CN101563137B - Method of concentrating a bayer process liquor - Google Patents

Method of concentrating a bayer process liquor Download PDF

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CN101563137B
CN101563137B CN 200780035168 CN200780035168A CN101563137B CN 101563137 B CN101563137 B CN 101563137B CN 200780035168 CN200780035168 CN 200780035168 CN 200780035168 A CN200780035168 A CN 200780035168A CN 101563137 B CN101563137 B CN 101563137B
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bayer process
water
waste
gas
method
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CN 200780035168
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Chinese (zh)
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CN101563137A (en )
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迪安·伊利耶夫斯基
彼得·斯图尔特·海
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阿尔科澳大利亚有限公司
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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00Compounds of aluminium
    • C01F7/02Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/06Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
    • C01F7/0606Make-up of the alkali hydroxide solution from recycled spent liquor
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00Compounds of aluminium
    • C01F7/02Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/44Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
    • C01F7/441Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination

Abstract

用于浓缩拜耳法废液的方法,该方法包括的步骤有:从拜耳法煅烧炉废气中回收热量;将至少一部分回收的热量施用于拜耳法废液;以及从拜耳法废液中蒸发水分,从而浓缩拜耳法废液。 A method for concentrated waste Bayer process, the method comprising the steps of: recovering heat from the calciner exhaust gas Bayer process; the heat is applied to at least a portion of the recovered waste Bayer process; and evaporating water from the waste in the Bayer process, thus concentrated waste Bayer process.

Description

浓缩拜耳法溶液的方法 The method of Bayer process solution was concentrated

技术领域 FIELD

[0001] 本发明涉及一种浓缩拜耳法溶液的方法。 [0001] The present invention relates to a concentrated Bayer process solution. 具体而言,本发明涉及利用从废弃的拜耳法气体中回收的热量来浓缩拜耳法溶液的方法。 In particular, the present invention relates to the use of heat recovered from the waste gas in the Bayer process solution-concentrated Bayer process.

背景技术 Background technique

[0002] 拜耳法广泛用于从含铝的矿石(例如铝土矿)中生产氧化铝。 [0002] The Bayer process is widely used in the aluminum-containing ores (e.g., bauxite) in the production of alumina. 该方法包括,在通常被称作溶出的工艺中,在高温下将含氧化铝的矿石与再生的苛性铝酸盐溶液接触。 The method comprises, in a process commonly referred to elution, the contact at high temperature caustic aluminate solution alumina-containing ore and regeneration. 在有些情况下,铝土矿会伴有大量的有机材料,其中一部分造成在生成的溶液中存在一定的有机化合物。 In some cases, the bauxite will be accompanied by a large amount of organic material, wherein a portion of the result in the presence of certain organic compounds in the resulting solution.

[0003] 在溶液冷却之后,加入氢氧化铝作为晶种以诱使更多的氢氧化铝的从其中沉淀出来。 [0003] After the solution was cooled, added as a seed aluminum hydroxide to induce further wherein the aluminum hydroxide is precipitated. 从苛性铝酸盐溶液中分离出沉淀的氢氧化铝,其中一部分氢氧化铝作为晶种重复利用,而其余部分作为产物被回收。 Separated from the caustic aluminate solution, precipitated aluminum hydroxide, wherein part of the aluminum hydroxide as a seed recycling, while the remaining portion is recovered as product. 剩下的苛性铝酸盐溶液被再循环用于含铝矿石的进一步溶出。 The remaining caustic aluminate solution is recycled for further dissolution of the aluminum-containing ore.

[0004] 然后,在公知的煅烧工艺中,加热回收的氢氧化铝来生产氧化铝。 [0004] Then, in the known calcination process, the recovered heat to produce aluminum hydroxide alumina. 当氢氧化铝根据下列反应产生氧化铝时,煅烧反应的副产物是水: When aluminum hydroxide is aluminum produced according to the following reaction, byproduct water calcination reaction is:

[0005] 2A1 (OH) 3 — A1203+3H20 [0005] 2A1 (OH) 3 - A1203 + 3H20

[0006] 商业上,不同类型的煅烧炉设计使用不同类型的燃料(例如油、气、煤)和运行条件例如过量空气。 [0006] Commercially, a different type of calciner designs use different types of fuel (e.g. oil, gas, coal), and operating conditions such as an excess of air. 因此,可产生一定范围的煅烧炉废气温度和组合物;据估计,按重量百分数计,煅烧出来的气体(“煅烧炉废气”)中近35%-50%是水,其它成分包括二氧化碳和挥发性有机碳化合物。 Therefore, a range can produce calciner exhaust gas temperature and composition; estimated, by weight percent, out of the calcination gas ( "calcination furnace gas") in nearly 35% -50% water, carbon dioxide and other volatile components including organic carbon compounds. 此外,煅烧炉废气可含有夹带的氧化铝微粒。 Further, the calcination furnace gas may contain entrained particulate alumina.

[0007] 大量的热量通过煅烧炉废气从拜耳法中损耗。 [0007] large amount of heat loss from the Bayer process by calcination furnace gas. 据估计,当废气中的水蒸气凝结时,所释放的可用热量大多是低位的显热或潜热。 It is estimated that when water vapor condenses in the exhaust gas, the released heat available mostly low latent heat or sensible heat. 但是,后者只能在大气条件下以低于ioo°c、通常是80_83°C的露点回收作为低位热量。 However, the latter only under atmospheric conditions of less than ioo ° c, the dew point is usually recovered 80_83 ° C as the low level heat. 不过,尽管数量可观,但通常认为低位热量在拜耳法的应用有限。 However, despite the impressive number, but it is generally considered low calorie limited application in the Bayer process.

[0008] 上述对本发明背景技术的介绍是为了便于理解本发明。 [0008] The above description of the background of the present invention is intended to facilitate understanding of the present invention. 但是,应当理解,该介绍并非承认和认可所述任何材料为本申请优选权日时在澳大利亚地区的公知常识。 However, it should be understood that this description is not acknowledged and recognized by the present application any material common knowledge in regional Australia when the priority date.

发明内容 SUMMARY

[0009] 概要 [0009] Summary

[0010] 整个说明书中,除非上下文另有需要,措词“都包括”或其变形“包括”或“包括了”将被理解为指代包括所指出的整体或整体集而不排除任何其它整体或整体集。 [0010] Throughout the specification, unless the context requires otherwise, the word "comprise" or variations "comprises" or "comprising" will be understood to refer to the entire set comprising the whole or indicated without the exclusion of any other integer or the whole set.

[0011] 在本说明书的上下文中,术语“脱湿”应理解为包括已经去除了全部或部分水蒸气的气流。 [0011] In the context of this specification, the term "dewetting" has to be understood as including all or part of the gas flow in addition to water vapor.

[0012] 本文选用的其它术语的含义可在本发明的说明书和全文中找到。 [0012] This selection of the meaning of other terms may be found in the description and throughout this invention. 除非另有定义,本文所用的全部其它科学和技术术语都与本发明所属领域熟练技术人员通常所理解的含义相同。 Unless all other scientific and technical terms defined otherwise, as used herein, are skilled in the art to which this invention belongs art the same meaning as commonly understood. [0013] 本领域技术人员将理解,除了本文特别介绍的内容,本发明可以有变化和修改。 [0013] Those skilled in the art will appreciate that, in addition to the contents described herein particularly, the present invention can have modifications and variations. 应当理解,本发明包括所有这些变化和修改。 It should be understood that the invention includes all such variations and modifications. 本发明还包括所有在说明书中单独地或共同地提及或指出的所有步骤、特征、组合物和化合物,以及步骤或特征的任一个和所有的组合或任两个或更多个。 The present invention also includes all of any of the steps or all collectively referred to or indicated in the specification individually, features, compositions and compounds, as well as two steps or features one or more, or any and all combinations.

[0014] 本发明并不局限于本文所述的具体实施方式的范围,它们仅仅是用于举例说明的目的。 [0014] The present invention is not limited to the specific embodiment described herein the scope of the embodiments, they are merely for illustrative purposes. 功能等效的产物、组合物和方法都明确包括在本发明所述的范围内。 Functionally equivalent products, compositions and methods are clearly included within the scope of the present invention.

[0015] 本文所述发明可包括一个或多个数值范围。 [0015] The invention described herein may include one or more range of values. 应理解,数值范围包括了该范围内的所有数值,包括限定范围的边界值,和邻近该范围导致相同或基本相同的结果的数值,这些数值紧邻限定数值范围的边界值。 It should be understood, numerical ranges includes all numbers within that range, including the boundary values ​​defining the range, and values ​​adjacent to the range resulting in the same or substantially the same result, these values ​​close to a boundary value defined numerical range.

