Environmental protection issues in the production of sodium metabisulfite

1. Wastewater: The process wastewater produced by sodium metabisulfite comes from the washing process. The main pollution factors are: sodium sulfite, sulfuric acid, sulfur and other impurities. This dilute acid water is a common problem in the sodium metabisulfite industry. The amount of waste water produced is about 50-80 kg per ton of sodium tar product. The current treatment process mainly includes: lime neutralization, soda ash neutralization, and preparation of magnesium sulfate. Lime neutralization cost is low, there is calcium sulfate solid waste generation, soda ash neutralization cost is higher, there is no solid waste generation, the production of magnesium sulfate is a good direction, but it needs convenient magnesium resources, and relatively more investment.

2. Exhaust gas: Sodium metabisulfite waste gas comes from synthetic tail gas and dry exhaust gas. Soda ash washing is the most effective and reasonable treatment method, and the absorption liquid can be reused in the alkali mixing process. This can not only achieve the emission standard of exhaust gas, but also improve the sulfur yield. The treatment equipment generally uses a packing absorption tower to remove SO2 in the tail gas by countercurrent absorption.

Sodium sulfite has a very wide range of applications. It is used as a safety powder in medicine, and is used in organic synthesis and leather making in industry. From this, it can be seen that the development of sodium metabisulfite is very impressive. Sodium metabisulfite is a kind of Chemical substances, what do we need to pay attention to during use?

        Sodium metabisulfite is a chemical agent that is soluble in water. When using sodium metabisulfite, pay attention to the closed operation, check whether the packaging is intact during transportation, carefully place it during loading, and prevent exposure to sunlight and rain during transportation. appear. It is recommended that operators need to wear dust masks and anti-virus work clothes, because once the sodium metabisulfite enters the eyes, the consequences are unimaginable. If it is light, it can be washed with normal saline and water, and serious medical treatment should be sought immediately. It should be reminded that the storage of sodium metabisulfite must be placed in a cool, dry, ventilated place away from fire and heat.