• 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:
    Stabilized NH4NO3 containing granules are produced by dissolving in an aqueous NH4NO3 solution Mg(NO3)2 and, if desired, suspending mineral filler, spraying the resulting solution or suspension over nuclei maintained in spaced interrelationship and contacted with a hot stream of gas at a temperature of the nuclei of between 120 DEG and 135 DEG C., and cooling the resulting granules in such a manner that, between 70 DEG C. and 50 DEG C., they remain substantially homogeneous in temperature.
    公开号:SU1421257A3
    申请号:SU802894302
    申请日:1980-03-14
    公开日:1988-08-30
    发明作者:Анри Прюдан Ван Хийфт Вилли；Арсен Жозеф Гетхальс Рафаель
    申请人:Компани Неерландэз Де Л,Азот (Фирма)；
    IPC主号:
    专利说明:

    N5
    : l
     cm
    This invention relates to a process for the preparation of ammonium nitrate granules.
    The purpose of the invention is to improve the quality of the product by reducing the porosity of the pellets because of their density and strength.
    Example 1 Into a solution of ammonium nitrate with a concentration of 95% by weight, magnesium nitrate is introduced in an amount of 2 May: on the content of ammonium nitrate. Nit-: magnesium rat can be introduced by adding-: laziness to the original solution of amionium nitrate with 0.6 wt.% MgO followed by: we are heating the solution at 170 ° С
    within 2 hours
    In a fluidized bed apparatus equipped with two sprinklers with a water mass (1200), 40 kg of ammonium nitrate with an average diameter of 2 ,, 4 mm are diluted to a maximum of about 30 cm
    By adjusting the air temperature, the temperature of the fluidized bed is set to between 120-135 ° C. The resulting ammonium nitrate solution containing magnesium nitrate is introduced by spraying into a fluid-bed granulator at 150 ° C and a speed of 120 kg / h. Spraying is carried out using air at a temperature of 160 ° C and a pressure of 245.2 kPa
    After 1 h of operation, the granulator is disconnected. The obtained granules immediately
    cooled with outside air to 90 ° C
    : and sift.
    The fraction of particles with a grain size of 4-6 mm, which is about 93 to the product, is cooled in the drum in the temperature range 70 - at a cooling rate of not more than 3 deg / min. The characteristic of the obtained product: the content of water in the granules is about 0.3 wt. .%; Mg (Hz) 2 - 165 wt.%, The density of the granules after cooling is 1634 g / cm, the strength of the granules (crush resistance) is 35, ЗН. „The granules have a smooth closed
    the surface, the porosity index, determined by the oil absorption, is 1%,
    The oil absorption of the obtained granules after 5 cycles of their heat treatment in the temperature range 25-50 ° C does not change and is 1%. This parameter characterizes the stability of the obtained granules in time and under the influence of the temperature factor, since it is known that when ammonium nitrate granules pass the 32 ° C temperature limit several times in either direction, they lose strength, swell, become porous and scatter. into powder. In addition, highly porous granules are explosive. The granules obtained by the proposed method have good resistance to detonation.
    Example 2. In a similar way as described in example 1, an aqueous solution of ammonium nitrate with a concentration of 95% by weight, containing 2% by weight of Mg (NO2), j o is prepared. In this solution, up to 45% by weight of ground to particle size 0 is suspended, 2 mm dolomite, for example 4 wt.%, Based on the total amount of ammonium nitrate and dolomite. The resulting suspension is granulated in a cylindrical apparatus with a conical bottom. The cylindrical part of the apparatus has a diameter of 25 cm and a height of 50 cm, the height of the conical part is 20 cm. The conical bottom is provided with a central hole having a diameter of 4 cm, which is connected to the air duct “The vessel is filled to a height of a layer of 30 cm with ammonium nitrate granules with a grain size of 0 5-2.5 mm.
