JPS61122143A - Manufacture of dry gypsum dihydrate containing lime - Google Patents
Manufacture of dry gypsum dihydrate containing limeInfo
- Publication number
- JPS61122143A JPS61122143A JP59239567A JP23956784A JPS61122143A JP S61122143 A JPS61122143 A JP S61122143A JP 59239567 A JP59239567 A JP 59239567A JP 23956784 A JP23956784 A JP 23956784A JP S61122143 A JPS61122143 A JP S61122143A
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- quicklime
- dry
- powder
- lime
- 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.)
- Pending
Links
- 239000010440 gypsum Substances 0.000 title claims description 60
- 229910052602 gypsum Inorganic materials 0.000 title claims description 60
- 150000004683 dihydrates Chemical class 0.000 title claims description 26
- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims description 19
- 235000011941 Tilia x europaea Nutrition 0.000 title claims description 19
- 239000004571 lime Substances 0.000 title claims description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000000843 powder Substances 0.000 claims description 50
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 49
- 239000000292 calcium oxide Substances 0.000 claims description 25
- 235000012255 calcium oxide Nutrition 0.000 claims description 24
- 239000000920 calcium hydroxide Substances 0.000 claims description 10
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000006297 dehydration reaction Methods 0.000 claims description 6
- 230000036571 hydration Effects 0.000 claims description 4
- 238000006703 hydration reaction Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 239000006227 byproduct Substances 0.000 claims 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims 1
- 229910019142 PO4 Inorganic materials 0.000 claims 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- 238000006477 desulfuration reaction Methods 0.000 claims 1
- 230000023556 desulfurization Effects 0.000 claims 1
- 239000003546 flue gas Substances 0.000 claims 1
- 239000010452 phosphate Substances 0.000 claims 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims 1
- 238000001035 drying Methods 0.000 description 10
- 239000002893 slag Substances 0.000 description 10
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 8
- 235000011116 calcium hydroxide Nutrition 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 239000004568 cement Substances 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229910052925 anhydrite Inorganic materials 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000002274 desiccant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000003516 soil conditioner Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、含水二水石膏を原料として、石灰を含有した
乾燥二水石膏粉末を経済的に製造し、これを、セメント
関連産業、土質改良材関連産業、あるいは、建築材料関
連産業等に、原材料として提供するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention economically produces dry dihydrate gypsum powder containing lime using hydrated dihydrate gypsum as a raw material, and uses it in cement-related industries, soil quality, etc. It is provided as a raw material to industries related to improved materials or construction materials.
〈従来の技術〉
従来技術の乾燥二水石膏粉末の製造方法は、含水二水石
膏を各種のドライヤー、例えば、バドルドライヤー、ロ
ータリードライヤー、あるいは、気流乾燥機等により乾
燥し、これを粉砕する。石灰を含有した乾燥二水石膏粉
末を得るには、乾燥二本石膏粉末に、消石灰粉末あるい
は生石灰粉末を、後で添加混合する。<Prior Art> In the conventional method for producing dried gypsum powder, hydrated gypsum is dried using various dryers such as a paddle dryer, a rotary dryer, or a flash dryer, and then pulverized. To obtain dry dihydrate gypsum powder containing lime, slaked lime powder or quicklime powder is added and mixed with the dried dihydrate gypsum powder later.
〈発明が解決しようとする問題点〉
従来から、乾燥二本石膏粉末の需要が少なく、また、従
来技術のドライヤーによる含水二水石膏の乾燥は、設備
投資額が大規模となり、大量消費が見込めなかったこと
もあって、石膏乾燥の企業化は遅れ、工業用原材料とし
ての乾燥二本石膏粉末は、市場に提供されていないのが
現状である。<Problems to be solved by the invention> Traditionally, demand for dried dihydrate gypsum powder has been low, and drying hydrated dihydrate gypsum using a conventional dryer requires a large amount of capital investment and is not expected to be consumed in large quantities. As a result, the commercialization of gypsum drying has been delayed, and dry gypsum powder as an industrial raw material is not currently available on the market.
