阅读说明：本技术 一种建筑模板用镁合金材料及制备方法 (Magnesium alloy material for building template and preparation method thereof ) 是由 黄小波 崔建忠 房中学 赵宏胜 于 2021-10-21 设计创作，主要内容包括：本发明属于建筑模板领域,尤其是一种建筑模板用镁合金材料及制备方法,其镁合金材料包括以下质量分数的原料：0.25-0.6％Ca、0.25-0.5％Y、0.35-0.8％Sn、0.1-0.5％Sr,其余为AZ41；其制备方法包括以下步骤：S1、熔化：在干净坩埚内对镁合金进行加热熔化,制得镁液,本发明改良了在精炼过程中加入细化剂的情况,提高了精炼细化剂的效果,两次精炼过程中进行充分的捞渣,镁液更干净,减少埚底的熔剂渣,浇注后的产品更干净,不容易带入熔剂夹渣,有利于提高产品的抗腐蚀性能,制备方法工艺简单、可靠、经济、且易于推广应用。(The invention belongs to the field of building templates, and particularly relates to a magnesium alloy material for a building template and a preparation method thereof, wherein the magnesium alloy material comprises the following raw materials in percentage by mass: 0.25-0.6% of Ca, 0.25-0.5% of Y, 0.35-0.8% of Sn, 0.1-0.5% of Sr and the balance of AZ 41; the preparation method comprises the following steps: s1, melting: the invention improves the condition of adding the refiner in the refining process, improves the effect of refining the refiner, fully drags slag in the two refining processes, makes the magnesium liquid cleaner, reduces the flux slag at the crucible bottom, makes the poured product cleaner, is not easy to bring the flux to clamp slag, is beneficial to improving the corrosion resistance of the product, and has simple, reliable, economic and easy popularization and application.)

1. The magnesium alloy material for the building template is characterized by comprising the following raw materials in percentage by mass: 0.25-0.6% of Ca, 0.25-0.5% of Y, 0.35-0.8% of Sn, 0.1-0.5% of Sr and the balance of AZ 41.

2. The preparation method of the magnesium alloy material for the building template is characterized by comprising the following steps of:

s1, melting: heating and melting the magnesium alloy in a clean crucible to prepare magnesium liquid;

s2, alloying: adding aluminum ingot and zinc ingot alloy elements, heating to 730-740 ℃, simultaneously uniformly scattering anhydrous manganese chloride on the liquid surface, and stirring by using a stirrer or argon gas after the anhydrous manganese chloride forms a hard shell to completely melt the anhydrous manganese chloride;

s3, refining: refining for the first time, namely scattering a refining agent by using a stirrer or argon while stirring, wherein the scattering amount of the prepared refining agent is 75 percent;

s4, slag removal and secondary refining: the preheated slag ladle is used for fishing the slag, refining is carried out again after the slag is fished, the previous refining process is repeated, and the residual refining agent is uniformly scattered into the magnesium liquid to complete secondary refining;

s5, after refining, respectively adding magnesium-yttrium master alloy, tin ingot and magnesium-calcium master alloy, carrying out homogenization stirring, then carrying out high-temperature standing for 45 minutes at 740-745 ℃, then carrying out low-temperature 635-650 ℃ deferrization, and heating to the pouring temperature 710-720 ℃;

s6, in the casting process, a wire feeder is used for feeding the pure metal strontium strip serving as the grain refiner into a pipette through a small opening on the pipette;

and S7, homogenizing the bar after the casting is finished.

3. The preparation method of the magnesium alloy material for the building template according to claim 2, wherein in S1, 15-20kg of 2# flux is uniformly put at the bottom of a clean crucible, and the electric heating or air-feeding heating is carried out, wherein the temperature of a power distribution cabinet of the furnace is 950 ℃, and the temperature of the molten magnesium is 660-680 ℃.

4. The method for preparing a magnesium alloy material for a building template according to claim 2, wherein in S2, after the furnace charge is completely melted, a stirrer or argon gas is used for stirring uniformly, a sample is taken, a spectrometer is used for analyzing components, the amount of each alloy is calculated according to the analysis result, aluminum ingot and zinc ingot alloy elements are added at a specified temperature according to the calculation result, the temperature is increased to 730-.

