CN102173567A - Method for preparing fiber reinforced microcrystalline glass insulation material - Google Patents

Abstract

The invention relates to a method for preparing a fiber reinforced microcrystalline glass insulation material, which is characterized by comprising the following steps of: (1) firstly, obtaining a slag staple fiber through the centrifugal blowing process at a high-temperature liquid slag outlet of an industrial furnace; (2) pulverizing microcrystalline glass into 0.1-0.5 mm particles to obtain microcrystalline glass waste particles; (3) selecting the following raw materials for later use in percentage by weight: 23-35% of slag staple fiber, 60-75% of microcrystalline glass waste particles and 2-7% of foaming agent; uniformly mixing the slag staple fiber, the microcrystalline glass waste particles and the foaming agent to obtain a mixture; and (4) loading the mixture into a die, heating the die to 850-950 DEG C in a calcining kiln, maintaining the temperature for 1.0-2.0 h to perform calcine, annealing and cooling the die, taking the material out of the die to form the fiber reinforced microcrystalline glass insulation material. The method provided by the invention is simple, saves energy and resources and is beneficial to environmental protection.

Description

A preparation method of fiber-reinforced glass-ceramic thermal insulation material

technical field

The invention belongs to the technical field of material manufacture, and in particular relates to a method for preparing a fiber-reinforced glass-ceramic thermal insulation material by using liquid industrial slag and glass-ceramic waste.

Background technique

With the rapid development of modern industry, the discharge of industrial solid waste has increased year by year, causing serious pollution and damage to the environment. How to effectively utilize industrial solid waste and protect the environment has attracted widespread attention. At present, the method of producing high-temperature phosphorus slag and metallurgical slag is to export the liquid slag and water quench it to make it into solid particles of a certain size. The method of preparing glass-ceramic by using solid wastes such as phosphorus slag and metallurgical slag as raw materials has been reported. Crystallization and annealing, although these methods can use solid waste, the material preparation process is more complicated, and the mixture needs to be re-melted at high temperature, so the energy consumption is high. In addition, in the production process of architectural decorative glass-ceramics, some waste products and cutting scraps are usually returned to the furnace for high-temperature melting, which consumes a lot of energy.

Contents of the invention

Aiming at the deficiencies of existing industrial solid waste and glass-ceramic waste utilization technologies, the purpose of the present invention is to provide a preparation method of fiber-reinforced glass-ceramic thermal insulation material, which is simple in process, energy-saving, resource-saving, and environmentally friendly.

In order to achieve the above object, the technical solution of the present invention is: a preparation method of fiber-reinforced glass-ceramic thermal insulation material, which is characterized in that it comprises the following steps:

1) First, at the outlet of the high-temperature liquid slag (such as phosphorus slag, steel slag) of the industrial furnace, the slag short fiber is obtained through the centrifugal injection process;

2) crushing the glass-ceramic waste into particles of 0.1 to 0.5 mm in size to obtain glass-ceramic waste particles;

3) According to the percentage by weight of each raw material: short slag fibers 23-35%, glass-ceramic waste particles 60-75%, foaming agent 2-7%, select slag short fibers, glass-ceramic waste particles and foaming agent, for subsequent use; mixing slag short fibers, glass-ceramic waste particles and foaming agent evenly to obtain a mixture;

4) Put the mixture into the mold, and then place it in a firing kiln and heat it to 850°C-950°C (the heating rate from room temperature to 700°C is 4-6°C/min, and the heating rate above 700°C is 6-8°C/min ), heat preservation for 1.0-2.0 hours for firing; then annealing and cooling (down to 600°C at a cooling rate of 15-20°C/min, then down to 250°C at a cooling rate of 0.7-1.2°C/min, and then Cool down to 60°C at a cooling rate of 5-7°C/min), take it out and demould, and obtain a fiber-reinforced glass-ceramic thermal insulation material.

The high-temperature liquid slag is high-temperature liquid phosphorus slag or high-temperature liquid steel slag.

The glass-ceramics waste is waste glass-ceramics for architectural decoration or leftovers of glass-ceramics for architectural decoration.

The foaming agent is any one of carbon powder, dolomite, and mica, or a mixture of any two or more (including any two), and any two or more (including any two) are mixed in any proportion.

The beneficial effects of the present invention are: firstly, the high-temperature liquid slag (phosphorus slag, steel slag) of the industrial furnace is directly made into short fibers as raw materials, which saves resources and is beneficial to environmental protection; The role of the structure, combined with the granular glass-ceramics, increases the overall strength. The third is that the raw materials do not need to be melted at high temperature, the process is simple and a large amount of energy is saved. The 4th, glass-ceramic waste material does not need recrystallization because of itself already is glass-ceramics, only needs to burn and has shortened preparation time greatly.

