CN1594238A - Production process of urea-based compound fertilizer by fused carbamide - Google Patents

Abstract

The invention provides a production process of urea-based compound fertilizer by fused carbamide comprising, subjecting melt urine with 90-99.7% of concentration and 130-145 deg. C to successive reaction with potassium salt in reactor, storage, conveying, atomization, granulation.

Description

Molten urea solution coproduction urea-base compound fertilizer novel process

[technical field]

Molten urea solution coproduction urea-base compound fertilizer novel process, be molten urea solution and the sylvite reaction that makes with industrial production urea, generate melting charge slurry,, belong to chemical industry class fertilizer field again through atomizing, spray granulating, no drying, no returning charge, free of contamination coproduction urea-base compound fertilizer novel method.

[background technology]

Urea-base compound fertilizer is all to be nitrogenous source with urea, the common name of compound manure such as the UNK of processing and fabricating, UNP, UNPK.It is documented, abroad as far back as the sixties in 20th century just in the phosphorus ammonium is produced, switch and produce the UNAK urea-base compound fertilizer and succeed.But in the monoammonium phosphate device that China introduces thereafter, when test manufacture, switch urea-base compound fertilizer because of various reasons and baffle, have to replace so that other nitrogen is former.The work in-process that present domestic application makes with industrial production urea.It is the method that molten urea solution is produced common NPK composite fertilizer or urea-base compound fertilizer, generally be to be that 90-99.7%, temperature are 130-145 ℃ of urea liquation with concentration, directly be sprayed onto ammonium phosphate, potash fertilizer and add material upward so-called " bonding " or " spray granulating ", make through supervisors such as two sections dryings, cooling, screening, parcel, metering packings again, substantially be equal to mutually with former dry powder blend granulating method technology, the numerous rope of technology not only, production equipment is huge, and yield poorly, energy consumption height, produce market are striven power unexpectedly and are burst general.

And acquired ZL97100650.4 of the applicant and ZL98111778.3 Chinese invention patent, though realized spray granulating truly, no drying process, and it is stable to have obtained chemical property, the urine base UNK, UNPK two elements, three element compound fertilizer or the composite organic-inorganic fertilizer that meet national standard (common composite fertilizer), but still exist the slip preparation time long, discontinuous and conveying, spray granulating, no returning charge operation location are inaccurate, lack of standardization and the not high shortcoming of production monitoring level of automation is difficult to adapt to the code requirement of Modern high-tech industryization.The preparation of two patented technologies and slip, all are liquid ureas that industrial production urea is made, be that concentration is the 90-99.5% temperature at 130-145 ℃ molten urea solution, through liquid flow mearuement, add in the retort, be metered into Repone K or vitriolate of tartar by batch of material simultaneously, restart and whisk slurry, just can make in about 40-60 minute and to contain N, K ₂O dissolves slip, and exports, atomizes, is sprayed onto on the basic powder and implement spray granulating through Liquid Level Pressure discharge method, makes desired product through cooling, screening, metering packing again.

As mentioned above, the slip of two patents all is add quantitative molten urea solution, sylvite in retort after, just make and implement spray granulating through long-time reaction, therefore also claim " batch operation ", every for this reason cover combination preparing device must drop into the running of 3-4 platform retort simultaneously, could satisfy the slip supply, and producing the operation pipeline thus switches, operates towards many numerous ropes such as Xian, maintenance, also restrict production sequence control and do not have the returning charge operation, increased material loss, make unstable product quality, make the business economic benefit impaired.

[invention order ground]

Molten urea solution coproduction urea-base compound fertilizer novel process, will change the fixing batching of slip preparation, batch operation etc. exactly directly cooperates for raw material, the moment reaction is worked continuously, realize the production dynamic management, optimum combination, and reduce and drop into, simplify technology, energy-saving and cost-reducing, make novel process accurately realize not having drying, no returning charge, pollution-free target.

[technical scheme]

It is 90-99.7% that industrial production urea is made concentration, temperature at 130-145 ℃ molten urea solution and Repone K or vitriolate of tartar respectively by the formula for a product design, automatic gauge, add special constant temperature mixing reactor simultaneously, start stirring arm, material moment generation chemical reaction, generate low melting point 95-120 ℃ of stable melting charge slurry of chemical property, when its liquid level reaches the flash mouth, enter storage tank from overflowing, deliver to adjustable granulation dish through shurry pump, and press bank proportion, product particle diameter difference and the technical parameters of having set such as reasonable revolution, according to material segregation mechanism, levelling card and ground angle, rationally delimit feed center drop point, the spray granulating zone forms cloth on the granulation dish, granulation, automatic classification and discharge layout, no returning charge operation on the enforcement dish, cool off to product, metering packing is set the basis, thereby realizes that molten urea solution coproduction urea-base compound fertilizer spray granulating does not have drying, no returning charge, pollution-free technology.

Equally according to above-mentioned material deviation mechanism, according to urea-base compound fertilizer bank proportion, technical parameters such as particle diameter, the rotating cylinder whitewashing grain automatic grader of processing and fabricating, in this machine, once realize the urea-base compound fertilizer spray granulating and automatically classification do not have returning charge.And realize that molten urea solution coproduction urea-base compound fertilizer slip prepares continuously, preparation of powder, spray granulating, cooling, computer on-line Control such as the flow of metering packing process, temperature, pressure, urea-base compound fertilizer production is really done from the urea raw material production, reduce to drop into and simplify technology, utilize the steam waste heat of urea plant to guarantee slip constant temperature, the production of realization coproduction urea-base compound fertilizer does not have drying, no returning charge, pollution-free, accomplished energy-saving and cost-reducing, high yield, low cost, made the neat body of joint process in world's rank of advanced units.