[0016] 本文所引用的全部出版物(包括专利、专利申请、期刊文章、实验手册、书籍或其它文献)都再次通过引用作为参考。 [0016] All cited publications (including patents, patent applications, journal articles, laboratory manuals, books or other documents) are again incorporated by reference. 包括并不构成做出了这样的许可,即任何参考都构成了现有技术或本发明相关领域技术人员的公知常识的一部分。 Including such does not constitute a license to make, i.e., any reference constitutes a part of the common general knowledge in the relevant art of the present invention or the prior art.

[0017] 具体内容 [0017] DETAILED SUMMARY

[0018] 根据本发明,提供一种用于浓缩拜耳法废液的方法,该方法包括步骤: [0018] According to the present invention, there is provided a method for concentrated waste Bayer process, the method comprising the steps of:

[0019] 通过将拜耳法煅烧炉废气与水直接接触并加热该水,从拜耳法煅烧炉废气中回收热量; [0019] Bayer process calcined by furnace gas direct contact with water and heating the water, heat is recovered from the calciner off-gas in the Bayer process;

[0020] 将至少一部分回收的热量施用于拜耳法废液;以及 [0020] at least a portion of the recovered waste heat is applied to the Bayer process; and

[0021] 从拜耳法废液中蒸发水分,从而浓缩拜耳法废液。 [0021] The evaporation of water from the waste in the Bayer process, the Bayer process thereby concentrating the waste liquid.

[0022] 如前述背景技术部分所述,尽管大量热量通过煅烧炉废气从拜耳法工艺中损耗,但是这些热量仅能作为低位热量回收,通常认为其在拜耳法中应用有限。 [0022] As described in the foregoing background art, despite the large amount of heat loss from the Bayer process by calcination furnace gas, but these are only as low level heat recovery heat, usually considered limited use in the Bayer process. 但是,已经发现这种热量可用于促进蒸发拜耳法废液中的水分。 However, it has been found that this waste heat can be used to facilitate the water evaporation in the Bayer process. 拜耳法需要精确控制大量成分的浓度和比例,且经常需要去除工艺中的水分以浓缩液体。 Bayer process requires precise control of a large number of component concentrations and ratios, and often need to be removed in the process of water a concentrated liquid.

[0023] 本领域技术人员可以理解,拜耳法废液是已经进行了拜耳法的沉淀阶段但尚未被循环回溶出阶段的液体。 [0023] Those skilled in the art will be appreciated, the waste has been a Bayer process precipitation stage of the Bayer process but has not yet been recycled to the liquid phase of the elution.

[0024] 优选地,将至少一部分回收的热量施用于拜耳法废液的步骤具体包括将拜耳废液接触加热的水,从而将热施用于拜耳废液并冷却该水。 Step [0024] Preferably, at least a portion of the recovered waste heat is applied to the Bayer process comprises contacting the Bayer heated waste water, so that heat is applied to the Bayer liquor was discarded and the cooling water.

[0025] 在本发明优选的实施方式中,该方法包括步骤: [0025] In a preferred embodiment of the invention, the method comprising the steps of:

[0026] 将拜耳法煅烧炉废气与冷却的水接触,从而从拜耳法煅烧炉废气中回收热量,并加热水; [0026] The Bayer process was calcined in contact with water and cooled furnace gas, whereby the exhaust gas from the calciner Bayer process heat recovery and heating the water;

[0027] 通过将更多的拜耳法废液与加热的水接触,将至少一部分回收的热量施用于更多的拜耳法废液,从而将热施用于更多的拜耳法废液并冷却该水;以及 [0027] By contacting the waste liquid with more Bayer heated water, at least a portion of the recovered waste heat is applied to more Bayer process, so that heat is applied to more and cooling the Bayer process waste water ;as well as

[0028] 从该更多的拜耳法废液中蒸发水分,从而浓缩该更多的拜耳法废液。 [0028] The evaporation of water from the Bayer process more waste to waste more concentrated Bayer process.

[0029] 在优选的实施方式中,可重复本发明的步骤以提供循环和/或连续的工艺。 [0029] In a preferred embodiment, the step of the present invention may be repeated to provide a cyclic and / or continuous process.

[0030] 在本发明的优选方式中,水是液体。 [0030] In a preferred embodiment of the present invention, water is a liquid. 在本发明高度优选方式中,液体是水或基本上是水。 In a highly preferred embodiment of the present invention, the liquid is water or substantially water.

[0031] 优选地,煅烧炉废气在气-液接触器内直接与液体接触。 [0031] Preferably, the calcination furnace gas in a gas - liquid in direct contact with the liquid contactor.

[0032] 煅烧炉废气与液体直接接触除了热量回收外还提供其它多种优点。 [0032] The calcining furnace gas into direct contact with the liquid in addition to the heat recovery also provides many other advantages.

[0033] 如上所述,煅烧炉废气可含有挥发性有机碳化合物,而其向大气释放在环境上是高度不期望的。 [0033] As described above, the calcination furnace gas may contain volatile organic carbon compounds, and its release to the atmosphere in the environment is highly desirable. 将这种化合物溶解在水中,则会减少通过煅烧炉废气排放它们。 This compound was dissolved in water, they will reduce emissions by calcination furnace gas. 相当范围的有机碳化合物都溶于水。 Considerable range of organic carbon compounds are dissolved in water. 因此,当水是水时,通过煅烧炉废气排放的有机碳化合物将显著减少。 Thus, when the water is water, it will be significantly reduced by emission of organic carbon compounds calciner.

[0034] 如上所述,煅烧炉废气可含有夹带的氧化铝微粒,而其向大气释放在环境上也是高度不期望的。 [0034] As described above, the calcination furnace gas may contain entrained fine particles of alumina, and its release to the atmosphere in the environment are highly desirable. 煅烧炉废气与水直接接触使得至少一部分氧化铝微粒留在水中,从而减少其排放量。 Calcination furnace gas in direct contact with at least part of the alumina particles such that water remains in the water, thus reducing their emissions.

[0035] 优选地,将煅烧炉废气与水接触从而加热所述水包括步骤: [0035] Preferably, the calcination furnace gas into contact with water thereby heating the water comprising the steps of:

[0036] 将含有水蒸汽的热煅烧炉废气与冷却的水接触,从而将煅烧炉废气冷却到至少一部分水蒸气凝结成液态水的程度,从而生产基本冷却的脱湿煅烧炉废气和温水。 [0036] The water-containing exhaust gas contacts the hot calciner and cooling steam, thereby cooling the exhaust gases to the calciner at least part of the extent of water vapor condenses into liquid water, to produce a substantially cooled dehumidifying heated calciner and the exhaust gas.

[0037] 废气基本脱湿带来另一优点。 [0037] The basic exhaust gas dehumidifying brings another advantage. 水基本上作用于煅烧炉废气烟羽的可见度。 Substantially water acting on the exhaust plume visibility calcination furnace. 而从环境角度将不期望有可见的烟羽。 From an environmental point we will not desired visible plume. 通过本发明的方法的废气脱湿意味着,无论在何种给定温度下,废气烟羽中的可见成分都会减少。 By the method of the present invention is an exhaust gas dehumidifying means, In any given temperature, the exhaust plume of the visible component would be reduced. 此外,本发明的方法允许回收其它损耗在大气中的水分。 Further, the method of the present invention allow the recovery of other losses in moisture in the atmosphere.

[0038] 在本发明的一个方式中,该方法还包括步骤: [0038] In one embodiment of the present invention, the method further comprising the step of:

[0039] 加热冷却的脱湿废气,以提高其浮力来促进分散。 [0039] The heating and cooling dehumidifying the exhaust gas, to increase its buoyancy to facilitate dispersion.

[0040] 优选地,加热冷却的脱湿废气以提高其浮力来促进分散的步骤,包括通过与热源直接或间接接触来加热冷却的脱湿废气。 [0040] Preferably, the step of dehumidifying the exhaust gas to increase its buoyancy to facilitate dispersion of the heating and cooling, including an exhaust gas by direct or indirect contact with a heat source to heat the cooling dehumidification.

