• 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:
    Bayer process liquors are purified by removing at lesst a portion of the organic impurities, by treating the liquor, containing Bayer process or added solids, such as red mud particles, alumina trihydrate, oxalate salt or filter aids, with a water-soluble cationic polymeric quaternary ammonium salt (POLYQUAT salt), which adheres to the surface of the dispersed solids. The resulting organic coating or layer provides a receptive surface for the organic impurities, thus allowing formation of a solid-Polyquat-organic adduct, which is easily removed from the Bayer system.
    公开号:SU1563589A3
    申请号:SU853996103
    申请日:1985-12-26
    公开日:1990-05-07
    发明作者:Дж.Рое Вильям；Т.Малито Джон
    申请人:Налко Кемикал Компани (Фирма)；Кайзер Алюминум Энд Кемикал Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the production of alumina and can be used in the purification of liquors in the Bayer process.
    The purpose of the invention is to increase the efficiency of the process.
    The preferred water soluble, cationic, polymeric salt of a quaternary ammonium base is polydiallyldimethylammonium chloride (polydamam). This substance is obtained from monomeric diallyldimethylammonium chloride (dadmah), which has the following chemical structure:
    cis
    ngs s-sn-to-sn3
    H7.
    n
    sg
    In this process, use
    copolymers of dadmach with vinyl monomers.
    In each test, 10 g of an alumina trihydrate seed are added to 100 ml of lye, which is heated to 145-150 ° F (62.8-65.6 ° C).
    The cationic polymeric compounds listed in Table 2 are added to this dispersed medium with solids. one.
    Then stirred for 15 minutes, after which the suspension is filtered through filter paper. Absorbance measurements are carried out for
    filtrates.
    Absorbance is measured at a wavelength of 691 nm using a 1 cm cell on a Bausch and Lomb spectrophotometer 100.
    SP
    C & S JV
    100

    cm
    Table 1
    Polydadmah firmness:
    0.2
    0.2
    0.2
    0.2
    0.2
    0.6-0.8
    0.6-0.8
    0.6-0.8
    0.6-0.8
    0.6-0.8
    1.0-1.2
    1.0-1.2
    1.0-1.2
    1.0-5.2
    1.0-1.2 Epichlorohydrin
    1T
    m
    Ethylene Dichloride / NH-, J
    Dudham / acrylamide with specific viscosity:
    The introduction of the cationic quaternary ammonium salt into the Bayer liquors can be carried out at those stages of the Bayer process where liquor contains dispersed solids or where solids can be added and dispersed (in the thickening and washing of red mud).
    0.078 0.068 0.058 0.050 0.034 0.070 0.056 0.042 0.034 0.030 0.075 0.060 0.063 0.050 0.039 0.075 0.068 0.069 0.065 0.063 0.075 0.077 0.077 0.074 0.062
    13 27 36 56
    20 40 51 57
    20 16 33 52
    9
    eight
    13
    sixteen
    ABOUT
    about
    one
    17
    five
    The water-soluble vinyl cationic quaternary ammonium polymer salt is used in the range of 1-450 mg / L and preferably 2.0-50 mg / L, depending on the concentration of solids in the suspension. Depending on the amount of polymeric salt taken for purification, the content of humate (determined colorimetrically) can vary from 7 to more than 50%. The humates removed from the liquor are removed with sludge.
    The removal of humates can be carried out by introducing the polydadmach into the suspension of the filtering medium before mixing it with the liquor. ,
    The humates can be removed from the hydrated alumina slurry by introducing polydamax into the slurry that is to be filtered.
    In all cases, polydadmac materials are aqueous solutions containing 20 wt.% Of active polydadmach copolymer.
    Example 1. A suspension containing hydrated alumina and lye with an average solids concentration of 50.7% by weight, with a temperature of about 58 ° C is treated with poly dadmah in the form of a 20% active solution or in the form of a 20% diluted product. Polydadmas are injected on the suction side of the pump feeding the slurry to the filter.
    Absorbance measurements are carried out at a wavelength of 691 nm using a 4 cm cell on a spectrophotometer.
    The effect of polidadmaha on the removal of humate from a suspension of hydrated alumina is presented in Table 2.
    From tab. 2, it follows that dilution does not significantly affect the removal efficiency of humates. iTable2

