• 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 process prepares magnesium chloride prills suitable for the electrolytic production of magnesium from a melt. Molten magnesium chloride hydrate having a moisture content corresponding to from about 3.8 to about 6.2 moles of H2O per mole of MgCl2 is converted into droplets which are solidified to form prills. The prills are dehydrated to the desired low-moisture magnesium chloride or substantially anhydrous magnesium chloride.
    公开号:SU764606A3
    申请号:SU701486698
    申请日:1970-10-28
    公开日:1980-09-15
    发明作者:Бэйюм Эйстейн；Эйгил Эриксен Карстен；Сольберг Пер；Валлин Тветен Кжелл
    申请人:Норск Гидро А.С. (Фирма)；
    IPC主号:
    专利说明:

       , : t The invention relates to the field of obtaining magnesium chloride, suitable for use in the processes of obtaining metallic magnesium electrolysis of the melt, in particular, to methods of dehydrating hydrated magnesium chloride. A known method for the dehydration of hydrated magnesium chloride by spraying its melt followed by cooling in a gaseous or liquid medium. 1 The disadvantages of this method are the small size of the particles produced (4 ~ 15 microns) and significant product losses in the form of dust, 20% DL. In order to eliminate these drawbacks, it is proposed to spray molten magnesium chloride with a content of 3.8-6.2 mol, HIO per 1 mol MgCIj at J18-195C .. and obtained after cooling the granule to further dehydrate, in two stages: in the first stage to a content of 2.0-2.8 moles per mole of MgCIa using real gas, such as air, and in the second stage water is finally removed using chlorine hydrogen gas. The proposed method allows obtaining granules with a size of 0.15-3 mm, preferably 0.5-2 mm, based on hydrated magnesium chloride with a content of 4.0-4.7 mol HgO per 1 mole of MgCIj, and sizes 2-6 mm , predominantly 4-g6 mm, based on padratirovanny magnesium chloride with a content of 4.8-5.8 mol per 1 mol MgCIj. The loss of the product is less than 0.5 wt.%. The essence of the proposed method is as follows. Magnesium chloride tetrahydrate is sprayed as a glue melt to obtain granules of sizes 0.5-2 mm. The temperature of the -granulated product is, the ratio of the cooling air flow to the flow rate in the nozzle is 20 nmkg of pellets, the temperature of the supplied cooling air at the bottom of the granulation column is 40% relative humidity, the outlet temperature, the loss of moisture in the column is less than 0, 1 mole per 1 mole of Mgcii,
    When preparing granules with a size of about 5 NtM, use cymity by spraying in a centrifuge or through a sieve at a pressure of from a few millimeters to 300 mmHg, st. The size of the granules is usually double the diameter of the hole,
    Granules with a size of 4-6 mm mragut. be obtained, for example, in a 25-meter column, and the height of the latter depends on the speed and temperature of the cooling gas. In order to obtain granules larger than 6 mm, it is necessary to use columns of greater height, 50 meter long. Upon receipt of such large granules, it is advisable to introduce seed crystals, for example, by blowing into the granulation chamber. The amount of seed is in the order of 10% by weight .. ..
     Upon receipt of granules with a size of 0.52.0 mm, it is advisable to use a pressure of 200600 Mm mercury, st. When this hole nozzles should be significantly larger than the size of the resulting granules.
    In all cases, the temperature of the melt is controlled so that it is just above, approximately, the solidification temperature,. The temperature required depends on the moisture content of the melt.
    Further dewatering can be carried out, for example, in coal mines to a content of 2.3-2.5 mol H, O per 1 mol MgCI using air. Dehydration to a lower water content in this stage 5 can cause partial hydrolysis, as well as lead to undesirable sintering at the top of the column.
    With the final dehydration in the fluidized bed using gaseous hydrogen chloride, the remaining moisture is reduced. The resulting anhydrous product contains less than 0.2% MDO, On
    At this stage, it is advisable to use pure hydrogen chloride with a moisture content of about 0.5% by weight, however, it can be decomposed with an inert gas. Tables give examples of the implementation of the proposed method.
    Table 1 shows the data related to the production of large granules; Table 2 shows the -2 data related to the dehydration of these granules in the mine column.
    Table 3 shows the data related to the preparation of small granules; Table 4 shows the data related to the dehydration of these granules in the fluidized bed.
    Table
    In all examples, the gas cooled is airtipH at room temperature. Characterizes the temperature of the melt immediately before
    by spraying
    Ha; rakterizuet pressure debate along the sieve.
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    go zgg ii; r ;; li, vt iis iit:: 8 192 500 3.2 50. 275 500 3.2 4.5 275 io jaa-jvJ / v “i, sl, -Jk-JiiAr- i.- -500 5.3 18 375 STjii T-. fe- -,. tf- K500 5.3 18 375.
