JPH1110631A - Manufacture of inorganic plate - Google Patents
Manufacture of inorganic plateInfo
- Publication number
- JPH1110631A JPH1110631A JP16832097A JP16832097A JPH1110631A JP H1110631 A JPH1110631 A JP H1110631A JP 16832097 A JP16832097 A JP 16832097A JP 16832097 A JP16832097 A JP 16832097A JP H1110631 A JPH1110631 A JP H1110631A
- Authority
- JP
- Japan
- Prior art keywords
- cod
- cement
- cement material
- water
- pulp
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/006—Aspects relating to the mixing step of the mortar preparation involving the elimination of excess water from the mixture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、壁材等の建材とし
て用いられる無機質板の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an inorganic plate used as a building material such as a wall material.
【０００２】[0002]
【従来の技術】従来より、セメントとパルプを含む固形
分を混合水と混ぜて分散させてスラリー状のセメント材
料を調製し、このセメント材料を一方向に進行する無端
ループ状の脱水フェルトの上に供給すると共に脱水フェ
ルトを介して脱水フェルト上のセメント材料を吸引脱水
し、脱水されたセメント材料を養生硬化して無機質板を
製造することが行われている。このようして無機質板を
製造するにあたって、脱水フェルト上のセメント材料を
脱水することによって生じた白水は、排水として廃棄さ
れずに次の他のセメント材料を調製する工程に戻され、
次のセメント材料を調製する混合水の一部として再利用
することが行われている。つまり、セメントとパルプを
含む固形分と白水でない新たな水及び白水を混ぜて分散
させて新たなセメント材料を調製するようにしており、
このことで白水に含まれているセメントなどの固形分が
無駄に廃棄されないようにすることができるのである。2. Description of the Related Art Conventionally, a solid content containing cement and pulp is mixed with mixed water and dispersed to prepare a cement material in the form of a slurry, and this cement material is placed on an endless loop-shaped dehydrating felt that advances in one direction. And dewatering the cement material on the dewatering felt through the dewatering felt, and curing and hardening the dewatered cement material to produce an inorganic plate. In producing the inorganic plate in this way, white water generated by dewatering the cement material on the dewatering felt is returned to the step of preparing the next other cement material without being discarded as wastewater,
Reuse is being done as part of the mixed water to prepare the next cement material. In other words, a new cement material is prepared by mixing and dispersing new water and white water that is not white water and solid content including cement and pulp,
As a result, it is possible to prevent solid matter such as cement contained in the white water from being wasted.
【０００３】[0003]
【発明が解決しようとする課題】しかし上記のように白
水を循環させて繰り返し再利用していると、パルプに含
まれている水溶性有機成分が白水に溶出して徐々に蓄積
されて白水のＣＯＤ（化学的酸素要求量）が高くなって
しまい、このため図２のように白水のＣＯＤが２５０ｐ
ｐｍ以上となると急激にセメント材料に発生する泡の量
が多くなり、この泡のために図３のようにセメント材料
の脱水（濾過）時間が長くなって、図４に示すように脱
水フェルトの進行速度を遅くしなければならず、生産性
が低下するという問題があった。また、白水のＣＯＤが
高くなると脱水されたセメント材料の硬化が遅延・阻害
されることになり、図５に示すように無機質板の曲げ強
度を高く発現させることができないという問題があっ
た。However, if the white water is circulated and reused repeatedly as described above, the water-soluble organic components contained in the pulp are eluted into the white water and gradually accumulated, and the white water is gradually accumulated. COD (Chemical Oxygen Demand) becomes high, and as a result, as shown in FIG.
pm or more, the amount of foam generated in the cement material rapidly increases, and due to this foam, the dewatering (filtration) time of the cement material becomes longer as shown in FIG. 3, and as shown in FIG. There was a problem that the traveling speed had to be slowed down and the productivity was reduced. Further, when the COD of the white water is increased, the hardening of the dehydrated cement material is delayed or inhibited, and there is a problem that the bending strength of the inorganic plate cannot be made high as shown in FIG.
