Process and system for producing refined salt by using salt production waste liquid

Abstract

The invention relates to the technical field of salt production, in particular to a process for producing refined salt by using salt production waste liquid. The process comprises the following steps of: (1) filtering and preheating: filtering the salt production waste liquid by using a semipermeable membrane, and preheating the waste liquid in a preheater to obtain primary waste liquid; (2) evaporation and thickening: heating and evaporating the primary waste liquid to generate secondary waste liquid with the concentration of 32-35 degrees Be'; (3) cooling and devitrifying: cooling the secondary waste liquid, and filtering to remove the secondary waste liquid to obtain crystallized salt slurry; (4) washing and devitrification: enabling crystallized salt slurry to enter a salt leaching device for saturated brine washing, enabling the washed crystallized salt slurry to enter a salt storage bin and then enter a centrifugal machine through a cyclone to dewater the washed crystallized salt slurry so as to obtain wet salt, and enabling brine mother liquor removed by the centrifugal machine to flow back to the salt leaching device; and (5) drying. By optimizing the process, the phenomena of blockage and refined salt caking in the salt manufacturing process are avoided, and the continuity and stability of salt manufacturing production are ensured.

Description

technical field [0001] The invention relates to the technical field of salt production, in particular to a process and a system for producing refined salt by utilizing salt production waste liquid. Background technique [0002] Salt is the mother of the chemical industry and has a wide variety of uses. In the salt production process, a large amount of salt-making waste liquid will be produced, with a concentration of about 27°Be', containing a large amount of salt, and direct discharge will cause environmental pollution. Therefore, it is necessary to comprehensively utilize the salt-making waste liquid to improve resources. utilization rate. Based on this, patent ZL200710057195.3 discloses a preparation process for producing refined salt using salt-making waste liquid as raw material. The advanced vacuum salt making technology and salt washing process can produce high-quality industrial salt and improve the output and quality of industrial salt; however, this process is la...

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Problems solved by technology

[0003] Aiming at the problems that the existing process of producing refined salt by using salt-making waste liquid is easy to block and the obtained salt is easy to agglomerate, the present invention provides a process and system for producing refined salt by using salt-making waste liquid. Blockage and agglomeration of refined salt occur during the process, thereby ensuring continuous and stable salt production and improving production efficiency

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