CN113233908A

CN113233908A - Regenerated carbon-free brick and preparation method thereof

Info

Publication number: CN113233908A
Application number: CN202110744717.7A
Authority: CN
Inventors: 易玉来; 唐安山; 曾立民; 陶进; 蒋猛; 曹枝文
Original assignee: Hunan Xianggang Ruitai Technology Co ltd
Current assignee: Hunan Xianggang Ruitai Technology Co ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-08-10

Abstract

The invention provides a regenerative carbon-free brick and a preparation method thereof. The regenerative carbon-free brick provided by the invention is prepared from raw materials; the raw materials comprise a base material and additives; the base material comprises the following components: 40-60 wt% of outer ring castable reclaimed material; 10-45 wt% of plate-shaped corundum particles; 10 wt% -20 wt% of premix; the additive comprises the following components in percentage by mass of the base material: 5-7 wt% of a bonding agent; 2-5 wt% of water; wherein, the premix comprises: aluminum powder, silicon carbide powder, white corundum, active alumina micro powder and silicon micro powder. The invention replaces the original raw material with 40 wt% -60 wt% of the outer ring castable reclaimed material, matches with the plate-shaped corundum, the premix compound with a certain composition, the bonding agent and the water in a certain proportion, compared with the original material carbon-free brick, can ensure the service performance, has the comprehensive performance higher than that of the existing magnesia-chrome brick product, and reduces the production cost.

Description

Regenerated carbon-free brick and preparation method thereof

Technical Field

The invention relates to the field of inorganic materials, in particular to a regenerated carbon-free brick and a preparation method thereof.

Background

The carbon brick is a high-temperature resistant neutral refractory material product prepared by adding a proper amount of bonding agent into a carbonaceous material serving as a raw material, and is used for building the bottom and the waist of a blast furnace, such as the bottom or the lining of a steel furnace in a steel plant.

With the development of the steel industry, the requirements for variety steel and clean steel are higher and higher. Because the carbon-containing bricks can be carburized in the using process, clean steel pollution is caused, and the requirements of steelmaking are not met; the heat conductivity coefficient of the carbon-containing brick is as high as 10W/m.degree C, which is far higher than that of the castable by 1-1.5W/m.degree C, the heat loss of the steel ladle is huge, and the energy consumption is high; the carbon-containing brick contains 8-16% of graphite, resin is used as a curing agent, and the production, construction and waste discharge all pollute the environment and are not friendly to the environment. Therefore, steel mills require vigorous popularization and use of the carbon-free bricks due to the influence of factors such as the process.

At present, all carbon-free bricks are raw materials, so that the cost is high, and the large-scale production application can cause the production cost of enterprises to be overhigh.

Disclosure of Invention

In view of the above, the present invention aims to provide a recycled carbon-free brick and a preparation method thereof. The regenerative carbon-free brick provided by the invention can greatly reduce the cost on the basis of ensuring the use effect.

The invention provides a regenerative carbon-free brick, which is prepared from raw materials;

the raw materials comprise a base material and additives;

the base material comprises the following components:

40-60 wt% of outer ring castable reclaimed material;

10-45 wt% of plate-shaped corundum particles;

10 wt% -20 wt% of premix;

the additive comprises the following components in percentage by mass of the base material:

5-7 wt% of a bonding agent;

2-5 wt% of water;

wherein the premix comprises: aluminum powder, silicon carbide powder, white corundum, active alumina micro powder and silicon micro powder.

Preferably, the outer ring castable reclaimed material comprises the following powder with the particle size distribution:

8 to 20 weight percent of particles with the particle size of more than 3mm and less than or equal to 5 mm;

15-30 wt% of particles with the particle size of more than 1mm and less than or equal to 3 mm;

10 to 15 weight percent of particles with the particle size of more than 0mm and less than or equal to 1 mm.

