SU893983A1

SU893983A1 - Method of producing fertilizer

Info

Publication number: SU893983A1
Application number: SU802915224A
Authority: SU
Inventors: Тамара Ивановна Завертяева; Василий Михайлович Борисов; Михаил Васильевич Лыков; Маргарита Петровна Чамова
Original assignee: Предприятие П/Я В-8830
Priority date: 1980-04-25
Filing date: 1980-04-25
Publication date: 1981-12-30

Description

(54) СПОСОБ ПОЛУЧЕНИЯ УДОБРЕНИЯ(54) METHOD OF OBTAINING FERTILIZER

1one

Изобретение относитс к способу получени удобрени , содержащего фосфор и азот, широко используемого в сельском хоз йстве.This invention relates to a method for producing fertilizer containing phosphorus and nitrogen, which is widely used in agriculture.

Известен способ получени удобрени путем смешивани фосфорита со смесью серной кислоты и сульфата аммони при их соотношении 3:1 и последующего прокаливани при 350-500°С ГП.A known method of producing fertilizer is by mixing phosphate with a mixture of sulfuric acid and ammonium sulfate at a ratio of 3: 1 and subsequent calcination at 350-500 ° C HP.

Однако данный способ требует большого расхода серной кислоты.However, this method requires a large consumption of sulfuric acid.

Наиболее близким к предлагаемому по технической сущности и достигаемому результату вл етс другой известный способ получени удобрени , включающий смешивание фосфорита с сульфатом аммони и прокаливание смеси при 350-500С. При этом сульфат аммони берут в количестве 140-190% от стехиометрической нормы на окись кальци ZJ .Closest to the proposed technical essence and the achieved result is another well-known method of producing fertilizer, including mixing phosphate with ammonium sulfate and calcining the mixture at 350-500 ° C. In this case, ammonium sulfate is taken in the amount of 140-190% of the stoichiometric norm for calcium oxide ZJ.

Недостатком данного способа в л етс получение продукта с низКИМ содержанием усво емой формы (8,8-9,8%), a также сложность процесса за счет необходимости тщательного смешени сухих компонентов .The disadvantage of this method is the production of a product with a low content of digestible form (8.8-9.8%), as well as the complexity of the process due to the need for thorough mixing of the dry components.

Цель изобретени - повышение усво емой формы в продукте и упрощение процесса.The purpose of the invention is to increase the available form in the product and simplify the process.

10ten

Поставленна цель достигаетс тем, что фосфорит смешивают с раствором сульфата аммони концентрацией 25-70%, полученную суспензию сушат при температуре отход ts щих газов 90-200 с до содержани влаги 0,1-10% и затем прокаливают при ЗЗО-ЗОО С.The goal is achieved by the fact that phosphorite is mixed with ammonium sulphate solution with a concentration of 25-70%, the resulting suspension is dried at an exhaust temperature of 90–200 s to a moisture content of 0.1–10% and then calcined at ZZO-ZOO C.

Целесообразность выбранных условий определ етс следующим.The appropriateness of the chosen conditions is determined as follows.

2020

Claims

When working with an ammonium sulfate solution with a concentration of less than 25%, a large amount of moisture will be removed, which is not economically feasible; when working with an ammonium sulfate solution with a concentration of more than 70%, an uneven mixing of reagents occurs and the product has a variable composition. When drying the suspension at the temperature of the exhaust gases below, the process proceeds very slowly and it is possible that the suspension will not dry out; at the temperature of the exhaust gases, the ammonium sulfate partially decomposes. When the suspension is dried to a moisture content of more than 10%, the material becomes hardly transportable, and drying the suspension to a moisture content of less than 0.1% also leads to a significant decomposition of ammonium oulphate. Example 1. 1 ton of phosphorite, for example, the Kingisepp deposit, is mixed with ammonium sulphate solution with a concentration of 25% (100% of the stoichiometric rate) and 5, tons of suspension are obtained, which are dried at a temperature of 200% waste gases to a content of 0.1%. The semi-products in the amount of 2.05 tons are calcined for 2 hours and 2.00 products are obtained with a content of 12.2%% 05 C Example 2. 1t of phosphate is mixed with an ammonium sulfate solution with a concentration of 70% (140% of the stoichiometric standard) and 2.48 suspensions are obtained, which are dried at a flue gas temperature of 90 ° C to a moisture content of 10%. Semi-products in the amount of 2.23 tons are calcined for 1 hour and 1.9 products are obtained with a content of 12, Ch.5X. Example 3. 1 ton of phosphate is mixed with ammonium sulfate solution 34 at a concentration of 50% (120% of the stekiometric standard) and receive 2.07 tons of suspension, which is dried at a temperature of exhaust gases to a moisture content of 5%. An intermediate product in the amount of 2.09 tons is calcined for 1.5 hours and 1.63 tons of product are obtained with a content of 16.0% 16, 0% P OS Use of the proposed method allows to obtain a product with an Ilj rvce content of 12.2-16%, greatly simplify the node cm Reagent solutions, liquidate mills for grinding ammonium sulphate. In addition, the proposed method allows this type of fertilizer to be obtained from low-quality phosphorites. Claims of Invention A method of producing a fertilizer comprising mixing phosphate with ammonium sulfate followed by calcining the mixture at 350-500 0, characterized in that, in order to increase the digestible form P (0 in the product and simplify the process, ammonium sulfate is introduced as a solution by concentration 25-7.0%, the resulting suspension is dried at a flue gas temperature of 90-200 C to a moisture content of 0.1-10%. Sources of information taken into account in the examination 1.My.Dykanbayev, A.Tikhonov V. Khimi and technology of mineral fertilizers and natural salts, t. X, Alma-Ata, 1964, 175,

2. Patent of the GDR No. 7413, Cl05V 1/02 1954 (prototype).