5. The preparation method of the magnesium alloy material for the building templates as claimed in claim 2, wherein in S4, the slag ladle is preheated after the specified refining time is reached, the slag ladle is extended into the bottom of a pan to be fished out to settle impurities and then poured into an iron tank for containing the slag until the liquid in the slag ladle is slightly blackened, the 2# flux is used for surface covering and protecting when combustion and oxidation phenomena are found in the slag ladle, the whole slag ladle process is carried out for 15-20 minutes, refining is carried out again after the slag ladle is finished, the previous refining process is repeated within the specified temperature and time, and the rest of the refining agent is uniformly scattered into magnesium liquid to complete secondary refining.

6. The method for preparing a magnesium alloy material for a building template according to claim 2, wherein in the step S7, homogenization parameters are as follows: 280 ℃ for 1h, 300 ℃ for 3h, 350 ℃ for 1h and 320 ℃ for 1h, air cooling for standby or direct extrusion, and ferrous sulfide protection.

7. The method for preparing a magnesium alloy material for a building template according to claim 2, wherein in S1, a metal mesh is arranged at the bottom of a clean crucible, the magnesium alloy is placed on the metal mesh, after heating is completed, the metal mesh is lifted to separate the metal mesh from the magnesium liquid, weight data of the metal mesh is obtained after 5-10min, and the obtained weight data is compared with initial data of the metal mesh to judge whether the magnesium alloy which is not melted exists on the metal mesh.

8. The method for preparing the magnesium alloy material for the building templates according to claim 7, wherein the metal mesh is hoisted by a hoisting rod, a weight sensor is arranged on the hoisting rod, the weight of the hoisted metal mesh is monitored by the weight sensor, and the monitored data is transmitted back to a control center in a wireless transmission mode.

Technical Field

The invention relates to the technical field of building templates, in particular to a magnesium alloy material for a building template and a preparation method thereof.

Background

The building template is a main tool for concrete structure engineering construction, generally plays a role in supporting and protecting and the like in the pouring process, has huge consumption in the building engineering, and directly influences the quality and the cost of the building engineering by the template technology, so the building template is an important content for promoting the progress of the building technology. In recent years, the real estate industry in China develops fire heat, and building templates are rapidly developed.

At present, the commercial building templates mainly comprise the following materials: the wood template is light in weight and good in universality; but the mechanical property is very limited, the wood formwork is very easy to break in the cement pressure bearing process, the repeated use times are few generally, the great waste is caused, in addition, a large amount of wood is consumed by the wood formwork, and the environment protection is not facilitated. The plastic template is light in weight and relatively low in cost, but the strength and the rigidity of the plastic template are insufficient, and the problem of cold brittleness is also solved. The steel form, although intensity and rigidity are all fine, but weight is overweight, is unfavorable for the construction, and constructor intensity of labour is big, and has the potential safety hazard. The aluminum template has good comprehensive use performance and excellent mechanical property, can be used for multiple times, is heavier under the increasingly improved lightweight requirement of a building structure, needs to be coated on the surface when the commercial aluminum template is used at present so as to avoid the corrosion of the template by cement, needs to be sprayed again after being repeatedly used for 4-5 times, is very inconvenient and increases the cost. The magnesium alloy has low density, the density of pure magnesium is only 2/3 of aluminum, the magnesium alloy has high strength, and has good emission reduction and weight reduction characteristics when being used as a building material, and simultaneously, the magnesium alloy is a green engineering material which is easy to recycle, and is an excellent choice for novel alloy sectional materials for buildings. At present, commercial AZ31 magnesium alloy building templates are popularized and used, however, as the building templates, AZ31 magnesium alloy has very limited mechanical properties (particularly plasticity) and poor anisotropy, which causes the AZ31 magnesium alloy to be very easy to crack when stressed unevenly, and in addition, AZ31 magnesium alloy has poor corrosion resistance, and a protective layer needs to be sprayed on the surface before use, thereby increasing the operation link and increasing the cost.

