A mechanized device for smelting magnesium and calcium and a method of using the same

Abstract

The present invention discloses a mechanized device for smelting magnesium and calcium and a method for using the same, and belongs to the technical field of non-ferrous metal smelting. The mechanized device for smelting magnesium and calcium includes a reduction tank, a pre-calcining barrel and an inner sleeve. A longitudinal reinforcing plate is arranged inside the inner sleeve, an opening is provided at the top of the inner sleeve, a plurality of partitions are arranged at both ends and in the middle of the inner sleeve, a plurality of through holes are provided on each partition, and a hook is provided at the end of the inner sleeve. The method of use is to transfer the pressed pellet material into the inner sleeve, and the inner sleeve is quickly loaded into the reduction tank through a mechanical device; vacuuming and heating reduction; after the reaction is sufficient, the vacuum of the reduction tank is destroyed, and the reduced magnesium and calcium are pulled out, and the inner sleeve and the reduced slag are pulled out together through the hook and transferred into the pre-calcining barrel, and the dolomite and limestone in the pre-calcining barrel are pre-calcined by using the sensible heat of the reduced slag. The device structure and the method of use of the present invention can realize rapid and convenient slagging, high magnesium and calcium reduction rate, low heat energy loss of the reduced slag, simple operation and high utilization rate.

Description

Technical Field

[0001] The invention belongs to the technical field of nonferrous metal smelting, and relates to a mechanized device for smelting magnesium-calcium and a method for using the device. Background Art

[0002] The production process of magnesium and calcium is similar, with two production processes: molten salt electrolysis and metal thermal reduction. The metal thermal reduction method has the highest market share. However, the process of producing magnesium and calcium by metal thermal reduction has technical problems such as low automation and high energy consumption.

[0003] The process of producing magnesium metal by metal thermal reduction is usually called the Pidgeon process, which was successfully industrialized by Canadian Professor L.M. Pidgeon at the Haley magnesium plant of Timminco in 1941. The basic process is to calcine dolomite to generate MgO·CaO (commonly known as calcined white), then grind and press it into balls together with ferrosilicon and a small amount of additives (fluorite), and put it into a heat-resistant steel reduction tank for smelting at 1200-1250℃ and 13.3-133Pa vacuum. Magnesium oxide reacts with silicon in the reducing agent ferrosilicon to generate gaseous magnesium metal, which enters the crystallizer located in the low-temperature zone at the end of the reduction tank and is cooled by water, where it condenses and crystallizes to obtain magnesium metal. CaO in calcined white reacts with silicon dioxide generated by oxidation in the reducing agent ferrosilicon to generate calcium silicate, which becomes the main component of the reduction slag.

[0004] The thermal reduction process of calcium metal is similar to the Pijiang process of magnesium refining, except that the reducing agent used is aluminum metal particles, the reduction temperature is slightly higher than the reduction temperature of magnesium metal by about 50°C, the resulting reduction slag is a mixture of various calcium aluminates, and the calcium metal is also in a gaseous state and condenses and crystallizes in the crystallizer to form solid calcium metal. The other parts of the calcium metal production are the same as the magnesium metal reduction process. In addition, the production process of strontium metal, barium metal, etc. is also similar in process and equipment.

[0005] Therefore, the reduction tank of the Pijiang process for magnesium smelting is always placed in a heated high-temperature furnace. After one reduction is completed, the vacuum of the reduction tank is destroyed, and the metal magnesium and metal calcium in the crystallizer are first taken out, and then the reduction slag is scraped out. Then new pellets are added and vacuum is drawn for the next reduction process. The reduction cycle of metal magnesium is generally 12 hours, and the reduction cycle of metal calcium is generally 12-18 hours. Obviously, the reduction cycle is long, the cost of adding and removing raw materials and removing the reduction slag is high, the sensible heat of the reduction slag is not effectively utilized, and the resource utilization is low.

[0006] At present, the temperature of magnesium and calcium reduction slag is 1200-1250℃. There are two ways to place the reduction pot in the heating furnace: horizontal and vertical, which are usually called horizontal pot magnesium (calcium) smelting and vertical pot magnesium (calcium) smelting.

[0007] Chinese patent CN206447926U discloses a horizontal magnesium reduction slag slag removal device, in which the reversible slag removal device provided can solve most of the reduction slag mechanical slag removal problems, but it cannot remove the reduction slag cleanly, and it needs to be manually replenished and cleaned afterwards. The problems caused by this are, on the one hand, the poor operating environment in front of the furnace, high labor intensity, and the inability to achieve automated production, and on the other hand, the slow speed of mechanical slag removal. After the reduction slag is removed, the temperature drops significantly, and a large amount of heat energy radiates into the surrounding environment, which brings inconvenience to on-site operations and is not conducive to energy saving and consumption reduction. Chinese patent CN105543505A discloses a slag removal machine for a reduction tank with hydraulic and walking devices, and the device structure also has similar problems.

