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WO1997001613A1 - Procede pour empecher l'emission de poussieres par l'argile expansee - Google Patents

Procede pour empecher l'emission de poussieres par l'argile expansee Download PDF

Info

Publication number
WO1997001613A1
WO1997001613A1 PCT/FI1996/000368 FI9600368W WO9701613A1 WO 1997001613 A1 WO1997001613 A1 WO 1997001613A1 FI 9600368 W FI9600368 W FI 9600368W WO 9701613 A1 WO9701613 A1 WO 9701613A1
Authority
WO
WIPO (PCT)
Prior art keywords
alkali metal
metal salt
particles
expanded clay
approx
Prior art date
Application number
PCT/FI1996/000368
Other languages
English (en)
Inventor
Eero Aitta
Simo Salanne
Hillevi Oikarinen
Original Assignee
Kemira Chemicals Oy
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
Priority claimed from FI953165A external-priority patent/FI953165A0/fi
Application filed by Kemira Chemicals Oy filed Critical Kemira Chemicals Oy
Publication of WO1997001613A1 publication Critical patent/WO1997001613A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
    • C09K3/185—Thawing materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/22—Materials not provided for elsewhere for dust-laying or dust-absorbing

Definitions

  • the invention relates to a method for inhibiting dust emissions from expanded clay made up of porous pellets.
  • An additional object of the invention is an expanded clay which emits less dust than previously, produced in accordance with the method.
  • expanded clay porous clay pellets which have been fired in order to entrain air inside them.
  • An expanded clay pellet is hard but breaks easily.
  • Expanded clay is made from plastic clay. After preliminary working the clay is fired in a rotary kiln at a temperature of approx. 1150 °C. During the firing the clay expands and is molded into sintered rotating pellets under the rotary motion. The pellets are porous and full of small air voids.
  • the particle size of expanded clay is typically approx. 3-7 mm, and it is capable of adsorbing water at a rate of approx. 10 % of its volume in 10 minutes. Owing to its light weight and good thermal insulation capacity, expanded clay is used as an insulation material in buildings.
  • expanded clay can be used for manufacturing lightweight concrete, from which various building elements such as blocs are manufactured.
  • expanded clay also in crushed form, which is prepared by crushing from oversized pellets separated in the screening of expanded clay pellets.
  • the particle size in crushed expanded clay is approx. 4-8 mm.
  • the ex ⁇ panded clay it is possible to produce on the surface of expanded clay a surface layer by immersing the ex ⁇ panded clay in a solution which contains a water-soluble alkali metal salt or earth alkali metal salt and by drying the ex ⁇ panded clay.
  • the period during which the expanded clay par ⁇ ticles are in contact with the solution may be 5-60 seconds, preferably 10-20 seconds.
  • the aqueous solution of an alkali or earth alkali metal salt can be introduced onto the expanded clay particles by spraying or atomizing.
  • the con ⁇ centration of salt in the solution may be within a range of 5- 30 % by weight, preferably 10-20 % by weight.
  • the said water-soluble alkali or earth alkali metal salt may be a carboxylic acid salt, such as sodium formate (HCOONa) or potassium formate (HCOOK).
  • the water-soluble compound may also be a silicate, such as sodium silicate (Na 2 Si 3 0 7 , waterglass) or a silicofluoride, such as magnesium silicofluoride (MgSiFg).
  • the concentration of the sodium formate solution may vary with ⁇ in the range 5-30 %; however, the preferred concentration of the solution is within the range 10-20 %.
  • the drying tempera- ture is preferably above 100 %.
  • the concentra ⁇ tion of the solution may vary within the range 5-30 %; a pre ⁇ ferred concentration of the solution is 10-20 %.
  • the drying temperature is above 100 °C.
  • the concentration of a magnesium silicofluoride solution may vary within the range 5-30 %, pre ⁇ ferably within the range 10-25 %.
  • the drying temperature is 40- 100 °C, preferably 40-60 °C.
  • Sodium silicate suppresses dust emissions by as much as 70 % when suitably added.
