Method for producing lightweight concrete block for wall by using vanadium-titanium slag

Abstract

The invention discloses a method for producing a lightweight concrete block for a wall by adopting vanadium-titanium slag, belongs to the technical field of preparation of building materials, and aims to solve the problems that the preparation process of the lightweight concrete block is complicated and the cost is difficult to control in the prior art. The method comprises the following steps: grinding the vanadium-titanium slag and a grinding aid in a ball mill; adding the cement, the lime, the gypsum, the aluminum powder, the foam stabilizer and the vanadium-titanium slag into a stirrer for mixing and stirring to obtain mixed powder; mixing aluminum powder and a foam stabilizer, and then adding water to obtain turbid liquid; mixing and stirring the mixed powder and water to obtain uniform slurry, adding the turbid liquid, and continuously stirring, so that the aluminum powder is uniformly dispersed in the slurry; pouring the slurry into a mold, and standing for gas generation to obtain a green body; and cutting the green body to obtain the lightweight concrete block. The method can be used for producing lightweight concrete blocks for walls.

Description

Technical Field

[0001] The invention belongs to the technical field of building material preparation, and in particular relates to a method for producing lightweight concrete blocks for walls by using vanadium-titanium slag. Background Art

[0002] Lightweight concrete blocks offer excellent properties such as lightness, thermal insulation, heat insulation, and sound insulation, making them an ideal new wall material and widely used in the construction industry. Vanadium-titanium slag is a solid waste generated during the smelting of vanadium-titanium magnetite. Large accumulations of this waste not only occupy land resources but also pose a risk of environmental pollution.

[0003] At present, although there have been attempts to apply slag to building materials, when vanadium-titanium slag is used to produce lightweight concrete blocks, its potential value cannot be fully realized due to the low utilization rate of vanadium-titanium slag in the processing process. In addition, the preparation process is complicated and the cost is difficult to control. Summary of the Invention

[0004] In view of the above analysis, the present invention aims to provide a method for producing lightweight concrete blocks for walls using vanadium-titanium slag, so as to solve the problems in the prior art of complex preparation process and difficult cost control of lightweight concrete blocks.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions.

[0006] The present invention provides a method for producing lightweight concrete blocks for walls using vanadium-titanium slag, comprising the following steps:

[0007] Step 1: Weighing raw materials, the raw materials comprising vanadium-titanium slag, cement, lime, gypsum, aluminum powder and foam stabilizer;

[0008] Step 2: Put the vanadium-titanium slag and grinding aid into a ball mill for grinding;

[0009] Step 3: adding cement, lime, gypsum, aluminum powder, foam stabilizer, and the vanadium-titanium slag obtained in step 2 into a mixer and mixing to obtain a mixed powder;

[0010] Aluminum powder and a foam stabilizer are mixed and then water is added to obtain a suspension;

[0011] Step 4: After mixing the mixed powder and water to obtain a uniform slurry, add the suspension and continue stirring to ensure that the aluminum powder is evenly dispersed in the slurry;

[0012] Step 5: Pour the slurry obtained in step 4 into a mold and let it stand to generate gas, so that the slurry expands to form a green body with uniform pores;

[0013] Step 6: Cut the blank to obtain lightweight concrete blocks.

[0014] Furthermore, in step 1, the particle size of the vanadium-titanium slag is less than 0.15 mm.

[0015] Furthermore, in step 1, the cement is silicate cement with a strength grade of not less than 42.5.

[0016] Furthermore, in step 1, the effective calcium oxide content of the lime is not less than 80%.

[0017] Furthermore, in step 2, the mass ratio of the grinding aid to the vanadium-titanium slag is 3 to 5:100.

[0018] Furthermore, in step 3, dry mixing is performed for 3 to 5 minutes.

[0019] Furthermore, in step 4, the mass ratio of the mixed powder to water is 40-50:100.

[0020] Furthermore, in step 5, the temperature for standing and generating gas is 20°C to 30°C.

[0021] Furthermore, in step 5, the relative humidity is 60% to 80%.

[0022] Furthermore, the standing time for gas generation is 1 hour to 2 hours.

[0023] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0024] A) The method for producing lightweight concrete blocks for walls provided by the present invention uses vanadium-titanium slag as the main raw material, and uses low-cost vanadium-titanium slag to replace part of traditional raw materials. This not only effectively solves the environmental problems caused by the accumulation of vanadium-titanium slag, but also realizes the resource utilization of industrial solid waste, improves resource utilization, and effectively reduces the production cost of lightweight concrete blocks.

