Device for preparing grey earthenware bricks by using red mud

Abstract

The utility model relates to a device for preparing grey earthenware bricks by using red mud. The device comprises a red mud storage bin; storing the composite blending material in a warehouse; the blanking bin is used for receiving the red mud from the red mud storage bin and the composite admixture from the composite admixture storage bin and conveying a mixture of the red mud and the composite admixture to the belt quantitative feeder; the belt constant feeder is used for conveying a mixture of the red mud and the composite blending material to the powder making device; the powder making device is coupled to the belt constant feeder and used for making the mixture into powder and adding the powder into the green brick forming device; the additive storage tank is positioned above the green brick forming device and is used for quantitatively adding an additive into the green brick forming device; the green brick forming device is used for manufacturing green bricks by using the powder and the additive; and the sintering device is used for sintering the green bricks from the green brick forming device into red mud ash earthenware brick finished products.

Description

Technical Field

[0001] The utility model relates to the technical field of solid waste utilization, in particular to a device for preparing gray pottery bricks by using red mud. Background Art

[0002] The statements in this section are merely intended to provide background information related to the technical solution of the present application to aid understanding, and they do not necessarily constitute prior art for the technical solution of the present application.

[0003] Red mud is a major solid waste generated in the alumina production process. Generally, 1-1.5 tons of red mud are generated for every ton of alumina produced. Due to the alkaline content, fine particles and complex composition of red mud, the comprehensive utilization of red mud has always been a common problem in the green development of the global aluminum industry. The accumulation of a large amount of red mud brings potential environmental and safety risks. The proper disposal of industrial solid wastes such as red mud is an important environmental issue faced by my country's rapid economic development. Therefore, it is urgent to minimize and reduce the harm of red mud, effectively utilize red mud, reduce its volume, make it harmless, resource-based, industrialize it, and turn waste into treasure.

[0004] At present, the comprehensive utilization of red mud mainly includes the following methods: iron selection from red mud, cement admixture, roadbed materials, etc. Because red mud contains alkali and is produced in large quantities, its large-scale and high-value utilization is restricted.

[0005] Gray pottery is a traditional Chinese ceramic product with a long history. Its unique gray color, simple and beautiful appearance, has been widely used in antique buildings and modern decorations, especially gray pottery bricks, which are mostly used for antique building exterior walls, urban gardens, park pavement paving, etc. The main raw materials of gray pottery bricks are loess, clay, shale, etc., and they are highly dependent on natural resources.

[0006] Currently, there is no technology or equipment for preparing gray ceramic bricks using red mud. Utility Model Content

[0007] In order to solve the problem that red mud waste is difficult to utilize in the prior art, one aspect of the utility model relates to a device for preparing gray pottery bricks using red mud, comprising: a red mud storage bin for storing red mud; a composite admixture storage bin for storing composite admixtures; a lower feed bin located below the red mud storage bin and the composite admixture storage bin, for receiving red mud from the red mud storage bin and composite admixtures from the composite admixture storage bin, and conveying a mixture of red mud and composite admixtures to a belt quantitative feeder; a belt quantitative feeder located below the lower feed bin, for conveying a mixture of red mud and composite admixtures to a powder making device; a powder making device coupled to the belt quantitative feeder, for making the mixture into powder and adding it to a brick blank forming device; an additive storage tank located above the brick blank forming device, for quantitatively adding additives to the brick blank forming device; a brick blank forming device, for making brick blanks using the powder and the additives; and a sintering device coupled to the brick blank forming device, for sintering the brick blanks from the brick blank forming device into finished red mud gray pottery bricks.

[0008] In one embodiment, the brick-forming device comprises a double-shaft agitator, a screw extruder, a brick-forming mold, a brick-cutting device, and a roller conveyor, wherein a terminal end of the roller conveyor is coupled to the sintering device.

[0009] In one embodiment, the outlet cross-section of the green brick forming mold is rectangular, and the green brick forming mold has a component capable of adjusting the cross-sectional size of the rectangle.

[0010] In one embodiment, the cutting device comprises a component capable of adjusting the spacing size of the cutting knives.

[0011] In one embodiment, the sintering device is a roller kiln capable of regulating the temperature and heating time of each temperature zone.

[0012] In one embodiment, the temperature zones in the sintering device include a preheating zone, a sintering zone, a reducing zone, and a cooling zone.

[0013] In one embodiment, the reduction zone includes a carbon monoxide sensor for detecting carbon monoxide concentration.

