Industrial method for co-producing potassium sulfate and sulfur dioxide through CO2 mineralization by using potassium feldspar-waste gypsum

A technology of sulfur dioxide and industrial methods, applied in chemical instruments and methods, alkali metal sulfite/sulfite, solid waste removal, etc., can solve problems such as burning loss, achieve simple process operation, easy promotion and use, and reduce The effect of temperature

Inactive Publication Date: 2017-09-29
SICHUAN UNIV
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Problems solved by technology

[0005] Mineralization of CO for existing potassium feldspar-industrial waste gypsum 2 Co-production of potassium sulfate technology has problems in industrialization. The present invention solves the problem of reducing agent carbon being burned by residual oxygen in the flue gas during the preheating stage of the rotary kiln by skillfully constructing composite pellets with a core-shell structure, and realizes potassium growth. Low temperature activation of rock to extract potassium, and effectively improve the utilization rate of sulfur resources and CO 2 Mineralization rate

Method used

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  • Industrial method for co-producing potassium sulfate and sulfur dioxide through CO2 mineralization by using potassium feldspar-waste gypsum

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Put titanium gypsum with a calcium sulfate content of 70 wt.% and a particle size of 75 μm and coal powder with a fixed carbon content of 60 wt.% and a particle size of 200 μm into a planetary wheel mill mixer to control the balance between calcium sulfate and carbon The molar ratio is 1:1, and the uniformly mixed materials are sent into the 1 # silo;

[0029] (2) The potassium feldspar with a potassium oxide content of 8 wt.% was crushed and ground to 75um and titanium gypsum was put into a planetary wheel mill mixer, and the mass ratio of potassium feldspar to calcium sulfate was controlled to be 1:1. The uniformly mixed material is sent into the 2 # silo;

[0030] (3) Put the mixed material obtained in step (1) into the inner ball disc pelletizing machine, and spray water into the pelletizing machine at the same time;

[0031] (4) Screen the inner ball obtained in step (3), and put the inner ball with a diameter of 4mm into the outer ball disc pelletizer, put ...

Embodiment 2

[0040] (1) Put phosphogypsum with a calcium sulfate content of 83 wt.% and a particle size of 35 μm and coal powder with a fixed carbon content of 65 wt.% and a particle size of 100 μm into a planetary wheel mill mixer, and control the molar ratio of calcium sulfate to carbon as 1:2, the uniformly mixed material is sent into 1 through the screw propeller # silo;

[0041] (2) The potassium feldspar with a potassium oxide content of 10 wt.% was crushed and ground to 150um and desulfurized gypsum was put into a planetary wheel mill mixer, and the mass ratio of potassium feldspar to calcium sulfate was controlled to be 1:2. The uniformly mixed material is sent into the 2 # silo;

[0042] (3) Put the mixed material obtained in step (1) into the inner ball disc pelletizing machine, and spray water into the pelletizing machine at the same time;

[0043] (4) Screen the inner ball obtained in step (3), and put the inner ball with a diameter of 6 mm into the outer ball disc pelletize...

Embodiment 3

[0052] (1) Put desulfurized gypsum with a calcium sulfate content of 95 wt.%, a particle size of 75 μm, and coke with a fixed carbon content of 80 wt.%, and a particle size of 150 μm into a planetary wheel mill mixer, and control the molar ratio of calcium sulfate and carbon to 1 : 3, the uniformly mixed material is sent into 1 through the screw propeller # silo;

[0053] (2) Put the potassium feldspar with a potassium oxide content of 13 wt.% into a planetary wheel mill mixer by crushing and grinding it to 150um and desulfurization gypsum, and control the mass ratio of potassium feldspar and calcium sulfate to 1:3. The uniformly mixed material is sent into the 2 # silo;

[0054] (3) Put the mixed material obtained in step (1) into the inner ball disc pelletizing machine, and spray water into the pelletizing machine at the same time;

[0055] (4) Screen the inner ball obtained in step (3), and put the inner ball with a diameter of 5mm into the outer ball disc pelletizer, pu...

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Abstract

The invention discloses an industrial method for co-producing potassium sulfate and sulfur dioxide through CO2 mineralization by using potassium feldspar-waste gypsum. The method comprises the following steps of (1) preparing composite pellets with a core-shell structure from potassium feldspar, waste gypsum and a carbonaceous reductant, wherein a core is prepared from the waste gypsum and the carbonaceous reductant and the molar ratio of Ca / C is 1:(1-3); and an outer layer is prepared from the potassium feldspar and the waste gypsum, the mass ratio of CaSO4 / KAlSi3O8 is (1-3):1; (2) roasting the composite pellets in a rotary kiln, controlling the standing time within a temperature zone of 800-1100 DEG C to be 0.5-2h to obtain a roasted residue and an SO2-containing flue gas, cooling the flue gas for preparing sulfuric acid; (3) soaking the roasted residue obtained in the step (2) into water to obtain a leaching agent containing K2SO4 and leaching residues of CaSiO3 and Ca(OH)2; and (4) adding water to the obtained leaching residues for slurry mixing and then carrying out CO2 mineralization reaction. The carbonaceous reductant is prevented from being oxidized by virtue of the composite pellets, and meanwhile, CaSO4 of the outer layer is partially reduced by using CO released from core reaction, so that potassium extraction and CO2 mineralization are promoted.

Description

technical field [0001] The invention relates to a method for sequestering CO by mineral carbonation 2 method, in particular to a method for the mineralization of potassium feldspar through composite pellet technology CO 2 Industrial process for the co-production of potassium sulfate and sulfur dioxide. Background technique [0002] Since the Industrial Revolution, massive use of fossil fuels has led to atmospheric CO 2 The concentration rises rapidly, and the resulting greenhouse effect has a serious impact on the sustainable development of natural ecosystems and human society; currently CO 2 Emission reduction has reached a global consensus; as an important means of terminal emission reduction, CO 2 Capture and storage technology (CCS) has become a key research and test method in the world's major developed countries, but CCS has CO 2 Risk of secondary disasters such as geological disasters and groundwater pollution that are prone to leakage and burial; CO 2 Mineraliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01B17/50C01B17/74C01B32/55B09B3/00
CPCC01B17/506C01B17/745C01D5/00B09B3/80B09B3/40
Inventor 李春李如虎莫淳梁斌岳海荣杨超上官文杰刘强刘维燥胡金鹏汪霖
Owner SICHUAN UNIV
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