CN1076671A

CN1076671A - A kind of manufacture method of lava foam glass

Info

Publication number: CN1076671A
Application number: CN 93110149
Authority: CN
Inventors: 李长志; 杨柯南; 李长玉
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-06
Filing date: 1993-03-06
Publication date: 1993-09-29

Abstract

The present invention relates to a kind of machining manufacture of lagging material.Providing a kind of is aggregate with the perlite, is the multicellular glass manufacture method of whipping agent with lime carbonate; Through technological processs such as batch mixing → oven dry → dress moulds → burn till → cool off, thereby make the firing temperature reduction, and extensively utilize natural resources; Reach the reduction product cost, improve qualification rate, the purpose of simplifying working process.The product that makes with present method is characterized in that pore is a sealed porosity, does not absorb water, and heat-insulating property is good, and capacity is little, and is high temperature resistant, and the intensity height is the advanced material of insulation cold insulation.

Description

A kind of manufacture method of lava foam glass

The present invention relates to a kind of machining manufacture of lagging material.

Making method of foam glass at present is to be filled in the mould after starting material are fully pulverized mixing according to a certain ratio, and delivering to then slowly to cool off after the foamable moulding in the sintering oven becomes goods.As the carbon black of whipping agent, lime carbonate, rhombspar, sesame nitre etc., be in heat-processed, combine or produce gas by self thermolysis with airborne oxygen, make the glass foaming of having softened because of heating.Mould as for foaming is used generally can adopt heating resisting metal material or refractory materials.If blowing temperature surpasses 800 ℃, to the thermotolerance requirement rising of metallic substance, the mould cost is just high, and at high temperature the intensity of mould significantly reduces, and obviously shorten work-ing life.Therefore, consider the life-span of mould and the cost issues of fuel, preferably foaming at low temperatures.

For multicellular glass, because of the raw material difference, can be divided into two big classes: a class is to be aggregate with glass cullet; Another kind of is to be aggregate with material from acidic volcanic glass matter magma; Also there are both to mix, but all exist following deficiency.

1. with glass cullet the multicellular glass of aggregate, the main lower soda-lime glasss of softening temperature such as sheet glass and container glass that adopt, and whipping agent is used carbon black usually, sintering temperature is more than 800 ℃, be generally 820-860 ℃, the shortcoming of making whipping agent of carbon black is, carbon black is easily before glass is softening (about 500 ℃), it in pulverous admixtion the oxidation of some carbon black with the air contact, the gas that produces will be overflowed from the space of the solid powder that do not become glassy phase as yet, cause goods unit weight to be increased, and foaming is uneven because of gas phase reduces.Therefore must adopt some method to stop the loss of this whipping agent, as the method for being introduced in Japanese Patent Publication 3623719, special public clear 3623868 patents, the glass powder of carbon black whipping agent after 700 ℃ of sintering processes, remollescent glass is wrapped up carbon black, again pulverize again and mix foamable; Or in carbon dust oxidational losses temperature range, be rapidly heated, per minute heats up more than 35 ℃, makes the rapid densified sintering product of glass, prevents carbon black and air catalytic oxidation.But any method all can not stop the loss of carbon dust fully, also makes production technique become complicated, the corresponding raising of cost.Therefore, be that the multicellular glass of whipping agent exists the uneven phenomenon of foaming inevitably with the carbon black.In addition, in the temperature more than 800 ℃ foaming, the resistance toheat of metal die is required than higher, and shortened the work-ing life of mould, cost raises to some extent, therefore remains further to be reduced sintering temperature.

2. be the multicellular glass of aggregate with material from acidic volcanic glass matter rock, mainly adopt mine tailings such as perlite, obsidian, phonolite and be whipping agent that blowing temperature is more than 1000 ℃ with sesame nitre.The shortcoming of this method is that sintering temperature is too high, introduces as Chinese CN1030565A patent, and blowing temperature is 1100-1120 ℃, and quite high to the requirement of mould like this, fuel consumption is big, and the cost of kiln raises, and cost is greatly improved.The production method of foam glass trends towards adopting low-temp foaming technology at present, and for metal die, the reduction of blowing temperature means the reduction of mould cost and the prolongation in work-ing life, is very important therefore.