Disclosure of Invention

The invention aims to solve the defects of unstable mechanical property, low extrusion processing speed and high production cost of a building template in the prior art, and provides a magnesium alloy material for the building template and a preparation method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

the magnesium alloy material for the building template comprises the following raw materials in percentage by mass: 0.25-0.6% of Ca, 0.25-0.5% of Y, 0.35-0.8% of Sn, 0.1-0.5% of Sr and the balance of AZ 41.

The invention also provides a preparation method of the magnesium alloy material for the building template, which comprises the following steps:

s1, melting: heating and melting the magnesium alloy in a clean crucible to prepare magnesium liquid;

s2, alloying: adding aluminum ingot and zinc ingot alloy elements, heating to 730-740 ℃, simultaneously uniformly scattering anhydrous manganese chloride on the liquid surface, and stirring by using a stirrer or argon gas after the anhydrous manganese chloride forms a hard shell to completely melt the anhydrous manganese chloride;

s3, refining: refining for the first time, namely scattering a refining agent by using a stirrer or argon while stirring, wherein the scattering amount of the prepared refining agent is 75 percent;

s4, slag removal and secondary refining: the preheated slag ladle is used for fishing the slag, refining is carried out again after the slag is fished, the previous refining process is repeated, and the residual refining agent is uniformly scattered into the magnesium liquid to complete secondary refining;

s5, after refining, respectively adding magnesium-yttrium master alloy, tin ingot and magnesium-calcium master alloy, carrying out homogenization stirring, then carrying out high-temperature standing at 740-745 ℃ for 45 minutes, then carrying out low-temperature (635-650 ℃) deferrization, and heating to the pouring temperature of 710-720 ℃;

s6, in the casting process, a wire feeder is used for feeding pure metal strontium strips serving as grain refiners into a pipette through a small opening on the pipette, the strontium strips can be fully dissolved into liquid, and the refining effect of the refiners is improved, because the refining effect is gradually weakened along with the prolonging of the casting time if the strontium strips are directly processed into magnesium liquid in a crucible;

and S7, homogenizing the bar after the casting is finished.

Preferably, in S1, 15-20kg of No. 2 flux is uniformly put at the bottom of a clean crucible, and the flux is electrified and heated or air-fed and heated, the temperature of a power distribution cabinet of the furnace is 950 ℃, and the temperature of the molten magnesium is 660-680 ℃.

Preferably, in S2, after the furnace charge is completely melted, a stirrer or argon gas is used to stir uniformly, a sample is taken, a spectrometer is used to analyze the components, the usage amount of each alloy is calculated according to the analysis result, then the alloy elements of the aluminum ingot and the zinc ingot are added at the specified temperature according to the calculation result, the temperature is increased to 730-.

Preferably, in S4, after the specified refining time is reached, the preheated slag ladle is used to start slag salvaging, the slag ladle is extended into the bottom of the pan to be fished out to settle impurities and then poured into an iron tank for containing slag until the liquid in the slag ladle is slightly blackened, when combustion and oxidation phenomena are found in the slag salvaging process, the 2# flux is used for surface covering and protecting, the whole slag salvaging process is carried out for 15-20 minutes, refining is carried out again after slag salvaging is completed, the previous refining process is repeated within the specified temperature and time, and the remaining refining agent is uniformly scattered into the magnesium liquid to complete secondary refining.

Preferably, in S7, the homogenization parameter is: 280 ℃ for 1h, 300 ℃ for 3h, 350 ℃ for 1h and 320 ℃ for 1h, air cooling for standby or direct extrusion, and ferrous sulfide protection.

Preferably, in S1, a metal mesh is disposed at the bottom of the clean crucible, the magnesium alloy is placed on the metal mesh, after heating, the metal mesh is lifted to separate the metal mesh from the magnesium solution, weight data of the metal mesh is acquired after 5-10min, the acquired weight data is compared with initial data of the metal mesh, and whether there is any unmelted magnesium alloy on the metal mesh is determined.

Preferably, the metal net is hoisted through the hoisting rod, the hoisting rod is provided with a weight sensor, the weight of the hoisted metal net is monitored through the weight sensor, and monitored data are transmitted back to the control center in a wireless transmission mode.

