With the continuous progress of the global industrial level, metallic silicon smelting has brought great changes to people's lives, and with the development of industry, serious wastewater pollution problems have come with it. Among them, non-ferrous metallic silicon smelting is a typical high-pollution process. The smelting wastewater contains a large amount of heavy metals. These metals flow into the ecological environment, which will affect soil, crops, aquatic organisms, etc., and seriously endanger human life and health. On the other hand, these waste water will also corrode metals, buildings, equipment, etc., posing a threat to people's production and life. Let's learn it together, see the non-ferrous metallic silicon smelting wastewater treatment methods generally what kinds of?
1. Neutralization method
That is, alkali is added to generate water-insoluble hydroxide. The reagents used are Ca(OH)2, CaCO3, Mg(OH)2, and NaOH.
The advantages are: simple operation, continuous operation and low cost. The disadvantages are: large amount of precipitation, harsh operating environment, and difficult to remove complex ions.
2. Biological methods
That is, heavy metals are attached to biological reagents. The reagents used are biological agents. The advantage is that it can be combined with other processes and is suitable for front-end processing. The disadvantage is: the comprehensive utilization of residues is yet to be studied.
3. Vulcanization method
Instantly use vulcanizing agent to generate sulfide insoluble in water. The reagents used are NaHS, H2S, Na2S. The advantage is: heavy metal removal under low PH state. The disadvantages are: secondary pollution of hydrogen sulfide and high cost.
4. Removal of arsenic by iron salt
The reagent used is FeSO4. The advantage is: suitable for low concentration arsenic treatment. The disadvantages are: large reagent dosage and high cost.
5. Adsorption method
That is, minerals are used as adsorbents to adsorb metal ions. The reagent used is an adsorbent.
The advantage is: suitable for low concentration heavy metal treatment. The disadvantages are: frequent regeneration of the adsorbent and difficulty in recycling the desorption liquid.
6. Membrane separation technology
That is, the selective permeability is used to separate ions, molecules or particles in water. The reagent used is a scale inhibitor. The advantages are: good treatment effect, producing recyclable oil price substances. The disadvantages are: easy to cause membrane fouling and high cost.
Strengthening the treatment of metallurgical wastewater and reducing environmental pollution and damage is an urgent matter at the moment.
The information is provided by metallic silicon supplier.