Desulfurization and carbon sequestration absorbent and preparation method thereof

Abstract

The present application relates to the field of environmental protection and emission reduction, and discloses a desulfurization and carbon sequestration absorbent and a preparation method thereof, the raw materials of the desulfurization and carbon sequestration absorbent include substance A, kaolin and paper pulp, wherein the substance A is prepared according to the following procedures: S1, the cement raw material is heated to 900-1100 DEG C for solid-phase reaction, and then cooled to 300-400 DEG C to obtain an intermediate; S2, the intermediate is mixed with water, and then sieved and ground to obtain the substance A; wherein in step S1, the cement raw material contains limestone, high-silicon sandstone with a silicon dioxide content of not less than 80 wt%, low-silicon sandstone with a silicon dioxide content of 20-60 wt% and iron correction material. The desulfurization and carbon sequestration absorbent provided by the present application can achieve a desulfurization and carbon reduction effect of more than 90% on flue gas in a low-temperature environment (≤100 DEG C), and has low cost, and has a good application prospect in the field of flue gas treatment in the steel, power generation, coking and cement industries.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental protection and emission reduction, in particular to a desulfurization and carbon sequestration absorbent and a preparation method thereof. BACKGROUND

[0002] Sulfur dioxide is one of the main atmospheric pollutants and an important indicator of whether the atmosphere is polluted. After entering the respiratory tract, sulfur dioxide is easily dissolved in water, so most of it is blocked in the upper respiratory tract and generates corrosive sulfurous acid, sulfuric acid and sulfate on the moist mucosa, enhancing the irritation. Sulfur dioxide can be absorbed into the blood, causing toxic side effects on the whole body. It can destroy the activity of enzymes, thereby significantly affecting the metabolism of carbohydrates and proteins, and causing damage to the liver.

[0003] Climate change is a global problem faced by mankind. With the emission of carbon dioxide by various countries, greenhouse gases have increased rapidly, threatening the life system. Carbon emission reduction is under great pressure.

[0004] The current absorbent or system can generally only be used for desulfurization or carbon sequestration of flue gas (i.e., different absorbents need to be used for desulfurization and carbon sequestration of flue gas), which is complicated and costly. Therefore, it is of great significance to provide an absorbent capable of simultaneously desulfurizing and carbon sequestrating. SUMMARY

[0005] The present application aims to overcome the problems of the prior art and provide a desulfurization and carbon sequestration absorbent and a preparation method thereof. The desulfurization and carbon sequestration absorbent can simultaneously desulfurize and carbon sequestrate flue gas, has low cost, and has good desulfurization and carbon sequestration effect.

[0006] To achieve the above-mentioned purpose, the present application provides a desulfurization and carbon sequestration absorbent. The raw materials of the absorbent include substance A, kaolin and paper pulp. The substance A is prepared according to the following process:

[0007] S1, cement raw material is heated to 900-1100℃ for solid phase reaction, and then cooled to 300-400℃ to obtain an intermediate;

[0008] S2, the intermediate is mixed with water, then sieved and ground to obtain substance A;

[0009] In step S1, the cement raw material contains limestone, high-silicon sandstone with a silicon dioxide content of not less than 80wt%, low-silicon sandstone with a silicon dioxide content of 20-60wt%, and iron correction material.

[0010] Preferably, the mass ratio of the limestone, high-silicon sandstone, low-silicon sandstone and iron correction material is 85-95:2-6:2-6:1-5.

[0011] Preferably, the content of Fe2O3 in the iron correction material is 10-80 wt%.

[0012] Preferably, the fineness of the substance A is 5-20 μm.

[0013] Preferably, the substance A contains calcium hydroxide, iron oxide, hydrated calcium aluminate, hydrated calcium ferrite and hydrated dodecacerium aluminate.

[0014] Preferably, the weight fraction of the substance A in 100 parts of raw materials is 85-90 parts, the weight fraction of kaolin is 5-10 parts, and the weight fraction of paper pulp is 2-5 parts.

[0015] The second aspect of the present application provides a preparation method of the desulfurization and carbon sequestration absorbent as described above, which comprises the following steps:

[0016] A1, mixing the substance A, kaolin and paper pulp to obtain a mixture;

[0017] A2, extruding the mixture into a honeycomb shape by a grinding tool to obtain a blank;

[0018] A3, drying the blank, and then calcining at 200-300℃ to obtain the desulfurization and carbon sequestration absorbent.

[0019] Preferably, step A1 comprises:

[0020] placing kaolin and part of the substance A in a stirrer, first rotating forward at a speed of 15-25 r / min for 3-8 min, and then rotating backward at a speed of 15-25 r / min for 3-8 min;

[0021] adding paper pulp and the remaining substance A into the stirrer, first rotating forward at a speed of 25-35 r / min for 7-13 min, and then rotating backward at a speed of 25-35 r / min for 7-13 min after standing for 3-8 min.