[0041] 本领域技术人员将理解,可使用拜耳法管路中的多种热源来加热冷却的脱湿废气。 [0041] Those skilled in the art will understand that various heat sources may be used to line the Bayer process heating and cooling dehumidifying the exhaust gas. 在本发明的一个方式中,热可源自拜耳法煅烧管路中的氧化铝冷却器。 In one embodiment of the present invention, the heat may be derived from the Bayer process calcined alumina cooler line. 在本发明的一个替代方式中,热可源自低压车间蒸汽。 In an alternative embodiment of the present invention, the heat may be steam from a low pressure plant. 在本发明的另一替代方式中,热可源自燃料燃烧器。 In another alternative embodiment of the present invention, the heat from the fuel burner.

[0042] 应当认为可提供一个以上的装置向冷却的脱湿废气施加热。 [0042] It means that more than one may be provided apply heat to the exhaust gas cooling dehumidification. 这些向冷却的脱湿废气施加热的多个装置是串连或平行设置的。 The plurality of means for applying heat to the cooling dehumidifying the exhaust gas is arranged in parallel or in series.

[0043] 在本发明的一个方式中,在将热的煅烧炉废气与冷却的水接触之前,该方法包括步骤: [0043] In one embodiment of the present invention, prior to contacting the hot calciner exhaust gas and cooling water, the method comprising the steps of:

[0044] 使热的煅烧炉废气冷却的脱湿煅烧炉废气接触,从而加热冷却的脱湿煅烧炉废气。 [0044] The hot calciner exhaust gas cooling dehumidification calciner exhaust gas into contact, thereby heating the desiccant calciner cooled exhaust gas.

[0045] 已经发现,在冷却的脱湿废气排放到大气之前将其加热,有助提高废气的浮力并促使废气烟羽适当地分散。 [0045] It has been found, before cooling dehumidification emissions to the atmosphere will be heated, it will help improve the buoyancy of the exhaust gas and causes the exhaust plume suitably dispersed.

[0046] 因此,根据本发明高度优选的实施方式,该方法包括步骤: [0046] Thus, according to a highly preferred embodiment of the invention, the method comprising the steps of:

[0047] 通过将含有水蒸汽的热煅烧炉废气直接接触冷水,从拜耳法煅烧炉废气中回收热量,从而将煅烧炉废气冷却到至少一部分水蒸气凝结成液态水的程度,从而产生冷却的基本脱湿的煅烧炉废气和温水; [0047] By substantially water vapor-containing hot furnace gas fired direct contact with cold water, heat is recovered from the calciner off-gas in the Bayer process, so as to cool the exhaust gas to the calciner at least part of the extent of water vapor condenses into liquid water, thereby producing a cooled dehumidified and heated calciner exhaust gas;

[0048] 通过将温水直接接触拜耳法废液,将至少一部分回收的热量施用于拜耳废液,从而加热拜耳法溶液并冷却所述水; [0048] direct contact with the waste heated by the Bayer process, at least a portion of the recovered waste heat is applied to Bayer, Bayer process liquor thereby heating and cooling the water;

[0049] 从拜耳法废液中蒸发水,从而浓缩拜耳法废液; [0049] The waste water is evaporated from the Bayer process, the Bayer process thereby concentrating the waste;

[0050] 将至少一部分冷却的水再次接触含有水分的热煅烧炉废气;以及 [0050] The water-cooling at least part of the re-exposure to the hot calciner exhaust gas containing water; and

[0051 ] 将冷却的脱湿煅烧炉废气与热源接触,从而加热所述冷却的脱湿煅烧炉废气。 [0051] The cooled dehumidifying heat source in contact with calciner exhaust gas, thereby heating the desiccant cooling of the calciner exhaust gas.

[0052] 优选地,通过将煅烧炉废气与水接触从拜耳法煅烧炉废气中回收热量从而加热所述水的步骤包括: [0052] Preferably, the calcination furnace gas by contact with water to recover heat from the calciner off-gas to heat the Bayer process water comprising the step of:

[0053] 在大气压或接近大气压下使煅烧炉废气接触水的步骤。 [0053] The step of contacting the calcined furnace gas in water at or near atmospheric pressure. [0054] 在本发明的上下文中,术语“接近大气压”应理解指为使得容器不需要验证为压力容器的压力。 [0054] In the present context, the term "near atmospheric pressure" is understood to mean that the container is not authenticated as a pressure vessel pressure.

[0055] 在优选的实施方式中,重复该方法的步骤以提供连续的工艺。 [0055] In a preferred embodiment, the steps of the method is repeated to provide a continuous process.

[0056] 将煅烧炉废气直接接触水的步骤可由本领域技术人员已知的任一种气-液接触器装置来实现。 To achieve liquid contactor apparatus - [0056] The calcining furnace gas by direct contact with water known to the skilled person either gas. 例如盘式塔、结构填料塔、随机填料塔、流化填料塔、喷雾塔和阶塔式气-液接触器都适合用于本发明的方法。 For example a tray column, a packed column configuration, randomly packed tower, fluidized packed tower, spray tower and tower order gas - liquid contactor are suitable for use in the present invention. 用于实现本发明所述方法的理想气-液接触器装置包括用于提高气-液接触的传热率和传质率的装置。 Liquid contactor comprises means for increasing the gas - - liquid contacting apparatus of heat transfer rate and the mass transfer rate over the air to achieve the present invention method. 所述装置可包括固定填料式、流化填料式,并使用托盘和挡板。 The filler means may include a fixed type, packing type fluidized, using trays and baffles. 一些合适的填料,例如聚丙烯填料,可能是热敏性的,因此在将其引入含有这种填料的任何装置之前,可能必须降低热煅烧炉废气的温度。 Some suitable fillers, fillers such as polypropylene, may be heat sensitive, therefore incorporated before any apparatus containing such a filler, it may be necessary to reduce the temperature of the hot calciner exhaust gases.

[0057] 实现本发明所述方法的便利途径是,在将热煅烧炉废气引入任何接触容器之前,将热煅烧炉废气直接接触一部分水。 [0057] facile way of implementing the method according to the present invention, prior to introducing the hot calciner exhaust gases of any contact with the container, the hot calciner exhaust gases in direct contact with a portion of water. 在发明的优选方式中,热煅烧炉废气在进入任何接触容器之前直接接触一部分热水。 In a preferred embodiment of the invention, the hot calciner exhaust gases before entering any vessel in direct contact with the contact portion of the hot water.

[0058] 优选地,将拜耳法废液接触热水从而将热施用于拜耳法溶液的步骤具体包括将拜耳法废液间接接触热水,从而向拜耳法溶液施加热。 [0058] Preferably, the waste water in contact with Bayer process step whereby heat is applied to the solution of the Bayer process comprises contacting the waste water indirect Bayer process, so as to apply heat to the Bayer process liquor.

[0059] 允许拜耳法废液通过间接接触热水而被加热的装置是本领域技术人员已知的,且包括垂直管降膜、水平管降膜、垂直升膜、釜式锅炉或加压式煅烧装置。 [0059] The apparatus allows the Bayer process effluent is heated by indirect contact with hot water are known to the skilled person, and includes a vertical falling film tube, a horizontal tube falling film, rising film perpendicularly, pressurized tank or boiler calcining apparatus. 在本发明的一个方式中,将拜耳法废液间接接触热水从而加热拜耳法废液的步骤使用具有壳侧(shell-side)和管侧(tube-side)的降膜蒸发器,该方法包括步骤: In one embodiment of the present invention, the waste water in indirect contact with Bayer process step to heat waste Bayer process having a shell side (shell-side) and a side pipe (tube-side) of a falling film evaporator, the method comprising the steps of:

[0060] 将热水引入降膜蒸发器的壳侧; [0060] The water introduced into the shell side of the falling film evaporator;

[0061] 将拜耳废液引入降膜蒸发器的管侧; [0061] The waste liquid introduction pipe side Bayer falling film evaporator;

[0062] 从而加热拜耳法废液,并冷却所述水。 [0062] The Bayer process thereby heating the waste, and cooling the water.

[0063] 应当理解,可以提供一种以上的装置对拜耳法废液进行加热。 [0063] It should be understood that more than one means may be provided for heating the waste Bayer process. 对拜耳法废液进行加热的多个装置可设置成串连或平行。 A plurality of means for heating the Bayer process waste may be arranged in series or parallel.

[0064] 在本发明的一个方式中,该方法还包括步骤: [0064] In one embodiment of the present invention, the method further comprising the step of:

[0065] 进一步加热所述热水。 [0065] The hot water is further heated.