[0025] B) The method for producing lightweight concrete blocks for walls provided by the present invention can increase the activity of the vanadium-titanium slag and improve its compatibility with other raw materials by grinding the vanadium-titanium slag.

[0026] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages will become apparent from the description or be understood through practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the embodiments of the description and the contents particularly pointed out in the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0028] Figure 1 A flow chart of a method for producing lightweight concrete blocks for walls using vanadium-titanium slag provided in Example 1 of the present invention;

[0029] Figure 2 A schematic structural diagram of a slag casting mold when spray cooling medium-titanium type blast furnace slag with a slag crust on the surface in the method for producing lightweight concrete blocks for walls using vanadium-titanium slag provided in Example 1 of the present invention;

[0030] Figure 3 This is a schematic structural diagram of a slag mold when demoulding solid slag blocks in a method for producing lightweight concrete blocks for walls using vanadium-titanium slag provided in Example 1 of the present invention.

[0031] Reference numerals:

[0032] 1-Mold cavity; 2-Coolant circulation pipe; 3-Baffle inside the pipe; 4-Coolant supply unit; 5-Coolant connecting pipe; 6-Water supply magnetic sleeve; 7-Water supply magnetic ring; 8-Discharge plate; 9-Longitudinal motor; 10-Rotating magnetic sleeve; 11-Rotating magnetic ring. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0034] The present invention provides a method for producing lightweight concrete blocks for walls using vanadium-titanium slag. Figure 1 , including the following steps:

[0035] Step 1: weighing raw materials in proportion, wherein the raw materials include vanadium-titanium slag, cement, lime, gypsum, aluminum powder and a foam stabilizer (e.g., sodium dodecylbenzene sulfonate);

[0036] Step 2: placing the vanadium-titanium slag and the grinding aid into a ball mill for grinding to improve the activity of the vanadium-titanium slag;

[0037] Step 3: Add cement, lime, gypsum, aluminum powder, foam stabilizer, and the vanadium-titanium slag obtained in step 2 into a mixer and mix them for 3 to 5 minutes to obtain a mixed powder.

[0038] Aluminum powder and a foam stabilizer are mixed and then water is added to obtain a suspension;

[0039] Step 4: After mixing the mixed powder and water for 4 to 7 minutes to obtain a uniform slurry, add the suspension and continue stirring for 1 to 2 minutes to ensure that the aluminum powder is evenly dispersed in the slurry. The mass ratio of the mixed powder to water is 40 to 50:100.

[0040] Step 5: Pour the slurry obtained in step 4 into a mold and let it stand to generate gas, so that the slurry expands to form a green body with uniform pores;

[0041] Step 6: Use a cutting machine to cut the green body into required sizes to obtain green body blocks of predetermined specifications.

[0042] Compared with the prior art, the method of producing lightweight concrete blocks for walls of the present invention, on the one hand, adopts vanadium-titanium slag as the main raw material, and uses low-priced vanadium-titanium slag to replace part of the traditional raw materials. It can not only effectively solve the environmental problems caused by the accumulation of vanadium-titanium slag, realize the resource utilization of industrial solid waste, improve resource utilization rate, but also effectively reduce the production cost of lightweight concrete blocks.

[0043] On the other hand, grinding the vanadium-titanium slag can increase the activity of the vanadium-titanium slag and improve its compatibility with other raw materials.

[0044] For example, in order to ensure the strength of lightweight concrete blocks, in the above step 1, the composition of the raw materials includes 50 to 70 parts by mass of vanadium-titanium slag, 15 to 25 parts of cement, 10 to 20 parts of lime, 3 to 8 parts of gypsum, 0.05 to 0.15 parts of aluminum powder and 0.01 to 0.05 parts of foam stabilizer.

[0045] The particle size of the vanadium-titanium slag is less than 0.15 mm, the cement is silicate cement with a strength grade of not less than 42.5, and the effective calcium oxide content of the lime is not less than 80%.

[0046] In this way, through reasonable raw material ratio, the prepared lightweight concrete blocks have good pore structure, compressive strength reaches 5MPa to 8MPa, thermal conductivity coefficient is lower than 0.15W / (m·K), and thermal insulation performance is excellent.

[0047] In order to reduce the ferromagnetic impurity content in the vanadium-titanium slag and improve the quality of the lightweight concrete blocks, the following steps are further included between step 1 and step 2:

[0048] The vanadium-titanium slag is subjected to magnetic separation to remove ferromagnetic impurities in the vanadium-titanium slag.

