River sludge fired water permeable brick and preparation method thereof

Abstract

The invention relates to the technical field of water permeable bricks, and discloses a river sludge fired water permeable brick and a preparation method thereof, and the river sludge fired water permeable brick is prepared from the following components: river sludge, waste residue, iron ore tailings, glass waste, crushed crude pearlite, coal gangue, fly ash, a sludge regulator and straw powder; the river sludge is used as the preparation raw material of the water permeable brick, and the prepared water permeable brick has excellent mechanical properties and high water permeability. According to the invention, the river sludge is introduced, and the river sludge has high adhesive property and can combine the components together, so that the use of cement and clay in the conventional water permeable brick is saved, and the cost of the cement and the clay is relatively high, so that the production cost can be greatly reduced, and the water permeable brick has more economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of permeable bricks, in particular to a permeable brick made by firing river sludge and a preparation method thereof. Background Art

[0002] Seepage bricks: also called permeable bricks, Dutch bricks, etc., are new green and environmentally friendly building materials. The raw materials are mostly made of environmentally friendly materials such as cement, sand, slag, fly ash, etc., which are formed under high pressure.

[0003] However, the large-scale use of cement as raw material not only leads to high production costs, but also large-scale production of cement will put great pressure on the environment. Therefore, it is necessary to find alternative raw materials to reduce the production cost of permeable bricks.

[0004] With the widespread and continuous development of water environment governance projects and the continuous expansion of governance areas, a large amount of river sludge will be generated in river and lake dredging projects. These river sludges are generally piled on vacant land, occupying a large amount of land resources.

[0005] River sludge is a multi-media substance with a very high water content. In addition to a large amount of water, it also contains pathogens, microorganisms, organic matter, heavy metals, salts and other complex substances. If it is not treated in time, it can easily cause secondary pollution.

[0006] The present invention adds river sludge as a raw material into the preparation of permeable bricks, and later, after high-temperature firing, pathogens, microorganisms, etc. therein can be completely killed, and the phenomenon of secondary pollution can be effectively reduced.

[0007] Based on this, we proposed a permeable brick made of river sludge, hoping to solve the shortcomings of the existing technology. Summary of the invention

[0008] 1. Technical issues to be resolved

[0009] In view of the deficiencies in the prior art, the present invention provides a river sludge fired permeable brick and a preparation method thereof.

[0010] (II) Technical solution

[0011] To achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0012] A river sludge fired permeable brick, comprising the following components in parts by weight:

[0013] 50-60 parts of river sludge, 30-35 parts of waste residue, 10-18 parts of iron ore tailings, 3-5 parts of glass waste, 1-2 parts of perlite powder, 5-8 parts of coal gangue, 2-5 parts of fly ash, 3-4 parts of sludge conditioner, and 3-6 parts of straw powder.

[0014] As a further technical solution, the sludge conditioner preparation method comprises the following steps:

[0015] (1) adding diatomaceous earth to a grinder for grinding, and sieving to obtain diatomaceous earth powder;

[0016] (2) adding the ground diatomaceous earth powder into a resistance furnace, performing heat treatment for 45 minutes under the protection of an inert atmosphere, and then cooling the mixture to room temperature with the furnace to obtain heat-treated diatomaceous earth powder;

[0017] (3) Preparation of treatment solution:

[0018] Adding sodium hydroxide to water, stirring and mixing evenly to obtain a sodium hydroxide solution;

[0019] Then, sodium dodecyl sulfate is added to the sodium hydroxide solution, and the mixture is stirred and mixed to obtain a treated solution;

[0020] (4) The heat-treated diatomaceous earth is mixed with the treatment liquid, and then the temperature is adjusted to 80° C., and stirred at a speed of 500 r / min for 2 hours, and then filtered and dried to obtain a sludge conditioner.

[0021] As a further technical solution, in step (1), the product is sieved through a 100-mesh sieve, the grinding speed is 1200 r / min, and the grinding time is 2 hours.

[0022] As a further technical solution: the inert atmosphere in step (2) is nitrogen.

[0023] As a further technical solution: the heat treatment temperature is 650°C and the time is 30 minutes.

[0024] As a further technical solution, the mass fraction of sodium hydroxide in the treatment solution in step (3) is 10%;

[0025] The mass fraction of sodium dodecyl sulfate in the treatment liquid is 3%.

[0026] As a further technical solution, in step (4), the mass ratio of the treated diatomaceous earth to the treated liquid is 1:12.

