Sodium sulfide with anhydrous sodium sulfate

For more than half a century, the production of sodium sulphide in China, except for a small amount of products, is a by-product of strontium salt production, and most of its products are manufactured by carbon reduction. The vast majority of manufacturers produce sodium sulfide in place of origin Glauber's salt or Glauber's salt manufacturers.
Pulverized coal reduction with Glauber's salt is sodium sulfide produced by coal 100:21 to 22.5 (weight ratio) mixed proportion to reduction firing at a high temperature 800 ~ 1 100 ℃, after cooling a liquid product with a dilute alkali thermosol After standing and clarifying, the upper concentrated alkali solution is concentrated to obtain solid sodium sulfide. Through the transfer tank, tableting (or granulation), a tablet (or granular) sodium sulfide product is obtained. Its reaction formula is as follows:

In March 1995, the feasibility study report of the annual production of 10,000 tons of sodium sulfide production plant in Yunnan Yipinglang Salt Mine was examined and demonstrated. The experts unanimously agreed to report the recommended production process of the Glauber's pulverized coal reduction method. The process was adopted: converter combustion, thermal leaching. , filter by van filter press, residual heat recovery of flue waste heat, H ₂ S absorption tower to absorb chemical waste gas, single-effect two-stage external heating forced circulation, vacuum evaporation concentrated lye, finished granulation, obtained in sodium sulfide production A new breakthrough.
In the evaporation process of sodium sulfide, Xinjiang Tianshan Chemical Plant introduced a set of evaporation, separation and production equipment with an annual output of 5,000 tons of sodium sulfide from the United States in 1985. It has gained rich experience and is operating normally, not only the production scale reaches the design scale. And the quality of the produced yellow tablets is very good, and the technology has been domestically produced.

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