CN108373278A - A kind of lightening casting material rodlike aggregate and preparation method thereof - Google Patents
A kind of lightening casting material rodlike aggregate and preparation method thereof Download PDFInfo
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- CN108373278A CN108373278A CN201810083098.XA CN201810083098A CN108373278A CN 108373278 A CN108373278 A CN 108373278A CN 201810083098 A CN201810083098 A CN 201810083098A CN 108373278 A CN108373278 A CN 108373278A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
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- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
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Abstract
The invention discloses a kind of lightening casting material rodlike aggregates and preparation method thereof.Using Guangxi white clay, bonding agent and water-reducing agent as raw material, after dry-mixed, water is added to be mixed to get mixed slurry；The rodlike aggregate idiosome of a diameter of 0.6~3mm in basis, then obtains lightening casting material with rodlike aggregate by dry and baking under conditions of obtained mixed slurry by temperature of the vacuum extruder when pressure is 1~2MPa, vacuum degree is 0.085MPa~0.095MPa, is squeezed out is 15~25 DEG C.The preparation method avoids the process for largely preparing mold and not stopping more mold exchange early period, greatly reduce production cost, production efficiency is improved to original 3~5 times, realize continuous automatic production, it is i.e. at low cost, energy consumption less, it is efficient, can mass continuous production, have good economic results in society.
Description
Technical field
The invention belongs to technical field of refractory materials, are related to a kind of lightening casting material rodlike aggregate and preparation method thereof,
More particularly to a kind of lightening casting material aluminium silicon rod shape aggregate and preparation method thereof.
Technical background
So-called light weight castable refractory is to be formulated using light-weight refractory aggregate and powder, bonding agent and additive
, the quality of wherein aglite performance has direct influence to castable performance.Lightening casting material is a kind of high temperature resistant, low body
The unshape refractory of product density, low heat conductivity, while there are many advantages of castable refractory and lightweight refracrory,
It increasingly attracts attention in hot industry.Lightening casting material have bulk density is small, apparent porosity is big, thermal coefficient is low, have
Good heat preservation and insulation, largely reduces thermal losses, improves the service efficiency of Thermal Equipment, improves benefit；Its
Secondary, identical as common castable, technique is simpler, and production cost is low, and production efficiency is high, is burnt using high temperature is not needed preceding
At can avoid by being burnt into consumed mass energy；In addition, can both have been poured into a mould in construction, while can also be made pre-
Product, using it is more convenient the advantages that.It is widely used in the industries such as steel, metallurgy, cement.
Aglite is one of the important component of lightweight unshape refractory, mainly plays skeleton function；Lightweight aggregate
It is the chief component in light weight castable refractory, proportion is larger (50wt% or so), therefore lightweight aggregate performance is good and bad
It is affected for light weight castable refractory overall performance, finally determines every usability of lightweight unshape refractory
Energy.
Preparing the common method of lightening casting material aggregate has mechanical pressing, moulding by casting etc. at present；In these preparation sides
Can not prepare the small-sized particles of aggregates of specific shape in method, and size particles of aggregates bigger than normal be unable to get it is qualified
Therefore the small size aggregate and performance of function admirable can not be prepared in lightening casting material under conditions of existing preparation method
Excellent lightening casting material.The particles of aggregates that is prepared in mechanical pressing preparation process is larger, and (minimum diameter is 20~30mm's
Block), and the bulky grain of preparation is crushed by the smaller particle needs of grain size after firing in order to obtain, in shattering process
In be unable to control particle pattern and broken obtained particle it is very uneven (and there are multiple sharp corner angle)；Moulding by casting
Preparation process in, the forming of the too small aggregate of size is also relatively difficult, and needs during moulding by casting using independent
Mold be molded preparation one by one, water requirement is big, blank strength is low, prepare forming after demould when it is fragile, lead to the qualification of finished product
Rate is low, causes the waste of mold raw material and product raw material；The whole process produced one by one by mold is discontinuity, Wu Fashi