しかし、近年になって、土質改良材関連産業においては
、セメントあるいは石灰に、予め、乾燥石膏粉末を添加
混合しておくと、土質改良材としての性能が向上するこ
とにより、乾燥石膏粉末を添加混合した土質改良材が製
造されるようになってきた。しかし、安価な乾燥二本石
膏粉末の入手が困難なため、高価な無水石膏粉末を代用
しているのが現状である。なお、セメントに乾燥石膏粉
末を添加混合する場合は、石灰粉末も添加混合しておく
と、土質改良材としての性能が向上する。よって、乾燥
二本石膏粉末は、石灰を含有する乾燥二水石膏粉末であ
ることが望ましい。However, in recent years, industries related to soil conditioners have discovered that adding dry gypsum powder to cement or lime in advance improves its performance as a soil conditioner. Mixed soil improvement materials have come to be manufactured. However, because it is difficult to obtain inexpensive dried gypsum powder, expensive anhydrite powder is currently used instead. In addition, when adding and mixing dry gypsum powder to cement, if lime powder is also added and mixed, the performance as a soil conditioner will improve. Therefore, it is desirable that the dry dihydrate gypsum powder contains lime.
一方、セメント関連産業においても、近年になって、高
炉水砕スラグ微粉末が企業化され、この高炉水砕スラグ
微粉末は、少量の二水石膏粉末を添加混合することが好
ましい。しかし、高炉水砕スラグ微粉末の製造に際して
、高炉水砕スラグと含水二水石膏を同時粉砕すると、商
品として不都合な偽凝結現象を示す高炉水砕スラグ微粉
末となるため、この製造方式が取れないと言う問題点が
ある。よって、高炉水砕スラグ微粉末には、従来技術に
より別に乾燥した乾燥二本石膏粉末を添加混合するか、
あるいは、高価な無水石膏粉末を代用している場合があ
る。また、近年の需要の多様化に伴い、高炉水砕スラグ
黴粉末または／およびフライアッシュ等を添加混合した
各種の混合セメントの需要も多くなってきた。この場合
、石膏粉末を含まない高炉水砕スラグ黴粉末またはフラ
イアッシュ等を添加混合すると、セメントとしての必要
な石膏量が不足するために、やはり、従来技術により別
に乾燥した乾燥二本石膏粉末を添加混合するか、または
、高価な無水石膏粉末を代用している場合がある。これ
らの場合、添加混合する乾燥二本石膏粉末に、少量の消
石灰が含まれていても問題はなく、特に、高炉水砕スラ
グ微粉末が添加混合されている場合には、むしろ、高炉
水砕スラグ微粉末の水和促進剤として、消石灰が含まれ
ていることが望ましい。On the other hand, in recent years, granulated blast furnace slag powder has been commercialized in the cement-related industry, and it is preferable to add and mix a small amount of dihydrate gypsum powder to this granulated blast furnace slag powder. However, when producing granulated blast furnace slag powder, if granulated blast furnace slag and hydrous dihydrate gypsum are simultaneously ground, the resulting granulated blast furnace slag powder will exhibit a false agglomeration phenomenon, which is inconvenient for the product. There is a problem that there is no such thing. Therefore, to the granulated blast furnace slag powder, dry gypsum powder, which has been dried separately using conventional techniques, is added and mixed, or
Alternatively, expensive anhydrite powder may be substituted. In addition, with the diversification of demand in recent years, there has been an increase in demand for various mixed cements containing granulated blast furnace slag mold powder and/or fly ash. In this case, if granulated blast furnace slag mold powder or fly ash, etc. that does not contain gypsum powder is added and mixed, the amount of gypsum necessary for cement will be insufficient. It may be added or mixed or substituted with expensive anhydrite powder. In these cases, there is no problem even if the dry gypsum powder to be added and mixed contains a small amount of slaked lime.In particular, when granulated blast furnace slag powder is added and mixed, it is rather It is desirable that slaked lime be included as a hydration accelerator for the fine slag powder.
更には、建築材料関連産業においても、近年の高級材料
指向に伴い、原量の一部に乾燥二本石膏粉末を使用した
、高級建築材料が製造されるようになってきた。高級建
築材料の原料の組合わせ、゛あるいは、製造方法の種類
によっては、添加混合する乾燥二本石膏は、石灰を含有
する乾燥二水石膏粉末であることが望ましく、生石灰の
発熱反応を利用して、硬化促進を計る場合には、生石灰
粉末を含有した乾燥二本石膏粉末であることが望ましい
。Furthermore, in the building material related industry, with the recent trend toward high-quality materials, high-grade building materials using dried Nihon gypsum powder as part of the raw material have come to be manufactured. Depending on the combination of raw materials for high-grade building materials, or the type of manufacturing method, it is preferable that the dry dihydrate gypsum to be added and mixed is a dry dihydrate gypsum powder containing lime, which uses the exothermic reaction of quicklime. When accelerating hardening, it is desirable to use dry gypsum powder containing quicklime powder.