[embodiment]

With embodiment the present invention is described below, but is not restriction the invention protection domain.

Embodiment 1: employing molten urea solution production 35-0-5UNK, total nutrient are 40% urea-base compound fertilizer.With industrial production urine make that concentration is 90%, temperature be 130 ℃ molten urea solution and Repone K by 1: 0.2 proportioning continuously adding be the isothermal reactor of pyrogen with the urea production waste gas residual heat; starting stirring arm reacts both; generating fusing point is 110 ℃ of melting charge slurry; its charge level rises to and flow into storage tank automatically when overflow lip; deliver to adjustable garden dish tablets press with shurry pump; atomize through spiral nozzle; with 4260Kg flow per hour; be sprayed onto and set and ground angle at 45, rotations per minute is 16 rev/mins.On the basic powder of forming by 67.7% crystalline particle urea and 32.3% zeolite powder in the 150mm granulation zone of blanking central point below, implement spray granulating, grow up through spraying repeatedly, boning, because of material segregation and automatic grading, qualified particle is overflowed automatically by the below, enters cooler and drops to normal temperature, again metering packing, just realize not have dry, no returning charge, pollution-free, work continuously and produce 35-0-5UNK, always nutrient is the production of 40% urea-base compound fertilizer.The same molten low melting point slip that above-mentioned isothermal reactor successive reaction is made, be sprayed on the powder of identical proportioning in the rotating cylinder spray granulating automatic grader, can make does not have drying, no returning charge, free of contamination 35-0-5UNK, and total nutrient is 40% urea-base compound fertilizer.

Embodiment 2: adopting concentration is that 99.7% fused solution is produced 15-15-15UNPK, always nutrient is 45% urea composite fertilizer.The concentration that industrial production urea is made is 99.7%, temperature is at 145 ℃ molten urea solution, with the proportioning of Repone K by 1: 0.12, add in the isothermal reactor (is the isothermal reactor of pyrogen by the urea production waste heat) continuously, it is 105 ℃ of melting charge slurry that the startup stirring arm makes its successive reaction make fusing point, the liquid phase charge level rises to overflow lip, enter storage tank from overflowing, deliver to adjustable granulation dish with shurry pump, by spiral nozzle atomizing, be sprayed onto to set with 3807Kg flow per hour and become 46.5 ° of angles with ground, per minute is 17 rev/mins the interior monoammonium phosphate of granulation dish: Repone K: zeolite powder is to implement spray granulating on the basic powder of forming at 300: 210: 80.Because of material segregation effect, make just become that particle enters repeatedly that granulation zone is sprayed, bonding, condensation grow up, by the automatic grader effect, qualified particle overflows from dish below, garden automatically, enter cooler and drop to normal temperature, the metering packing warehouse-in just makes the 15-15-15UNK that is produced by successive reaction, spray granulating, no drying, no returning charge, pollution-free coproduction technique again, and total nutrient is 45% urea-base compound fertilizer.

Equally the above-mentioned molten low melting point slip that makes is sprayed on the basic powder of identical proportioning in the rotating cylinder spray granulating automatic grader, can make the 15-15-15UNPK that successive reaction, spray granulating " three do not have " novel process is produced, total nutrient is 45% urea-base compound fertilizer.

Embodiment 3: adopting concentration is 99.7% molten urea solution, and the total nutrient of production 10-10-10-10 (HA) is 30% humic acid content urea-base compound fertilizer.

It is 99.7% that industrial production urea is made concentration; temperature is that 145 ℃ molten urea solution and vitriolate of tartar adds in the isothermal reactor by 1: 0.105 proportioning continuously; start stirring arm; make fusing point and be 110 ℃ melting charge slurry; take method similarly to Example 2; be sprayed onto spray granulating on the basic powder that humic acids organic phosphatic fertiliser and vitriolate of tartar in granulation of garden dish or rotating cylinder spray granulating automatic grader form at 610: 70, just make 10: 10: 10: 10 (HA), always nutrient is 30% humic acid content urea-base compound fertilizer.

Claims (5)

1. One. fusion-urine urea-base compound fertilizer novel process, it is characterized in that it is 90-99.7% that industrial production urea is made concentration, temperature is 130-145 ℃ molten urea solution and Repone K or a vitriolate of tartar, respectively behind automatic gauge, in 1: the ratio of 0.05-0.27 enters continuously chemical reaction takes place in the constant temperature mixing reactor, generate the stable melting charge slurry of chemical property, in carrying, atomize, be sprayed onto adjustable granulation dish or rotating cylinder spray granulating automatic grader, contain N, K ₂O and additive or contain bonding, reunion, condensation granulating on the basic powder of phosphate fertilizer, potash fertilizer, additive, cool off again, operation such as metering, packing, realized the production method of successive reaction, spray granulating, no drying, no returning charge, free of contamination UNK or UNPK urea-base compound fertilizer.
2. Two. according to claim one, the constant temperature mixing reactor is one and is furnished with automatic gauge, safety insulation, the type that overflows certainly, and in establish the mixing reactor that whisks slurry.
3. Three. according to claim one, granulation dish or rotating cylinder spray granulating automatic grader are can realize not having returning charge according to material deviation principle, automatically the fractionated prilling granulator.
4. Four. according to claim one, phosphate fertilizer should be general ammonium phosphate, coarse whiting, partially acidulated rock phosphate and humic acids and ground phosphate rock and reacts the organic phosphatic fertiliser that makes.
5. Five. according to claim one, additive should be a zeolite powder, calcium powder or its their mixture.