阅读说明：本技术 一种耐材吸尘粉回收利用的钢包铝镁耐火泥及其制备方法 (Steel ladle aluminum magnesium refractory mortar for recycling refractory dust-absorbing powder and preparation method thereof ) 是由 沈明科 程文雍 邬晓滢 王颖 刘光平 王玉龙 方义能 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种耐材吸尘粉回收利用的钢包铝镁耐火泥及其制备方法。以质量百分比计,所述钢包铝镁耐火泥的原料组成包括：耐材吸尘粉5.0％～90.0％,粒度为0.5～0.15mm的刚玉细颗粒5.0％～30.0％,粒度为0.5～0.15mm的电熔镁砂细颗粒2.0％～20.0％,刚玉微粉和/或α型活性氧化铝微粉1.0％～10.0％,硅微粉0.5％～5.0％,减水剂0.1％～1.5％,增塑剂0.01％～1.0％,保存剂0.01％～1.0％。所述制备方法包括：先将耐材吸尘粉加入到混碾机内,然后加入减水剂、增塑剂、保存剂混合均匀后,再加入其余原料,继续混合均匀,出料即得所述钢包铝镁耐火泥。(The invention discloses ladle aluminum magnesium refractory mortar for recycling refractory dust absorption powder and a preparation method thereof. The steel ladle aluminum magnesium refractory mortar comprises the following raw materials in percentage by mass: 5.0-90.0 percent of refractory dust-absorbing powder, 5.0-30.0 percent of corundum fine particles with the granularity of 0.5-0.15mm, 2.0-20.0 percent of fused magnesia fine particles with the granularity of 0.5-0.15mm, 1.0-10.0 percent of corundum micro powder and/or alpha-type activated alumina micro powder, 0.5-5.0 percent of silicon micro powder, 0.1-1.5 percent of water reducing agent, 0.01-1.0 percent of plasticizer and 0.01-1.0 percent of preservative. The preparation method comprises the following steps: adding refractory dust-absorbing powder into a mixing mill, adding a water reducing agent, a plasticizer and a preservative, uniformly mixing, adding the rest raw materials, continuously uniformly mixing, and discharging to obtain the ladle aluminum magnesium refractory mortar.)

1. The ladle aluminum magnesium refractory mortar for recycling refractory dust absorption powder is characterized by comprising the following raw materials in percentage by mass:

the refractory dust-absorbing powder is dust-absorbing powder cleaned by a refractory raw material crushing device and/or a refractory product production device dust collector, the granularity is below 0.1mm, and Al is₂O₃The content of the + MgO is more than or equal to 85.00 wt%;

the water reducing agent is one or a mixture of a plurality of polyphosphate, polycarboxylic acid and dispersed alumina high-efficiency water reducing agents in any proportion;

the plasticizer is one or more of carboxymethyl cellulose, yellow dextrin, carboxymethyl starch ether and starch;

the preservative is one or more of oxalic acid, citric acid, boric acid and calcium lignosulfonate;

the preparation method of the ladle aluminum magnesium refractory mortar comprises the following steps: adding refractory dust-absorbing powder into a mixing mill, adding a water reducing agent, a plasticizer and a preservative, uniformly mixing, adding the rest raw materials, continuously uniformly mixing, and discharging to obtain the ladle aluminum magnesium refractory mortar.

2. The ladle aluminum magnesium refractory mortar according to claim 1, wherein the refractory raw material crushing equipment comprises various corundum, alumina and spinel raw material crushing equipment;

the refractory product production equipment comprises high-alumina, corundum and corundum spinel product production equipment.

3. The ladle aluminum magnesium refractory mortar according to claim 1, wherein the corundum fine particles are one or a combination of several of brown corundum, white corundum and tabular corundum used as refractory materials;

al in the corundum fine particles₂O₃The content is more than or equal to 95.00wt percent.

4. The ladle aluminum magnesium refractory mortar of claim 1, wherein the fused magnesite fine particles are magnesite produced by an electric melting method, and the volume density of the fused magnesite fine particles is not less than 3.48g/cm³The MgO content is more than or equal to 97.50wt percent.

5. The ladle aluminum magnesium refractory mortar as recited in claim 1, wherein the corundum micropowder has a particle size of 0.045mm or less and Al₂O₃The content is more than or equal to 98.50wt percent.

6. The ladle aluminum magnesium refractory mortar as defined in claim 1, wherein the particle size of the alpha-type activated alumina micropowder is 0.5-10 μm, and Al is contained in the micropowder₂O₃The content is more than or equal to 98.50wt percent.

