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A method of mineralizing co by using potassium feldspar-waste gypsum 2 Industrial process for the co-production of potassium sulfate and sulfur dioxide

A sulfur dioxide, industrial method technology, applied in chemical instruments and methods, alkali metal sulfite/sulfite, solid waste removal and other directions, can solve problems such as burning loss, achieve simple process operation, reduce temperature, and be easy to popularize effect used

Inactive Publication Date: 2019-07-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A method of mineralizing co by using potassium feldspar-waste gypsum <sub>2</sub> Industrial process for the co-production of potassium sulfate and sulfur dioxide
  • A method of mineralizing co by using potassium feldspar-waste gypsum <sub>2</sub> Industrial process for the co-production of potassium sulfate and sulfur dioxide

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 pulverized coal with a fixed carbon content of 60 wt.% and a particle size of 200 μm into a planetary wheel mixer to control the calcium sulfate and carbon. The molar ratio is 1:1, and the uniformly mixed material is fed into 1 through the screw propeller. # silo;

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

[0030] (3) put the mixed material obtained in step (1) into the inner spherical disc pelletizing machine, and simultaneously spray water to make pellets;

[0031] (4) Screen the inner ball obtained in step (3), screen out the inner ball with a diameter of 4mm and put it into the oute...

Embodiment 2

[0040] (1) The calcium sulfate content of 83 wt.%, the particle size of 35 μm phosphogypsum and the fixed carbon content of 65 wt.% and the particle size of 100 μm are put into the planetary wheel mixer, and the molar ratio of calcium sulfate to carbon is controlled to be 1:2, the evenly mixed material is fed 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 the desulfurized gypsum was put into the 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 fed into 2 by the screw propeller # silo;

[0042] (3) put the mixed material obtained in step (1) into the inner spherical disc pelletizing machine, and simultaneously spray water to make pellets;

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

Embodiment 3

[0052] (1) Desulfurized gypsum with a calcium sulfate content of 95 wt.% and a particle size of 75 μm and coke with a fixed carbon content of 80 wt.% and a particle size of 150 μm were put into a planetary wheel mixer, and the molar ratio of calcium sulfate to carbon was controlled to be 1. :3, the mixed material is fed into 1 through the screw propeller # silo;

[0053] (2) The potassium feldspar with a potassium oxide content of 13 wt.% was crushed and ground to 150um and the desulfurized gypsum was put into the planetary wheel mixer, and the mass ratio of potassium feldspar to calcium sulfate was controlled to be 1:3. The uniformly mixed material is fed into 2 by the screw propeller # silo;

[0054] (3) put the mixed material obtained in step (1) into the inner spherical disc pelletizing machine, and simultaneously spray water to make pellets;

[0055] (4) Screen the inner ball obtained in step (3), screen out the inner ball with a diameter of 5mm and put it into the out...

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Abstract

The invention discloses a method of utilizing potassium feldspar-waste gypsum to mineralize CO 2 Industrial process for the co-production of potassium sulfate and sulfur dioxide. The method includes the following steps: (1) Potassium feldspar, waste gypsum and carbonaceous reducing agent are made into composite pellets with a core-shell structure, wherein the inner core is waste gypsum and carbonaceous reducing agent, and the Ca / C molar ratio is 1: 1~3; the outer layer is potassium feldspar and waste gypsum, CaSO 4 / KAlSi 3 o 8 The mass ratio is 1-3:1. (2) Put the composite pellets in a rotary kiln for roasting, and control the residence time in the temperature zone of 800-1100 ° C for 0.5-2 hours to obtain roasted slag and SO-containing 2 Flue gas, the flue gas is used to make sulfuric acid after cooling. (3) The roasted slag obtained in step (2) is immersed in water to obtain 2 SO 4 The leaching solution and CaSiO 3 , Ca(OH) 2 of leaching residue. (4) Add water to the leach slag obtained in step (3) and then conduct CO 2 mineralization reaction. The invention avoids the carbonaceous reducing agent from being oxidized by means of the composite pellets, and utilizes the CO released from the inner core reaction to form the outer layer of CaSO 4 Partial reduction is carried out, which promotes the extraction of potassium and CO 2 mineralization.

Description

technical field [0001] The invention relates to a method for sequestering CO by mineral carbonation 2 The method, in particular, relates to a method for realizing potassium feldspar mineralization of CO through composite pellet technology 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 A global consensus has been reached on emission reduction; as an important means of end emission reduction, CO 2 Capture and storage technology (CCS) has become a key research and test method in major developed countries in the world, but CCS has CO 2 The risk of secondary disasters such as geological disasters and groundwater pollution is easy to leak and buried ...

Claims

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Application Information

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Patent Type & Authority Patents(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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