Potassium ferrocyanide mother liquid treating and recycling system

Abstract

The invention relates to the technical field of chemical engineering, in particular to a potassium ferrocyanide mother liquid treating and recycling system. The treating and recycling system comprises a reaction generation unit, a material storing unit, a first-class nanofiltration unit, a second-class nanofiltration unit, a reverse osmosis unit and an evaporative crystallization unit that are distributed in sequence, wherein an inlet and an outlet of the material storing unit are respectively connected with an outlet of the reaction generation unit and an inlet of the first-class nanofiltration unit; an inlet and an outlet of the second-class nanofiltration unit are respectively connected with an outlet of the first-class nanofiltration unit and an inlet of the reverse osmosis unit; and an outlet of the reverse osmosis unit is connected with an inlet of the evaporative crystallization unit. The treating and recycling system provided by the invention has the advantages that potassium ferrocyanide mother liquid can be completely treated, the system is simple, the operation is convenient, the treating effect of the mother liquid is good, cost reducing is facilitated, and the production benefits are improved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a treatment and recovery system for yellow blood salt mother liquor. Background technique [0002] Yellow blood salt, also known as potassium ferrocyanide, is an important chemical raw material, often used in steel carburizing agent or salt anticaking agent. The industrial production methods of yellow blood salt mainly include coking acid gas method and chemical synthesis method. The production mother liquor obtained by the two methods contains high concentration of formate, which affects the precipitation purity of yellow blood salt, resulting in high residual in the mother liquor concentration of yellow blood salt. [0003] In the prior art, the treatment method of the yellow blood salt mother liquor is: dilute the mother liquor with a large amount of clear water, and then undergo microbial aerobic anaerobic fermentation, chemical oxidation and reverse osmosis membra...

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Problems solved by technology

Based on the production of 50t of yellow blood salt mother liquor per hour, the inorganic salt solid waste produced by the above method is as high as 65,700t per year. It is obvious that if the waste water is directly evaporated, the heat energy consumed is too large and the treatment cost is too high; Moreover, the evaporated solid material has complex components and cannot be used. It can only be treated as hazardous chemical solid waste, which brings a heavy economic burden to the enterprise and restricts the smooth production of yellow blood salt on a large scale.

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