[0066] 可利用获自拜耳法管路内的热源或者获自例如发电站或其它工业设备的外部热源对热水进一步加热。 [0066] available from the heat source can be used, or obtained from an external heat source in the Bayer process line such as power stations or other industrial equipment further heated hot water. 本领域技术人员能理解,可利用拜耳法管路中的多种热源。 Those skilled in the art will appreciate, a variety of heat sources may be utilized in the Bayer process line. 在本发明的一个方式中,热可源自拜耳法煅烧管路中的氧化铝冷却器。 In one embodiment of the present invention, the heat may be derived from the Bayer process calcined alumina cooler line. 在本发明的替代方式中,热可源自低压车间蒸汽。 In an alternative embodiment of the present invention, the heat may be steam from a low pressure plant.

[0067] 在本发明的一个方式中,该方法还包括步骤: [0067] In one embodiment of the present invention, the method further comprising the step of:

[0068] 在从拜耳法煅烧炉废气中回收热量之前,增加煅烧炉废气中的水蒸汽含量。 [0068] Before recovering heat from the calciner exhaust gas Bayer process, increasing the water vapor content of the calciner exhaust gas.

[0069] 优选地,在从拜耳法煅烧炉废气中回收热量之前增加煅烧炉废气中的水蒸汽含量的步骤包括: [0069] Preferably, the water vapor content increases calciner exhaust gas before the exhaust gas heat is recovered from the calciner Bayer process comprising the step of:

[0070] 将至少一部分煅烧炉废气输送到分离器,以提供脱湿气流和富含蒸汽的气流。 [0070] at least a portion of the exhaust gas supplied to the calciner separator to provide a gas stream and a rich stream dewetting steam.

附图说明 BRIEF DESCRIPTION

[0071] 下面将结合附图和具体实施方式介绍本发明,其中: [0071] The following embodiments in conjunction with the accompanying drawings and detailed description of the present invention, wherein:

[0072] 图1是示出根据本发明的方法的流程示意图; [0072] FIG. 1 is a diagram showing flow of the method according to the present invention;

[0073] 图2是示出根据本发明第一实施方式的方法的流程示意图;[0074] 图3是示出根据本发明第二实施方式的方法的流程示意图; [0073] FIG. 2 is a flow diagram illustrating a method according to a first embodiment of the present invention; [0074] FIG. 3 is a flow diagram illustrating a method according to a second embodiment of the present invention;

[0075] 图4是示出根据本发明第三实施方式的方法的流程示意图; [0075] FIG. 4 is a flow diagram illustrating a method according to the third embodiment of the present invention;

[0076] 图5是示出根据本发明第四实施方式的方法的流程示意图; [0076] FIG. 5 is a flow diagram illustrating a method according to a fourth embodiment of the present invention;

[0077] 图6是示出根据本发明第五实施方式的方法的流程示意图;以及 [0077] FIG. 6 is a schematic flow diagram of a method according to a fifth embodiment of the present invention is shown; and

[0078] 图7是示出根据本发明第六实施方式的方法的流程示意图。 [0078] FIG. 7 is a schematic flow diagram illustrating a method according to a sixth embodiment of the present invention.

具体实施例 Specific Example

[0079] 本领域技术人员应当理解,本文所述本发明的内容可以变化和修改,而不局限于所介绍的特定内容。 [0079] skilled in the art will appreciate that the present invention described herein may be varied and modified, but not limited to the specific content presented. 应当理解,本发明包括所有这种变化和修改。 It should be understood that the invention includes all such variations and modifications. 本发明还包括所有在说明书中单独地或共同地提及或指出的所有步骤、特征、组合物和化合物,以及步骤或特征的任一个和所有的组合或任两个或更多个。 The present invention also includes all of any of the steps or all collectively referred to or indicated in the specification individually, features, compositions and compounds, as well as two steps or features one or more, or any and all combinations.

[0080] 在图1中,提供示出如何使用根据本发明方法的常规流程图。 [0080] In Figure 1, there is provided a flow diagram illustrating how a conventional method according to the present invention.

[0081] 根据本发明,将湿的煅烧炉废气12供料给气-液接触器14,其在那里直接接触冷却水流16。 [0081] According to the present invention, the wet calcination furnace gas 12 fed to the gas - liquid contactor 14, which is in direct contact with cooling water 16 therein. 将从温湿废气12中回收的潜热传递给冷却水流16,从而将冷却水流16加热,温湿废气12的至少一部分水蒸气凝结成液态水,因而产生冷却的基本脱湿的废气18和温的水流20。 12, the latent heat recovered from the exhaust gas temperature and humidity to pass cooling water 16, so that the cooling water 16 is heated, the exhaust gas temperature and humidity at least a portion of the water vapor condenses into liquid 12, thereby producing cooled flue gas 18 substantially dehumidified and temperature water 20.

[0082] 气-液接触器14被用于增加气-液接触的传热率和传质率,并利用冷却水流16和温湿煅烧炉废气12工作。 [0082] The gas - liquid contactor 14 is used to increase the gas - liquid contact and mass transfer rate of the heat transfer rate, and by the cooling water temperature and humidity calcination furnace gas 16 and 12 work. 由于增加气-液接触的传热率和传质率的装置22可能是热敏性的,它可能必须在将温湿煅烧炉废气12供料给气-液接触器14之前将其冷却。 Since the increase in the gas - liquid contact and the heat transfer rate of mass transfer devices 22 may be heat sensitive, it may be necessary when the calcination temperature and humidity furnace gas 12 fed to the gas - liquid contactor 14 before it is cooled.

[0083] 大部分的温水流20从气-液接触器14排出,并经由水泵26传给降膜蒸发器24。 [0083] Most of the warm water 20 from the gas - liquid contactor 14 is discharged, and passed through the falling film evaporator 24 pump 26.

[0084] 提供包括壳体部分(未示出)和管道部分(未示出)的降膜蒸发器24来浓缩拜耳法废液28。 [0084] providing a housing portion (not shown) and a duct portion (not shown) of a falling film evaporator concentrate waste from the Bayer process 24 to 28. 进入降膜蒸发器24壳体部分的温水流20作为热源用于间接加热,因此从作为液体膜经管道部分进入拜耳法废液28的水蒸气中蒸发水。 Into the warm water falling film evaporator 24 of the housing portion 20 as a heat source for the indirect heating, and therefore into the waste water is evaporated from Bayer vapor as a liquid film 28 via the conduit section. 浓缩的拜耳法废液30从降膜蒸发器28中排出。 Concentrated Bayer process waste 30 discharged from the falling film evaporator 28. 在离开降膜蒸发器24之后,温水流20再次循环用作冷却水循环流32。 After leaving the falling film evaporator 24, circulating warm water 20 again as the cooling water circulation 32.

[0085] 在离开降膜蒸发器24之后,部分循环冷却水流32循环回冷却水流16,而剩余的循环冷却水流32部分34被收集。 [0085] After exiting the falling film evaporator 24, part of the circulating cooling water 32 recycled to the cooling water flow 16, while the remaining portion 32 of the circulating cooling water 34 is collected.

[0086] 加热所供料的拜耳法废液28,并将产生的蒸汽36输送到冷凝器38。 Waste Bayer [0086] heating the feed 28, the generated steam 36 to the condenser 38 is conveyed.

[0087] 一部分浓缩拜耳法废液30回到液体管路40,而浓缩拜耳法废液30的第二部分42循环回去,并在进入降膜蒸发器24之前与拜耳法废液28混合。 [0087] Bayer portion of the concentrated waste liquid 30 back to line 40, and the circulation-concentrated second portion 42 of the back 30 Bayer process waste, and waste liquid 28 into the mixing Bayer 24 before falling film evaporator.

[0088] 认为除了向必要的供应商提供各种参数例如流速、流体类型和温度以外,可通过熟练技工来完成用于构建实施本发明所用的工厂所需的多种装置的安装,而仅需少量投资。 [0088] In addition to providing the various parameters considered necessary to suppliers such as flow rate, fluid type and temperature, it can be accomplished by the skilled artisan mounting embodiment for constructing various devices required for the plant used in the present invention, the only a small investment. 为了构件实施本发明所必须的组件,需要由合适的设备生产商提供特定的工艺数据。 To member assembly embodiment of the present invention must be a need to provide specific process data by a suitable equipment manufacturers. 申请人之一在澳大利亚西部炼油厂的煅烧炉内燃烧天然气的工艺数据的一个实例提供如下。 One example of one of the applicants of the combustion gas in the process data calciner West Australian refinery provided below.

