CN115925387A - Method for making bricks by using titanium dioxide neutralized slag - Google Patents
Method for making bricks by using titanium dioxide neutralized slag Download PDFInfo
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- CN115925387A CN115925387A CN202211340447.4A CN202211340447A CN115925387A CN 115925387 A CN115925387 A CN 115925387A CN 202211340447 A CN202211340447 A CN 202211340447A CN 115925387 A CN115925387 A CN 115925387A
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- titanium dioxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention discloses a method for using titanium dioxide neutralized slag for brick making, which comprises the following steps: s1, uniformly mixing titanium dioxide neutralization slag and fly ash according to the mass ratio of 40-80; s2, mixing and coarsely crushing the mixed slag, coal gangue and shale according to the mass ratio of 5-15; s3, finely crushing the coarse powder material until the particle size of the particles is less than 5mm to obtain a fine powder material; s4, adding water into the fine powder material, and uniformly mixing, wherein the water adding amount is 5-10% of the mass of the fine powder material, so as to obtain brick making slurry; s5, sequentially extruding and cutting the brick making slurry to obtain green bricks; s6, drying and calcining the green brick to obtain a finished product. The advantages are that: 1) Opens up a new way for the resource utilization of the titanium dioxide neutralization slag. 2) The problem of obviously reduced strength of the sintered brick caused by independently adding the titanium dioxide neutralization slag is solved by combining the titanium dioxide neutralization slag and the fly ash.
Description
Technical Field
The invention relates to a method for treating byproducts in a titanium dioxide production process, in particular to a method for recycling titanium dioxide neutralization slag.
Background
In the production process of titanium dioxide, dust generated by a reaction furnace is collected and added with water to be pulped, and filtered filtrate is added into caustic soda solution to be neutralized to generate a large amount of neutralized waste residues, namely the titanium dioxide neutralized residues. The existing treatment mode is mainly landfill, and because the yield is high, serious environmental pollution risks exist. The inventor proposes that the titanium dioxide neutralized slag can be used for making bricks, but experiments show that the strength of sintered brick products is obviously reduced, so that the titanium dioxide neutralized slag is not suitable for being directly used for producing sintered bricks, and how to recycle the titanium dioxide neutralized slag is still a problem to be solved in the field of percussion.
Disclosure of Invention
In order to solve the problem that the neutralized slag is difficult to recycle, the invention provides a method for producing bricks by using the neutralized slag of titanium dioxide.
The technical scheme adopted by the invention is as follows: the method for preparing the brick by using the titanium dioxide neutralized slag comprises the following steps:
s1, uniformly mixing titanium dioxide neutralization slag and fly ash according to a mass ratio of 40-80;
s2, mixing and coarsely crushing the mixed slag, coal gangue and shale according to the mass ratio of 5-15;
s3, finely crushing the coarse powder material until the particle size of the particles is less than 5mm to obtain a fine powder material;
s4, adding water into the fine powder material, and uniformly mixing, wherein the water adding amount is 5-10% of the mass of the fine powder material, so as to obtain brick making slurry;
s5, sequentially extruding and cutting the brick making slurry to obtain green bricks;
s6, drying and calcining the green brick to obtain a finished product.
Wherein, in the step S2, a jaw crusher can be used as coarse crushing equipment; in step S3, a hammer crusher is used as the coarse pulverization device.
Specifically, the fine pulverization may be carried out as follows: conveying the coarse powder material to a hammer crusher for fine powder through a belt conveyor, screening the fine powder material through a rolling screen, conveying particles with the particle size smaller than 5mm into a screw conveyor, and conveying large particle materials to the hammer crusher for secondary crushing through a conveyer belt.
As a further improvement of the invention, the green brick is dried in step S6 to a water content of not more than 6%.
The invention also discloses a sintered brick product which is prepared by the method for using the titanium dioxide neutralized slag in brick making.
The beneficial effects of the invention are: 1) The compression strength of the sintered brick product produced by using the titanium dioxide neutralization slag by adopting the method reaches 35-37 MPa, and is almost unchanged relative to the compression strength of the sintered brick product without the titanium dioxide neutralization slag, so that the requirement that the compression strength of the sintered brick in GB5101-2003 is more than or equal to 30MPa can be completely met, and a new way for resource utilization of the titanium dioxide neutralization slag is opened up. 2) In addition, the invention overcomes the problem of obviously reduced compressive strength of the sintered brick when the titanium dioxide neutralization slag is added independently by combining the titanium dioxide neutralization slag and the fly ash.
