TW200403345A - Salt furnace - Google Patents

Abstract

A salt furnace is receivable within a vessel which contains molten magnesium/magnesium alloy. The salt furnace comprises a body for isolating a salt melt within the salt furnace from molten magnesium/magnesium alloy in the vessel and through which the salt melt is heated by the molten magnesium/magnesium alloy, access means for introducing magnesium bearing material into the salt melt, and transfer means for transferring molten metal from above the salt melt in the salt furnace into the vessel.

Description

200403345 V. Description of the invention (l) [Technical field to which the invention belongs] The present invention relates to the practice of magnesium casting, and more particularly to a salt furnace that can be operated in a container containing a molten magnesium / magnesium alloy. [Prior Art] US Patent No. 4,385,931 relates to a continuous magnesium refining method that uses sludge to form sludge, and a refining furnace used in this method. The refining furnace has a series of continuously configured precipitation tanks. The tank is separated from each other by a plurality of vertical partition walls that do not extend to the bottom of the furnace. A layer of molten salt located at the bottom of the refining furnace communicates with the adjacent sedimentation tank through the bottom. The adjacent sedimentation tank also passes through the molten salt surface. The openings in the middle partition board communicate with each other. Raw molten magnesium (raw m〇lten magnesium) is put into a salt layer under the molten metal layer in a precipitation tank. Impurities in the magnesium precipitate in the salt layer to form a sludge, which is refined. The magnesium rises and opens through the intermediate partition j to the adjacent sedimentation tank. This process is repeated in subsequent sedimentation tanks. The magnesium is gradually refined until the magnesium is removed from the last sedimentation tank. Australian Patent No. 650290 It extends the method of US Patent No. 4,385,931, and provides a method for continuous refining of magnesium, which is basically based on US patents. The method of remelting (and subsequent refining) procedures of metal waste and returned metal, the remelting system pumps molten salt onto a metal waste placed in a basket in the furnace, and finally the molten metal flows down to remelting and refining. The refining in the furnace is generally performed according to the method of US Pat. No. 4,385,931.

200403345 V. Description of the invention (2) Various kinds of waste waste produced by electrolytic manufacturing of town metal and magnesium casting are difficult to handle and dispose of and contain magnesium value. These wastes include magnesium in the tank, sludge in the furnace, slag in the furnace, and skimmer in the furnace. And the materials removed from the equipment (such as pumps) in the magnesium casting == k magnesium capacity Is, basically, the slag and the skimmer in the furnace are placed on the first-grade channel, which allows the burning of the flame = the desired smoke Loss of gas and magnesium value can help you deal with it to improve the working environment and recover the value. [What's new] "i Invention provides-a kind of salt furnace '纟 can be accommodated-in a container containing dissolved magnesium / ballast alloy, the salt furnace includes: (a)-to separate the molten salt in the salt furnace from The body of the molten magnesium / magnesium alloy in the container, and the molten magnesium / magnesium alloy transmits heat through the body to add a molten salt; (b) an access device for introducing a magnesium-containing material into the molten salt; and (c) A conveying device for conveying the molten metal above the molten salt in the salt furnace to the container. The salt furnace is preferably removable or accommodated in the container, which can be lifted and lowered by a crane device. The salt furnace preferably further includes a support member extending outward from the upper half of the body and placed on the periphery of the opening on the lid of the container. ^ The orderer can be any type that can withstand molten magnesium / Magnesium alloy metallurgical capacity 1 'It includes a depletion furnace and the furnace body described in US Patent No. "MI" and Australian Patent No. 650290 s. Basically' the smelting salt is used for electrolysis of magnesium from anhydrous gasification Manufacture of magnesium

Page 6 200403345

It is formed by the salts in the electrolytic cell, such as calcium chloride, sodium chloride and sodium fluoride. For example, the salt mixture includes magnesium chloride, a particularly good molten salt includes 22% by weight of sodium chloride and magnesium chloride, and calcium fluoride. 2 weight 50% by weight, 26% by weight of calcium chloride, the grooves are used in the other types, but the surface can be made, and the material included in the molten gold material is usually the best. Way The like device on the top of the salt furnace is best to be used with any shape, such as a circle, a square, or the operating environment to transfer to the molten soft steel plate and the refractory in the salt furnace. It is adopted, however, the opening, opening or closing of the inferior price should be opened and closed on the top of the furnace. The salt furnace has a bottom-upwardly extending angular shape, a pentagonal shape, and a rectangular shape. Any temperature of the salt is higher than that of the molten salt. The trough can be made of a material, and can withstand the residual corrosion resistance and the partial position of the surface. It is best to have the shape of the body that can extend the wall, etc., molten magnesium, the material, the high strength of the dissolved salt can be entered in it. The device may include a lid with a hole or any shape, the bottom but for the convenience of making the temperature in the container can remove heat from the 'better material and high stability inside and / or