Existing consecutive production；One set of die is generally used only once, in discontinuity production process will continuous more mold exchange, not only
Considerably increase the manufacturing cost of mold, it is also difficult to realize that automated production, needs manually constantly carry out dismounting arrangement, it is entire to make
The set-up time of mold is far longer than the preparation time of aggregate sample during standby, time-consuming, laborious, production cost is high, is difficult to reality
Existing automatic continuous production.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of rodlike aggregate processing method of light weight castable refractory,
With Guangxi white clay etc. for raw material, the aglite of specific shape, easy to operate, Neng Goushi are prepared using the method for vacuum press
Existing automatic continuous production, production efficiency is high, at low cost, high yield rate, utilizes negative pressure that can remove during vacuum press
The air of inside pug so that the molding idiosome intensity of preparation is high；And the aggregate has excellent volume stability and thermal shock
Stability.The present invention solves by the following technical programs
A kind of rodlike aggregate processing method of lightening casting material, this approach includes the following steps：
(1) raw material needed for preparing：Guangxi white clay, bonding agent, water-reducing agent；
(2) raw material Guangxi white clay, the weight percent of bonding agent and water-reducing agent as requested prepared step (1) is added
It is mixed in blender and obtains mixture；
(3) water is added in the weight ratio in the mixture that step (2) obtains as requested, is mixed evenly, is mixed
Close slurry；
(4) mixed slurry that step (3) obtains is added to by the charge door of vacuum extruder in vacuum extruder and is carried out
It squeezes, obtains the rodlike aggregate product of a diameter of 0.6~3mm；During being somebody's turn to do, placing aperture in vacuum extruder exit is
The template of 0.6~3mm, you can obtain required rodlike aggregate product；
(5) rod-shaped products that step (4) obtains are cut to the rodlike aggregate idiosome of certain length, be then dried,
Baking is handled, and is cooled to room temperature after the completion of baking processing and is obtained the aggregate.
The rodlike aggregate processing method of the lightening casting material, the Guangxi white clay described in step (2) and subtract bonding agent
The weight percent of aqua is as follows：
Guangxi white clay：75~95%
Bonding agent：5~25%
The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.1~1%.
The rodlike aggregate processing method of the lightening casting material, the dosage of the water-reducing agent account for Guangxi white clay and combination
The percentage of agent total weight is 0.5~1%.
The granularity of the rodlike aggregate processing method of the lightening casting material, the Guangxi white clay is≤45 μm.
The rodlike aggregate processing method of the lightening casting material, the bonding agent be alumina cement, waterglass and
Any one of calcium lignosulfonate is appointed several；The water-reducing agent is hydroxymethyl cellulose, sodium tripolyphosphate, hexa metaphosphoric acid
Any one of sodium and FDN high efficiency water reducing agents are appointed several.The granularity of the alumina cement is：The quality hundred of granularity≤45 μm
Divide ratio >=85%.
The addition of the rodlike aggregate processing method of the lightening casting material, step (3) described water is step (2) institute
The 10~20% of obtained mixture total weight.
The rodlike aggregate processing method of the lightening casting material, step (4) described mixed slurry is by vacuum extruder
Pressure when extrusion is 1~2MPa, and vacuum degree is -0.085MPa~-0.095MPa, and temperature when extrusion is 15~25 DEG C.
The rodlike aggregate processing method of the lightening casting material, described in step (5) for rodlike aggregate idiosome
Drying, baking concrete operations are as follows：The rodlike aggregate idiosome of preparation is dried into 45~50h under the conditions of 25 ± 5 DEG C；It is dry to complete
5~7h is toasted under the conditions of 40 ± 5 DEG C afterwards；The temperature in stove is warming up to 170 ± 5 DEG C by 40 ± 5 DEG C after the completion of baking, and
9~11h is kept the temperature at this temperature；After the completion of heat preservation, in-furnace temperature is warming up to 1200 ± 10 DEG C by 170 ± 5 DEG C, and at such a temperature
Keep the temperature 9~11h；After the completion of heat preservation, stop heating, cooled to room temperature (can stop heating, dry after the completion of heat preservation
Cooled to room temperature under conditions of equipment is still closed).
The rodlike aggregate processing method of the lightening casting material, the temperature described in step (5) are warming up to by 40 ± 5 DEG C
170 ± 5 DEG C of heating rate is 20 DEG C/min；The heating rate that the temperature is warming up to 1200 DEG C ± 10 DEG C by 170 ± 5 DEG C
For 5 DEG C/min.
