SU1640131A1 - Method of producing expanded pearlite - Google Patents

Description

t

(21) 4467410/33, 4467411/33

(22) 07.29.88

(46) 04/07/91. Bul № 13 (71) Scientific and Production Association Stone and silicates1 (72). G.G.Akopn, N.V.Gurgen, N.T.Tono, N.Ya.Abov and R.S.Farmaz n

(53) 666.972 (088.8)

(56) Sukharev M.F., Meisel I.L., Sandler V.G. Production of thermal insulation materials. - M., 1981,

with. 167.

USSR Author's Certificate No. 640985, cl. From 04 To 14/18, From O4 to 20/06, 1976.

(54) METHOD FOR OBTAINING EXTENDED PERLITE

(57) The invention relates to the building materials industry and can be used to produce lightweight heat and sound insulation materials based on expanded perlite. The purpose of the invention is to improve the sound insulation properties at frequencies of 100-630 Hz. The method for producing expanded perlite includes dividing the original rock into densities, crushing the rock of each density separately, fractioning and roasting each fraction at 900-1.00 ° C. The sound absorption coefficient at frequencies of 100-630 Hz composition, t 0.14-0.83. The obtained perlite can be used in the process for the production of thermally insulated perlite fiber material. The method of obtaining heat and sound insulating perlite fiber material involves mixing the expanded perlite with a fiber component and a water repellent, forming and drying products. The content of water-repellent. in the obtained products x 0.17-0.20 wt.%, their compressive strength at 10% linear strain is 0.74-0.98 MPa. 3 tab.

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The invention relates to the building materials industry and can be used to obtain sound and thermal insulation materials based on expanded perlite.

The aim of the invention is to improve the sound insulation properties at frequencies of 100-630 Hz.

Expanded perlite was prepared as follows.

Perlite rock is selectively mined by thin excavation layers that provide uniform density of the raw material. The density of the breed used is 1000, 1700 and .2100 kg / m. The rock was crushed by density on a crusher of any industrial type used in the perlite processing lines, fractionated into fractions stipulated by GOST 25226-82 and narrower: 0.14-0.31; 0.31-0.63; 0.63-1.25; 1.25-2.5 mm. Then the rock of a certain density and fraction is subjected to firing according to the technology of expansion using the method of thermal shock in a vertical furnace. The temperature in the furnace is 900-1100PC. Get expanded perlite with a bulk weight of 14-85 kg / m3.

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Sound-absorbing properties are estimated from the frequency response (with a normal incidence of sound in the frequency range 100-1800 Hz) in an acoustic interferometer.

In tab. Figure 1 shows the sound absorption coefficients (CVD) of the released perlite depending on the density of the rock and the size of the intumescent fractions at a layer thickness of 25 mm (calcination temperature of 10 ° C, C).

The perlite obtained by the proposed method can be used in the manufacture of heat insulating perlite-fiber material.

In tab. 2 shows examples for the consumption of components per 1 mg of products with a thickness of 20 mm, a fiber: perlite ratio of 20:30, volume weight of material 150 kg / m, in table. 3 - properties

Perlite separation by density m, kg / m 100017002100

Perlite fractionation and determination of its quantity, kg, for a fraction:

0.63-1.25 26,426,426.4

1.25-2,526,426,426,4

Perlite swelling by fractions of a certain density, bulk density, kg / m, of the obtained perlite from fractions

0.63-1.25405070

1.25-2.5666880

Mixing expanded perlite with fiber component and hydrophobic additive:

The amount of expanded perlite, kg, for fraction

0.63-1.2524 2424

1.25-2.5L2424

materials, the compositions of which are given in table. 2

The materials obtained on the basis of the proposed perlite, have a high compressive strength, with 10% linear deformation, while reducing the consumption of water-repellent agent.

Claims (1)

Invention Formula The method for producing expanded perlite, including crushing of the original rock, fractionation and roasting of each fraction at 900-1100 ° C, characterized in that, in order to improve the sound insulation properties at frequencies of 100-630 Hz, the original rock before crushing is divided by density, and crushing is carried out for each density separately. Table t Technological parameters The amount of fiber component, kg, for fraction 0.63-1.255,945,945,94 1.25-2.55,945,945,94 The amount of water-repellent agent, kg for fraction 0.63-1.25 0.060.060.06 1.25-2.50.050.050.05 Molding moisture freshly molded samples (drying): temperature, ° C-, 180180180 time, h 2.5-3 2.5-32.5 Continuation of table 2 Indicators for testing : i: zi Table3