Method to produce nitrogen-sulfate fertiliser
SUBSTANCE: method includes mixing solutions of ammonium nitrate and sulfate at the ratio that provides for the specified content of sulfate sulphur in a fertiliser, introduction of a modifying additive, steaming of the mixed solution at the finished temperature of the produced suspension that does not exceed 155°C, granulation of suspension. The suspension prior to granulation is soaked during mixing for at least 30 minutes and steamed at the finished temperature of 186-198°C. Granulation is carried out by prilling method.
EFFECT: invention makes it possible to produce a fertiliser that does not become caked when stored even without treatment of granules with amino-oil mix.
4 cl, 1 ex
The invention relates to methods for fertilizers containing nitrogen and sulfate sulfur, based on nitrate and ammonium sulfate and can be used in the chemical industry for the production of fertilizer type NS.
In agriculture, more and more applications are complex fertilizers based on ammonium nitrate, optionally containing sulphur compounds.
The growing interest of agricultural producers to the sulfur as an element of power plants is determined by a number of reasons: the decrease in the soil, increased production and consumption of free or low sulfur fertilizers and increased its removal from the soil in connection with the systematic growth of crops.
A known method of producing fertilizer containing nitrogen and sulfate sulfur, by neutralizing nitric acid with the addition of sulfuric acid with ammonia, parki neutralized solution with subsequent granulation of the target product [Production of ammonium nitrate in units of great power. Edited Vmelilo, 2nd edition. Chemistry, 1990, s-162]. The disadvantage of this method is to obtain a product with low content of sulphate sulphur: 0.1 to 0.15 wt.% or of 0.4-0.6 wt.% in terms of ammonium sulfate.
A method of obtaining attacullaculla fertilizers, including the preparation of an aqueous pulp the humidity 7÷15 wt.% and a temperature of 80÷100°C, containing ammonium nitrate and ammonium sulfate, with subsequent granulation drum granulator-dryer [U.S. Pat. Of the Russian Federation No. 2227792, IPC 7 SS 1/00, C05G/00, publ. 27.04.2004, bull. No. 12]. The disadvantage of this method is low consumer properties of produced fertilizers due to a mismatch of particle size distribution the requirements of modern consumers and the low strength of the granules.
The closest to the essential features and the result achieved by the claimed technical solution is a method for attacullaculla fertilizer, which is mixed solutions of nitrate and ammonium sulfate in a ratio that provides the content of sulphate sulphur in the fertilizer within the specified limits, enter the modifier phosphate additive mixed solution evaporated at finite temperature the resulting suspension within 142÷155°C, the suspension granularit in a drum granulator-dryer [U.S. Pat. Of the Russian Federation No. 2344112, IPC 7 SS 1/00, publ. 20.01.2009].
The disadvantage of this method is unsatisfactory consumer properties of produced fertilizers. They become compressed during storage despite the use of phosphate builders. Introduction known magnesia additive or additives of aluminum sulfate also does not remove the seal of the product during storage. Caking Astronautical by additional processing of the granules amino-oil mixture. However, this significantly reduces the stability of fertilizers against detonation, i.e. makes them explosive.
Probable cause poor consumer properties is as follows.
From the scientific literature it is known that one of the main conditions for obtaining this type of fertilizer with high physical-mechanical and physical-chemical indicators is ensuring the fullest possible formation of structures of double salts 2NH4NO3·(NH4)2SO4and 3NH4NO3·(NH4)2SO4.
With regard to fertilizer with a relatively low content of sulphate sulphur (up to 8 wt.%) optimal is a two-component system consisting of double salts and ammonium nitrate. All the ammonium sulfate used for producing fertilizer, should be part of the double salts, i.e. in free form as a third phase should be absent.
Upon receipt attacullaculla fertilizer according to the method, apparently because of the low rate of structure formation of double salts of the above-described condition is not realized, which leads to the deterioration of consumer properties of the fertilizer.
The technical task of the present invention to provide a fertilizer, not caking during storage even without treatment granules amino is Aslani mixture, i.e. improvement of consumer properties.
