RU2708434C1 - Method of making hollow glass microspheres and microballs - Google Patents

Abstract

FIELD: manufacturing technology.

SUBSTANCE: method of making inorganic fine fillers, namely hollow glass microspheres and microballs, which can be used in chemical, shipbuilding aerospace construction industry and other industries, as well as for household purposes. In order to increase production efficiency of achieving high quality of products, reduce material and energy costs, increase productivity, process operations, namely, thermal forming (spherolization) and separation of microspheres or microballs from gas-air medium for independent control of their processes are functionally separated between each other by a passing relay link – settling chamber, wherein the combustion products cooling together with the microsphere or microballs coming out of the furnace is performed by mixing with the autonomous air flow with simultaneous stabilization of the thermal process in the furnace, which enabled to achieve the technical result.

EFFECT: method of making inorganic fine fillers.

1 cl, 1 dwg

Description

The invention relates to the production of inorganic fine fillers, namely glass hollow microspheres and glass beads, which can be used in the chemical, aviation, shipbuilding, space, construction industries and other industries, as well as in the domestic services sector.

The known method, RF patent No. 22338083, C03B 19/10, 2004. (analogue) including operations: grinding of the feedstock and its classification by size groups, feeding the obtained powder into the furnace, thermoforming glass beads, cooling them and separating them from the combustion products, technological equipment connected in one chain located on the suction (exhaust) side air transport systems with microspheres.

The disadvantage of this method is that the equipment of two different technological processes is the process of thermal molding (spherolization) and the process of separating the microspheres from the combustion products are under one control in one technological chain located on the suction side of the system transporting the flow of the gas-air medium (combustion products, air and beads) from the furnace to the fan unit. Such an expression of the method leads to:

1. To the frequent disagreement of technological processes when establishing operating modes of the furnace.

2. To the loss of management effectiveness when the regulation of one process conflicts with another process.

3. The inability to quickly cool the combustion products and beads leaving the furnace at a temperature of 400-500 degrees C to the standard temperature of the gas-air environment, which is discharged after the ventilation installation into the atmosphere.

4. The change in the flow rate of the working medium and the discharge that occurs in the furnace from the operation of technological equipment and air ducts of both processes.

One of the disadvantages listed is a vivid example of the inability of the known method to solve the issue of rapid cooling of combustion products and microspheres leaving the furnace at 400-500 ° C.

At high temperatures, above 200 ° C, the performance of the equipment decreases sharply, there is an accelerated process of adhesion of the microspheres and the formation of cakes of glass on the working internal surfaces of air ducts and devices, which leads to a change in discharge and flow rates of the working medium, which negatively affects the process of thermal molding of microspheres.

These disadvantages of the known method prevent the increase of quantitative and qualitative indicators of glass beads, and in general its effectiveness.

The closest in technical essence and the achieved result of the claimed invention is a method for producing glass microspaces (RF Patent No. 2345959, CL S03B, 1910 2009 (prototype)), including operations:

grinding the feedstock, classifying the glass breaker according to size groups, feeding the obtained powder to the furnace, thermoforming (spherolyzing) glass beads, cooling them and separating the combustion products with two air streams, processing equipment connected in one chain located on the suction (exhaust) side of the system, transporting gas-air medium with beads.

However, this method has the same disadvantages as the previous analogue. Its associated air suction during the separation of microspheres from the combustion products allowed to improve the separation process and lower the temperature of the transporting medium, but not so much as to reach its required value - no more than 200 ° С.

The technical result of the invention is to increase productivity, improve quality, reduce material and energy costs, and generally increase the production efficiency of glass microspheres and beads.

The specified technical result is achieved by the fact that in the known method, including operations:

grinding the feedstock, classifying the glass breaker according to size groups, feeding the obtained powder into the furnace, thermoforming (spherolyzing) the microspheres or microspheres, cooling them and separating them from the combustion products, processing equipment located on the suction (exhaust) side of the system transporting the gas-air medium with microspheres and microspheres, technological operations, namely thermal molding (spherolization) and separation of microspheres or microspheres from a gas-air medium, for autonomously On the control of their processes, they are functionally divided into two parts and interconnected by a relay link - a precipitation chamber, while the microsphere or microspheres coming out of the furnace together with the combustion products form into a stream injected by an autonomous air injection stream, they receive a cooled gas-air stream and direct it into a precipitation chamber connected to a suction gas-air system separating the residual microsphere or beads from the gas-air medium.