【０００４】本発明は上記の点に鑑みてなされたもので
あり、生産性を低下させることなく強度の高い無機質板
を得ることができる無機質板の製造方法を提供すること
を目的とするものである。[0004] The present invention has been made in view of the above points, and has as its object to provide a method of manufacturing an inorganic plate capable of obtaining a high-strength inorganic plate without reducing productivity. is there.
【０００５】[0005]
【課題を解決するための手段】本発明の請求項１に記載
の無機質板の製造方法は、セメントとパルプを混合水と
混ぜてセメント材料を調製し、このセメント材料を脱水
して無機質板を形成し、セメント材料の脱水で生じた白
水を他のセメント材料を調製する混合水として用いる無
機質板の製造方法において、 （ａ）２０±２℃の蒸留水１０００ｃｃにポルトランド
セメント２００ｇとパルプ２０ｇ（乾燥重量）を添加し
てミキサーで５分間混合し、混合液Ａを調製する。 （ｂ）混合液Ａを濾過して濾水Ａを得る。 （ｃ）２０±２℃の蒸留水１０００ｃｃにポルトランド
セメント２００ｇを添加してミキサーで５分間混合し、
混合液Ｂを調製する。 （ｄ）混合液Ｂを濾過して濾水Ｂを得る。 （ｅ）パルプＣＯＤ＝（濾水ＡのＣＯＤ）−（濾水Ｂの
ＣＯＤ）を計算する。 上記（ａ）乃至（ｅ）で規定されるパルプＣＯＤが５ｐ
ｐｍ以下となるパルプを用いることを特徴とするもので
ある。According to the method of the present invention, a cement material is prepared by mixing cement and pulp with mixed water, and the cement material is dewatered to form an inorganic plate. A method for producing an inorganic plate using formed white water produced by dehydration of a cement material as a mixed water for preparing another cement material, comprising: (a) 200 g of Portland cement and 20 g of pulp in 1000 cc of distilled water at 20 ± 2 ° C. Weight) and mixing with a mixer for 5 minutes to prepare a mixture A. (B) The mixed solution A is filtered to obtain a filtrate A. (C) 200 g of Portland cement is added to 1000 cc of distilled water at 20 ± 2 ° C. and mixed with a mixer for 5 minutes,
Prepare mixture B. (D) The mixed solution B is filtered to obtain a filtrate B. (E) Calculate pulp COD = (COD of drainage A) − (COD of drainage B). Pulp COD defined in the above (a) to (e) is 5p
pulp or less is used.
【０００６】[0006]
【発明の実施の形態】以下、本発明の実施の形態を説明
する。セメント材料は固形分の濃度が１０重量％程度の
スラリー状であって、セメントとパルプと無機充填材と
珪酸質材料などの固形分を混合水と混ぜて分散させるこ
とによって調製される。セメントとしてはポルトランド
セメントを、無機充填材としては炭酸カルシウムやマイ
カを、珪酸質材料としてはフライアッシュや珪石粉をそ
れぞれ好適に用いることができる。Embodiments of the present invention will be described below. The cement material is a slurry having a solid content of about 10% by weight, and is prepared by mixing and dispersing solids such as cement, pulp, inorganic filler, and siliceous material with mixed water. Portland cement can be suitably used as the cement, calcium carbonate or mica can be suitably used as the inorganic filler, and fly ash or silica stone powder can be suitably used as the siliceous material.
