SU697487A1 - Method of producing complex fertilizer - Google Patents

Description

(54) METHOD OF OBTAINING COMPLEX FERTILIZER

PjOs in water insoluble compounds. When this method is processed, raw materials containing 20.5% P2O5 and 7.7% MgO, with the degree of transition of magnesium compounds into the liquid phase by 80%, in the finished product 2/3 of phosphoric anhydride will be bound in the form of water-insoluble magnesium phosphates. Therefore, in the final product only 30% is in water-soluble form.

The aim of the invention is to improve the quality of the product by increasing the content of the water-soluble form of PaOs and improving the filtration properties of calcium sulfate.

The goal is achieved by the fact that in the method of obtaining complex fertilizer, including the decomposition of carbonate-containing phosphate raw material with a mixture of nitric and phosphoric acids, followed by separation of kalvd sulfate, filtration and ammoniation of the filtered solution, decomposition of the acid mixture is carried out in an amount of 100-200% of the stoichiometric norm for decomposition of the carbonate part the raw material and the obtained pulp are ammoniated before the release of calcium sulfate to a pH of 1.5-4.8.

The finished product, due to the removal of magnesium ions from the process, contains 90-96% of phosphoric anhydride in water-soluble form versus 30% by a known method.

The raw material used is phosphorite of the Khubsugulskoye deposit of the following composition, wt%: PjOs 20.5, CaO 40.5, MgO 7.2, COg 17.0, RegOz 0.9, 0.1, F 1.43, n / about 10.2

Example 1. 100 weight.h. phosphorite is treated with 160 weight.h. mixtures of acids (20% NYOZ and 12.0% PjOs) taken in the amount of 100% of stoichiometric decomposition of carbonates at TeNfflepaType 60 ° С in 30 minutes. Dolomite decomposes completely and at the same time 17 weight parts are released into the gas phase. COA, 243 weight.h. pulp treated with 8 weight.h. ammonia gas to PH 1.5 at a temperature in the presence of 200 parts by weight solution (part of the liquid phase from the filtration of the pulp after ammonia). 451 weight.h. pulps are separated on a filter. The precipitate is washed with 35 weight.h. water. 343 weight.h. the filtrate, which is a solution of 1 waste of magnesium and ammonium nitrate, is divided into three streams. 200 weight.h. sent to the stage of ammonization with a nitrogen phosphate stretch, 18.3 parts by weight. added to the solution entering the phosphorite decomposition stage, and 121.7 parts by weight. Is suitable for processing into fertilizer or for extracting magnesium in the form of three or other compounds. Sediment in the amount of 143 weight.h. Treat at 60 ° C for 30 minutes. .116 weight.h. 56% nitric acid and 76 weight.h. ; 93% H2SO4, diluted with 80 parts by weight polluted waters. Pulp in the amount of 415 NES.H. separated on a filter. The amount of dry ground 1 of this sludge is 1500.

The precipitate is washed with 80 weight.h. in / Uii and in the amount of 120 weight.h..thrown into the dump. The liquid phase 295 weight.h. divided into two streams. 138.7 138.7 weight.h. 21.3 parts by weight are combined. after separation of the precipitate in the first stage and fed to the decomposition of phosphorite, another stream in the amount of 156.3 parts by weight sent for subsequent ammonization to a pH of 1.5 to 14 parts by weight. gaseous amltiac. 170.3 paddle pulp evaporated. With 72.8 weight.h. water is evaporated, and 97.5 parts by weight. pulp mixed S 32,5 weight.h. potassium chloride (60% KAO) and substantial. When removing from 130 weight.h. pulp 15 weight.h. water forms 115 weight.h. finished product composition N:: K20 17:17:17 nutrients. Nitrophoska contains 90% of water-soluble phosphates.