[0049] In order to further improve the surface activity of vanadium-titanium slag, for example, in the above step 2, the mass ratio of the grinding aid to the vanadium-titanium slag is 3 to 5:100, the grinding aid comprises triethanolamine and ethylene glycol, the mass ratio of the two is 1 to 1.5:2, the grinding time is 3h to 5h, and the specific surface area of ​​the vanadium-titanium slag after grinding is 400m 2 / kg~500m 2 / kg.

[0050] Illustratively, in the above step 5, the temperature for standing and gas generation is 20° C. to 30° C., the relative humidity is 60% to 80%, and the standing and gas generation time is 1 hour to 2 hours.

[0051] In order to ensure the stability of the green body, the following steps are further included after step 6:

[0052] Step 7: Place the green body into an autoclave, increase the pressure to 1.2 MPa to 1.5 MPa at a rate of 0.1 MPa / h to 0.2 MPa / h, and maintain the pressure for 6 to 8 hours for autoclave curing.

[0053] Step 8: Reduce the pressure to normal pressure at a rate of 0.1 MPa / h to 0.2 MPa / h, take the green blocks out of the autoclave, and obtain concrete blocks.

[0054] It is understandable that in order to obtain vanadium-titanium slag, the following steps are further included before step 1:

[0055] Step a: Directly directing the liquid medium titanium type blast furnace slag discharged from the blast furnace into a slag casting mold;

[0056] Step b: air-cooling the medium-titanium blast furnace slag in the slag casting mold for 3 to 5 minutes to form a slag shell on the surface of the liquid medium-titanium blast furnace slag in the slag casting mold. The thickness of the slag shell is 20 to 35 mm, which serves as an isolation layer. The interior of the medium-titanium blast furnace slag in the slag casting mold is still liquid blast furnace slag. Limiting the thickness of the slag shell within the above range can ensure that the slag shell has a certain mechanical strength and will not soften during the subsequent temperature return process. At the same time, it can withstand the spraying force generated by the spraying in the subsequent spraying process, ensuring that the slag shell will not break, and preventing the spray water from directly contacting the liquid blast furnace slag.

[0057] Step c: spray cooling the medium titanium type blast furnace slag with a slag shell on the surface for 30 to 60 minutes, so that the liquid blast furnace slag inside the medium titanium type blast furnace slag in the slag casting mold is completely solidified to obtain a solid slag block;

[0058] Step d: crushing the solid slag to obtain vanadium-titanium slag.

[0059] In this way, on the one hand, by adopting the method of air cooling combined with spray cooling, dense and high-strength vanadium-titanium slag can be obtained. Specifically, the specific heat capacity of air is small (about 1 kJ / kg·K), and there is no phase change. It mainly relies on convection heat transfer and has a slow cooling rate. Air cooling is a slow cooling method, which can promote crystallization on the surface of the medium-titanium blast furnace slag in the slag casting mold to form a slag shell, avoiding thermal stress and causing the slag shell to rupture. This slag shell can serve as an isolation layer to prevent the subsequent spray cooling water from directly contacting the liquid medium-titanium blast furnace slag in the slag casting mold to produce water-quenched slag (lower strength and more pores), thereby ensuring the density and high strength of the obtained vanadium-titanium slag.

[0060] On the other hand, water has a large specific heat capacity (4.18 kJ / kg·K) and a fast heat transfer rate, which can quickly reduce the temperature of liquid blast furnace slag. Spray cooling is a fast cooling method. Through spray cooling, effective heat transfer can be achieved between the spray cooling water and the liquid medium-titanium blast furnace slag below the slag shell through the slag shell. With the slag shell as the base layer, crystallization layers are formed layer by layer downward, ensuring the uniform crystallization of the formed solid slag block, thereby ensuring the density and high strength of the obtained vanadium-titanium slag.

[0061] On the other hand, the liquid medium-titanium type blast furnace slag discharged from blast furnace 6 is directly poured into the slag casting mold, and then the subsequent processing process is directly carried out. There is no need to transport the high-temperature liquid medium-titanium type blast furnace slag, which can effectively improve the processing safety of the liquid medium-titanium type blast furnace slag and simplify the processing process.

