"Membrane" method of making soda ash and "alkali" is in a good state - a documentary on the technological process of remanufacturing soda ash by Shandong Haihua Group

How can traditional soda ash enterprises achieve transformation and upgrading to enhance competitiveness? How can the innovative application of new materials and new technologies promote the process reengineering of soda ash enterprises to reduce costs and increase efficiency? Shandong Haihua Group took the lead in applying nanofiltration membrane technology to soda ash production in the same industry in the country, bringing important changes to the process reengineering of traditional soda ash enterprises

On January 23, at the site of the nanofiltration refined brine project independently developed by Haihua Group, Liu Jianlu, director of Haihua Technology R&D Center and project team manager, introduced that the project produces 35,000 cubic meters of refined brine per day, and each cubic meter can bring in 90 kilograms of raw salt , production capacity and product quality are better than the design value

Underground brine caustic soda dream come true

Haihua has abundant underground brine resources, and it has always been the dream of Haihua people to use underground brine to directly produce soda ash

Since the Haihua soda ash plant was put into operation in 1989, it has been using seawater to make caustic soda

In recent years, nanofiltration and nanofiltration membrane technology has been widely used in the fields of waste treatment, raw material manufacturing and chlor-alkali denitrification

The nanofiltration membrane can filter out the unwanted ions in the brine, so that the purified brine can be used instead of seawater salt to directly make alkali

The pilot-scale project team carried out qualitative tests of nanofiltration, program demonstration, small-scale tests and pilot-scale experiments to explore key problems.

Nanofiltration Membrane Reconstruction Soda Ash Process

　　The innovative application of nanofiltration membrane technology has realized the reengineering of the soda ash process

　　Haihua Soda Ash Plant will use nanofiltration membrane technology to refine brine, instead of seawater salt to directly produce alkali

　　However, 3 months after the project was put into operation, the pressure difference between ultrafiltration and nanofiltration was frequent, and the water production of the equipment dropped significantly.

　　Finding the problem, the project team immediately formulated a targeted improvement strategy

　　Another key issue that causes fouling of nanofiltration membranes is scaling

　　Overcome the problem of high acid brine utilization

　　The integration of air flotation technology and nanofiltration technology in the successful production of alkali from high-acid brine after refining and extraction of bromine is another industry problem that has been overcome in the process of industrial application of Haihua's nanofiltration refined brine technology

　　The brine extracted from the bromine plant has high acidity and is highly corrosive to metal equipment, so the brine after bromine extraction cannot be directly used in the nanofiltration process

　　However, the addition of alkaline waste brings a new problem that the turbidity of the bromine-extracted brine exceeds the standard

　　After technical exchanges and discussions with a number of air flotation manufacturers, they selected the pilot-scale plan for the extraction of bromine brine by air flotation, and conquered the determination of dissolved air volume, the variety and amount of chemicals added, the control of pH, and the installation in high-salt environments.

　　Brine value chain continues to add value

　　Set off towards the comprehensive utilization of brine and seawater depth
.
While building the nanofiltration refined brine project and preparing for the seawater desalination project, Haihua technicians always pay attention to the development and application of new technologies and new processes, and strive to "eat and squeeze" the precious brine resources
.

　　At present, they have completed the preliminary research on the comprehensive utilization of concentrated brine after brine refining, and increased the utilization rate of sodium chloride in brine to more than 80%.
Efficient use of brine
.

　　In the desalination project, they considered the resource utilization of concentrated water
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After the project is completed, it can realize "dense and fresh harvest", comprehensively utilize various resources in seawater, improve the comprehensive utilization rate of seawater, and make Shandong Haihua in a leading position in the seawater desalination industry
.