【０００７】パルプとしてはパルプＣＯＤが５ｐｐｍ以
下のもののみを選択して用いる。パルプＣＯＤは次の
（ａ）乃至（ｅ）のようにして算出される。 （ａ）２０±２℃の蒸留水１０００ｃｃにポルトランド
セメント２００ｇとパルプ２０ｇ（乾燥重量）を添加し
てミキサーで５分間混合し、混合液Ａを調製する。 （ｂ）混合液Ａを濾過して濾水Ａを得る。 （ｃ）２０±２℃の蒸留水１０００ｃｃに（ａ）と同様
のポルトランドセメント２００ｇを添加してミキサーで
５分間混合し、混合液Ｂを調製する。 （ｄ）混合液Ｂを濾過して濾水Ｂを得る。 （ｅ）パルプＣＯＤ＝（濾水ＡのＣＯＤ）−（濾水Ｂの
ＣＯＤ）を計算する。尚、濾水Ａと濾水ＢのＣＯＤはＣ
ＯＤメーターを用いて測定する。As pulp, only those having a pulp COD of 5 ppm or less are used. Pulp COD is calculated as in the following (a) to (e). (A) 200 g of Portland cement and 20 g (dry weight) of Portland cement are added to 1000 cc of distilled water at 20 ± 2 ° C. and mixed with a mixer for 5 minutes to prepare a mixed solution A. (B) The mixed solution A is filtered to obtain a filtrate A. (C) 200 g of the same Portland cement as in (a) is added to 1000 cc of distilled water at 20 ± 2 ° C. and mixed with a mixer for 5 minutes to prepare a mixed solution B. (D) The mixed solution B is filtered to obtain a filtrate B. (E) Calculate pulp COD = (COD of drainage A) − (COD of drainage B). The COD of drainage A and drainage B is C
Measure using an OD meter.
【０００８】上記のように調製されたセメント材料を長
網式抄造法などの抄造法を用いて板状の原板に成形す
る。つまり、無端ループ状で透水性のある脱水フェルト
を一方向に進行させると共に脱水フェルト上にセメント
材料を抄き上げて供給し、脱水フェルト上に供給された
セメント材料に脱水フェルトを介して吸引を施して脱水
フェルト上のセメント材料を脱水することによって、脱
水フェルト上に原板を形成する。この後、脱水フェルト
から原板を取り外し、原板をオークレーブ養生などで養
生して硬化させることによって、無機質板を形成するこ
とができる。[0008] The cement material prepared as described above is formed into a plate-shaped original plate by using a papermaking method such as a fourdrinier papermaking method. In other words, the endless loop-shaped and water-permeable dewatering felt is advanced in one direction, and at the same time, the cement material is prepared and supplied on the dewatering felt, and suction is applied to the cement material supplied on the dewatering felt via the dewatering felt. To form a master plate on the dewatered felt by dewatering the cement material on the dewatered felt. Thereafter, the inorganic plate can be formed by removing the original plate from the dehydrated felt, curing the original plate with oak curing, and curing.
【０００９】脱水フェルト上のセメント材料を脱水する
ことによって生じる白水は、次の他の新たなセメント材
料を調製する工程に戻され、この新たなセメント材料を
調製する混合水の一部として再利用される。つまり、新
たなセメント材料は上記と同様の固形分を白水及び白水
でない新たな水と混合して分散させることによって調製
される。混合水中の白水と白水でない新たな水の割合は
４：１程度に設定することができる。The white water generated by dewatering the cement material on the dewatering felt is returned to the next step of preparing another new cement material and reused as part of the mixed water for preparing this new cement material. Is done. That is, a new cement material is prepared by mixing and dispersing the same solid content as above with fresh water and non-white water. The ratio of white water and non-white water in the mixed water can be set to about 4: 1.
【００１０】このようにして調製されたセメント材料を
上記と同様にして脱水フェルト上に供給すると共に脱水
フェルト上のセメント材料を脱水して原板を成形し、原
板を養生硬化することによって無機質板を形成する。そ
してこの無機質板を製造する際に生じた白水はさらに次
の他の新たなセメント材料を調製する工程に戻され、こ
の新たなセメント材料を調製する混合水の一部として再
利用される。The thus prepared cement material is supplied onto a dewatering felt in the same manner as described above, and the cement material on the dewatering felt is dewatered to form an original plate, and the original plate is cured and hardened to form an inorganic plate. Form. Then, the white water generated in manufacturing the inorganic plate is returned to the next step of preparing another new cement material, and is reused as a part of the mixed water for preparing the new cement material.