Detailed Description
The present invention will be further described with reference to the following examples.
The first embodiment is as follows:
the baked brick is prepared according to the following steps:
s1, uniformly mixing titanium dioxide neutralization slag and fly ash by using a stirrer according to the mass ratio of 60;
s2, adding the mixed slag, coal gangue and shale into a jaw crusher according to the mass ratio of 10;
s3, conveying the coarse powder material to a hammer crusher through a belt conveyor to obtain fine powder, screening the fine powder material through a rolling screen, conveying particles with the particle size of less than 5mm into a screw conveyor, conveying large particle materials to the hammer crusher through a conveying belt, and crushing again to obtain fine powder materials;
s4, adding water into the fine powder material, and uniformly mixing, wherein the water adding amount is 10% of the mass of the fine powder material, so as to obtain brick making slurry;
s5, conveying the brick making slurry to an extruder through a belt conveyor, extruding the brick making slurry into long-strip mud strips with the cross section size of 245 x 120mm, and cutting the mud strips into bricks with the thickness of 55mm by using a cutting machine;
s6, after the brick blanks are stacked by using a blank stacking machine, drying to reduce the moisture to 5%, transferring the brick blanks into a calcining kiln, preheating the brick blanks for two hours at 450 ℃, calcining the brick blanks for 2 hours at 1200 ℃, preserving the heat for 1 hour, and naturally cooling to obtain finished products.
The dimensional deviation, strength and water absorption after boiling for 5h of the obtained product are detected, and the results are shown in table 1.
The second embodiment:
the baked brick is prepared according to the following steps:
s1, uniformly mixing titanium dioxide neutralization slag and fly ash by using a stirrer according to the mass ratio of 60;
s2, adding the mixed slag, coal gangue and shale into a jaw crusher according to the mass ratio of 15;
s3, conveying the coarse powder material to a hammer crusher for fine powder through a belt conveyor, screening the fine powder material through a rolling screen, conveying particles with the particle size smaller than 5mm into a screw conveyor, conveying large particle material to the hammer crusher through a conveying belt for crushing again, and obtaining fine powder material;
s4, adding water into the fine powder material, and uniformly mixing, wherein the water adding amount is 10% of the mass of the fine powder material, so as to obtain brick making slurry;
s5, conveying the brick making slurry to an extruder through a belt conveyor, extruding the brick making slurry into long-strip mud strips with the cross section size of 245 × 120mm, and cutting the mud strips into bricks with the thickness of 55mm by using a cutting machine;
s6, after the brick blanks are stacked by using a blank stacking machine, drying to reduce the water content to 6%, transferring the brick blanks into a calcining kiln, preheating the brick blanks at 450 ℃ for two hours, calcining the brick blanks at 1200 ℃ for 2 hours, preserving the heat for 1 hour, and naturally cooling to obtain finished products.
The dimensional deviation, strength and water absorption after boiling for 5h of the obtained product are detected, and the results are shown in table 1.
Example three:
the baked brick is prepared according to the following steps:
s1, uniformly mixing titanium dioxide neutralization slag and fly ash by using a stirrer according to the mass ratio of 70;
s2, adding the mixed slag, coal gangue and shale into a jaw crusher according to the mass ratio of 10;
s3, conveying the coarse powder material to a hammer crusher for fine powder through a belt conveyor, screening the fine powder material through a rolling screen, conveying particles with the particle size smaller than 5mm into a screw conveyor, conveying large particle material to the hammer crusher through a conveying belt for crushing again, and obtaining fine powder material;
s4, adding water into the fine powder material, and uniformly mixing, wherein the water adding amount is 8% of the mass of the fine powder material, so as to obtain brick making slurry;
s5, conveying the brick making slurry to an extruder through a belt conveyor, extruding the brick making slurry into long-strip mud strips with the cross section size of 245 × 120mm, and cutting the mud strips into bricks with the thickness of 55mm by using a cutting machine;
s6, after the brick blanks are stacked by using a blank stacking machine, drying to reduce the water content to 4%, transferring the brick blanks into a calcining kiln, preheating the brick blanks at 450 ℃ for two hours, calcining the brick blanks at 1200 ℃ for 2 hours, preserving the heat for 1 hour, and naturally cooling to obtain finished products.
