CS268589B1 - The method of regenerating the phosphate cat - Google Patents

Abstract

The solution concerns the method of regeneration and full utilization of phosphate sludge as a technological waste for the chelating treatment of the surface of metal phosphating materials containing mainly iron phosphate and possibly sulfur phosphate and/or ferrous phosphate in the air according to the quenching in the basic phosphate feed. The stage was based on the sludge, diluted with water in the air 1 to 0.5 to 0.6, supplemented with technical sulfuric acid with a concentration in the range of 101 to 102 X relative to its theoretical concentration corresponding to the phosphorus content in the sludge, and this was carried out under a constant reaction mixture and heated for an evaporation period of 70 to 75 X volume. After that, the reaction mixture is cooled until the ferric sulfate crystals have formed, and the phosphoric acid filtrate is sucked off and transferred to a reservoir for further use. The phosphoric acid filtrate thickens and replenishes the rest of the phosphatizing agent and is transported to the appliances.

Description

The invention relates to a process for the regeneration of phosphate sludge hired as a technological waste in the chemical surface treatment of metallic materials by phosphating, for example before electrophoretic non-nanopainting varnishes for radiators and solving the problem of full utilization of its components.

Previously used technological processes of phosphate and breast chemical surface of the metal surface provide as technological waste folate sludge consisting mainly of phosphate and iron in water and in insignificant amounts of zinc phosphate, and / or agananate, according to the used folate preparation. The said tusk, as a technological waste in the chemical treatment of metal products, hired vinegar, such as car bodies, thatched panel radiators, etc. send its use to sludge landfills and heaps where it pollutes the environment. Unused phosphating sludge contains very valuable phosphoric acid, which is imported.

Said problem is a method of regenerating phosphate sludge as technological waste according to the present invention. The essence of the invention is that the phosphate sludge, after glazing with water in an amount of 1 to 0.5 to 0.6, was treated with technical acid of a quantity in the range of 101 to 102% by weight relative to its theoretical amount corresponding to the phosphorus content. v kale. The addition of # sulfuric acid is carried out while constantly stirring the reaction mixture and heating it to an evaporation time of 70 to 75% of its volume. The reaction mixture is cooled until ferric sulfate crystals are formed and the phosphoric acid filtrate is filtered off with suction and taken up in a container for pre-use. Preferably, the phosphoric acid filtrate is further concentrated and, after replenishing the other phosphate components, is passed to the appliances.

The main advantage of the process according to the invention is the simple regeneration of phosphoric acid without the high demands on the regeneration device and the saving of this deficient raw material for the preparation of the phosphating salt. It is possible to use technical or otherwise worn kyaeHnu sulfur and, ultimately, to improve the ecological subsoil and experience of the waste product for various uses such as liquid rust removers, solid soil pastes or eco-fertilizer for agricultural purposes.

Example

Phosphate sludge dried at 105 ° C was used. The content of P in the sludge according to the analysis was 15.66 X. From the said sludge was not weighed 300 g in a glass beaker was added 150. . The reaction mixture was then heated to reflux and, occasionally stirred with a glass rod, the mixture was concentrated to 1/4 flood volume. Evaporation of water took place for 1 hour and 40 minutes. After cooling the reaction mixture, the crystallized ferric sulfate was filtered off on a paper filter under vacuum. The obtained ferrous ferric side was used as a basic raw material for Callie use. The filtrate obtained contains phosphoric acid in a yield of 150 g of H 2 PO 4 (98% yield).

Claims (1)

SUBJECT OF EXPRESSION The method of regeneration of phosphate sludge has been hired as a technological waste in the chaotic surface treatment of metallic materials by phosphating · containing predominantly ferric phosphate and possibly zinc phosphate and / or agananate phosphate in proportion to the base load) of the phosphating sludge, characterized by quartz water The ratio of 1 to 0.5 to 0.6 is treated with technical sulfuric acid in an amount ranging from 101 to 102% by weight relative to its theoretical amount corresponding to the phosphorus content of the sludge, stirring the reaction mixture continuously and heating for 70 to 75%. In addition to its volume, the reaction mixture is cooled while the ferric siren crystals are formed and the phosphoric acid filtrate is filtered off with suction.