System and method for treatment of waste ammonia distillation liquid through combination of calcium remover and nano-filtration membrane

Abstract

The invention discloses a system and method for treatment of waste ammonia distillation liquid through a combination of a calcium remover and a nano-filtration membrane. The system for treatment of the waste ammonia distillation liquid comprises a waste ammonia distillation liquid adjusting pond, a gypsum reaction pond, a calcium remover dissolving pond, a gypsum dewatering and drying device, a calcium carbonate reaction separation device, a calcium carbonate dewatering and drying device, a nano-filtration membrane system and a reuse water storage pond; the method for treatment of the waste ammonia distillation liquid comprises the steps of (1) preparation of gypsum slurry; (2) preparation of a gypsum product; (3) calcium carbonate separation; (4) preparation of a light calcium carbonate product; (5) nanofiltration separation and reuse. The treatment technology is simple and low in equipment investment, reduces cost, saves resources, achieves zero discharging of wastewater and is safeand friendly to the environment.

Description

[0001] Technical field: [0002] The invention relates to a system and method for treating ammonia distillation waste liquid, in particular to a system and method for treating ammonia distillation waste liquid in combination with a calcium remover and a nanofiltration membrane. [0003] Background technique: [0004] Ammonia distillation waste liquid is the waste liquid produced during the production of soda ash by the ammonia-soda method. In view of the particularity of its production process, 10m 3 Ammonia distillation waste liquid, and waste residue containing 3% to 5% calcium as the main component, containing 300 to 350kg of solid matter. The solid substance contained is CaCO 3 , SiO 2 , Fe 2 o 3 and Al 2 o 3 , the amount and composition of which vary with the limestone used. [0005] my country's ammonia-soda production of soda ash has a long history, mature technology, large-scale continuous production, high degree of mechanization and automation, high product puri...

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Problems solved by technology

[0007] The patent application number is CN201510115804.0, which discloses a method for preparing high-purity calcium chloride by using the ammonia distillation waste liquid solar pond. It converts calcium ions into calcium chloride products. The process is complicated, and the calcium chloride product industry low value

The patent application number is CN201510864864.2, which discloses a resource utilization method and preparation system for ammonia distillation waste liquid from soda ash production. It uses evaporation and crystallization method to prepare sodium chloride and calcium chloride products, which is costly in industrial application, while The industrial value of sodium chloride and calcium chloride products is low, and the input is far greater than the output, so it is not suitable for large-scale industrial production

The patent application number is CN201620946158.2, which discloses ammonia distillation waste liquid treatment equipment. The cost of evaporation crystallization equipment and forward osmosis membrane equipment used in it is too high, while sodium chloride and calcium chloride products have low industrial value and are not suitable for large-scale Industrial production

[0008] In summary, the existing ammonia distillation waste liquid treatment method cannot meet the requirements of energy saving, environmental protection and sustainable development due to complex process, high energy consumption, high equipment cost, and low industrial value of products. Therefore, it is urgently needed Develop a treatment technology for ammonia distillation waste liquid with simple process, low cost and high industrial value

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