CN102826736A - Method for preparing hollow glass bead by using glass powder process - Google Patents

Abstract

The invention discloses a method for preparing hollow glass microspheres by a glass powder method, which includes batching, melting, pulverizing, hollow spheroidizing, collecting, screening, and testing. Under the action, it is sprayed through the porous nozzle to form molten glass droplets splashing downward. The molten glass droplets collide with the surface of the high-speed rotating drum during the falling process. Under the joint action of gravity, centrifugal force and sputtering force, glass particles with a particle size between 1 and 100 microns are formed; the innovation of this invention is to use a new centrifugal crushing instead of water crushing→drying→coarse crushing in the original production process. The process of crushing→fine crushing simplifies the production process, reduces energy consumption, reduces equipment and personnel costs, and is easy to control operation and quality; the invention can reduce production costs by 14-20% and increase compressive strength by 4.8-15%.

Description

A kind of method for preparing hollow glass microspheres by glass powder method

Technical field:

The invention relates to a production process of hollow glass microspheres, and more specifically, relates to a method for preparing hollow glass microspheres by a glass powder method.

Background technique:

Hollow glass microspheres are hollow spherical glass powders containing one or several inert gases, with a particle size distribution ranging from a few microns to hundreds of microns. The unique structure makes it have the characteristics of low density, good fluidity, low thermal conductivity, high compressive strength, and good chemical stability. It has been used in aerospace, oil exploration, deep-sea floating body materials, emulsion explosives, advanced insulation materials, Military, civilian and high-tech fields such as wall heat insulation and fireproof materials.

The preparation methods of hollow glass microspheres mainly include dry gel method, liquid drop method and glass powder method. Due to the limitation of preparation methods, the strength of hollow glass microspheres prepared by dry gel method and liquid drop method is relatively low, and high-end hollow glass The production of microbeads generally adopts the glass powder method.

The production process of the glass powder method is mainly: 1 batching → 2 melting → 3 water crushing → 4 drying → 5 coarse crushing → 6 fine crushing → 7 hollow spheroidization → 8 collection → 9 screening → 10 inspection, the melting of ingredients is prepared according to requirements For different types of products, hollow spheroidization is a necessary process for product molding. It is a relatively mature and stable process at present. From the perspective of industrialization, the operation process of 3 water crushing → 4 drying → 5 coarse crushing → 6 fine crushing is relatively cumbersome , the production process is complicated, the equipment is many, the energy consumption is high, the efficiency is low, and the uncontrollability of the product is increased. The specific process of this section of the process is as follows: firstly, slowly pour the molten glass from the melting furnace into a water tank filled with cold water, and through water quenching and rapid cooling, the molten glass will be turned into broken glass, and then it will be taken out and dried and passed through the The roller crusher crushes it into glass fragments below 2 mm, and the standard glass fragments are sent to the jet mill to be crushed into glass powders of 1-100 microns. During the crushing process, the introduction of impurities such as iron leads to changes in the composition of the glass beads, which reduces the performance indicators of the hollow glass beads and brings noise and dust pollution; the input of energy and labor costs increases the production cost, and the control nodes The increase also increases the difficulty to the quality control of hollow glass microspheres.

Contents of the invention

The object of the present invention is to provide an easy-to-operate and control method for preparing hollow glass microspheres by glass powder method, which reduces production cost by 14-20% and increases compressive strength by 4.8-15%.

The object of the present invention is achieved by improving the pulverizing step in the preparation process as follows, a method for preparing hollow glass microspheres by glass powder method, including batching, melting, pulverizing, hollow spheroidizing, collecting, screening, testing, the present invention The innovative point is to simplify the process of water crushing→drying→coarse crushing→fine crushing in the existing production process to centrifugal crushing in one step. The nozzle is ejected to form molten glass droplets splashing downward. The molten glass droplets collide with the surface of the high-speed rotating drum during the falling process. The circulating water is passed into the drum to cool. Under the joint action of sputtering force, glass particles with a particle size between 1 and 100 microns are formed and thrown into the powder collection bin.

The further technical solution of the present invention is that the particle size of the glass droplets formed is controlled by adjusting the rotational speed of the drum and the pressure of the injection gas.

The invention improves the production process of hollow glass microspheres by glass powder method, adopts a new centrifugal crushing method to replace the process of water crushing → drying → coarse crushing → fine crushing in the original production process, simplifies the production process, reduces energy consumption, reduces Equipment and personnel costs, operation and quality are easy to control, and the water quenching effect is better; the invention can reduce the production cost by 14-20%, and increase the compressive strength by 4.8-15%.

