摘要:
Process for the manufacture of sodium carbonate crystals comprising: the addition of solid sodium carbonate (1) to an aqueous solution comprising sodium bicarbonate and sodium carbonate; the crystallization and the separation of sodium sesquicarbonate crystals; (B, C) the crystallization of sodium carbonate crystals, (E) the amount of sodium carbonate added being adjusted so that the crystallization of sesquicarbonate crystals can be carried out without preliminary evaporation of the aqueous suspension.
摘要:
Process for the manufacture of sodium carbonate crystals comprising: the addition of solid sodium carbonate (1) to an aqueous solution comprising sodium bicarbonate and sodium carbonate; the crystallization and the separation of sodium sesquicarbonate crystals; (B, C) the crystallization of sodium carbonate crystals, (E) the amount of sodium carbonate added being adjusted so that the crystallization of sesquicarbonate crystals can be carried out without preliminary evaporation of the aqueous suspension.
摘要:
A method for the recovery of ammonia from liquor from the filters of ammonia-soda plants, which contains free ammonia and ammonium chloride. In this method the liquor is heated to release the free ammonia, and the remaining liquor is then treated successively in a prelimer with lime in an amount insufficient to decompose the whole part of the ammonium chloride and in a still with steam and an alkali metal hydroxide in an amount sufficient to decompose the remaining part of ammonium chloride.
摘要:
Process for the fabrication of boric acid by carboammoniac attack of a borate mineral, involving subjecting a borosodium ore, in its natural state or previously refined, and in a finely ground condition, to a treatment in an aqueous medium with carbonic anhydride and ammonia in a manner to precipitate sodium bicarbonate which is separated. The remaining mother liquor is cooled to obtain crystals of ammonium borate which are separated, redissolved, the obtained solution being decomposed by thermal means in order to form ammonia which is recycled to the ore treatment and a boric acid solution from which the acid is separated by crystallization. This process permits obtaining two valuable products: NaHCO.sub.3 and H.sub.3 BO.sub.3. When the ore is preliminarily refined, more effective utilization can be made of the ammonia.
摘要翻译:通过硼酸盐矿物的碳水平攻击来制造硼酸的方法,包括将硼酸钠矿石以其天然状态或先前精炼并在细磨的状态下在含有碳酸酐和氨的水性介质中进行处理 沉淀分离的碳酸氢钠。 将剩余的母液冷却以得到硼酸铵晶体,再分离,再溶解,所得溶液通过加热方式分解,形成再循环至矿石处理的氨,并将酸分离的硼酸溶液 结晶。 该方法允许获得两种有价值的产物:NaHCO 3和H 3 BO 3。 当矿石预先精炼时,可以更有效地利用氨。