[0027] As a further technical solution: the waste slag is blast furnace slag.

[0028] A method for preparing permeable bricks fired from river sludge, comprising the following steps:

[0029] S1 weighs the following according to weight: river sludge, waste residue, iron ore tailings, glass waste, perlite powder, coal gangue, fly ash, sludge conditioner, straw powder;

[0030] S2 adds river sludge and sludge conditioner into the mixer in sequence and stirs and mixes for 30 minutes;

[0031] S3 continues to add waste slag, iron ore tailings, glass waste, perlite powder, coal gangue, fly ash, and straw powder into the mixer, and continues to stir for 1 hour to obtain a mixture;

[0032] S4 injects the mixture into a mold and performs pressing to form a brick;

[0033] The pressing pressure is 22.5MPa;

[0034] S5: placing the bricks in a drying oven for drying at a temperature of 80°C for 20 hours;

[0035] S6 sintering the dried bricks to obtain finished permeable bricks;

[0036] The sintering temperature is 1120°C and the sintering time is 120 min.

[0037] (III) Beneficial effects

[0038] Compared with the prior art, the present invention provides a river sludge fired permeable brick, which has the following beneficial effects:

[0039] The present invention uses river sludge as the raw material for preparing permeable bricks, so that the prepared permeable bricks have excellent mechanical properties and high water permeability.

[0040] Since the present invention introduces river sludge, which has high bonding properties, it can combine the various components together, saving the use of cement and clay in conventional permeable bricks, while the cost of cement and clay is relatively high. In this way, the production cost can be greatly reduced, which is more economical.

[0041] However, if only river sludge is used, due to its excessive water content and excessive load, it will easily cause the mechanical properties of permeability to be relatively general. Therefore, the present invention introduces a certain amount of sludge regulator. Through the use of the sludge regulator, the structural properties of the river sludge can be greatly improved, so that during the firing process, the fired components will produce a certain glass liquid phase, which can tightly combine the components together, thereby improving the mechanical properties of the permeable brick. At the same time, through the introduction of straw powder, combustion can occur during the firing process, and a complex and rich pore structure is generated at the original position of the straw powder, thereby greatly improving the permeability coefficient of the permeable brick.

[0042] In addition, during the sintering process, blast furnace slag, iron ore tailings, coal gangue, etc. will produce a large amount of spinel phase, which enhances the hardness of the components and provides strong support for the entire permeable brick. DETAILED DESCRIPTION

[0043] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] Example 1

[0045] A method for preparing permeable bricks fired from river sludge, comprising the following steps:

[0046] S1 is weighed in parts by weight: 50 parts of river sludge, 30 parts of blast furnace slag, 10 parts of iron ore tailings, 3 parts of glass waste, 1 part of perlite powder, 5 parts of coal gangue, 2 parts of fly ash, 3 parts of sludge conditioner, and 3 parts of straw powder; the preparation method of the sludge conditioner includes the following steps:

[0047] (1) adding diatomaceous earth into a grinder for grinding at a speed of 1200 r / min for 2 hours, and passing through a 100-mesh sieve to obtain diatomaceous earth powder;

[0048] (2) adding the ground diatomite powder into a resistance furnace, and heat treating it for 45 minutes under nitrogen protection, and then cooling it to room temperature with the furnace to obtain heat-treated diatomite powder; the heat treatment temperature is 650° C., and the time is 30 minutes;

[0049] (3) Preparation of treatment solution:

[0050] Adding sodium hydroxide to water, stirring and mixing evenly to obtain a sodium hydroxide solution;

[0051] Then, sodium dodecyl sulfate is added to the sodium hydroxide solution, and the mixture is stirred and mixed to obtain a treatment solution; the mass fraction of sodium hydroxide in the treatment solution is 10%;

[0052] The mass fraction of sodium dodecyl sulfate in the treatment liquid is 3%.

[0053] (4) The heat-treated diatomaceous earth is mixed with the treatment liquid, and then the temperature is adjusted to 80° C., stirred at a speed of 500 r / min for 2 hours, filtered, and dried to obtain a sludge conditioner; the mass ratio of the treated diatomaceous earth to the treatment liquid is 1:12.

