Method for concurrent production of potassium chloride and mineralization fixation of CO2

A potassium chloride and CO2 technology, applied in the direction of alkali metal chloride, etc., can solve the problems of high heat source cost, ring formation in the reactor, and high material requirements for mineralization reaction equipment, so as to improve economy, avoid corrosion, and reduce equipment. The effect of material requirements

Inactive Publication Date: 2015-06-10
SICHUAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a method for producing potassium chloride while mineralizing and fixing CO 2 method to solve the problems of ring formation in the reactor, high material requirements for mineralization reaction equipment and high cost of heat source, and promote industrial production

Method used

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  • Method for concurrent production of potassium chloride and mineralization fixation of CO2
  • Method for concurrent production of potassium chloride and mineralization fixation of CO2

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Embodiment 1

[0030] The process flow chart of this embodiment is as figure 1 As shown, the process steps are as follows:

[0031](1) Crush potassium feldspar, calcium chloride and coal to a particle size of ≤2 mm, and mix according to dry basis mass of potassium feldspar: dry basis mass of calcium chloride: dry basis mass of coal = 1:1:0.14, and mix the The solid mixture composed of ingredients is added to a vertical ball mill for ball milling until the particle size is ≤0.10mm, and then the mixed powder after ball milling is added with sodium humate with a total dry basis mass of three raw materials of 1.5% and three raw materials with a total dry basis mass of 13 % of water and mixed evenly, use conventional methods (such as disc pelletizing method, cylinder pelletizing method) to prepare pellets with a diameter of 5-8 mm, and dry the pellets at 260°C for at least 15 minutes for later use. The ash melting point of the dried pellets is 1150°C.

[0032] (2) The material balls prepared in...

Embodiment 2

[0039] The process flow chart of this embodiment is as figure 2 As shown, the process steps are as follows:

[0040] (1) Crush potassium feldspar, calcium chloride and coal to a particle size of ≤2 mm, and mix according to dry basis mass of potassium feldspar: dry basis mass of calcium chloride: dry basis mass of coal = 1︰0.6︰0.1. The solid mixture composed of ingredients is added to a vertical ball mill and ball-milled until the particle size is ≤0.075mm, and then the mixed powder after ball milling is added to asphalt or water glass with 3% of the total dry basis of the three raw materials, mixed evenly, and pressed into a size of Φ10 *For a 5mm profile, the ash melting point of the resulting profile is 1180°C.

[0041] (2) The profile prepared in step (1) is continuously sent into the rotary kiln from the kiln tail of the rotary kiln, and the air is continuously sent into the rotary kiln from the kiln head of the rotary kiln. In the rotary kiln, the air and the profile mo...

Embodiment 3

[0048] The process flow chart of this embodiment is as figure 1 As shown, the process steps are as follows:

[0049] (1) Grind potassium feldspar, calcium chloride and coal to a particle size of ≤2 mm, and mix according to dry basis mass of potassium feldspar: dry basis mass of calcium chloride: dry basis mass of coal = 1: 1.5: 0.25, and mix the The solid mixture composed of ingredients is added to a vertical ball mill for ball milling until the particle size is ≤0.10mm, and then the mixed powder after ball milling is added with 5% bentonite on a dry basis of the three raw materials and water with 10% of the total dry basis of the three raw materials After mixing evenly, use conventional methods (such as disc pelletizing method, cylinder pelletizing method) to prepare pellets with a diameter of 10-15mm, and dry pellets at 150°C for at least 30 minutes for later use. The obtained dried pellets Its ash melting point is 1060°C.

[0050] (2) The material balls prepared in step (...

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Abstract

The invention belongs to the comprehensive field of potassium fertilizer production and CO2 emission reduction, and provides a method for concurrent production of potassium chloride and mineralization fixation of CO2. The process steps comprise: (1) adopting potassium feldspar, calcium chloride and coal as raw materials, preparing materials, carrying out ball milling, and carrying out pressing molding or pelletizing; (2) conveying the molded material or the material balls into a rotary kiln from the kiln tail, conveying air into the rotary kiln from the kiln head, and controlling a residence time of the molded material or the material balls at a temperature range of 800-1000 DEG C to 20-40 min; (3) crushing the calcinated material, and adding water to carry out potassium leaching through the water; (4) adding water to the potassium leaching residue to carry out pulp conditioning, and introducing CO2 to carry out a mineralization reaction; (5) carrying out returning of the potassium leaching solution so as to be used for leaching of potassium from the calcinated material when the Baume degree of the potassium leaching solution is less than or equal to 29, and carrying out evaporation concentration on the potassium leaching solution to achieve the Baume degree of 42-42.5 when the Baume degree of the potassium leaching solution is more than 29, and cooling to carry out potassium chloride crystallization; and (6) cooling the potassium extraction mother liquor to carry out calcium chloride crystallization, and carrying out solid-liquid separation to obtain calcium chloride and the calcium extraction mother liquor.

Description

technical field [0001] The invention belongs to potash fertilizer production and CO 2 The comprehensive field of emission reduction, especially related to the production of potassium chloride while mineralizing and fixing CO 2 Methods. Background technique [0002] CO from fossil fuel combustion 2 Emissions are the most important factor causing global warming, how to reduce CO 2 Emissions and more effective mitigation of the greenhouse effect have become important issues to be solved urgently by countries all over the world. Currently, the large-scale treatment of CO 2 The main methods are geological storage, ocean storage and CO storage. 2 Three methods of mineralization, studies have shown that CO 2 Mineralization is a safe and stable CO 2 Fixed method, but at home and abroad mainly use natural ore containing calcium and magnesium in large quantities such as forsterite, serpentine, wollastonite, etc., and industrial solid waste such as steel slag and phosphogypsum, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/08B01D53/62
Inventor 谢和平梁斌李春王昱飞吕莉岳海荣朱家骅绳昊一袁博王超叶龙波刘涛
Owner SICHUAN UNIV
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