• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a device for post-roasting metal oxide obtained by pyrohydrolysis in a reactor, wherein the reactor comprises at least one reactor bottom with at least one discharge opening for the metal oxide, characterized in that connected below the reactor bottom and on the outside of the reactor, a post-roasting device in the form of a Bunk oven (1) is provided, wherein the post-roasting device is further equipped with lines for supplying a gaseous heat carrier and at least two floors (2), which floors (2) at least one discharge opening (3) and a conveyor device per floor.
    公开号:AT515771A1
    申请号:T325/2014
    申请日:2014-05-02
    公开日:2015-11-15
    发明作者:
    申请人:Key Technologies Ind Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a device for Nachrösten vonpyrohydolytic, for example in a Sprühöstreaktor, recovered metal oxide.
    In the known roasting reactors, in particular spray roasting agents, the crude oxide collects in the lower region of the reactor. During spray roasting, deposits may be formed on the reactor wall or in the area of the burner. These agglomerates will continuously dissolve and fall down. In order to comminute these agglomerates, a comminution device, for example a roll crusher or a cone crusher, is generally provided in the region of the reactor outlet. The crude oxide is discharged from the reactor via a cellular wheel.
    However, the raw metal oxide discharged from the reactor contains residual contents of unroasted metal salts, for example metal chlorides. Therefore, to achieve certain oxide qualities, it is necessary to post-roast the resulting crude oxide in a further step.
    EP0895952A1 discloses a spray roasting reactor in which a cone crusher is provided in a discharge cone. The crude oxide formed in the spray roasting reactor passes into the discharge cone, whereby any agglomerates are comminuted. As a result, the crude oxide passes into a heated area below the cone crusher, in which a post-roasting of the crude oxide takes place. At the bottom of Nachröstbe¬reiches a Krählwerk is attached, which conveys the nach¬ to roasted oxide with constant mixing and thus ver¬ bound continuous renewal of the reaction surface for Oxidaustrag.
    DE10006990A1 discloses a process for the recovery of acids from metal-containing solutions of these acids. To this end, a spray roasting reactor is used, in which, for example, a post-roasting zone with a crusher or downstream of the reactor a rotary kiln, a fluidized bed or a heated conveyor, such as a screw, is arranged to improve the oxide quality by means of roasting.
    The object of the present invention is to provide an alternative apparatus for post-roasting pyrohydrolitically-derived metal oxide, by the operation of which oxide qualities with a low metal salt content can be produced.
    This object is achieved according to the invention by means of a device for roasting pyrohydrolytically obtained metal oxide in a reactor, the reactor comprising at least one reactor bottom with at least one discharge opening for the metal oxide and a downstream roasting device below the bottom of the reactor and on the outside of the reactor is provided in the form of a multi-level oven, wherein the Nachröstvorrichtung further equipped with lines for supplying a gaseous heat carrier and wenigs¬tens 2, preferably 2 to 8, more preferably 2 to 6, most preferably 3 to 4 trays comprises, which bottoms We¬nigstens a discharge and a conveyor device per floor.
    The residence time of the metal raw oxide in the Nachröstvorrich¬tung is among other things by the number of soils be¬stimmt.
    At the bottom of the reactor there may also be provided a conveying device with which, on the one hand, the raw-oxide agglomerate rate which has formed on the reactor wall or in the region of the burner can be comminuted, since these agglomerates can only be loosely connected and easily ground. There are therefore no further crushing devices required. On the other hand, the conveying device causes the crude oxide located at the bottom of the reactor to be forcibly discharged via the at least one discharge opening in the bottom of the reactor into the after-roasting device, that is to say the furnace.
    The discharge openings in the individual trays can be arranged from bottom to bottom in any direction offset from one another.
    The conveyors optionally provided on the reactor bottom and on each of the floors of the blast furnace are preferably crushers.