【００１１】上記のように白水を排水として廃棄せずに
循環させて繰り返し再利用することによって、白水に含
まれているセメントなどの固形分が無駄に廃棄されない
ようにすることができるものであるが、本発明ではパル
プとして上記（ａ）乃至（ｅ）で規定されるパルプＣＯ
Ｄが５ｐｐｍ以下となるものを用いるので、パルプから
白水に溶出される水溶性有機成分の量が少なくなって白
水のＣＯＤを高くなりにくくすることができる。従っ
て、白水を循環させて繰り返し再利用しても、セメント
材料に発生する泡の量が多くならないようにすることが
できると共に脱水されたセメント材料である原板の硬化
が遅延・阻害されないようにすることができる。尚、パ
ルプＣＯＤは小さいほど好ましいので、その下限は０で
ある。As described above, the white water is circulated without being discarded as wastewater, and is repeatedly reused, so that solids such as cement contained in the white water can be prevented from being wastefully discarded. However, in the present invention, the pulp CO defined by the above (a) to (e) is used as the pulp.
Since a material having a D of 5 ppm or less is used, the amount of water-soluble organic components eluted from the pulp into the white water is reduced, and the COD of the white water can be hardly increased. Therefore, even if white water is circulated and reused repeatedly, the amount of bubbles generated in the cement material can be prevented from increasing, and the hardening of the dewatered cement material base plate is not delayed or hindered. be able to. Note that the lower the pulp COD, the better, so the lower limit is 0.
【００１２】[0012]
【実施例】以下、本発明を実施例によって詳述する。 （実施例） （１）セメント４０重量部と、珪酸質材料４０重量部
と、パルプＣＯＤが５ｐｐｍ以下のパルプ６重量部と、
無機充填材１４重量部とからなる固形分を、白水でない
水に混合して分散させることによって、固形分濃度が１
０重量％のセメント材料を調製した。次に、このセメン
ト材料を脱水フェルト上に抄造すると共に脱水フェルト
上のセメント材料を吸引脱水して原板を形成し、この原
板を８０℃、２４時間の条件で養生した後、さらに１６
０℃、１２時間の条件で養生して無機質板を形成した。The present invention will be described below in detail with reference to examples. (Examples) (1) 40 parts by weight of cement, 40 parts by weight of a siliceous material, 6 parts by weight of pulp having a pulp COD of 5 ppm or less,
The solid content consisting of 14 parts by weight of the inorganic filler is mixed and dispersed in water other than white water, so that the solid content concentration is 1%.
A 0% by weight cement material was prepared. Next, the cement material is formed on a dewatered felt, and the cement material on the dewatered felt is suction-dehydrated to form an original plate. After curing the original plate at 80 ° C. for 24 hours, the original plate is further cured for 16 hours.
Curing was performed at 0 ° C. for 12 hours to form an inorganic plate.
【００１３】（２）直前の無機質板の製造で生じた白水
と白水でない通常の水とを４：１の割合で混ぜて混合水
を調製し、（１）と同様の固形分をこの混合水と混合し
て分散させることによって、固形分濃度が１０重量％の
セメント材料を調製した。このセメント材料から（１）
と同様にして無機質板を形成した。 （３）上記（２）を１日４回行った後、ＣＯＤメーター
で白水のＣＯＤを測定した。(2) A mixed water is prepared by mixing white water produced in the immediately preceding production of the inorganic plate with ordinary water which is not white water at a ratio of 4: 1 to obtain a mixed water. And a cement material having a solid concentration of 10% by weight was prepared by mixing and dispersing. From this cement material (1)
An inorganic plate was formed in the same manner as described above. (3) After performing the above (2) four times a day, the COD of the white water was measured with a COD meter.
