WO2009004219A3 - Additive for reducing hexavalent chromium, method for obtaining same and applications of said additive particularly in cement-based products - Google Patents

Additive for reducing hexavalent chromium, method for obtaining same and applications of said additive particularly in cement-based products Download PDF

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Publication number
WO2009004219A3
WO2009004219A3 PCT/FR2008/051048 FR2008051048W WO2009004219A3 WO 2009004219 A3 WO2009004219 A3 WO 2009004219A3 FR 2008051048 W FR2008051048 W FR 2008051048W WO 2009004219 A3 WO2009004219 A3 WO 2009004219A3
Authority
WO
WIPO (PCT)
Prior art keywords
additive
cement
hexavalent chromium
applications
based products
Prior art date
Application number
PCT/FR2008/051048
Other languages
French (fr)
Other versions
WO2009004219A2 (en
Inventor
Gerard Lang
Original Assignee
Gerard Lang
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.)
Filing date
Publication date
Application filed by Gerard Lang filed Critical Gerard Lang
Priority to EP08805983A priority Critical patent/EP2162407A2/en
Publication of WO2009004219A2 publication Critical patent/WO2009004219A2/en
Publication of WO2009004219A3 publication Critical patent/WO2009004219A3/en

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
    • 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
    • C04B40/0039—Premixtures of ingredients
    • 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, 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/52—Grinding aids; Additives added during grinding
    • 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)
  • Removal Of Specific Substances (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention relates to an additive for reducing hexavalent chromium in products such as, in particular, cement, slag or gypsum, that comprises a stabilised aqueous solution of a chromium reducing agent, containing: water; a chromium reducing agent such as heptahydrated ferrous sulphate; an acid; an oxygen reducing agent dissolved in excess in water. The solution may have a pH from 4 to 6. In order to improve the grinding, the additive may further include ethanolamine. The additive can be sprayed on cement during grinding, or added in a concrete mixer.
PCT/FR2008/051048 2007-06-12 2008-06-12 Additive for reducing hexavalent chromium, method for obtaining same and applications of said additive particularly in cement-based products WO2009004219A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08805983A EP2162407A2 (en) 2007-06-12 2008-06-12 Additive for reducing hexavalent chromium, method for obtaining same and applications of said additive particularly in cement-based products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0704153 2007-06-12
FR0704153A FR2917401B1 (en) 2007-06-12 2007-06-12 CHROMIUM HEXAVALENT REDUCING ADDITIVE, PROCESS FOR OBTAINING THE SAME, AND APPLICATIONS THEREOF, IN PARTICULAR CEMENT PRODUCTS.

Publications (2)

Publication Number Publication Date
WO2009004219A2 WO2009004219A2 (en) 2009-01-08
WO2009004219A3 true WO2009004219A3 (en) 2009-02-12

Family

ID=39288097

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2008/051048 WO2009004219A2 (en) 2007-06-12 2008-06-12 Additive for reducing hexavalent chromium, method for obtaining same and applications of said additive particularly in cement-based products

Country Status (3)

Country Link
EP (1) EP2162407A2 (en)
FR (1) FR2917401B1 (en)
WO (1) WO2009004219A2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2953511B1 (en) * 2009-12-04 2011-11-18 Lafarge Sa PROTECTING A DISPERSANT DURING A GRINDING
US8629202B2 (en) * 2009-08-05 2014-01-14 Lafarge Protection of a dispersing agent during a grinding operation
CN102189093B (en) * 2010-03-09 2015-02-04 刘杰 Method for detoxicating chromium residues and comprehensive utilization of detoxicated chromium residues
CN104496251B (en) * 2014-11-25 2017-03-22 中国建筑材料科学研究总院 Liquid hexavalent chromium reducing agent and preparation method thereof, cement and preparation method thereof
RU2675016C1 (en) * 2017-08-29 2018-12-14 Акционерное общество "Калужский научно-исследовательский институт телемеханических устройств" Method for recovery of chromium (+6) in liquid waste of electroplating industry
CN109652034A (en) * 2018-12-18 2019-04-19 中国石油集团川庆钻探工程有限公司 Method for maintaining pH value of water-based drilling fluid under high-temperature and high-salt-content conditions
CN113480219A (en) * 2021-07-15 2021-10-08 内蒙古宏尔高新材料科技有限公司 Chromium reducing agent for reducing water-soluble chromium (VI) in cement and preparation method thereof
CN115043611B (en) * 2021-09-16 2023-09-05 安徽成弘建新材料有限公司 Neutral high-temperature-resistant liquid cement hexavalent chromium reducing agent and preparation method thereof
CN113912317B (en) * 2021-11-12 2022-10-25 哈尔滨三发新型节能建材有限责任公司 Cement production method by adding naphthalene sulfonate water reducing agent

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1505045A1 (en) * 2003-08-01 2005-02-09 Dr. Paul Lohmann GmbH KG Admixture for the reduction of hexavalent chromium in cement compositions and method for preparing said admixture
WO2005037728A1 (en) * 2003-10-07 2005-04-28 W. R. Grace & Co.-Conn Amine-based, hexavalent chronmium reducing agents for cement
EP1533287A1 (en) * 2003-11-21 2005-05-25 W.R. Grace & Co.-Conn. Dispersion comprising tin sulfate or ferrous sulfate for reducing chromate in cement
WO2005076858A2 (en) * 2004-02-04 2005-08-25 W.R. Grace & Co.-Conn. Liquid additive for intergrinding cement
EP1661871A1 (en) * 2004-11-25 2006-05-31 Mapei S.p.A. Additive for the manufacture of cement free of soluble chromates

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1505045A1 (en) * 2003-08-01 2005-02-09 Dr. Paul Lohmann GmbH KG Admixture for the reduction of hexavalent chromium in cement compositions and method for preparing said admixture
WO2005037728A1 (en) * 2003-10-07 2005-04-28 W. R. Grace & Co.-Conn Amine-based, hexavalent chronmium reducing agents for cement
EP1533287A1 (en) * 2003-11-21 2005-05-25 W.R. Grace & Co.-Conn. Dispersion comprising tin sulfate or ferrous sulfate for reducing chromate in cement
WO2005076858A2 (en) * 2004-02-04 2005-08-25 W.R. Grace & Co.-Conn. Liquid additive for intergrinding cement
EP1661871A1 (en) * 2004-11-25 2006-05-31 Mapei S.p.A. Additive for the manufacture of cement free of soluble chromates

Also Published As

Publication number Publication date
WO2009004219A2 (en) 2009-01-08
FR2917401A1 (en) 2008-12-19
EP2162407A2 (en) 2010-03-17
FR2917401B1 (en) 2010-08-13

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