[0062] Considering that spray cooling can only transfer heat from the top of the slag casting mold through the slag shell and the liquid blast furnace slag inside the medium titanium type blast furnace slag in the slag casting mold, it may cause the liquid blast furnace slag inside the medium titanium type blast furnace slag to cool slowly and have poor cooling uniformity. Therefore, for the structure of the slag casting mold, specifically, it includes a mold cavity 1, a coolant circulation pipe 2 and a pipe inner baffle 3, see Figure 2 The coolant circulation pipe 2 is arranged in the mold cavity 1 and is axially perpendicular to the bottom wall of the mold cavity 1. For example, the axial direction of the coolant circulation pipe 2 is arranged in the vertical direction, the top of the coolant circulation pipe 2 is closed, and the bottom is open. The inner baffle 3 is arranged in the coolant circulation pipe 2 and is arranged along the axial direction of the coolant circulation pipe 2. There is a gap between the top of the inner baffle 3 and the top of the coolant circulation pipe 2, and the heat straight pipe is divided into a liquid inlet rectangular pipe, a top connecting pipe and a liquid outlet rectangular pipe connected in sequence.

[0063] In this way, while spray cooling is being carried out, cooling water is supplied to the coolant circulation pipe 2, and the cooling water flows through the liquid inlet rectangular pipe, the top connecting pipe and the liquid outlet rectangular pipe, and transfers heat through the pipe wall of the coolant circulation pipe 2 and the liquid vanadium-titanium smelting slag inside the medium-titanium type vanadium-titanium smelting slag in the forming mold. At the same time, the spray water transfers heat through the slag shell and the liquid vanadium-titanium smelting slag inside the medium-titanium type vanadium-titanium smelting slag in the forming mold, thereby realizing simultaneous heat exchange from the surface and interior of the liquid vanadium-titanium smelting slag, thereby improving the cooling uniformity and cooling efficiency.

[0064] It can be understood that in order to supply cooling water to the coolant circulation pipe 2, the above-mentioned equipment also includes a coolant supply unit 4 and a coolant connecting pipe 5. The coolant connecting pipe 5 includes a symmetrically arranged water supply rectangular pipe and a drainage rectangular pipe. The water supply rectangular pipe and the drainage rectangular pipe constitute a rectangular coolant connecting pipe 5. The liquid inlet end of the water supply rectangular pipe is connected to the water outlet of the coolant supply unit 4, the liquid outlet end of the water supply rectangular pipe is sealed with the liquid inlet rectangular pipe, the liquid inlet end of the drainage rectangular pipe is sealed with the liquid outlet rectangular pipe, and the liquid outlet end of the drainage rectangular pipe is connected to the water inlet of the coolant supply unit 4.

[0065] In order to avoid water leakage during the water supply process, the above-mentioned equipment also includes a water supply magnetic sleeve 6 and a water supply magnetic ring 7. The bottom of the coolant circulation pipe 2 protrudes from the bottom of the mold cavity 1, and the water supply magnetic ring 7 is arranged at the bottom of the mold cavity 1. The bottom of the coolant circulation pipe 2 passes through the bottom of the mold cavity 1 and the water supply magnetic ring 7 and protrudes from the water supply magnetic ring 7. The water supply sealing sleeve is sleeved on the outer wall of the coolant connecting pipe 5 and is slidably connected to the coolant connecting pipe 5.

[0066] When the forming mold moves to the bottom of the spray unit, the position of the coolant circulation pipe 2 corresponds to the position of the coolant connecting pipe 5, and the water supply magnetic sleeve 6 is energized and magnetically attracted to the water supply magnetic ring 7, so that the water supply magnetic sleeve 6 moves toward the coolant circulation pipe 2 and is sleeved on the connection between the coolant circulation pipe 2 and the coolant connecting pipe 5, realizing a sealed connection between the two and avoiding water leakage during the water supply process.

[0067] To facilitate demoulding of solid slag, see Figure 3 The coolant circulation pipe 2 can be used to achieve rapid demolding of the solid slag block. Specifically, the inner cavity of the forming mold is in the shape of a cube, the outer wall of the coolant circulation pipe 2 is a threaded structure, and the outer wall of the threaded structure is cylindrical. The above-mentioned discharge unit includes a discharge plate 8 and a discharge reciprocating motor, and the output end of the discharge reciprocating motor is connected to the discharge plate 8.

