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2025
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Membrane analysis technology empowers titanium dioxide industry: waste sulfuric acid recovery realizes resource recycling
Author：
Membrane dialysis is a project for recycling and treatment of waste sulfuric acid generated during the production of titanium dioxide by sulfuric acid method using membrane separation technology, aiming at resource recycling and environmental protection and emission reduction. The following is the relevant introduction:
Project Background: Sulfuric acid method is one of the main processes in the production of titanium dioxide, every 1 ton of TiO₂ will produce 6-8 tons of acid concentration of 18%-30% of the waste acid, in addition to the H₂SO₄ component, it also contains ferrous sulfate with a concentration of 8%-17%, as well as a certain amount of TiO₂ and metal sulfates. If directly neutralized, it is not only a waste of resources, but also cause secondary pollution of water, so the effective recovery and treatment of waste sulfuric acid is an important technical challenge for titanium dioxide industry.
Technical principle: The selective permeability of membrane is utilized to separate the waste acid of titanium dioxide production. Different types of membranes can selectively retain or permeate sulfuric acid, ferrous sulfate, titanium dioxide particles and other components, so as to realize the concentration and purification of sulfuric acid, as well as separation and recovery of other components.
Process Flow:
Solid-liquid separation and recovery of titanium dioxide: waste sulfuric acid is first homogenized and adjusted by the conditioning tank, and then pre-treated by acid-resistant filters and cooling systems, and then enters the first-level membrane separation system, which is usually an acid-resistant titanium dioxide particles concentrating membrane processing system, to separate the titanium dioxide particles from the waste sulfuric acid, and the concentrated water containing high concentration of titanium dioxide obtained by the separation can be reused for the production of titanium dioxide.
Removal of iron salts: the produced water of the primary membrane separation system enters the secondary membrane separation system, i.e. acid-resistant metal ion separation membrane treatment system, to separate the iron salts in the waste sulfuric acid, and the concentrated water containing high concentration of iron salts can be used as raw material for the production of iron oxide yellow.
Sulfuric Acid Concentration: The clean dilute sulfuric acid obtained through the secondary membrane separation, after preheating by dripping water and secondary steam, enters into the three-effect evaporation system for concentration, which can enhance the concentration of sulfuric acid to 60%-65%, basically meeting the requirements for reuse.
Other processes: There are processes that will first remove most of the high ferrous sulfate salts in the sulfuric acid wastewater in the form of crystals by freezing crystallization to reduce the concentration of iron salts entering the nanofiltration membrane, and then use the nanofiltration membrane filtration to further remove the ferrous sulfate, and then finally the nanofiltration filtration permeate will be concentrated by vacuum or multi-effect evaporation, to get the recycled sulfuric acid.
Project Advantage:
High resource recycling rate: 99.9% of titanium dioxide particles, 80%-90% of sulfuric acid and 60%-80% of water can be recovered, and the concentrated sulfuric acid can be returned to the titanium dioxide production system as a raw material, thus realizing the recycling of resources.
Significant environmental benefits: significantly reduce the discharge of wastewater and solid waste, reduce the pollution of waste acid to the environment, which helps enterprises to meet the environmental requirements and reduce the pressure of environmental protection and related treatment costs.
Energy saving and consumption reduction: adopting membrane separation technology, no phase change, low energy consumption compared with traditional evaporation and concentration process.
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