1, pulverized coal reduction method, glauber's salt and pulverized coal in 100 (21 ~ 22.5) (weight ratio) mixing ratio in 800 ~ 1100 ℃ high temperature calcination reduction, the product after cooling heat with dilute alkali dissolved into liquid, let stand after clarification, the upper strong alkali liquor for enrichment, for a quick solid sodium sulfide. A product (or granule) of sodium sulfide in a transit trough, production (or granulation)
Chemical reaction equation: Na2SO4+ 2C, Na2S+2CO2
2. Absorption method, using 380 ~ 420 g/L hydroxide solution to absorb H2S>85% hydrogen sulfide exhaust gas, the resulting product is condensed by evaporation and made of sodium sulfide.
Chemical reaction equation: H2S+2NaOH
3. Barium sulfide is used to decompose barium sulfate with sodium sulphate and barium sulphate to produce sodium sulphide. its
Chemical reaction equation: BaS+ Na2SO4, Na2S+BaSO4
4, gas reduction method, under the presence of iron catalyst, the hydrogen (or carbon monoxide, producer gas, methane gas) in the fluidized bed reaction with sodium sulfate, quality can be obtained from anhydrous granular sodium sulphide (Na2S containing 95% ~ 97%).
Chemical reaction equation:
Na2SO4 co - Na2S + 4 co2 + 4
Na2SO4 + 4 h2 and Na2S + 4 h2o [2]
5, the production method, the refined method to produce by-products produced in the process of precipitated barium sulfate concentration is approximately 4% of sodium sulfide solution as raw material, with the pump into the double-effect evaporator after boil down to 23%, into the drum after iron, in addition to carbon, pump into the evaporator (made of pure nickel material) evaporation lye concentration, to drum water cooled inside the production mechanism, screening, packaging and finished products.