[0068] When demolding and unloading are required, the coolant circulation pipe 2 is rotated. Due to the existence of the threaded structure and the internal limit of the inner cavity of the forming mold cube, the solid slag block can only move upward, thereby detaching from the inner cavity of the forming mold and realizing demolding. Then, the unloading reciprocating motor is turned on, and the unloading reciprocating motor drives the unloading plate 8 to push the solid slag block away from the top of the forming mold, so that the solid slag block falls into the crushing assembly for crushing.

[0069] It can be understood that in order to drive the rotation of the coolant circulation pipe 2, the above-mentioned equipment also includes a longitudinal motor 9. When the forming mold moves to the top of the discharge unit, the output shaft of the longitudinal motor 9 is fixedly connected to the bottom of the coolant circulation pipe 2, and the longitudinal motor 9 is used to drive the coolant circulation pipe 2 to rotate, thereby realizing the demolding of the solid slag block.

[0070] In order to avoid interference with the output shaft of the longitudinal motor 9 during the movement of the forming mold, the above-mentioned equipment also includes a rotating magnetic sleeve 10 and a rotating magnetic ring 11. It should be noted that the water supply magnetic ring 7 and the rotating magnetic ring 11 can both be the same annular structure. The magnetic sleeve is sleeved on the outer wall of the output shaft of the longitudinal motor 9 and is slidably connected to the output shaft. The cross-sectional shape of the inner wall of the magnetic sleeve and the cross-sectional shape of the output shaft of the longitudinal motor 9 are both rectangular. In this way, when the forming mold moves to the bottom of the discharge unit, the position of the coolant circulation pipe 2 corresponds to the position of the output shaft of the longitudinal motor 9, and the rotating magnetic sleeve 10 is energized, and magnetic attraction occurs with the rotating magnetic ring 11, causing the rotating magnetic sleeve 10 to move toward the coolant circulation pipe 2 and sleeved on the bottom of the coolant circulation pipe 2, thereby achieving a fixed connection between the coolant circulation pipe 2 and the output shaft of the longitudinal motor 9.

[0071] Example 1

[0072] Raw material preparation: weigh 50 parts of vanadium-titanium slag, 25 parts of cement, 15 parts of lime, 5 parts of gypsum, 0.1 parts of aluminum powder, and 0.03 parts of foam stabilizer by mass; among them, the particle size of vanadium-titanium slag is less than 0.15mm, the cement is 42.5 grade Portland cement, and the effective calcium oxide content of lime is 82%.

[0073] Pretreatment of vanadium-titanium slag: Magnetic separation is performed on the vanadium-titanium slag to remove ferromagnetic impurities; the vanadium-titanium slag after magnetic separation is placed in a ball mill, and a grinding aid (triethanolamine and ethylene glycol mass ratio of 1:2) accounting for 3% of the mass of the vanadium-titanium slag is added, and the slag is ground for 3 hours to make its specific surface area reach 400m 2 / kg.

[0074] Raw material mixing: add the pretreated vanadium-titanium slag, cement, lime and gypsum into a mixer and dry mix for 3 minutes, then add 40% of the total mass of the materials into water and stir for 5 minutes to make a slurry.

[0075] Treatment of aluminum powder and foam stabilizer: Mix aluminum powder and foam stabilizer, add water to make a suspension, add it 1 minute before the slurry stirring is completed, and continue stirring for 1 minute.

[0076] Pouring and gasification: Pour the slurry into the mold and let it stand for 1 hour at a temperature of 20°C and a relative humidity of 60% to gasify.

[0077] Cutting: After the gasification is completed, the blank is cut according to the specifications.

[0078] Autoclave curing: The green body was placed in an autoclave, where the pressure was increased at a rate of 0.1 MPa / h to 1.2 MPa, maintained for 6 hours, and then reduced at a rate of 0.1 MPa / h. The resulting lightweight concrete blocks were tested to have a compressive strength of 5.2 MPa and a thermal conductivity of 0.14 W / (m·K).

[0079] Example 2

[0080] Raw material preparation: weigh 60 parts of vanadium-titanium slag, 20 parts of cement, 12 parts of lime, 6 parts of gypsum, 0.12 parts of aluminum powder, and 0.04 parts of foam stabilizer by mass; the raw material specifications are the same as those in Example 1. Pretreatment of vanadium-titanium slag: After magnetic separation, add a grinding aid accounting for 4% of the mass of vanadium-titanium slag and grind for 4 hours until the specific surface area reaches 450m 2 / kg.

[0081] Raw material mixing: dry mix for 4 minutes, add water (45% of the total mass of the material) and stir for 6 minutes

[0082] Aluminum powder and foam stabilizer treatment: same as in Example 1.