This object is achieved in that in the method of obtaining attacullaculla fertilizer comprising mixing solutions of nitrate and ammonium sulfate in a ratio that provides the specified content of sulfate sulfur in the fertilizer, the introduction of modifying additives, oparka mixed solution at finite temperature the resulting suspension is not higher than 155°C., the granulating suspension according to the invention, the suspension before granulation is maintained with stirring for at least 30 minutes and darpariaeth at finite temperature 186-198°C.
The suspension before granulation is preferably maintained with stirring for 40-120 minutes.
The final temperature when dopravni suspension is preferably maintained within the range of 190-195°C.
The granulating suspension exercise method pilirani.
Mix 35÷90% (hereinafter,% mass) solution of ammonium nitrate and 40÷45%solution of ammonium sulfate mass ratio, providing the content of sulphate sulphur in the resulting fertilizer 3, 5 and 7%, enter the modifier additive from among known (phosphate, magnesium, aluminum sulfate) in an amount of 0.2÷0.4% of MgO or 0,3÷0,6% P2O5or 0,3÷0,5% Al2O3in the fertilizer, the mixed solution is evaporated at finite temperature is E. the resulting suspension 140÷150°C, one stripped off, the suspension is incubated under stirring for at least 30 minutes, optimally 40÷120 minutes, and darpariaeth at finite temperature the suspension 186÷198°C, preferably 190÷195°C.
Doverennyy suspension granularit method pilirani in Grand tower.
Get fertilizer grades 33:3, 32:5 and 30:6. Fertilizer storage is not compressed, requires processing unit aminobutyric mixture, which is confirmed by three independent tests:
- full-scale tests received fertilizer in stock - experienced party retained friability for at least 6 months;
- definition of a shortening according to GOST 21560.5 (friability 100%);
laboratory test, in accordance with which the sample is placed in a cylindrical shape, stand under a load of 0.5 kg/cm2within 7 days with subsequent determination of effort to break pressed briquettes. Sample after 7-day exposure were scattered in the disclosure form (pressure gap less than 0.1 kg/cm2). According to x-ray analysis fertilizer is a two-component system of ammonium nitrate and double salts, crystalline phase of ammonium sulfate is absent.
All experimental batches of fertilizer stand the test of resistance to detonation by the method specified in the Regulation (EC) No. 2003/2003 of the European Parliament and of the Council of 13.10.200.
Thus, the proposed method allows to solve the technical problem.
The positive effect is caused, apparently, by the fact that the alleged distinguishing features together provide optimal conditions for bottom-up structure formation of double salts.
Extract with stirring suspension formed by evaporation, for at least 30 minutes ensures the completion of the crystallization drop-down solid phase structure.
The optimal exposure time is 40÷120 minutes, while the upper limit is determined by economic considerations.
Dopirovanie suspensions at finite temperature 186÷198°C provides a comprehensive structure formation of double salts on the stage of granulation.
The optimum temperature range when dopravni is 190÷195°C.
1. The method of obtaining attacullaculla fertilizer comprising mixing solutions of nitrate and ammonium sulfate in a ratio that provides the specified content of sulfate sulfur in the fertilizer, the introduction of modifying additives, oparka mixed solution at finite temperature the resulting suspension is not higher than 155°C., the granulating suspension, wherein the suspension before pelleting stand under stirring for at least 30 min and darpariaeth prionace temperature 186÷198°C.
2. The method according to claim 1, characterized in that the suspension before granulation is preferably maintained with stirring for 40÷120 minutes
3. The method according to claim 1, characterized in that the end temperature of the suspension is maintained within the range of 190 to 195°C.
4. The method according to claim 1, characterized in that the granulation is conducted by the method of pilirani.
SUBSTANCE: present invention relates to vermiculite based adsorbents. Untreated vermiculite is heated at temperature at which the third vermiculite decomposition step takes place. Heating is carried out to temperature at which interplane distance of vermiculite Cd002 is equal to 9.9-12 A. The invention discloses use of the obtained vermiculite as an absorbent material, as well as soil fertiliser/conditioner.
EFFECT: invention increases ammonia sorption capacity of vermiculite.