7. The ladle aluminum magnesium refractory mortar of claim 1, wherein the silica micropowder has a particle size of 1 μm or less and SiO₂The content is more than or equal to 92.00 wt%.

8. The ladle aluminum magnesium refractory mortar of claim 1, wherein the water reducing agent is one or more of FS10, FS20, FS60, sodium tripolyphosphate and sodium hexametaphosphate.

9. The preparation method of the ladle aluminum magnesium refractory mortar according to any one of claims 1 to 8, comprising the following steps: adding refractory dust-absorbing powder into a mixing mill, adding a water reducing agent, a plasticizer and a preservative, uniformly mixing, adding the rest raw materials, continuously uniformly mixing, and discharging to obtain the ladle aluminum magnesium refractory mortar.

10. The preparation method of claim 9, wherein the water reducing agent, the plasticizer and the preservative are added and mixed for 3-5 min;

adding the rest raw materials and mixing for 12-15 min.

Technical Field

The invention relates to the technical field of refractory materials, in particular to ladle aluminum magnesium refractory mortar for recycling refractory dust absorption powder and a preparation method thereof.

Background

With the development of external refining and continuous casting technologies and the increase of the demand of the market for clean steel, the steel-making technical equipment is large-sized, efficient and continuous casting, and is continuously developed for saving labor, saving energy and reducing consumption, the requirements on steel ladle smelting conditions are higher and higher, and the requirements on refractory materials for steel ladles are also higher. The ladle vacuum refining is a common refining mode in China and is also a refining mode which can cause the most serious erosion to ladle bricks, molten steel is refined in a vacuum environment, and the erosion of the molten steel to refractory materials is severe in the vacuumizing process. The brickwork joint of the bricked ladle can generate an exhaust channel, and the brickwork joint part is most easily washed and eroded. The analysis of the ladle brick residual on the off-line shows that the lowest part of the ladle brick residual thickness is the brick joint of the ladle brick, the effect of the common refractory mortar bearing molten steel scouring and steel slag erosion is worse in the refining environment, and the brick joint residual thickness is about 15-25mm lower than the ladle brick body residual thickness. In addition, the common refractory mortar has large water addition amount, uneven thickness of the constructed brick joints, generates shrinkage at high temperature, is difficult to fill the brick joints completely, and is easy to generate molten steel infiltration and steel clamping at the brick joints.

The patent specification with the publication number of CN112500137A discloses ladle anti-corrosion magnesia refractory mortar and a preparation method thereof, wherein the ladle anti-corrosion magnesia refractory mortar comprises the following preparation raw materials in parts by weight: 40-120 parts of fused magnesia, 1-15 parts of alumina micropowder, 0.5-8 parts of chromium oxide fine powder, 0.5-8 parts of zirconia fine powder, 0.5-8 parts of silicon carbide fine powder, 0.3-4 parts of boron carbide fine powder, 0.1-2 parts of dispersant and 0.1-2 parts of tackifier. The water accounting for 35 percent of the total weight of the mixture is added into the mixture, the ladle anti-erosion magnesia refractory mortar has good molten steel scouring resistance and steel slag erosion resistance, and can solve the problems of low residual thickness and steel inclusion at the brick joint part of the ladle in the VOD refining process.

The patent specification with the publication number of CN112408954A discloses a refractory mortar, which comprises the following raw materials in parts by weight: 30-80 parts of corundum fine powder; 5-25 parts of alumina micro powder; 0-15 parts of quartz powder; 0-15 parts of kyanite fine powder; 0-10% of clay; 0-2 parts of a plasticizer; 1-5 parts of a preservative; 5-20 of a binder. The refractory mortar has good service performance, can be stored for a long time, and is convenient for site construction.

With the increase of environmental awareness, dust collectors are arranged on various refractory raw materials and production places of manufacturers, and collect and separate dust on the production sites. For the collected dust-absorbing powder, the conventional dust-absorbing powder is treated in the following way:

1. because the dust absorption powder has relatively fine granularity, large water absorption capacity, poor moisture retention and large viscosity, when the dust absorption powder is used as fine powder or micro powder in a refractory material to be added, the adding proportion is very small, and the using amount is very limited.