  • Economy is in the same order as that of sodium formate.
  • the usability of sodium silicate is better than that of sodium formate.
  • Magnesium silicofluoride which is formed as a byproduct in the preparation of phosphoric acid, is even more effective than the former, with a sufficient batching of the chemical. Its usabil ⁇ ity may, however, be limited by the possibility of formation of toxic gases (silicofluoride) and potential corrosion problems.
  • An expanded clay according to the invention, treated with a solution which contains an alkali or earth alkali metal salt, is in particular characterized in that the expanded clay par ⁇ ticles of fired clay have, introduced onto their surface, a water-soluble alkali metal salt or earth alkali metal salt in an amount of approx. 0.5-6.0 %, preferably approx. 1.0-4.0 %, and most preferably approx. 2.0-4.0 %, of the weight of the particles.
  • the salt may be partially adsorbed into the par ⁇ ticles, while leaving particles at least partially porous.
  • the performance of the invention was tested by carrying out tests, which are described in greater detail below. In the tests the expanded clay was on the one hand in crushed form and on the other hand in pellet form. The results of the tests are compiled in Tables 1 and 2.
  • Example 2 The procedure was in other respects the same as in Example 1, but now the sieve-dried and weighed, approx. 100 g sample, to ⁇ gether with the sieve, was immersed into a 5 % sodium formate solution for approx. 15 seconds, whereby the crushed material was thoroughly moistened. Thereafter any excess solution was allowed to run off. The sample was dried at 105 °C and was thereafter weighed (100.7 g) . The sample was then transferred to a 10-liter drum, which was rotated for 15 minutes. The sample was poured onto a sieve, and any fine dust was screened off. Thereafter the sample was weighed, and the dust amount was calculated; it was 5.1 % of the original mass of the dried material. The sample was returned to the drum, which was rotat ⁇ ed for another 15 minutes. Thereafter the sample was screened and weighed. The result obtained was that now in total 10.2 % of the mass had turned into dust.
  • Dust emission tests were carried out by using a larger batch of expanded clay.
  • a batch of 2.370 kg was weighed of an expanded clay from which any loose dust had been screened off by using a Sweco sieve.
  • the pellets were placed in a concrete mixer, which was rotated for 10 minute ⁇ . Any loose dust was screened off from the pellets, and the pellets were weighed, whereupon the result obtained was that the mass had been reduced by 6.1 %. Thereafter, rotation in the concrete mixer was continued for 5 min (in total 15 min), whereafter the pellets were screened and weighed. The result obtained was that after 15 minutes of rotation the mass of the pellets had been reduced by 9.0 %. Thereafter, rotation was continued for a further 15 min (total period 30 min), whereupon, upon weighing, the mass of the pellets had been reduced by a total of 17 %.
  • Example 14 The procedure was otherwise the same as in Example 14, but now the weighed amount of pellets was poured into a bucket contain ⁇ ing a 15 % solution of sodium formate. Thereafter the moistened expanded clay was poured onto a sieve to drain and was dried at 105 °C. After the drying, the pellets were weighed and placed in a concrete mixer, in which they were rotated for 10 min, thereafter for 5 min, and finally for 15 min. After rotation, screening and weighing were carried out. The result obtained was that after 10 minutes the mass had been reduced by 3.2 %, after 15 minutes by 5.6 %, and after 30 minutes by 12.0 %. The results are shown in Table 2.
  • Example 18 The procedure was in other respects the same as in Example 15, but a 15 % sodium silicate solution was used, and the drying was carried out at 300 °C. The results are shown in Table 2.
  • Example 18 The procedure was in other respects the same as in Example 15, but a 15 % sodium silicate solution was used, and the drying was carried out at 300 °C. The results are shown in Table 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)