The objective of the invention is to, providing a kind of is aggregate with the perlite, is the multicellular glass manufacture method of whipping agent with lime carbonate; Through technological processs such as batch mixing → oven dry → dress moulds → burn till → cool off, thereby make the firing temperature reduction, and extensively utilize in the natural resources; Reach the reduction product cost, improve qualification rate, the purpose of simplifying working process.

The objective of the invention is to realize by following technical measures:

A, its technological process are: perlite is pulverized the 80-100 order, again with 200-300 purpose lime carbonate thorough mixing, the aqueous solution that adds caustic soda, borax, sodium phosphate, Vanadium Pentoxide in FLAKES or potassium hydroxide then stirs, soaked again 12 hours, oven dry then, again be crushed to 50 orders dress mould again, the demoulding after in 650-780 ℃ of stove, burning till;

The weight proportion of b, its raw material is:

Perlite or pearlstone 100(part)

Caustic soda 15-40(part)

Borax 1-10(part)

Sodium phosphate 1-5(part)

Vanadium Pentoxide in FLAKES 0.005-1(part) or potassium hydroxide 5-15(part)

Lime carbonate 0.5-5(part)

Water 50-150(part).

Described perlite also can adopt meticulous tail powder in the exploitation perlite ore deposit, and its composition range is: SiO ₂68-75%; Al ₂O ₃9.0-14%; Fe ₂O ₃0.9-4%; CaO1.0-2.0%; K ₂ONa ₂O4-10%; MgO0.4-1.0%; Crystal water 4-6%.

The control of the temperature of described firing process is: it is 200 ℃ that powder is gone into the kiln temperature, slowly heats up with per minute 2-5 ℃ speed then, reaches after the sintering temperature insulation 1-3 hour, is cooled to 40-70 ℃ of kiln discharge with per minute 0.5-1.0 ℃ speed again; In its press setter skill, the dress modulus is 30% volume percent.

Advantage of the present invention and positively effect are:

1. be aggregate with the expanded pearlite rock, also can adopt meticulous tail powder or the pearlstone production waste in exploitation perlite ore deposit, can utilize natural resources widely like this.

2. be whipping agent with lime carbonate, the uneven shortcoming of goods foaming improves product percent of pass when having prevented to make whipping agent with carbon black, and production technique is simple.

3. further reduced blowing temperature, compare with the multicellular glass of glass cullet technology manufacturing, maximum sintering temperature can reduce 40-150 ℃, so cylinder iron or the mould made of general general carbon steel can use, and prolonged the work-ing life of mould and kiln widely and fuel consumption is reduced, thereby greatly reduced product cost.

4. the product pore that utilizes the present invention to produce is small, even, based on closed pore, do not absorb water, do not burn, easily processing, sound-insulating cold insulation performance is good, capacity is little, intensity is high, be ideal insulation, cold insulation material, can be widely used in the cold insulation of oil, chemical engineering and the protection against the tide insulation of construction work, have great energy-saving effect.

Description of drawings is as follows:

Fig. 1 is a technological process block-diagram of the present invention;

Fig. 2 is the temperature and time graphic representation of firing process of the present invention.

Below in conjunction with accompanying drawing, technical characterictic of the present invention is described in further detail by embodiment:

As shown in Figure 1, perlite will be crushed to the 80-100 order, can pulverize as adopting raw ore fine powder or pearlstone waste material.Lime carbonate requires granularity at the 200-300 order, and its granularity is more little, disperses evenly more, and then foaming is also even more.Other additives are all directly water-soluble, mix with powder then, soak 12 hours.Oven dry can be adopted the kiln waste gas heating, adorns mould then, send sintering in the tunnel furnace, heats up, is incubated, cools off by certain heat-up rate, and the back demoulding of coming out of the stove is goods.Wherein caustic soda is a fusing assistant, and add-on is very few, and firing temperature is too high, and add-on is too much, and cost raises, so be advisable with 15-40 part, can make blowing temperature like this in 650-780 ℃ of scope.Borax is that crystallization prevents agent, prevents multicellular glass crystallization in process of cooling.Vanadium Pentoxide in FLAKES or potassium hydroxide are tensio-active agent, and it can reduce the surface tension of glass, and making pore is closed pore.Sodium phosphate is a foaming stabiliser.Lime carbonate is whipping agent, the too much easy crystallization of its consumption, and the very few easy foaming of consumption is uneven, only is advisable between 0.5-5 part.