[0008] The rapid removal of reduced slag and the effective utilization of high-temperature waste heat are difficult to achieve in the intermittent production process of magnesium-calcium smelting.

[0009] For example: Chinese patent CN105716437A discloses a method for generating hot air by utilizing the sensible heat of reducing slag; Chinese patent CN206918977U discloses a method for generating steam by utilizing the sensible heat of reducing slag through a tube-in-tube heat exchanger; Chinese patent CN104457287A discloses a method for recovering the waste heat of reducing slag to generate hot air and hot water by using a dual cooling method of air cooling and water cooling. These methods do not consider the rapid removal of reducing slag, but only consider the utilization of the waste heat of reducing slag through heat exchange. Obviously, the utilization method is rough, the utilization rate of steam, hot air and hot water is low, and the influence of dolomite and limestone on waste heat utilization is not considered, nor the influence of this utilization method on magnesium-calcium smelting.

[0010] In particular, the existing magnesium-calcium smelting device structure only considers how to improve the magnesium-calcium reduction rate, and the device structure setting is concentrated on the heat exchange and cooling components in the reduction device.

[0011] For example: Chinese patent CN109609787A discloses a device for smelting magnesium, calcium, strontium and barium, wherein the inner tank plays the role of heat transfer, and the enhanced heat exchange device is a central dividing plate of 1 / 2 to 8 / 9 of the length of the inner tank. The place with the lowest temperature in the reduction process has been transferred from the central tube attachment position of the traditional structure to the position between the inner tank and the outer tank. Therefore, under the condition of the same heating time, the device described in the present invention can reduce the reduction cycle, and under the premise of the same reduction degree, it can increase the reduction rate.

[0012] Chinese patent CN109536709A discloses an improved cooling section of a reduction tank for smelting magnesium and calcium metals. The design of the cooling section is conducive to the sedimentation of dust and reduces the inclusion of solid particles in the metal; the crystallization state of the metal product is improved, and in particular, the temperature of the metal vapor-crystallization surface can be adjusted by adjusting the cooling medium in the conditional crystallizer, thereby adjusting the supersaturation of the gas phase, obtaining the desired appearance of the metal product, and improving the purity of the metal.

[0013] In summary, the structure of the magnesium-calcium smelting device in the prior art not only does not completely remove the slag, but also has poor utilization of the thermal energy of the reduced slag. Some of them are only limited to the utilization of thermal energy in the smelting process and improving the magnesium-calcium reduction rate, and do not consider the slag removal of the reduced slag and the coordinated and efficient utilization of thermal energy. Summary of the invention

[0014] The technical problem to be solved by the present invention is how to overcome the technical defect that the device structure in the existing technology of magnesium-calcium smelting cannot coordinate and efficiently utilize the reducing slag, which involves technical problems such as incomplete mechanical slag removal, low efficiency of manual slag removal, and heat energy utilization being limited to the reduction process. Therefore, the technical solution that needs to be provided not only needs to be able to achieve rapid and convenient slag removal and high magnesium-calcium reduction rate, but also low heat energy loss in the heat energy utilization process of the reducing slag, simple operation, and high utilization rate.

[0015] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0016] A mechanized device for smelting magnesium-calcium comprises a reduction tank, a pre-calcining barrel and an inner sleeve, wherein a longitudinal reinforcing plate is arranged inside the inner sleeve, an opening is provided at the top of the inner sleeve, a plurality of partitions are arranged at both ends and the middle of the inner sleeve, a plurality of through holes are provided on each partition, and a hook is provided at the end of the inner sleeve.

[0017] Preferably, the longitudinal reinforcing plate is made of heat-resistant steel, which may be 310, 310S or other heat-resistant steel, or may be the same material as the reduction tank.

[0018] Preferably, the outer diameter of the inner sleeve is 2-10 mm smaller than the inner diameter of the reduction tank.

[0019] Preferably, the length of the longitudinal reinforcing plate is the same as the length of the heating section of the reduction tank.

[0020] Preferably, the height of the longitudinal reinforcing plate is 3-5 cm smaller than the inner diameter of the reduction tank, so as to prevent the reduction tank from being deformed and stuck and unable to be removed.

[0021] Preferably, the bottom of the longitudinal reinforcing plate is connected to the inner sleeve by welding, which can improve the overall strength of the inner sleeve.

[0022] Preferably, the plurality of partitions are 4-5 partitions with a thickness of 3-5 mm.