The conveying device may adopt an orifice on the body of a weir-shaped salt furnace. The height of the opening is such that when the molten salt in the salt furnace is melted into the container, the opening may be formed to be opened or closed. The molten salt and the lifting device area on the molten salt dissolved in the surface of the container and a storage area, so that the storage area is preferably or in the form of a molten metal surface formed in the container, When the molten metal rises, there is a closing device such as a gate valve flowing from the salt furnace, which may preferably include a metal furnace for lifting the molten metal of the salt furnace to a point where the molten metal can flow, and the salt furnace is preferably provided with a working molten salt downward. Arrange the cause of the workspace

Page 7 200403345 V. Description of the invention (4) Dazzle the salt upwards. The work area and the storage area are preferably separated by a baffle, and the work area and the storage area are in liquid communication below the baffle. The storage area is preferably arranged to introduce gas into it for downward discharge. For melting salts, the gas is preferably an inert gas such as argon. [Embodiment] The salt furnace 10 roughly includes a bottom 495mmX 390mm 12, two walls 495mmX 1 700mm 14a, 14b, two 390mmXl 700mm walls 16b, a furnace roof 17 and a 50mm wide steel plate made of 4mm The formed flange 18 is welded together, the flange 18 has four rings 20, an overhead key crane or other similar device lifts the salt furnace 10 by four rings 20, and then is processed by a town The rectangular opening on the container lid of the container (not shown in the figure) is placed in it. The rectangular opening is made in a size that can pass through the salt furnace, so that the flange 18 can be seated right. &Amp; 祖 # ^ ^ ^ ^ On the periphery of the rectangular opening on the bowl, it is used to support the salt stove 10 in its working position. Manufactured salt furnace 10> When it melts, its branch 380 kg of salt mixture 'part 12 is counted as eight places, and its height from the bottom of the contact weight% gasification town ^ meeting = best It is vaporized so that 50% by weight, the chlorine system is put 2 times by weight 1 ^ from the opening 22 of the furnace roof, and about 2% by weight, which is shown in the salt mixture diagram-part of the opening 22 can be closed by the hinge cover 23, Put it in, and with this capacity !, the salt mixture can be solidified, in addition, the molten magnesium in the salt mixture is not shown in the figure), and it will melt inside. It can also be pumped into the salt furnace 10 through the opening 22 in the molten state.

200403345 V. Description of the invention (5) A 4mm thick soft steel baffle 24 is welded between the walls 14a and 14b and extends from the furnace roof 17 to a point B, which is 10mm from the bottom 12 and 163 from the wall At 100 mm, the baffle 24 roughly divides the salt furnace 10 into a storage area 26 and a working area 28, a nozzle 30 and a regulator (not shown) are arranged to couple an argon gas source (not shown) To transport argon gas to the upper half 32 of the storage area 26 above the molten salt level A. A long soft steel pipe 34 with an inner diameter of 50mm is welded to the wall 16b ----- It is used to transport molten metal from the salt furnace 10 to the container (not shown in the figure). In use, the molten salt occupies the position of the salt furnace 10 to the liquid level A and is heated by heat transfer through the bottom 12 and the walls 14a, b, 16a, b. Basically, the molten salt = temperature is about 520 ~ 660 ° C However, the actual temperature depends on the amount of heat transferred to the salt. Magnesium-containing materials such as scum and skimmers from the container (not shown) are placed into the molten salt in the work area 28 through the opening 22. Impurities settle ^ The bottom of the work area 28 becomes sludge. Due to the density difference between the molten metal and the molten salt, the molten metal floats on the molten salt to form a layer. A grid / recycling (not shown) can be placed on the work. Zone 28 is used to capture and check. When the town-containing material is: into the salt furnace 10, its volume will gradually increase until it melts the metal layer ^, the orifice is 36%, and it will flow into the container from the steel pipe 34 through the orifice 36 (In the picture, it is shown that 'I hope to complete the transfer of molten metal before the volume increases, and avoid oxidation of the molten metal in the second furnace. This can be caused by the introduction of sufficient argon gas to enter the main shirt through the nozzle 30. Part 32, row down the molten salt on the baffle 24, 7 I, 26, and then up Discharge the molten salt in the working area 28, = the molten metal layer above the molten salt in the area 28 reaches the orifice 36. On the soil, the molten metal in the container is covered by a shielding gas to protect it.