    ; 3SS jr ::; ri - - ::::
    764606
    Table 3. O, 1-2.0 mM 7.2%) 0.5-1.0 mm 39.3% 0.125-0.2 mm 7.8%; 0.063-0.125 MM 0.7%; 1.0-2.0 mm 9.7%; o, 5-1.0 mm 38.6%; 0.2-0.5 mm 41.2%; 0.125-0.2 mm 7.9%; 0.063-0.125 mm 2.6% 1.6-2.0 mm 7.9%; 0.5-1.0 mm 56.2%; 0.2-0.5 mm 34.3%; 0.126-0.2 mm 1.6%; 0.0 (53-0.125 mm 0% 1.0-2.0 mm 36.6%; 0.5-1.0 mm 50.9%; 0.2-0.5 mm 12.6%; O , 125-0.2 mm 0.6%; 0.063-0.125 mm 0.1% 1.0-2.0 mm 30.8%; 0.5-1.0 mm 43.0%; 0.2- 0.5 mm 23.0%; 0.125-0.2 mm 2.7%; 0.063-0.125 mm 0.5%
      In during ex; In the examples, the average residence time of particles (dehydration time) is 0.3-0.6 hours.
    2 oL - critical bed height, D - diameter of the fluidized zone
    V- speed (s), calculated for unloaded camera
    权利要求:
    Claims (1)
    [1]
    fluidization. -ot (minimum speed. pseudo-liquefaction). The invention of the method of magnetization of magnesium chloride by spraying its melt followed by cooling, for example, in a gaseous medium, is also distinguished by the fact that, in order to reduce product loss and obtain it as a strong gr., Melted chloride is spraying. magnesium with a content of 3.8-6.2 mol per 1 mol MgCIg.npH. 118-195 ° C and obtained after cooling the granules under Table 4. They further dehydrate in two stages, with the first stage being dehydrated to a content of 2.0-2.8 moles of NdO per 1 mole of MgCiu using real gas, such as air, and water is removed by an extra step using hydrogen chloride gas. . Sources of information taken into account in the examination of g 1, US Patent 3395977, published. 08/06/68, cl. 23-91 (prototype).
    类似技术:
    公开号 | 公开日 | 专利标题
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    同族专利:
    公开号 | 公开日
    FR2065576A1|1971-07-30|
    US3742100A|1973-06-26|
    CA947923A|1974-05-28|
    LU61920A1|1971-05-04|
    IL35482D0|1970-12-24|
    IL35482A|1973-06-29|
    DE2052470A1|1971-05-13|
    NL166908C|1981-10-15|
    DE2052470B2|1974-10-31|
    OA03593A|1971-03-30|
    NO122915B|1971-09-06|
    ES384984A1|1973-03-16|
    FR2065576B1|1974-12-20|
    NL166908B|1981-05-15|
    NL7015870A|1971-05-04|
    JPS5018478B1|1975-06-28|
    GB1329718A|1973-09-12|
    BE758221A|1971-04-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3127249A|1964-03-31|Ammonium nitrate |
    US1871428A|1928-05-25|1932-08-09|Dow Chemical Co|Flake magnesium chloride and method of making same|
    US1874735A|1929-06-24|1932-08-30|Dow Chemical Co|Process of dehydrating magnesium chloride|
    US3130225A|1962-02-12|1964-04-21|Pullman Inc|Urea production|
    US3577560A|1968-03-27|1971-05-04|Dow Chemical Co|Method of forming pellets of a flux composition|DE3117542A1|1981-05-04|1983-02-10|Franz Josef Gattys Ingenieurbüro für Chem. Maschinen- und Apparatebau, 6078 Neu-Isenburg|METHOD FOR STABILIZING DEHYDRATED MAGNESIUM CHLORIDE AGAINST RUECK HYDRATION|
    US4981674A|1988-12-13|1991-01-01|Noranda, Inc.|Production of anhydrous magnesium chloride|
    US5565080A|1994-05-17|1996-10-15|Noranda Metallurgy Inc.|Preparation of anhydrous magnesium chloride-containing melts from hydrated magnesium chloride|
    NO309260B1|1996-10-11|2001-01-08|Norsk Hydro As|Process for preparing magnesium chloride granules|
    NO308352B1|1997-06-20|2000-09-04|Norsk Hydro As|Process for producing anhydrous MgCl2|
    CA2250605C|1998-10-15|2003-07-22|Cominco Ltd.|Drop forming method and sulphur polymer concrete process|
    US6841185B2|2001-10-19|2005-01-11|The Procter & Gamble Co.|Flavored coffee compositions and methods of making the same|
    US20030180431A1|2001-10-22|2003-09-25|The Procter Gamble Co.|Flavored coffee compositions with stable flavors and method of making|
    US20060252831A1|2005-05-06|2006-11-09|Christopher Offen|Method for the treatment of magnesium and potassium deficiencies|
    WO2009143072A1|2008-05-19|2009-11-26|Wynden Pharmaceuticals, Inc.|High-loading, controlled-release magnesium oral dosage forms and methods of making and using same|
    AU2012363594B2|2011-12-21|2014-08-14|Gambro Lundia Ab|Dialysis precursor composition|
    US10288348B2|2014-01-10|2019-05-14|Compass Minerals America Inc.|Method of drying salt and similar materials through the use of heat engine waste heat|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    NO4293/69A|NO122915B|1969-10-29|1969-10-29|
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