[0023] Preferably, the plurality of through holes are at least 10 small holes with a diameter of 10-30 mm, the small holes are arranged randomly, and the distance between the small holes is 30-50 mm; the arrangement of the small holes can facilitate the discharge of magnesium and calcium vapor.

[0024] Preferably, the opening is a fan-shaped opening with an opening angle of 10-30° arranged at the top of the inner sleeve; the opening can be used to load pellets and unload reduced slag.

[0025] Preferably, the pre-calcination barrel is a hollow barrel, and the inner diameter of the barrel is 3-5 mm larger than the outer diameter of the inner sleeve.

[0026] Preferably, the inner sleeve is concentrically arranged in the reduction tank and the pre-calcination barrel, the pellets in the reduction tank are arranged in the inner sleeve, and the dolomite and limestone in the pre-calcination barrel are arranged between the inner wall and the outer wall of the pre-calcination barrel.

[0027] The method for using the magnesium-calcium smelting mechanized device, the steps of the method for using are as follows:

[0028] S1. Transfer the pressed pellets into the inner sleeve through the top opening of the inner sleeve;

[0029] S2, quickly loading the inner sleeve in step S1 into the reduction tank through a mechanical device;

[0030] S3, evacuating the reduction tank in step S2, and then heating to reduce magnesium and calcium;

[0031] S4, after the heating reduction in step S3 is fully completed, the vacuum of the reduction tank is destroyed, the reduced magnesium and calcium are pulled out, and then the inner sleeve and the reduced slag inside are pulled out together through a hook through a mechanical device;

[0032] S5, pulling out the inner sleeve through the hook in step S4 and transferring it into a pre-calcining barrel, and pre-calcining the dolomite and limestone in the pre-calcining barrel by using the sensible heat of the reducing slag inside the inner sleeve;

[0033] S6. When the temperature of the inner sleeve in step S5 is consistent with the temperature of dolomite and limestone, the pre-calcination process stops. At this time, the temperature of the reduced slag inside the inner sleeve is 600-700°C, and the remaining sensible heat of the reduced slag is used for waste heat boiler or the reduced slag directly enters the slag yard for air cooling.

[0034] Preferably, in steps S4 and S5, the calcining barrel can be placed at a suitable position of the reduction tank first, so that the pre-calcining barrel and the inner sleeve are in a concentric position, and then the inner sleeve and the reduced slag therein are pulled into the pre-calcining barrel together with a hook.

[0035] Preferably, dolomite and limestone directly enter the crushing system or the dolomite calcining rotary kiln according to the calcination weight loss rate.

[0036] Preferably, the degree of pre-calcination depends on the size of the outer diameter. If the outer diameter is 1.5-2.0 times the inner diameter, the pre-calcined material can be directly turned into calcined white. If the outer diameter exceeds 3 times the inner diameter, the pre-calcined material must enter the rotary kiln for further calcination to remove carbon dioxide. However, regardless of the size of the inner diameter and the outer diameter, the sensible heat of the reduced slag can be effectively utilized through the pre-calcination barrel, reducing the energy consumption of the calcination process, which is the second energy-consuming process in the production process of metal magnesium and calcium.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] In the above scheme, the present invention uses the matching structure of the inner sleeve, the pre-calcining barrel and the reduction tank in the structure of the magnesium-calcium smelting mechanized device, and utilizes the structure of the top opening of the inner sleeve, the longitudinal reinforcing plate and the perforated partition plate to facilitate the reduction process, and the reduction slag is completely removed and transferred to the pre-calcining barrel to efficiently utilize the waste heat of the reduction slag.

[0039] The positional relationship and connection relationship of the inner sleeve structure and its internal components in the device structure of the present invention can improve the reduction efficiency of magnesium and calcium and the metal purity. In particular, the hook setting of the inner sleeve makes the reduction slag removal efficient and does not require manual slag cleaning later.

[0040] The hook arrangement of the inner sleeve and the position arrangement of the pre-calcining barrel of the present invention enable the reducing slag to quickly and completely come out of the reducing tank and enter the pre-calcining barrel to pre-calcine dolomite and limestone, thereby minimizing the loss of heat radiation, achieving high heat energy utilization efficiency and reducing the cost of magnesium-calcium smelting.