[0089]废气流约是:氮 110t/hr、氧6t/hr、二氧化碳20t/hr、水90t/hr,总计226t/hr。 [0089] The exhaust gas flow is about: nitrogen 110t / hr, oxygen 6t / hr, carbon dioxide 20t / hr, water 90t / hr, a total of 226t / hr.

[0090] 在大气压下,温度165°C,露点83°C。 [0090] Under atmospheric pressure, a temperature of 165 ° C, dew point 83 ° C.

[0091] 用水淬火所述废气,以便在气体进入塔之前将其冷却至其露点。 [0091] quenching the exhaust gas with water, before the gas enters the tower to be cooled to its dew point.

[0092] 进入塔的水: [0092] Water entering the column:

[0093] 62 °C,流速约2200kL/hr。 [0093] 62 ° C, flow rate of about 2200kL / hr.

[0094] 塔的所需性能:[0095] 排出废气露点64°C,排出水温度81°C。 [0094] The properties required column: [0095] discharging the exhaust gas dew point 64 ° C, the discharge water temperature is 81 ° C.

[0096] 蒸发器的设计需要待处理的拜耳法废液的物性的信息,包括溶液组成、密度、粘度、热容、导热性、蒸汽压力。 Information waste Bayer [0096] evaporator designs require physical properties to be treated, including solution composition, density, viscosity, thermal capacity, thermal conductivity, vapor pressure.

[0097] 认为上述信息足以使厂商设计出合适的塔,例如填料塔(澳大利亚RhineRhur Pty有限公司,塔直径、填料类型、填料高度和压降)、盘式塔(澳大利亚LisbonEngineering Pty有限公司,塔直径、盘数量、盘的设计、塔高度和压降)、和流化润轮塔(英国Fluid Technologies有限公司,塔直径、涡轮类型、静态和流化填料高度和压降)。 [0097] that the above information is sufficient to manufacturers to design a suitable column, e.g., a tray tower (LisbonEngineering Pty Ltd, Australia, column diameter packed column (RhineRhur Pty Ltd, Australia, column diameter, type of filler, filler height and pressure drop) , the number of discs, disc design, the column height and pressure drop), and fluidizing Run wheel column (Fluid Technologies UK Ltd, column diameter, turbine type, static and fluidizing packing height and pressure drop).

[0098] 任何本领域技术人员都可通过设计手册或技术文献,或任何蒸发装置厂商(法国的GEA Kestner、瑞士温特图尔市的Bertrams Salt Plants)提供的任何标准的热交换器设计所述传热装置(降膜蒸发器和蒸汽冷却器)。 The heat exchanger design [0098] anyone skilled in the art can be manual or by designing the technical literature, any standard evaporation or any device manufacturer (France GEA Kestner, Winterthur, Switzerland Bertrams Salt Plants) provided the transfer means (falling film evaporator and steam coolers).

[0099] 通过结合基于化学工程基本原理和存在于拜耳装置操作中的内部模型、拜耳法性能的昂贵数据库和热力学数据、拜耳法工作经验和基于ASPEN Plus™、ASPEN技术公司软件过程模拟和现有技术中物理性能预装元件的软件流程图模型,包括拜耳法的性能和基于其自身的装置操作,可设计、评价和改进本发明的实施方式。 [0099] By combining the basic principles of chemical engineering and are present in the internal model of the operation of the device based on the Bayer expensive databases and thermodynamic performance data Bayer process, the Bayer process and experience ASPEN Plus ™, ASPEN process simulation software based on Technology and prior the physical properties of preinstalled software art flowchart model elements, including performance and operation of the device based on its own Bayer process, may be designed, evaluated and modified embodiment of the present invention.

[0100] 应当理解,下述与流速和温度有关的数值是所使用的模型和实施方式所特有的,并且受输入模型的参数的影响。 [0100] It should be understood that the following values ​​related to the model and the flow rate and temperature are used in the embodiment of the unique, and is influenced by the model input parameters. 例如,废气组成和温度将影响下游的温度和流速。 For example, the exhaust gas composition and temperature will affect the temperature and flow rate downstream.

[0101] 应当理解,使用本发明方法的位置,特别是通向合适的散热器(例如为冷却工艺提供水)的位置,可以影响该方法的许多步骤。 [0101] It should be appreciated that, using the method of the present invention position, in particular leading to a suitable heat sink (e.g., water used in the cooling process) location, can influence a number of steps of the method.

[0102] 在图2中,示出根据本发明第一实方式来浓缩拜耳法废液的方法。 [0102] In FIG. 2, illustrating a method according to a first embodiment of the present invention, the solid waste is concentrated Bayer process. 图1和图2的方法基本相似,且相同的附图标记代表相同的步骤和特征。 Represent the same steps and features substantially similar to FIG. 1 and FIG. 2 method, and the same reference numerals. 可以想到,该实施方式将用于提供有合适的散热器例如大型冷却水供应的地方。 It is contemplated, this embodiment provides for a suitable place such as a large heat sink of the cooling water supply.

[0103] 在本实施方式中,煅烧炉废气12通过直接接触通常约50_150kL/hr的水喷雾50而淬火,以便在喂入气-液接触器14之前冷却温湿的煅烧炉废气12。 [0103] In the present embodiment, the calcination furnace gas is generally from about 12 50_150kL / hr of water spray quench 50 by direct contact, so that the feed gas - cooling and humidity 12 before firing furnace gas liquid contactor 14.

[0104] 通过气体加热器52加热从气-液接触器14排出的冷却脱湿废气18,以提升其浮力。 [0104] heated by the gas from the gas heater 52 - 18 dehumidifying the exhaust gas discharged from the cooling liquid contactor 14 to improve its buoyancy. 气体加热器52可通过例如直接燃烧废气流18中的少量天然气和空气,或通过用水流、热气或热水热交换器来间接加热(需要约lOGJ/hr的热量)来工作。 Gas heater 52 may be operated by a small amount, for example, direct combustion of natural gas and air exhaust stream 18, or by treatment with water, hot air or hot water indirectly heated heat exchanger (heat requires about lOGJ / hr.).

[0105] 从气-液接触器14排出的温水流约83°C,并被泵入降膜蒸发器24,在那里拜耳法废液供料28产生的水蒸气36约70t/hr,以及在水冷式冷凝器54内收集。 [0105] From the gas - liquid contactor 14 discharged from the warm water of about 83 ° C, and pumped into the falling film evaporator 24, where the waste feed Bayer process steam 28 produced about 36 70t / hr, and in 54 collected within a water-cooled condenser.

[0106] 在图3中,示出根据本发明第二实施方式来浓缩拜耳法废液的方法。 [0106] In FIG. 3, a method according to a second embodiment of the present invention is concentrated waste Bayer process. 图1、2和3的方法基本相似,相同的附图标记代表相同的步骤和特征。 Method 1, 2 and 3 are substantially similar, the same reference numerals denote the same steps and features.

[0107] 本实施方式被设计用于在需要增加废气的水回收或不能获得用于工艺冷却的足够的水供应的地点来实施。 [0107] The present embodiment is designed to place a water recovery, or insufficient water supply for the cooling process of exhaust gas needs to be increased to implement. 该实施方式还介绍了使用氧化铝来冷却来自煅烧炉的热量的实例。 This embodiment also describes an example of using heat from the cooling alumina calciner.

[0108] 在该实施例中,从气-液接触器14排出的温水流20在传递到两个降膜蒸发器24的第一个62之前,由来自煅烧炉的废热60加热到约84°C。 [0108] In this embodiment, the gas - liquid contactor 14 is discharged from the warm water 20 before the first 6224 is transmitted to the two falling film evaporator is heated by waste heat from the calciner to about 84 ° 60 C. 在煅烧炉内冷却氧化铝的过程中获得废热60。 60 waste heat obtained during the cooling alumina calciner. 应当理解,可从拜耳管路的其它来源64或别处获得所述热量。 It should be understood that other sources available from Bayer conduit 64 or the heat obtained elsewhere.

