• 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:
    This invention relates to electrostatic methods for the isolation of potassium chloride from sylvinite concentrate. The aim of the invention is to provide the possibility of further electrostatic processing of the concentrate residue on a potassium-enriched product. The method consists in the fact that the initial SF is crushed to a particle size of 1-2 mm, conditioned with a mixture of fatty acids C .. - C. g in an amount of 75 g / t and salicylic acid in an amount of 75 g / t in an atmosphere of air with relative humidity 5 - 12.5%. It is then subjected to tribo-electric charging and three-step separation into a product enriched in potassium chloride and a concentrate residue in an electrostatic free fall separator with a field of 4–4.5 kV / cm circulated by intermediate. At the same time, the product enriched with potassium chloride is additionally conditioned with silicic acid in the amount of 200 g / t and, after triboelectric charging, is fed successively to the 2nd and 3rd stages of electrostatic separation without circulation and circulating the intermediate product, respectively, obtained after the 3rd separation steps the remainder of the concentrate is mixed with an intermediate product of the 2nd separation step. The method allows to obtain from the sylvinite concentrate only by electrostatic separation the potassium salt for fertilizer with a content of 60.4% by weight. 1 tab. (Y) with soy with O5 00 cm
    公开号:SU1329613A3
    申请号:SU833584517
    申请日:1983-04-27
    公开日:1987-08-07
    发明作者:Фрике Гюнтер；Гайслер Иринг
    申请人:Кали Унд Зальц Аг (Фирма)；
    IPC主号:
    专利说明:

     one
    This invention relates to electrostatic methods for the isolation of potassium chloride from sylvinite concentrate.
    The purpose of the invention is to provide the possibility of further electrostatic processing of the concentrate residue on a potassium-enriched product.
    The method is suitable for treating sylvinite ores with a clay content of less than 2% or more.
    The original product has the following composition, wt.%: KC1 41,0; NaCl 55.8; CaS04. 0.3; clay 2.9, or KC1 24.5; 0.5; NaCl 72.3; clay 2.7.
    Before carrying out the process, the crude potassium salt is first crushed to an average particle size of preferably 2 mm. Then, the crushed raw potassium salt is intensively mixed with 75 g / t of a mixture of fatty acids and 75 g / t of salicylic acid, after which the mixture is transferred to a fluidized bed, which is maintained by a stream of air with a relative humidity of 5-12.5 % and the corresponding temperature. In the fluidized bed, the particles of the crushed raw potassium salt are triboelectrically charged together. Immediately after this, the crude potassium salt is fed into an electrostatic free fall separator, between the electrodes of which a high voltage electric field is maintained with a field strength of 4-4.5 kV / cm and which is equipped with a device for circulating the intermediate (average) product removed from this separator ,
    At the base of this separator, a residue is collected near the positive electrode, which, along with a significant amount of salt, contains clay and sulphates, as well as a minor amount of potassium chloride and is thrown away. A concentrate of a valuable product, in which potassium chloride is predominantly contained, is collected near the positive electrode. In the middle between these collection points, an intermediate product is collected, which is returned back and displaced with the crude potassium salt is fed back to the free fall separator.
    The preconcentrate of the valuable product obtained at this stage immediately after that is intensively mixed with 200 g / t of finely ground
    132
    silicic acid and in an atmosphere with a relative humidity of 5-10% as a result of the rapid movement of particles near each other, preferably in the fluidized bed, are triboelectrically charged before being fed back into the free fall separator, in which an electrostatic field of 4-4 is maintained, 5 kW / cm. This separator does not have a device that allows circulation of the product.
    At the bottom of the free-fall separator, a residue is collected near the negative electrode, which consists mainly of rock salt, clay and a small amount of potassium chloride, and is discarded. Near the positive electrode, the first concentrate of the valuable product is collected, which already contains 50 wt.% Or more of KjO. The middle fraction, which falls in the middle between the two free-fall separator electrodes, is collected and after the measures that are described are processed into a valuable potassium product, since its content is more than 25% by weight and cannot be returned due to the relatively high content clay in it.
    The first concentrate of the valuable product without additional conditioning and triboelectric charging is fed to a free fall separator, in which an electrostatic voltage of 4-4.5 kV / cm is maintained. This free fall separator must be provided with a device that allows the medium product to flow in this separator. At the base of this separator, a residual fraction is collected near the negative electrode, which is added to the middle fraction of the previous separation stage. In the vicinity of the positive electrode, potassium salt for fertilizer is obtained as a product with a content of at least 60% by weight in a yield of at least 65%, preferably more than 67%, based on the content of potassium salt. The clay content of this product is less than 1.0% by weight. The middle product leaving the free fall separator is fed back into the separator circulation.
