New process for fixing carbon dioxide

Abstract

The invention relates to a new process for fixing carbon dioxide and in particular relates to a new method for absorbing carbon dioxide with low concentration by using alkaline wastes. The new process comprises the steps of mixing the alkaline wastes with a certain weight of water, then adding ammonium chloride solution for dissolution to prepare calcium chloride solution and filling CO2 to generate calcium carbonate precipitates. CO2 in the low concentration range can be absorbed by controlling the gas flow rate and the reaction temperature, so that the limitation that CO2 with concentration being more than 30% (volume ratio) can be only absorbed by the traditional methods is overcome, thus achieving complete absorption and near-zero emission of CO2. The process avoids new waste generation when being used for fixing carbon dioxide and meets the requirements of cyclic economy and low-carbon economy.

Description

Technical field:

[0001] The invention relates to a new process for fixing carbon dioxide, especially a method for absorbing low-concentration carbon dioxide by using alkaline waste as raw material, which is directly used for carbon dioxide recycling and emission reduction. Background technique:

[0002] With the development of industrialization, the emission of carbon dioxide is increasing year by year, the El Niño phenomenon occurs frequently, the global temperature continues to rise, and natural disasters are on the rise. In order to meet this challenge, scientific and technological personnel have invented a variety of carbon dioxide emission reduction technologies. Among them, the use of alkaline waste to absorb carbon dioxide can not only solve the accumulation of alkaline waste and the aggravation of the greenhouse effect of carbon dioxide, but also reduce the production cost of calcium carbonate. A new way to kill three birds with one stone.

[0003] Industrial wastes...

Examples

Embodiment 1

[0032] The slurry is prepared by mixing calcium carbide slag: water (mass ratio) = 1:15. Add 2mol / L ammonium chloride solution to dissolve until the pH of the solution is around 8. Filter to obtain a mixed solution of calcium chloride and ammonia water with a solution concentration of 2%. in CO 2 In the absorber, sodium dodecylbenzenesulfonate is added in the filtrate, and the addition of sodium dodecylbenzenesulfonate is controlled to be 0.2% of the calcium carbonate quality that generates. Then feed 6% (volume ratio) CO into the filtrate 2 Gas, the gas flow rate is 10ml / min, and the reaction temperature is controlled at 5°C. After the reaction was finished, the product was analyzed by a scanning electron microscope after filtration and drying, and the crystal form was figure 1 Calcite-type calcium carbonate in shape.

Embodiment 2

[0034] The slurry is prepared by mixing calcium carbide slag: water (mass ratio) = 1:20. Add 3mol / L ammonium chloride solution to dissolve until the pH of the solution is around 8. Filter to obtain a mixed solution of calcium chloride and ammonia water with a solution concentration of 4%. in CO 2 In the absorber, sodium dodecylbenzenesulfonate is added in the filtrate, and the addition of sodium dodecylbenzenesulfonate is controlled to be 0.2% of the calcium carbonate quality that generates. Then feed 10% (volume ratio) CO into the filtrate 2 Gas, the gas flow rate is 15ml / min, and the reaction temperature is controlled to be 12°C. After the reaction was finished, the product was analyzed by a scanning electron microscope after filtration and drying, and the crystal form was figure 2 The shape of vaterite calcium carbonate.

Embodiment 3

[0036] The slurry is prepared by mixing calcium carbide slag: water (mass ratio) = 1:25. Add 5mol / L ammonium chloride solution to dissolve until the pH of the solution is around 8. Filter to obtain a mixed solution of calcium chloride and ammonia water with a solution concentration of 12%. in CO 2 In the absorber, sodium dodecylbenzenesulfonate is added in the filtrate, and the addition of sodium dodecylbenzenesulfonate is controlled to be 0.2% of the calcium carbonate quality that generates. Then feed 25% (volume ratio) CO into the filtrate 2 Gas, the gas flow rate is 20ml / min, and the reaction temperature is controlled to be 75°C. After the reaction was finished, the product was analyzed by a scanning electron microscope after filtration and drying, and the crystal form was image 3 The shape of aragonite calcium carbonate.

Technical field:

[0001] The invention relates to a new process for fixing carbon dioxide, especially a method for absorbing low-concentration carbon dioxide by using alkaline waste as raw material, which is directly used for carbon dioxide recycling and emission reduction. Background technique:

[0002] With the development of industrialization, the emission of carbon dioxide is increasing year by year, the El Niño phenomenon occurs frequently, the global temperature continues to rise, and natural disasters are on the rise. In order to meet this challenge, scientific and technological personnel have invented a variety of carbon dioxide emission reduction technologies. Among them, the use of alkaline waste to absorb carbon dioxide can not only solve the accumulation of alkaline waste and the aggravation of the greenhouse effect of carbon dioxide, but also reduce the production cost of calcium carbonate. A new way to kill three birds with one stone.

[0003] Industrial wastes...

Examples

Embodiment 1

[0032] The slurry is prepared by mixing calcium carbide slag: water (mass ratio) = 1:15. Add 2mol / L ammonium chloride solution to dissolve until the pH of the solution is around 8. Filter to obtain a mixed solution of calcium chloride and ammonia water with a solution concentration of 2%. in CO 2 In the absorber, sodium dodecylbenzenesulfonate is added in the filtrate, and the addition of sodium dodecylbenzenesulfonate is controlled to be 0.2% of the calcium carbonate quality that generates. Then feed 6% (volume ratio) CO into the filtrate 2 Gas, the gas flow rate is 10ml / min, and the reaction temperature is controlled at 5°C. After the reaction was finished, the product was analyzed by a scanning electron microscope after filtration and drying, and the crystal form was figure 1 Calcite-type calcium carbonate in shape.

Embodiment 2

[0034] The slurry is prepared by mixing calcium carbide slag: water (mass ratio) = 1:20. Add 3mol / L ammonium chloride solution to dissolve until the pH of the solution is around 8. Filter to obtain a mixed solution of calcium chloride and ammonia water with a solution concentration of 4%. in CO 2 In the absorber, sodium dodecylbenzenesulfonate is added in the filtrate, and the addition of sodium dodecylbenzenesulfonate is controlled to be 0.2% of the calcium carbonate quality that generates. Then feed 10% (volume ratio) CO into the filtrate 2 Gas, the gas flow rate is 15ml / min, and the reaction temperature is controlled to be 12°C. After the reaction was finished, the product was analyzed by a scanning electron microscope after filtration and drying, and the crystal form was figure 2 The shape of vaterite calcium carbonate.

Embodiment 3

[0036] The slurry is prepared by mixing calcium carbide slag: water (mass ratio) = 1:25. Add 5mol / L ammonium chloride solution to dissolve until the pH of the solution is around 8. Filter to obtain a mixed solution of calcium chloride and ammonia water with a solution concentration of 12%. in CO 2 In the absorber, sodium dodecylbenzenesulfonate is added in the filtrate, and the addition of sodium dodecylbenzenesulfonate is controlled to be 0.2% of the calcium carbonate quality that generates. Then feed 25% (volume ratio) CO into the filtrate 2 Gas, the gas flow rate is 20ml / min, and the reaction temperature is controlled to be 75°C. After the reaction was finished, the product was analyzed by a scanning electron microscope after filtration and drying, and the crystal form was image 3 The shape of aragonite calcium carbonate.

Images