Compared with other thermal insulation materials, the material of the present invention has dual characteristics of fiber reinforcement and microcrystalline reinforcement, high flexural strength, good chemical stability, good heat insulation performance, and wide service temperature range, and can be used for building and industrial equipment. insulation.

Detailed ways

In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples.

Example 1:

A method for preparing a fiber-reinforced glass-ceramic thermal insulation material, comprising the steps of:

1) First, at the high-temperature liquid slag outlet of the industrial furnace (at the slag outlet of the phosphorus-making electric furnace), the slag short fibers are obtained through a centrifugal blowing process;

2) Crushing the glass-ceramic waste (cutting scraps of glass-ceramics for architectural decoration) into particles of 0.1-0.2 mm to obtain glass-ceramic waste particles;

3) According to the percentage by weight of each raw material: short slag fibers 35%, glass-ceramic waste particles 61%, blowing agent (carbon powder) 4%, choose short slag fibers, glass-ceramic waste particles and blowing agent, Standby; mixing slag short fibers, glass-ceramic waste particles and foaming agent evenly to obtain a mixture;

4) Put the mixture into the mold, then place it in a firing kiln and heat it to 850°C (the temperature rise rate is 5°C/minute from room temperature to 700°C, and the temperature rise rate is 8°C/minute above 700°C), and keep it warm for 1.0 hours for firing Formation, using the principle that the fiber interface is easy to crystallize, a large amount of fibrous glass-ceramics is formed in a short period of time, and the glass-ceramics grains soften and part of the liquid phase appears, and are sintered into a whole material. A certain amount of closed pores are formed in the middle; then annealed and cooled (down to 600°C at a cooling rate of 15°C/min, then down to 250°C at a cooling rate of 1°C/min, and then cooled at a cooling rate of 5°C/min to 60°C), take it out and demould, and obtain fiber-reinforced glass-ceramic thermal insulation material.

The performance indicators of the obtained fiber-reinforced glass-ceramic insulation material are: density 1.7g/cm ³ , flexural strength 30MPa, water absorption < 0.12%, acid resistance 0.011%, alkali resistance 0.014%, service temperature -50℃～ 600°C.

Example 2:

A method for preparing a fiber-reinforced glass-ceramic thermal insulation material, comprising the steps of:

1) First, at the high-temperature liquid slag outlet of the industrial furnace (that is, the slag outlet of the steelmaking furnace), the slag short fibers are obtained through a centrifugal injection process;

2) Crushing the glass-ceramic waste (ie glass-ceramic waste for architectural decoration) into particles of 0.2-0.3 mm to obtain glass-ceramic waste particles;

3) according to the percentage by weight of each raw material: short slag fibers 30%, glass-ceramic waste particles 64%, blowing agent (dolomite) 6%, select short slag fibers, glass-ceramics waste particles and blowing agent, Standby; mixing slag short fibers, glass-ceramic waste particles and foaming agent evenly to obtain a mixture;

4) Put the mixture into the mold, then place it in a firing kiln and heat it to 880°C (the temperature rise rate is 4°C/min from room temperature to 700°C, and the temperature rise rate is 7°C/min from 700°C to 880°C), and keep warm for 1.5 hours Sintering, using the principle that the fiber interface is easy to crystallize, a large amount of fibrous glass-ceramics is formed in a short time, and the glass-ceramic grains soften and part of the liquid phase appears, and sintered into a whole material. At the same time, due to the action of the foaming agent, A certain amount of closed pores are formed in the material; then annealed and cooled (down to 600°C at a cooling rate of 18°C/min, then down to 250°C at a cooling rate of 0.8°C/min, and then at a cooling rate of 6°C/min speed cooling to 60°C), take out and demould, and obtain fiber-reinforced glass-ceramic insulation material.

The performance indicators of the obtained fiber-reinforced glass-ceramic insulation material are: 1.8g/cm ³ , flexural strength 35MPa, water absorption <0.10%, acid resistance 0.010%, alkali resistance 0.013%, service temperature -50℃～600℃ .

