SU850636A1 - Method of producing complex fertilizer - Google Patents

Description

Isofetenenne refers to the production of complex deposits and can be used to produce complex fertilizers based on the decomposition of phosphorus-free nitric acid and sulfuric acid. There is a known method of learning the complex of udofeni, which includes the following stages: decomposition of phosphate ore with nitric acid; addition with magnesium, neutralization of potassium sony. | continued neutralization of the resulting mixture to a pH of 7.5 with the simultaneous addition of ammonia and carbon dioxide to a pH of 8.5j increase of carbon dioxide to 3.5% ft. The closest to the proposed iso feteniyu is azotnosernszhyslotny process for preparing complex udofeny comprising decomposition fosfagnogo feed mixture of nitric and sernsy acids keytralv zapsho pulp ammonia poluchennsL, the addition of potassium salts, drying H granulation finished product with the introduction into the pulp it ammonizakiey magnesium preventing regrogradadgayu salts The disadvantage of supplying magnesium salts to the stage of decomposition of phosphate with mineral acids is the bonding of a part of the sulfuric acid with magnesium ions and reducing Consequently, the rate and degree of decomposition of phosphorus-containing minerals. In addition, when magnesium salts are supplied to the stage, magnesium sulfate is decomposed. Additional sulfuric acid is expended on this, resulting in a large amount of calcium ions remaining in the decomposition stage, which are not bound by sulfuric acid. Calcium ions that are not precipitated bind to dipotassium phosphate during ammonization, i.e. retrogradation occurs. PjOj-a water-insoluble. After all remaining calcium ions, as dicalcate phosphate, are precipitated into the solid phase, the phosphate acid, monoammonium phosphate and magnesium sulfate remain in the liquid phase. Gfich, the latter does not form a buffer of creqpOB with phosphoric acid buffer, and the ionic ion of IV – NCA is associated with soo Gefat-. and not with phosphag-konsda h. As a result; For the sake of sulphage, and Magka yri is insignificant to the amount of ammonia in the ammonia supply, the pH value of the aulagy fluctuates sharply (UFU-Hyur, by the heart rate of Acne emulsion, for example, for ammonia supply per 1%% year the pH is 2-2.5 units ЕЕ1Улы). A sharp increase in the pH of the pulp due to minor fluctuations in the flow rate of ammonia makes it difficult to maintain an optimal technological regime and is responsible for the amount of non-stable composition. The KSL product has a lower thermal resistance and in the neuralgated product it is important that P Op is reduced to water-insoluble compounds. According to this feature, sulfuric acid is introduced into the process with some excess, and its partial binding is absorbed into magnesium sulfate. The purpose of the invention is to reduce the consumption of sulfuric acid and stabilize the technological and ammonium reforming process. The solution is achieved by the fact that the magnesium solics are introduced into the mixture simultaneously with ammonia for the neutralization stage in the mass co-skewed NH, 1, 5, O; When the magnesium salts are added to the process along with ammonia, the sulfuric acid reacts at the decomposition stage only with phosphate 5M raw material (this reduces its consumption as the formation of magnesium sulfate is formed at the decomposition stage of the raw material in a known way), and the mixed FIPI interact, then, after the recovery stage It doesn’t contain her Fat-HCHOBj rolls and is bound to form magnesium fossrate. Magnesium phosphate gives puffer cBoficTBa buffers and stabilizes the irodess of ammoniations. . When the ratio MgO is lower ifO: 2, C, the solubility of calcium sulfate on the solid phase of the pulp increases in water. As a result, in the process of daily ammonization of njetbtibi content in the solution, the nyas each enter into the graduated phase in the form of dicapyiiphosphate and thus lower the content of soaopiacy-BqpHMbix forms of phosphate B. Fertilizer. With the corresponding -fAgO. More than 1.0: 5.0 in the pulp does not occur. Extention of magnesium salts in $ corresponding to HOs excludes the formation of phosphate of magnesium stabilization of the nitrogenous process of ammonia (zhaza 64 1 p and mor 1 "On decomposition of 1OO weight. Acids and 3.1 ppm of sulfuric acid (total in the process is used with sulfuric acid metering applied to the ammonium stage in 57 weight parts of the DNZO. There are ammoniated 27 weights of ammonia gas with the simultaneous supply of magnesite to the initial stage of ammonization in the ammonium stage. Amount 3 VECOCO B At the end of ammonization, 66 ve Sulfuric potassium is sent to the pulp for drying. The resulting product (nct) fully complies with the requirements of GOST 11365-75. In case magnesite is supplied to the apatite supply stage with nitric acid and serum acid, it is necessary to spend 64 parts by weight of sulfuric acid {38 parts by weight, to the stage of decomposition of apatite and 26 parts by weight to the stage of ammonization). Thus, when magnesite is fed according to the proposed method, the consumption of sulfuric acid is reduced by 7 weight, h. ,those. 11% of its total amount. PRI me R 2, 82 parts by weight are supplied to the decomposition of 1HE VOCOSH, apatite. Nitrogen and 31 VOCs of the sulfuric acid magnesite is introduced into the ammonization stage with a pH of n / a equal to 2.0. The amount of ammonia fed to ammonia varies from 25s2 pbw, to 27 pbw weight. by 7%. The pH value of the pulp for such fluctuations in the flow rate of ammonia varies from DB to 5.2. In the case of feeding magnesite to the stage of acid decomposition of apatite, t, e, by a known method, a similar change in ammonia consumption results in a change in pH from 3.80 to 4.84. Thus, the supply of magnesite according to the proposed method allows stabilizing the process mode of ammonization while reducing the descent of sulfuric acid. The formula of the invented method of obtaining a complex fertilizer includes the decomposition of phosphate raw material with a mixture of nitric sulfuric acid, the addition of magnesium salts, the neutralization of scientifed pulp with ammonia, the addition of potassium salts, drying and granulation of protozoan 6

a duct, differing in hem, that, Istnnki nnformatsnk,

in order to reduce the consumption of chokeberry sour-taken into account during the examination

lots and stabilization of technological re-1. U.S. Patent M 2,84534 O,

Press Ams izatseni, Magnesium Solv enter tkl. 71-39, 1954.

into the pulp simultaneously with ammonia on the sta- s2 MN Nabiyev Aeo-acid acid neutralization in the mass-ratio of phosphates. Tashkent, Fan, 1976,

SRI Mg-O: NH “l, O: 2.0-5, O.tL, p. 242-244 (prototype). .

Claims (1)

Claim A method of producing complex fertilizer, including the decomposition of phosphate raw materials with a mixture of nitric and sulfuric acids, the addition of magnesium salts, the neutralization of the resulting pulp with ammonia, the addition of potassium salts, drying and granulation 5 650636 product, characterized in that, in order to reduce the consumption of a series of acids and stabilize the technological mode of ammonization, magnesium salts are introduced into the pulp simultaneously with ammonia for 5 days of neutralization in a mass ratio of Mg O '. NH $ - 1.0: 2.0-5.0.