The length of the rodlike aggregate processing method of the lightening casting material, step (5) the rodlike aggregate idiosome is
20~30mm (length of the lightening casting material aggregate obtained is 20~30mm).
The rodlike aggregate of lightening casting material prepared by the above method.
In the present invention based on the white clay of Guangxi ingredient, have the idiosome of preparation under the conditions of existing for bonding agent preferable
Intensity, the shape of aggregate itself can be maintained, idiosome intensity has been turned up under the conditions of existing for additive, it is thick to increase fluid
Degree；Then the intensity for removing the gas in idiosome by suction function in vacuum extruder, further increasing idiosome, and
Automatic continuous production can be realized, without preparing many molds, ceaselessly using mold instead in preparation process and waste a large amount of
Time, and expend a large amount of manpower and materials.
Compared with prior art, the present invention has following positive beneficial effect
The present invention can prepare the rodlike of microsize using vacuum extruder by the control in aperture above extrusion die
Aggregate need not take a substantial amount of time, human and material resources can prepare various sizes of rodlike aggregate (size reaches millimeter
Rank, aggregate that diameter is smaller)；The extruder size of control aggregate is carried out by vacuum extruder and outlet template,
It round-the-clock can squeeze out, be not necessarily to ceaselessly more mold exchange and ceaselessly charging and demoulding, preferably realize continuously automatically
Metaplasia is produced, and production cost is greatly reduced.Reduce the lot of materials expended by the preparation of multiple molds, human and material resources,
The plenty of time for reducing since more mold exchange expends, (replacement of mold and set-up time were far longer than aggregate in existing preparation
Preparation time).Production efficiency is substantially increased, production efficiency is higher than original 3~5 times；
In the production process of aggregate of the present invention, it is not related to the dismounting of mold, takes out the replacement of product, mold in mould
Journey avoids the damage caused by idiosome in knockout course, improves yield rate.It is molded in product idiosome leisure vacuum extruder
After be directly entered drying, baking program in, do not influenced by external force, high yield rate；
Aggregate of the present invention eliminates air present in idiosome during vacuum extruding by negative pressure of vacuum, compared with
The intensity for improving idiosome of big degree；Air in idiosome also avoids occurring that sintering shrinkage is big, leads to intensity after excluding
The rodlike aggregate of low and poor thermal shock resistance problem, preparation has excellent volume stability and thermal shock resistance, therefore adopts
The lightening casting material prepared with rodlike aggregate of the present invention has excellent thermal shock resistance；
The rodlike aggregate idiosome high yield rate of small size and performance prepared is good, it is at low cost, energy consumption less, it is efficient, can
It realizes mass continuous production, there are good economic results in society.
Description of the drawings
Fig. 1 is the vacuum extruder schematic diagram used in the present invention；
Fig. 2 is the structural schematic diagram of template employed in extrusion；
Template with special diameter circular hole is placed in the exit of vacuum extruder, by vacuum extruder charge door
Mixed slurry after addition is squeezed out by the outlet of vacuum extruder by the hole above template, obtains rodlike aggregate idiosome.
Specific implementation mode
The present invention is described in more details below by specific implementation mode, but is not intended to restrict the invention
Protection domain.
Embodiment 1
A kind of rodlike aggregate of lightening casting material, the aggregate are prepared by the raw material of following weight percent：
The Guangxi white clay that granularity is≤45 μm：75%
Alumina cement：10%
Waterglass：10%
Wooden calcium sulfonate：5%
The additional hydroxymethyl cellulose for accounting for above-mentioned raw materials total weight 0.2%, the calgon for accounting for above-mentioned raw materials 0.5%.