[0109] 提供两个串连工作的降膜蒸发器62,66,第一阶段62比第二阶段66的工作温度约高10°C。 [0109] Providing two series-connected falling-film evaporators work 62, 66, 62 than the temperature of the first phase of the second stage 66 about the high 10 ° C. 第一阶段62的冷凝闪蒸蒸汽68以合适的温度(通常高于约60°C),用翅扇式空气冷却器70间接冷凝,减少用于工艺冷却的水消耗,因此提高水的净回收量。 The first stage flash vapor condensed 6862 in a suitable temperature (typically greater than about 60 ° C), with 70 fin-fan air condensing indirect cooler, reducing the consumption of water for cooling the process, thus increasing the net recovery of water the amount. 第二降膜蒸发器66的冷凝闪蒸蒸汽72在水冷式冷凝器74内冷凝(通常低于60°C )。 The second falling film evaporator 66 of the flash steam condensate 72 condensed in water cooled condenser 74 (typically below 60 ° C).

[0110] 进入第一降膜蒸发器62壳体部分的热水流61作为热源间接加热并从而蒸发作为液体膜通过管道部分进入的拜耳法废液28的水分。 [0110] into the first falling film evaporator 62 of the housing portion 61 as a heat source hot water indirectly heated to evaporate the water and waste as a liquid membrane into the Bayer process by the conduit portion 28. 浓缩的拜耳法废液76离开第一降膜蒸发器62,并进入第二降膜蒸发器66的管道部分。 Bayer concentrated waste 76 away from the first falling film evaporator 62, enters the conduit portion 66 and a second falling film evaporator.

[0111] 热水流61在离开第一降膜蒸发器62之后,进入第二降膜蒸发器66的壳体部分78,并作为热源间接加热和蒸发浓缩拜耳法废液76的水分。 [0111] 61 after the hot water exits the first falling film evaporator 62, the housing 66 into the second falling film evaporator 78, and as an indirect heating source water and concentrated by evaporation of the waste liquid 76 Bayer process.

[0112] 浓缩的拜耳法废液80离开第二降膜蒸发器66。 [0112] The concentrated Bayer process waste 80 away from the second falling film evaporator 66.

[0113] 一部分再循环冷却水流82在离开第二降膜蒸发器66之后,循环回冷却水流16,同时再循环冷却水流82的剩余部分34被收集。 [0113] 82 portion of the recirculating cooling water after exiting the second falling film evaporator 66, the cooling water flow 16 is recycled back, recirculating cooling water stream 82 while the remaining portion 34 is collected.

[0114] 在图4中,示出根据本发明第三实施方式来浓缩拜耳法废液的方法。 [0114] In Figure 4, illustrates a method according to a third embodiment of the present invention is concentrated waste Bayer process. 图1、2、3和4的方法基本相似,相同的附图标记代表相同的步骤和特征。 The method of FIGS. 2, 3 and 4 are substantially similar, the same reference numerals denote the same steps and features.

[0115] 该实施方式被设计用于在需要增加蒸发量和进一步减少蒸发所需的车间蒸汽的地方实施。 [0115] This embodiment is designed for carrying out the need to increase the evaporation and further reduce the evaporation plant required to place the steam. 该实施方式还介绍了使用氧化铝来冷却来自煅烧炉的热量的实例。 This embodiment also describes an example of using heat from the cooling alumina calciner.

[0116] 第三实施方式与第二实施方式不同之处在于用机械式蒸汽再压缩器90代替翅扇式空气冷却器70,以提高进入第二降膜蒸发器66的热量。 [0116] The third embodiment differs from the second embodiment in that a mechanical vapor recompression unit 90 instead of the fin-fan air cooler 70, in order to improve the heat into the second falling film evaporator 66.

[0117] 在图5中,示出根据本发明第四实施方式来浓缩拜耳法废液的方法。 [0117] In FIG. 5, there is shown a method according to a fourth embodiment of the present invention is concentrated waste Bayer process. 图1、2、3、4和5的方法基本相似,相同的附图标记代表相同的步骤和特征。 The method of FIGS. 3, 4 and 5 is substantially similar, identical reference numerals denote the same steps and features.

[0118] 在该实施方式中,废气12的一部分100流经气体分离器102,至少剥离一部分水蒸汽,并提供水蒸气的渗透流104和脱水气的渗余流106。 [0118] In this embodiment, the portion of the exhaust gas flowing through the gas separator 12 100 102, the release of at least a portion of the water vapor, and to provide a permeate dehydrated gas stream 104 and vapor stream 106 in the retentate. 渗透流104与旁通气体分离器102的气流部分107组合,以提供气流具有水蒸气增多的气流108,从而提高了露点。 Permeate stream 104 and a bypass airflow portion 102 of the gas separator 107 are combined to provide a gas stream having a water vapor stream 108 is increased, thereby increasing the dew point. 提高了离开气-液接触器104的水流20的温度。 The gas leaving the improved - the temperature of the flow 104 of liquid contactor 20.

[0119] 本领域技术人员可以理解,此处所述的实施方式,除了特别说明以外,可以有变化和修改。 [0119] Those skilled in the art will appreciate, the embodiment described herein, unless specifically than described, variations and modifications are possible.

[0120] 在该实施方式的一个实例中,165°C下,热湿的煅烧炉废气100以141t/hr的流速进入隔膜气体分离器102,包括例如杜邦Nafion分离器,产生54.5t/hr的水蒸气渗透流104,和86.5t/hr及160°C的脱水气的渗余流106。 [0120] In one example of this embodiment, at 165 ° C, heat moisture calcination furnace gas 100 at a flow rate of 141t / hr into the membrane gas separator 102, the separator comprising a DuPont Nafion e.g., generating 54.5t / hr of water vapor permeate stream 104, and 86.5t / hr and dehydrated retentate gas stream 106 to 160 ° C. 水蒸气的渗透流104结合热湿煅烧炉废气流107以约61t/hr的流速提供气流108,其中水蒸气含量约69%。 The vapor permeate stream 104 combined heat and moisture calciner exhaust stream 107 flow rate of about 61t / hr air stream 108 is provided, wherein the water vapor content of about 69%. 在约106kPa下加料气-液接触器14之前,组合气流108通过直接接触通常约50Kl/hr的喷雾50而淬火。 The feed gas at about 106kPa - before liquid contactor 14, the combined gas stream 10 850 and direct contact quenching by spraying typically about 50Kl / hr of. 温水流20在约88°C下离开气-液接触器14,并进入降膜蒸发器24,在约2303t/hr的废液供料28中产生约77t/hr的蒸发气流36。 Warm water 20 leaving about 88 ° C at the gas - liquid contactor 14 and into the falling film evaporator 24, the effluent from about 2303t / hr feed stream 28 and is evaporated to about 77t / hr to 36.

[0121] 离开气-液接触器的冷却脱湿废气18结合脱水气的渗余流106产生129t/hr的废气排气113,其露点约50°C,温度约129°C,足以能够分散。 [0121] leaves the gas - liquid contactor 18 of the exhaust gas cooling dehumidifying binding dehydrated retentate gas stream 106 to produce 129t / hr, the exhaust gas exhaust 113, a dew point of about 50 ° C, a temperature of about 129 ° C, can be dispersed enough.

[0122] 在图6中,示出根据本发明第五实施方式来浓缩拜耳法废液的方法。 [0122] In FIG. 6, illustrating a method according to a fifth embodiment of the present invention is concentrated waste Bayer process. 图1、2、3、4、5和6的方法基本相似,相同的附图标记代表相同的步骤和特征。 The method of FIG. 1,2,3,4,5 and 6 are substantially similar, the same reference numerals denote the same steps and features.

[0123] 第五实施方式与第四实施方式不同之处在于经过降膜蒸发器34之前,用煅烧炉的废热60加热从气-液接触器14排出的温水流20。 [0123] The fifth embodiment differs from the fourth embodiment in that prior to falling film evaporator 34 through the heating air with waste heat from the calciner 60 - warm water discharged from the liquid contactor 1420.

[0124] 该实施方式的一个实例是,使用氧化铝冷却器60的热量将离开气-液接触器14的温水流20的温度提高至90.5°C,进入降膜蒸发器24的温水流61产生多于80t/hr的蒸发气流36。 [0124] An example of this embodiment is that the heat of the alumina leaves the gas cooler 60 - the temperature of liquid contactor 14 of the warm water is increased to 20 90.5 ° C, into the falling film evaporator 61 to generate warm water 24 evaporated stream than 80t / hr to 36. [0125] 在图7中,示出根据本发明第六实施方式来浓缩拜耳法废液的方法。 [0125] In FIG. 7, a method according to a sixth embodiment of the present invention is concentrated waste Bayer process. 图1、2、3、4、 Figure 3, 4,

5、6和7的方法基本相似,相同的附图标记代表相同的步骤和特征。 5, 6 and 7 methods are similar, identical reference numerals denote the same steps and features.