Compared with the prior art, the invention has the beneficial effects that:

the slag is fully fished in the two refining processes, the magnesium liquid is cleaner, the flux slag at the crucible bottom is reduced, the poured product is cleaner, the flux slag is not easy to be brought into, and the corrosion resistance of the product is favorably improved.

The pure metal strontium strip serving as the grain refiner is fed into the pipette through a small opening on the pipette by using the wire feeder, the strontium strip can be fully dissolved into the liquid, and the refining effect of the refiner is improved, because the refining effect is gradually weakened along with the prolonging of the pouring time if the strontium strip is directly processed into the magnesium liquid in the crucible.

The magnesium alloy building template is a light-weight specific application in the building industry, reduces the labor intensity of workers, and is a revolutionary improvement on the basis of the existing wrought magnesium alloy material by research, development and popularization of the material, so that the magnesium alloy building template becomes a brand-new magnesium alloy material.

Besides being used for magnesium alloy templates, the magnesium alloy template can also be used for processing and producing other extruded profiles or rolled plates, and has obvious practicability.

The invention improves the condition of adding the refiner in the refining process, improves the effect of refining the refiner, fully drags slag in the two refining processes, makes magnesium liquid cleaner, reduces the flux slag at the bottom of a crucible, makes the poured product cleaner, is not easy to bring flux to clamp slag, is beneficial to improving the corrosion resistance of the product, and has simple, reliable and economic preparation method and process, and easy popularization and application.

Drawings

FIG. 1 is a double-flow casting diagram of a magnesium alloy material for a building template and a preparation method thereof.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example one

Referring to fig. 1, the magnesium alloy material for the building template comprises the following raw materials in percentage by mass: 0.25% of Ca, 0.25% of Y, 0.35% of Sn, 0.1% of Sr and the balance of AZ 41.

The embodiment also provides a preparation method of the magnesium alloy material for the building template, which comprises the following steps:

s1, melting: heating and melting the magnesium alloy in a clean crucible to prepare magnesium liquid;

s2, alloying: adding alloy elements of aluminum ingots and zinc ingots, heating to 730 ℃, simultaneously uniformly spraying anhydrous manganese chloride on the liquid surface, and stirring by using a stirrer or argon gas after the anhydrous manganese chloride forms hard shells to completely melt;

s3, refining: refining for the first time, namely scattering a refining agent by using a stirrer or argon while stirring, wherein the scattering amount of the prepared refining agent is 75 percent;

s4, slag removal and secondary refining: the preheated slag ladle is used for fishing the slag, refining is carried out again after the slag is fished, the previous refining process is repeated, and the residual refining agent is uniformly scattered into the magnesium liquid to complete secondary refining;

s5, after refining, respectively adding magnesium-yttrium intermediate alloy, tin ingot and magnesium-calcium intermediate alloy, carrying out homogenization stirring, then carrying out high-temperature standing for 45 minutes at 740-745 ℃, then carrying out low-temperature iron removal at 635 ℃, and heating to the pouring temperature of 710 ℃;

s6, in the casting process, a wire feeder is used for feeding pure metal strontium strips serving as grain refiners into a pipette through a small opening on the pipette, the strontium strips can be fully dissolved into liquid, and the refining effect of the refiners is improved, because the refining effect is gradually weakened along with the prolonging of the casting time if the strontium strips are directly processed into magnesium liquid in a crucible;

and S7, homogenizing the bar after the casting is finished.

In this example, in S1, 15kg of # 2 flux was uniformly placed at the bottom of a clean crucible, and the crucible was electrically or pneumatically heated, with the furnace switch board set at 950 ℃ and the molten magnesium bath at 660 ℃.

In this embodiment, in S2, after the furnace charge is completely melted, a stirrer or argon gas is used to stir the charge uniformly, a sample is taken and analyzed by a spectrometer for components, the amount of each alloy is calculated according to the analysis result, then the alloy elements of the aluminum ingot and the zinc ingot are added at a predetermined temperature according to the calculation result, the temperature is raised to 730 ℃, meanwhile, anhydrous manganese chloride is uniformly sprinkled on the liquid surface, and after the anhydrous manganese chloride forms a hard shell, the mixture is stirred by the stirrer or argon gas to be completely melted.

