DK557081A - Fremgangsmaade og anlaeg til fremstilling af en toer cementblanding - Google Patents

Fremgangsmaade og anlaeg til fremstilling af en toer cementblanding

Info

Publication number: DK557081A
Authority: DK; Denmark
Prior art keywords: cement; starting material; mill; ferrous sulphate; plant
Prior art date: 1980-12-17

Application number

DK557081A

Other languages

English (en)

Other versions

DK147637C (da

DK147637B (da

Inventor

P L Rasmussen

Original Assignee

Aalborg Portland Cement

Priority date (The priority date 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 date listed.)

1980-12-17

Filing date

1981-12-15

Publication date

1982-06-18

Family has litigation

First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26067362&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DK557081(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

1981-12-15 Application filed by Aalborg Portland Cement filed Critical Aalborg Portland Cement

1981-12-15 Priority to DK557081A priority Critical patent/DK147637C/da

1982-06-18 Publication of DK557081A publication Critical patent/DK557081A/da

1983-09-26 Priority to DK440383A priority patent/DK440383D0/da

1983-09-26 Priority to DK440483A priority patent/DK149342C/da

1984-05-24 Priority to DK256984A priority patent/DK148794C/da

1984-10-29 Publication of DK147637B publication Critical patent/DK147637B/da

1985-05-13 Application granted granted Critical

1985-05-13 Publication of DK147637C publication Critical patent/DK147637C/da

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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/149—Iron-sulfates
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
- C04B2111/1075—Chromium-free or very low chromium-content materials
- C04B2111/1081—Chromium VI, e.g. for avoiding chromium eczema

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Ceramic Engineering (AREA)
Materials Engineering (AREA)
Structural Engineering (AREA)
Organic Chemistry (AREA)
Inorganic Chemistry (AREA)
Curing Cements, Concrete, And Artificial Stone (AREA)
Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Soil Conditioners And Soil-Stabilizing Materials (AREA)
Golf Clubs (AREA)
Bulkheads Adapted To Foundation Construction (AREA)
Paints Or Removers (AREA)
Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Graft Or Block Polymers (AREA)
Sampling And Sample Adjustment (AREA)
Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Analysing Materials By The Use Of Radiation (AREA)

DK557081A 1980-12-17 1981-12-15 Fremgangsmaade og anlaeg til fremstilling af cement DK147637C (da)

Priority Applications (4)

Application Number	Priority Date	Filing Date	Title
DK557081A DK147637C (da)	1980-12-17	1981-12-15	Fremgangsmaade og anlaeg til fremstilling af cement
DK440383A DK440383D0 (da)	1980-12-17	1983-09-26	Fremgangsmade og anlaeg til fremstilling af en toer cementsammensaetning
DK440483A DK149342C (da)	1980-12-17	1983-09-26	Toer cementsammensaetning og fremgangsmaade til fremstilling deraf
DK256984A DK148794C (da)	1980-12-17	1984-05-24	Toer cementsammensaetning

Applications Claiming Priority (6)

Application Number	Priority Date	Filing Date	Title
DK538080		1980-12-17
DK538080		1980-12-17
DK414081		1981-09-17
DK414081		1981-09-17
DK557081		1981-12-15
DK557081A DK147637C (da)	1980-12-17	1981-12-15	Fremgangsmaade og anlaeg til fremstilling af cement

Publications (3)

Publication Number	Publication Date
DK557081A true DK557081A (da)	1982-06-18
DK147637B DK147637B (da)	1984-10-29
DK147637C DK147637C (da)	1985-05-13

Family

ID=26067362

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
DK557081A DK147637C (da)	1980-12-17	1981-12-15	Fremgangsmaade og anlaeg til fremstilling af cement

Country Status (17)

Country	Link
US (2)	US4572739A (da)
EP (3)	EP0160746B1 (da)
JP (1)	JPS57501961A (da)
AT (2)	ATE36512T1 (da)
AU (1)	AU545867B2 (da)
BR (1)	BR8108922A (da)
CA (1)	CA1178976A (da)
DD (1)	DD201882A5 (da)
DE (3)	DE3176847D1 (da)
DK (1)	DK147637C (da)
ES (1)	ES8304046A1 (da)
FI (3)	FI822844A7 (da)
IE (3)	IE891754L (da)
IS (2)	IS1443B6 (da)
NO (2)	NO163223C (da)
PL (1)	PL136035B1 (da)
WO (1)	WO1982002040A1 (da)

