Method for the production of SODIUM SULPHIDE
One, coal reduction method: mirabilite and coal according to 100: ( 21 ~ 22.5 ) ( weight ratio ) mixing ratio from 800 to 1100 ℃calcination reduction, product after cooling with dilute alkali melt into liquid, static clarification, the upper concentrated alkali solution concentration, the solid sodium sulfide. Through the transfer groove, producer ( or grain ) prepared tablet ( or particle ) - sodium sulfide products.
Chemical reaction equation: Na2SO4+2C→ Na2S+2CO2
Two, absorption method : 380 ~ 420 g\/L sodium hydroxide solution containing hydrogen sulfide absorption of H2S>85%, - the product through evaporation and concentration, sodium sulfide prepared products.
Chemical reaction equation: H2S+2NaOH→ Na2S+2H2O
Method: three, barium sulfate with sodium sulfate and barium sulfide precipitation of barium sulfate metathesis reaction can be obtained when the by-product sodium sulfide. The
Chemical reaction equation: BaS+Na2SO4 →Na2S+BaSO4
Four, gas reduction method: in the presence of Fe catalyst, hydrogen ( or carbon monoxide, producer gas, methane ) in the reaction with sodium sulfate fluidized bed furnace, can be prepared by anhydrous sodium sulfide ( high quality granular containing Na2S 95% ~ 97% ). The
Chemical reaction equation:
The Na2SO4+4CO→ Na2S+4CO2
The Na2SO4+4H2→ Na2S+4H2O
Production method: five, sodium sulfide solution refining method to produce a by-product of barium sulfate precipitation concentration of about 4% as raw material, with the pump at a double-effect evaporator concentration to 23%, into the mixing tank iron removal, carbon removal treatment, beatings evaporator pump ( with pure nickel material manufacturing ) evaporating lye achieve concentration, sent to the machine made of drum water internal cooling type production, after screening, packaging and finished product.
Pulverized coal reduction of mirabilite method this method is the production of sodium sulfide traditional, equipment, material, increase the iron removal process so that products meet the standard improvement in the machining process.