The dimensional deviation, strength and water absorption after boiling for 5h of the obtained product are detected, and the results are shown in table 1.
Example four:
the baked brick is prepared according to the following steps:
s1, uniformly mixing titanium dioxide neutralization slag and fly ash by using a stirrer according to the mass ratio of 70;
s2, adding the mixed slag, coal gangue and shale into a jaw crusher according to the mass ratio of 5;
s3, conveying the coarse powder material to a hammer crusher through a belt conveyor to obtain fine powder, screening the fine powder material through a rolling screen, conveying particles with the particle size of less than 5mm into a screw conveyor, conveying large particle materials to the hammer crusher through a conveying belt, and crushing again to obtain fine powder materials;
s4, adding water into the fine powder material, and uniformly mixing, wherein the water adding amount is 8% of the mass of the fine powder material, so as to obtain brick making slurry;
s5, conveying the brick making slurry to an extruder through a belt conveyor, extruding the brick making slurry into long-strip mud strips with the cross section size of 245 × 120mm, and cutting the mud strips into bricks with the thickness of 55mm by using a cutting machine;
s6, after the brick blanks are stacked by using a blank stacking machine, drying to reduce the water content to 6%, transferring the brick blanks into a calcining kiln, preheating the brick blanks at 450 ℃ for two hours, calcining the brick blanks at 1200 ℃ for 2 hours, preserving the heat for 1 hour, and naturally cooling to obtain finished products.
The dimensional deviation, strength and water absorption after boiling for 5h of the obtained product are detected, and the results are shown in table 1.
Comparative example one:
this comparative example is a control experiment of example one, conducted according to the same procedures and conditions as example one, and all the starting materials were of the same batch as example one, except that: the production raw materials do not contain the mixed slag, and the method comprises the following specific steps:
s1, adding coal gangue and shale into a jaw crusher according to a mass ratio of 30;
s2, conveying the coarse powder material to a hammer crusher through a belt conveyor to obtain fine powder, screening the fine powder material through a rolling screen, conveying particles with the particle size of less than 5mm into a screw conveyor, conveying large particle materials to the hammer crusher through a conveying belt, and crushing again to obtain fine powder materials;
s3, adding water into the fine powder material, and uniformly mixing, wherein the water addition amount is 10% of the mass of the fine powder material, so as to obtain brick making slurry;
s4, conveying the brick making slurry to an extruder through a belt conveyor, extruding the brick making slurry into long-strip mud strips with the cross section size of 245 x 120mm, and cutting the mud strips into bricks with the thickness of 55mm by using a cutting machine;
s5, after the brick blanks are stacked by using a blank stacking machine, drying to reduce the water content to 5%, transferring the brick blanks into a calcining kiln, preheating the brick blanks at 450 ℃ for two hours, calcining the brick blanks at 1200 ℃ for 2 hours, preserving the heat for 1 hour, and naturally cooling to obtain finished products.
The dimensional deviation, the strength and the water absorption rate after boiling for 5 hours of the obtained product are detected, and the results are shown in table 1.
Comparative example two:
this comparative example is a control experiment of example one, conducted according to the same procedures and conditions as example one, and all the starting materials were of the same batch as example one, except that: titanium dioxide neutralization slag with equal mass is adopted to replace mixed slag (namely, fly ash is not used), and the method comprises the following specific steps:
s1, adding titanium dioxide neutralized slag, coal gangue and shale into a jaw crusher according to the mass ratio of 10;
s3, conveying the coarse powder material to a hammer crusher for fine powder through a belt conveyor, screening the fine powder material through a rolling screen, conveying particles with the particle size smaller than 5mm into a screw conveyor, conveying large particle material to the hammer crusher through a conveying belt for crushing again, and obtaining fine powder material;
s4, adding water into the fine powder material, and uniformly mixing, wherein the water addition amount is 10% of the mass of the fine powder material, so as to obtain brick making slurry;
s5, conveying the brick making slurry to an extruder through a belt conveyor, extruding the brick making slurry into long-strip mud strips with the cross section size of 245 × 120mm, and cutting the mud strips into bricks with the thickness of 55mm by using a cutting machine;
s6, after the brick blanks are stacked by using a blank stacking machine, drying to reduce the moisture to 5%, transferring the brick blanks into a calcining kiln, preheating the brick blanks for two hours at 450 ℃, calcining the brick blanks for 2 hours at 1200 ℃, preserving the heat for 1 hour, and naturally cooling to obtain finished products.
