Resourceful treatment method and device for inorganic salts in industrial wastewater

Abstract

The invention provides a resourceful treatment method and device for inorganic salts in industrial wastewater. The resourceful treatment method comprises a primary sedimentation tank, a primary low-temperature evaporation and concentration device, a secondary low-temperature evaporation and concentration device and a concentrated liquid discharging device; the primary sedimentation tank is connected with a raw water inlet and is used to separate out colloidal silicon in raw water, and separated silicon dioxide is recycled after primary filtration; the primary low-temperature evaporation and concentration device is connected with the primary sedimentation tank and is used to concentrate soluble silicon in the raw water to be supersaturated, and then the supersaturated silicon is separated out; the secondary low-temperature evaporation and concentration device is connected with the primary low-temperature evaporation and concentration device and is used to continue concentrating silicon dioxide in the raw liquid to be supersaturated, and the supersaturated silicon dioxide is separated out; and the concentrated liquid discharging device is connected with the secondary low-temperature evaporation and concentration device and is used to discharge the concentrated liquid which is concentrated in place. According to the invention, a low-temperature evaporation crystallization process is adopted, and equipment can be prevented from scaling; a conventional chemical silicon removal process is changed into a whole-process physical silicon removal process, so that reagent adding cost is reduced, and the concentration of recycled silicon dioxide is improved. In addition, the process flow is shortened, the investment amount is small, the recycle degree is large, secondary pollutants are not generated, and the separated silicon dioxide can be completely recycled to a production line.

Description

technical field [0001] The invention relates to the field of industrial wastewater, in particular to a resource treatment method and device for inorganic salts in industrial wastewater. Background technique [0002] At present, in the production process of white carbon black, a large amount of silicon-containing wastewater will be produced, and the silicate contained in it can reach 2.0%~4.0% in terms of SiO2, and it is quite stable. The silicon in the wastewater discharged from the production of catalysts is brought in by the raw material water glass. During the reaction process, the new ecological SiO2 is initially in a crystalline state and forms a true solution, but the dissolved SiO2 has a great polymerization ability and can be gradually combined in the Together they form a typical negatively charged SiO2 colloidal solution. Colloidal silicon and dissolved silicon in water can be converted to each other. These wastewaters are generally alkaline and have a high tempera...

AI Technical Summary

Problems solved by technology

Although this invention can clean waste water to a certain extent without causing pollution, it does not achieve good results in reducing work costs

Images