2. The waste of refractory raw materials is large as the discharge of solid wastes.

Disclosure of Invention

Aiming at the technical problems and the defects in the field, the invention provides the ladle aluminum magnesium fire clay for recycling the dust absorption powder of the refractory material, solves the problem of hidden danger of brick joints in the use of the fire clay, and simultaneously reduces the waste of dust absorption powder discharged as solid waste by refractory material enterprises.

The ladle aluminum magnesium refractory mortar for recycling refractory dust-absorbing powder comprises the following raw materials in percentage by mass:

the refractory dust-absorbing powder is dust-absorbing powder cleaned by a refractory raw material crushing device and/or a refractory product production device dust collector, the granularity is below 0.1mm, and Al is₂O₃The content of the + MgO is more than or equal to 85.00 wt%;

the water reducing agent is one or a mixture of a plurality of polyphosphate, polycarboxylic acid and dispersed alumina high-efficiency water reducing agents in any proportion;

the plasticizer is one or more of carboxymethyl cellulose, yellow dextrin, carboxymethyl starch ether and starch;

the preservative is one or more of oxalic acid, citric acid, boric acid and calcium lignosulfonate;

the preparation method of the ladle aluminum magnesium refractory mortar comprises the following steps: adding refractory dust-absorbing powder into a mixing mill, adding a water reducing agent, a plasticizer and a preservative, uniformly mixing, adding the rest raw materials, continuously uniformly mixing, and discharging to obtain the ladle aluminum magnesium refractory mortar.

With the improvement of environmental protection consciousness, bag-type dust collectors are arranged in various refractory raw materials and production places of manufacturers, and the working mechanism of the bag-type dust collector is that dust smoke containing dust passes through a filtering material, and dust particles are filtered. The filtering material mainly collects coarse-grained dust under the action of inertial collision and collects fine-grained dust under the action of diffusion and screening. The dust layer of the filter material also has a certain filtering function.

Detecting the particle size of the dust absorption powder to be 0.1-3 mu m, wherein the particle size belongs to ultrafine powder in the refractory material. The dust absorption powder has the advantages of fine particles, good fluidity, good dispersibility, large specific surface area and high reaction activity. By utilizing the dispersion effect of the dust absorption powder, the construction water consumption of the refractory mortar can be reduced, and the construction performance of the refractory mortar is improved. The dust absorption powder can fill gaps and particle gaps in the building process, so that the building is compact, and the strength of building combination is improved; the dust-absorbing powder has large specific surface area, higher activity and convenient sintering, and can increase solid-phase combination by matching with proper quantity, so that the material has more chances of forming ceramic combination at lower temperature, the strength is improved, and the material is favorable for resisting the scouring and melting loss of molten steel slag, thereby prolonging the service life and ensuring the safe operation of the ladle.

The conventional dust absorption powder treatment mode is used for discharging solid wastes, and the waste of refractory raw materials is large. Because the dust absorption powder has relatively fine granularity, large water absorption capacity, poor moisture retention and large viscosity, and the conventional product has very small use proportion when using the dust absorption powder, the dust absorption powder is used by matching the water reducing agent, the plasticizer and the preservative of specific types, and the dust absorption powder, the water reducing agent, the plasticizer and the preservative are uniformly mixed in the preparation process, so that the dust absorption powder (which can be up to 90wt percent) can be added in a large proportion to be used for the converter steel ladle aluminum magnesium fire clay, the viscosity of the fire clay is improved by utilizing the small granularity of the dust absorption powder, the discharge of solid wastes is reduced, the utilization rate of the raw materials of the fire clay is improved, and the cost of the fire clay is reduced.

And secondly, because the dust absorption powder has relatively fine granularity, the dust absorption powder has high reaction activity, and is easy to react with magnesia to generate magnesia-alumina spinel under a high-temperature condition.

In addition, the conventional refractory mortar product has fine granularity, does not have particles as supporting aggregates of the refractory mortar, and has the phenomenon of uneven thickness when the refractory mortar is built.

Therefore, the preparation method of the ladle aluminum magnesium refractory mortar provided by the invention is simple and easy to implement, has low cost, and has excellent construction performance, bonding strength, high-temperature performance and erosion resistance.

The refractory raw material crushing equipment comprises various corundum, alumina, aluminum oxide and spinel raw material crushing equipment.

The refractory product production equipment comprises high-alumina, corundum and corundum spinel product production equipment.

Preferably, the corundum fine particles are one or a combination of several of brown corundum, white corundum and tabular corundum used as refractory materials.

