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采用一些物理化学表征手段对包钢烧结电除尘灰的基础性质进行研究。结果表明,该烧结电除尘灰的主要成分为KCl、NaCl、Fe2O3和Fe3O4。烧结电除尘灰的水浸实验表明,烧结电除尘灰中的氯化钾可以通过水浸蒸发的方式回收。浸出液分析结果表明,浸出液中含有大量可溶性硫酸钙。为了获得纯净的氯化钾产品,这些可溶性硫酸钙需要事先进行去除。为了提供抑制硫酸钙从烧结电除尘灰中浸出溶解的理论数据指导,开展了烧结电除尘灰的浸出实验和硫酸钙在KCl、NaCl、K2SO4及其混合盐中的溶解性能实验。结果表明,在浸出过程中,采用小的液固比能很好地抑制烧结电除尘灰中硫酸钙的溶解。研究碳酸钠沉淀剂的浓度、反应温度、搅拌强度和平衡时间对制备球形碳酸钙的影响。获得了分散良好,粒径尺寸小于10μm的球形碳酸钙。同时,设计了一个从烧结电除尘灰提取氯化钾并联产球形碳酸钙副产品的工艺路线。该工艺技术可行,经济效益较好。
Some physico-chemical characterization methods were used to study the basic properties of Baosteel sintered ESP. The results show that the main components of the sintered ESP are KCl, NaCl, Fe2O3 and Fe3O4. The flooding experiments on the sintered ESP show that the potassium chloride in the ESP can be recovered by water evaporation. Leaching solution analysis showed that the leachate contains a lot of soluble calcium sulfate. In order to obtain pure potassium chloride products, these soluble calcium sulphates need to be removed in advance. In order to provide theoretical data for the inhibition of calcium sulfate leaching and dissolution from sintered ESP, the leaching experiment of ESP and the solubility of calcium sulfate in KCl, NaCl, K2SO4 and their mixed salts were carried out. The results show that in the leaching process, the use of small liquid to solid ratio can well inhibit the sintering of calcium carbide dust in the ESP. The effects of sodium carbonate precipitant concentration, reaction temperature, stirring intensity and equilibration time on the preparation of spherical calcium carbonate were investigated. A well-dispersed, spherical calcium carbonate with a particle size of less than 10 μm was obtained. At the same time, a process of extracting potassium chloride from sintering ESP and co-producing spherical calcium carbonate by-product was designed. The technology is feasible and the economic benefit is better.