CN86103637A - Featherweight heat-insulation material of powdery coal cinder - Google Patents

Abstract

The present invention is a main raw material with power plant's waste material flyash, lime putty, asbestos, adds less water glass and gypsum and can be made into ultralight body lagging material.Quality index: 10-15 kilograms/cm of ultimate compression strength ³Thermal conductivity 0.038-0.060 kilocalorie/rice, the time, degree; 3.8-5 kilograms/cm of folding strength ³250-280 kilograms/m of capacity ³Raw material of the present invention is easy to get, and is cheap.

Description

Featherweight heat-insulation material of powdery coal cinder

The present invention is a kind of ultralight body lagging material.It is the ultralight body lagging material of mainly making by power plant's waste material flyash and lime putty.

Increasing along with Highrise buildings, and the developing rapidly of industry such as generating, oilfield exploitation, chemical industry, boats and ships are badly in need of light weight, high-strength, lagging material that thermal conductivity is little.Light weight, high-strength lagging material, material of construction not only can reduce the consumption of the energy in a large number, but also can alleviate the weight of object, and research in recent years has many effects.As US4328034, US3957501, US4453978 etc.

The objective of the invention is to select for use the power plant's waste material-flyash and the raw material lime that is easy to get to make main raw material, preparation ultralight body lagging material, but both decontaminations bring good to and remove all evil, can make cheap lagging material again with higher use value.

The selected raw material of this lagging material is that to contain major ingredient be SiO to levigated ₂, Al ₂O ₃Reach the flyash of CaO and contain the lime putty after clearing up that major ingredient is CaO, also have water glass, refractory fibre and terra alba etc.These raw materials in use will be through prudent screening, and rationally batching is mixed then and heated up, the steam foaming, and steam press maintenance just can make qualified finished product after the oven dry.

Making preferably, the suitable ratio of components of ultralight body lagging material is:

Flyash 50%～65%

Lime 32%～43%

Refractory fibre 3%～7%

Wherein the Chemical Composition content in flyash, the lime fluctuates greatlyyer sometimes, so require the mol of each effective ingredient of control recently to regulate actual charging capacity, now represents the mole ratio of effective ingredient with A, and the calculating formula and the limited range of A value are:

$\mathrm{A=}\frac{X_{\mathrm{c\; a\; o}}}{X_{{\mathrm{S\; i\; o}}_2}{\mathrm{+X}}_{{\mathrm{Al}}_2{O}_3}}\mathrm{=0.78～1.00}$

In the formula: X _CaOContain the calcium oxide mole number in the-prepared product total amount.

$X_{{\mathrm{S\; iO}}_2}\mathrm{+X}{}_{{\mathrm{Al}}_{2}O{}_3}$ Contain SiO in the required flyash of-prepared product total amount ₂And Al ₂O ₃The mole number sum.

When actual feeding intake, obviously, after total charging capacity was determined, after the starting material Chemical Composition was measured, the consumption that calculates flyash, lime putty by last ratio again dropped in the gel cylinder together.

By above-mentioned ratio, flyash, lime and refractory fibre consumption are as the criterion with this total amount after determining again, count by weight percentage water glass (water glass) consumption 0.01～0.20%, and the gypsum consumption is 2-5%, and water is 4-8 times of total amount, doubly is advisable with 5-7.What deserves to be explained is: contained a certain amount of water in the lime putty, when adding Total Water again, the water yield in the lime putty also counts within the Total Water.

The detailed process process of making this ultralight body lagging material is:

One, select materials and get the raw materials ready:

Get CaO content greater than 80% unslaked lime,, filter, and measure the content of CaO in the filter pulp with the 80-120 mesh sieve in advance with 5～10 times of water yield predigestion in jar, this content as above-mentioned material than the foundation of calculating.