12 cl, 2 dwg, 6 tbl, 3 ex
SUBSTANCE: proposed universal fertiliser consists of ammonia water, superphosphate, clay slates, and also additionally contains ammonium sulfate at the following ratio of ingredients in % of weight: Superphosphate 13; Clay slates 33; Ammonia water 33; Ammonium sulfate 21.
EFFECT: this ratio of ingredients increases efficiency of proposed universal fertiliser and makes it possible to improve productivity of useful crops.
FIELD: sulfate nitrate compositions used as fertilizers.
SUBSTANCE: proposed ammonium sulfate nitrate composition contains ammonium sulfate and (NH4)2SO4·2 (NH4NO3)salt with at least 5%-mass of more dangerous (NH4)2SO4·3(NH4NO3) salt and ammonium nitrate. Composition is obtained through reaction of ammonium sulfate with ammonium nitrate taken at mole ratio of from 0.9:1 to 1.1:1 in presence of small amount of water within limited temperature range; then, fast cooling is performed for hardening to avoid macroscopic separation of reaction products. Proposed composite material of ammonium sulfate and ammonium nitrate is used as fertilizer.
EFFECT: possibility of obtaining required levels of nitrate ions; high resistance to detonation, high density, high resistance to moisture.
22 cl, 7 dwg, 9 tbl, 4 ex
SUBSTANCE: invention relates to liquid fertiliser compositions having high nitrogen content. Aqueous solution of nitrogen fertiliser contains a mixture of urea-formaldehyde resin and a source of nitrogen fertiliser which is selected from a group consisting of urea, ammonium nitrate and a mixture of urea and ammonium nitrate, and has nitrogen content from 28 to 32 wt %. The urea-formaldehyde resin is obtained from reaction of urea, formaldehyde and ammonia in molar ratio formaldehyde/urea/ammonia equal to 1-4/1/0.5-1. The reaction takes place at temperature ranging from 80°C to 95°C and pH from 7.5 to 10.5. The reaction time ranges from 45 to 120 minutes. The urea-formaldehyde resin has cyclic urea content higher than 40 wt %, free urea less than 10 wt %, per 100% solid substance of the resin.
EFFECT: invention enables to obtain a liquid fertiliser composition with prolonged effect and high nitrogen content, which has a wide temperature range within which it remains liquid without marked precipitation of solid substances.
24 cl, 4 tbl, 5 ex
SUBSTANCE: invention relates to fertiliser compositions containing ammonium nitrate. The fertiliser contains double salts of ammonium nitrate, which have exothermic reaction energy at temperature of approximately 600 K higher than -0.5 kcal/g. The fertiliser can also contain a single salt of ammonium nitrate in amount of 0-1 wt % and one or more double salts of ammonium nitrate. The double salt of ammonium nitrate contains ammonium nitrate and a second compound selected from ammonium phosphate, calcium nitrate, potassium nitrate, magnesium nitrate, ammonium molybdenate, ammonium hexafluorosilicate, and neodymium hydroxynitrate and a combination of two more of said compounds.
EFFECT: invention enables to obtain a fertiliser composition based on ammonium nitrate, having detonation resistance.
14 cl, 3 tbl, 11 ex
SUBSTANCE: invention relates to stabilised or densensitised ammonium nitrate compositions and methods of preparing said compositions. The fertiliser contains ammonium nitrate and a stabiliser selected from a group of deoxidising agents and ammonium-generating reagents. Ammonium nitrate in the fertiliser is present in form of one or more binary salts with a compound selected from ammonium sulphate, ammonium phosphate, calcium nitrate, potassium nitrate, magnesium nitrate, ammonium molybdenate, ammonium hexafluorosilicate, neodymium oxynitrate or combinations of two or more of said compounds. Molar ratio of the compound and ammonium nitrate ranges from 0.5:1 to 2:1 and is calculated as a ratio of the number of moles of the compound to the total number of moles of ammonium nitrate.
EFFECT: invention enables to obtain a fertiliser composition based on ammonium nitrate, having detonation resistance.