[0126] 通常约165°C且大气压下流速约202t/hr的热湿煅烧炉废气12进入气-气热交换器110,在那里它间接接触冷却的脱湿废气18。 [0126] typically about 165 ° C and atmospheric pressure at a flow rate of about 202t / hr of heat and moisture into the calciner exhaust gas 12 - gas heat exchanger 110, where it is in indirect contact with the cooled flue gas 18 dewetting. 可以想到,在约64°C,将流速约为139t/hr的冷却脱湿废气加料气-气热交换器110。 It is contemplated that, at about 64 ° C, the flow rate of about 139t / hr of the cooled feed gas dehumidifying the exhaust gas - air heat exchanger 110.

[0127] 在气-气热交换器110内,从热湿煅烧炉废气12中回收一部分显热,从而将热湿煅烧炉废气12冷却,约125 °C形成温湿煅烧炉废气112流。 [0127] In the gas - the gas heat exchanger 110, heat moisture calcination furnace gas 12 recovered from a portion of sensible heat, so that the hot wet calcination furnace gas 12 is cooled from about 125 ° C and humidity is formed calciner exhaust stream 112.

[0128] 冷却的脱湿废气18在从热湿煅烧炉废气12获取显热后,加热至约135°C,然后作为热湿煅烧炉废气114流以139t/hr释放到大气。 [0128] The cooled flue gas 18 in the dehumidifying acquired sensible heat from the hot flue gas 12 after the wet calcination furnace, heated to about 135 ° C, and then wet calcination furnace gas as a heat stream 114 to 139t / hr is released to the atmosphere.

[0129] 将热湿煅烧炉废气12与冷却脱湿的废气18接触,从而将冷却脱湿的废气18加热,基本上提高了其浮力,当废气烟羽释放到大气时能够适当分散它。 [0129] 12 contacting the heat and moisture calciner exhaust gas cooling and dehumidifying 18, thereby cooling the dehumidified exhaust gas 18 is heated, substantially increasing its buoyancy, when the exhaust gas plume released to the atmosphere it can be properly dispersed.

[0130] 以202t/hr的流速离开气-气热交换器110后的温湿煅烧炉废气112,在加料给气-液接触器14之前,通过直接接触通常约100kL/hr的喷雾50而淬火,在接触器14处它以约1800t/hr的加料速度和约62°C的温度直接接触冷却水流16。 [0130] The flow rate of 202t / hr of gas leaving - the temperature and humidity of the calciner exhaust gas-gas heat exchanger 110 112, in addition to the gas - liquid contactor 14 before, typically about by direct contact 100kL / hr while quenching spray 50 direct contact of the contact at a temperature of about 14 it 1800t / hr feed rate of from about 62 ° C cooling water 16. 从温湿煅烧炉废气112回收的潜热传递给冷却水流16,从而加热冷却水流16至使至少一部分温湿煅烧炉废气112的水蒸气凝结呈液态水的程度,从而产生冷却的脱湿废气18和温水流20。 The latent heat is transferred from the calcination temperature and humidity furnace gas 112 to the cooling water 16 recovered, thereby heating the cooling water flow 16 to cause at least part of the calciner temperature and humidity of the exhaust gas was 112 degree condensation of water vapor to liquid water to produce a cooled flue gas 18 and dewetting warm water 20.

[0131] 大量温水流20以约1864t/hr的流速离开气-液接触器14,并通过水泵26进入降膜蒸发器24。 [0131] plenty of warm water at a flow rate of about 20 1864t / hr exiting gas - liquid contactor 14 and into the falling film evaporator 24 by pump 26.

[0132] 温水流20进入降膜蒸发器24的壳体部分,流速约1864t/hr,并且浓缩的拜耳法废液30从降膜蒸发器24中排出。 [0132] 20 into the warm water falling film evaporator housing portion 24, a flow rate of about 1864t / hr, and concentrated Bayer process waste liquid 30 discharged from the falling film evaporator 24. 在离开降膜蒸发器24之后,温水流再次循环用作冷却水循环流32。 After leaving the falling film evaporator 24, re-circulating warm water 32 is used as cooling water circulation.

Claims (23)