    Example. 100 t / h of crude potassium salt, ground to medium be31
    The particle size of 2 mm, having a composition, wt.%: sylvite 41.0; rock salt 55.8; anhydrite 0.3; clay 2.9, mixed with 75 g / t salicylic acid and 75 g / t mixture of fatty acids with 10-15 C-atoms in the molecule and served in a fluidized bed with a relative humidity of 10%. The mixture coming out of the drying is fed to the right of the free fall separator with a medium circulating product in which the high voltage electrostatic field is maintained at 4-4.5 kV / cm. At the base of this separator, near the negative electrode, a residue is obtained, which is discarded. This residue and the residue after the first separation stage are obtained in an amount of 52.0 t / h with a KjO content of 2.4 wt.% And a clay content.
    3.1mae%
    A middle fraction is taken in the middle between the two electrodes of the second separation stage, while a valuable product concentrate is taken near the positive electrode and fed to an electrostatic free fall separator (4-4.5 kV / cm field) circulating the middle product. At the positive electrode at the base of this separator, 38.9 t / h of potassium salt for fertilizer with a KjO content of 60.4% by weight and 0.5% by weight of clay is collected as a product. A residual fraction is precipitated near the negative electrode, which is mixed with the middle fraction and fed to a roller electric separator of known construction with a field strength of 4-5 kV / cm, after which the mixture is again charged with 15-15-25% relative humidity. .
    From this separator is selected
    8.2 t / h residue, which is discarded with a content of 13.8 wt.% And
    13.0% weight. clay The fraction of the valuable product taken from this separator is fed back to the beginning of the first separation stage.
    The results of the experiments are presented in the table.
    13
    Continuation of the table Content,%


    Yield.% Of raw potassium salt used:
    K, O Clay
    Product 90.7 6.7 Ejection residue 9.3 93.3 The proposed method allows the potassium salt for fertilizer containing 60.4% by weight to be obtained from the clay-containing crude potassium salt only by electrostatic separation.
    权利要求:
    Claims (1)
    [1]
    Claims.
    The method of separation of potassium chloride from sylvinite concentrate by multi-stage electrostatic separation, including grinding the raw material to a particle size of 1-2 mm, conditioning the crushed raw material with an organic acid in an atmosphere of air with a relative humidity of 5-12.5%, triboelectric charging it and potassium chloride product and concentrate residue in an electrostatic free fall separator with a field strength of 4–4.5 kV / cm with an intermediate circulating, characterized by That, in order to enable further electrostatic processing of the concentrate residue to the potassium-enriched product, 75 g / t of fatty acids and 75 g / t of fatty acids are used as the organic acid, and the product enriched with potassium chloride is further conditioned with silicic acid in the amount of 200 g / t and after triboelectric charging, are fed sequentially to the second and third stages of the electrostatic section 51329ЗЗ6
    Neither without circulation and with circulation of separation, the xxcentral mixture of the intermediate mixture corresponds to the intermediate product second obtained after the third stage of the different separation stage.
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    同族专利:
    公开号 | 公开日
    ES8402516A1|1984-02-01|
    DD209181A5|1984-04-25|
    DE3216735C1|1983-08-25|
    ES522077A0|1984-02-01|
    FR2526417B1|1990-06-01|
    CA1184046A|1985-03-19|
    FR2526417A1|1983-11-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    RU2555906C1|2014-02-11|2015-07-10|Закрытое акционерное общество ВНИИ Галургии |Method of processing potassium-containing ores|FR1390910A|1962-08-24|1965-03-05|Kali Forschungsanstalt Gmbh|Process for the electrostatic treatment of crude salts containing carnallite|
    DE1953534C3|1969-10-24|1974-03-14|Kali Und Salz Ag, 3500 Kassel|Process for the electrostatic treatment of crude potash salts containing Kiesent|DE3439042C2|1984-10-25|1988-07-28|Kali Und Salz Ag, 3500 Kassel, De|
    DE3825461C2|1988-07-27|1991-01-31|Kali Und Salz Ag, 3500 Kassel, De|
    DE102007049182B3|2007-10-13|2009-05-14|Kali-Umwelttechnik Gmbh|Producing potassium-magnesium-fertilizer and filling material, from polymineralic raw potassium salt, comprises e.g. fragmenting dry raw salt by sieving to different fractions and separating to magnetic and non-magnetic fractions|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19823216735|DE3216735C1|1982-05-05|1982-05-05|Process for the production of potash fertiliser salt with a K2O content of at least 60 % by weight, by multistage electrostatic separation|
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