[0041] The present invention, through the above-mentioned device structure setting and matching use method, can not only realize rapid loading and rapid removal of reduced slag, but also use sensible heat for pre-calcination of dolomite and limestone to effectively reduce the energy consumption of the calcination process; and the sensible heat utilization process of the reduced slag can be highly synchronized with the metal magnesium and calcium smelting process, which is beneficial to large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1This is a front view of an inner sleeve in a mechanized device for magnesia-calcium smelting according to the present invention, wherein: mark 1 is the outer shell of the inner sleeve, mark 2 is the longitudinal reinforcing plate, and mark 3 is the opening angle;

[0044] Figure 2 It is a side view of an inner sleeve in a mechanized device for smelting magnesium and calcium according to the present invention, wherein: 4 is a partition with holes, and 5 is a hook;

[0045] Figure 3 This is a pre-calcining barrel in a magnesium-calcium smelting mechanized device of the present invention, wherein: mark 6 is an inner sleeve with a reinforcing plate, mark 7 is dolomite and limestone, mark 8 is the outer shell of the pre-calcining barrel; mark Φ1 is the inner diameter of the pre-calcining barrel, and mark Φ2 is the outer diameter of the pre-calcining barrel. DETAILED DESCRIPTION

[0046] The following will describe the technical solutions and technical problems solved in the embodiments of the present invention in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0047] A mechanized device for smelting magnesium and calcium, such as Figure 1 and 2 As shown, the magnesium-calcium smelting mechanized device includes a reduction tank, a pre-calcining barrel and an inner sleeve, an inner sleeve outer shell 1 is arranged outside the inner sleeve, a longitudinal reinforcing plate 2 is arranged inside the inner sleeve, an opening with an opening angle 3 of θ is opened on the top of the inner sleeve, a plurality of partitions 4 with holes are arranged at both ends and the middle of the inner sleeve, and a hook 5 is arranged at the end of the inner sleeve.

[0048] like Figure 3 As shown, the structure of the pre-calcining barrel is a hollow barrel, the hollow structure of the hollow barrel is a cylindrical space, a pre-calcining space is arranged between the outer shell 8 and the inner wall of the pre-calcining barrel, and the pre-calcining space is filled with dolomite and limestone 7; during use, the hollow structure of the pre-calcining barrel is occupied by the inner sleeve 6 with a reinforcement plate transferred in by a mechanical device, and the inner sleeve 6 with a reinforcement plate and the pre-calcining barrel are arranged concentrically.

[0049] During the use of the pre-calcined barrel, the degree of pre-calcination depends on the size of the outer diameter. Figure 3 As shown, if the outer diameter Φ2 of the precalcining barrel is 1.5-2.0 times the inner diameter Φ1 of the precalcining barrel, the precalcined material can be directly turned into calcined white. If the outer diameter Φ2 of the precalcining barrel exceeds 3 times the inner diameter Φ1 of the precalcining barrel, the precalcined material must enter the rotary kiln for further calcination to remove carbon dioxide. However, regardless of the size of the inner diameter and outer diameter, the sensible heat of the reduction slag can be effectively utilized through the precalcining barrel, reducing the energy consumption of the calcining process, the second energy-consuming process in the production process of metal magnesium and calcium.

[0050] Example 1

[0051] A mechanized device for smelting magnesium and calcium, wherein the mechanized device for smelting magnesium and calcium is made of 310 stainless steel coil with a thickness of 3mm and an inner sleeve with an outer diameter of 375mm, the top opening angle θ=20°, and the inner sleeve length is 3.1m; the longitudinal reinforcing plate is 5mm thick and made of 310 stainless steel, and two partitions are provided, and 20 holes with a diameter of 15mm are opened on the partitions and end plates, and the material of the partitions is 310 stainless steel. 190 kg of reducing balls are set in the inner sleeve. A hook is welded at the end of the inner sleeve, and the hook is still made of 310 stainless steel. The inner diameter of the pre-calcined barrel is 390mm, the outer diameter is 550mm, and the length is 3.5m. The inner barrel of the pre-calcined barrel is made of 310 stainless steel, and the outer barrel is made of 45# steel coil into a barrel shape and welded.

[0052] The method for using the magnesium-calcium smelting mechanized device, the steps of the method for using are as follows:

[0053] S1. Transfer the pressed pellets into the inner sleeve through the top opening of the inner sleeve;

[0054] S2, quickly loading the inner sleeve in step S1 into the reduction tank through a mechanical device;

[0055] S3, evacuating the reduction tank in step S2, and then heating to reduce magnesium and calcium;

[0056] S4, after the heating reduction in step S3 is fully completed, the vacuum of the reduction tank is destroyed, the pre-calcination barrel is placed in a good position, and then the inner sleeve is pulled out from the inside of the pre-calcination barrel through a hook and enters the pre-calcination barrel, and then both ends of the pre-calcination barrel are covered with insulation materials, and the dolomite and limestone in the pre-calcination barrel are pre-calcined by using the sensible heat of the reduction slag inside the inner sleeve;

[0057] S5. When the temperature of the inner sleeve in step S4 is consistent with the temperature of dolomite and limestone, the pre-calcination process stops. At this time, the temperature of the reduced slag inside the inner sleeve is 650° C. (please give a specific value). The remaining sensible heat of the reduced slag is used for waste heat boiler or the reduced slag is directly sent to the slag yard for air cooling.