The rodlike aggregate processing method, includes the following steps：
(1) prepare raw material as requested：The Guangxi white clay 75% that granularity is≤45 μm, alumina cement 10%, waterglass
10%, wooden calcium sulfonate 5%；And sodium cellulose glycolate and calgon；
(2) usage percentage of step (1) ready raw material as requested is added in planetary stirring machine and is carried out
It is mixed, stirs evenly, obtain mixture；
(3) water for accounting for mixture total weight 10% is added in the mixture described in step (2), stirs evenly, is mixed
Close slurry；
(4) start vacuum extruder, the mixed slurry that step (3) obtains is added to very by the charge door of vacuum extruder
It is squeezed out in empty extruder, pressure is 1~2MPa, vacuum degree -0.085MPa~-0.095MPa, temperature are 15~25 DEG C
Under the conditions of squeeze out, obtain the rodlike aggregate product of a diameter of 0.6mm by extruding；
(5) the rodlike aggregate product that step (4) obtains is cut to the rodlike aggregate idiosome that length is 30mm, then should
Rodlike aggregate idiosome carries out following dry, baking operation：
The rodlike aggregate idiosome that length is 30mm is placed on sheet metal first, then will be placed with rodlike aggregate idiosome
Sheet metal be placed in industrial furnace dry 45h under the conditions of 25 ± 5 DEG C；It is dried under the conditions of 40 ± 5 DEG C after the completion of drying
Roasting 5h；After the completion of baking, temperature is warming up to 170 ± 5 DEG C by 40 ± 5 DEG C under conditions of heating rate is 20 DEG C/min, so
Keep the temperature 9h at such a temperature afterwards；After the completion of heat preservation, temperature is heated up by 170 ± 5 DEG C under conditions of heating rate is 5 DEG C/min
To 1200 DEG C, 9h is then kept the temperature at such a temperature；After the completion of heat preservation, stopping heating, rod-shaped products are naturally cold in industrial furnace
But to room temperature to get to lightening casting material of the present invention aluminium silicon rod shape aggregate.
Embodiment 2
A kind of rodlike aggregate of lightening casting material, the aggregate are prepared by the raw material of following weight percent：
The Guangxi white clay that granularity is≤45 μm：95%
Waterglass：3%
Wooden calcium sulfonate：2%
The additional sodium tripolyphosphate for accounting for above-mentioned raw materials total weight 0.2%, the hexa metaphosphoric acid for accounting for above-mentioned raw materials total weight 0.4%
Sodium, the FDN for accounting for above-mentioned raw materials 0.2%.
The rodlike aggregate processing method, includes the following steps：
(1) prepare raw material as requested：The Guangxi white clay 95% that granularity is≤45 μm, waterglass 3%, wooden calcium sulfonate
2%；And sodium tripolyphosphate, calgon and FDN；
(2) usage percentage of step (1) ready raw material as requested is added in planetary stirring machine and is carried out
It is mixed, stirs evenly, obtain mixture；
(3) water for accounting for mixture total weight 20% is added in step (2) the obtained mixture, stirs evenly, obtains
To mixed slurry；；
(4) mixed slurry that step (3) obtains is added to by the charge door of vacuum extruder in vacuum extruder and is carried out
It squeezes out, is squeezed out under the conditions of pressure is 1~2MPa, vacuum degree -0.085MPa~-0.095MPa, temperature are 15~25 DEG C,
The rodlike aggregate product of a diameter of 3mm is obtained by extruding；
(5) rod-shaped products that step (4) obtains are cut to the rodlike aggregate idiosome that length is 20mm, it is then that this is rodlike
Aggregate idiosome carries out following dry, baking operation：
The rodlike aggregate idiosome that length is 20mm is placed on sheet metal first, then will be placed with rodlike aggregate idiosome
Sheet metal be placed in industrial furnace, dry 50h under the conditions of 25 ± 5 DEG C；It is toasted under the conditions of 40 ± 5 DEG C after the completion of drying
7h；After the completion of baking, temperature is warming up to 170 ± 5 DEG C by 40 ± 5 DEG C under conditions of heating rate is 20 DEG C/min, then
11h is kept the temperature at such a temperature；After the completion of heat preservation, temperature is heated up by 170 ± 5 DEG C under conditions of heating rate is 5 DEG C/min
To 1200 DEG C, 11h is then kept the temperature at such a temperature；After the completion of heat preservation, stop heating, rodlike aggregate idiosome in industrial furnace from
It is so cooled to room temperature to get to lightening casting material aluminium silicon rod shape aggregate of the present invention.
Embodiment 3
A kind of rodlike aggregate of lightening casting material, the aggregate are prepared by the raw material of following weight percent：
The Guangxi white clay that granularity is≤45 μm：85%
Waterglass：10%
Wooden calcium sulfonate：5%
The additional sodium cellulose glycolate for accounting for above-mentioned raw materials total weight 0.2%.