Example 3:

A method for preparing a fiber-reinforced glass-ceramic thermal insulation material, comprising the steps of:

1) First, at the high-temperature liquid slag outlet of the industrial furnace (at the slag outlet of the phosphorus-making electric furnace), the slag short fibers are obtained through a centrifugal blowing process;

2) crushing the waste glass-ceramics into particles of 0.3-0.4 mm to obtain waste glass-ceramics granules;

3) According to the percentage by weight of each raw material: short slag fibers 23%, glass-ceramic waste particles 75%, foaming agent (mica) 2%, select short slag fibers, glass-ceramic waste particles and foaming agent, and reserve ; mix the slag short fiber, glass-ceramic waste particles and foaming agent evenly to obtain a mixture;

4) Put the mixture into the mold, then place it in a firing kiln and heat it to 900°C (the temperature rise rate is 6°C/min from room temperature to 700°C, and the temperature rise rate is 8°C/min above 700°C), and keep it warm for 1.5 hours for firing into; then annealed and cooled (down to 600°C at a cooling rate of 20°C/min, then down to 250°C at a cooling rate of 0.7°C/min, and then cooled to 60°C at a cooling rate of 5°C/min), Take it out and demould, and obtain the fiber-reinforced glass-ceramic thermal insulation material.

The performance indicators of the obtained fiber-reinforced glass-ceramic insulation material are: 1.9g/cm ³ , flexural strength 36MPa, water absorption <0.11%, acid resistance 0.010%, alkali resistance 0.013%, service temperature -50℃～600℃ .

Example 4:

A method for preparing a fiber-reinforced glass-ceramic thermal insulation material, comprising the steps of:

1) First, at the high-temperature liquid slag outlet of the industrial furnace (that is, the slag outlet of the steelmaking furnace), the slag short fibers are obtained through a centrifugal injection process;

2) crushing the waste glass-ceramics into particles of 0.4-0.5 mm to obtain waste glass-ceramics granules;

3) According to the percentage by weight of each raw material: short slag fiber 33%, glass-ceramic waste particles 60%, foaming agent 7% (carbon powder 4%, dolomite 3%), select slag short fiber, glass-ceramic Waste granules and foaming agent are used for standby; slag short fibers, glass-ceramic waste particles and foaming agent are evenly mixed to obtain a mixture;

4) Put the mixture into the mold, then place it in a firing kiln and heat it to 950°C (the temperature rise rate is 5°C/min from room temperature to 700°C, and the temperature rise rate is 8°C/min from 700°C to 950°C), and keep warm for 2.0 hours Firing; then annealed, cooled (down to 600°C at a cooling rate of 16°C/min, then down to 250°C at a cooling rate of 1.2°C/min, and then cooled to 60°C at a cooling rate of 6°C/min ), take out the demoulding, and obtain the fiber-reinforced glass-ceramic thermal insulation material.

The performance indicators of the obtained fiber-reinforced glass-ceramic insulation material are: 1.7g/cm ³ , flexural strength 30MPa, water absorption <0.15%, acid resistance 0.011%, alkali resistance 0.014%, service temperature -50℃～600℃ .

Claims (4)

1. the preparation method of a fiber reinforcement devitrified glass lagging material is characterized in that it comprises the steps:

1) at first in the high-temperature liquid state slag outlet of industrial furnace, obtains the slag staple fibre by centrifugal blowing process;

2) the devitrified glass waste material is ground into the particle of 0.1～0.5mm, obtains devitrified glass waste material particle;

3) by the shared weight percentage of each raw material be: slag staple fibre 23～35%, devitrified glass waste material particle 60～75%, whipping agent 2～7%, choose slag staple fibre, devitrified glass waste material particle and whipping agent, standby; Slag staple fibre, devitrified glass waste material particle and whipping agent are mixed, obtain compound;

4) compound is put in the mould, placed calcining kiln to be heated to 850 ℃～950 ℃, insulation then and burnt till in 1.0～2.0 hours; Through annealing, cooling, take out the demoulding then, promptly obtain fiber reinforcement devitrified glass lagging material.

2. the preparation method of a kind of fiber reinforcement devitrified glass lagging material according to claim 1 is characterized in that: described high-temperature liquid state slag is high-temperature liquid state phosphorus slag or high-temperature liquid state slag.

3. the preparation method of a kind of fiber reinforcement devitrified glass lagging material according to claim 1 is characterized in that: described devitrified glass waste material is the scrap stock of architectural decoration devitrified glass waste product or architectural decoration devitrified glass cutting.

4. the preparation method of a kind of fiber reinforcement devitrified glass lagging material according to claim 1, it is characterized in that: described whipping agent is any one or any mixture more than two kinds in carbon dust, rhombspar, the mica, and any is any proportioning when mixing more than two kinds.