Preferably, the ladle aluminum magnesium refractory mortar contains Al in corundum fine particles₂O₃The content is more than or equal to 95.00wt percent.

Preferably, the ladle aluminum magnesium refractory mortar has the fused magnesia fine particles produced by an electric melting method, and the volume density of the fused magnesia fine particles is more than or equal to 3.48g/cm³The MgO content is more than or equal to 97.50wt percent.

Preferably, the granularity of the corundum micropowder is less than or equal to 0.045mm, and the Al micropowder is made of aluminum, magnesium and aluminum₂O₃The content is more than or equal to 98.50wt percent.

Preferably, the grain size of the alpha-type activated alumina micropowder is 0.5-10 mu m, and Al is contained in the ladle aluminum magnesium refractory mortar₂O₃The content is more than or equal to 98.50wt percent.

Preferably, the steel ladle aluminum magnesium refractory mortar has the silicon micropowder granularity less than or equal to 1 mu m and SiO₂The content is more than or equal to 92.00 wt%.

Preferably, the ladle aluminum magnesium refractory mortar comprises one or more of FS10, FS20, FS60, sodium tripolyphosphate and sodium hexametaphosphate.

As a general inventive concept, the invention also provides a preparation method of the ladle aluminum magnesium refractory mortar, which comprises the following steps: adding refractory dust-absorbing powder into a mixing mill, adding a water reducing agent, a plasticizer and a preservative, uniformly mixing, adding the rest raw materials, continuously uniformly mixing, and discharging to obtain the ladle aluminum magnesium refractory mortar.

Preferably, the preparation method comprises the step of adding the water reducing agent, the plasticizer and the preservative, and then mixing for 3-5 min.

Preferably, in the preparation method, the mixing time is 12-15 min after the other raw materials are added.

Compared with the prior art, the invention has the main advantages that: the refractory mortar can be added with up to 90 wt% of dust absorption powder reclaimed materials, so that the discharge of solid wastes is obviously reduced, the waste of refractory raw materials is reduced, and the raw material cost of the refractory mortar is reduced; meanwhile, corundum with specific granularity and fused magnesia fine particles are added into the refractory mortar, so that the fire clay at refractory brick seams is full, the use is stable, the brick seams are controllable, and the turnover safety performance of the steel ladle is improved.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.

Example 1

The raw materials comprise the following components in percentage by weight: 45.0% of refractory dust-absorbing powder (Al)₂O₃The content of the corundum is more than or equal to 95.00 wt%, the granularity is 0.1-0mm), and 30.0% of tabular corundum fine particles (Al) with the granularity of 0.5-0.15mm₂O₃Content is more than or equal to 95.00wt percent, 14.0 percent of fused magnesia fine particles with the granularity of 0.5-0.15mm (volume density is more than or equal to 3.48 g/cm)³MgO content is more than or equal to 97.50wt percent, and 8 percent of corundum micro powder (Al) with granularity less than or equal to 0.045mm₂O₃More than or equal to 98.50wt percent and 1.5 percent of silicon micropowder (the granularity is less than or equal to 1 mu m, SiO)₂The content is more than or equal to 92.00wt percent), 0.5 percent of water reducing agent sodium hexametaphosphate, 0.5 percent of plasticizer carboxymethyl cellulose and 0.5 percent of preservative citric acid.

A200-type mixing mill is adopted to mix 250 kg of materials at a time.

Firstly, adding the refractory dust-absorbing powder into a mixing and rolling machine, then adding the water reducing agent, the plasticizer and the preservative, mixing for 3 minutes, then adding the rest raw materials, continuously mixing for 15 minutes, discharging and packaging to obtain the ladle aluminum magnesium refractory mortar.

The water adding amount of the refractory mortar in construction is detected to be 22.0 wt%, the bonding rupture strength of 2.2MPa at 110 ℃ for 24h and the bonding rupture strength of 8.0MPa at 1500 ℃ for 3h, the construction performance of the refractory mortar is better, and the construction time can be more than 5 hours.

Comparative example 1

The difference from example 1 is only that the starting material composition is reduced by the addition of the aqueous reducing agent, and the rest is the same. The water adding amount of the fire clay for construction is detected to be 32.0 wt%, the bonding rupture strength of 110 ℃ multiplied by 24h is detected to be 1.0MPa, the bonding rupture strength of 1500 ℃ multiplied by 3h is detected to be 3.0MPa, the strength is obviously reduced, meanwhile, the material sense is dilute during the construction of the fire clay, the fire clay is not full in masonry brick joints during the construction, and potential safety hazards exist in the use of the fire clay.