このように、石灰を含有する乾燥二水石膏粉末の需要が
、増大傾向にあるにもかかわらず、従来技術のドライヤ
ーによる含水二水石膏の乾燥は、設備投ｙＲ額が大規模
となり、まだまだ大量消費が見込めないこともあって、
経済的に成立たず、石膏乾燥の工業化は遅れ、工業用原
材料としての石灰を含有する乾燥二水石膏粉末は、市場
に提供されていないのが現状である。Although the demand for dry dihydrate gypsum powder containing lime is on the rise, the drying of hydrated dihydrate gypsum using conventional dryers requires a large amount of equipment and is still in large quantities. Because consumption cannot be expected,
It is not economically viable, the industrialization of gypsum drying has been delayed, and at present, dry gypsum powder containing lime as an industrial raw material is not provided on the market.
く問題点を解決するための手段〉
本発明は、上記従来の問題点に鑑み、ｉ来技術のドライ
ヤーによる含水二水石膏の乾燥に代り、含水二水石膏の
経済的な乾燥方法で、かつ、石灰を含有した乾燥二本石
膏粉末を、安価に提供することにある。Means for Solving the Problems> In view of the above-mentioned conventional problems, the present invention provides an economical method for drying hydrated gypsum, instead of drying hydrated gypsum using a dryer in the prior art, and An object of the present invention is to provide dry gypsum powder containing lime at a low cost.
含水二水石膏を乾燥させる脱水乾燥材として、生石灰に
着目し、研究を行った結果、含水二水石膏に生石灰を添
加混合し、生石灰の水ｆ口発熱脱水反応を利用して、消
石灰を含有する。We focused on quicklime as a dehydrating drying agent for drying hydrated dihydrate gypsum, and as a result of our research, we added and mixed quicklime to hydrated dihydrate gypsum, and by utilizing the water exothermic dehydration reaction of quicklime, we created a product that contains slaked lime. do.
または、消石灰と生石灰を含有する乾燥二本石膏粉末の
経済的な製造方法を発明するに至った。Alternatively, an economical method for producing dry gypsum powder containing slaked lime and quicklime was invented.
く作 用〉
生石灰を、含水二水石膏に添加混合すると、生石灰と含
水二水石膏中の水が反応し、この反応が発熱反応である
ために、混合物は高温になり、含水二水石膏中の水の一
部は水蒸気として散逸し、残りの水は、生石灰と反応し
て消石灰になり、混合物は乾燥状態になる。Effect> When quicklime is added and mixed with hydrated dihydrate gypsum, the quicklime reacts with the water in the hydrated dihydrate, and since this reaction is an exothermic reaction, the mixture becomes high temperature, and the water in the hydrated dihydrate gypsum reacts with the quicklime. Some of the water is dissipated as steam, and the remaining water reacts with the quicklime to form slaked lime, leaving the mixture dry.
く実 施 例ン
以下本考案の実施例に基づいて説明する。含水二水石膏
の脱水乾燥は、含水二水石膏と生石灰とが十分に混合撹
拌され、かつ、脱水乾燥に必要な滞留時間を有する混合
機を使用する。混合機は、例えば、パドルミキサーのよ
うなもので良く連続式が望ましい。この際に、パドルの
回転数が過大にならないようにｆｔ、ｌＪ御し、二本石
膏が高温になって、半水石膏に転移しない温度範囲とす
ることが必要である。また、混合機から発生する大量の
水蒸気に連行する粉層は、公害防止のため集塵する必要
がある。Embodiment The present invention will be explained below based on an embodiment. For dehydration and drying of hydrated gypsum, a mixer is used that can sufficiently mix and stir hydrated gypsum and quicklime and has a residence time necessary for dehydration and drying. The mixer may be, for example, a paddle mixer, preferably a continuous type. At this time, it is necessary to control ft and lJ so that the number of rotations of the paddle does not become excessive, and to maintain a temperature range in which the two-piece gypsum does not become high temperature and transform into hemihydrate gypsum. In addition, the powder layer entrained in the large amount of water vapor generated from the mixer needs to be collected to prevent pollution.