The dimensional deviation, strength and water absorption after boiling for 5h of the obtained product are detected, and the results are shown in table 1.
Comparative example three:
this comparative example is a control experiment of example one, conducted according to the same procedures and conditions as example one, and all the starting materials were of the same batch as example one, except that: the method adopts equal-mass fly ash to replace mixed slag (namely titanium dioxide neutralized slag is not used), and comprises the following specific steps:
s1, adding the fly ash, the coal gangue and the shale into a jaw crusher according to the mass ratio of 10;
s3, conveying the coarse powder material to a hammer crusher for fine powder through a belt conveyor, screening the fine powder material through a rolling screen, conveying particles with the particle size smaller than 5mm into a screw conveyor, conveying large particle material to the hammer crusher through a conveying belt for crushing again, and obtaining fine powder material;
s4, adding water into the fine powder material, and uniformly mixing, wherein the water addition amount is 10% of the mass of the fine powder material, so as to obtain brick making slurry;
s5, conveying the brick making slurry to an extruder through a belt conveyor, extruding the brick making slurry into long-strip mud strips with the cross section size of 245 × 120mm, and cutting the mud strips into bricks with the thickness of 55mm by using a cutting machine;
s6, after the brick blanks are stacked by using a blank stacking machine, drying to reduce the moisture to 5%, transferring the brick blanks into a calcining kiln, preheating the brick blanks for two hours at 450 ℃, calcining the brick blanks for 2 hours at 1200 ℃, preserving the heat for 1 hour, and naturally cooling to obtain finished products.
The dimensional deviation, the strength and the water absorption rate after boiling for 5 hours of the obtained product are detected, and the results are shown in table 1.
TABLE 1 performance test results of baked brick
Note: GB5101-2003 qualified products are taken as standards in the table 1.
As can be seen from comparison between the first embodiment and the fourth embodiment in the table 1 and the first comparative embodiment, the strength of the sintered brick prepared by using the mixed slag composed of the titanium dioxide neutralization slag and the fly ash of the invention as a raw material reaches 35-37 MPa, which is not obviously reduced compared with the comparative embodiment, and the product strength completely conforms to the GB5101-2003 standard.
As can be seen from comparison of comparative example I and comparative example II in Table 1, the strength of the sintered brick product is significantly reduced after the titanium dioxide neutralization slag is added during the sintering of the brick, indicating that the titanium dioxide neutralization slag cannot be directly used for the production of the sintered brick.
Claims (6)
1. The method for making bricks by using titanium dioxide neutralized slag comprises the following steps:
s1, uniformly mixing titanium dioxide neutralization slag and fly ash according to a mass ratio of 40-80;
s2, mixing and coarsely crushing the mixed slag, coal gangue and shale according to the mass ratio of 5-15;
s3, finely crushing the coarse powder material until the particle size of the particles is less than 5mm to obtain a fine powder material;
s4, adding water into the fine powder material, and uniformly mixing, wherein the water adding amount is 5-10% of the mass of the fine powder material, so as to obtain brick making slurry;
s5, sequentially extruding and cutting the brick making slurry to obtain green bricks;
s6, drying and calcining the green brick to obtain a finished product.
2. The method for preparing bricks by using the titanium dioxide neutralized slag as claimed in claim 1, which is characterized in that: in step S2, a jaw crusher is used as the coarse crushing apparatus.
3. The method for preparing bricks by using the titanium dioxide neutralized slag as claimed in claim 1, which is characterized in that: in step S3, a hammer crusher is used as the coarse crushing apparatus.
4. The method for making bricks by using the titanium dioxide neutralized slag as claimed in claim 3, which is characterized by comprising the following steps: the fine crushing method in the step S3 comprises the following specific steps: the coarse powder material is conveyed to a hammer crusher through a belt conveyor to obtain fine powder, the fine powder material is sieved through a rolling screen, particles with the particle size smaller than 5mm enter a screw conveyor, and large particle materials are conveyed to the hammer crusher through a conveying belt to be crushed again.
5. The method for preparing bricks by using the titanium dioxide neutralized slag as claimed in claim 1, which is characterized in that: and S6, drying the green brick until the water content is not more than 6%.
6. A sintered brick product prepared by the method for making bricks by using the titanium dioxide neutralized slag as described in any one of claims 1 to 5.
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