WO1981001000A1 - Procede de production de moulages de silicate de calcium - Google Patents

Procede de production de moulages de silicate de calcium Download PDF

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Publication number
WO1981001000A1
WO1981001000A1 PCT/JP1979/000260 JP7900260W WO8101000A1 WO 1981001000 A1 WO1981001000 A1 WO 1981001000A1 JP 7900260 W JP7900260 W JP 7900260W WO 8101000 A1 WO8101000 A1 WO 8101000A1
Authority
WO
WIPO (PCT)
Prior art keywords
calcium silicate
raw material
water
hydrate
aqueous slurry
Prior art date
Application number
PCT/JP1979/000260
Other languages
English (en)
Japanese (ja)
Inventor
Y Oguri
M Abe
S Inoue
J Saito
T Kawahara
Original Assignee
Mitsubishi Chem Ind
Y Oguri
M Abe
S Inoue
J Saito
T Kawahara
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 Mitsubishi Chem Ind, Y Oguri, M Abe, S Inoue, J Saito, T Kawahara filed Critical Mitsubishi Chem Ind
Priority to PCT/JP1979/000260 priority Critical patent/WO1981001000A1/fr
Priority to NL7920096A priority patent/NL7920096A/nl
Publication of WO1981001000A1 publication Critical patent/WO1981001000A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/20—Silicates
    • C01B33/24—Alkaline-earth metal silicates
    • 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
    • C04B28/18—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 mixtures of the silica-lime type
    • 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
    • Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

