CN103601475B

CN103601475B - High-aluminum bearing ceramic bar beam and preparation method thereof

Info

Publication number: CN103601475B
Application number: CN201310529368.2A
Authority: CN
Inventors: 罗接发
Original assignee: JIANGXI PINGXIANG LONGFA ENTERPRISE CO Ltd
Current assignee: JIANGXI PINGXIANG LONGFA ENTERPRISE CO Ltd
Priority date: 2013-11-01
Filing date: 2013-11-01
Publication date: 2015-01-28
Anticipated expiration: 2033-11-01
Also published as: CN103601475A

Abstract

The invention discloses a high-aluminum bearing ceramic bar beam and a preparation method thereof. The preparation method is as follows: 64-72wt% of aluminum trioxide, 10-15%wt% of zirconia, 10-15wt% of china clay and 4-6wt% of wollastonite raw material are mixed by ball milling, then Guangdong black mud, carboxymethyl cellulose and water are added for ball milling mixing to prepare a block-shaped mud material, the block-shaped mud material is made into a blank in a stale vacuum mud refining machine, and the blank is coated with a film for nature drying, then is put in a hot air stove for not less than 15 days for drying to have a water content below 0.2%, further is put into a high-temperature shuttle kiln for heating to 600-700 DEG C, is kept warm for 8 to 10 hours, then is heated to 1400 - 1500 DEG C, and is kept warm for 4 to 5 hours for cooling to discharge. The high-aluminum bearing ceramic bar beam has high acid and alkali resistance and corrosion resistance, also has high compressive strength and flexural strength and high opening rate, is suitable for requirements of high gas velocity, reduces the use number of the bar beam, has the characteristics of stability, safety, low resistance, low consumption and uniform distribution in a strong acid medium, and can improve the acid yield by more than 12%, increase the service life by more than 3 years, and reduce the production cost by more than 30%.

Description

High alumina load-bearing ceramic bar beam and preparation method thereof

Technical field

The present invention relates to the bar beam used in a kind of acid industry drying and absorbing tower, especially relate to high alumina load-bearing ceramic bar beam and preparation method thereof.

Background technology

Need to use bar beam to support filler and catalyzer etc. in acid industry drying and absorbing tower, because drying and absorbing tower working conditions is very severe, bar beam not only needs good acid and alkali-resistance, corrosion and resistance to elevated temperatures, and will have higher resistance to compression and folding strength under these conditions.Current bar beam is mostly the elongated strip of more than 1 meter and adopts general ceramic material to make, ceramic bar beam percentage of open area is less, resistance to compression and folding strength low, folding strength is generally at about 150MPa, do not reach the requirement of actual requirement 180 MPa, thus in actual production, easily cause the local damage of bar beam and cause accident to occur, even stopping production, processing thermal stability is low, add maintenance load, reduce production capacity, improve production cost.

Summary of the invention

For the problem existing for the conventional ceramic bar beam that drying and absorbing tower in above-mentioned prior art uses, the invention provides one not only acid and alkali-resistance, corrosion and high temperature resistant, and there is high percentage of open area, ultimate compression strength and folding strength, can production capacity be improved, reduce high alumina load-bearing ceramic bar beam and the preparation method of production cost.

The technical scheme that the technical problem to be solved in the present invention is taked is: the preparation method of high alumina load-bearing ceramic bar beam is:

1, first by the ball milling mixing in proportion of 70-72wt% alchlor, 10-15% wt% zirconium white, 10-15 wt% china clay and 4-6 wt% wollastonite,

2, add the above-mentioned Guangdong black mud of compound weight 3-5 wt% and the carboxymethyl cellulose of 3-5 wt% again, and add suitable quantity of water mixing and ball milling and make cake mass,

3, by old for cake mass more than 10 days, then bar beam base substrate is made in extrusion molding in vacuum deairing machine,

4, bar beam base substrate film coated nature airing is no less than 45 days, makes bar beam base substrate moisture content be less than 5%,

5, again the bar beam base substrate of airing is inserted drying in hotblast stove and is no less than 15 days, make bar beam body drying to moisture content less than 0.2% make work in-process bar beam,

6, again work in-process bar beam is inserted in high-temperature shuttle kiln, after being first heated to 600-700 DEG C, be incubated 8-10 hour, then be warming up to 1400-1500 DEG C of insulation and cool and come out of the stove after 4-5 hour.

In bar beam of the present invention, alchlor content can reach more than 70%, higher than conventional ceramic bar beam alchlor content, thus ultimate compression strength and folding strength can be made greatly to improve, weight-carrying capacity in tower can be increased, acid and alkali-resistance and the corrodibility of bar beam can also be guaranteed simultaneously, acid fastness >=99.8%, bar beam percentage of open area can reach more than 65%.

Technological innovation of the present invention is improving technique formula and process of preparing, by adding alchlor and the Guangdong black mud of high-content, by long apolegamy, determine that composition of raw materials makes pug, extrusion under vacuum is carried out again after pug is old for a long time, and take long-time natural airing and oven dry and zone heating to be incubated the way fired, solve existing strip ceramic bar beam (length is more than 2 meters) physical strength low, strip ceramic bar beam is yielding in preparation process, the in use problem such as easy to crack, guaranteeing under physical strength and thermostability, radical can be arranged by corresponding minimizing bar beam, reduce tower load, not only increase relieving haperacidity production capacity, and saved production cost.

The key technical indexes of the present invention:

Volume density (g/cm3): >=2.3, water-intake rate (%) :≤0.2,

Ultimate compression strength (MPa): >=450, anti-folding (curved) intensity (MPa): >=235,

Acid fastness (%): >=99.8, thermostability (220-20 DEG C): do not split for three times.