The drawing shows a schematic diagram of a technological line for implementing the proposed method.

The main equipment includes:

1. The furnace feeder dimensional glass fiber groups.

2. Furnace for thermal molding (spherolization) of microspheres and beads.

3. Fan for injecting air flow.

4. The injected flow of combustion products in a mixture with a microsphere or beads.

5. Air injection stream.

6. The cooled stream of gas-air medium (air, products of combustion, microspheres or microspheres).

7. Precipitation chamber.

8. Hopper for the deposition of microspheres or beads.

9. The exhaust gas exhaust system.

10. Cyclones for the deposition of residual microspheres or residual beads.

11. Filter.

12. A ventilation unit that creates a suction exhaust gas-air mixed stream.

The proposed method is carried out in the following way.

Glass powder according to size groups obtained from the original erkleza raw material is fed into the hopper of the feeder 1, which doses it and feeds it into the furnace 2, where it thermally forms (spherolyzes) microspheres or microspheres.

The process is carried out in a gas-air mixture burning torch in three stages, conventionally designated by temperature zones:

1. Heating of glass particles to 800 ° C.

2. The formation of a hollow microsphere or glass beads at a temperature of 800-1400 ° C.

3. Cooling the combustion products in a mixture with a microsphere or microspheres to 400-500 degrees C at the exit of the furnace 2, and then:

- at the entrance to the sedimentation chamber up to 200 ° C,

- at an exit from a sedimentary chamber to 150 ° C

- when leaving the suction (exhaust) conveying system in accordance with the requirements of environmental standards.

The formation of spherical microproducts from glass occurs in the fire stream (torch) 2a, during the heating of glass particles they take a spherical shape under the influence of surface tensions (stresses).

A hollow microsphere is obtained from the feedstock with gas-forming additives and whole microspheres from the feedstock without additives.

The process of spherolization thermal molding is carried out in the discharged space of the furnace up to 150-200 Pa at a working medium speed in the furnace up to 10 m / s, their operating values as well as the temperature in the furnace depend on the chemical composition of the feedstock.

When leaving the furnace 2, combustion products with a microsphere or microspheres are formed into a stream 4 injected by an autonomous injection stream 5 by a supply fan 3. After mixing the streams, a cooled stream 6 of a carrier microsphere or microspheres with a temperature of less than 200 ° C corresponding to a volumetric ratio of streams 4 and 5.

The cooled stream 6 is sent to a precipitation chamber 7 connected to a suction exhaust system 9. It is sprayed in the chamber 7, as a result of which the heaviest microspheres and balls settle in hoppers 8, and the lighter (residual fractions) fly off together with air and combustion products into suction (exhaust) gas-air transport system 9, in which the function of separating the microspheres or microspheres is performed by cyclones 10 and filters 11, and the conveying function is performed by the ventilation unit 12.

A gas-air medium separated from microspheres or a microsphere, which meets the requirements of environmental standards, is fed to the utilization of residual heat (if necessary) and to the atmosphere.

Thus, for the autonomous control of the processes of technological operations, namely, thermal molding (spherolization) and separation of microspheres and microspheres from the gas-air medium, they are separated from one another by the relay-transfer link - the precipitation chamber and cooling of the combustion products together with the microsphere and microspheres leaving the furnace by mixing autonomous air flow, while stabilizing the thermal process in the furnace, allowed to achieve a technical result, which corresponds to the recognition Kam of novelty.

Claims (2)

A method of manufacturing glass microspheres or glass beads, including operations: grinding the feedstock, classifying the glass breaker into size groups, feeding the sized groups of glass powder into the furnace, thermoforming (spherolyzing) the microspheres or microspheres, cooling them and separating them from the combustion products, processing equipment for separating the microspheres and microspheres from the gas-air medium, located on the suction (exhaust) ) to the side of the system transporting the gas-air medium with a microsphere and a microsphere, characterized in that the technological operations: thermal molding (spherules ) and the separation of the microspheres and microspheres from the gas-air medium for the autonomous control of their processes, are functionally separated by the relay-transmission link - the precipitation chamber, while the microsphere or microspheres leaving the furnace together with the combustion products form into the stream injected by an autonomous air injection stream, receive a cooled gas-air flow with a microsphere or microspheres and direct it into a precipitation chamber connected by a suction (exhaust) gas-air system, about separating the residual microsphere or residual beads from the gas atmosphere.

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