Preferably, the plate-shaped corundum particles comprise powders with the following particle size distribution:

0 to 10 weight percent of particles with the particle size of more than 3mm and less than or equal to 5 mm;

5 to 15 weight percent of particles with the particle size of more than 1mm and less than or equal to 3 mm;

5 to 20 weight percent of particles with the particle size of more than 0mm and less than or equal to 1 mm.

Preferably, the binding agent is a complex magnesium-aluminum binding agent;

the complex magnesium-aluminum binding agent comprises: MgO 45-48 wt%, Al₂O₃43 to 46 percent by weight, and the balance of inevitable impurities.

Preferably, the complex magnesium-aluminum binder is MaCaR-46M.

Preferably, the mass ratio of each component in the premix is as follows:

preferably, the fineness of the aluminum powder is 180-200 meshes;

the particle size of the silicon carbide powder is 0-0.088 mm;

the granularity of the white corundum is 0-0.045 mm;

the particle size of the active alumina micro powder is 0-5 mu m;

the particle size of the silicon micro powder is 0-5 mu m.

Preferably, the silicon carbide powder is 97 silicon carbide powder;

the silicon micropowder is 96 silicon micropowder.

The invention also provides a preparation method of the regenerated carbon-free brick in the technical scheme, which comprises the following steps:

a) mixing the outer ring castable reclaimed material, the plate-shaped corundum particles, the premix, the bonding agent and water to obtain a mixture;

b) striking and forming the mixture by using a ton press to obtain a regenerated carbon-free brick green body;

c) and naturally drying the green bricks of the regenerated carbon-free bricks, and then heating and baking to obtain the regenerated carbon-free bricks.

Preferably, in the step b), the striking is formed by: 16 hits at a 630 ton press;

in the step c):

the natural drying time is 1 day;

the heating and baking temperature schedule is as follows: firstly heating to 80 ℃ and preserving heat for 2h, then heating to 150 ℃ and preserving heat for 2h, and continuously heating to 220 ℃ and preserving heat for 6 h.

The regenerative carbon-free brick provided by the invention replaces the original raw material with 40-60 wt% of regenerative material (namely the outer ring castable regenerative material), matches the outer ring castable regenerative material with certain particle grading and the plate-shaped corundum particles, and combines with the premix, the specific binding agent and the water which are formed in a certain proportion.

Experimental results show that the high-temperature performance of the regenerative carbon-free brick provided by the invention is as follows: compressive strength of 140MPa or more, apparent porosity of 18% or less, and bulk density of 2.88g/cm³The above.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of the structure of an RH device;

FIG. 2 is a schematic view of the structure of the RH insertion tube.

Detailed Description

The invention provides a regenerative carbon-free brick which is prepared from the following raw materials:

the raw materials comprise a base material and additives;

the base material comprises the following components:

40-60 wt% of outer ring castable reclaimed material;

10-45 wt% of plate-shaped corundum particles;

10 wt% -20 wt% of premix;

5-7 wt% of a bonding agent;

2-5 wt% of water;

The invention replaces the original raw material with 40 wt% -60 wt% of the reclaimed material (namely the outer ring castable reclaimed material), matches with the plate-shaped corundum, the premix compound with a certain composition, the bonding agent and the water in a certain proportion, compared with the original material carbon-free brick, the invention can ensure the service performance, the comprehensive performance is higher than that of the existing magnesia-chrome brick product, and the reclaimed material replaces the original raw material, thereby greatly reducing the production cost.

In the invention, the outer ring castable reclaimed material is formed by reprocessing recycled waste carbon-free bricks. The RH (for steel mill refining) device is provided with an insert pipe (comprising an ascending pipe and a descending pipe), the inner part (inner ring) of the insert pipe is bricked, and the outer ring is made of casting materials such as corundum and the like, which are called as outer ring casting materials, namely the casting materials of the outer ring of the RH insert pipe. Referring to fig. 1, fig. 1 is a schematic structural diagram of an RH device, in which 1 is a vacuum chamber, 2-3 are insertion tubes (2 is an ascending tube and 3 is a descending tube), 4 is a ladle, 5 is an argon blowing tube, 6 is an exhaust tube, 7 is an alloy bin, and 8 is a peephole. Taking the insertion tube 3 as an example, the structure is shown in fig. 2, and fig. 2 is a schematic structural diagram of the RH insertion tube, wherein 3a is inner ring brickwork and 3b is outer ring castable.