    ABOUT
    Air is supplied to this layer at 130 ° C and a pressure of 2.8 kPa at a speed of 400 m / C. A suspension is introduced through a sprinkler at 160 ° C, a pressure of 150 kCa and a speed of 20 kg / h. The temperature in the layer is 120 ° C. After one hour, the granulation process is stopped. The product is removed from the vessel and air cooled to approximately 45 ° C for 30 minutes.
    The granulated product has the following properties: moisture content 0.35%, granule strength 37.3 N, density 1.63 g / cm, Oil absorption 1.0%, Oil absorption after 5 cycles of temperature treatment at 25-50 ° C 1.1% , the stability is good, the appearance is rounded granules with a smooth surface.
    The table presents data on the effect of ammonium nitrate and magnesium nitrate concentrate in the initial solution on the properties of the granulated product. Granulation is carried out at 120 ° C, cooling is carried out with a temperature change from 70 to 50 ° C at a rate of 3 deg / min.
    The table shows that in the range of concentrations of ammonium nitrate in a solution of 85-97.5 wt.% In the presence of Mg (M03) 7, it is possible to obtain stable non-explosive ammonium nitrate granules with high density, strength and minimal porosity. Granules are resistant to cyclic temperature fluctuations up to -20 and + 60 ° С without swelling.
    or scatter them into powder. This gives u continuously or periodically.
    the ability to store granulated ammonium nitrate in closed bags in the air.
    The use of solutions with a lower concentration of ammonium nitrate leads to an increase in the water content of the granules and to a decrease in the product yield per unit time. The increase in the concentration of ammonium nitrate to 99.5%, corresponding to almost anhydrous, the melt of ammonium nitrate, it is impractical because it leads to an increase in the cost of
    The introduction of a stabilizer of magnesium nitrate in an aqueous solution of ammonium nitrate in an amount of 0.5-3.0 wt.% Does not change the properties of the granulated product shown in the table. The concentration of N§ (N03) 2 is less than 0.5 wt.%
    The granules having the required granular composition (4-6 mm) are cooled so that the granules are left at a temperature limit of 70-50 ° C. This is achieved by cooling the granules at a uniform cooling rate not exceeding 3 degrees / min
    With an increase in cooling rate of 2Q, for example, to 3.5 K / min per minute, the properties of the granules change and their stability, expressed through oil absorption, measured after 5 cycles of heat treatment of the grain in the range of 25-50 ° C, is 4% .
    In order to reduce the plasticity, the product granules are preferably cooled immediately after their preparation.
    leads to a decrease in the density of the granules at zo ° temperature above 70 ° C, namely
    80-90 C. It is then recommended to sift the granules, after which the fraction passed through the sieve can be directly returned to the granulation, and the fraction having the required dimensions is cooled.
    The advantages of the proposed method of obtaining granulated
    to 1.55 g / cm and an increase in oil absorption up to 3.0%.
    Concentration of Mg (N (p more than 3.0% is impractical because the granules acquire plasticity due to the presence of a large amount of liquid phase in the granules).
    The study showed that when using an aqueous solution of ammonium nitrate with a concentration of 85-97.5 wt.% In the presence of 0.5-0.3 wt.% MgCNOj), it is advisable to conduct granulation in the fluidized bed in the temperature range 120-135 ° C the subsequent cooling of the granules with a temperature change from 70 to 50 ° C at a rate not exceeding 3.0 deg / min.
    As the temperature of the fluidized bed rises above 135 ° C, the granules become so plastic that they agglomerate easily, forming a sintered agglomerate at the bottom of the apparatus. A decrease in temperature below 120 ° C leads to a deterioration of granule formation, in particular, to the formation of small nonstandard particles.
    As particles of ammonium nitrate introduced into the granulator and forming
    35
    40
    45
    50
    55
    Ammonium nitrate should also include energy savings on evaporation of ammonium nitrate solution, equipment cost savings, since there is no need for an evaporator, reducing the risk of decomposition of ammonium nitrate due to a decrease in the granulation temperature.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    1 o A method of producing ammonium nitrate granules in a fluidized bed of finished product granules by spraying on them an aqueous solution of ammonium nitrate with a spraying agent, characterized in that, in order to improve the quality of the product by reducing the porosity of the granules and increasing their density and strength spraying subjected to
    fluidized bed, use pieces of ammonium nitrate and pellets of the product, which pass through a sieve after sifting.