As shown in Figure 2, the pre-heating stage of firing temperature, promptly from 200 ℃ of the starting temperatures of going into kiln in firing range, heat-up rate is per minute 2-5 ℃, under the slow situation of heat-up rate, soaking time can correspondingly shorten; Under the fast situation of heat-up rate, soaking time should corresponding prolongation.According to the heat-up rate difference, soaking time is within 1-3 hour scope.Speed of cooling is per minute 0.5-1 ℃.Because of the multicellular glass body after the foaming itself is lagging material, thermal conductivity very little (0.03-0.05W/m.K) so speed of cooling must slow down, otherwise can cause the explosion of goods.

Illustrate below:

Embodiment one: 100 parts of perlites, 15 parts of caustic soda, 10 parts of boraxs, 5 parts of sodium phosphates, 0.005 part of Vanadium Pentoxide in FLAKES or 5 parts of potassium hydroxide, 0.5 part of lime carbonate, 50 parts of water are made admixtion, oven dry, pulverizing, dress mould, send into then in the continous way tunnel kiln, speed with 2 ℃ of per minutes heats up, to 780 ℃, be incubated 1 hour, lower the temperature with the speed of 1 ℃ of per minute then, come out of the stove to 70 ℃, the demoulding is goods.The multicellular glass capacity that this example is produced is 0.47g/cm ³, water-intake rate is less than 0.2%, and ultimate compression strength is 3.20MPa, and thermal conductivity is 0.045W/mK.

Embodiment two: 100 parts of pearlstones, 40 parts of caustic soda, 1 part of borax, 1 part of sodium phosphate, 1 part of Vanadium Pentoxide in FLAKES or 15 parts of potassium hydroxide, 5 parts of lime carbonate, 150 parts of water are made admixtion, oven dry, pulverize, adorn mould, send into then in the sintering oven, the speed intensification with 5 ℃ of per minutes rises to 650 ℃ from 200 ℃, be incubated 3 hours then, speed with 0.5 ℃/min is cooled to 40 ℃ again, comes out of the stove, and the demoulding is goods.The unit weight of this routine products obtained therefrom is 0.15g/cm ³, water-intake rate is less than 0.2%, and ultimate compression strength is 2.10MPa, and thermal conductivity is 0.03W/mK.

The product that makes with present method is characterized in that pore is a sealed porosity, does not absorb water, and heat-insulating property is good, and capacity is little, and is high temperature resistant, and the intensity height is the advanced material of insulation cold insulation.

Claims

1, a kind of manufacture method of lava foam glass,

A, its technological process are:

Perlite is pulverized the 80-100 order, again with 200-300 purpose lime carbonate thorough mixing, the aqueous solution that adds caustic soda, borax, sodium phosphate, Vanadium Pentoxide in FLAKES or potassium hydroxide then stirs, soaked again 12 hours, oven dry then, again be crushed to 50 orders dress mould again, the demoulding after in 650-780 ℃ of stove, burning till;

The weight proportion of b, its raw material is:

Perlite or pearlstone 100 (part)

Caustic soda 15-40 (part)

Borax 1-10 (part)

Sodium phosphate 1-5 (part)

Vanadium Pentoxide in FLAKES 0.005-1 (part) or potassium hydroxide 5-15 (part)

Lime carbonate 0.5-5 (part)

Water 50-150 (part).

2, the manufacture method of lava foam glass according to claim 1 is characterized in that described perlite also can adopt meticulous tail powder in the exploitation perlite ore deposit, and its composition range is:

SiO ₂68-75%;

Al ₂O ₃9.0-14%;

Fe ₂O ₃0.9-4%;

CaO 1.0-2.0%;

K ₂O·Na ₂O 4-10%;

MgO 0.4-1.0%;

Crystal water 4-6%.

3, the manufacture method of lava foam glass as claimed in claim 1 or 2, the temperature control that it is characterized in that described firing process is: it is 200 ℃ that powder is gone into the kiln temperature, slowly heat up with per minute 2-5 ℃ speed then, reach after the sintering temperature insulation 1-3 hour, and be cooled to 40-70 ℃ of kiln discharge with per minute 0.5-1.0 ℃ speed again; In its press setter skill, the dress modulus is 30% volume percent.