GB958607A - Production of siliceous pigments - Google Patents

Production of siliceous pigments

Info

Publication number
GB958607A
GB958607A GB4321361A GB4321361A GB958607A GB 958607 A GB958607 A GB 958607A GB 4321361 A GB4321361 A GB 4321361A GB 4321361 A GB4321361 A GB 4321361A GB 958607 A GB958607 A GB 958607A
Authority
GB
United Kingdom
Prior art keywords
solution
siliceous
water
conduit
alkali metal
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.)
Expired
Application number
GB4321361A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PPG Industries Inc
Original Assignee
Pittsburgh Plate Glass Co
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 Pittsburgh Plate Glass Co filed Critical Pittsburgh Plate Glass Co
Publication of GB958607A publication Critical patent/GB958607A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Dispersion Chemistry (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Composite Materials (AREA)
  • Silicon Compounds (AREA)
  • Paper (AREA)

Abstract

Finely divided siliceous pigments are produced by a method which comprises diluting an aqueous alkali metal silicate solution containing at least 30 grams alkali metal oxide per litre with water to provide a solution having less than 15 grams alkali metal oxide per litre, <PICT:0958607/C1/1> promptly thereafter partially neutralizing the diluted solution to form an aqueous siliceous solution having a tendency to form silicate precipitate and mixing water soluble salt with the partially neutralized siliceous solution before water insoluble siliceous material appears therein whereby to precipitate siliceous pigment. In an example, water at 45 DEG C. is forwarded through conduit 1 past Venturi 2 which causes sodium silicate solution also at 45 DEG C. to be inspirated and promptly diluted with water. The resulting solution is discharged into mixing block 3. Simulataneously, water is forwarded in conduit 4 past Venturi 5 which inspirates hydrochloric acid and dilutes it and passes it into mixing block 3. The jets are so arranged that they discharge the liquids tangentially and spaced 180 degrees from one another. The streams are thereby mixed and the partially neutralized solution is discharged through conduit 7 into tank 8. Tank 8 con tains an aqueous solution of calcium chloride and sodium chloride to precipitate siliceous material which is removed as a slurry by conduit 13 to be washed, filtered and dried. To prevent sodium silicate passing through unprecipitated, a baffle (not shown) is disposed in the tank. The pigments produced have the following composition (parts by weight). .SiO2.79.5 .CaO.7.2 .Fe2O3.0.10 .*R2O3.0.47 .NaCl.0.76 .* Mainly Al2O3 and .Fe2O3 Specification 942,263 is referred to.ALSO:<PICT:0958607/C3/1> Fine-divided siliceous pigments are produced by a method which comprises diluting an aqueous alkali metal silicate solution containing at least 30 grams alkali metal oxide per litre with water to provide a solution having less than 15 grams alkali metal oxide per litre, promptly thereafter partially neutralizing the diluted solution to form an aqueous siliceous solution having a tendency to form silicate precipitate and mixing water soluble metal salt with the partially neutralized siliceous solution before water insoluble siliceous material appears therein whereby to precipitate siliceous pigment. In an example, water at 45 DEG C. is forwarded through conduit 1 past Venturi 2, which causes sodium silicate solution also at 45 DEG C. to be inspirated and promptly diluted with water. The resulting solution is discharged into mixing block 3. Simultaneously, water is forwarded in conduit 4 past Venturi 5, which inspirates hydrochloric acid and dilutes it and passes it into mixing block 3. The jets are so arranged that they discharge the liquids tangentially and spaced 180 degrees from one another. The streams are thereby mixed and the partially neutralized solution is discharged through conduit 7 into tank 8. Tank 8 contains an aqueous solution of calcium chloride and sodium chloride to precipitate siliceous material which is removed as a slurry by conduit 13 to be washed, filtered and dried. To prevent sodium silicate passing through unprecipitated, a baffle (not shown) is disposed in the tank. The pigments produced have the following composition (parts by weight): .SiO2.79.5 .CaO.7.2 .Fe2O3.0.10 .*R2O3.0.47 .NaCl.0.76 *Mainly Al2O3 and Fe2O3 Specification 942,263 is referred to.ALSO:Aqueous pulp slurry containing 2% pulp by weight is beaten to 400 millilitres freeness (Canadian standard) and is mixed with 10% of a silica pigment (based on pulp content) which has been made by diluting an alkali metal silicate solution from a concentration of more than 30 gms. metal oxide per litre to less than 15 gms./litre, partially neutralising this diluted solution and precipitating silica by mixing with water soluble salt (see Division C4). Sufficient aluminium sulphate is added to adjust the slurry to pH5. The pulp is then sheeted. The product has improved opacity and brightness. Specification 942,263 is referred to.
GB4321361A 1960-12-05 1961-12-04 Production of siliceous pigments Expired GB958607A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7380760A 1960-12-05 1960-12-05

Publications (1)

Publication Number Publication Date
GB958607A true GB958607A (en) 1964-05-21

Family

ID=22115910

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4321361A Expired GB958607A (en) 1960-12-05 1961-12-04 Production of siliceous pigments

Country Status (4)

Country Link
BE (1) BE610800A (en)
DE (1) DE1283207B (en)
GB (1) GB958607A (en)
NL (1) NL271669A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2910459A1 (en) * 2006-12-22 2008-06-27 Rhodia Recherches & Tech NEW PROCESS FOR THE PREPARATION OF PRECIPITED SILICES BY IMPLEMENTING A RAPID MIXER

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1037673C (en) * 1994-05-27 1998-03-11 梁儒诚 Process for white fume

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2910459A1 (en) * 2006-12-22 2008-06-27 Rhodia Recherches & Tech NEW PROCESS FOR THE PREPARATION OF PRECIPITED SILICES BY IMPLEMENTING A RAPID MIXER

Also Published As

Publication number Publication date
DE1283207B (en) 1968-11-21
BE610800A (en) 1962-03-16
NL271669A (en)

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