RU2749769C1 - Method for producing glass reflective spherical materials - Google Patents

Abstract

FIELD: road construction.SUBSTANCE: invention relates to the field of road surfaces and can be used in the production of reflective glass spherical materials. The method for producing reflective glass spherical materials includes grinding of cullet, feeding the molding material into the plasma burner of an electric arc plasma torch, melt formation, cooling of glass spherical materials, accumulation of glass spherical materials in the collector. Cullet is used after fractional sieving with a granule size of 630-2500 microns. Fractionated cullet and superdispersed aluminum powder are portioned to the first and second powder feeders of the plasma torch of the electric arc plasma torch, respectively. Then the superdispersed aluminum powder with the plasma-forming gas argon is fed into the plasma burner of the electric arc plasma torch. After that, the fractionated glass shot is fed to the plasma burner section in the plasma torch of the electric arc plasma torch in the argon plasma stream enriched with aluminum vapor. The formation of the melt is carried out by melting glass granules to form spherical particles, which are deposited by evaporation of superdispersed aluminum powder.EFFECT: increase in the quality of glass spherical materials.1 cl, 3 tbl

Description

The invention relates to the field of road surfaces and can be used to obtain glass reflective spherical materials.

Methods for producing glass spherical materials are known from the prior art, the disadvantage of which is their low reflectivity.

The closest solution to the proposed method in terms of the technical essence and the achieved result is a method for producing glass reflective spherical materials, including grinding cullet, molding a charge with the manufacture of rods, feeding them into a plasma torch of an electric arc plasmatron, forming and dispersing a melt, gradual cooling of microspheres in a stream of outgoing plasma-forming gases, and then, when they come into contact with a water-cooled metal hemisphere, the supply of microspheres to the vibrating sieve and the accumulation of microspheres in the collection [Bessmertny VS, Krokhin VP, Lyashko AA, Dridge NA, Shekhovtsova Zh.E. Obtaining glass microspheres by plasma spraying // Glass and ceramics. 2001, No. 8. - from. 6-7].

The disadvantage of the prototype is the low reflectivity of glass spherical materials.

The technical result of the proposed invention is to improve the quality of glass spherical materials by increasing the reflective ability.

The technical result is achieved by the fact that The method for producing glass reflective spherical materials includes crushing cullet, feeding molding material into the plasma torch of an electric arc plasmatron, forming a melt, cooling glass spherical materials, accumulating glass spherical materials in a collector, and the cullet is used after fractional sieving with a granule size of 630-2500 microns, in addition , fractionated cullet and superfine aluminum powder are fed in portions into the first and second powder feeders of the plasma torch of the electric arc plasmatron, respectively, and then superfine aluminum powder with a plasma-forming gas argon is fed into the plasma torch of the electric arc plasmatron, after which the fractionated glass breakage is fed to the plasma torch cut into the plasma the torch of the electric arc plasmatron into the flow of argon plasma enriched with aluminum vapors, in addition, the formation of the melt is carried out due to the melting of glass granules with the formation of sp spherical particles, which are deposited by evaporation of superfine aluminum powder.

The proposed method differs from the prototype in that:

- cullet is used after fractional sieving with a granule size of 630-2500 microns;

- fractionated cullet and superfine aluminum powder are fed into the first and second powder feeders of the plasma torch of the electric arc plasmatron, respectively, and then the superfine aluminum powder with the plasma-forming argon gas is fed into the plasma torch of the electric arc plasmatron;

- fractionated broken glass is fed to the plasma torch cut into the plasma torch of the electric arc plasmatron into the flow of argon plasma enriched with aluminum vapor;

- the formation of the melt is carried out by melting the glass granules with the formation of spherical particles, on which superfine aluminum powder is deposited by evaporation.

A comparative analysis of the known and proposed methods is presented in table 1.

Table 1

Comparative analysis of known and proposed methods

The known method The proposed method

Подача стержней в плазменную горелку электродугового плазмотрона

Образование расплава и его диспергация

Постепенное охлаждение микрошариков в отходящем потоке плазмообразующих газов, а затем при их соприкосновении с водоохлаждаемой металлической полусферой

Подача микрошариков на вибросито

Накопление стеклянных микрошариков в сборникеCullet crushing

Charge molding with the production of rods

Feeding rods to the plasma torch of the electric arc plasmatron

Melt formation and dispersion

Gradual cooling of microspheres in the exhaust flow of plasma gases, and then, when they come into contact with a water-cooled metal hemisphere

Feeding micro beads on a vibrating sieve

Accumulation of glass microspheres in the collection Cullet crushing

Fractional screening of cullet (granule size 630-2500 microns)

Supply of cullet to the first powder feeder of the plasma torch, the torch of the electric arc plasmatron

Superfine aluminum powder feeding into the second powder feeder of the plasma torch of the electric arc plasmatron

Supply of superfine aluminum powder with plasma-forming argon gas to the plasma torch of the electric arc plasmatron

Supply of fractionated glass breakage to the plasma torch cut into the plasma torch of the electric arc plasmatron

Melting of glass granules with the formation of spherical particles, evaporation of aluminum and its deposition on the surface of glass spherical materials and their cooling

Accumulation of glass spherical materials in a collection

Superfine aluminum powder is fed into the second powder feeder of the plasma torch of the electric arc plasmatron, and from it with the plasma-forming gas argon into the plasma torch of the electric arc plasmatron, to obtain aluminum vapors in the argon atmosphere of the plasma torch of the plasma torch, which are deposited on the surface of glass reflective spherical materials, creating surface layer of aluminum with intense reflectivity and gloss.

