Method for realizing separation of potassium-rich solution through hydrochloric acid coproduced by utilizing membrane electrolysis technology to mineralize CO2

Abstract

The invention discloses a method for realizing separation of a potassium-rich solution through hydrochloric acid coproduced by utilizing membrane electrolysis technology to mineralize CO2. According to the method, diluted hydrochloric acid is added into an anodic area formed by using an anion exchange membrane to separate, the potassium-rich solution containing calcium chloride is added into the cathodic area, direct current is applied between an anode electrode and a cathode electrode, and chloride ions in a catholyte permeate the anion exchange membrane to reach the anodic area under the action of current, so as to combine with hydrogen ions, generated on the anode electrode through hydrogen oxidation, to generate hydrochloric acid; carbon dioxide is pumped into the catholyte to enable the carbon dioxide to be converted into carbonate, so as to enable the carbonate and calcium ions to generate a calcium carbonate precipitation, the hydrogen ions in the catholyte is reduced to be hydrogen on the cathode electrode, the calcium carbonate precipitation is removed out after the electrolysis reaction is completed, the precipitation is filtered and dried to obtain a high-purity calcium carbonate, and the filtrate is potassium chloride solution subjected to purification. According to the method, the mineralization of the carbon CO2 is realized under the conditions of low consumption and high raw material utilization, the production of the high-purity calcium carbonate is realized, and the separation of potassium ions and calcium ions in the potassium-rich solution is realized at the same time.

Description

technical field [0001] The invention relates to a mineralization emission reduction CO 2 method, especially a method for mineralizing CO using membrane electrolysis technology 2 A method for co-producing hydrochloric acid and separating calcium chloride from potassium-rich solution. technical background [0002] Climate warming is an undoubted fact, and more than 90% of the possibilities are caused by human activities. CO in the global atmosphere 2 The mass concentration has been changed from 280×10 before the industrial era -6 increased to 379×10 in 2005 -6 . Due to the gradual increase of global greenhouse gas emissions generated by human activities, the global temperature rises, the sea level rises, and there are more and more smog weather, which seriously endangers people's survival. 6 billion tCO per year must be reduced globally 2 emissions to prevent global warming. Atmospheric "greenhouse effect" and global warming will be the biggest environmental problems f...

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a CO 2 A new way to separate potassium and calcium through mineralization—a method of using membrane electrolysis technology to mineralize CO2 and co-produce hydrochloric acid to realize the separation of potassium-rich solution, so as to solve the problems of high cost, poor separation effect and processing capacity faced by the existing potassium and calcium separation process Minor problems, so as to realize the separation of relatively pure potassium chloride after extracting potassium from potassium feldspar, and in the mineralization of CO 2 Co-produce hydrochloric acid while producing high-purity calcium carbonate, and then efficiently use potassium feldspar to extract potassium to mineralize CO 2 And separate the K in the potassium extraction solution + , Ca 2+ Two elements, in order to achieve in-depth development and utilization of mineral resources and effective separation and purification of potassium and calcium elements

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