Specific Uses Of Chelating Agents

Chelation has wide applications in chemical research and industrial production.
In the chemical industry and industrial production process, adding chelating agents to generate chelates with completely different properties from metal ions is the main method to reduce and control the concentration of metal ions.
Chelates are widely used in mineral flotation processes, hydrometallurgy, extraction and separation of metal elements, catalytic synthesis of substances, water softening, electroplating processes, pharmaceutical industry, dyeing processes, etc.
Chelates are widely used in chemical, mechanical and deinked pulp bleaching using hydrogen peroxide and hypochlorous acid as bleaching agents. Some chelating agents can be used medically to treat poisonings such as lead and mercury. The specific uses are as follows:
1. It can effectively inhibit the catalytic decomposition of hydrogen peroxide and hypochlorous acid bleach caused by metal ions, improve bleaching efficiency, save bleaching liquid, and reduce bleaching costs.
2. It has strong capturing ability and dispersion effect on Fe3+ ions, which prevents Fe3+ ions from reacting with the phenolic groups in the pulp to form dark-colored complexes, protects the fiber, improves the whiteness of the pulp, and reduces the yellowing of the pulp.
3. It can effectively prevent calcium, magnesium and other metal ions from chemically reacting to form precipitates during the pulp bleaching process, thereby preventing system equipment and pipelines from scaling, and can gradually remove the original scaling of the rinsing system.
4. It has certain dispersing ability and can improve the dispersion of sodium silicate.
5. Protect pulp fibers and prevent NaOH peeling reaction from damaging the fibers.
6. Compared with traditional DTPA, it has good cost performance.
7. Used for the separation and purification of metal elements, dyeing of fabrics, and manufacturing of organic pigments.