Method for mineralizing carbon dioxide by production waste residues in potassium feldspar sub-molten salt method

Abstract

The invention relates to the field of carbon dioxide mineralization, in particular to a method for mineralizing carbon dioxide by production waste residues in a potassium feldspar sub-molten salt method. The method comprises the following steps: mixing smashed and ground potash feldspar ore powder, a sub-molten salt solvent and calcium oxide, mixing and performing solid-liquid separation to obtain solid filter residues; mixing the solid filter residues and water, and putting the mixture into a reactor, wherein the solid to liquid ratio is 1:1 to 1:100; introducing CO2 gas, controlling the CO2 partial pressure to be greater than 0.3MPa, the temperature at 30 to 400 DEG C and the stirring rate at 200 to 800 revolutions per minute, and reacting for 1-4 hours for solid-liquid separation to obtain a calcium carbonate-containing mineralization product. By adopting the carbon dioxide mineralization method, recycling of silicate waste residues produced in a process of preparing a potassium fertilizer from the potassium feldspar is realized, and a practically-feasible novel thought is provided for mineralization fixing of CO2 and realization of CO2 emission reduction.

Description

Technical field

[0001] The invention relates to the use of minerals to mineralize CO 2 The technical field of carbon fixation, specifically, is a carbon dioxide mineralization method that uses the potassium feldspar sub-molten salt method to produce waste slag. Background technique

[0002] my country's water-soluble potassium resources and high-quality aluminum resources are extremely scarce. The proven industrial reserves of soluble potassium resources are equivalent to K 2 O is only 130 million tons, which cannot meet the needs of sustainable agricultural development in my country. Especially in recent years, the self-sufficiency rate of potash fertilizer in my country has only maintained at about 50%, and the degree of dependence on foreign countries is still very large. On the other hand, my country has abundant potash-containing ore resources such as potash feldspar, nepheline, and illite, which is equivalent to K 2 O reserves exceed 20 billion tons, which is a potential so...

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