    These Krählwerke include at least one Krählbal-ken, which can be equipped with a number of Krählzähnen, Schau¬feln and the like easily determined by the expert according to the Fördervor¬ numbers.
    In an advantageous embodiment of the invention, the post-roasting device comprises lines for supplying a gaseous heat carrier, wherein the gaseous heat carrier is preferably introduced into the multi-deck oven through at least one line per existing bottom. As a result, an efficient use of energy is ensured and the exhaust gas from the after-roasting from the multiple-hearth furnace can escape directly into the overlying reactor, from which it is withdrawn together with the exhaust gas produced in the roasting reactor and further treated.
    In a further advantageous embodiment of the invention, the crushers on the trays of the kiln oven as well as optionally the crusher above the reaction tray are arranged on a shaft which is driven by means of a motor. The engine speed as well as the number of trays present in the post-roasting device make it possible to set a desired residence time of the crude oxide in the post-roasting device.
    The method for roasting in a device as described above takes place in such a manner that the gaseous heat carrier, for example hot air, which may optionally also comprise steam, at a temperature of from 300 to 800 ° C., is preferred 400 to 700 ° C, more preferably 450 to 600 ° C, or 400 to 550 ° C, is introduced with ei¬ner flow rate of 400-800 Bm3 / h in Nachröst¬vorrichtung.
    The unit Bm3 / h refers to operating cubic meters of gaseous heat transfer medium per hour, that is to say the gaseous amount of heat carrier per hour, which is introduced into the multi-stage furnace at the operating temperature and the delivery pressure via the line system.
    The residence time of the crude oxide in the post-roasting apparatus set as described above is 2 to 180 minutes, preferably 10 to 150 minutes, more preferably 20 to 100 minutes, still more preferably 20 to 50 minutes and most preferably 20 to 40 minutes. By controlling the residence time of the crude oxide in the post-roasting device, too long heating (deadburning) of the metal oxide can be avoided, which can especially occur with MgO, and prevents its rehydration and further use.
    The advantages of the invention are, on the one hand, that forced discharge of the metal oxide from the reactor takes place in combination with a post-roasting, and, on the other hand, that no additional components are required on the reactor bottom, and finally that the energy is used efficiently, since the exhaust gas the Nachröst¬vorrichtung is passed directly into the reactor, which also just has the consequence that a separate exhaust gas treatment of the offgas of the Nachröstvorrichtung is unnecessary.
    In the following, the invention will be further elucidated with the aid of the non-limiting examples and the accompanying figures. Where:
    Figure 1 is a vertical section through a erfindungsge¬mäße roasting device; and
    Figure 2 is a plan view of a bottom of erfinderge¬mäßen Nachröstvorrichtung.
    example 1
    A spray toasting reactor (not shown) for roasting MgCl2 designed for a power to produce about 300 kg / h of MgO is equipped with a five-bottomed finisher 2 (finalizer) 1. The magnesium raw oxide passes out of the reactor (not shown) into the multi-deck furnace 1. Each base comprises 2 discharge ports 3 (not shown in Fig. 1) and one conveyor per tray, in the form of a crusher, comprising folding bars 4 provided with cutting teeth 5, whereby the Rohoxid zwangswei¬se is conveyed from an overlying soil to an underlying soil. The Krählbalken 4 are arranged on a shaft 6, which is driven by a motor 7.
    Lines (not shown) for supplying hot air to each of the floors 2 in the multi-deck furnace 1 are provided. The air supplied at a flow rate of 400-800 Bm3 / h has a temperature of 450 to 600 ° C. Via the speed set at the engine 7, the desired residence time of the crude oxide in the multiple-hearth furnace 1 is set to 20 to 40 minutes. The roasted magnesium oxide is removed from the multiwell 1 via the nozzle 9.