Flyash is levigate to more than 180 orders, and oven dry makes moisture content less than 4%, and measures the content of its silicon-dioxide, aluminium sesquioxide and calcium oxide etc., and this content is also as the foundation of above-mentioned material than calculating.Should satisfy following qualification to the flyash specification of quality:

SiO ₂50-70%

Al ₂O ₃15-30%

SiO ₂+ Al ₂O ₃Greater than 75%

Ignition loss is less than 8%

Refractory fibre in the materials generally selects for use asbestos and mineral wool comparatively cheap.

Water glass and terra alba generally are commercially available industrial goods.

Material is got all the ready prefabricated, and screening after expecting that ratio calculating finishes, except that water glass, gypsum, drops in the gel tank in the lump.The water content of lime putty is much smaller than water total amount, and the water yield of deficiency is supplied it by calculating.

Two, gel foaming:

To feed intake mixes intensification, makes a gesture of measuring by material when treating that temperature rises to 100 ℃ to add water glass, terra alba, and insulated and stirred is about 30 minutes.

The colloid of above-mentioned generation gelling is entered foamed pot relaying supervention bubble, foaming can form hollow structure, and foaming must keep 2-4 saturated vapour pressure, and temperature must be higher than 100 ℃, slowly kept 2-4 hour under the stirring at 3-8 rev/min, enter the compressed moulding operation immediately.

Three, compressed moulding:

For making base substrate level and smooth, to add slick filtered water cover on the model, compression moulding under 30～50 tons of pressure.

Four, steam press maintenance:

For making base substrate generation qualitative change, have intensity, generate aquation sulphur Calucium Silicate powder and aquation calcium sulphoaluminate, must under the high-temperature water heat condition, carry out steam press maintenance to base substrate.The pressure of autoclave is high more, and quality of item is good more.Slowly heat up earlier when steam press maintenance heats up and be raised to 6 barometric points in 5 hours, after-acceleration heats up one hour to eight more than the normal atmosphere.Carry out constant-voltage phase then, the time is 10～14 hours, carries out step-down (cooling) thereupon, and the time was controlled at 5 hours, and when pressure reduced to zero, palpus was driven still after stopping half hour, goes out goods.

Five, oven dry:

Go out goods behind the still, must advance the drying shed oven dry, make moisture content below 2%, packing is dispatched from the factory then.

The quality of resulting product of the present invention and technical indicator can reach:

Ultimate compression strength 10kg-15kg/cm ³

Folding strength 3.8kg-5kg/cm ³

Thermal conductivity 0.038 kilocalorie-0.060 kilocalorie/Mi Shidu

Capacity 250kg-280kg/m ³

Ultralight body lagging material of the present invention can be made different type bodies as required, and meal.

These lagging materials can be used for each industrial sector, as lagging material, or weighting material.They are cheap and can bring good to and remove all evil, and have economy and social value.

Example

To contain CaO earlier and be 975 kilograms of 90% unslaked limes, and in the digester of packing into, add 5850 kg of water by the digestion operation and digest, stir and make it to become lime putty.After 100 eye mesh screens filter, squeeze in the lime putty storage tank stand-by.

The water yield required according to total, the water yield of having brought in the deduction lime putty, the water yield 11650 kg of water that need add are squeezed in the gel tank, and stand-by lime putty is also squeezed in the gel tank, puts into SiO simultaneously ₂Content is 50%, Al ₂O ₃Content is 1375 kilograms in 34% flyash, and 140 kilograms in asbestos are warming up to 100 ℃ under whipped state.Add 0.45 kilogram of water glass, 50 kilograms of terra albas are 100 ℃ of following insulated and stirred about 30 minutes, till producing gel.

Gel is all entered in the foamed pot, keep 3 saturation vapour pressure, to become bubble granular dynamically down making it foaming, and this stage finished about 2-4 greatly in individual hour.

Base substrate type shape as required with the granular colloid of finishing after the foaming, is inserted mold, starts compression moulding under ton pressure of oil press to 30～50.

