SU973515A1 - Process for producing double ammonized superphosphate - Google Patents

Description

In this case, the fluorine-containing additive is introduced in the amount of 5-15% by weight of the phosphate raw material.

Amount of phosphates and ammonium silicafluoride is higher than the ratio P505: NH4HS I Fg: H2StF 9.4j Molar Degree of decomposition of phosphate raw material

11.0: 1.0 reduces the degree of decomposition of phosphate raw materials, and a decrease in this ratio below 2.2: 1.2: 1.0 increases the free acidity of the product and impairs its physical properties, which is confirmed by the data given in the table. additive ratio

Ra "5

2.0 2.2 4.3 9.4 9.7

Thus, as a result of the implementation of this method, the degree of decomposition of the phosphate raw material rises to 1.053-1.124, which leads to an increase in the content of digestible phosphate.

in the product to 46.7-47%.

Example 1. 100.0 MAH. phosphate decompose 164.6 May, h. phosphoric acid with a concentration of 52% with the addition of 0.6 wt.h. hydrofluoric acid; 1.9 ma.ch. creamy ammonium, 3.4 MAH. calcium phosphates in 81.3 wt.h.-water. The total amount of the additive is 5.9 mash. 345.8 ma.h. pulp, which is granulated and dried. .

Fluorine-containing gases from the drying apparatus are cleaned in the aborption circuit with the formation of hydrofluoric acid. 236.9 ma.ch. double superphosphate neutralize 1.6 mach. ammonia. Unreacted ammonia is captured in the silicon absorption system using hydrofluoric and hydrogen mixture, which is used for absorption of drying apparatus, and Hain is used to decompose phosphate. There are no sinks and losses of PjOj to the neutralization station from absorption systems. Receive 238.3 ma.ch. double superphosphate. The content of digestible PaOj is 47.0%, and ammonia 0.7%. Losses of P2O5 are reduced by 1.5% (by weight of phosphate).

Example 2. 100.0 MAH. phosphate decompose 164.6 ma.ch.

HjS-iF

,

1 1 1 1 1

1.0

1.2

6.8

11.0

11.4

0 phosphoric acid (52% RdO) with the addition of 1.6 wt.h. fluorosilicic acid, 2.8 wt.h. ammonium fluoride, 10.4 wt.h. calcium phosphate at 72.4 wt.h. water. The total amount of the additive is 14.8 mas. Get 345,8 wt.h. pulp, which is granulated and dried. Fluorine gases from the drying apparatus are caught in the absorption system with the formation of silicon fluoride-hydrofluoric acid.

245.3 wt.h. dry double superphosphate ammoniated 2.3 wt.h. ammonia. Unresolved ammonia

captured in a silicon absorption network by hydrofluoric acid and sent to the decomposition of phosphate. Receive 247.3 wt.h. finished double superphosphate. Content digestible

P-jOj is 46.7%, and ammonia is 0.9%. Losses of P205 are reduced by 4.6% (by weight of phosphate).

Claims (2)

Invention Formula , 1. A method of producing double ammoniated superphosphate by decomposing a phosphate feedstock with phosphorus nicotite in the presence of a fluorine-containing additive, followed by granulating, drying and neutralizing the product, characterized in 65 in order to increase the degree 5973515 " decomposition of phosphate raw materials, in ka-sources of information, ChesTve supplements use a mixture of phos- (taken into account during the examination {calcium fata, ammonium silicofluoride fc of hydrofluoric acid, i. Sokolovsky, A.A., Yashke E., at the molar ratio of X-ray diffraction, mineral fertilizer technology and NH4HSiFfc: H2SiFe 2.2-9.4: 1.2-11.0: 1.0..5 acids. M., Himi, 1971, p. 334-341. 2. The method according to claim 1, about t l and h and y -. . u and with the fact that fluorine-containing2. USSR author's certificate the additive is introduced in the amount of 5-15% from 594090, cl. From 05 to 1/04, 05.16.75 weight of phosphate raw materials. (prototype).