[0054] S2 adds river sludge and sludge conditioner into the mixer in sequence and stirs and mixes for 30 minutes;

[0055] S3 continues to add waste slag, iron ore tailings, glass waste, perlite powder, coal gangue, fly ash, and straw powder into the mixer, and continues to stir for 1 hour to obtain a mixture;

[0056] S4 injects the mixture into a mold and performs pressing to form a brick;

[0057] The pressing pressure is 22.5MPa;

[0058] S5: placing the bricks in a drying oven for drying at a temperature of 80°C for 20 hours;

[0059] S6 sintering the dried bricks to obtain finished permeable bricks;

[0060] The sintering temperature is 1120°C and the sintering time is 120 min.

[0061] Example 2

[0062] A method for preparing permeable bricks fired from river sludge, comprising the following steps:

[0063] S1 is weighed in parts by weight: 58 parts of river sludge, 33 parts of blast furnace slag, 16 parts of iron ore tailings, 4 parts of glass waste, 1.5 parts of perlite powder, 6 parts of coal gangue, 4 parts of fly ash, 3.3 parts of sludge conditioner, and 5 parts of straw powder; the preparation method of the sludge conditioner comprises the following steps:

[0064] (1) adding diatomaceous earth into a grinder for grinding at a speed of 1200 r / min for 2 hours, and passing through a 100-mesh sieve to obtain diatomaceous earth powder;

[0065] (2) adding the ground diatomite powder into a resistance furnace, and heat treating it for 45 minutes under nitrogen protection, and then cooling it to room temperature with the furnace to obtain heat-treated diatomite powder; the heat treatment temperature is 650° C., and the time is 30 minutes;

[0066] (3) Preparation of treatment solution:

[0067] Adding sodium hydroxide to water, stirring and mixing evenly to obtain a sodium hydroxide solution;

[0068] Then, sodium dodecyl sulfate is added to the sodium hydroxide solution, and the mixture is stirred and mixed to obtain a treatment solution; the mass fraction of sodium hydroxide in the treatment solution is 10%;

[0069] The mass fraction of sodium dodecyl sulfate in the treatment liquid is 3%.

[0070] (4) The heat-treated diatomaceous earth is mixed with the treatment liquid, and then the temperature is adjusted to 80° C., stirred at a speed of 500 r / min for 2 hours, filtered, and dried to obtain a sludge conditioner; the mass ratio of the treated diatomaceous earth to the treatment liquid is 1:12.

[0071] S2 adds river sludge and sludge conditioner into the mixer in sequence and stirs and mixes for 30 minutes;

[0072] S3 continues to add waste slag, iron ore tailings, glass waste, perlite powder, coal gangue, fly ash, and straw powder into the mixer, and continues to stir for 1 hour to obtain a mixture;

[0073] S4 injects the mixture into a mold and performs pressing to form a brick;

[0074] The pressing pressure is 22.5MPa;

[0075] S5: placing the bricks in a drying oven for drying at a temperature of 80°C for 20 hours;

[0076] S6 sintering the dried bricks to obtain finished permeable bricks;

[0077] The sintering temperature is 1120°C and the sintering time is 120 min.

[0078] Example 3

[0079] A method for preparing permeable bricks fired from river sludge, comprising the following steps:

[0080] S1 is weighed in parts by weight: 60 parts of river sludge, 35 parts of blast furnace slag, 18 parts of iron ore tailings, 5 parts of glass waste, 2 parts of perlite powder, 8 parts of coal gangue, 5 parts of fly ash, 4 parts of sludge conditioner, and 6 parts of straw powder; the preparation method of the sludge conditioner comprises the following steps:

[0081] (1) adding diatomaceous earth into a grinder for grinding at a speed of 1200 r / min for 2 hours, and passing through a 100-mesh sieve to obtain diatomaceous earth powder;

[0082] (2) adding the ground diatomite powder into a resistance furnace, and heat treating it for 45 minutes under nitrogen protection, and then cooling it to room temperature with the furnace to obtain heat-treated diatomite powder; the heat treatment temperature is 650° C., and the time is 30 minutes;

[0083] (3) Preparation of treatment solution:

[0084] Adding sodium hydroxide to water, stirring and mixing evenly to obtain a sodium hydroxide solution;

[0085] Then, sodium dodecyl sulfate is added to the sodium hydroxide solution, and the mixture is stirred and mixed to obtain a treatment solution; the mass fraction of sodium hydroxide in the treatment solution is 10%;

[0086] The mass fraction of sodium dodecyl sulfate in the treatment liquid is 3%.

[0087] (4) The heat-treated diatomaceous earth is mixed with the treatment liquid, and then the temperature is adjusted to 80° C., stirred at a speed of 500 r / min for 2 hours, filtered, and dried to obtain a sludge conditioner; the mass ratio of the treated diatomaceous earth to the treatment liquid is 1:12.