[0058] S6, weighing the dolomite and limestone pre-calcined products in the pre-calcined barrel in step S5, and calculating the weight loss rate. If the weight loss rate is qualified, the products are sent to the crushing and grinding process. If the weight loss rate is not enough, the products are sent to the rotary kiln for further calcination while hot.

[0059] Example 2

[0060] A mechanized device for smelting magnesium and calcium, wherein the mechanized device for smelting magnesium and calcium is made of a heat-resistant steel material with a thickness of 4 mm, and the outer diameter of the inner sleeve is 5 less than the inner diameter of the reduction tank, the top opening angle θ=18°, and the length of the inner sleeve is the same as the reduction tank; the thickness of the longitudinal reinforcing plate is 10 mm, and the material is 310 heat-resistant steel, and 4 partitions are provided, and 15 holes with a diameter of 30 mm are opened on the partitions, and the material of the partitions is 310 heat-resistant steel. The inner sleeve is equipped with 150 kg of reduction balls. A hook is welded at the end of the inner sleeve, and the hook is made of 310 heat-resistant steel. The inner diameter of the pre-calcined barrel is 340 mm, the outer diameter is 500 mm, and the length is the same as the reduction tank. The inner barrel material and the outer barrel material of the pre-calcined barrel are both ordinary steel, such as 45# steel coiled into a barrel shape and welded.

[0061] The method for using the magnesium-calcium smelting mechanized device, the steps of the method for using are as follows:

[0062] S1. Transfer the pressed pellets into the inner sleeve through the top opening of the inner sleeve;

[0063] S2, quickly loading the inner sleeve in step S1 into the reduction tank through a mechanical device;

[0064] S3, evacuating the reduction tank in step S2, and then heating to reduce magnesium and calcium;

[0065] S4, after the heating reduction in step S3 is fully completed, the vacuum of the reduction tank is destroyed, the pre-calcination barrel is placed in a good position, and then the inner sleeve is pulled out from the inside of the pre-calcination barrel through a hook and enters the pre-calcination barrel, and then both ends of the pre-calcination barrel are covered with insulation materials, and the dolomite and limestone in the pre-calcination barrel are pre-calcined by using the sensible heat of the reduction slag inside the inner sleeve;

[0066] S5. When the temperature of the inner sleeve in step S4 is consistent with the temperature of dolomite and limestone, the pre-calcination process stops. At this time, the temperature of the reduced slag inside the inner sleeve is 680°C (please give a specific value). The remaining sensible heat of the reduced slag is used for the waste heat boiler or the reduced slag is directly sent to the slag yard for air cooling;

[0067] S6, weighing the dolomite and limestone pre-calcined products in the pre-calcined barrel in step S5, and calculating the weight loss rate. If the weight loss rate is qualified, the products are sent to the crushing and grinding process. If the weight loss rate is not enough, the products are sent to the rotary kiln for further calcination while hot.

[0068] Example 3

[0069] A mechanized device for smelting magnesium and calcium, wherein the mechanized device for smelting magnesium and calcium is made of a heat-resistant steel material with a thickness of 5 mm, and the outer diameter of the inner sleeve is 5 mm smaller than the inner diameter of the reduction tank, the top opening angle θ=25°, and the length of the inner sleeve is the same as the length of the heating section of the reduction tank; the thickness of the longitudinal reinforcing plate is 15 mm, and the material is 310S stainless steel, and two partitions are provided, and 15 holes with a diameter of 30 mm are opened on the partition and the end plate, and the material of the partition is 310S heat-resistant steel. The inner sleeve is equipped with 160 kg of reduction balls. A hook is welded at the end of the inner sleeve, and the hook is made of 310S heat-resistant steel. The inner diameter of the pre-calcined barrel is 5 mm larger than the outer diameter of the inner sleeve, the outer diameter is 600 mm, and the length is the same as the inner sleeve. The inner barrel of the pre-calcined barrel is made of 304 stainless steel, and the outer barrel is made of 304 stainless steel coiled into a barrel shape and welded.