[0014] In one embodiment, the powder making device includes a Raymond mill, a cyclone dust collector, and a bag dust collector.

[0015] In one embodiment, the discharge particle size of the powder of the mixture of red mud and composite admixture in the cyclone dust collector is -160 mesh>75%.

[0016] The beneficial effects of one or more embodiments of the utility model are as follows: in view of the hazards and difficulties in comprehensive utilization of red mud, red mud produced by alumina is used as raw material to prepare sintered gray ceramic bricks, which can effectively utilize the characteristics of solid waste itself, prepare high-value antique building materials, reduce environmental pollution and save land, and create economic benefits, thereby realizing the high-value, full-quantity and resource utilization of red mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The embodiments of the present invention are further described below with reference to the accompanying drawings, wherein:

[0018] Figure 1 A schematic structural diagram of a device for preparing gray ceramic bricks using red mud according to an embodiment is shown;

[0019] Figure 2 A simplified process flow diagram of preparing grey terracotta bricks using red mud according to one embodiment is shown.

[0020] In the figure, 1 is a brick forming device, 1-1 is a double-shaft agitator, 1-2 is a screw extruder, 1-3 is a brick forming mold, 1-4 is a cutting device, 1-5 is a roller conveyor, 2 is an additive storage tank, 3 is a powder making device, 3-1 is a Raymond mill, 3-2 is a cyclone dust collector, 3-3 is a bag type dust collector, 4 is a belt quantitative feeder, 5 is a feed bin, 6 is a red mud storage bin, 7 is a composite admixture storage bin, and 8 is a sintering device. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] Figure 1 The schematic diagram of the structure of a device for preparing gray ceramic bricks using red mud according to one embodiment is shown. It should be noted that: Figure 1 The various components shown in the drawings are only used to illustrate the embodiments, and it does not mean that every component therein is essential to the solution.

[0023] The device for preparing gray pottery bricks using red mud may include: a red mud storage bin 6 for storing red mud produced in the process of producing alumina. A composite admixture storage bin 7 for storing composite admixtures. The composite admixtures may include, for example, loess and / or clay, and the added amount may be 80%-200% of the weight of dry red mud. A lower silo 5, located below the red mud storage bin 6 and the composite admixture storage bin 7, is used to receive red mud from the red mud storage bin 6 and composite admixtures from the composite admixture storage bin 7, and to convey the mixture of red mud and composite admixtures to the belt quantitative feeder 4. The belt quantitative feeder 4, located below the lower silo 5, is used to convey the mixture of red mud and composite admixtures to the powder making device 3. The powder making device 3, which is coupled to the belt quantitative feeder 4, is used to powder the mixture of red mud and composite admixtures, and add the powder to the brick forming device 1. The additive storage tank 2 is located above the brick-blade forming device 1, and is used to quantitatively add additives to the brick-blade forming device 1 to adjust the moisture, alkalinity and phase composition of the mixed powder of red mud and composite admixtures. The additive may include, for example, an aqueous solution of boric acid, and the added amount may be 15%-25% of the weight of the mixed powder of red mud and composite admixtures. The brick-blade forming device 1 is used to make bricks using the powder and the additive. The sintering device 8 is coupled to the brick-blade forming device 1, and is used to finally sinter the bricks from the brick-blade forming device 1 into finished red mud gray ceramic bricks.

[0024] In one embodiment, the brick forming device 1 may include a double-shaft agitator 1-1, a screw extruder 1-2, a brick forming mold 1-3, a cutting device 1-4, and a roller conveyor 1-5, and the end of the roller conveyor 1-5 is coupled to the sintering device 8. The additive storage tank 2 quantitatively adds additives to the double-shaft agitator 1-1. The double-shaft agitator 1-1 is used to mix and stir the mixed powder of red mud and composite admixtures from the powder making device 3 and the additives from the additive storage tank 2. The screw extruder 1-2 is used to extrude the mixed and stirred materials into the brick forming mold 1-3. In one embodiment, the extrusion pressure of the screw extruder 1-3 can be 1.5Mpa-4.5Mpa.

[0025] In one embodiment, the outlet cross-section of the green brick forming mold 1-3 is rectangular, and the green brick forming mold 1-3 has a component capable of adjusting the cross-sectional size of the rectangle, so that the thickness and width of the produced green bricks can be adjusted by adjusting the cross-sectional size of the rectangle.

[0026] In one embodiment, the blank cutting device 1-4 includes a component capable of adjusting the spacing between the blank cutting blades, so that the length of the blank can be adjusted by adjusting the spacing between the blank cutting blades. The blank cutting pressure of the blank cutting device 1-4 can be 0.5Mpa-2Mpa.