[0088] S2 adds river sludge and sludge conditioner into the mixer in sequence and stirs and mixes for 30 minutes;

[0089] S3 continues to add waste slag, iron ore tailings, glass waste, perlite powder, coal gangue, fly ash, and straw powder into the mixer, and continues to stir for 1 hour to obtain a mixture;

[0090] S4 injects the mixture into a mold and performs pressing to form a brick;

[0091] The pressing pressure is 22.5MPa;

[0092] S5: placing the bricks in a drying oven for drying at a temperature of 80°C for 20 hours;

[0093] S6 sintering the dried bricks to obtain finished permeable bricks;

[0094] The sintering temperature is 1120°C and the sintering time is 120 min.

[0095] Example 4

[0096] A method for preparing permeable bricks fired from river sludge, comprising the following steps:

[0097] S1 is weighed in parts by weight: 55 parts of river sludge, 31 parts of blast furnace slag, 12 parts of iron ore tailings, 4 parts of glass waste, 1 part of perlite powder, 8 parts of coal gangue, 3 parts of fly ash, 3 parts of sludge conditioner, and 4 parts of straw powder; the preparation method of the sludge conditioner comprises the following steps:

[0098] (1) adding diatomaceous earth into a grinder for grinding at a speed of 1200 r / min for 2 hours, and passing through a 100-mesh sieve to obtain diatomaceous earth powder;

[0099] (2) adding the ground diatomite powder into a resistance furnace, and heat treating it for 45 minutes under nitrogen protection, and then cooling it to room temperature with the furnace to obtain heat-treated diatomite powder; the heat treatment temperature is 650° C., and the time is 30 minutes;

[0100] (3) Preparation of treatment solution:

[0101] Adding sodium hydroxide to water, stirring and mixing evenly to obtain a sodium hydroxide solution;

[0102] Then, sodium dodecyl sulfate is added to the sodium hydroxide solution, and the mixture is stirred and mixed to obtain a treatment solution; the mass fraction of sodium hydroxide in the treatment solution is 10%;

[0103] The mass fraction of sodium dodecyl sulfate in the treatment liquid is 3%.

[0104] (4) The heat-treated diatomaceous earth is mixed with the treatment liquid, and then the temperature is adjusted to 80° C., stirred at a speed of 500 r / min for 2 hours, filtered, and dried to obtain a sludge conditioner; the mass ratio of the treated diatomaceous earth to the treatment liquid is 1:12.

[0105] S2 adds river sludge and sludge conditioner into the mixer in sequence and stirs and mixes for 30 minutes;

[0106] S3 continues to add waste slag, iron ore tailings, glass waste, perlite powder, coal gangue, fly ash, and straw powder into the mixer, and continues to stir for 1 hour to obtain a mixture;

[0107] S4 injects the mixture into a mold and performs pressing to form a brick;

[0108] The pressing pressure is 22.5MPa;

[0109] S5: placing the bricks in a drying oven for drying at a temperature of 80°C for 20 hours;

[0110] S6 sintering the dried bricks to obtain finished permeable bricks;

[0111] The sintering temperature is 1120°C and the sintering time is 120 min.

[0112] Comparative Example 1

[0113] A method for preparing permeable bricks fired from river sludge, comprising the following steps:

[0114] S1 was weighed in parts by weight: 50 parts of river sludge, 30 parts of blast furnace slag, 10 parts of iron ore tailings, 3 parts of glass waste, 1 part of perlite powder, 5 parts of coal gangue, 2 parts of fly ash, and 3 parts of straw powder;

[0115] S2 adds river sludge and sludge conditioner into the mixer in sequence and stirs and mixes for 30 minutes;

[0116] S3 continues to add waste slag, iron ore tailings, glass waste, perlite powder, coal gangue, fly ash, and straw powder into the mixer, and continues to stir for 1 hour to obtain a mixture;

[0117] S4 injects the mixture into a mold and performs pressing to form a brick;

[0118] The pressing pressure is 22.5MPa;

[0119] S5: placing the bricks in a drying oven for drying at a temperature of 80°C for 20 hours;

[0120] S6 sintering the dried bricks to obtain finished permeable bricks;

[0121] The sintering temperature is 1120°C and the sintering time is 120 min.