【００１４】（比較例）パルプＣＯＤが３０ｐｐｍのパ
ルプを用いた以外は上記実施例と同様にして無機質板を
製造し、また白水のＣＯＤを測定した。上記実施例と比
較例の（３）の結果を図１に示す。このグラフから明ら
かなように、実施例の白水のＣＯＤ（図１に実線で示
す）は３０日経過後であっても非常に小さく、また増加
傾向が全く見られないが、比較例の白水（図１に破線で
示す）は約６日間で無機質板を安定して製造することが
できるＣＯＤ（２５０ｐｐｍで図１に想像線で示す）を
超え、しかもさらに増加傾向が見られる。従って、実施
例では３０日間あるいはそれ以上、白水を循環させて繰
り返し再利用し続けても白水のＣＯＤが２５０ｐｐｍを
超えないので、図４から明らかなように無機質板の生産
性が低下することがなく、また図５から明らかなように
無機質板の曲げ強度が低下することもない。Comparative Example An inorganic plate was manufactured in the same manner as in the above example except that pulp having a COD of 30 ppm was used, and the COD of white water was measured. FIG. 1 shows the results of (3) of the above example and comparative example. As is clear from this graph, the COD of the white water of the example (shown by a solid line in FIG. 1) is very small even after 30 days have passed, and there is no tendency to increase. 1 indicates a COD (indicated by an imaginary line in FIG. 1 at 250 ppm) at which the inorganic plate can be stably manufactured in about 6 days, and a further increasing tendency is observed. Accordingly, in the example, even if the white water is circulated and reused repeatedly for 30 days or more, the COD of the white water does not exceed 250 ppm, so that the productivity of the inorganic plate may decrease as is apparent from FIG. Further, as is clear from FIG. 5, the bending strength of the inorganic plate does not decrease.
【００１５】[0015]
【発明の効果】上記のように本発明の請求項１に記載の
発明は、セメントとパルプを混合水と混ぜてセメント材
料を調製し、このセメント材料を脱水して無機質板を形
成し、セメント材料の脱水で生じた白水を他のセメント
材料を調製する混合水として用いる無機質板の製造方法
において、上記（ａ）乃至（ｅ）で規定されるパルプＣ
ＯＤが５ｐｐｍ以下となるパルプを用いるので、パルプ
から白水に溶出される水溶性有機成分の量が少なくなっ
て白水のＣＯＤを高くなりにくくすることができ、白水
を循環させて繰り返し再利用しても、セメント材料に発
生する泡の量が多くならないようにすることができると
共に脱水されたセメント材料の硬化が遅延・阻害されな
いようにすることができるものであり、従って、生産性
を低下させることなく強度の高い無機質板を得ることが
できるものである。As described above, according to the first aspect of the present invention, a cement material is prepared by mixing cement and pulp with mixed water, and the cement material is dehydrated to form an inorganic plate. In a method for producing an inorganic plate, wherein white water generated by dehydration of a material is used as mixed water for preparing another cement material, the pulp C defined in the above (a) to (e) is used.
Since pulp having an OD of 5 ppm or less is used, the amount of water-soluble organic components eluted from the pulp into the white water is reduced, so that the COD of the white water can be hardly increased, and the white water is circulated and reused repeatedly. In addition, the amount of foam generated in the cement material can be prevented from increasing, and at the same time, the hardening of the dehydrated cement material can be prevented from being delayed or hindered. Thus, an inorganic plate having high strength can be obtained.
【図１】本発明の実施例と比較例における白水の経日変
化を示すグラフである。FIG. 1 is a graph showing daily changes of white water in Examples of the present invention and Comparative Examples.
【図２】白水のＣＯＤとこの白水を用いたセメント材料
の泡の量の関係を示すグラフである。FIG. 2 is a graph showing the relationship between the COD of white water and the amount of foam of a cement material using the white water.
【図３】セメント材料の泡の量と脱水時間（濾過時間）
の関係を示すグラフである。Fig. 3 Amount of foam and dewatering time (filtration time) of cement material
6 is a graph showing the relationship of.
【図４】白水のＣＯＤとこの白水を用いたセメント材料
を抄造する際に用いる脱水ベルトの進行速度の関係を示
すグラフである。FIG. 4 is a graph showing the relationship between the COD of white water and the traveling speed of a dewatering belt used for making a cement material using the white water.