Before the RH device is used, the outer ring thickness of the RH insert tube is generally about 12cm, and after the RH device is used, because molten steel is corroded, an outer ring castable with the thickness of about 4-6cm is remained.

In the invention, the mode of regenerating the used outer ring castable of the RH inserting pipe to form the regenerated material is as follows: the outer ring castable without steel slag and impurities is selected from the outer ring castable, baked and then graded and crushed to obtain the required graded reclaimed material. Wherein the baking temperature is preferably 200-250 ℃; the baking time is preferably 8-10 h.

In the invention, the total amount of the outer ring castable reclaimed material is 40-60 wt%; in some embodiments of the invention, the amount is 40 wt%, 56 wt%, or 60 wt%. The outer ring castable reclaimed material is formed by grading particles with different granularities, and comprises the following powder with the following granularity distribution in terms of the mass ratio of the particles with various granularities in the integrally regenerated carbon-free brick raw material:

In some embodiments of the invention, the particle distribution is: 8 wt% of particles with the size of 3-5 mm, 18 wt% of particles with the size of 1-3 mm and 14 wt% of particles with the size of 0-1 mm; or 18 wt% of particles with the size of 3-5 mm, 20 wt% of particles with the size of 1-3 mm and 18 wt% of particles with the size of 0-1 mm; or 18 wt% of particles with the size of 3-5 mm, 28 wt% of particles with the size of 1-3 mm and 14 wt% of particles with the size of 0-1 mm.

In the invention, the usage amount of the tabular corundum particles is 10-45 wt%; in some embodiments of the invention, the tabular corundum particles are used in an amount of 40 wt%, 28 wt% or 25 wt%. The plate-shaped corundum particles consist of powder materials with different granularities, and the plate-shaped corundum particles comprise the powder materials with the following granularity distribution according to the mass ratio of various granularity particles in the integrally regenerated carbon-free brick raw material:

0 to 10 weight percent of particles with the particle size of more than 3mm and less than or equal to 5 mm; preferably not endpoint 0;

In the present invention, the premix comprises: aluminum powder, silicon carbide powder, white corundum, active alumina micro powder and silicon micro powder.

Wherein:

the fineness distribution of the aluminum powder is preferably 180-200 meshes, wherein the mass ratio of the aluminum powder with the fineness less than 200 meshes to the whole aluminum powder is more than 96 wt%.

The silicon carbide powder is preferably 97 silicon carbide powder. The particle size distribution of the silicon carbide powder is preferably 0-0.088 mm (the end point is not included, namely the particle size is larger than 0mm), wherein the mass ratio of the silicon carbide powder with the particle size smaller than 0.074mm to the whole silicon carbide powder is larger than 95 wt%.

The particle size distribution of the white corundum is preferably 0-0.045 mm (the end point is not included, namely the particle size is larger than 0mm), wherein the mass ratio of the white corundum with the particle size smaller than 0.045mm to the whole white corundum is larger than 98 wt%.

The particle size distribution of the activated alumina micro powder is preferably 0-5 mu m (the end point is not included, namely the particle size is more than 0 mu m), wherein the mass ratio of the activated alumina micro powder with the particle size of less than 5 mu m to the whole activated alumina micro powder is more than 98 wt%.

The fine silica powder is preferably 96 fine silica powder. The particle size distribution of the silicon micropowder is preferably 0-5 mu m (the end point is not included, namely the particle size is more than 0 mu m), wherein the mass ratio of the silicon micropowder with the particle size of less than 5 mu m to the whole silicon micropowder is more than 98 wt%.

