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

A carbon dioxide and sub-molten salt technology, applied in chemical instruments and methods, potash fertilizers, applications, etc., can solve problems such as the lack of water-soluble potassium resources and high-quality aluminum resources, and the inability to meet the sustainable development of agriculture

Inactive Publication Date: 2017-05-10
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0002] my country's water-soluble potassium resources and high-quality aluminum resources are extremely scarce, and the proven industrial reserves of solu

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step (1): crush and grind the potash feldspar ore, with an average particle size of 100-200 mesh. Take 10g of potash feldspar powder, 60g of sub-molten salt solvent, and 10g of calcium oxide into the reaction kettle and stir for 1 hour, and then filter and separate.

[0024] Step (2): Take 2g of the filter residue of step (1) into the reaction kettle, add 50ml of water, heat up to 160°C, and pass CO 2 Gas and make the pressure reach 3Mpa, stirring rate 500r / min, 2.5h.

[0025] Step (3): Cool down step (3) to normal temperature, release the pressure to open the reactor, and separate the mineralized materials into solid and liquid. The solid phase is CaCO 3 Mineralization product, the liquid phase is potassium-aluminum solution.

Embodiment 2

[0027] Step (1): crush and grind the potash feldspar ore with an average particle size of 200-300 mesh. Take 20g of potash feldspar powder, 100g of sub-molten salt solvent, and 20g of calcium oxide into the reactor and stir for 1.5h, and then filter and separate.

[0028] Step (2): Take 5g of the filter residue of step (1) and put it into the reaction kettle, add 100ml of water, heat up to 160℃, and introduce CO 2 Gas and make the pressure reach 5Mpa, stirring rate 500r / min, 3h.

[0029] Step (3): Cool down step (3) to normal temperature, release the pressure to open the reactor, and separate the mineralized materials into solid and liquid. The solid phase is CaCO 3 Mineralization product, the liquid phase is potassium-aluminum solution.

[0030] Example 1: The potassium extraction rate is 90.22%, and the mineralization rate is 39.15%

[0031] Example 2: The potassium extraction rate is 90.34%, and the mineralization rate is 46.05%

[0032] Traditional technology 1: Forsterite is combi...

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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...

Claims

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Application Information

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IPC IPC(8): C01F11/18C05D1/00
CPCC01F11/181C05D1/00
Inventor 刘程琳罗孟杰姜炜李平宋兴福于建国
Owner EAST CHINA UNIV OF SCI & TECH
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