混合機から出た乾燥混合物中には、塊状物が含まれるこ
とがあるので、これを解砕して粉状または砂状にする必
要がある。石灰を含有する乾燥二本石膏粉末を、土質改
良材の原材料として使用する場合には、土質改良施工時
の発塵防止のため、砂状に解砕することが好ましく、土
質改良材以外の用途に使用する場合は、粉状が好ましい
。The dry mixture that comes out of the mixer may contain lumps, which need to be crushed into powder or sand. When dry Nihon gypsum powder containing lime is used as a raw material for soil improvement materials, it is preferable to crush it into sand to prevent dust generation during soil improvement construction, and it is not suitable for uses other than soil improvement materials. When used in , powder form is preferable.
〈発明の効果〉
本発明による石灰を含有する乾燥二本石膏粉末の製造方
法の経済性について言及し、発明の詳細な説明する。<Effects of the Invention> The invention will be described in detail with reference to the economical efficiency of the method for producing dry gypsum powder containing lime according to the invention.
例えば、水分を含む二本石膏を燃料を用いて乾燥するた
めには、段違投資額が過大となるドライヤーが必要とな
り、特に、消石灰を含有する乾燥二本石膏粉末の製造に
おいては、別に、わざわざ生石灰を水に加えて消化した
消石灰を、混合機を使用して添加混合する従来技術によ
る方法に比較して、経済的であることは言うまでもない
。For example, in order to dry Nihon gypsum containing water using fuel, a dryer that requires an excessive investment is required. In particular, in the production of dry Nihon gypsum powder containing slaked lime, Needless to say, this method is more economical than the conventional method in which quicklime is added to water and digested slaked lime is added and mixed using a mixer.
生石灰を乾燥材兼添加材として利用する本発明の石灰を
含有する乾燥二本石膏粉末の製造方法は、乾燥と混合を
同一段違で行うため、小容量の混合機でも、石灰を含有
する乾燥二本石膏粉末の多量生産が可能である。The method for producing dry lime-containing dry gypsum powder of the present invention, which uses quicklime as a drying agent and additive, performs drying and mixing in the same stage, so even a small-capacity mixer can produce dry lime-containing gypsum powder. It is possible to mass produce Nihon gypsum powder.
以上のように、今後、需要が増大することが見込まれる
石灰を含有する乾燥二水石膏粉末を、経済的に製造する
方法を開発した本発明の有用性は大きい。As described above, the present invention, which has developed a method for economically producing dry dihydrate gypsum powder containing lime, whose demand is expected to increase in the future, is highly useful.
特許出願人 第一セメント株式会社
代 理 人 平 井
部手続補正書（方式）
％式％
１、事件の表示 特願昭 ５９−２３９５６７号３
．４正をする者
事件との関係 特 許 出 願 人第−セメント株
式会社
４、代理人Patent applicant: Daiichi Cement Co., Ltd. Representative: Hirai Hirai
Department procedure amendment (method) % formula % 1. Indication of case Patent application No. 59-239567 3
．． 4.Relationship with the case of a person who commits corrective action Patent application Person No. 4 - Cement Co., Ltd., Agent
Claims (4)
内で、生石灰を添加混合し、生石灰の水和発熱脱水反応
を利用して、乾燥状態の二水和石膏−消石灰混合物を得
、これを粉状に解砕することを特徴とする石灰を含有す
る乾燥二水石膏の製造方法。(1) Quicklime is added to and mixed with the dihydrate gypsum to the extent that unhydrated quicklime does not remain, and a dry dihydrated gypsum-slaked lime mixture is obtained by utilizing the hydration exothermic dehydration reaction of quicklime. A method for producing dry gypsum containing lime, which comprises crushing the same into powder.