In the invention, the dosage of the premix is 10-20 wt%; in some embodiments of the invention, the premix is used in an amount of 20 wt% or 16 wt%. The mass ratio of each component in the whole regeneration carbon-free brick raw material is preferably as follows:

in the invention, the premix is prepared by the following steps: mixing aluminum powder, silicon carbide powder, white corundum, active alumina micro powder and silicon micro powder to form the premix. The mixing can be carried out in a premixer, and the mixing time is preferably more than 30min, so that the materials are fully and uniformly mixed. For example, 1 ton of the components are mixed according to the proportion and are all poured into a premixer, the premixer is started to mix for at least 30min, all the components are fully and uniformly distributed to form uniformly mixed premix, and then the premix is put into use.

In the invention, the raw materials comprise additives (bonding agent and water) besides the base materials (namely the outer ring castable reclaimed material, the plate corundum particles and the premix).

In the invention, the binding agent is a complex magnesium-aluminum binding agent. The complex magnesium aluminum binder preferably comprises: MgO 45-48 wt%, Al₂O₃43 to 46 percent by weight, and the balance of inevitable impurities. The source of the complexing magnesium-aluminum binding agent is not particularly limited, and the complexing magnesium-aluminum binding agent is a general commercial product. In some embodiments of the invention, the complex magnesium aluminum binder is macal-46M. In the material system of the invention, the specific complexing magnesium-aluminum binding agent can be well matched with other components, so that the performances of the carbon-free brick product such as porosity, volume density, linear variation, compressive strength and the like can reach the best, and the other binding agents can cause the integral performance of the product to be deficient.

In the invention, the base material is used as a reference, and the dosage of the bonding agent accounts for 5-7 wt% of the mass ratio of the base material. The product can keep better high-temperature strength under the dosage. In some embodiments of the invention, the amount of the binder is 5.4 wt%, 6 wt%, or 7 wt%.

In the invention, the base material is used as a reference, and the water accounts for 2-5 wt% of the base material. The requirement of the water is not particularly limited, and domestic water can be directly used. In some embodiments of the invention, the water is used in an amount of 2.7 wt%, 3.4 wt%, or 4 wt%.

The regenerative carbon-free brick provided by the invention is prepared by matching the outer ring castable reclaimed material with specific particle grading and plate-shaped corundum particles, adopts a certain premix (aluminum powder, silicon carbide powder, white corundum, activated alumina micropowder and silica micropowder), a specific binding agent and water as raw materials, and adopts 40-60 wt% of the outer ring castable reclaimed material to replace the original raw material, so that the production cost is greatly reduced, and the performance of the integral regenerative carbon-free brick product is ensured through the matching effect with other materials, namely, the production cost is greatly reduced on the basis of not weakening the product performance.

With respect to step a):

the types, the use amounts and the like of the outer ring castable reclaimed material, the plate-shaped corundum particles, the premix, the bonding agent, the water and the like are consistent with those in the technical scheme, and are not repeated here.

The mixing may be performed in a sand mixer. In some embodiments of the invention, a type 800 forced mixer is employed. In the present invention, the order of mixing is preferably: the outer ring castable reclaimed material and the plate-shaped corundum particles are stirred and mixed, then water is added for mixing and grinding, and finally the bonding agent and the premix are added for mixing and grinding. More specifically, the outer ring castable reclaimed material and the plate-shaped corundum particles are stirred and mixed for 2min, then water is added for mixing and grinding for 2min, finally, the bonding agent and the premix are added for mixing and grinding for 15-20 min, and discharging is carried out to obtain a mixture.

With respect to step b):

in the present invention, the ton press is preferably a 630 ton press; if other ton presses are used, such as 1250 ton presses, internal delamination and cracking of the product can easily occur. In the present invention, the striking molding is preferably a one-shot molding method, and specific conditions are as follows: hit 16 times with a 630 ton press. The one-step forming under the above conditions means that 16 times of continuous striking is carried out at one time by using a 630-ton press. And striking and forming to obtain the regenerated carbon-free brick green body.