19 cl, 4 tbl, 4 ex
SUBSTANCE: ammonium nitrate solution with concentration 90-99.5% is mixed with crushed ammonium sulphate at temperature 120-210°C. Before granulation, one of the following substances is added to the obtained suspension as an additive: boron-containing ore, ammonium sulphate, boric acid, borax, caustic magnesite, iron (III) oxide or a nitrogen-acid extract from caustic magnesite, iron (III) oxide or boron-containing ore in amount of 0.5-2.0 wt % ammonium nitrate. Granulation is carried out by rolling or by crystallising melt droplets in a tower.
EFFECT: method increases statistical strength of granules, ensures high resistance of granules to heating and cooling cycles and prevents segregation of components on the surface of granules.
3 cl, 1 tbl, 40 ex
SUBSTANCE: invention relates to technology of mineral fertiliser and can be used in production of NS double fertiliser based on ammonium nitrate and sulphate. The method of producing ammonium sulphate-nitrate involves neutralisation of nitric and sulphuric acid with ammonia with evaporation of water added with the acids through heat from the neutralisation reaction and then processing the neutralisation products to the end product. Sulphuric acid is first diluted with nitric acid in ratio of sulphuric acid to nitric acid in the range of 0.75-1.45 in terms of 100% acid, and then with water and the obtained sulphuric-nitric acid solution is taken for neutralisation. Water consumption for dilution is kept equal to 0.2-0.5 tons per ton of the end product. The neutralisation product is granulated in granulating drums - driers.
EFFECT: method reduces hygroscopicity of the end product and improves its application properties.
3 cl, 1 ex
SUBSTANCE: ingredients are contained in water solution at the following mole ratio: bivalent metals, such as manganese, zinc, copper, cobalt, magnesium, nickel, iron II: dihydrate of versene equal to 14,8:1. Content of ingredients in 10 l of liquid concentrated solution makes as follows: 10 g of potassium dichromate, 100 g of ferric (II) sulfate, 3 g of nickel sulfate, 600 g of zinc sulfate, 250 g of copper sulfate, 900 g of magnesium sulfate, 40 g of cobalt sulfate, 50 g of ferric (III) chloride, 25 g of lithium chloride, 80 g of ammonium paramolybdate, 60 g of sodium tetraborate, 50 g of boric acid, 3 g of selenium (IV) oxide, 150 g of manganese sulfate, 50 g of urea.
EFFECT: invention allows fulfilling the specified purpose.
3 cl, 1 ex
SUBSTANCE: method involves feeding granulation centres in form of initial granular fertiliser and separate and simultaneous feeding of liquid and solid components which provide the given final composition of the product. The granulation centres used are prilled granules of ammonium nitrate, carbamide, NPK fertiliser. The liquid component used is an aqueous solution at 90-110°C and containing 70-90% ammonium nitrate or carbamide and 0.1-4.5 wt % of one additive selected from: ammonium sulphate, potassium sulphate, caustic magnesite, ammonium phosphate, iron (III) oxide, boric acid. The solid component used is calcium carbonate, magnesium carbonate, potassium sulphate, ammonium phosphate, ammonium sulphate, carbamide, zeolite, magnesium hydroxide. The liquid and solid components are fed into a granulator in ratio necessary for continuous binding of the stream of powder onto the surface of granules and minimum time of contact between the liquid and solid components.
EFFECT: invention enables to obtain fertiliser with high static strength, resistance to heating and cooling and low caking.
4 cl, 5 tbl, 21 ex
SUBSTANCE: method involves ammonation of a mixture of a phosphorus-containing component with ammonium nitrate, evaporation and granulation of the obtained mixture followed by treatment of the granules with an anti-caking substance. The phosphorus-containing component is a clear ammonium phosphate solution with concentration of 16-30% in terms of P2O5, obtained through ammonation of wet-process phosphoric acid to pH 2.2-3.0 and then separation of the precipitate.
EFFECT: invention enables to obtain nitrogen-phosphate fertiliser using existing ammonium nitrate production equipment and protection of equipment and pipes from corrosion and clogging up of equipment and communication.
