Method for recovering carbon dioxide and preparing calcium carbonate micropowder by utilizing converter slag

A technology of calcium carbonate micropowder and carbon dioxide, applied in the direction of calcium carbonate/strontium/barium, solid waste removal, waste treatment, etc., can solve the problems of high calcium oxide, limit the application of converter slag, etc., and achieve the effect of reducing pollution

Active Publication Date: 2012-11-14
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods limit the application of converter slag in these fields either because the calcium oxide in the converter slag is too high, or because the impurity components (sulfur and phosphorus) in the converter slag are too high

Method used

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  • Method for recovering carbon dioxide and preparing calcium carbonate micropowder by utilizing converter slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 40 g of converter slag with a calcium oxide content of 45% and a particle size of 800 mesh into the leaching reactor; add ammonium chloride and water into the leaching reactor, stir and raise the temperature, and the quality of the added ammonium chloride is 0.5 times the mass of the converter slag , the quality of water added is 3 times of the quality of converter slag, the stirring speed is 500 rpm, the reaction temperature is 90°C, and the reaction time is 90min; the solution after leaching is filtered and washed, and the calcium oxide content in the filter residue is 28%. Directly used as building materials, the pH value of the filtrate is 10; the carbon dioxide discharged in the smelting is passed into the filtrate under stirring conditions, the flow rate of carbon dioxide is controlled to 1000L / min, the stirring speed is controlled to 500 rpm, and the reaction temperature is 90 ℃, the reaction time is 120min, when the pH value of the solution drops to 8, stop f...

Embodiment 2

[0017] 40g of converter slag with a calcium oxide content of 50% and a particle size of 400 meshes was added to the leaching solution returned in Example 1; ammonium chloride was added to the leaching solution, and the temperature was stirred. The temperature is 200 rpm, the reaction temperature is 50°C, and the reaction time is 60 minutes; the leached solution is filtered and washed, the calcium oxide content in the filter residue is 25%, and it is directly used as a building material, and the pH value of the filtrate is 11; the smelted The carbon dioxide discharged in the process is passed into the filtrate under stirring conditions, the flow rate of carbon dioxide is controlled to be 500L / min, the stirring speed is controlled to be 200 rpm, the reaction temperature is 90°C, and the reaction time is 60min. When the pH value of the solution is reduced to 7.5 stop feeding carbon dioxide; the solution is filtered and separated, and the separated filtrate is returned to the intru...

Embodiment 3

[0019] 40g of converter slag with a calcium oxide content of 50% and a particle size of 60 meshes was added to the leaching solution returned in Example 2; ammonium chloride was added to the leaching solution, and the temperature was stirred, and the quality of the added ammonium chloride was 0.1 times that of the converter slag. The reaction temperature is 100°C, and the reaction time is 10 minutes; the leached solution is filtered and washed, the calcium oxide content in the filter residue is 28%, and it is directly used as a building material, and the pH value of the filtrate is 9; the smelted The carbon dioxide discharged in the process is passed into the filtrate under stirring conditions, the flow rate of carbon dioxide is controlled to be 100L / min, the stirring speed is controlled to be 50 rpm, the reaction temperature is 100°C, and the reaction time is 10min. When the pH value of the solution is reduced to 7 , stop feeding carbon dioxide; filter and separate the solutio...

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Abstract

The invention relates to a method for recovering carbon dioxide and preparing calcium carbonate powder by utilizing converter slag. The method comprises the following steps of: grinding the converter slag as a raw material, adding ammonium chloride and water, stirring and heating to 15-100 DEG C, reacting for 10-90min, filtering and washing; directly using the filter residue as a building material and a concrete admixture, wherein carbon dioxide which is emitted during smelting is absorbed by filtrate; reacting for 5-120min at a controlled temperature of 15-100 DEG C under a stirring condition; filtering, washing and drying for 30-120min at 100-180 DEG C; and using the filter residue as high-purity calcium carbonate micropowder and returning the filtrate back to a leaching reactor and re-leaching the converter slag. The invention changes a traditional process method of utilizing the converter slag, develops the new method for recovering the carbon dioxide and preparing the calcium carbonate micropowder by utilizing the converter slag; and the process technology thereof not only can comprehensively utilize the calcium element in the converter slag, but also can recover the carbon dioxide emitted during smelting.

Description

technical field [0001] The invention relates to a comprehensive utilization method of industrial solid waste and tail gas, in particular to a method for preparing calcium carbonate micropowder by recovering carbon dioxide from converter slag. technical background [0002] With the increase of China's steel production year by year, the emission of solid waste and carbon dioxide is increasing year by year, and converter slag and carbon dioxide are one of them. The calcium content is high, and there is a problem of poor stability, which restricts its application in construction and roads. At present, the utilization rate of converter slag in my country is only about 30%, while the utilization rate of carbon dioxide in iron and steel enterprises is even lower, less than 10%. %. Today, with the increasing awareness of the environment, it has become a hot topic at home and abroad to strengthen the research on the reuse technology of converter slag and carbon dioxide and to reduce t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18B09B3/00
CPCY02W30/20
Inventor 史培阳刘承军姜茂发
Owner NORTHEASTERN UNIV LIAONING
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