    The droplet size of the ammonium nitrate solution when spraying is 0.01-0.1 mm. Granulation by the proposed method can be maintained
    The granules having the required granular composition (4-6 mm) are cooled so that at a cooling temperature limit of 70-50 ° C the granules are left homogeneous. This is achieved by cooling the granules at a uniform cooling rate not exceeding 3 degrees / min
    When the cooling rate is increased, for example, to 3.5 K / min per minute, the properties of the granules change and their stability, expressed through oil absorption, measured after 5 cycles of heat treatment of the granules in the range of 25-50 ° C, is 4%.
    In order to reduce the plasticity, the product granules are preferably cooled immediately after their preparation.
    40
    45
    50
    55
    Ammonium nitrate should also include energy savings on evaporation of ammonium nitrate solution, equipment cost savings, since there is no need for an evaporator, reducing the risk of decomposition of ammonium nitrate due to a decrease in the granulation temperature.
    Invention Formula
    1 o A method of producing granules with ammonium nitrate in the fluidized bed of the granules of the finished product by spraying on them an aqueous solution of ammonium nitrate with a spraying agent. spraying subjected to
    142
    ammonium nitrate solution with a concentration of 85-97.5 wt.%, containing magnesium nitrate in an amount of 0.3-3.0 wt.% of the content of ammonium nitrate, and the temperature of the fluidized bed is maintained within 120 135 ° C, followed by cooling the resulting granules in tempera temperature range,% (granular porosity)
    Stability of granules,% Durability of granules, N
    SHO 1.0 1,0 1,0 0,9 1,1 1,0 6, 1 1,0 6,0
    37.3 35.3 32.4 38.2 31.4
    257
    tour 70 - 50 ° С with a speed not exceeding 3.0 K / min.
    2o The method according to claim 1, wherein the ammonium nitrate solution additionally contains finely ground dolomite in an amount of up to 45 wt.%, Calculated on the total amount of ammonium nitrate and dolomite.
    0.9
    1.1
    39., 2
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    同族专利:
    公开号 | 公开日
    AT372361B|1983-09-26|
    DK151190C|1988-06-27|
    BE882214A|1980-09-15|
    DE3008891A1|1980-09-18|
    GB2045735B|1983-03-16|
    GR67266B|1981-06-26|
    NL7902086A|1980-09-17|
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    JPS6038335B2|1985-08-31|
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    FI66341B|1984-06-29|
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    FR2451351B1|1983-03-25|
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    DE3008891C2|1984-08-09|
    SE439155B|1985-06-03|
    TR20418A|1981-06-26|
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    NO149658B|1984-02-20|
    FR2451351A1|1980-10-10|
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    DZ230A1|2004-09-13|
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    DK151190B|1987-11-09|
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    CH431576A|1964-01-07|1967-03-15|Inventa Ag|Process for granulating nitrogenous fertilizers|
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    GB1136019A|1966-05-11|1968-12-11|Armour & Co|Ammonium nitrate stabilization|
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    US8721760B2|2006-01-13|2014-05-13|Honeywell International Inc.|Compositions comprising ammonium nitrate double salts|
    DE102010032021B4|2010-07-16|2016-09-29|Sandvik Materials Technology Deutschland Gmbh|Process for producing particles containing ammonium nitrate|
    NO336052B1|2012-08-29|2015-04-27|Yara Int Asa|Safe mixtures of ammonium nitratewith urea, or of an AN-containing product with a urea-containing product|
    NO341768B1|2012-08-29|2018-01-15|Yara Int Asa|Passivated urea and fertilizer mixtures|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    NLAANVRAGE7902086,A|NL173387C|1979-03-15|1979-03-15|METHOD FOR MAKING STABLE AMMONIUM NITRATE CONTAINING FERTILIZER GRAINS.|
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