Process for producing H acid by recycling alkali fusion mother liquor

The invention relates to a process for producing H acid by recycling alkali fusion mother liquor, and belongs to the technical field of preparation for the H acid. According to the invention, sulfiteis used to replace potassium hydroxide or sodium hydroxide and is used as a neutralization solution of a denitrification reaction solution, and can be continuously recycled in the process of preparingthe H acid, so that the use amount of potassium hydroxide of which the concentration is 48% is reduced from 11 tons of the original process to less than 5 tons, and the use amount of sodium hydroxideof which the concentration is 48% is reduced from 8 tons originally to less than 3.5 tons, so that the consumption of potassium hydroxide or sodium hydroxide is greatly lowered to effectively lower the production cost of the product. 本发明涉及种通过碱熔母液循环利用生产H酸的工艺，属于H酸的制备技术领域。本发明通过用亚硫酸盐代替氢氧化钾或氢氧化钠作为脱硝反应液的中和液，在制备H酸的过程中可以不断循环利用，使48％氢氧化钾的用量由原工艺的11吨降低到5吨以下，48％氢氧化钠由原来8吨降到3.5吨以下，大幅度降低了氢氧化钾或氢氧化钠的消耗，有效降低了产品的生产成本。