    Example 2
    A spray toasting reactor (not shown) for roasting FeCl 2 designed to produce about 300 kg / h of Fe 2 C> 3 is equipped with a five-bottomed 2 stage finisher 1 (finalizer). The iron raw oxide passes from the reactor (not shown) into the multiwell furnace 1. In this, each tray comprises two discharge openings 3 (not shown in Fig. 1) and one conveyor per tray, in the form of a counter, comprising selvedge beams 4 connected to biting teeth 5 whereby the raw oxide is forcibly conveyed from an overlying soil to an underlying soil. The Krählbalken 4 are arranged on a Wel¬le 6, which is driven by a motor 7.
    Lines (not shown) for supplying hot air to each of the floors 2 in the multi-deck furnace 1 are provided. The air supplied at a flow rate of 400-800 Bm3 / h has a temperature of 400 to 550 ° C. Via the speed set at the engine 7, the desired residence time of the crude oxide in the multiple-hearth furnace 1 is set to 20 to 40 minutes. The roasted iron oxide is removed from the multiwell 1 via the nozzle 9.
    权利要求:
    Claims (8)
    [1]
    1. An apparatus for roasting pyro-hydrolytically obtained metal oxide in a reactor, wherein the reactor comprises at least one reactor bottom with at least one discharge opening for the metal oxide, characterized in that connected below the reactor bottom and the outside of the reactor Roasting device is provided in the form of a multi-level oven (1), wherein the post-roasting device is further equipped with conduits for supplying a gaseous heat carrier and comprises at least two trays (2), which trays (2) at least one discharge opening (3 ) and one conveyor per floor.
    [2]
    2. Apparatus according to claim 1, characterized in that the conveyor per floor (1) is a Krählwerkist.
    [3]
    A device according to one of claims 1 or 2, characterized in that each of the crushers comprises at least one selection bar (4).
    [4]
    4. Device according to one of claims 1 to 3, characterized in that per floor (1) at least one Lei¬tung for supplying the gaseous heat carrier is vorgese¬hen.
    [5]
    5. Device according to one of claims 1 to 4, characterized in that the Krählwerke on a shaft (6) are arranged, which shaft (6) by a motor (7) is driven.
    [6]
    6. A method for post-roasting of pyro-hydrolytically obtained metal oxide in a Vorrich- device as defined in claim 1, characterized gekennzeich¬net that the gaseous heat carrier at a flow rate of 400 to 800 Bm3 / h in Nachröstvor ¬richtung is introduced.
    [7]
    7. The method according to claim 6, characterized in that the gaseous heat carrier hot air at a Tempe¬rature of 300 to 800 ° C.
    [8]
    Process according to one of claims 6 or 7, characterized in that the residence time of the metal oxide in the post-roaster is from 2 to 180 min.
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    同族专利:
    公开号 | 公开日
    AT515771B1|2021-04-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2754844A1|1977-12-09|1979-06-13|Kloeckner Humboldt Deutz Ag|FLOOR OVEN|
    US20020031469A1|1997-08-06|2002-03-14|Albert Lebl|Process and apparatus for the extraction and regeneration of acids from spent acids|
    EP1253112A1|2001-04-25|2002-10-30|Andritz AG|Process and apparatus for recovering metal oxides|
    EP2784186A1|2013-03-27|2014-10-01|CMI UVK GmbH|Process for recovering metal oxide particles from a spent acid solution containing metal salts|CN112121449A|2020-09-22|2020-12-25|杭州嘉威机械配件有限公司|Laboratory is with miniature spray drier convenient to remove|DE2529847C2|1975-07-04|1984-08-09|Klöckner-Humboldt-Deutz AG, 5000 Köln|Deck furnace and method for the thermal treatment of sludge-like materials, in particular hydrated magnesite sludges|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA325/2014A|AT515771B1|2014-05-02|2014-05-02|Device and method for post-roasting metal oxides|ATA325/2014A| AT515771B1|2014-05-02|2014-05-02|Device and method for post-roasting metal oxides|
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