  1. 1.一种浓缩拜耳法废液的方法,该方法包括步骤: 通过将拜耳法煅烧炉废气与水直接接触并加热该水,从拜耳法煅烧炉废气中回收热量; 将至少一部分回收的热量施用于拜耳法废液;以及从拜耳法废液中蒸发水分,从而浓缩拜耳法废液。 A method for concentrated waste Bayer process, the method comprising the steps of: calcining Bayer process by the furnace gas in direct contact with water and heating the water, heat is recovered from the calciner off-gas in the Bayer process; least a portion of the recovered heat application in the Bayer process waste; evaporating water from the waste and waste Bayer process, thereby concentrating the Bayer process.
  2. 2.根据权利要求1所述的浓缩拜耳法废液的方法,其中,将至少一部分回收的热量施用于拜耳法废液的步骤包括将拜耳法废液与经加热的水接触,从而加热拜耳法废液并冷却该水。 2. The method of concentrated waste Bayer process according to claim 1, wherein at least a portion of the recovered waste heat is applied to the step of the Bayer process comprises contacting the waste water with the heated Bayer process, the Bayer process to heat and cooling the waste water.
  3. 3.根据权利要求2所述的浓缩拜耳法废液的方法,其中该方法包括步骤: 将拜耳法煅烧炉废气与冷却的水接触,从而从拜耳法煅烧炉废气中回收热量,并加热水; 通过将更多的拜耳法废液与经加热的水接触,将至少一部分回收的热量施用于该更多的拜耳法废液,从而加热该更多的拜耳法废液并冷却所述水;以及从该更多的拜耳法废液中蒸发水分,从而浓缩该更多的拜耳法废液。 The waste solution was concentrated Bayer process according to claim 2, wherein the method comprises the steps of: contacting the Bayer process water and cooling the calcination furnace gas, whereby the exhaust gas from the calciner Bayer process heat recovery and heating the water; more by contacting the waste water with the heated Bayer process, at least a portion of the recovered heat is applied to the waste liquid more Bayer process, thereby heating the more waste water and cooling said Bayer process; and evaporation of moisture from the Bayer process more waste to waste more concentrated Bayer process.
  4. 4.根据上述权利要求1所述的浓缩拜耳法废液的方法,其中,煅烧炉废气在对流式气-液接触器内与水直接接触。 4. The method of claim 1 effluent was concentrated Bayer preceding claims, wherein the calcining furnace gas in a convection air - into direct contact with water in the liquid contactor.
  5. 5.根据上述权利要求1所述的浓缩拜耳法废液的方法,其中将煅烧炉废气与水接触从而加热水的步骤包括步骤:· 将含有水蒸气的热煅烧炉废气与冷却的水接触,从而将煅烧炉废气冷却到至少一部分水蒸气凝结成液态水的程度,从而产生冷却的脱湿煅烧炉废气和温水。 5. The method of claim 1 effluent was concentrated Bayer process according to claim 1, wherein the calcining step is contacted with water so that the exhaust gas of the furnace for heating water comprising the steps of: contacting the water-containing exhaust gas and cooling the hot calciner water vapor, the calciner exhaust gas is cooled so that at least a portion of the extent of water vapor condenses into liquid water, thereby producing dehumidifying heated calciner and the exhaust gas cooling.
  6. 6.根据权利要求5所述的浓缩拜耳法废液的方法,其中,该方法还包括步骤: 加热经冷却的脱湿废气以提高其浮力来促进其分散。 The method according concentrated waste Bayer process according to claim 5, wherein the method further comprises the step of: heating the exhaust gas to increase the cooling dehumidifying buoyancy to facilitate dispersion.
  7. 7.根据权利要求6所述的浓缩拜耳法废液的方法,其中,加热经冷却的脱湿废气以提高其浮力促进分散的步骤,包括: 通过与热源直接接触或间接接触来加热该经冷却的脱湿废气。 The waste solution was concentrated Bayer process according to claim 6, wherein the exhaust gas is heated by the cooling dehumidifying step to increase buoyancy promote dispersion, comprising: heating the cooled by direct contact or indirect contact with the heat source the dehumidifying the exhaust gas.
  8. 8.根据上述权利要求1所述的浓缩拜耳法废液的方法,其中,将煅烧炉废气与水直接接触从拜耳法煅烧炉废气中回收热量,从而加热水的步骤,包括: 在大气压或接近大气压下,使煅烧炉废气与水接触的步骤。 8. The method according concentrated waste Bayer process according to claim 1, wherein the furnace gas fired direct contact with water to recover heat from the calciner exhaust gas Bayer process, whereby the step of heating water, comprising: at or near under atmospheric pressure, the step of calcining furnace gas in contact with water.
  9. 9.根据权利要求5所述的浓缩拜耳法废液的方法,其中,在将热的煅烧炉废气与冷却的水接触之前,该方法包括步骤: 将热的煅烧炉废气与冷却的脱湿煅烧炉废气接触,从而将冷却的脱湿煅烧炉废气加热。 9. The method as claimed in claim 5, wherein the concentrated waste solution of the Bayer process, wherein, prior to contacting the hot calciner exhaust gas and cooling water, the method comprising the steps of: calcining calcination furnace gas dehumidifying and cooling the hot furnace gas into contact, thereby dehumidifying the cooled exhaust gas is heated calciner.
  10. 10.根据权利要求1所述的浓缩拜耳法废液的方法,其中,将煅烧炉废气与水直接接触的步骤由气-液接触器装置来实现。 10. The method as claimed in claim 1, said waste concentrated Bayer process, wherein the step of calcining furnace gas by direct contact with water gas - liquid contactor apparatus achieved.
  11. 11.根据权利要求10所述的浓缩拜耳法废液的方法,其中,所述气-液接触器装置包括盘式塔、结构填料塔、随机填料塔、流化填料塔、喷雾塔和阶塔式气-液接触器。 11. The method of claim 10, said waste concentrated Bayer process claims, wherein the gas - liquid contactor apparatus comprising a tray tower, a packed column configuration, randomly packed tower, fluidized packed tower, spray tower and tower order type gas - liquid contactor.
  12. 12.根据权利要求10所述的浓缩拜耳法废液的方法,其中,用于实现本发明方法的气-液接触器装置包括用于提高气-液接触的传热和传质率的装置。 12. The method of claim 10 effluent was concentrated Bayer process according to claim, wherein the means for implementing the method according to the invention the gas - liquid contactor comprises means for increasing the gas - means of heat and mass transfer rates of liquid contact.
  13. 13.根据权利要求10所述的浓缩拜耳法废液的方法,其中,该方法包括:在气-液接触器内,将煅烧炉废气与水接触之前, 降低煅烧炉废气温度的步骤。 13. The method of claim 10 effluent was concentrated Bayer process according to claim, wherein, the method comprising: in a gas - liquid contactor within the calciner exhaust gas prior to contacting with water, the step of reducing the temperature of the calciner exhaust gas.
  14. 14.根据权利要求13所述的浓缩拜耳法废液的方法,其中,降低煅烧炉废气温度的步骤包括: 在气-液接触器内,将煅烧炉废气与水接触之前, 使煅烧炉废气直接接触一部分水的步骤。 The method according to claim 13, said waste concentrated Bayer process, wherein the step of reducing the calciner exhaust gas temperature comprises: in the gas - the liquid contactor, contacting the waste gas with water prior to the calciner, the calcined furnace gas directly the step of contacting a portion of the water.
  15. 15.根据权利要求2所述的浓缩拜耳法废液的方法,其中,将拜耳法废液与经加热的水接触以加热拜耳法废液的步骤,包括使拜耳法废液间接接触经加热的水,从而加热拜耳法废液。 15. The method of claim 2 effluent was concentrated Bayer process as claimed in claim, wherein the Bayer process waste water in contact with the heated heating step of the Bayer process waste, the waste comprising contacting the Bayer process indirectly heated water, thereby heating the waste Bayer process.
  16. 16.根据权利要求15所述的浓缩拜耳法废液的方法,其中,使拜耳法废液间接接触经加热的水由垂直管降膜、水平管降膜、垂直升膜、釜式锅炉或加压式煅烧装置来实现。 16. The waste solution was concentrated Bayer process according to claim 15, wherein the Bayer process waste water by indirect contact with the heated vertical tube falling film, horizontal tube falling film, rising film perpendicularly, boiler or autoclave plus calcination pressure means.
  17. 17.根据权利要求16所述的浓缩拜耳法废液的方法,其中,使拜耳法废液间接接触经加热的水由具有壳侧和管侧的降膜蒸发器来实现,且该方法包括步骤: 将经加热的水引入降膜蒸发器的壳侧; 将拜耳法废液引入降膜蒸发器的管侧; 从而加热拜耳法废液,并冷却水。 17. The method of claim 16 effluent was concentrated Bayer process according to claim, wherein the waste water in indirect contact with Bayer process implemented by the heated falling film evaporator having a shell side and a tube side, and the method comprises the step of : heated water introduced into the shell side of the falling film evaporator; the Bayer process waste liquid introducing tube side of the falling film evaporator; Bayer process to heat the waste liquid, and cooling water.
  18. 18.根据权利要求15所述的浓缩拜耳法废液的方法,其中,提供一个以上的装置来加热拜耳法废液。 18. The method of claim 15 effluent was concentrated Bayer process according to claim, wherein the one or more heating means provided to the Bayer process waste.
  19. 19.根据上述权利要求1所述的浓缩拜耳法废液的方法,包括步骤: 从拜耳法废液中凝结蒸发的水分。 19. The method of claim 1 effluent was concentrated Bayer process according to the preceding claims, comprising the step of: condensing the evaporated moisture effluent from the Bayer process.
  20. 20.根据上述权利要求1所述的浓缩拜耳法废液的方法,其中该方法还包括: 进一步对经加热的水进行加热的步骤。 20. The method of claim 1 effluent was concentrated Bayer process according to the preceding claims, wherein the method further comprising: the further step of heating the heated water is performed.
  21. 21.根据上述权利要求1所述的浓缩拜耳法废液的方法,其中该方法还包括步骤: 在从拜耳法煅烧炉废气中回收热量的步骤之前,提高煅烧炉废气的水蒸气含量。 21. The method of claim 1 effluent was concentrated Bayer process according to the preceding claims, wherein the method further comprises the step of: prior to the step of recovering heat from the calciner exhaust gas Bayer process, increasing the water vapor content of the calciner exhaust gas.
  22. 22.根据权利要求21所述的浓缩拜耳法废液的方法,其中, 在从拜耳法煅烧炉废气中回收热量的步骤之前提高煅烧炉废气的水蒸气含量的步骤包括: 使至少一部分煅烧炉废气进入分离器,以提供脱水气流和富含蒸汽的气流。 Step 22. The waste solution was concentrated Bayer process according to claim 21, wherein, to improve the water vapor content of the calciner exhaust gas prior to the step of heat recovered from the calciner off-gas in the Bayer process comprising: reacting at least a portion of the calcining furnace gas enters separator, to provide a steam-enriched gas stream and a dehydrated gas stream.
  23. 23.根据上述权利要求1所述的浓缩拜耳法废液的方法,其中重复所述方法的步骤,以提供连续的工艺。 23. The method of the concentrated waste Bayer process according to claim 1, wherein the step of repeating the process, to provide a continuous process.
CN 200780035168 2006-09-22 2007-09-21 Method of concentrating a bayer process liquor CN101563137B (en)

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EP0335707A3 (en) 1988-03-30 1991-07-03 Alcan International Limited Method for transferring heat between process liquor streams
CN1519520A (en) 2003-02-07 2004-08-11 矢崎总业株式会社 Absorbing cold/hot water heater
WO2005077830A1 (en) 2004-02-16 2005-08-25 Alcoa Of Australia Limited Treatment of alkaline bayer process residues
CN1864812A (en) 2006-04-24 2006-11-22 南京大学 A nitric oxides (NOX) waste pollution control in industrial process and resource reclaiming method

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EP1109740A4 (en) * 1998-08-17 2006-06-28 Comalco Alu Feed processing for improved alumina process performance
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EP0335707A3 (en) 1988-03-30 1991-07-03 Alcan International Limited Method for transferring heat between process liquor streams
CN1519520A (en) 2003-02-07 2004-08-11 矢崎总业株式会社 Absorbing cold/hot water heater
WO2005077830A1 (en) 2004-02-16 2005-08-25 Alcoa Of Australia Limited Treatment of alkaline bayer process residues
CN1864812A (en) 2006-04-24 2006-11-22 南京大学 A nitric oxides (NOX) waste pollution control in industrial process and resource reclaiming method

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