[0122] test

[0123] According to the mold size of the permeable brick 50mm×25mm×10mm, the permeable brick samples of the embodiment and the comparative example were produced and tested:

[0124] The water permeability coefficient of the permeable bricks of the embodiment and the comparative example samples was tested (GB / T 25993-2010):

[0125] Table 1

[0126] Water permeability cm / s Example 1 0.080 Example 2 0.076 Example 3 0.077 Example 4 0.083 Comparative Example 1 0.050

[0127] It can be seen from Table 1 that the permeable bricks prepared by the present invention have a higher water permeability coefficient.

[0128] The flexural strength of the examples and comparative examples was tested according to the standard of "Permeable Pavement Bricks and Permeable Pavement Panels";

[0129] Table 2

[0130] Flexural strength MPa Example 1 10.8 Example 2 11.3 Example 3 11.1 Example 4 10.2 Comparative Example 1 7.4

[0131] It can be seen from Table 2 that by introducing the sludge conditioner prepared by the present invention, the flexural strength of the prepared permeable brick can be significantly improved.

[0132] According to the standard GB / T2542-2012, the compressive strength of the sludge sintered bricks prepared in the embodiment and the comparative example was tested:

[0133] Table 3

[0134]

[0135]

[0136] It can be seen from Table 3 that the permeable bricks prepared by the present invention have a high compressive strength. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A permeable brick made of river sludge, characterized in that: The following ingredients are included by weight: 50-60 parts of river sludge, 30-35 parts of waste residue, 10-18 parts of iron ore tailings, 3-5 parts of glass waste, 1-2 parts of perlite powder, 5-8 parts of coal gangue, 2-5 parts of fly ash, 3-4 parts of sludge conditioner, and 3-6 parts of straw powder.

2. The permeable brick made of river sludge according to claim 1, characterized in that: The sludge conditioner preparation method comprises the following steps: (1) adding diatomaceous earth to a grinder for grinding, and sieving to obtain diatomaceous earth powder; (2) adding the ground diatomaceous earth powder into a resistance furnace, performing heat treatment for 45 minutes under the protection of an inert atmosphere, and then cooling the mixture to room temperature with the furnace to obtain heat-treated diatomaceous earth powder; (3) Preparation of treatment solution: Adding sodium hydroxide to water, stirring and mixing evenly to obtain a sodium hydroxide solution; Then, sodium dodecyl sulfate is added to the sodium hydroxide solution, and the mixture is stirred and mixed to obtain a treated solution; (4) The heat-treated diatomaceous earth is mixed with the treatment liquid, and then the temperature is adjusted to 80° C., and stirred at a speed of 500 r / min for 2 hours, and then filtered and dried to obtain a sludge conditioner.

3. The river sludge fired permeable brick according to claim 2, characterized in that: In step (1), the product is passed through a 100-mesh sieve, the grinding speed is 1200 r / min, and the grinding time is 2 hours.

4. The permeable brick made of river sludge according to claim 2, characterized in that: The inert atmosphere in step (2) is nitrogen.

5. The permeable brick made of river sludge according to claim 4, characterized in that: The heat treatment temperature is 650°C and the time is 30 minutes.

6. The river sludge fired permeable brick according to claim 2, characterized in that: The mass fraction of sodium hydroxide in the treatment solution in step (3) is 10%; The mass fraction of sodium dodecyl sulfate in the treatment liquid is 3%.

7. The permeable brick made of river sludge according to claim 2, characterized in that: In step (4), the mass ratio of the treated diatomaceous earth to the treated liquid is 1:

12.

8. The permeable brick made of river sludge according to claim 1, characterized in that: The waste slag is blast furnace slag.

9. The method for preparing permeable bricks fired from river sludge according to claim 1, characterized in that: The following steps are involved: S1 weighs the following according to weight: river sludge, waste residue, iron ore tailings, glass waste, perlite powder, coal gangue, fly ash, sludge conditioner, straw powder; S2 adds river sludge and sludge conditioner into the mixer in sequence and stirs and mixes for 30 minutes; S3 continues to add waste slag, iron ore tailings, glass waste, perlite powder, coal gangue, fly ash, and straw powder into the mixer, and continues to stir for 1 hour to obtain a mixture; S4 injects the mixed material into a mold and performs pressing to form a brick; The pressing pressure is 22.5MPa; S5: placing the bricks in a drying oven for drying at a temperature of 80°C for 20 hours; S6 sintering the dried bricks to obtain finished permeable bricks; The sintering temperature is 1120°C and the sintering time is 120 min.

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