The manufacturing approach currently used is mainly the neutralization technique, that is, after responding phosphoric acid with potassium hydroxide or potassium bicarbonate and also potassium carbonate, the neutralization solution is concentrated to get rid of insoluble problem through the control of the reaction end point, and then Then it is cooled down and also later on materialized, centrifuged and also dried out to obtain the thing. Nonetheless, due to the fact that phosphoric acid is divided right into hot-process phosphoric acid as well as wet-process phosphoric acid, wet-process phosphoric acid is usually achieved by using phosphate rock and not natural acid according to the principle of creating weak acid from solid acid. The origin is managed filtering after creating calcium sulfate insoluble matter with other aspects such as calcium component.
Nonetheless, because the high quality of phosphate rock will absolutely influence the quality of wet-process phosphoric acid, the premium quality of the phosphoric acid item prepared by wet-process phosphoric acid is unsteady. At the same time, the contamination product in the obtained phosphoric acid is greater and the pureness is decreased, making When utilizing phosphoric acid prepared by wet-process phosphoric acid to produce potassium phosphate products, it will not simply make the pureness of potassium phosphate salt lower and additionally the excellent quality unpredictable, but additionally create the enhancement of potassium hydroxide or potassium carbonate, Potassium ions in potassium bicarbonate respond with various other pollutant parts to develop insoluble issue, which ultimately creates waste of potassium ions, creating elevated addition of potassium hydroxide, potassium carbonate or potassium bicarbonate, leading to greater preparation prices as well as additionally greater source use.
Accomplish research study on the basis of existing Potassium Phosphate preparation modern technology, provide a kind of wet-process phosphoric acid prep work Potassium Phosphate technique, consist of the sticking to steps:
( 1) obtain the wet-process phosphoric acid that phosphorus pentoxide emphasis is 15%, by reviewing the web content of sulfate radical where, in addition to consist of phosphate rock powder in which, the add-on of phosphorus rock powder is that the mass percentage with the material of sulfate radical is 1:1, after it reacts for half a hr, add ammonia water or feed ammonia gas therein, adjust the pH worth to 3, filter to obtain slurry as well as filter down payment;
( 2) Get Potassium Hydroxide, Potassium Hydroxide is taken part in the slip, the mol proportion of the amount of phosphorus pentoxide in the add-on of taking care of Potassium Hydroxide along with wet-process phosphoric acid is 6:1, after its feeding usage is finished, Manage the adverse tension to 0 MPa, as well as take advantage of a temperature level of 85 ° C to vaporize as well as also form. After a great deal of crystals appear in the option, stop the evaporation, stylish to space temperature, and also filter to acquire the mom alcohol and additionally main product; tidy the key item to obtain Potassium Phosphate.
The Potassium Phosphate has a pureness of 98.1%. For the cleaning, the cleaning fluid generated by washing is returned to step 1 and likewise incorporated with wet-process phosphoric acid. For the evaporative condensation, the gas created throughout the crystallization process is taken in by weaken phosphoric acid, and return to mix with the wet-process phosphoric acid symphonious 1. Described deteriorate phosphoric acid has a concentration of 15%. The mommy alcohol is sent out to the substance fertilizer assembly line; the filter residue is sent to the material fertilizer production line. The potassium hydroxide is included as a strong right into the slurry. The web content of phosphorus pentoxide in the phosphate rock powder is not less than 7%. The phosphate rock powder has a particle size of 40 mesh.