Phosphoric Acid Impurity Removal and Reuse to Remove Iron, Aluminum, And Fluorine

Wet process phosphoric acid is an important intermediate product in the phosphate chemical industry, which has been used in the production of heavy superphosphate, ammonium phosphate, compound fertilizers, etc. However, due to the characteristics of raw materials and processes, it contains many impurities, mainly phosphates such as aluminum, iron, magnesium, fluorosilicates, and free sulfuric acid.

Due to the need to separate impurities at low viscosity in wet process phosphoric acid, the acid concentration of the product is relatively low. In order to ensure that the quality of phosphoric acid meets the requirements for producing industrial grade, feed grade, and even food grade phosphates, purification and concentration must be carried out.

With the intensification of the energy crisis, it is increasingly urgent to carry out deep purification of wet process phosphoric acid to replace thermal process phosphoric acid.

In response to the above issues, the adsorption resin developed by Haipu for removing iron and aluminum impurities in wet process phosphoric acid can provide assistance for the removal of iron and aluminum impurities in industrial wet process phosphoric acid. Relevant experiments have achieved indicators of iron ion removal rate of 78.49% and aluminum ion removal rate of 89.51%.

The treatment of impurities such as iron, aluminum, and fluorine in wet process phosphoric acid needs to include the following three points: 1. Efficient and stable removal of impurities; 2. Low initial investment cost, low operating cost, and convenient equipment operation and maintenance; 3. Advanced and reliable technology, no secondary pollution.

In response to the above processing requirements, the advantages of Haipu adsorption resin products and their supporting processes are as follows:

• Simple process: Simple process, easy operation, low labor intensity, small footprint, low investment.

• Excellent craftsmanship: capable of implementing modular component forms, flexible adjustment according to production capacity, high degree of automation, short process flow, and low energy consumption.

• Low cost: Low operating cost, stable and reliable treatment effect, able to withstand certain water quality fluctuations and impacts.

• Green and environmentally friendly: mild usage conditions, long equipment lifespan, simple maintenance, minimal subsequent investment, no hazardous waste generated in the process, no secondary pollution, making it a green and environmentally friendly solution.