A potassium fluorosilicate/sodium separation device and its application

Abstract

The invention discloses a potassium fluorosilicate / sodium separation device and its application. The separation device is installed at the bottom of the flash cooling slurry return pipe. It includes a separation pipe, and the separation pipe includes an inlet section and an outlet section. A gate valve is installed between the section and the outlet section, and a gate valve is installed at the outlet of the outlet section. A screening device is installed outside the outlet of the outlet section of the separation pipe, and a spray device is arranged between the screening device and the outlet of the separation pipe. The potassium / sodium fluorosilicate separation device provided by the present invention is simple in structure and easy to use. By installing it at the bottom of the flash cooling slurry return pipe, the potassium / sodium fluorosilicate scaling can be effectively separated from the reaction slurry , avoiding the harm caused by the potassium and sodium salt scaling to the reaction tank and pipeline, and improving the production efficiency.

Description

technical field [0001] The invention relates to a separation device and its application, in particular to a potassium fluorosilicate / sodium separation device and its application, and belongs to the technical field of wet-process phosphoric acid production equipment. Background technique [0002] Phosphoric acid is the basic raw material for producing various industrial and agricultural phosphorus products. At present, there are mainly two production processes of phosphoric acid at home and abroad: thermal method and wet method. Compared with the two, the process of wet method phosphoric acid is characterized by relatively low product cost. , but of lower quality. At present, the wet method is mainly used in the preparation of industrial phosphoric acid in the world, and the wet method phosphoric acid is mainly used in the production of agricultural fertilizers in my country. The so-called wet-process phosphoric acid is to use inorganic acid to decompose phosphate rock powde...

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Problems solved by technology

In a small amount, it appears as crystalline powder, which adheres to the inner surface of the pipeline and the container. After a long time, it is easy to block the pipeline and affect the production load; Reduce the stirring intensity, there is a great hidden danger

When the acid hydrolysis slurry is filtered and separated, the water will be vaporized rapidly due to the vacuum effect, and the temperature will drop sharply to 25-30°C, and a hard and dense potassium fluorosilicate / sodium scale layer will be precipitated in the filtration pipeline system, which will block the pipeline and affect the production load , which has become the main process problem in the production of wet-process phosphoric acid from phosphate rock with high potassium and sodium content

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