    Removal of humate, wt.%
    20% active solution in water. Added without additional dilution.
    EXAMPLE 2 Enriched liquor, which is obtained from the red mud upper sump, is treated with polydynamics prior to filtration to remove residual dispersed red mud particles.
    Polydamam and filtering agents are introduced into the liquor. To remove humates, a solution of the polydamacid product (20% of the active substance) is used at a dosage of 18, 31 and 57 mg / l of suspension. The polydamacous treatment agent is first diluted with water to a concentration of 194, 224, 302 mg / l, respectively, before feeding to the liquor. Then the enriched liquor containing polydadmas is filtered on filter presses, on which there is a preliminary coating of the filtering agent.
    The results for the removal of humates are given in table. 3
    Table3
    Poly dosage - 20 dadmaha, mg / l
    Removal of humate, wt.%
    25
    EXAMPLE 3 Polydidmach efficiency was tested in the removal of humates from boiled suspensions of the Bayer process, and these suspensions were treated prior to the separation of the red mud by settling. Raw suspension tank having a temperature of 90-99 ° C, in contact with
    different dosages of the 20% active polydamacid solution and, after removing the red mud, the absorption of the treated suspensions is compared with the absorption values obtained for
    raw suspension.
    The results of the removal of humates from suspensions containing red mud are given in table. four.
    45
    Table 4

    Removal of humate, wt.%
    50
    55
    20% active solution in water.
    The cationic polymer salt of the quaternary ammonium base is not
    It has a detrimental effect on traditional anionic flocculants, which are usually added to the Red Sludge slurry to facilitate the settling of the red sludge, hence polydadmas can be easily introduced into the red mud slurries either before or after the addition of traditional flocculants. However, it is preferable to add Five polymeric salts of Quaternary ammonium base before adding flocculants.
    The proposed method allows to increase the efficiency of the purification process from organic compounds,
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    1. A method for removing organic impurities such as humates from liquids and suspensions of the Bayer process containing dispersed solids by treating them with a reagent and then separating the solids, characterized in that, in order to increase the efficiency of the process, a water soluble vinyl cationic polymer salt of a quaternary ammonium base with a characteristic viscosity of 0.1-1.5 dl / g in an amount of 1.0-450 mg / l.
    15635898
    4. Method according to paragraphs. 1 and 2, characterized in that a dially dimethyl ammonium chloride homopolymer is used as a water-soluble vinyl cationic polymer salt of a quaternary ammonium base.
    5. A method according to claim J, characterized in that the dispersed solids are selected from the group of: hydrated alumina, red mud, filtering agents, ocadate salts, and mixtures thereof.
    6. Method according to paragraphs. 1-5, characterized in that a water-soluble vinyl cationic polymeric salt of a quaternary ammonium base is added to the slurry slurry before it is separated from the liquor.
    7. Method according to claims 1-6, characterized in that anionic flocculus nt is introduced into the slurry suspension.
    8. Method pop. 6i7, ex15
    20
    25
    thirty
    water soluble vinyl cationic polymeric salt of a quaternary ammonium base, use the homonymer Diallyldimethylammonium chloride and inject it before the introduction of the anionic flocculant and subsequent separation,
    9. Method according to Clause 1, characterized in that as the liquor, the filtrate is used after separation of the red mud, and as dispersed solids - filtering agents,
    2, the method according to claim 1, characterized in that diallyldimethylammonium chloride polymer is used as a water-soluble vinyl cationic polymer salt of a quaternary ammonium base,
    3. A method according to claim 1. characterized in that a vinyl cationic polymer containing a diallyldimethylammonium chloride monomer is used as a water soluble vinyl cationic polymer salt of a quaternary ammonium base.
    Compiled by N.Tselikova Editor N, Tupitsa Tehred M. Didyk
    Order 1069
    Circulation 410
    VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR
    113035, Moscow, Zh-35, Raushsk nab. 4/5
    0
    five
    0
    five
    water soluble vinyl cationic polymeric salt of a quaternary ammonium base, use the homonymer Diallyldimethylammonium chloride and inject it before the introduction of the anionic flocculant and subsequent separation,
    9. Method according to Clause 1, characterized in that as the liquor, the filtrate is used after separation of the red mud, and as dispersed solids - filtering agents,
    10. A method according to claim 5 and 9, characterized in that the filtering means is treated with a water-soluble vinyl cationic polymer salt of quaternary ammonium base, and then alkali is introduced
    11. A method according to claims, 55, 8 and 10, characterized in that particles containing calcium are used as filtering agent.
    Proofreader M. Pojo
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    引用文献:
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    法律状态:
    优先权:
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