SUBSTANCE: invention discloses a fertiliser granule which contains ammonium nitrate, having a nucleus which contains at least 80 wt % ammonium nitrate and a coating layer which contains calcium sulphate. Total content of nitrogen in the granule is at least 27 wt % and the coating layer essentially consists of a homogeneous mixture which contains calcium sulphate and ammonium nitrate. The method of obtaining fertiliser granules having nitrogen total content of at least 27 wt % involves bringing a nucleus containing at least 80 wt % ammonium nitrate into contact with an aqueous solution of ammonium nitrate and calcium sulphate particles to obtain a coating layer on the nucleus which essentially contains a homogeneous mixture containing calcium sulphate and ammonium nitrate.
EFFECT: obtaining fertiliser which is safe for storage and use, having high nitrogen content sufficient for mechanical stability and easy use.
31 cl, 2 tbl, 3 ex
SUBSTANCE: invention relates to a composition and a method of producing nitrogen fertiliser based on ammonium nitrate and carbamide and a sulphate additive and can be used in chemical industry for producing a new type of fertiliser known as granular UAN fertiliser. The method involves production of granular nitrogen fertiliser based on ammonium nitrate, carbamide and a sulphate additive whose granules contain an ammonium nitrate nucleus, an outer carbamide shell and an intermediate ammonium sulphate layer. The fertiliser contains 37-41% nitrogen and 1-3% sulphate sulphur. The fertiliser is obtained through successive deposition onto ammonium nitrate granules of an aqueous suspension of ammonium sulphate with simultaneous drying and fusion of carbamide and subsequent cooling of the end product. The amount of deposited ammonium sulphate is kept in the range of 80-210 kg per ton of ammonium nitrate. Concentration of ammonium sulphate in the aqueous suspension is kept in the range of 55-70%. Mass ratio of carbamide to ammonium nitrate in the end product is kept in the range of (0.5-1.5) :1.
EFFECT: more efficient production of nitrogen fertiliser based on ammonium nitrate and carbamide with a sulphate additive.
6 cl, 2 tbl, 1 ex
SUBSTANCE: invention relates to production of compound fertilisers which contain nitrogen, phosphorus, potassium and sulphur and are used in agriculture. The method involves mixing wet-process phosphoric acid with absorptive liquid, step-by-step neutralisation of phosphoric acid and 92-95% sulphuric acid with ammonia while feeding acid separately during the three steps, adding a nitrogen-containing component in form of ammonium sulphate solution to the pulp in an amount necessary for maintaining the volumetric consumption ratio of the solution: phosphoric acid equal to 0.06-0.18:1, granulating and drying the product. At the first step, the mixture of phosphoric acid and absorptive liquid is neutralised to obtain pulp with molar ratio NH3/H3PO4 equal to 0.2-0.5 and density 1.37-1.43 t/m. At the second step, the pulp and sulphuric acid are post-neutralised in the tubular reactor to obtain sulphoammophos pulp with molar ratio NH3/H3PO4 equal to 0.7-0.9. Sulphuric acid is fed in an amount necessary for maintaining the ratio SO3:P2O5 in the sulphoammophos pulp equal to 0.6-2.0:1. At the third step, final neutralisation of the sulphoammophos pulp is carried out in a granulator-ammoniator. During production of NPK fertiliser, potassium chloride is fed into the granulator-ammoniator in amount of 1-20% of the weight of the product in terms of K2O.
EFFECT: invention lowers consumption of sulphuric acid by 4-10%, enables to obtain a wide range of NP and NPK fertilisers with good application properties and having antiseptic properties.
2 cl, 1 tbl, 4 ex
SUBSTANCE: invention pertains to inorganic chemistry which relates to synthesis of mineral fertiliser and specifically to process installations for preparing ammonium sulphate by directly mixing sulphuric acid with ammonia gas. The installation for preparing an ammonium sulphate solution has supply pipes and inlet units for sulphuric acid and ammonia gas, a circulation pump and a collector-container on a suction drum and a heat exchanger. The units for inlet of sulphuric acid and ammonia gas are made in form of two tubular injector mixers inserted into the circulation pipe and connected to the input and output of the heat exchanger. The sulphuric acid and ammonia gas supply pipes are connected to socket pieces for inlet of streams of sulphuric acid and ammonia into the tubular injector mixers.
EFFECT: design of a closed non-waste installation, which prevents emission of the ammonia gas phase into the atmosphere; reduced loss of valuable material; lower capital expenses on construction.
8 cl, 6 dwg