Process for precipitating sewage in ardealite slag field for sodium fluosilicate production

Abstract

The invention discloses a process for precipitating sewage in an ardealite slag field for sodium fluosilicate production. The process comprises the following steps: S1, conveying ardealite slag slurry generated in phosphoric acid production to the ardealite slag field for stockpiling; s2, in the stockpiling process, the ardealite slag slurry naturally settles under the action of gravity for liquid-solid separation; s3, collecting a liquid phase into a water return pool; s4, returning to a sodium fluosilicate production device for sodium fluosilicate production; s5, after the sewage is naturally settled, the settled sewage in the ardealite slag field is conveyed into a sodium fluosilicate production device, the sewage generated by the sodium fluosilicate production device is returned to the phosphoric acid production device again, and finally water balance is formed. According to the process for precipitating sewage in the ardealite slag field for sodium fluosilicate production, any natural water such as fresh process water and the like is completely replaced and no longer used, qualified recycled water is treated, water is saved, industrial wastewater is reduced, the water storage pressure of the slag field is relieved, water balance in the whole process is adjusted, and the current production and environmental protection requirements are met.

Description

technical field [0001] The invention relates to the technical field of chemical product production technology, in particular to a process for precipitating sewage in a phosphogypsum slag field produced by sodium fluorosilicate. Background technique [0002] In the production of sodium sulphate wet-process sodium fluorosilicate in China, process water or plant-treated water is used as production water for salt dissolution, washing, rinsing, and equipment sealing and cooling. In the traditional way of producing water, a large amount of industrial wastewater will be generated during operation, which will eventually be collected into the slurry water of the phosphoric acid workshop, reducing the consumption of sedimentation sewage in the phosphoric acid workshop, and eventually leading to more and more sedimentation sewage in the slag field, affecting the production water balance of the entire company , resulting in serious production and environmental pollution pressure, unable...

AI Technical Summary

Problems solved by technology

In the traditional way of producing water, a large amount of industrial wastewater will be generated during operation, which will eventually be collected into the slurry water of the phosphoric acid workshop, reducing the consumption of sedimentation sewage in the phosphoric acid workshop, and eventually leading to more and more sedimentation sewage in the slag field, affecting the production water balance of the entire company , resulting in serious production and environmental pollution pressure, unable to meet the current production and environmental protection safety requirements; while using equipment to treat water, impurities in it will significantly reduce the content of finished products and affect the quality of finished products; Faults such as pipeline fouling, blockage, and corrosion cause the operating cycle of the device to decrease, seriously affect the operating rate of the device, and lead to an increase in operating costs

Combining the above three factors, there is a large room for improvement in the water process of sodium fluorosilicate production equipment

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