Page 9 200403345

Shielding gas can also be introduced into the container and diffused from the container (for protection from oxidation, if desired, inside the furnace 10, or the salt furnace 10 can be provided with shielding gas such as perforations on the walls 14a, b, 16a, b) . EXAMPLES Example 1: Floating scum treatment in a salt furnace located in a magnesium furnace (as shown in Figures i and 2) ^, the scum on the surface of molten magnesium in the magnesium furnace is periodically removed and placed In the money furnace, compared with the dross placed in the flow channel, when the scum is treated according to Example 1, it is obvious that the smoke is eliminated immediately, and the surface of the molten salt in the salt furnace is also obvious. Example 2: Pump cleaning The molten metal pump used in the example magnesium furnace to pump molten magnesium is disassembled from the magnesium furnace f \ Cleaning in the salt furnace of Example 1, which is to cover the pump covered with molten magnesium from the magnesium furnace Disassemble it and put it into the salt furnace. When the exhaust of the molten magnesium combustion 1 stops, the pump will be put into the salt furnace, and Douyapu will move it from the salt furnace. , Σ = A layer of melting town was found on the surface of the dissolved salt in the furnace. Example 3: Recovery of scum 'After the scum is returned, the magnesium furnace' is configured for artificial magnesium furnace and salt furnace. As in Example 1, the magnesium furnace is filled with rain from the beginning of pure magnesium harvest, and the second furnace is maintained at its operating temperature for two hours. , Remove scum every 15 minutes and send it to the salt furnace immediately

_ 200403345 V. Description of the invention (7) = Furnace is formed, 5 minutes before each time to go to the side, protect the body of the town furnace, and the town in the town furnace is not covered by the floating Qing, Magnesium; Zhiyan ", every time you go to remove 4 ~ 6 from the magnesium furnace, Zhongming 2 lost about 50 kilograms. During the whole demolition operation, there is obviously a small amount of smoke. 罘 面 回 Πϊΐΐί 管 34 Before the height, the molten salt table in the salt furnace is regularly taken to the ingot; r Φ A ', "IL is returned to the magnesium furnace, and the molten magnesium is recovered from the salt furnace by radon. A total of 46 kg of magnesium is recovered. It means that 92% of the scum is recovered. Αν 代 = The scope of the following patent applications and the foregoing description of the invention, except for the second package = other places, because it means language or necessary meaning, which indicates that the characteristics are not included. The meaning, that is, the existence of a specific sign or 2 does not exclude that the embodiments of the present invention are further advanced-step special = / Yue Chu understand {: Here we refer to the prior art

Cr and other countries do not recognize Ren-these documents form part of the general knowledge of each field. 200403345 Brief description of drawings Figure 1 is a side view of the salt furnace of the present invention; and Figure 2 is a plan view of the salt furnace of Figure 1. [Simple description of component symbols] Salt furnace 10 Bottom 12 Wall 14a, 14b Wall 16a, 16b Furnace top 17 Flange 18 Lifting ring 20 Opening 22 Compared with key cover 2 3 Baffle 24 Storage area 26 Work area 28 Nozzle 30 Upper half 3 2 Steel tube 34 orifice 36

Page 12

Claims (1)

200403345 Sixth, the scope of patent application 1. A salt furnace that can be contained in / contains a container of molten magnesium / magnesium alloy, the salt furnace includes ... (a)-to separate the molten salt in the salt furnace from the The body of the molten magnesium / magnesium alloy in the container, and the molten magnesium / magnesium alloy transmits heat through the body to heat the molten salt; (b) an access device for placing a magnesium-containing material into the molten salt; and (c) A conveying device for conveying the molten metal above the melting fee in the salt furnace to the container 2 The salt furnace as described in the first patent application scope, wherein the salt furnace can be removed or contained in the container . 3. The salt furnace as described in item 1 of the scope of patent application, the salt furnace further includes a support member extending from the upper half of the main body and erected on the periphery of the opening of the container lid. 4. The salt furnace according to any one of claims 1 to 3 in the scope of patent application, wherein the access device includes an opening formed on the top of the salt furnace. 5. The salt furnace according to item 1 of the patent application scope, wherein the conveying device includes an opening formed in the body of the salt furnace for molten metal to pass through. 6. The salt furnace according to item 1 of the patent application scope, further comprising a lifting device for lifting molten salt in the salt furnace. 7. The salt furnace according to item 1 of the scope of patent application, wherein the salt furnace is provided with a working area and a storage area, so that the molten salt in the storage area is discharged downwards and the molten salt in the working area is discharged upwards. 8. The salt furnace according to item 7 of the scope of the patent application, wherein the storage area and the work area are separated by a baffle, and under the baffle, the work area and the storage area are liquid Connected. Page 13 200403345 Page 14