MgO fume abatement

The costs for abatement of the magnesium oxide fume emissions are estimated at about EUR 51.30 per tonne of metal treated. 

Regulations limiting visible emissions and workplace atmosphere quality measures. 

1 Exhaust capture of dust from green sand preparation (sand plant) 

The exhaust air from the green sand preparation is saturated with water. Therefore, wet systems (often of the low pressure type) seem to be most suitable for exhaust capture. However, the wet system is widely being replaced by dry dust abatement. The latter has the advantage that part of the dust may be recirculated and that no waste water stream is generated. Additionally, the wet systems are prone to internal eorrosion and the build-up of dust and oxidation products. The wet separation of exhausted air impurities can result in problems for the waste water cleaning. Dust contains bentonite which is difficult to dispose of due to its anti-sedimentable effects. [225, TWG, 2003] 

When applying fabric filters, condensation problems need to be prevented. Condensation may cause a deposition of dust, clogging and/or a tearing of the filter. The addition of cooling water to the sand needs to be done in a controlled way in order to minimise steam formation. The dew point of the airflow may be increased through heating with gas burners. 

---

Table 4.46 Cost calculation for MgO fume abatement [161, UK Environment Agency, 2002]...

---