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水合肼副产盐渣含有75%左右的氯化钠,150%的碳酸钠,3%的氢氧化钠,1%的氮化物,6%左右的水份,这种混合物很容易结块,直接用于烧碱电解,由于碳酸钠和氮化物含量过高,达不到使用要求,为了降低碳酸钠和氮化物含量,将盐渣进行初步分离部份碱后,配成饱和盐水溶液,然后在饱和盐水溶液中通入氯气,控制一定的碱量和通氯量,在一定的温度下反应可降低饱和盐溶液中碳酸钠含量和氮含量,达到电解法制备氢氧化钠工艺对原料氯化钠的使用要求。中试试验结果表明:盐水中碱的含量为氮含量的10倍,反应温度为40~45℃时,通入氯气量为氮含量的12倍,终点PH控制为6-7左右时,可将盐水中氮含量由450.0mg/L降至小于1.0mg/L,碳酸钠含量降为零。将处理后的饱和盐溶液用于电解制备氢氧化钠,不仅可创造一定的经济效益,而且还解决了水合肼生产中的环境污染问题。
Hydrazine hydrate by-product of salt residue containing about 75% of sodium chloride, 150% sodium carbonate, 3% sodium hydroxide, 1% nitride, 6% of water, this mixture is easy caking, direct For caustic soda electrolysis, because sodium carbonate and nitride content is too high, can not reach the use requirements, in order to reduce the content of sodium carbonate and nitride, salt residue after partial separation of alkali, dubbed saturated brine solution, and then saturated Chlorine gas is introduced into the brine solution to control a certain amount of alkali and chlorine, and the reaction at a certain temperature can reduce the content of sodium carbonate and the content of sodium carbonate in the saturated salt solution to reach the sodium hydroxide content of the raw material sodium chloride Requirements. Pilot test results show that the content of alkali in brine is 10 times that of nitrogen. When the reaction temperature is 40 ~ 45 ℃, the amount of chlorine gas introduced is 12 times of nitrogen content and the end point PH is controlled to be about 6-7. The nitrogen content in brine decreased from 450.0 mg / L to less than 1.0 mg / L, and the content of sodium carbonate dropped to zero. The treatment of saturated salt solution for electrolytic sodium hydroxide, not only to create a certain economic benefits, but also to solve the problem of environmental pollution in the hydrazine hydrate production.