SU880444A1 - Method of separating non-soluble residues - Google Patents

Description

(54) METHOD OF SEPARATION OF THE SOLUBLE RESIDUE

one

The invention relates to the technology of separating suspended particles from liquids by sedimentation and can be used in the processing of natural raw materials containing large amounts of silicon compounds with mineral acids, in particular in the preparation of complex fertilizers by the decomposition of natural phosphates with nitric acid.

There is a method of separating an insoluble residue obtained by disintegrating natural phosphates with nitric acid using a centrifuge 1.

The disadvantage of using a centrifuge for separating the insoluble residue is a significant lack of solos (55.8%) of the solid phase with the centrifuge.

Yaybie closer to the proposed method to the technical essence and the achieved result is a method of separating the insoluble residue from the solution obtained by the decomposition of the natural phosphate raw material with nitric acid, by the introduction of additives, followed by filtration. According to this method in suspension before. 3–12% of the weight of the suspension 2 is introduced by filtration by filtration.

The disadvantage of this method is the necessity of introducing a large amount of expensive liquid glass and the need for its regeneration, which is very. time consuming process. In addition, the filtration rate at the same time remains relatively low and does not exceed

14.7 10 s.

The purpose of the invention is to intensify the process and simplify it by eliminating the regeneration stage of the used additive.

This goal is achieved by using as an additive polymerized and sodium saponified saponified sulphate from the production of nitrylakoyl acid in an amount of 1 2 - 10 - 3,0 10% of the weight of the suspension being filtered. 2 .10 weight. % filtration rate of the suspension remains low, and the introduction of more than 3.0-10 weight. % is advisable, since the filtration rate is stabilized and no longer increases (see table).

Separation of insoluble residue

on ioutch filter

with the addition of liquid glass

-6

0.2. .ten

5.9. 10 12.1. ten

Claims (1)

Claim The method of separating the insoluble residue from the solution obtained by the decomposition of natural phosphate. raw materials with nitric acid, by introducing additives followed by filtration. her, characterized in that, in order to intensify the process and simplify it by eliminating the stage of regeneration of the used additives, polymerized and saponified sodium hydroxide bottoms of nitriacrylic acid production * are used as additives in the amount 1.2 · 10 ~ * - 3.0 "10% of the weight of the filtered suspension.