本发明改变了用煤粉和硫酸钠生产硫化钠的传统工艺，减少煤能源的消耗；
The invention changes traditional process of using coal powder and sodium sulfate to produce sodium sulfide, reduces coal resource consumption;
本发明改变了用煤粉和硫酸钠生产硫化钠的传统工艺，减少煤能源的消耗；
The invention changes traditional process of using coal powder and sodium sulfate to produce sodium sulfide, reduces coal resource consumption;
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