Abstract

Cette invention concerne un procédé pour supprimer l'émission de poussière par une argile expansée constituée de particules poreuses, ainsi qu'une argile expansée produite selon ce procédé. Essentiellement, ce procédé consiste à traiter la surface des particules d'argile expansée avec une solution contenant un sel métallique alcalin ou un sel métallique alcalino-terreux, puis on sèche les particules. On peut effectuer ce traitement soit en immergeant les particules dans la solution, soit en vaporisant celle-ci sur les particules. Les sels convenant à cet usage sont les formiates de de sodium et de potassium et le silicate de sodium. Dans l'argile expansée conforme à l'invention, la quantité de sel métallique alcalin ou de sel métallique alcalino-terreux introduite à la surface des particules est approximativement comprise entre 0,5 et 6 %, idéalement entre 2,0 et 4,0 %, en poids de l'argile expansée.
PCT/FI1996/000368 1995-06-26 1996-06-25 Procede pour empecher l'emission de poussieres par l'argile expansee WO1997001613A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI953165 1995-06-26
FI953165A FI953165A0 (fi) 1995-06-26 1995-06-26 Antihalkmedel och foerfarande foer framstaellning av detsamma
FI955482 1995-11-14
FI955482A FI101293B (fi) 1995-06-26 1995-11-14 Menetelmä kevytsoran pölyämisen vähentämiseksi sekä menetelmän mukaise sti käsitelty kevytsora

Publications (1)

Publication Number Publication Date
WO1997001613A1 true WO1997001613A1 (fr) 1997-01-16

Family

ID=26159993

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/FI1996/000368 WO1997001613A1 (fr) 1995-06-26 1996-06-25 Procede pour empecher l'emission de poussieres par l'argile expansee
PCT/FI1996/000367 WO1997001612A1 (fr) 1995-06-26 1996-06-25 Melange anti-derapage et procede de fabrication associe

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000367 WO1997001612A1 (fr) 1995-06-26 1996-06-25 Melange anti-derapage et procede de fabrication associe

Country Status (2)

Country Link
FI (1) FI101293B (fr)
WO (2) WO1997001613A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2359932C1 (ru) * 2008-03-27 2009-06-27 Юлия Алексеевна Щепочкина Способ изготовления керамзитового гравия

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6893582B2 (en) 2000-02-22 2005-05-17 Clearwater International, L.L.C. Method of heating a fluid using a line heater comprising an alkali metal formate
US6569348B1 (en) 2001-08-31 2003-05-27 Clearwater, Inc. Treating coal and other piled materials to inhibit freeze-binding
US6495063B1 (en) * 2001-08-31 2002-12-17 Clearwater, Inc. Treating coal and other piled materials to inhibit freeze binding
CA2452758A1 (fr) 2002-04-17 2003-10-30 Clearwater International, Llc Optimisation de la temperature de l'air d'entree pour turbines a gaz utilisant un fluide echangeur de chaleur comprenant un formate de metal alcalin
US7060198B2 (en) 2002-05-08 2006-06-13 Clearwater International, L.L.C. Heat exchange fluids comprising amine carboxylates
ITRE20050062A1 (it) * 2005-05-30 2005-08-29 Leo Claudia Materiale antigelo per siti esterni,tipicamente opere viarie
CN114196378A (zh) * 2021-12-10 2022-03-18 煤炭科学技术研究院有限公司 一种无氯环保融雪剂及其制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61113682A (ja) * 1984-11-08 1986-05-31 Tsukasa Doro Kk 粉塵防止剤
US5415795A (en) * 1994-06-16 1995-05-16 Betz Laboratories, Inc. Methods for controlling dust in high temperature systems by contacting dust with an aqueous sodium silicate solution

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1222403B (it) * 1987-07-30 1990-09-05 Alberto Canzani Composizione leggera attivante di attrico e dotata di proprieta' disgelanti,particolarmente per impiego su superfici innevate o gelate
GB8829701D0 (en) * 1988-12-20 1989-02-15 Bp Chem Int Ltd Deicing compositions

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61113682A (ja) * 1984-11-08 1986-05-31 Tsukasa Doro Kk 粉塵防止剤
US5415795A (en) * 1994-06-16 1995-05-16 Betz Laboratories, Inc. Methods for controlling dust in high temperature systems by contacting dust with an aqueous sodium silicate solution

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 10, No. 296, C-377; & JP,A,61 113 682 (TSUKASA DORO K.K.), 31 May 1986. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2359932C1 (ru) * 2008-03-27 2009-06-27 Юлия Алексеевна Щепочкина Способ изготовления керамзитового гравия

Also Published As

Publication number Publication date
FI955482A0 (fi) 1995-11-14
FI955482L (fi) 1996-12-27
FI101293B1 (fi) 1998-05-29
FI101293B (fi) 1998-05-29
WO1997001612A1 (fr) 1997-01-16

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