Desulfurization/Smelting
Implementing engineering-based emission reductions for sulfur dioxide flue gas and phasing out outdated smelting processes will mitigate atmospheric pollution during production, achieve effective control of sulfur dioxide emissions from flue gas, reduce overall emissions, and improve environmental quality in mining areas and their surrounding regions. This is both a necessity for corporate development and a requirement under relevant national environmental protection policies, fully aligning with national environmental standards.
Limestone desulfurization process:
This method involves grinding limestone powder in a ball mill to produce a slurry with 80% passing a 325-mesh sieve, which is then used as the sulfur dioxide absorbent.
The flue gas exiting the dust collector is routed into the absorption tower via valve control and mixed with upward-sprayed limestone slurry, enabling efficient gas–liquid contact. Through scrubbing with a circulating dilute limestone slurry, more than 88% of the sulfur in the flue gas can be removed. The sulfur dioxide in the flue gas reacts chemically with the limestone to form calcium sulfite, as shown in the following reaction equation:
CaO+SO 2 +1/2H 2 O=CaO · 1/2H2 O+CO 2
Large quantities of air are bubbled into the bottom tank of the absorption tower to oxidize calcium sulfite to calcium sulfate, which then crystallizes and is separated as dihydrate gypsum. The chemical reaction is as follows:
２CaO · 1/2H2 O+O 2 +3H 2 O=2CaO · 2H2 O
The gypsum slurry generated by oxidation is pumped into a inclined-plate thickener, where it is concentrated and dewatered before being disposed of in the tailings dam or, alternatively, blended with tailings sand for use in mining backfilling.
The overflow water is returned to the lime milk preparation process. The flue gas, after removal of sulfur dioxide and particulate matter, exits the top of the absorption tower and is discharged into the atmosphere via the chimney.
Our company’s desulfurization electrodes have been in use for over a decade in applications involving highly corrosive agents, high temperatures, and harsh industrial environments, delivering stable measurement performance, long service life, and excellent cost-effectiveness.
For industries related to desulfurization smelting, our company recommends the following Sensors:
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