Limestone pulverization is a core step in flue gas desulfurization, directly impacting desulfurization efficiency. This article analyzes its regulatory framework from the perspectives of technical principles, standards, processes, and optimization key points.

1. Technical Principle

Based on the acid-base neutralization reaction between CaCO₃ and SO₂: CaCO₃ + SO₂ + 1/2 O₂ → CaSO₃ + CO₂, the generated CaSO₃ is oxidized to CaSO₄, achieving SO₂ solidification. The fineness and activity of the limestone powder must be ensured.

2. Quality Standards

1. Composition: CaO ≥ 50%, MgO ≥ 30%, silicate ≤ 5%, sulfate ≤ 0.5%.

2. Fineness: 95% passing through 250 mesh sieve with residue ≤5%.

3. Activity: ability to respond quickly.

4. Appearance: White powder, no lumps, store in a dry place.

3. Flour Making Process

1. Pretreatment: crushing, iron removal and impurities removal.

2. Grinding: Use medium-speed and high-pressure equipment (such as Raymond mill and vertical mill) to crush and control particle size.

3. Classification and collection: Classification by the powder selector and collection by cyclone to ensure the particle size concentration.

4. Key Optimization

1. Fineness control: Adjust the mill parameters to precisely control the particle size (e.g. d50 = 0.12mm).

2. Increased activity: Microcracks and pores increase the specific surface area.

3. Equipment selection: Low energy consumption and long life equipment (e.g. column mill wearing parts have a life of 1.5-2 years).

4. Automated quality control: real-time monitoring of raw materials, parameters and finished product indicators.

5. Environmental Benefits

Strict regulations can stabilize desulfurization efficiency, recycle by-product gypsum, reduce energy consumption and emissions, and meet green production requirements.

Conclusion

Limestone powder production requires strict control from raw materials to processes. Through refined technology and quality control, desulfurization efficiency can be improved, costs can be reduced, and industrial emissions reduction and sustainable development can be promoted.