In the embodiment, in S4, the preheated slag ladle is used for dragging slag after the specified refining time is reached, the slag ladle is stretched into the bottom of a pot, the slag ladle is fished out to settle impurities and then poured into an iron tank for containing slag until liquid in the slag ladle is slightly blackened, when combustion and oxidation phenomena are found in the slag dragging process, 2# flux is used for surface covering and protecting, the whole slag dragging process is carried out for 15 minutes, refining is carried out again after the slag dragging is finished, the previous refining process is repeated within the specified temperature and time, and the residual refining agent is uniformly scattered into magnesium liquid to finish secondary refining.

In this example, in S7, the homogenization parameters: 280 ℃ for 1h, 300 ℃ for 3h, 350 ℃ for 1h and 320 ℃ for 1h, air cooling for standby or direct extrusion, and ferrous sulfide protection.

In this embodiment, in S1, a metal mesh is disposed at the bottom of the clean crucible, the magnesium alloy is placed on the metal mesh, after heating, the metal mesh is lifted to separate the metal mesh from the magnesium solution, after 5min, the weight data of the metal mesh is obtained, the obtained weight data is compared with the initial data of the metal mesh, and it is determined whether there is any magnesium alloy on the metal mesh that has not been melted.

In this embodiment, the metal mesh is hoisted through the jib, is equipped with weighing transducer on the jib, monitors the weight of the metal mesh of hoisting through weighing transducer, passes the data of monitoring back control center through wireless transmission's mode.

Example two

Referring to fig. 1, the magnesium alloy material for the building template comprises the following raw materials in percentage by mass: 0.5% of Ca, 0.4% of Y, 0.6% of Sn, 0.3% of Sr and the balance of AZ 41.

The embodiment also provides a preparation method of the magnesium alloy material for the building template, which comprises the following steps:

s1, melting: heating and melting the magnesium alloy in a clean crucible to prepare magnesium liquid;

s2, alloying: adding aluminum ingot and zinc ingot alloy elements, heating to 735 ℃, simultaneously uniformly spraying anhydrous manganese chloride on the liquid surface, and stirring by using a stirrer or argon gas after the anhydrous manganese chloride forms hard shells to completely melt the anhydrous manganese chloride;

s3, refining: refining for the first time, namely scattering a refining agent by using a stirrer or argon while stirring, wherein the scattering amount of the prepared refining agent is 75 percent;

s4, slag removal and secondary refining: the preheated slag ladle is used for fishing the slag, refining is carried out again after the slag is fished, the previous refining process is repeated, and the residual refining agent is uniformly scattered into the magnesium liquid to complete secondary refining;

s5, after refining, respectively adding magnesium-yttrium intermediate alloy, tin ingot and magnesium-calcium intermediate alloy, carrying out homogenization stirring, then carrying out high-temperature standing at 742 ℃ for 45 minutes, then carrying out low-temperature iron removal at 640 ℃, and heating to pouring temperature of 715 ℃;

s6, in the casting process, a wire feeder is used for feeding pure metal strontium strips serving as grain refiners into a pipette through a small opening on the pipette, the strontium strips can be fully dissolved into liquid, and the refining effect of the refiners is improved, because the refining effect is gradually weakened along with the prolonging of the casting time if the strontium strips are directly processed into magnesium liquid in a crucible;

and S7, homogenizing the bar after the casting is finished.

In this example, in S1, 17kg of # 2 flux was uniformly placed at the bottom of a clean crucible, and the crucible was electrically or pneumatically heated, with the furnace switch board set at 950 ℃ and the molten magnesium bath at 670 ℃.

In this embodiment, in S2, after the furnace charge is completely melted, a stirrer or argon gas is used to stir the charge uniformly, a sample is taken and analyzed by a spectrometer for components, the amount of each alloy is calculated according to the analysis result, then the alloy elements of aluminum ingot and zinc ingot are added at a predetermined temperature according to the calculation result, the temperature is raised to 735 ℃, meanwhile, anhydrous manganese chloride is uniformly sprinkled on the liquid surface, and after the anhydrous manganese chloride forms a hard shell, the mixture is stirred by a stirrer or argon gas to be completely melted.