Definitions

  • the present invention relates to a method for producing a calcium silicate molded body. More specifically, the present invention relates to a method for producing a calcium silicate molded body having low bulk density, excellent heat resistance, excellent mechanical strength and dimensional stability, and thus suitable as a heat insulating material and a heat insulating material. You.
  • Calcium silicate molded products are suitable as heat insulating materials and heat insulating materials because they have heat resistance of / c or more. is there.
  • a calcium silicate molded body used for a heat insulating material and a heat insulating material is required to have low thermal conductivity. For this purpose, it is necessary to produce a compact having a low bulk density, but it is extremely difficult to produce such a compact.
  • the gist of the present invention is that a sedimentary volume obtained by reacting a calcareous raw material and a siliceous raw material dispersed in water with heating is obtained.
  • the calcareous raw material is predicted to be at least twice the weight of the calcareous raw material.
  • the calcareous raw material is previously stirred and dispersed in water at a temperature of at least / q weight and at a temperature of ⁇ / 00 C with respect to the calcareous raw material for a time satisfying the above formula (I). It is necessary. Particularly preferred is / ⁇ ⁇ weight times and calci ... Equation ( ⁇ ) in water at a temperature of J "C
  • any of the well-known ones such as quicklime, slaked lime and carbite slag can be used, but quicklime is particularly preferred.
  • the slurry containing the calcareous raw material is used.
  • the seed and the siliceous raw material are mixed and reacted under heating.
  • the siliceous raw materials include natural products such as diatomaceous earth and silica stone or silicon dust, and hydrosilicofluoric acid and aluminum hydroxide by-produced in the wet phosphoric acid production process. And other industrial by-products such as silica (hereinafter simply referred to as wet phosphoric acid by-product silica).
  • the mixing molar ratio of the siliceous raw material and calcareous raw material (Cao / Siog) is when zonotrite is desired as crystals of silicate hydrate in the final molded product. Is usually within the range of cf ⁇ /].?, But it is usually used when crystalline tongues and molytes are desired. There is a range of 0 to 7 ⁇
  • the amount of water for dispersing the two protozoa should be not less than / weight times the solid content of the raw material, and is particularly preferable to be in the range of / 7 to weight times.o Of course, i If the water in the slurry containing the calcareous raw material is not enough to make it work, more water may be added.
  • An aqueous slurry containing calcium silicate hydrate can be obtained by heating and reacting the two raw materials dispersed in water.
  • an aqueous slurry is prepared.
  • the sedimentation volume of calcium sulfate hydrate in the reactor must be at least / scA / 9.
  • the sedimentation volume is a value calculated by the following equation (I).
  • w is the total weight of the solid content of the raw material (for example, quicklime + siliceous raw material) (If a calcareous raw material other than quicklime is used, convert it to quicklime to obtain the total weight.)
  • V is the volume occupied by the solids that settled after allowing the slurry obtained after the reaction to stand for 2 hours. In practice, this is usually determined as follows. First, a slurry of the total weight obtained after the reaction was collected in a mess cylinder and allowed to stand for 2 hours, and the volume ed occupied by the sedimented solids was measured. Next formula (IV)! )calculate.
  • Settling volume W represents the total weight of the raw materials in the same manner as in formula (i).
  • the reaction system needs to be kept in a liquid state, and thus the reaction is performed under pressure.
  • the calcium silicate hydrate in the aqueous slurry must be a compound of tobermorite glue ⁇
  • a variety of calcium silicate hydrates are known. J9, generally by HFW Taylor, “The Chemistry One-Year-Old Bussem f ⁇ Chemi B t ry of Cements) "Volume / Volume / Sorted according to the classification shown in the table on page 2 c.
  • Toba moriite gel compounds include toba moriite gel, C_s- H ( ⁇ ) ⁇ C — S — ⁇ (I) and crystalline tobermorite, but any of them may be used.
  • Calcium silicate hydrate is composed of topamolite glue — C — S — ⁇ ( ⁇ ) ⁇ C _ s- ⁇ (I) ⁇ / / ⁇ tobamolite (crystalline Since the transition usually takes place in the order of (topamorite) ⁇ zonotrite, it is sufficient to adjust the reaction temperature and time to obtain the desired hydrate. That is, when the reaction temperature is increased or the reaction time is increased, the hydrate is shifted in the direction of the arrow (-). When the reaction is carried out in a temperature range for achieving the second condition, a compound of the tobamolite group is usually obtained. However, if the reaction temperature is particularly high, the reaction time is particularly long, so zonotrite can be obtained.
  • the temperature may be lowered or the reaction time may be shortened.
  • calcium silicate hydrate in slurry is tobermorite gel, C— Must be S — H (I) or C – S — H ( ⁇ ).
  • the calcium silicate hydrate in the aqueous slurry satisfies both the first and second conditions described above.
  • the obtained aqueous slurry is subjected to pressure dehydration molding after adding reinforcing fibers according to a conventional method.
  • the reinforcing fibers may be added before the production of the aqueous slurry.
  • Any of various well-known reinforcing fibers can be used. For example, asbestos, rock wool, glass fibers, and the like are used. Usually, it is added so that ⁇ . ⁇ / ⁇ Weight is contained in the final molded article.
  • Hydrate is a tobamorite gel, 0 — S — H (I) or C — S — H
  • the hydrate can be transferred to crystalline tobamorite or zonotorite, and in the case of crystalline tobamorite, the hydrate can be transferred to zonotorite. is necessary.
  • the crystallization by the steam curing a compact having a low bulk density and excellent mechanical strength can be obtained.
  • the higher the water vapor pressure the shorter the reaction time, but it is usually in the range of ⁇ 0 ⁇ / cA Qr.
  • zonotrite is desired as the crystal of the final molded product, « « 2 ⁇ 1 ⁇ / CT? G ”, crystalline tobermorite
  • ⁇ S kg./c Qr steam is preferred.
  • the above-mentioned transition is usually easily performed. Such cases are very rare if the transition is not performed as desired, but if, for example, zonotriite is desired and crystalline topomolite is obtained. Should the steam pressure be increased or the steam curing time extended, or should zonotrite be obtained when crystalline topomolite is desired, or vice versa? What is necessary is just to shorten the time of steam curing.
  • the amount of quicklime (CaOO) shown in Table / Table was added to the amount of water shown in Table / Table and stirred under the conditions shown in Table / Table to produce a slurry containing calcareous raw material. After adding the siliceous raw material in the amount shown in Table / Table to this slurry, water was added so that the total amount of water became c2 J "weight times the solid content. The siliceous raw material was used.
  • implementation Te examples / and Comparative examples / through equation phosphate byproduct Shi Li force dampening in 2 (composition S i0 2? 7. ⁇ f, ⁇ 2 0 3 0,, loss on ignition /.
  • the method of the present invention is particularly useful as a method for producing a calcium silicate molded body suitable as a heat insulating material and a heat insulating material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Des moulages de silicate de calcium de faible densite, de grande resistance thermique, et presentant une excellente resistance mecanique sont produits par dispersion preliminaire de chaux dans de l'eau dans des conditions specifiques, addition d'un materiau d'acide silicique, chauffage du melange pour provoquer une reaction et obtenir une boue aqueuse contenant un hydrate de silicate de calcium et ayant des proprietes specifiques, puis deshydratation et moulage de cette boue aqueuse qui est soumise a une polymerisation a la vapeur sous pression pour cristalliser l'hydrate de silicate de calcium.
PCT/JP1979/000260 1979-10-12 1979-10-12 Procede de production de moulages de silicate de calcium WO1981001000A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP1979/000260 WO1981001000A1 (fr) 1979-10-12 1979-10-12 Procede de production de moulages de silicate de calcium
NL7920096A NL7920096A (nl) 1979-10-12 1979-10-12 Werkwijze voor het vervaardigen van een produkt uit calciumsilicaat.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
WOJP79/00260 1979-10-12
PCT/JP1979/000260 WO1981001000A1 (fr) 1979-10-12 1979-10-12 Procede de production de moulages de silicate de calcium

Publications (1)

Publication Number Publication Date
WO1981001000A1 true WO1981001000A1 (fr) 1981-04-16

Family

ID=13677716

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1979/000260 WO1981001000A1 (fr) 1979-10-12 1979-10-12 Procede de production de moulages de silicate de calcium

Country Status (2)

Country Link
NL (1) NL7920096A (fr)
WO (1) WO1981001000A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5445334A (en) * 1977-08-12 1979-04-10 Osaka Patsukingu Seizoushiyo K Method of making super light calicium silicate formed body
JPS5476625A (en) * 1977-11-30 1979-06-19 Mitsubishi Chem Ind Calcium silicate formed body and method of making same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5445334A (en) * 1977-08-12 1979-04-10 Osaka Patsukingu Seizoushiyo K Method of making super light calicium silicate formed body
JPS5476625A (en) * 1977-11-30 1979-06-19 Mitsubishi Chem Ind Calcium silicate formed body and method of making same

Also Published As

Publication number Publication date
NL7920096A (nl) 1981-08-03

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