With respect to step c):

in the present invention, the time for the natural drying is preferably 1 day. Baking after natural drying. In the present invention, the baking schedule is preferably: firstly heating to 80 ℃ and preserving heat for 2h, then heating to 150 ℃ and preserving heat for 2h, and continuously heating to 220 ℃ and preserving heat for 6 h. More specifically: firstly, heating from room temperature to 80 ℃, heating for 1h, and keeping the temperature for 2 h; then heating from 80 ℃ to 150 ℃, wherein the heating time is 1h, and the heat preservation time is 2 h; continuously heating from 150 ℃ to 220 ℃, heating for 2h, and keeping the temperature for 6 h; and finally, cooling to room temperature for 2 hours, and taking out of the kiln to obtain the regenerated carbon-free brick product.

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims. In the following examples, the particle size specification of each powder in the premix is as described above. The binding agent is complex magnesium aluminum binding agent MaCaR-46M, which is purchased from Jiyuan maca high temperature ceramics technology limited company.

Example 1

1. Raw materials:

base material:

40 wt% of outer ring castable reclaimed material;

40 wt% of tabular corundum;

20 wt% of premix;

addition of:

the binder accounts for 5.4 wt% of the base material;

the water accounts for 2.7 wt% of the base material.

Wherein:

the outer ring castable reclaimed material comprises:

8 wt% of particles with the particle size of more than 3mm and less than or equal to 5 mm;

18 wt% of particles with the particle size of more than 1mm and less than or equal to 3 mm;

14 wt% of particles with the particle size of more than 0mm and less than or equal to 1 mm.

The plate-like corundum particles include:

7 wt% of particles with the particle size of more than 3mm and less than or equal to 5 mm;

15 wt% of particles with the particle size of more than 1mm and less than or equal to 3 mm;

18 wt% of particles with the particle size of more than 0mm and less than or equal to 1 mm.

The premix comprises the following components:

1.5 wt% of aluminum powder, 1.5 wt% of 97 silicon carbide powder, 6 wt% of white corundum, 10 wt% of active alumina micro powder and 1 wt% of 96 silicon micro powder.

2. Preparation:

and S1, mixing the aluminum powder, the silicon carbide powder, the white corundum, the activated alumina micro powder and the silicon micro powder to obtain the premix.

And S2, adding the outer ring castable reclaimed material and the plate corundum into a 800 forced sand mixer, stirring for 2min, adding water, mixing and grinding for 2min, adding the complex magnesium aluminum binder and the premix, and mixing and grinding for 15min to obtain a mixture.

And S3, striking the obtained mixture on a 630-ton press for 16 times by adopting a one-step forming method to form a primary blank of the regenerative carbon-free brick with the thickness of 100 mm.

S4, naturally drying the blank for one day, and then baking: firstly, heating from room temperature to 80 ℃, heating for 1h, and keeping the temperature for 2 h; then heating from 80 ℃ to 150 ℃, wherein the heating time is 1h, and the heat preservation time is 2 h; continuously heating from 150 ℃ to 220 ℃, heating for 2h, and keeping the temperature for 6 h; and finally, cooling to room temperature for 2 hours, and taking out of the kiln to obtain the regenerated carbon-free brick product.

Example 2

1. Raw materials:

base material:

56 wt% of outer ring castable reclaimed material;

28 wt% of tabular corundum;

16 wt% of premix;

addition of:

the binder accounts for 6 wt% of the base material;

the water accounts for 3.4 wt% of the base material.

Wherein:

the outer ring castable reclaimed material comprises:

18 wt% of particles with the particle size of more than 3mm and less than or equal to 5 mm;

20 wt% of particles with the particle size of more than 1mm and less than or equal to 3 mm;

The plate-like corundum particles include:

6 wt% of particles with the particle size of more than 3mm and less than or equal to 5 mm;

10 wt% of particles with the particle size of more than 1mm and less than or equal to 3 mm;

12 wt% of particles with the particle size of more than 0mm and less than or equal to 1 mm.