[0070] The method for using the magnesium-calcium smelting mechanized device, the steps of the method for using are as follows:

[0071] S1. Transfer the pressed pellets into the inner sleeve through the top opening of the inner sleeve;

[0072] S2, quickly loading the inner sleeve in step S1 into the reduction tank through a mechanical device;

[0073] S3, evacuating the reduction tank in step S2, and then heating to reduce magnesium and calcium;

[0074] S4, after the heating reduction in step S3 is fully completed, the vacuum of the reduction tank is destroyed, the pre-calcination barrel is placed in a good position, and then the inner sleeve is pulled out from the inside of the pre-calcination barrel through a hook and enters the pre-calcination barrel, and then both ends of the pre-calcination barrel are covered with insulation materials, and the dolomite and limestone in the pre-calcination barrel are pre-calcined by using the sensible heat of the reduction slag inside the inner sleeve;

[0075] S5, when the temperature of the inner sleeve in step S4 is consistent with the temperature of dolomite and limestone, the pre-calcination process stops, at which time the temperature of the reduced slag inside the inner sleeve is 620°C, and the remaining sensible heat of the reduced slag is used for waste heat boiler or the reduced slag directly enters the slag yard for air cooling;

[0076] S6, weighing the dolomite and limestone pre-calcined products in the pre-calcined barrel in step S5, and calculating the weight loss rate. If the weight loss rate is qualified, the products are sent to the crushing and grinding process. If the weight loss rate is not enough, the products are sent to the rotary kiln for further calcination while hot.

[0077] Example 4

[0078] A mechanized device for smelting magnesium and calcium, wherein the mechanized device for smelting magnesium and calcium is made of heat-resistant steel with a thickness of 8 mm, and the outer diameter of the inner sleeve is 5 mm smaller than the inner diameter of the reduction tank, the top opening angle θ=18°, and the length of the inner sleeve is the same as the reduction tank; the thickness of the longitudinal reinforcing plate is 20 mm, and the material is 310S heat-resistant steel, and two partitions are provided, and 10 holes with a diameter of 40 mm are opened on the partition and the end plate, and the material of the partition is 310S heat-resistant steel. The inner sleeve contains 140 kg of reduction balls. A hook is welded at the end of the inner sleeve, and the hook is made of 310S heat-resistant steel. The inner diameter of the pre-calcined barrel is 5 mm larger than the inner sleeve diameter, the outer diameter is 450 mm, and the length is the same as the reduction tank. The inner barrel of the pre-calcined barrel is made of ordinary steel, such as No. 45 steel, and the outer barrel is ordinary steel rolled into a barrel shape and welded.

[0079] The method for using the magnesium-calcium smelting mechanized device, the steps of the method for using are as follows:

[0080] S1. Transfer the pressed pellets into the inner sleeve through the top opening of the inner sleeve;

[0081] S2, quickly loading the inner sleeve in step S1 into the reduction tank through a mechanical device;

[0082] S3, evacuating the reduction tank in step S2, and then heating to reduce magnesium and calcium;

[0083] S4, after the heating reduction in step S3 is fully completed, the vacuum of the reduction tank is destroyed, the pre-calcination barrel is placed in a good position, and then the inner sleeve is pulled out from the inside of the pre-calcination barrel through a hook and enters the pre-calcination barrel, and then both ends of the pre-calcination barrel are covered with insulation materials, and the dolomite and limestone in the pre-calcination barrel are pre-calcined by using the sensible heat of the reduction slag inside the inner sleeve;

[0084] S5, when the temperature of the inner sleeve in step S4 is consistent with the temperature of dolomite and limestone, the pre-calcination process stops, at which time the temperature of the reduced slag inside the inner sleeve is 670°C, and the remaining sensible heat of the reduced slag is used for waste heat boiler or the reduced slag directly enters the slag yard for air cooling;

[0085] S6, weighing the dolomite and limestone pre-calcined products in the pre-calcined barrel in step S5, and calculating the weight loss rate. If the weight loss rate is qualified, the products are sent to the crushing and grinding process. If the weight loss rate is not enough, the products are sent to the rotary kiln for further calcination while hot.

[0086] Example 5

[0087] A mechanized device for smelting magnesium and calcium, the mechanized device for smelting magnesium and calcium is made of heat-resistant steel with a thickness of 3mm, an inner sleeve with an outer diameter smaller than the inner diameter of a reduction tank by 5mm, the top opening angle θ=22°, and the length of the inner sleeve is equal to the reduction tank; the thickness of the longitudinal reinforcing plate is 10mm, the material is 310S heat-resistant steel, 2 partitions are provided, 20 holes with a diameter of 30mm are opened on the partitions and end plates, and the material of the partitions is 310S heat-resistant steel. 170 kg of reduction balls are set in the inner sleeve. A hook is welded at the end of the inner sleeve, and the hook is made of 310S heat-resistant steel. The inner diameter of the pre-calcined barrel is 5mm larger than the outer diameter of the inner sleeve, the outer diameter is 650mm, and the length is equal to the reduction tank. The inner barrel of the pre-calcined barrel is made of 304 stainless steel, and the outer barrel is made of 45# steel rolled into a barrel shape and welded.