[0027] In one embodiment, the powder making device 3 includes a Raymond mill 3-1, a cyclone dust collector 3-2, and a bag dust collector 3-3. The belt quantitative feeder 4 is used to convey the mixture of red mud and composite admixture to the Raymond mill 3-1 of the powder making device 3, and the Raymond mill 3-1 grinds the mixture.

[0028] In one embodiment, the discharge particle size of the powder of the mixture of red mud and composite admixture in the cyclone dust collector 3 - 2 of the powder making device 3 is -160 mesh>75%.

[0029] In one embodiment, the sintering device 8 is a roller kiln. In one embodiment, the roller kiln includes a preheating zone, a firing zone, a reduction zone, and a cooling zone, and the temperature and heating time of each temperature zone can be adjusted. In one embodiment, the preheating zone temperature is 25°C-450°C, the firing zone temperature is 450°C-1200°C, the reduction zone temperature is 1200°C-950°C, the carbon monoxide (CO) content range is 0.5%-4.0%, and the cooling zone temperature is 950°C-75°C. In one embodiment, the reduction zone includes a carbon monoxide sensor for detecting the carbon monoxide concentration.

[0030] In one embodiment, the additive storage tank 2 quantitatively adds additives to the brick forming device 1 or the dual-shaft agitator 1-1 therein, and the added amount may be 15%-25% of the weight of the mixed powder of red mud and the composite admixture.

[0031] Figure 2 A simplified process flow diagram of preparing gray terracotta bricks using red mud according to one embodiment is shown, and the process may include the following steps:

[0032] (1) Red mud with a moisture content of less than 10% and a composite admixture (the composite admixture may include, for example, loess and / or clay, and the addition amount is 80%-200% of the weight of the dry red mud) are fed into a lower hopper, and then fed into a Raymond mill of a powder making device via a belt quantitative feeder for grinding to obtain a mixed powder of red mud and the composite admixture with a particle size of -160 mesh>75%.

[0033] (2) The mixed powder of red mud and composite admixtures is collected by a cyclone dust collector of a powder making device and then sent to a twin-shaft agitator of a brick forming device, and then additives (for example, a boric acid aqueous solution, the added amount of which is 15%-25% of the weight of the mixed powder of red mud and composite admixtures) are added to adjust the moisture content, alkalinity and phase composition of the mixed powder to produce a mud material with a certain plasticity.

[0034] (3) The mud material is fed into a screw extruder of a brick forming device, and is pressure-formed into a rectangular mud blank by a brick forming mold, and then fed into a blank cutting machine via a roller conveyor for blank cutting to obtain gray ceramic brick blanks of a certain size.

[0035] (4) The gray ceramic brick blanks are sent to the roller kiln for sintering. The gray ceramic brick blanks are passed through the preheating zone, firing zone, reduction zone, and cooling zone in the roller kiln to obtain the finished red mud gray ceramic bricks. In the preheating zone, the attached water and crystallization water in the gray ceramic brick blanks are removed; in the firing zone, the alkali and composite admixtures in the red mud of the gray ceramic brick blanks generate a certain amount of liquid products with high viscosity under the action of additives, which improve the density and strength of the red mud gray ceramic brick body; in the reduction zone, the ferric oxide in the red mud of the gray ceramic brick blanks is reduced to ferrous oxide, showing an iron gray color; the liquid products generated at high temperature in the cooling zone are converted into glass phase products due to rapid cooling, which solidify the alkali in the red mud in the brick body, effectively inhibiting the frosting of the brick body, thereby realizing the high value, full quantification, and resource utilization of red mud.

[0036] In one embodiment, the preheating zone temperature is 25°C-450°C, the firing zone temperature is 450°C-1200°C, the reduction zone temperature is 1200°C-950°C, the CO content range is 0.5%-4.0%, and the cooling zone temperature is 950°C-75°C.