Example 2

The raw materials comprise the following components in percentage by weight: 75.0% of refractory dust-absorbing powder (Al)₂O₃The content of (B) is more than or equal to 87.00 percent, the content of MgO is 10.00 weight percent, the granularity is 0.1-0mm), the granularity of 10.0 percent is 0.5-0.15mm white corundum fine particles (Al)₂O₃Content is more than or equal to 95.00wt percent, 5.5 percent of fused magnesia fine particles with the granularity of 0.5-0.15mm (volume density is more than or equal to 3.48 g/cm)³MgO content is more than or equal to 97.50wt percent, and 6 percent of corundum micro powder (Al) with granularity less than or equal to 0.045mm₂O₃Content is more than or equal to 98.50wt percent, 2 percent of silicon micropowder (granularity is less than or equal to 1 mu m, SiO)₂Content is more than or equal to 92.00wt percent), 0.4 percent of water reducing agent sodium tripolyphosphate, 0.4 percent of water reducing agent sodium hexametaphosphate, 0.2 percent of plasticizer carboxymethyl cellulose, 0.1 percent of plasticizer starch and 0.4 percent of preservative citric acid.

A200-type mixing mill is adopted to mix 250 kg of materials at a time.

Firstly, adding the refractory dust-absorbing powder into a mixing and rolling machine, then adding the water reducing agent, the plasticizer and the preservative, mixing for 4 minutes, then adding the rest raw materials, continuously mixing for 13 minutes, discharging and packaging to obtain the ladle aluminum magnesium refractory mortar.

The water adding amount of the refractory mortar in construction is detected to be 25.0 wt%, the bonding rupture strength at 110 ℃ for 24h is detected to be 2.8MPa, the bonding rupture strength at 1500 ℃ for 3h is detected to be 6.5MPa, the construction performance of the refractory mortar is better, and the construction time can be more than 6 hours.

Comparative example 2

The difference from example 2 is only that the plasticizer addition is eliminated from the raw material composition, and the rest is the same. The water adding amount of the refractory mortar in construction is detected to be 26.0 wt%, the refractory mortar is precipitated and layered in the construction process, and the layered refractory mortar is sandy and non-viscous and cannot be constructed. The fire clay has potential safety hazard in use.

Example 3

The raw materials comprise the following components in percentage by weight: 85.0% of refractory dust-absorbing powder (Al)₂O₃The content of (A) is more than or equal to 90.00%, the content of MgO is 5.00%, the granularity is 0.1-0mm, and 7.0% of tabular corundum fine particles (Al) with the granularity of 0.5-0.15mm₂O₃Content is more than or equal to 95.00wt percent, 4.0 percent of fused magnesia fine particles with granularity of 0.5-0.15mm (volume density is more than or equal to 3.48 g/cm)³MgO content is more than or equal to 97.50wt percent, and 2 percent of corundum micro powder (Al) with granularity less than or equal to 0.045mm₂O₃Content is more than or equal to 98.50wt percent, 1 percent of silicon micropowder (granularity is less than or equal to 1 mu m, SiO)₂Content not less than 92.00 wt%), 0.6% minusAqueous polycarboxylic acid, 0.2% of plasticizer yellow dextrin, 0.1% of preservative oxalic acid and 0.1% of preservative citric acid.

A200-type mixing mill is adopted to mix 250 kg of materials at a time.

Firstly, adding the refractory dust-absorbing powder into a mixing and rolling machine, then adding the water reducing agent, the plasticizer and the preservative, mixing for 5 minutes, then adding the rest raw materials, continuously mixing for 12 minutes, discharging and packaging to obtain the ladle aluminum magnesium refractory mortar.

The water adding amount of the refractory mortar in construction is detected to be 28.0 wt%, the bonding rupture strength at 110 ℃ for 24h is detected to be 3.2MPa, the bonding rupture strength at 1500 ℃ for 3h is detected to be 10.5MPa, the construction performance of the refractory mortar is better, and the construction time can be more than 8 hours.

Comparative example 3

The difference from example 3 is only that the preservative addition is eliminated in the raw material composition, and the rest is the same. The water adding amount of the refractory mortar in construction is detected to be 28.0 wt%, the construction time of the refractory mortar is about 0.5 hour, and the refractory mortar is hardened in the field construction process and cannot be used for construction.

Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the invention as defined by the appended claims.