The premix comprises the following components:

1 wt% of aluminum powder, 1 wt% of 97 silicon carbide powder, 5 wt% of white corundum, 8.5 wt% of active alumina micropowder and 0.5 wt% of 96 silicon micropowder.

2. Preparation: the same as in example 1.

Example 3

1. Raw materials:

base material:

60 wt% of outer ring castable reclaimed material;

24 wt% of tabular corundum;

16 wt% of premix;

addition of:

7 wt% of a bonding agent;

4 wt% of water.

Wherein:

the outer ring castable reclaimed material comprises:

28 wt% of particles with the particle size of more than 1mm and less than or equal to 3 mm;

The plate-like corundum particles include:

5 wt% of particles with the particle size of more than 3mm and less than or equal to 5 mm;

8 wt% of particles with the particle size of more than 1mm and less than or equal to 3 mm;

11 wt% of particles with the particle size of more than 0mm and less than or equal to 1 mm.

The premix comprises the following components:

1 wt% of aluminum powder, 1 wt% of 97 silicon carbide powder, 5 wt% of white corundum, 8 wt% of activated alumina micropowder and 1 wt% of 96 silicon micropowder.

2. Preparation: the same as in example 1.

Comparative example 1

1. Raw materials:

performed as in example 1, except that the complex magnesium aluminum binder was replaced with a resin binder, phenolic resin, model PF-381D, available from new materials mitsunda lekuwa.

2. Preparation: the same as in example 1.

Comparative example 2

1. Raw materials:

performed as in example 2, except that the complex magnesium aluminum binder was replaced with a resin binder, phenolic resin, model PF-381D, available from new materials mitsunda lekuwa.

2. Preparation: the same as in example 1.

Comparative example 3

1. Raw materials:

performed as in example 3, except that the complex magnesium aluminum binder was replaced with a resin binder, phenolic resin, model PF-381D, available from new materials mitsunda lekuwa.

2. Preparation: the same as in example 1.

Comparative example 4

1. Raw materials:

the procedure is as in example 1, except that the outer ring castable regrind is replaced with virgin raw material, plate corundum.

2. Preparation: the same as in example 1.

Example 4

The regenerated carbon-free brick products obtained in examples 1 to 3 and comparative examples 1 to 4 were subjected to performance tests, and the product performance at normal temperature (110 ℃ X4 h), medium temperature (800 ℃ X3 h) and high temperature (1550 ℃ X3 h) were respectively tested, and the test results are respectively shown in tables 1 to 3.

The three temperatures are important for practical application, wherein the strength at normal temperature is related to the temperature of 110 ℃, and the use can be directly influenced if the strength at normal temperature is poor; the medium temperature relates to the oxidation resistance of the steel ladle when medium-temperature baking is needed before the steel ladle is formally used for receiving molten steel; high temperature directly affects the effect of steel making, and in contrast, high temperature performance is more critical.

Wherein, the compression strength can indicate the sintering condition of the material and the related properties of the structure, and other properties such as wear resistance, impact resistance and the like can be indirectly judged through the compression strength. The re-firing line change is an irreversible change in size of the refractory article after heating to a high temperature, with positive values indicating expansion and negative values indicating shrinkage, and is an aspect of expressing volume stability at high temperatures. Apparent porosity is the percentage of the volume of open pores in the refractory product to the total volume of the product; the method is an important index for evaluating the quality of refractory products, can reflect the compactness of the refractory, and also represents whether the manufacturing process is reasonable. Bulk density is the ratio of the dry mass of a refractory material to its total volume, i.e., the mass per unit volume of the material, and characterizes the degree of densification of the refractory material, and in general, the bulk density of a material is high, which is beneficial for its strength, erosion resistance, wear resistance, and refractoriness under load.