The rodlike aggregate processing method, includes the following steps：
(1) prepare raw material as requested：The Guangxi white clay 85% that granularity is≤45 μm, waterglass 10%, wooden calcium sulfonate
5%；And sodium cellulose glycolate；
(2) amount ratio of step (1) ready raw material as requested is added in planetary stirring machine and is mixed
Stirring, stirs evenly, obtains mixture；
(3) water for accounting for mixture total weight 15% is added in the mixture described in step (2), stirs evenly, is mixed
Close slurry；
(4) mixed slurry that step (3) obtains is added to by the charge door of vacuum extruder in vacuum extruder and is carried out
It squeezes out, is squeezed out under the conditions of pressure is 1~2MPa, vacuum degree -0.085MPa~-0.095MPa, temperature are 15~25 DEG C,
The rodlike aggregate product of a diameter of 1.5mm is obtained by extruding；
(5) rod-shaped products that step (4) obtains are cut to the rodlike aggregate idiosome that length is 25mm, it is then that this is rodlike
Aggregate idiosome carries out following dry, baking operation：
The rodlike aggregate idiosome that length is 25mm is placed on sheet metal first, then will be placed with rodlike aggregate idiosome
Sheet metal be placed in industrial furnace, dry 48h under the conditions of 25 ± 5 DEG C；It is dried under the conditions of 40 ± 5 DEG C after the completion of drying
Roasting 6h；After the completion of baking, temperature is warming up to 170 ± 5 DEG C by 40 ± 5 DEG C under conditions of heating rate is 20 DEG C/min, so
Keep the temperature 10h at such a temperature afterwards；After the completion of heat preservation, temperature is risen by 170 ± 5 DEG C under conditions of heating rate is 5 DEG C/min
Then temperature keeps the temperature 10h at such a temperature to 1200 DEG C；After the completion of heat preservation, stop heating, rodlike aggregate idiosome in industrial furnace
Cooled to room temperature is to get to lightening casting material of the present invention aluminium silicon rod shape aggregate.
Embodiment 4
A kind of rodlike aggregate of lightening casting material, the aggregate are prepared by the raw material of following weight percent：
The Guangxi white clay that granularity is≤45 μm：94%
Waterglass：4%
Wooden calcium sulfonate：2%
The additional sodium tripolyphosphate for accounting for above-mentioned raw materials total weight 0.2%, the hexa metaphosphoric acid for accounting for above-mentioned raw materials total weight 0.2%
Sodium, the hydroxymethyl cellulose for accounting for above-mentioned raw materials total weight 0.5%.
The rodlike aggregate processing method, includes the following steps：
(1) prepare raw material as requested：The Guangxi white clay 94% that granularity is≤45 μm, waterglass：4%, wooden calcium sulfonate：
2%；And sodium tripolyphosphate, calgon and hydroxymethyl cellulose；
(2) amount ratio of step (1) ready raw material as requested is added in planetary stirring machine and is mixed
Stirring, stirs evenly, obtains mixture；
(3) water for accounting for mixture total weight 15% is added in the mixture described in step (2), stirs evenly, is mixed
Close slurry；
(4) mixed slurry that step (3) obtains is added to by the charge door of vacuum extruder in vacuum extruder and is carried out
It squeezes out, is squeezed out under the conditions of pressure is 1~2MPa, vacuum degree -0.085MPa~-0.095MPa, temperature are 15~25 DEG C,
The rodlike aggregate product of a diameter of 1.5mm is obtained by extruding；
(5) rod-shaped products that step (4) obtains are cut to the rodlike aggregate idiosome that length is 25mm, it is then that this is rodlike
Aggregate idiosome carries out following dry, baking operation：
The rodlike aggregate idiosome that length is 25mm is placed on sheet metal first, then will be placed with rodlike aggregate idiosome
Sheet metal be placed in industrial furnace, dry 48h under the conditions of 25 ± 5 DEG C；It is dried under the conditions of 40 ± 5 DEG C after the completion of drying
Roasting 6h；After the completion of baking, temperature is warming up to 170 ± 5 DEG C by 40 ± 5 DEG C under conditions of heating rate is 20 DEG C/min, so
Keep the temperature 10h at such a temperature afterwards；After the completion of heat preservation, temperature is risen by 170 ± 5 DEG C under conditions of heating rate is 5 DEG C/min
Then temperature keeps the temperature 10h at such a temperature to 1200 DEG C；After the completion of heat preservation, stop heating, rodlike aggregate idiosome in industrial furnace
Cooled to room temperature is to get to lightening casting material of the present invention aluminium silicon rod shape aggregate.