In the embodiment, in S4, the preheated slag ladle is used for dragging slag after the specified refining time is reached, the slag ladle is stretched into the bottom of a pot, the slag ladle is fished out to settle impurities and then poured into an iron tank for containing slag until liquid in the slag ladle is slightly blackened, when combustion and oxidation phenomena are found in the slag dragging process, 2# flux is used for surface covering and protection, the whole slag dragging process is carried out for 17 minutes, refining is carried out again after the slag dragging is completed, the previous refining process is repeated within the specified temperature and time, and the residual refining agent is uniformly scattered into magnesium liquid to complete secondary refining.

In this example, in S7, the homogenization parameters: 280 ℃ for 1h, 300 ℃ for 3h, 350 ℃ for 1h and 320 ℃ for 1h, air cooling for standby or direct extrusion, and ferrous sulfide protection.

In this embodiment, in S1, a metal mesh is disposed at the bottom of the clean crucible, the magnesium alloy is placed on the metal mesh, after heating, the metal mesh is lifted to separate the metal mesh from the magnesium solution, weight data of the metal mesh is obtained after 7min, the obtained weight data is compared with initial data of the metal mesh, and whether there is any unmelted magnesium alloy on the metal mesh is determined.

In this embodiment, the metal mesh is hoisted through the jib, is equipped with weighing transducer on the jib, monitors the weight of the metal mesh of hoisting through weighing transducer, passes the data of monitoring back control center through wireless transmission's mode.

EXAMPLE III

Referring to fig. 1, the magnesium alloy material for the building template comprises the following raw materials in percentage by mass: 0.6% of Ca, 0.5% of Y, 0.8% of Sn, 0.5% of Sr and the balance of AZ 41.

The embodiment also provides a preparation method of the magnesium alloy material for the building template, which comprises the following steps:

s1, melting: heating and melting the magnesium alloy in a clean crucible to prepare magnesium liquid;

s2, alloying: adding alloy elements of aluminum ingots and zinc ingots, heating to 740 ℃, simultaneously uniformly scattering anhydrous manganese chloride on the liquid surface, and stirring by using a stirrer or argon gas after the anhydrous manganese chloride forms hard shells to completely melt;

s3, refining: refining for the first time, namely scattering a refining agent by using a stirrer or argon while stirring, wherein the scattering amount of the prepared refining agent is 75 percent;

s4, slag removal and secondary refining: the preheated slag ladle is used for fishing the slag, refining is carried out again after the slag is fished, the previous refining process is repeated, and the residual refining agent is uniformly scattered into the magnesium liquid to complete secondary refining;

s5, after refining, respectively adding magnesium-yttrium intermediate alloy, tin ingot and magnesium-calcium intermediate alloy, carrying out homogenization stirring, then carrying out high-temperature standing for 45 minutes at 745 ℃, then carrying out low-temperature iron removal at 650 ℃, and heating to the casting temperature of 720 ℃;

s6, in the casting process, a wire feeder is used for feeding pure metal strontium strips serving as grain refiners into a pipette through a small opening on the pipette, the strontium strips can be fully dissolved into liquid, and the refining effect of the refiners is improved, because the refining effect is gradually weakened along with the prolonging of the casting time if the strontium strips are directly processed into magnesium liquid in a crucible;

and S7, homogenizing the bar after the casting is finished.

In this example, in S1, 20kg of # 2 flux was uniformly placed at the bottom of a clean crucible, and the crucible was electrically or pneumatically heated, the furnace switch board was set at 950 ℃, and the molten magnesium was heated to 680 ℃.

In this embodiment, in S2, after the furnace charge is completely melted, a stirrer or argon gas is used to stir uniformly, a sample is taken, and a spectrometer is used to analyze the components, the amount of each alloy is calculated according to the analysis result, then the alloy elements of the aluminum ingot and the zinc ingot are added at a predetermined temperature according to the calculation result, the temperature is raised to 740 ℃, meanwhile, anhydrous manganese chloride is uniformly sprinkled on the liquid surface, and after the anhydrous manganese chloride forms a hard shell, the mixture is stirred by the stirrer or argon gas to be completely melted.

