氯化钙助剂分解钾长石制备氯化钾研究评述

发布时间：2018-04-04 00:03

本文选题：氯化钙　切入点：钾长石　出处：《化工进展》2016年12期

【摘要】：概述了国内外以Ca Cl2为助剂分解钾长石制备氯化钾的研究历史及现状。以四川宝兴钾长石资源为例,从工艺过程的反应原理、资源消耗、能量消耗、环境相容性和产品方案等方面,对比分析了Ca Cl2高温活化钾长石矿化CO_2联产氯化钾工艺(高温固碳法)与水热碱法分解钾长石制取硫酸钾工艺(水热碱法)。结果表明,两种工艺分解钾长石在原理上均可行,但高温固碳法的资源消耗、能量消耗和CO_2排放量分别为水热碱法的1.59倍、2.45倍和4.10倍;高温固碳法除产品氯化钾外,需排放大量含氯化氢气体的有毒尾气及固碳尾渣,而水热碱法的副产品均为高附加值产品,三废排放接近于零。高温固碳法的固碳效率低,所固化CO_2仅相当于因固碳而消耗能量所排放CO_2总量的11.9%。因此,高温固碳技术距实际工程应用尚十分遥远。
[Abstract]:The history and present situation of preparation of potassium chloride from potassium feldspar with Ca Cl2 as promoter were summarized.Taking Baoxing potassium feldspar resource in Sichuan as an example, the reaction principle, resource consumption, energy consumption, environmental compatibility and product scheme of the process are discussed.In this paper, the process of producing potassium sulfate from Ca Cl2 high temperature activated potassium feldspar mineralized by CO_2 (high temperature carbon sequestration method) and hydrothermal alkali decomposition of potassium feldspar (hydrothermal alkali method) is compared and analyzed.The results show that the decomposition of potassium feldspar by the two processes can be carried out in principle, but the resource consumption, energy consumption and CO_2 emission of the high-temperature carbon-fixation method are 1.59 times and 4.10 times as much as those of the hydrothermal alkali method, respectively.A large amount of toxic tail gas and carbon sequestration residue containing hydrogen chloride are discharged, while the by-products of hydrothermal alkali process are all high value-added products, and the discharge of three wastes is close to zero.The carbon sequestration efficiency of high temperature carbon sequestration method is low, the cured CO_2 is only 11.9% of the total amount of CO_2 emitted by energy consumption due to carbon sequestration.Therefore, high temperature carbon sequestration technology is far from practical application.
【作者单位】：中国地质大学(北京)材料科学与工程学院;昊青薪材(北京)技术有限公司;
【基金】：中央高校基本科研业务费项目(2652015365)
【分类号】：TQ443.1

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