With the base substrate of compression moulding, send into autoclave, the maintenance that adds high pressure makes it to generate aquation sulphur Calucium Silicate powder and aquation calcium sulphoaluminate, and steam press maintenance slowly heats up earlier, rises to 6 normal atmosphere in 5 hours, and after-acceleration heats up and was raised to 8 more than the normal atmosphere in one hour.Constant voltage is 12 hours then, step-down (cooling) 5 hours, and pressure is reduced to and was stopped to drive still after half an hour at 0 o'clock and go out goods.Go out the still goods and advance kiln in 75 ℃-130 ℃ oven dry down.Goods moisture content below 2% promptly the packing dispatch from the factory.

Claims (5)

1, a kind of ultralight body lagging material is characterized in that this material is heated up through digesting, screen batching, mixing by fine-ground fly-ash, lime putty, water glass, refractory fibre, gypsum etc., the steam foaming, steam press maintenance, the oven dry and make, this material suitable proportion (W%) is:

Flyash 50%～65%

Lime 32%～43%

Refractory fibre 3%～7%

Different with aluminium sesquioxide content according to calcium oxide in flyash and the lime, silicon-dioxide, by the numerical definiteness scope of mole ratio A, the numerical evaluation of A and the scope of its value are:

$\mathrm{A=}\frac{X_{\mathrm{c\; a\; o}}}{X_{{\mathrm{S\; i\; o}}_2}{\mathrm{+X}}_{{\mathrm{Al}}_2{O}_3}}\mathrm{=0.78～1.00}$

After flyash, refractory fibre and lime total amount are determined,, add water glass 0.01%～0.2%, gypsum 2-5%, water 5-8 more by weight percentage doubly, be advisable with 6 times according to total amount.

2, according to its specific manufacturing process of the said ultralight body of claim 1 lagging material be:

One, select materials and get the raw materials ready:

Get CaO content greater than 80% unslaked lime, with 5-8 water yield predigestion in jar doubly of unslaked lime weight, filter in advance, and measure the content of CaO in the filter pulp with the 80-120 mesh sieve; Flyash is levigate to more than 180 orders, and oven dry makes moisture content less than 4%, according to the suitable ratio of components of the said ultralight body of claim 1 lagging material, calculate actual dosage, except that water glass, gypsum, the moisture material that to get ready drops in the gel tank in the lump, and the water content in the lime putty is less than water total amount.The water of deficiency is supplied by calculating.

Two, gelling foaming:

To feed intake mixes intensification, makes a gesture of measuring by material when treating that temperature rises to 100 ℃ to add water glass, terra alba insulated and stirred 30 minutes.

With the colloid of above-mentioned generation gelling, enter foamed pot relaying supervention bubble, blow(ing) pressure must keep 2-4 saturated vapour pressure, and temperature must be higher than 100 ℃, slowly keeps 2-4 hour under the stirring at 3-8 rev/min, enters the compressed moulding operation immediately.

Three, compressed moulding:

For making base substrate level and smooth, to add slick filtered water cover on the model, under 30-50 ton pressure, compression moulding.

Four, steam press maintenance:

During steam press maintenance, slowly heat up earlier, be raised to 6 normal atmosphere in 5 hours, after-acceleration heats up, and is raised to 8 more than the normal atmosphere through 1 hour again, enter constant-voltage phase then, time is 10～14 hours, carries out step-down (cooling) thereupon, and the time was controlled at 5 hours, need after pressure reduces to zero to stop half an hour, drive still and go out goods.

Five, oven dry:

Go out the goods behind the still, through entering the drying shed oven dry, moisture content below 2% promptly packing dispatch from the factory.

3, be that the resulting thin ash with volcano character in combustion back is burnt in the fuel-burning power plant according to employed fine powdered coal in claim 1, the 2 said ultralight body lagging materials, require the weight percentage index of its main chemical to be:

SiO ₂50-70%

Al ₂O ₃15-30%

SiO ₂+ Al ₂O ₃Greater than 75%

Ignition loss is less than 8%

4, according to employed refractory fibre in claim 1, the 2 said ultralight body lagging materials, can be asbestos, refractory fibres such as softening mineral wool.

5, can be forming composition as required according to claim 1,2 said ultralight body lagging materials, also can be the finished product meal.