Performance detection is carried out with rodlike aggregate to the lightening casting material prepared using the above method, it is as a result as follows：
The ingredient of the rodlike aggregate of gained is：Clayey：Al2O3>=35%, Fe2O3≤ 1%；
The flexural strength index of rodlike aggregate：≥1MPa；
Refractoriness >=1700 DEG C of rodlike aggregate.
Claims (10)
1. a kind of rodlike aggregate processing method of lightening casting material, which is characterized in that this approach includes the following steps：
(1) raw material needed for preparing：Guangxi white clay, bonding agent and water-reducing agent；
(2) the Guangxi white clay for preparing step (1), the weight percent of bonding agent and water-reducing agent as requested are added in blender
Mixing obtains mixture；
(3) water is added in the weight percent in the mixture that step (2) obtains as requested, is mixed evenly, is mixed
Close slurry；
(4) mixed slurry that step (3) obtains is placed in vacuum extruder and is squeezed out, obtain the stick of a diameter of 0.6~3mm
Shape product；
(5) rod-shaped products that step (4) obtains are dried, baking processing, are cooled to room temperature after the completion of baking and obtain institute
The lightening casting material aggregate stated.
2. the rodlike aggregate processing method of lightening casting material according to claim 1, which is characterized in that step (2) institute
State Guangxi white clay, the weight percent of bonding agent and water-reducing agent is as follows：
Guangxi white clay：75~95%；
Bonding agent：5~25%
The additional water-reducing agent for accounting for above-mentioned raw materials total weight 0.1~1%.
3. the rodlike aggregate processing method of lightening casting material according to claim 1 or 2, which is characterized in that described wide
The granularity of western white clay is≤45 μm.
4. the rodlike aggregate processing method of lightening casting material according to claim 1 or 2, which is characterized in that described
Bonding agent is any one of alumina cement, waterglass and wooden calcium sulfonate or appoints several；The water-reducing agent is that methylol is fine
It ties up any one of element, sodium tripolyphosphate, calgon and FDN or appoints several.
5. the rodlike aggregate processing method of lightening casting material according to claim 1, which is characterized in that step (3) institute
The addition for stating water is 10~20% of mixture total weight obtained by step (2).
6. the rodlike aggregate processing method of lightening casting material according to claim 1, which is characterized in that step (4) institute
It is 1~2MPa to state pressure when mixed slurry is squeezed out by vacuum extruder, and vacuum degree is -0.085MPa~-0.095MPa, is squeezed out
When temperature be 15~25 DEG C.
7. the rodlike aggregate processing method of lightening casting material according to claim 1, which is characterized in that step (5) institute
The specific behaviour of drying, baking stated for rod-shaped products is as follows：By the rod-shaped products of preparation dry 45 under the conditions of 25 ± 5 DEG C~
50h；5~7h is toasted after the completion of drying under the conditions of 40 ± 5 DEG C；Temperature is warming up to 170 ± 5 by 40 ± 5 DEG C after the completion of baking
DEG C, and 9~11h is kept the temperature at such a temperature；After the completion of heat preservation, temperature is warming up to 1200 ± 10 DEG C by 170 ± 5 DEG C, and in the temperature
Degree is lower to keep the temperature 9~11h；After the completion of heat preservation, it is cooled to room temperature.
8. the rodlike aggregate processing method of lightening casting material according to claim 7, which is characterized in that the temperature
The heating rate for being warming up to 170 ± 5 DEG C by 40 ± 5 DEG C is 20 DEG C/min；Temperature is warming up to 1200 ± 10 DEG C by 170 ± 5 DEG C
Heating rate is 5 DEG C/min.
9. the rodlike aggregate processing method of lightening casting material according to claim 1, which is characterized in that step (5) institute
The length for the lightening casting material aggregate stated is 20~30mm.
10. the rodlike aggregate of lightening casting material prepared by a kind of claim 1.
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