Families Citing this family (41)

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JPS59501825A (ja) *	1982-11-17	1984-11-01	アクテイ−ゼルスカベツト　アアルボルグ　ポ−トランド−セメント−フアブリク	紛末特性の改良方法
GR79711B (da) *	1983-01-20	1984-10-31	Cementa Ab
US4962006A (en) *	1988-02-24	1990-10-09	Color-Crete	Method of coloring cement
US5268159A (en) *	1990-01-30	1993-12-07	Bayer Aktiengesellschaft	Process for the production of storable, free-flowing hydrated ferrous sulfate
DK93690D0 (da) *	1990-04-11	1990-04-11	Aalborg Portland Cement	Cementkomposition
JPH07115895B2 (ja) *	1990-07-19	1995-12-13	株式会社ネオテック	生コンクリート等の洗い残渣再利用法及びその装置
DE4321077A1 (de)	1993-06-24	1995-01-05	Dyckerhoff Ag	Verfahren zur Depression der Allergien verursachenden Wirkung von wasserlöslichem Cr·V··I· in Zementen und/oder zementhaltigen Zubereitungen
IT1274718B (it) *	1994-08-19	1997-07-24	Italcementi Spa	Cementi esenti da cromati e un procedimento per la loro preparazione
US5792384A (en) *	1997-01-31	1998-08-11	Warren; James R.	Concrete masons' hand rinse
DE19744035C2 (de) *	1997-10-06	2000-09-28	Verein Deutscher Zementwerke E	Verfahren zur Zugabe eines Zusatzmittels zu einem Zement, der Hautekzeme verursachendes Chromat enthält und dem Eisen(II)-sulfat zugemischt wird
DE19833603C2 (de) *	1998-07-25	2000-06-15	Economic Versicherungs Vermitt	Verwendung von Zinn(II)sulfat
SK282086B6 (sk) *	1999-10-12	2001-10-08	Pova�Sk� Cement�Re�, A. S.	Spôsob výroby cementu so zníženým obsahom chrómu
BG64752B1 (bg) *	1999-12-14	2006-02-28	Cementarny A Vapenky Prachovice, A.S.	Метод за обогатяване на сух цимент
TW576825B (en)	2000-08-10	2004-02-21	Iner Ae	Method for liquid chromate ion and oxy-metal ions removal and stabilization
FR2844448B1 (fr)	2002-09-17	2006-06-23	Lcw Les Colorants Wackherr	Methode de preparation extemporanee de compositions cosmetiques ayant la texture d'une creme, et compositions pour la mise en oeuvre de cette methode
FR2844800B1 (fr) *	2002-09-19	2006-07-21		Pigments d'oxyde de chrome a teneur reduite en chrome(vi)
DE20311049U1 (de) *	2003-07-17	2003-09-18	Ferro Duo GmbH, 47053 Duisburg	Hydraulisches Bindemittel
DE10332530A1 (de) *	2003-07-17	2005-02-10	Kerr-Mcgee Pigments Gmbh	Verfahren zur Reduktion des löslichen Chromatgehaltes in Zement sowie eine Zubereitung aus Zement und wasserlöslichen Metallsulfaten
US7128782B2 (en)	2003-11-21	2006-10-31	W.R. Grace & Co.-Conn.	Sulfate dispersion chromate reducer
CN100441531C (zh) *	2003-11-21	2008-12-10	格雷斯公司	硫酸盐分散体铬酸盐还原剂
ATE329887T1 (de) *	2003-12-12	2006-07-15	Kehrmann Alexander	Hydraulisches bindemittel
CN100441533C (zh) *	2004-02-04	2008-12-10	格雷斯公司	一种减少水泥组合物中六价铬的方法
US7232483B2 (en)	2005-02-01	2007-06-19	W. R. Grace & Co.-Conn.	Cement composition having chromium reducer
WO2006132762A2 (en) *	2005-06-02	2006-12-14	W.R. Grace & Co.-Conn.	Biomass-derived grinding aids
CZ300050B6 (cs) *	2005-09-30	2009-01-21	Peringer@František	Zpusob úpravy manipulacních vlastností heptahydratovaného síranu železnatého, zejména snížení jeho hygroskopických vlastností
US7296626B2 (en)	2005-11-08	2007-11-20	Halliburton Energy Services, Inc.	Liquid additive for reducing water-soluble chromate
FR2894956A1 (fr) *	2005-12-20	2007-06-22	Lafarge Sa	Particules de sulfate de fer enrobees et leur utilisation dans la preparation de ciments
US20070237493A1 (en) *	2006-03-24	2007-10-11	I-Sho Limited	Providing user access to digital content data
PL1886979T3 (pl) *	2006-08-11	2013-02-28	Gcp Applied Tech Inc	Związki koordynacyjne metali do redukcji chromu
EP1992595A1 (en) *	2007-05-10	2008-11-19	Lafarge	Process to reduce the amount of Cr (VI) in a cement-containing composition and a composition comprising cement and coated metallic sulphate particles
DE102009002916A1 (de)	2009-05-07	2010-11-11	Mig Material Innovative Gesellschaft Mbh	Reduktionsverstärker für Zinn-II-Verbindungen
DE102009036848B4 (de)	2009-08-10	2012-02-02	Bauer Spezialtiefbau Gmbh	Verfahren zur Herstellung eines Bauwerkelementes im Boden sowie Bodenmörtel
EP2363386A1 (de)	2010-02-23	2011-09-07	Mig Material Innovative Gesellschaft MBH	Reduktion von Cr(VI)-Ionen in Zement oder zementhaltigen Produkten
DE102010009444A1 (de)	2010-02-23	2011-08-25	MIG Material Innovative Gesellschaft mbH, 33154	Zusammensetzung für die Reduktion von Cr(VI)-Ionen in Zement oder zementhaltigen Produkten
DE202010002838U1 (de)	2010-02-23	2010-05-12	Mig Material Innovative Gesellschaft Mbh	Zusammensetzung für die Reduktion von Cr(VI)-Ionen in Zement oder zementhaltigen Produkten
DE102011008967B4 (de) *	2011-01-12	2014-10-30	Khd Humboldt Wedag Gmbh	Anlage zur Herstellung von Zement mit zentraler Mahleinheit
KR101046557B1 (ko)	2011-03-15	2011-07-05	(유)코리아레미콘	음이온을 함유하는 용수를 이용한 친환경 레미콘 조성물
ITMI20120764A1 (it)	2012-05-07	2013-11-08	Mapei Spa	Additivo per cemento portland costituito da un riducente incapsulato in una matrice polimerica
CN104386506A (zh) *	2014-10-24	2015-03-04	广德县瑞龙新型材料有限公司	一种萤石储料计量装置
CN108274641A (zh) *	2018-01-22	2018-07-13	扬州扬工机械有限公司	一种新型商混站外加剂输送管路
CN113307528A (zh) *	2021-06-02	2021-08-27	龙蟒佰利联集团股份有限公司	一种水泥降铬剂及制备、使用方法