【図５】白水のＣＯＤとこの白水を用いたセメント材料
で形成される無機質板の曲げ強度の関係を示すグラフで
ある。FIG. 5 is a graph showing the relationship between the COD of white water and the bending strength of an inorganic plate formed of a cement material using the white water.
Claims (1)
ント材料を調製し、セメント材料を脱水して無機質板を
形成し、このセメント材料を脱水した際に生じる白水を
他のセメント材料を調製する混合水として用いる無機質
板の製造方法において、 （ａ）２０±２℃の蒸留水１０００ｃｃにポルトランド
セメント２００ｇとパルプ２０ｇ（乾燥重量）を添加し
てミキサーで５分間混合し、混合液Ａを調製する。 （ｂ）混合液Ａを濾過して濾水Ａを得る。 （ｃ）２０±２℃の蒸留水１０００ｃｃにポルトランド
セメント２００ｇを添加してミキサーで５分間混合し、
混合液Ｂを調製する。 （ｄ）混合液Ｂを濾過して濾水Ｂを得る。 （ｅ）パルプＣＯＤ＝（濾水ＡのＣＯＤ）−（濾水Ｂの
ＣＯＤ）を計算する。 上記（ａ）乃至（ｅ）で規定されるパルプＣＯＤが５ｐ
ｐｍ以下となるパルプを用いることを特徴とする無機質
板の製造方法。1. A cement material is prepared by mixing cement and pulp with mixed water, a cement material is dehydrated to form an inorganic plate, and white water generated when the cement material is dehydrated is prepared for another cement material. In the method for producing an inorganic plate used as mixed water, (a) 200 g of Portland cement and 20 g (dry weight) of Portland cement are added to 1000 cc of distilled water at 20 ± 2 ° C., and mixed with a mixer for 5 minutes to prepare a mixed solution A . (B) The mixed solution A is filtered to obtain a filtrate A. (C) 200 g of Portland cement is added to 1000 cc of distilled water at 20 ± 2 ° C. and mixed with a mixer for 5 minutes,
Prepare mixture B. (D) The mixed solution B is filtered to obtain a filtrate B. (E) Calculate pulp COD = (COD of drainage A) − (COD of drainage B). Pulp COD defined in the above (a) to (e) is 5p
A method for producing an inorganic plate, comprising using pulp having a pm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16832097A JPH1110631A (en) | 1997-06-25 | 1997-06-25 | Manufacture of inorganic plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16832097A JPH1110631A (en) | 1997-06-25 | 1997-06-25 | Manufacture of inorganic plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1110631A true JPH1110631A (en) | 1999-01-19 |
Family
ID=15865857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16832097A Withdrawn JPH1110631A (en) | 1997-06-25 | 1997-06-25 | Manufacture of inorganic plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1110631A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1435409A2 (en) * | 2002-12-26 | 2004-07-07 | Weyerhaeuser Company | Very low cod unbleached pulp |
| JP2013142680A (en) * | 2012-01-12 | 2013-07-22 | Kmew Co Ltd | Evaluation method of pulp for cement hardened body |
| US8993462B2 (en) | 2006-04-12 | 2015-03-31 | James Hardie Technology Limited | Surface sealed reinforced building element |
-
1997
- 1997-06-25 JP JP16832097A patent/JPH1110631A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1435409A2 (en) * | 2002-12-26 | 2004-07-07 | Weyerhaeuser Company | Very low cod unbleached pulp |
| EP1435409A3 (en) * | 2002-12-26 | 2008-10-08 | Weyerhaeuser Company | Very low cod unbleached pulp |
| US8993462B2 (en) | 2006-04-12 | 2015-03-31 | James Hardie Technology Limited | Surface sealed reinforced building element |
| JP2013142680A (en) * | 2012-01-12 | 2013-07-22 | Kmew Co Ltd | Evaluation method of pulp for cement hardened body |
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