[0088] The method for using the magnesium-calcium smelting mechanized device, the steps of the method for using are as follows:

[0089] S1. Transfer the pressed pellets into the inner sleeve through the top opening of the inner sleeve;

[0090] S2, quickly loading the inner sleeve in step S1 into the reduction tank through a mechanical device;

[0091] S3, evacuating the reduction tank in step S2, and then heating to reduce magnesium and calcium;

[0092] S4, after the heating reduction in step S3 is fully completed, the vacuum of the reduction tank is destroyed, the pre-calcination barrel is placed in a good position, and then the inner sleeve is pulled out from the inside of the pre-calcination barrel through a hook and enters the pre-calcination barrel, and then both ends of the pre-calcination barrel are covered with insulation materials, and the dolomite and limestone in the pre-calcination barrel are pre-calcined by using the sensible heat of the reduction slag inside the inner sleeve;

[0093] S5. When the temperature of the inner sleeve in step S4 is consistent with the temperature of dolomite and limestone, the pre-calcination process stops. At this time, the temperature of the reduced slag inside the inner sleeve is 640° C. The remaining sensible heat of the reduced slag is used for the waste heat boiler or the reduced slag directly enters the slag yard for air cooling;

[0094] S6, weighing the dolomite and limestone pre-calcined products in the pre-calcined barrel in step S5, and calculating the weight loss rate. If the weight loss rate is qualified, the products are sent to the crushing and grinding process. If the weight loss rate is not enough, the products are sent to the rotary kiln for further calcination while hot.

[0095] Example 6

[0096] A mechanized device for smelting magnesium and calcium, the mechanized device for smelting magnesium and calcium is made of 310 heat-resistant steel with a thickness of 2mm, and the outer diameter of the inner sleeve is 5mm smaller than the inner diameter of the reduction tank, the top opening angle θ=16°, and the length of the inner sleeve is the same as the reduction tank; the thickness of the longitudinal reinforcement plate is 5mm, and the material is 310 heat-resistant steel, and 4 partitions are provided, and 10 holes with a diameter of 40mm are opened on the partitions and end plates, and the material of the partitions is 310 heat-resistant steel. The inner sleeve contains 175 kg of reduction balls. A hook is welded at the end of the inner sleeve, and the hook is made of 310 heat-resistant steel. The inner diameter of the pre-calcined barrel is 5mm larger than the inner sleeve, the outer diameter is 580mm, and the length is the same as the reduction tank. The inner barrel of the pre-calcined barrel is made of 304 stainless steel, and the outer barrel is made of 45# steel coiled into a barrel shape and welded.

[0097] The method for using the magnesium-calcium smelting mechanized device, the steps of the method for using are as follows:

[0098] S1. Transfer the pressed pellets into the inner sleeve through the top opening of the inner sleeve;

[0099] S2, quickly loading the inner sleeve in step S1 into the reduction tank through a mechanical device;

[0100] S3, evacuating the reduction tank in step S2, and then heating to reduce magnesium and calcium;

[0101] S4, after the heating reduction in step S3 is fully completed, the vacuum of the reduction tank is destroyed, the pre-calcination barrel is placed in a good position, and then the inner sleeve is pulled out from the inside of the pre-calcination barrel through a hook and enters the pre-calcination barrel, and then both ends of the pre-calcination barrel are covered with insulation materials, and the dolomite and limestone in the pre-calcination barrel are pre-calcined by using the sensible heat of the reduction slag inside the inner sleeve;

[0102] S5, when the temperature of the inner sleeve in step S4 is consistent with the temperature of dolomite and limestone, the pre-calcination process stops, at which time the temperature of the reduced slag inside the inner sleeve is 630°C, and the remaining sensible heat of the reduced slag is used for waste heat boiler or the reduced slag directly enters the slag yard for air cooling;

[0103] S6, weighing the dolomite and limestone pre-calcined products in the pre-calcined barrel in step S5, and calculating the weight loss rate. If the weight loss rate is qualified, the products are sent to the crushing and grinding process. If the weight loss rate is not enough, the products are sent to the rotary kiln for further calcination while hot.

[0104] In the above scheme, the present invention uses the matching structure of the inner sleeve, the pre-calcining barrel and the reduction tank in the structure of the magnesium-calcium smelting mechanized device, and utilizes the structure of the top opening of the inner sleeve, the longitudinal reinforcing plate and the perforated partition plate to facilitate the reduction process, and the reduction slag is completely removed and transferred to the pre-calcining barrel to efficiently utilize the waste heat of the reduction slag.

