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
  • C04B7/00—Hydraulic cements
  • C04B7/02—Portland cement

Definitions

• the invention relates to a Portland cement clinker, its use and a Portland cement.
• Portland cement usually consists of Portland cement clinker and a sulfate carrier, usually gypsum.
• Portland cement clinker is made from a mixture of raw materials that is mainly calcium oxide (CaO)
• the cement which has been mixed and hardened with water, owes its strength primarily to the C 2 S clinker phase.
• Clinker is made by adding an F - containing compound
• Thermal energy is also required to grind the clinker electrical energy.
• the invention has for its object a
• Portland cement clinker with a C 3 S content between 40 and 80 wt .-% can be produced and can be fired at low temperatures of 1250 to 1350 ° if the
• the SO 3 content in the clinker should be between> 1.0 and ⁇ 3.0% by weight.
• additive eg CaF 2 or ZnO
• a lower firing temperature reduces the energy consumption in clinker production.
• the clinker may have higher values of free lime than clinker fired at higher temperatures, but even contents of up to 5.0% by weight of CaO do not lead to signs of driving when setting or to a loss of strength in a clinker (cement) according to the invention.
• This is obviously related to the increased reactivity of the CaO formed at low temperatures, which reacts to Ca (OH) 2 before the solidification process and is therefore harmless.
• Part of the calcium oxide required for clinker phase formation is introduced instead of calcium carbonate through the sulfate carrier, for example anhydrite (CaSO 4 ), which further reduces the energy requirement with the same lime standard.
• the total SO 3 content of the cement should be between 2 and 4% by weight.
• a cement clinker is preferred which has the following clinker phase components in% by weight:
• a preferred SO 3 content in the clinker can be given as 1.5 to 2.5% by weight, based on the clinker.
• the required SO 3 -containing component is preferably introduced in the form of a calcium sulfate carrier.
• a calcium sulfate carrier This can consist of gypsum or anhydrite.
• industrial residues containing sulfite and / or sulfate use such as an ash from a fluidized bed combustion and / or a stabilizer from the flue gas desulfurization.
• Adding a sulfite-containing product results in further fuel savings because the oxidation of sulfite to sulfate is an exothermic process.
• the corresponding calcium sulfate carrier can also be used to produce the finished Portland cement from the
• an advantageous embodiment proposes that the kinker be applied to a specific surface area of 2500 to 4000 cm 2 / g (according to Blaine)
• Firing temperature which leads to the highly porous clinker described.
• the improved grindability leads to energy savings when grinding, which can be up to 50%.
• harmful emissions for example CO 2 and NO ⁇ emissions, are reduced by lower firing temperatures.
• Industrial residues containing sulfur such as fluidized bed ash, can also be processed as part of the raw meal.
• Sample 1 describes a sulfobelitic cement which is C 3 S-free but has a proportion of 20% by weight
• Sample 2 describes a cement according to the invention which is free on
• Sample 3 relates to a cement according to DE 42 04 227 Cl.
• the proportions of the clinker phases, the SO 3 content in the clinker, the selected firing temperature and the total SO 3 content of the cement are given in the table below, as are the compressive strength values after 1, 3, 7, 28 and 365 days.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)
• Cosmetics (AREA)

Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

Country Status (11)

Families Citing this family (14)

Family Cites Families (4)

• 1994
  • 1994-11-23 DE DE4441614A patent/DE4441614C1/de not_active Expired - Fee Related
• 1995
  • 1995-11-17 EP EP95936947A patent/EP0793625A1/de not_active Withdrawn
  • 1995-11-17 CN CN95197415A patent/CN1173165A/zh active Pending
  • 1995-11-17 CA CA002205839A patent/CA2205839A1/en not_active Abandoned
  • 1995-11-17 US US08/849,641 patent/US5851282A/en not_active Expired - Fee Related
  • 1995-11-17 PL PL95320346A patent/PL320346A1/xx unknown
  • 1995-11-17 WO PCT/DE1995/001621 patent/WO1996015996A1/de not_active Application Discontinuation
  • 1995-11-17 CZ CZ971519A patent/CZ151997A3/cs unknown
  • 1995-11-17 AU AU39223/95A patent/AU3922395A/en not_active Abandoned
  • 1995-11-17 HU HU9701803A patent/HUT77272A/hu unknown
  • 1995-11-17 JP JP8516446A patent/JPH10512841A/ja active Pending

Non-Patent Citations (1)

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