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Method for fixing light calcium carbonate as CO2 byproduct by using humate and desulfurization gypsum

A light calcium carbonate, desulfurized gypsum technology, applied in the directions of calcium carbonate/strontium/barium, chemical instruments and methods, separation methods, etc., can solve the problems of limited industrial application, high cost of reaction raw materials, complicated operation process, etc. Low, simple equipment, high carbon sequestration efficiency

Inactive Publication Date: 2012-09-19
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can remove low concentrations of CO in flue gas 2 , to obtain fine calcium carbonate by-products, but the cost of reaction raw materials is high and the operation process is complicated, which limits industrial application

Method used

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  • Method for fixing light calcium carbonate as CO2 byproduct by using humate and desulfurization gypsum
  • Method for fixing light calcium carbonate as CO2 byproduct by using humate and desulfurization gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 , prepare 0.2L of mixed liquid A of desulfurized gypsum and sodium humate, wherein the mass percentage of desulfurized gypsum is 4%, and the mass percentage of sodium humate is 1%; 15% CO 2 , reacted for 2 hours, can absorb about 2.2g CO 2 , to generate calcium carbonate and humic acid precipitated absorption liquid mixture B; after the absorption liquid mixture B is filtered and precipitated, calcium carbonate and sodium humate precipitated mixture and filtrate are obtained, and the filtrate is heated and evaporated to obtain sodium sulfate by-product. Add NaOH solution to calcium carbonate and humic acid precipitation mixture to obtain mixed solution E, adjust the pH of mixed solution E to 9, humic acid becomes soluble sodium humate, calcium carbonate is still precipitated; the mixture E can be obtained after filtering and drying Light calcium carbonate by-product; the filtrate (sodium humate solution) is added to the absorption liquid formed by des...

Embodiment 2

[0022] Such as figure 1 , prepare 0.2L of mixed liquid A of desulfurized gypsum and sodium humate, wherein the mass percentage of desulfurized gypsum is 9%, and the mass percentage of sodium humate is 2%; 30% CO 2 , reacted for 2 hours, can absorb about 5.3g CO 2 , to generate calcium carbonate and humic acid precipitated absorption liquid mixture B; after the absorption liquid mixture B is filtered and precipitated, calcium carbonate and sodium humate precipitated mixture and filtrate are obtained, and the filtrate is heated and evaporated to obtain sodium sulfate by-product. Add NaOH solution to calcium carbonate and humic acid precipitation mixture to obtain mixed solution E, adjust the pH of mixed solution E to 10, humic acid becomes soluble sodium humate, calcium carbonate is still precipitated; the mixture E can be obtained after filtering and drying Light calcium carbonate by-product; the filtrate (sodium humate solution) is added to the absorption liquid formed by de...

Embodiment 3

[0024] Such as figure 1 , prepare 0.2L of mixed liquid A of desulfurized gypsum and potassium humate, wherein the mass percentage of desulfurized gypsum is 20%, and the mass percentage of potassium humate is 8%; 100% CO 2 , reacted for 2 hours, can absorb about 14.9g CO 2 , to generate calcium carbonate and humic acid precipitated absorption liquid mixture B; after the absorption liquid mixture B is filtered and precipitated, calcium carbonate and sodium humate precipitated mixture and filtrate are obtained, and the filtrate is heated and evaporated to obtain sodium sulfate by-product. Add NaOH solution to calcium carbonate and humic acid precipitation mixture to obtain mixed solution E, adjust the pH of mixed solution E to 10, humic acid becomes soluble potassium humate, calcium carbonate is still precipitated; the mixture E can be obtained after filtering and drying Light calcium carbonate by-product; the filtrate (potassium humate solution) is added to the absorption liqu...

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Abstract

The invention discloses a method for fixing light calcium carbonate as CO2 byproduct by using humate and desulfurization gypsum. The method comprises the following steps of mixing desulfurization gypsum and humate as raw materials with water and stirring to obtain a liquid mixture A of desulfurization gypsum and humate; adding the mixture A into an absorption reaction device, introducing CO2, and reacting to form an absorption liquid mixture B containing calcium carbonate and humic acid precipitates; filtering the absorption liquid mixture B to obtain a mixture C of calcium carbonate and humic acid precipitates and a filtrate D, and heating the filtrate D for evaporation to obtain sodium sulfate; adding a NaOH solution into the mixture C of calcium carbonate and humic acid precipitates to obtain a mixture E, and adjusting the pH of the mixture E to allow the formation of soluble sodium humate from humic acid and maintain calcium carbonate precipitates; filtering and drying to obtain a byproduct of light calcium carbonate; and adding desulfurization gypsum into the filtrate G to form an absorption liquid M, and returning to the step b and absorbing and recycling CO2. The method can recycle the absorption liquid, increase the carbon sequestration efficiency, provide the byproduct of light calcium carbonate and achieve the purpose of treating waste with waste and recycling solid waste. Besides, the used devices are simple and low in cost.

Description

technical field [0001] The present invention relates to the greenhouse gas CO 2 The field of fixation technology, specifically a method for fixing CO by using humate and desulfurized gypsum 2 A method for by-producting light calcium carbonate. Background technique [0002] With the rapid development of human society and economy, the consumption of a large amount of petrochemical energy has caused the CO in the atmosphere to 2 The content is increasing year by year, and the greenhouse effect is intensifying. my country's greenhouse gas CO in 2006 2 China's emissions have reached 6.2 billion tons, surpassing the United States to rank first in the world. Facing CO 2 With the huge pressure of emission reduction, it is necessary for our country to carry out CO 2 Research on advanced capture, transportation and storage technologies to establish low-cost, high-efficiency, resource-specific CO 2 Emission reduction technology system. A large amount of petrochemical energy als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/74B01D53/62C01F11/18
CPCY02P20/151
Inventor 孙志国谢洪勇刘昱君
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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