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US931884A (en) *	1908-09-14	1909-08-24	Meramec Portland Cement & Material Company	Waterproof portland cement and process of making same.
GB191021315A (en) *	1909-10-15	1910-10-27	Thorrand Durandy Et Cie Soc	Improvements in and relating to the Preparation of Cement.
US2316039A (en) *	1940-04-04	1943-04-06	Du Pont	Cement composition
US2307270A (en) *	1940-08-04	1943-01-05	Mellon Inst Of Ind Res	Building material
US3035985A (en) *	1959-09-30	1962-05-22	Merck & Co Inc	Chewable fatty coating of iron particles
CH427620A (de) *	1961-10-24	1966-12-31	Licencia Talalmanyokat	Verfahren zur Erhöhung der Endfestigkeit von zementhaltigen, hydraulisch bindenden Massen, insbesondere von Beton
GB970897A (en) *	1962-06-26	1964-09-23	Smidth & Co As F L	Improvements relating to grinding cement clinker and similar materials
AT260772B (de) *	1965-01-25	1968-03-25	Polysius Gmbh	Verfahren zur Herstellung thermisch stabiler und abriebfester Granalien aus unplastischem Zementrohmehl
US3425892A (en) *	1965-10-22	1969-02-04	Grace W R & Co	Cement set retarder
DE2042227B2 (de) *	1970-08-26	1978-03-30	Loesche Hartzerkleinerungs- Und Zementmaschinen Kg, 4000 Duesseldorf	Einrichtung für die automatische Proportionierung von Rohstoffkomponenten, insbesondere für die Zementproduktion
CH534643A (fr) *	1971-02-16	1973-03-15	Service Neuchatelois De Medeci	Procédé de fabrication d'un ciment
JPS4823479U (da) *	1971-07-26	1973-03-17
DE2221454A1 (de) *	1972-05-02	1973-11-15	Aloys Dr Wuestefeld	Verfahren zur verbesserung der verwendbarkeit von metallpulver als treibmittel in alkalischen medien durch schichtbildung auf der metalloberflaeche
JPS5144535A (en) *	1974-10-15	1976-04-16	Matsushita Electric Industrial Co Ltd	Maisetsukinzokutaiboshokusochi
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GB1581539A (en) *	1976-10-07	1980-12-17	Laporte Industries Ltd	Making plaster from ferrous sulphate
JPS53144872A (en) *	1977-05-25	1978-12-16	Takenaka Komuten Co	Solidification method* solidifying agent and additive aid for wastes
DE2817080C3 (de) *	1978-04-19	1985-04-04	Skw Trostberg Ag, 8223 Trostberg	Feste Zusatzmittel für mit Wasser erhärtende Bindemittel und deren Verwendung
US4415367A (en) *	1978-09-18	1983-11-15	The Dow Chemical Company	Pumpable thixotropic cement slurries for use in cementing pipes in a well