Technological parameters and properties of glass reflective spherical materials of the known and proposed methods are presented in table 2.

table 2

Technological parameters and properties of glass reflective spherical materials of the known and proposed methods

No.
p / p Parameter name The known method The proposed method one Plasmatron UPU-8M UPU-8M 2 Plasma torch GN-5r GN-5r 3 Plasma gas Argon Argon four Plasma-forming gas consumption, g / s 0.00093-0.00163 0.00093-0.00140 five Current, A 350-450 300-350 6 Voltage, V thirty thirty 7 The size of glass reflective spherical materials, microns 80-1450 630-2500 eight Diffuse reflectance *,% 70-72 80-82

* - according to our own research.

Optimal technological parameters for obtaining glass reflective spherical materials, experimentally obtained, are presented in Table 3.

Table 3

Optimum technological parameters for obtaining glass reflective spherical materials

No. Current, A Argon consumption, g / s Material consumption, g / s BWW,% Glass powder Aluminum powder one 300 0.00093 10 0.5 77 fifteen 1.0 79 twenty 1.5 78 0.00116 10 0.5 79 fifteen 1.0 80 twenty 78 0.00140 10 0.5 77 fifteen 1.0 78 twenty 1.5 76 2 300 ** 0.00093 25 0.5 78 thirty 1.0 79 35 1.5 80 0.00116 ** 25 0.5 80 thirty 1.0 81 35 1.5 82 0.00140 25 0.5 79 thirty 1.0 80 35 1.5 81 3 350 ** 0.00093 10 1.0 79 fifteen 1.5 80 twenty 2.0 81 0.00116 ** 10 1.0 80 fifteen 1.5 81 twenty 2.0 81 0.00140 10 1.0 78 fifteen 1.5 79 twenty 2.0 80 four 350 0.00093 25 1.0 77 thirty 1.5 78 35 2.0 80 0.00116 25 1.0 78 thirty 1.5 79 35 2.0 81 0.00140 25 1.0 76 thirty 1.5 78 35 2.0 79

** - the best option.

The test results showed (Table 2) that with a diffusion reflectance coefficient (DRC) of glass reflective spherical materials of 80-82%, the neutral environment of argon prevents the oxidation of aluminum and makes it possible to obtain glass reflective spherical materials.

Example

Broken sheet glass is ground in a porcelain ball mill and sieved on sieves. The cullet fraction with a size of 630-2500 microns is placed in the first powder feeder of the electric arc plasmatron, and aluminum powder of ASD-4 grade is fed into the second powder feeder.

The plasma torch GN-5r of the UPU-8M electric arc plasmatron is ignited with the following parameters: current 300-350 A, voltage 30 V. Plasma-forming gas was argon. Its flow rate and water flow rate for cooling the plasma torch were 0.00116 g / sec and 10-12 l / min. respectively. From the second feeder, using the dynamic pressure of the plasma-forming gas, aluminum powder ASD-4 (TU 1791-99-019-98) is fed into the GN-5r plasma torch, where aluminum vapor was formed under the action of high plasma temperatures in the plasma torch.

The plasma torch temperature was 7850 ° C (calculated using the SAGA equation).

Fractionated breakage of sheet glass with a size of 630-2500 microns was fed to the plasma torch cut. Under the action of high temperatures in the plasma torch, glass granules melted with the formation of molten spherical particles.

In the flow of the exhaust plasma-forming gas, glass reflective spherical materials hardened and aluminum vapor deposited on their surface.

The synthesized glass reflective spherical materials were collected in a collector and tested for reflectivity.

The aluminum coating has a high reflectivity, which is characterized by the value of the EDV. EDV was determined on a POS-1 device. The test results showed that the DRV lies in the range of 80-82%, which is higher than that of glass reflective spherical materials obtained by the known technology.

Claims (1)

A method for producing glass reflective spherical materials, including crushing cullet, feeding molding material into the plasma torch of an electric arc plasmatron, forming a melt, cooling glass spherical materials, accumulating glass spherical materials in a collection, characterized in that the cullet is used after fractional sieving with a granule size of 630-2500 μm, in addition, fractionated cullet and superfine aluminum powder are fed in portions to the first and second powder feeders of the plasma torch of the electric arc plasmatron, respectively, and then superfine aluminum powder with plasma-forming argon gas is fed into the plasma torch of the electric arc plasmatron, after which the fractionated broken glass is fed to the cut plasma torch into the plasma torch of the electric arc plasmatron into the flow of argon plasma enriched with aluminum vapors, in addition, the formation of the melt is carried out by melting the granules of the stack la c the formation of spherical particles, which are deposited by evaporation of superfine aluminum powder.