In the embodiment, in S4, the preheated slag ladle is used for dragging slag after the specified refining time is reached, the slag ladle is stretched into the bottom of a pot, the slag ladle is fished out to settle impurities and then poured into an iron tank for containing slag until liquid in the slag ladle is slightly blackened, when combustion and oxidation phenomena are found in the slag dragging process, 2# flux is used for surface covering and protecting, the whole slag dragging process is carried out for 20 minutes, refining is carried out again after the slag dragging is completed, the previous refining process is repeated within the specified temperature and time, and the residual refining agent is uniformly scattered into magnesium liquid to complete secondary refining.

In this example, in S7, the homogenization parameters: 280 ℃ for 1h, 300 ℃ for 3h, 350 ℃ for 1h and 320 ℃ for 1h, air cooling for standby or direct extrusion, and ferrous sulfide protection.

In this embodiment, in S1, a metal mesh is disposed at the bottom of the clean crucible, the magnesium alloy is placed on the metal mesh, after heating, the metal mesh is lifted to separate the metal mesh from the magnesium solution, weight data of the metal mesh is obtained after 10min, the obtained weight data is compared with initial data of the metal mesh, and whether there is any unmelted magnesium alloy on the metal mesh is determined.

In this embodiment, the metal mesh is hoisted through the jib, is equipped with weighing transducer on the jib, monitors the weight of the metal mesh of hoisting through weighing transducer, passes the data of monitoring back control center through wireless transmission's mode.

Compared with the traditional template process, the magnesium template system has at least the following advantages:

1. the construction period is short: the magnesium template system is a quick-release template system, one set of templates can reach one layer in four days in normal construction, the assembly line construction can be well expanded, the construction progress is greatly improved, and the management cost is saved.

2. The repeated use times are many, the average use cost is low: the magnesium template system adopts a magnesium alloy section bar formed by integral extrusion as a raw material, and a set of templates can be used for more than 300 times in a standard construction and turnover way. The purchase price of one set of template is shared to save a great deal of cost compared with the traditional template.

3. Construction convenience, efficient: the magnesium template system is simple and convenient to assemble, the average weight is about 16kg, the magnesium template system is completely carried and assembled by manpower without the assistance of any mechanical equipment, the system design is simple, and the hand-in speed of workers and the template overturning speed are high. Skilled installation workers can install the water in the water tank by 20-30 square meters each day, and labor cost is greatly saved.

4. Good stability and high bearing capacity: the bearing capacity of most magnesium template systems can reach 60KN per square meter, and the requirement of the bearing capacity of the formwork of most residential buildings is met.

5. The application range is wide: the magnesium template is suitable for the use of wall bodies, horizontal floor slabs, pillars, beams, stairs, windowsills, floating plates and other positions, and is useful for secondary structure formwork support such as ring beams, constructional columns, reverse ridges and the like.

6. The abutted seam is few, the precision is high, and the concrete surface effect after the form removal is good: after the magnesium building template is demolded, the surface quality of the concrete is smooth and clean, the requirements of a veneer and fair-faced concrete can be basically met, the plastering is not needed, and the plastering cost can be saved.

7. The site operation rubbish is few, and the support system is succinct: all accessories of the magnesium template system can be reused, after the template is disassembled during construction, no garbage is left on site, the structure of the supporting system is simple, and the dismounting is convenient, so that the whole construction environment is safe, clean and tidy.

8. The standard and the universality are strong: the magnesium template has multiple specifications and can be assembled by adopting plates with different specifications according to projects; when the used template is used to reconstruct a new building, only about 20 non-standard templates need to be replaced, so that the cost can be reduced.

9. The recovery value is high: after the magnesium template is scrapped, when the waste treatment residual value is high, the equal share cost advantage is obvious.

10. Low carbon emission reduction: all materials of the magnesium template system are renewable materials, and meet the national regulations on energy conservation, environmental protection, low carbon and emission reduction of building projects.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.