating unit represented by (1) and a repeating unit represented by general formula (2), and the molar ratio of the total amount of (1) and the total amount of (2) is (1)/(2)= This invention relates to a filtration and dehydration improver for water-insoluble or poorly water-soluble metal hydroxide aqueous slurry, which is comprised of an anionic water-soluble polymer having a number average molecular weight of 100/50 to 50/100 and a number average molecular weight of 1000 to 500000. . (This average molecular weight was measured by GPC method). Such polymeric compounds include maleic acid, ethylene, isobutene, pentene, hexene,
Copolymers of diisobutylene, styrene, etc. and salts thereof can be mentioned. The method for producing the compound of the present invention is not particularly limited, and compounds may be produced by various conventionally known methods. Examples of water-insoluble or slightly water-soluble metal hydroxides for which the filtration and dehydration improver of the present invention are used include -A group metal hydroxides such as magnesium hydroxide, calcium hydroxide, strontium hydroxide, and barium hydroxide. Class; aluminum hydroxide, potassium hydroxide,
-A group metal hydroxides such as isodium hydroxide;
-A group metal hydroxides such as germanium hydroxide, tin hydroxide, and lead hydroxide; Group metal hydroxides such as iron hydroxide, cobalt hydroxide, and nickel hydroxide;
Examples include -B group metal hydroxides such as zinc hydroxide; -B group metal hydroxides such as titanium hydroxide. These metal hydroxides have a particle diameter of 0.1
It may be particles of about 1,000 μm or porous particles formed by condensation. The filtration and dehydration performance improver of the present invention is used in the filtration and dehydration process of metal hydroxide water slurry by adding it to a predetermined concentration into the water slurry before the final filtration and dehydration process, or by adding it to the washing water. can be done.
For example, when producing a filtration and dehydration cake from a slurry made from a metal hydroxide manufacturing process liquid, it is sufficient to add a filtration and dehydration property improver to the process liquid, or to temporarily process the process liquid. When the wet cake obtained by dehydrating is washed with distilled water or the like and then subjected to filtration and dehydration again, a filtration and dehydration property improver can be added to the washing water. Generally, metal hydroxide manufacturing process liquids have high ionic strength,
Since the washing water is often an alkaline aqueous solution or has a high salt concentration, it is advantageous to add a filtration and dewatering property improver to the washing water using purified water or the like. The amount of the filtration and dehydration improver of the present invention added to the metal hydroxide aqueous slurry depends on the type of metal hydroxide,
Although it may vary depending on the particle size distribution, particle surface condition, filtration and dehydration conditions, etc., the water content reduction rate reaches a maximum of about 60% at about 100 ppm to 20,000 ppm per unit weight of dry metal hydroxide (Example reference). When filtering and dehydrating metal hydroxide aqueous slurry, there are two methods: one is to draw suction from the filtration side and create a reduced pressure (vacuum) to promote dehydration, and the other is to apply pressure from above to accelerate dehydration. The filtration and dewatering performance improver of the present invention can be used in any method. In addition, the compound of the present invention and various anionic,
A nonionic sea surfactant and a polymer flocculant such as polyacrylamide or its hydrolysis may be used in combination. [Example] Next, the present invention will be explained by giving examples, but the present invention is not limited to these examples. Example 1 100 ml of a 1 molar aqueous solution of sodium hydroxide and 60 g of aluminum hydroxide powder were mixed, stirred at a specified rotation speed for 60 seconds, and then a filter paper (No. 2 manufactured by Toyo Roshi Co., Ltd.) with a diameter of 7 cm was placed. Pour onto Buchner funnel. After allowing it to stand still for 30 seconds, suction filtration and ventilation are performed for 1 minute at a reduced pressure of 500 mmHg. Subsequently, 100 ml of washing water (distilled water) containing a predetermined amount of filtration and dehydration improver was poured into the cake after filtration, and suction filtration and aeration were performed at a reduced pressure of 500 mmHg for 3 minutes. 50 g of the wet aluminum hydroxide cake obtained by the above filtration and dehydration operation is weighed, dried at 110° C., and its constant weight (dry cake weight) is measured. The water content of aluminum hydroxide after filtration and dehydration is calculated using the following formula. Moisture content (wt%) = (1-dry cake weight/wet cake weight) x 10
0 Table 1 shows that 2000 ppm of various dehydration improvers were added to aluminum hydroxide powder in 90°C washing water.
(on a weight basis) and a blank test in which no dehydration improver was added at the same time. 【table】
Claims (1)
価金属、アンモニウム基、有機アミン基を表す）
で表される繰り返し単位と、 一般式(2) （式中、R1は水素又はメチル基を表し、R2は水
素、炭素数１〜８のアルキル基、又はフエニル基
を表す）で表される繰り返し単位とから成り、(1)
の全量と(2)の全量のモル比が、(1)／(2)＝100／50
〜50／100の範囲であり、数平均分子量が1000な
いし500000であるアニオン性水溶性高分子からな
る水不溶性又は水難溶性金属水酸化物水スラリー
のろ過脱水性向上剤。[Claims] 1 General formula (1) (In the formula, X and Y represent hydrogen, monovalent metal, divalent metal, ammonium group, and organic amine group, respectively)
The repeating unit represented by and the general formula (2) (In the formula, R 1 represents hydrogen or a methyl group, and R 2 represents hydrogen, an alkyl group having 1 to 8 carbon atoms, or a phenyl group.)
The molar ratio of the total amount of and the total amount of (2) is (1)/(2)=100/50
50/100 and a number average molecular weight of 1,000 to 500,000.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62263326A JPH01107900A (en) | 1987-10-19 | 1987-10-19 | Filtaration-dehydration improver for aqueous metal hydroxide slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62263326A JPH01107900A (en) | 1987-10-19 | 1987-10-19 | Filtaration-dehydration improver for aqueous metal hydroxide slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01107900A JPH01107900A (en) | 1989-04-25 |
| JPH0318960B2 true JPH0318960B2 (en) | 1991-03-13 |
Family
ID=17387921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62263326A Granted JPH01107900A (en) | 1987-10-19 | 1987-10-19 | Filtaration-dehydration improver for aqueous metal hydroxide slurry |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01107900A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4619978B2 (en) * | 2006-04-06 | 2011-01-26 | ダイヤニトリックス株式会社 | Nickel-containing wastewater treatment method |
| AU2017425846B2 (en) | 2017-08-02 | 2021-01-21 | Mitsubishi Electric Corporation | Air conditioner |
| JP7731768B2 (en) * | 2021-11-16 | 2025-09-01 | 花王株式会社 | Dewatering promoter composition for wet sludge |
-
1987
- 1987-10-19 JP JP62263326A patent/JPH01107900A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01107900A (en) | 1989-04-25 |
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