内で、生石灰を添加混合し、生石灰の水和発熱脱水反応
を利用して、乾燥状態の二水石膏−消石灰混合物を得た
後に、必要に応じた量の生石灰を添加混合し、これを粉
状または砂状に解砕することを特徴とする石灰を含有す
る乾燥二水石膏の製造方法。(2) Quicklime was added to and mixed with hydrated dihydrate gypsum to the extent that no unhydrated quicklime remained, and a dry gypsum-slaked lime mixture was obtained by utilizing the hydration exothermic dehydration reaction of quicklime. A method for producing dry dihydrate gypsum containing lime, which comprises subsequently adding and mixing a necessary amount of quicklime and crushing it into powder or sand.
が残留する範囲で、生石灰を添加混合し、生石灰の水和
発熱脱水反応を利用して、乾燥状態の二水石膏−消石灰
−生石灰混合物を得、これを粉状または砂状に解砕する
ことを特徴とする石灰を含有する乾燥二水石膏の製造方
法。(3) Add and mix quicklime to the hydrated dihydrate gypsum to the extent that the required amount of unhydrated quicklime remains, and use the hydration exothermic dehydration reaction of quicklime to remove the dry dihydrate gypsum. A method for producing dry dihydrate gypsum containing lime, which comprises obtaining a slaked lime-quicklime mixture and crushing it into powder or sand.
石膏、あるいは、チタン酸副生石膏等の内の一種類また
は二種類以上の混合物である特許請求の範囲第（１）項
、第２項、第（３）項記載の石灰を含有する乾燥二水石
膏の製造方 法。(4) Claim (1), wherein the hydrated gypsum is one or a mixture of two or more of flue gas desulfurization gypsum, phosphate by-product gypsum, titanate by-product gypsum, etc. 2. A method for producing dry gypsum containing lime as described in item 2 and item (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59239567A JPS61122143A (en) | 1984-11-15 | 1984-11-15 | Manufacture of dry gypsum dihydrate containing lime |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59239567A JPS61122143A (en) | 1984-11-15 | 1984-11-15 | Manufacture of dry gypsum dihydrate containing lime |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61122143A true JPS61122143A (en) | 1986-06-10 |
Family
ID=17046716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59239567A Pending JPS61122143A (en) | 1984-11-15 | 1984-11-15 | Manufacture of dry gypsum dihydrate containing lime |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61122143A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61227953A (en) * | 1985-04-03 | 1986-10-11 | 第一セメント株式会社 | Manufacture of gypsum lime composition |
| JP2015000823A (en) * | 2013-06-13 | 2015-01-05 | チヨダウーテ株式会社 | Method for drying dihydrate gypsum powder comprising surplus moisture |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4939915A (en) * | 1972-08-28 | 1974-04-15 | ||
| JPS513399A (en) * | 1974-06-28 | 1976-01-12 | Onoda Cement Co Ltd | Setsukono kashohoho oyobi sochi |
| JPS5154096A (en) * | 1974-11-06 | 1976-05-12 | Nippon Kokan Kk | Ryujosetsukono seizohoho |
| JPS53146728A (en) * | 1977-05-27 | 1978-12-20 | Ishikawajima Harima Heavy Ind | Dry refining method for silica sand and apparatus for it |
| JPS5544338A (en) * | 1978-09-26 | 1980-03-28 | Akijirou Kameyama | Treating method of household sewage settling sludge and treated matter thereof |
-
1984
- 1984-11-15 JP JP59239567A patent/JPS61122143A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4939915A (en) * | 1972-08-28 | 1974-04-15 | ||
| JPS513399A (en) * | 1974-06-28 | 1976-01-12 | Onoda Cement Co Ltd | Setsukono kashohoho oyobi sochi |
| JPS5154096A (en) * | 1974-11-06 | 1976-05-12 | Nippon Kokan Kk | Ryujosetsukono seizohoho |
| JPS53146728A (en) * | 1977-05-27 | 1978-12-20 | Ishikawajima Harima Heavy Ind | Dry refining method for silica sand and apparatus for it |
| JPS5544338A (en) * | 1978-09-26 | 1980-03-28 | Akijirou Kameyama | Treating method of household sewage settling sludge and treated matter thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61227953A (en) * | 1985-04-03 | 1986-10-11 | 第一セメント株式会社 | Manufacture of gypsum lime composition |
| JP2015000823A (en) * | 2013-06-13 | 2015-01-05 | チヨダウーテ株式会社 | Method for drying dihydrate gypsum powder comprising surplus moisture |
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