[0083] Pouring and gasification: Let it stand for 1.5 hours in an environment with a temperature of 25°C and a relative humidity of 70% to generate gas.

[0084] Cutting: Cut the blank according to specifications.

[0085] Autoclave curing: Increase the pressure at a rate of 0.15 MPa / h to 1.3 MPa, maintain for 7 hours, and remove the blocks after reducing the pressure. Testing has shown that the blocks have a compressive strength of 6.5 MPa and a thermal conductivity of 0.13 W / (m·K).

[0086] Example 3

[0087] Raw material preparation: weigh 70 parts of vanadium-titanium slag, 15 parts of cement, 10 parts of lime, 8 parts of gypsum, 0.15 parts of aluminum powder, and 0.05 parts of foam stabilizer, by mass; the raw material specifications are the same as those in Example 1.

[0088] Pretreatment of vanadium-titanium slag: After magnetic separation, add grinding aid accounting for 5% of the mass of vanadium-titanium slag and grind for 5 hours until the specific surface area reaches 500m 2 / kg.

[0089] Raw material mixing: dry mix for 5 minutes, add water (50% of the total mass of the material) and stir for 8 minutes.

[0090] Aluminum powder and foam stabilizer treatment: same as in Example 1.

[0091] Pouring and gasification: Let it stand for 2 hours at a temperature of 30°C and a relative humidity of 80% to generate gas.

[0092] Cutting: Cut the blank according to specifications.

[0093] Autoclave curing: Increase the pressure at a rate of 0.2 MPa / h to 1.5 MPa, maintain for 8 hours, and remove after reducing the pressure. Testing shows that the block has a compressive strength of 7.8 MPa and a thermal conductivity of 0.12 W / (m·K).

[0094] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A method for producing lightweight concrete blocks for walls using vanadium-titanium slag, characterized in that: The steps include: Step 1: weighing raw materials, wherein the raw materials include vanadium-titanium slag, cement, lime, gypsum, aluminum powder and foam stabilizer; Step 2: Put the vanadium-titanium slag and grinding aid into a ball mill for grinding; Step 3: adding cement, lime, gypsum, aluminum powder, foam stabilizer, and the vanadium-titanium slag obtained in step 2 into a mixer and mixing to obtain a mixed powder; Aluminum powder and a foam stabilizer are mixed and then water is added to obtain a suspension; Step 4: After mixing the mixed powder and water to obtain a uniform slurry, add the suspension and continue stirring to ensure that the aluminum powder is evenly dispersed in the slurry; Step 5: Pour the slurry obtained in step 4 into a mold and let it stand to generate gas, so that the slurry expands to form a green body with uniform pores; Step 6: Cut the blank to obtain lightweight concrete blocks.

2. The method for producing lightweight concrete blocks for walls using vanadium-titanium slag according to claim 1, characterized in that: In step 1, the particle size of the vanadium-titanium slag is less than 0.15 mm.

3. The method for producing lightweight concrete blocks for walls using vanadium-titanium slag according to claim 1, characterized in that: In step 1, the cement is silicate cement with a strength grade of not less than 42.

5.

4. The method for producing lightweight concrete blocks for walls using vanadium-titanium slag according to claim 1, characterized in that: In step 1, the effective calcium oxide content of the lime is not less than 80%.

5. The method for producing lightweight concrete blocks for walls using vanadium-titanium slag according to claim 1, characterized in that: In the step 2, the mass ratio of the grinding aid to the vanadium-titanium slag is 3 to 5:

100.

6. The method for producing lightweight concrete blocks for walls using vanadium-titanium slag according to claim 1, characterized in that: In step 3, dry mixing is performed for 3 to 5 minutes.

7. The method for producing lightweight concrete blocks for walls using vanadium-titanium slag according to claim 1, characterized in that: In step 4, the mass ratio of the mixed powder to water is 40-50:

100.

8. The method for producing lightweight concrete blocks for walls using vanadium-titanium slag according to claim 1, characterized in that: In step 5, the temperature for standing and generating gas is 20° C. to 30° C.

9. The method for producing lightweight concrete blocks for walls using vanadium-titanium slag according to claim 1, characterized in that: In step 5, the relative humidity is 60% to 80%.

10. The method for producing lightweight concrete blocks for walls using vanadium-titanium slag according to claim 1, characterized in that: The static gasification time is 1h to 2h.

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