1981
- 1981-10-28 IS IS3024A patent/IS1443B6/is unknown
- 1981-12-15 DK DK557081A patent/DK147637C/da not_active IP Right Cessation
- 1981-12-16 US US06/617,835 patent/US4572739A/en not_active Expired - Lifetime
- 1981-12-16 FI FI822844A patent/FI822844A7/fi not_active Application Discontinuation
- 1981-12-16 JP JP57500213A patent/JPS57501961A/ja active Pending
- 1981-12-16 WO PCT/DK1981/000115 patent/WO1982002040A1/en not_active Ceased
- 1981-12-16 BR BR8108922A patent/BR8108922A/pt unknown
- 1981-12-16 AU AU79362/82A patent/AU545867B2/en not_active Expired
- 1981-12-16 ES ES508033A patent/ES8304046A1/es not_active Expired
- 1981-12-16 CA CA000392389A patent/CA1178976A/en not_active Expired
- 1981-12-16 FI FI845157A patent/FI845157L/fi not_active Application Discontinuation
- 1981-12-17 IE IE891754A patent/IE891754L/xx unknown
- 1981-12-17 DE DE19813176847 patent/DE3176847D1/de not_active Expired
- 1981-12-17 AT AT84115413T patent/ATE36512T1/de not_active IP Right Cessation
- 1981-12-17 IE IE1754/89A patent/IE54583B1/en not_active IP Right Cessation
- 1981-12-17 DD DD81235902A patent/DD201882A5/de not_active IP Right Cessation
- 1981-12-17 EP EP84115413A patent/EP0160746B1/en not_active Expired
- 1981-12-17 AT AT81110557T patent/ATE20731T1/de not_active IP Right Cessation
- 1981-12-17 IS IS2693A patent/IS1487B/is unknown
- 1981-12-17 EP EP84115414A patent/EP0160747A1/en not_active Withdrawn
- 1981-12-17 DE DE8181110557T patent/DE3174944D1/de not_active Expired
- 1981-12-17 IE IE2979/81A patent/IE54582B1/en not_active IP Right Cessation
- 1981-12-17 DE DE198181110557T patent/DE54314T1/de active Pending
- 1981-12-17 EP EP81110557A patent/EP0054314B1/en not_active Expired
- 1981-12-17 PL PL1981234277A patent/PL136035B1/pl unknown
1982
- 1982-08-13 NO NO822759A patent/NO163223C/no not_active IP Right Cessation
1987
- 1987-07-21 US US07/077,004 patent/US4784691A/en not_active Expired - Lifetime
1988
- 1988-04-27 FI FI881986A patent/FI97466C/fi not_active IP Right Cessation
- 1988-11-03 NO NO884903A patent/NO164769C/no not_active IP Right Cessation