[0037] The scheme uses a red mud preparation device for gray pottery bricks, grinds red mud and composite admixtures into a mixed powder of a certain particle size through a powder making device, adds additives to adjust the moisture, alkalinity and phase composition of the mixed raw materials, and then sinters the gray pottery brick blanks in a molding device. In a high-temperature reducing atmosphere, the gray pottery brick blanks reduce the ferric oxide in the red mud to ferrous oxide, showing an iron gray color; under the action of additives, the red mud and composite admixtures cause the alkali in the red mud to generate a glass phase product that solidifies in the brick body, effectively inhibiting the frost of the brick body, while improving the density and strength of the gray pottery bricks. The scheme makes full use of the characteristics of red mud containing iron oxide and silicate components, fine particle size, and soft texture, which can be used as raw materials for antique sintered building materials. The antique building materials produced can be used in antique buildings, urban garden landscapes, park road paving, etc., making full use of red mud solid waste resources, realizing the high-value, full-quantity, and resource utilization of red mud, reducing solid waste storage, protecting arable land, and having broad application prospects.

[0038] Obviously, the above embodiments are only some embodiments of the present utility model, rather than all embodiments. The above embodiments are only used to explain the present utility model and do not constitute a limitation on the protection scope of the present utility model. Based on the above embodiments, all other embodiments obtained by those skilled in the art without making creative work, that is, all modifications, equivalent substitutions and improvements made within the spirit and principles of the present application, fall within the protection scope required by the present utility model.

[0039] References herein to "various embodiments", "some embodiments", "one embodiment", or "an embodiment" refer to specific features, structures, or properties described in conjunction with the embodiment being included in at least one embodiment. Therefore, the phrases "in various embodiments", "in some embodiments", "in one embodiment", or "in an embodiment" appearing throughout the present invention do not necessarily refer to the same embodiment. In addition, specific features, structures, or properties may be combined in any suitable manner in one or more embodiments. Therefore, specific features, structures, or properties shown or described in conjunction with one embodiment may be combined in whole or in part with features, structures, or properties of one or more other embodiments without restriction, as long as the combination is not illogical or inoperable. Expressions similar to "according to A", "based on A", "through A", or "using A" appearing herein are intended to be non-exclusive, that is, "according to A" may cover "according to A only" or "according to A and B", unless it is specifically stated that its meaning is "according to A only". In this application, for the sake of clarity, some exemplary operating steps are described in a certain order, but those skilled in the art will understand that each of these operating steps is not essential, and some of the steps may be omitted or replaced by other steps. These operation steps do not have to be executed sequentially in the manner shown; on the contrary, some of these operation steps can be executed in different orders or in parallel according to actual needs, as long as the new execution manner is not illogical or inoperable.

Claims

1. A device for preparing gray pottery bricks using red mud, characterized in that: include: A red mud storage silo (6), used for storing red mud; A composite admixture storage bin (7) for storing the composite admixture; The lower material bin (5) is located below the red mud storage bin (6) and the composite admixture storage bin (7), and is used to receive the red mud from the red mud storage bin (6) and the composite admixture from the composite admixture storage bin (7), and to convey the mixture of the red mud and the composite admixture to the belt quantitative feeder (4); A belt quantitative feeder (4), located below the lower hopper (5), is used to convey a mixture of red mud and composite admixtures to the powder making device (3); A powder making device (3) coupled to a belt quantitative feeder (4) for making the mixed material into powder and adding the powder to the brick forming device (1); An additive storage tank (2), located above the brick forming device (1), and used for quantitatively adding additives into the brick forming device (1); A brick forming device (1) for making bricks using the powder and the additive; as well as The sintering device (8) is coupled to the brick forming device (1) and is used to sinter the bricks from the brick forming device (1) into finished red mud terracotta bricks.

2. The device according to claim 1, wherein: The brick forming device (1) comprises a double-shaft stirrer (1-1), a screw extruder (1-2), a brick forming mold (1-3), a brick cutting device (1-4), and a roller conveyor (1-5), wherein the end of the roller conveyor (1-5) is coupled to the sintering device (8).

3. The device according to claim 2, wherein: The outlet cross section of the green brick forming mould (1-3) is rectangular, and the green brick forming mould (1-3) has a component capable of adjusting the cross-sectional size of the rectangle.

4. The device according to claim 2, wherein: The blank cutting device (1-4) comprises a component capable of adjusting the spacing size of the blank cutting knives.

5. The device according to claim 1, wherein: The sintering device (8) is a roller kiln capable of regulating the temperature and heating time of each temperature zone.

6. The device according to claim 5, wherein: The temperature zones in the sintering device (8) include a preheating zone, a sintering zone, a reducing zone, and a cooling zone.

7. The device according to claim 6, wherein: The reduction zone includes a carbon monoxide sensor for detecting the concentration of carbon monoxide.

8. The device according to claim 1, wherein: The powder making device (3) comprises a Raymond mill (3-1), a cyclone dust collector (3-2), and a bag-type dust collector (3-3).

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