Detailed ways

Example 1

Use a glass formula with a product density of 0.25 g/ ^cm3 to configure glass raw materials, put the prepared and uniformly mixed glass raw materials into a furnace for melting, the melting temperature is 1500 ° C ~ 1600 ° C, and the melting time is 1 ~ 3 hours , the molten glass is sprayed downward through the porous nozzle under the action of 2.4Mpa high-pressure gas, forming high-speed glass droplets that sputter downward rapidly, and collide with the surface of the 900r/min high-speed drum during the falling process. The drops are thrown into glass powder with a median particle size of about 15 microns under the joint action of gravity, centrifugal force and sputtering force. The glass powder is mixed with air and sprayed into the beading furnace, and rapidly hollowed into spheres in a temperature field of 1580°C. The hollow spheroidized powder is mainly collected by the cyclone dust collector, and the remaining ultrafine powder is collected by the bag filter. The collected powder is sorted by the hollow glass microsphere floating separation device, the hollow glass microsphere is separated from the glass microsphere, and dried and classified at the same time to produce a density of 0.25±0.02g/cm ³ , a compressive strength of 9Mp, and a floating Hollow glass microspheres with an efficiency ≥ 98%, the compressive strength is increased by 12.5%, and the production cost is reduced by 19%.

Example 2

Use a glass formula with a product density of 0.4g/ ^cm3 to configure glass raw materials, put the prepared and uniformly mixed glass raw materials into a furnace for melting, the melting temperature is 1480-1580°C, and the melting time is 1-3 hours. The molten glass is sprayed downward through the porous nozzle under the action of 2.2Mpa high-pressure gas, forming high-speed glass droplets sputtered downward rapidly, and colliding with the surface of the 800r/min high-speed drum during the falling process, the glass droplets Under the joint action of gravity, centrifugal force and sputtering force, it is thrown into glass powder with a median particle size of about 20 microns. The glass powder is mixed with air and sprayed into the beading furnace, and is rapidly hollowed into spheres in a temperature field of 1540°C. The hollow spheroidized powder is mainly collected by the cyclone dust collector, and the remaining ultrafine powder is collected by the bag filter. The collected powder is sorted by the hollow glass microsphere drifting device, and the hollow glass microsphere is separated from the glass microsphere, and is dried and classified at the same time to produce a density of 0.4±0.02g/cm ³ and a compressive strength of 40 Mp. Hollow glass microspheres with a floating rate ≥ 95% can increase the compressive strength by 11.1% and reduce production costs by 17%.

Example 3

Use a glass formula with a product density of 0.7g/ ^cm3 to configure glass raw materials, put the prepared and uniformly mixed glass raw materials into a furnace for melting, the melting temperature is 1450-1550 °C, and the melting time is 1-3 hours. The molten glass is sprayed downward through the porous nozzle under the action of 2.1Mpa high-pressure gas, forming high-speed glass droplets sputtered downward rapidly, and colliding with the surface of the 700r/min high-speed drum during the falling process, the glass droplets Under the joint action of gravity, centrifugal force and sputtering force, it is thrown into glass powder with a median particle size of about 25 microns. The glass powder is mixed with air and sprayed into the beading furnace, and rapidly hollowed into spheres in a temperature field of 1500°C. The hollow spheroidized powder is mainly collected by the cyclone dust collector, and the remaining ultrafine powder is collected by the bag filter. The collected powder is sorted by the hollow glass microsphere drifting device, and the hollow glass microsphere is separated from the glass microsphere. At the same time, it is dried and classified to produce a density of 0.7±0.02g/cm ³ and a compressive strength of 131 Mp. Hollow glass microspheres with a floating rate ≥ 96% can increase the compressive strength by 5% and reduce the production cost by 14%.

It should be pointed out that the so-called compressive strength refers to the isostatic pressure applied to the hollow glass microspheres via gas or liquid conduction. When the hollow glass microspheres are broken by 10% (volume ratio), the corresponding strength is its compressive strength. The specific data comparison can be seen in Table 1. Compressive strength, density and cost analysis of hollow glass microspheres with three different formulations.

Table I

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form; any person skilled in the art can use the above disclosure without departing from the scope of the technical solution of the present invention. Methods and Technical Contents Many possible changes and modifications are made to the technical solution of the present invention, or modified into equivalent embodiments with equivalent changes. Therefore, any simple modifications, equivalent replacements, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention, which do not deviate from the technical solutions of the present invention, still fall within the protection scope of the technical solutions of the present invention.

Claims (2)

1. a glass powder legal system is equipped with the method for hollow glass micropearl; Comprise batching, fusion, pulverizing, hollow nodularization, collection, screening, check; It is characterized in that; Said pulverising step is operated as follows: the glass metal after the fusing through the porous nozzle ejection, makes it to form the melten glass drop that splashes down downwards under the above high pressure gas effect of 2MPa, and the melten glass drop collides with the drum surface of high speed rotating in dropping process; Feed the recirculated water cooling in the rotary drum, the acting in conjunction that glass metal drops in gravity, cf-, sputter power form down particle diameter between 1～100 micron glass particle and get rid of in the powder collecting bin.

2. a kind of glass powder legal system according to claim 1 is equipped with the method for hollow glass micropearl, it is characterized in that, said glass drop forms the size of particle diameter through regulating the pressure-controlling of rotary drum rotating speed and sparging gases.