PRI mme R 2. 100 weight.h. phosphorite is processed 240 weight.h. mixtures of acids (20% HNOj and 12% P2Os) - 150% of the stoichiometric amount for the decomposition of carbonates. With this in. 17 weight parts of gas are released. Soz, 323 wt. The pulp is treated with 10 parts by weight. ammonia gas to PH 3.0 at 80 ° C in the presence of 120 parts by weight solution (part of the liquid phase of the filtration pulp after ammonia). 453 weight.h. pulps are separated on a filter. The baking tank is washed with 35 parts by weight. water, 345 weight.h. the filtrate, which is a solution of magnesium nitrate and ammonium nitrate, is divided into three streams of 120 parts by weight. sent to the stage of ammonization with a nitrogen phosphate stretch, 101.3 parts by weight. 123.7 parts by weight are added to the solution entering the phosphorite decomposition stage. Expand DPG processing into fertilizer or to extract magnesium in the form of certain compounds. Sediment in the amount of 143 weight.h. processed into the finished product according to the technology described in example 1. Removal of dry washed sludge of kalid sulfate will be 2000. The content of water-soluble phosphates in a nitroammophos will be 96%.

Claims (2)

Example 3. 100 weight.h. phosphorite is processed 320 weight.h. a solution (2514 parts by weight of the filtrate from the stage of separation of sulfate CALSch1 and 68.66 parts by weight of the filtrate after ammonization) containing ammonium nitrate, magnesium and phosphoric acid (10% PjOs, 20% NH4N03 and 2% MgO) at 60 ° s After removal of the P weight.h. COj 403 weight.h. pulp is fed to the ammonization of 10 weight.h. ammonia gas to PH 4.8 in the presence of 131.4 parts by weight solution (liquid phase filtration of the pulp after ammonization). 544.4 parts by weight pulps are separated on a filter. The precipitate is washed 35 ths. water. The filtrate, in a batte of 436.4 parts by weight, containing mapate nitrate and ammonium nitrate, is separated in a sodium stream. 58.6 weight.h. to the stage of decomposition of phosphate, 131.4 parts by weight at the stage of ammovisation of nitrogen-phosphate stretch, 236.4 wt. These plants are suitable for processing into fertilizers or for the production of magic containing products. Sediment in the amount of 143 weight.h. j 116 weight.h. 56% HNOs For the decomposition of phosphorite and dissolution of dicalcium phosphate. Calcium ions are bound to calcium sulfate dihydrate, 326 parts by weight. 40% ammonium sulfate solution in the presence of 100 parts by weight phosphogypsum filtration water. Decomposition is carried out at 60 ° C for 60 minutes. Phosphogypsum is separated by filtration from pulp in the amount of 685 parts by weight. The precipitate is washed with 100 weight.h. water and dumped in an amount of 150 weight.h. 535 weight.h. the filtrate is divided into two streams: 251.4 weight parts. sent to the stage of decomposition of phosphate, and 283.6 parts by weight. output as intermediate (mixture of phosphoric acid and ammonium nitrate). After neutralization of 283.6 weight.h. nitrogen phosphorus solution 9 weight.h. ammonia gas obtained 292.6 wt.h. pulp evaporated with the removal of 195.6 weight.h. water. One stripped pulp in the amount of 97 parts by weight. mixed with 32.5 parts by weight K C (60% K20) and a mixture of 129.5 parts by weight enters the drying drum. In this case, 14.5 parts by weight are evaporated. water and 115 weight.h. the finished product is sent for classification. N: P20s: KjO 1: 1; 1 nitrophosphate has the same composition and quality as the product in Example 1. Claims and ammoniation of the filtered solution, characterized in that, in order to improve the filtration of calcium sulphate and increase the content of water-soluble PZOS, the acid mixture is decomposed in an amount of 100-200% of the stoichiometric rate Part sf voltage carbonate and the resulting calcium sulphate pulp before vvdeleniem ammoniziruyut to pH 1,5-4,8. Sources of information taken into account during the examination 1.Pozin ME, Mineral salt technologists, vol. 2, L., Khimi, 1974, p. 1307-1358. 2.Sb. New research on the technology of mineral fertilizers M., Himi, p. 79-82 (prototype).