Also Published As

Publication number	Publication date
NO884903D0 (no)	1988-11-03
DE3174944D1 (en)	1986-08-21
JPS57501961A (da)	1982-11-04
CA1178976A (en)	1984-12-04
ES508033A0 (es)	1983-02-16
FI822844A0 (fi)	1982-08-16
DE54314T1 (de)	1983-04-14
PL234277A1 (da)	1982-08-16
AU7936282A (en)	1982-07-01
US4572739A (en)	1986-02-25
IE54583B1 (en)	1989-12-06
FI881986A7 (fi)	1988-04-27
IS1487B (is)	1992-06-30
IE812979L (en)	1982-06-17
EP0160746B1 (en)	1988-08-17
AU545867B2 (en)	1985-08-01
ATE20731T1 (de)	1986-08-15
NO163223B (no)	1990-01-15
WO1982002040A1 (en)	1982-06-24
FI881986A0 (fi)	1988-04-27
NO163223C (no)	1998-06-09
DK147637C (da)	1985-05-13
EP0054314B1 (en)	1986-07-16
EP0160746A1 (en)	1985-11-13
EP0160747A1 (en)	1985-11-13
IE891754L (en)	1982-06-17
IS1443B6 (is)	1990-12-14
DE3176847D1 (da)	1988-09-22
NO884903L (no)	1982-08-13
FI97466C (fi)	1996-12-27
ES8304046A1 (es)	1983-02-16
FI845157A0 (fi)	1984-12-28
BR8108922A (pt)	1982-11-30
IE811754L (en)	1982-02-04
FI845157A7 (fi)	1984-12-28
ATE36512T1 (de)	1988-09-15
EP0054314A1 (en)	1982-06-23
NO822759L (no)	1982-08-13
IE54582B1 (en)	1989-12-06
NO164769B (no)	1990-08-06
DD201882A5 (de)	1983-08-17
PL136035B1 (en)	1986-01-31
FI822844L (fi)	1982-08-16
FI97466B (fi)	1996-09-13
IS3024A7 (is)	1982-06-18
DK147637B (da)	1984-10-29
FI845157L (fi)	1984-12-28
FI822844A7 (fi)	1982-08-16
IS2693A7 (is)	1982-06-18
NO164769C (no)	1998-06-09
US4784691A (en)	1988-11-15

Publication	Publication Date	Title
DK557081A (da)	1982-06-18	Fremgangsmaade og anlaeg til fremstilling af en toer cementblanding
ATE24838T1 (de)	1987-01-15	Lyophilisierte zusammensetzungen, ihre herstellung und verwendung.
DK440483A (da)	1983-09-26	Toer cementsammensaetning og fremgangsmaade til fremstilling deraf
DK256984A (da)	1984-05-24	Toer cementsammensaetning
AU563745B2 (en)	1987-07-23	Stable cementitious composition
JPS5352622A (en)	1978-05-13	Composition for preparation of bordeaux mixture
JPS5523110A (en)	1980-02-19	Grout and grouting method
JPS51117727A (en)	1976-10-16	Liquid coating composition for providing glossy, surface coating
JPS57165A (en)	1982-01-05	Polyphenylene sulfide composition
JPS5697510A (en)	1981-08-06	Coagulant composition and preparation thereof
JPS5656298A (en)	1981-05-18	Preparation of mini pellet
JPS5543037A (en)	1980-03-26	Concentrated lime sulfur mixture
ES318873A1 (es)	1967-03-01	El metodo de preparar una mezcla seca adecuada para ser utilizada como sustituto del cemento portland
JPS5313639A (en)	1978-02-07	Preparation of slurry coating compositions
JPS5686105A (en)	1981-07-13	Pesticide powder
JPS52145094A (en)	1977-12-02	Preparation of gas-sensitive elenment
KR870006502A (ko)	1987-07-11	미술교재용 즉석형 섬유분말제 대용찰흙의 제조방법
JPS51126318A (en)	1976-11-04	Pitting resistant fe -basealloy
GB1206737A (en)	1970-09-30	Improvements in or relating to processing water containing slags suitable for us in cement manufacture and other purposes and novel cement composition
JPS5641828A (en)	1981-04-18	Manufacture of coarse gypsum
JPS51127127A (en)	1976-11-05	Method of mixing resin materials for the manufacture of powder coating compositions
JPS52145095A (en)	1977-12-02	Preparation of gas-sensitive element
GB766374A (en)	1957-01-23	Process for the preparation of an admixed material containing saponified natural resin for use in mortar compositions and other building materials
ES276788A3 (es)	1962-07-01	Mejoras en el procedimiento empleado para recubrir superficies en la edificación
JPS5544309A (en)	1980-03-28	Sludge treating method

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