Containing the SiO of 46.5% in described china clay ₂with 39.5% Al ₂o ₃.

Described wollastonite major ingredient is CaCO3, wherein SiO ₂content is 51.7%, is a kind of triclinic thin platelike crystal, and it effectively can reduce base substrate and shrink, and reduces base substrate water absorbability, prevents the base substrate later stage from ftractureing, and reduces dissipation loss, accelerates the ripe speed of sintering, anti-low unit article thermal losses.

Described Guangdong black mud has the feature of high viscosity, high whiteness and easily dispersion, and described carboxymethyl cellulose can form full-bodied colloid, has the feature of viscosity, thickening and emulsion dispersion.

Bar beam of the present invention is the long block of 2000 ~ 2100 × 65 × 264mm.

The present invention not only has high acid and alkali-resistance, corrodibility, and there is high ultimate compression strength and folding strength, high percentage of open area, high gas speed requirement can be suitable for, reduce bar beam usage quantity, work in strong acid media and there is all even efficient feature of stability and safety, low-resistance, low consumption, air flow method, acid yield more than 12% can be improved, increase by more than 3 years work-ing life, reduce production cost more than 30%, thus realize high yield and low cost.

Embodiment

Embodiment 1, described high alumina ceramic bar beam is made up of 70wt% alchlor, 13% wt% semi-stability zirconium white, 11 wt% china clay and 6 wt% wollastonite raw materials, and formulated by following processing method;

1, by after above-mentioned raw materials in proportion ball milling mixing, add the above-mentioned Guangdong black mud of compound weight 4 wt% and the carboxymethyl cellulose of 3wt% again, and adding suitable quantity of water (pug has better toughness, becomes the water yield during bulk when hand is rubbed), mixing and ball milling makes cake mass

2, by old for cake mass 13 days, then base substrate is made in extrusion molding in vacuum deairing machine, and controlling working temperature during extruding should below 38 DEG C,

3, by base substrate film coated nature airing 47 days, base substrate moisture content is made to be down to 4.5%,

4, again the base substrate of airing to be inserted in hotblast stove dry 17 days, makes body drying make work in-process to moisture content less than 0.2%,

5, again work in-process are inserted in high-temperature shuttle kiln, after being first heated to 700 DEG C be incubated 8 hours, then be warming up to 1500 DEG C insulation 4 hours cooling come out of the stove.

Embodiment 1 discal patch beam main chemical is:

SiO ₂22.4%，Al ₂O ₃73.5%，K ₂O 1.8%，Na ₂O 0.82%，

CaO 0.85%， MgO 0.14% ， Fe ₂O ₃ 0.39%。

Embodiment 1 discal patch beam the key technical indexes:

Volume density (g/cm3): 2.45, water-intake rate (%): 0.13,

Ultimate compression strength (MPa): 458, folding strength (MPa): 238,

Embodiment 2, described high alumina ceramic bar beam is made up of 72wt% alchlor, 10% wt% semi-stability zirconium white, 13wt% china clay and 5 wt% wollastonite raw materials, and formulated by following processing method;

1, by after above-mentioned raw materials in proportion ball milling mixing, then add the above-mentioned Guangdong black mud of compound weight 3 wt% and the carboxymethyl cellulose of 5wt%, and add suitable quantity of water mixing and ball milling and make cake mass,

2, by old for cake mass 12 days, then base substrate is made in extrusion molding in vacuum deairing machine, and controlling working temperature during extruding should below 38 DEG C,

3, by base substrate film coated nature airing 48 days, base substrate moisture content is made to be down to 4.1%,

4, again the base substrate of airing to be inserted in hotblast stove dry 16 days, makes body drying make work in-process to moisture content less than 0.2%,

5, again work in-process are inserted in high-temperature shuttle kiln, after being first heated to 600 DEG C be incubated 10 hours, then be warming up to 1400 DEG C insulation 5 hours cooling come out of the stove.

Embodiment 2 discal patch beam main chemical is:

SiO ₂20.8%，Al ₂O ₃74.6%，K ₂O 1.7%，Na ₂O 0.72%，

CaO 0.95%， MgO 0.18% ， Fe ₂O ₃ 0.34%。

Embodiment 2 discal patch beam the key technical indexes:

Volume density (g/cm3): 2.41, water-intake rate (%): 0.14,

Ultimate compression strength (MPa): 461, folding strength (MPa): 242,

Claims

1. the preparation method of high alumina load-bearing ceramic bar beam, is characterized in that:

A, first by 70-72wt% alchlor, 10-15wt% zirconium white, 10-15wt% china clay and 4-6 wt% wollastonite in proportion ball milling mixing,

B, add the above-mentioned Guangdong black mud of compound weight 3-5 wt% and the carboxymethyl cellulose of 3-5 wt% again, and add when hand is rubbed and become the water yield mixing and ball milling of bulk to make cake mass,

C, by old for cake mass more than 10 days, then bar beam base substrate was made in extrusion molding in vacuum deairing machine,

D, by bar beam base substrate film coated nature airing be no less than 45 days, make bar beam base substrate moisture content be less than 5%,

E, again the bar beam base substrate of airing is inserted drying in hotblast stove and is no less than 15 days, make bar beam body drying to moisture content less than 0.2% make work in-process bar beam,

F, again work in-process bar beam is inserted in high-temperature shuttle kiln, after being first heated to 600-700 DEG C, be incubated 8-10 hour, then be warming up to 1400-1500 DEG C of insulation and cool after 4-5 hour and come out of the stove.