TABLE 1 Normal temperature Performance of examples 1-3 and comparative examples

	Compressive strength, MPa	Re-firing line change,%	Apparent porosity of%	Bulk density, g/cm³
					Example 1	64.6	/	15.9	2.91
Example 2	59.5	/	15.8	2.90
					Example 3	52.1	/	16.3	2.86
Comparative example 4	52.3	/	5.5	3.02

TABLE 2 Medium temperature Performance of examples 1-3 and comparative products

	Compressive strength, MPa	Re-firing line change,%	Apparent porosity of%	Bulk density, g/cm³
					Example 1	28.8	-0.2	19.6	2.83
Example 2	28.5	-0.12	20.4	2.81
					Example 3	26.1	-0.18	20.9	2.80
Comparative example 1	24.8	-0.28	20.8	2.86
					Comparative example 2	28.5	-0.17	20.4	2.85
Comparative example 3	24.4	-0.21	21.5	2.83

TABLE 3 high temperature Performance of examples 1-3 and comparative products

	Compressive strength, MPa	Re-firing line change,%	Apparent porosity of%	Bulk density, g/cm³
					Example 1	166.96	-0.11	10.4	2.94
Example 2	152.3	-0.13	12.6	2.89
					Example 3	140.2	-0.10	18.2	2.88
Comparative example 1	83.5	0.9	13.5	2.91
					Comparative example 2	80.9	0.59	14.6	2.88
Comparative example 3	75.6	0.25	14.9	2.86
					Comparative example 4	124.5	0.09	12.2	2.93

As can be seen from the test results in tables 1 to 3, compared with the product using the original raw material (i.e., comparative example 4), the compressive strength of the regenerated carbon-free brick products obtained in examples 1 to 3 of the present invention is not reduced, or even improved, especially the high temperature strength is significantly improved, the apparent porosity is reduced, and the bulk density is equivalent, which proves that the scheme of the present invention using the regenerated material instead of the original raw material achieves equivalent or even better strength performance compared with the original raw material scheme. Compared with comparative examples 1-3, the compressive strength of the products obtained in examples 1-3 is basically improved, especially the high-temperature compressive strength is obviously improved, and the apparent porosity is reduced, and the invention proves that a certain complexing magnesium-aluminum binding agent adopted by the invention can be better matched with the material system of the invention compared with other binding agents, so that the compressive strength is obviously improved.

The foregoing examples are provided to facilitate an understanding of the principles of the invention and their core concepts, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The scope of the invention is defined by the claims and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that approximate the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.

Claims

1. A regenerative carbon-free brick is characterized by being prepared from raw materials;

the raw materials comprise a base material and additives;

the base material comprises the following components:

40-60 wt% of outer ring castable reclaimed material;

10-45 wt% of plate-shaped corundum particles;

10 wt% -20 wt% of premix;

5-7 wt% of a bonding agent;

2-5 wt% of water;

2. The recycled carbon-free brick of claim 1, wherein the outer ring castable regrind comprises the following powder materials in particle size distribution:

3. The recycled carbonless brick of claim 1, wherein the tabular corundum particles comprise powders having the following particle size distribution:

4. The regenerative carbon-free brick according to claim 1, wherein the binder is a complex magnesium aluminum binder;

5. The recycled carbonless brick of claim 4, wherein the complex magnesium aluminum binder is macal-46M.

6. The recycled carbon-free brick as claimed in claim 1, wherein the proportions of the components in the premix are as follows in terms of the mass ratio of the components in the raw materials:

7. the recycled carbon-free brick of claim 1 or 6, wherein the fineness of the aluminum powder is 180-200 meshes;

the particle size of the silicon carbide powder is 0-0.088 mm;

the granularity of the white corundum is 0-0.045 mm;

the particle size of the active alumina micro powder is 0-5 mu m;

the particle size of the silicon micro powder is 0-5 mu m.

8. The recycled carbon-free brick of claim 1 or 6, wherein the silicon carbide powder is 97 silicon carbide powder;

the silicon micropowder is 96 silicon micropowder.

9. The preparation method of the recycled carbon-free brick as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps:

10. The manufacturing method according to claim 9, wherein in the step b), the striking is shaped to: 16 hits at a 630 ton press;

in the step c):

the natural drying time is 1 day;