[0105] The positional relationship and connection relationship of the inner sleeve structure and its internal components in the device structure of the present invention can improve the reduction efficiency of magnesium and calcium and the metal purity. In particular, the hook setting of the inner sleeve makes the reduction slag removal efficient and does not require manual slag cleaning later.

[0106] The hook arrangement of the inner sleeve and the position arrangement of the pre-calcining barrel of the present invention enable the reducing slag to quickly and completely come out of the reducing tank and enter the pre-calcining barrel to pre-calcine dolomite and limestone, thereby minimizing the loss of heat radiation, achieving high heat energy utilization efficiency and reducing the cost of magnesium-calcium smelting.

[0107] The present invention, through the above-mentioned device structure setting and matching use method, can not only realize rapid loading and rapid removal of reduced slag, but also use sensible heat for pre-calcination of dolomite and limestone to effectively reduce the energy consumption of the calcination process; and the sensible heat utilization process of the reduced slag can be highly synchronized with the metal magnesium and calcium smelting process, which is beneficial to large-scale industrial production.

[0108] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A mechanized device for smelting magnesium and calcium, characterized in that: The magnesium-calcium smelting mechanized device comprises a reduction tank, a pre-calcination barrel and an inner sleeve, wherein a longitudinal reinforcing plate is arranged inside the inner sleeve, an opening is provided at the top of the inner sleeve, a plurality of partitions are arranged at both ends and the middle of the inner sleeve, each partition is provided with a plurality of through holes, and a hook is provided at the end of the inner sleeve; The inner sleeve is concentrically arranged in the reduction tank and the pre-calcination barrel, the pellets in the reduction tank are arranged in the inner sleeve, and the dolomite and limestone in the pre-calcination barrel are arranged between the inner wall and the outer wall of the pre-calcination barrel.

2. The mechanized magnesium-calcium smelting device according to claim 1 is characterized in that: The outer diameter of the inner sleeve is 2-10 mm smaller than the inner diameter of the reduction tank.

3. The mechanized magnesium-calcium smelting device according to claim 1 is characterized in that: The length of the longitudinal reinforcing plate is the same as the length of the heating section of the reduction tank.

4. The mechanized magnesium-calcium smelting device according to claim 1 is characterized in that: The height of the longitudinal reinforcing plate is 3-5 cm smaller than the inner diameter of the reduction tank.

5. The mechanized magnesium-calcium smelting device according to claim 1 is characterized in that: The bottom of the longitudinal reinforcing plate is connected to the inner sleeve by welding.

6. The mechanized magnesium-calcium smelting device according to claim 1 is characterized in that: The plurality of partitions are 4-5 partitions with a thickness of 3-5 mm.

7. The mechanized magnesium-calcium smelting device according to claim 1 is characterized in that: The plurality of through holes are at least 10 small holes with a diameter of 10-30 mm, the small holes are arranged randomly, and the distance between the small holes is 30-50 mm.

8. The mechanized magnesium-calcium smelting device according to claim 1 is characterized in that: The opening is a fan-shaped opening with an opening angle of 10-30° arranged at the top of the inner sleeve.

9. The mechanized magnesium-calcium smelting device according to claim 1 is characterized in that: The pre-calcination barrel is a hollow barrel, and the inner diameter of the barrel is 3-5 mm larger than the outer diameter of the inner sleeve.

10. The method for using the magnesium-calcium smelting mechanized device according to any one of claims 1 to 9, characterized in that: The steps of the method of use are as follows: S1. Transfer the pressed pellets into the inner sleeve through the top opening of the inner sleeve; S2, quickly loading the inner sleeve in step S1 into the reduction tank through a mechanical device; S3, evacuating the reduction tank in step S2, and then heating to reduce magnesium and calcium; S4, after the heating reduction in step S3 is fully completed, the vacuum of the reduction tank is destroyed, the reduced magnesium and calcium are pulled out, and then the inner sleeve and the reduced slag inside are pulled out together through a hook through a mechanical device; S5, pulling out the inner sleeve through the hook in step S4 and transferring it into a pre-calcining barrel, and pre-calcining the dolomite and limestone in the pre-calcining barrel by using the sensible heat of the reducing slag inside the inner sleeve; S6. When the temperature of the inner sleeve in step S5 is consistent with the temperature of dolomite and limestone, the pre-calcination process stops. At this time, the temperature of the reduced slag inside the inner sleeve is 600-700°C, and the remaining sensible heat of the reduced slag is used for waste heat boiler or the reduced slag directly enters the slag yard for air cooling.

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