[0022] Preferably, in step A3, the drying temperature is 80-150℃.

[0023] Preferably, in step A3, the calcining time is 6-60 min.

[0024] The desulfurization and carbon sequestration absorbent provided by the present application has a desulfurization and carbon reduction effect on flue gas of more than 90% in a low-temperature environment (≤100℃), and has low cost, and has good application prospects in the field of flue gas treatment in steel, power generation, coking and cement industries. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0026] Figure 1 is a process flow diagram of a conventional dry clinker production line;

[0027] Figure 2 is a structural diagram of the desulfurization and carbon sequestration absorbent according to the present application. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application are described in detail below. It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the application, are given by way of illustration only, and are not by way of limitation.

[0029] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The endpoints of the ranges and any values are understood to be approximate values. The approximate values allow for variation based on the intended application of the compositions and methods disclosed herein. The approximate values allow for some flexibility in the upper and lower limits of the range. The upper and lower limits of the ranges are understood to be approximate values, and thus the approximate values are understood to be open-ended ranges. Ranges include endpoints between the upper and lower limits. The approximate values are understood to be open-ended ranges for claiming the approximate values and intending that every medium falling within the recited approximate values is included. The approximate values are understood to be approximate values for claiming the approximate values and intending that every medium falling within the recited approximate values is included.

[0030] The present application provides a desulfurization and carbon sequestration absorbent, the raw materials of the absorbent comprising substance A, kaolin and paper pulp, wherein the substance A is prepared according to the following procedure:

[0031] Step S1, the cement raw material is heated to 900-1100℃ for solid phase reaction, and then cooled to 300-400℃ to obtain an intermediate;

[0032] Step S2, the intermediate is mixed with water, and then sieved and ground to obtain the substance A.

[0033] In a preferred embodiment, in step S1, the cement raw material contains limestone, high-silicon sandstone with a silicon dioxide content of not less than 80wt%, low-silicon sandstone with a silicon dioxide content of 20-60wt%, and iron correction material.

[0034] Further preferably, the mass ratio between the limestone, high-silicon sandstone, low-silicon sandstone and iron correction material is 85-95:2-6:2-6:1-5, more preferably 85-92:3-5:3-5:1-3.

[0035] The iron correction material is used to supplement Fe2O3 in cement raw material, and the invention does not limit the specific type of the iron correction material, which can be low-grade iron ore (powder), iron smelting plant tailings, pyrite slag of sulfuric acid plant, copper slag or lead ore. In a preferred embodiment, the content of Fe2O3 in the iron correction material is 10-80wt%.

[0036] Please refer to Figure 1 The intermediate of the invention is mainly taken from the semi-finished product (intermediate product) in the new dry clinker production line. Specifically, the formation process of the cement clinker includes the following steps:

[0037] (1) Water evaporation:

[0038] Free water gradually evaporates with the temperature of the material, and when the temperature rises to 100-150℃, the free water in the raw material is completely removed.

[0039] (2) Clay raw material dehydration:

[0040] When the raw material temperature rises to 450℃, the kaolin loses chemically combined water.

[0041] At 900-950℃, amorphous substances are converted into crystals, and heat is released at the same time.

[0042] (3) Carbonate decomposition:

[0043] Calcium carbonate and magnesium carbonate begin to decompose at 600℃, magnesium carbonate decomposes rapidly at 750℃, and calcium carbonate decomposes rapidly at about 900℃.

[0044] MgCO3 = MgO + CO2

[0045] CaCO3 = CaO + CO2

[0046] (4) Solid phase reaction:

[0047] The main minerals in the cement clinker can be generated by mutual reaction of solid phase substances at 800-1300℃.

[0048] At 800-900℃, CaO reacts with Al2O3 and Fe2O3 to generate calcium aluminate (CA) and calcium ferrite (CF);

[0049] At 900-1100℃, dodeca calcium heptaaluminate (C12A7), C2F and dicalcium silicate (C2S) are generated;

[0050] At 1100-1300℃, C3A (tricalcium aluminate) and C4AF are generated.

[0051] (5) Formation of tricalcium silicate (C3S) and sintering reaction:

[0052] Tricalcium silicate can be formed in a liquid phase. When the temperature is raised to about 1300℃, fluxing minerals such as C3A, C4AF, R2O become liquid phase, C2S and CaO are dissolved in the high-temperature liquid phase, and react with each other to form C3S; the formation rate of C3S is related to the sintering temperature and reaction time. The formation temperature range is generally 1300-1450-1300℃.

[0053] (6) Cooling process of clinker:

[0054] Cooling to obtain cement clinker.

[0055] In the present application, after the cement raw material is heated to 900-1100℃ for solid phase reaction, part of the product after the solid phase reaction is collected by the fifth cyclone and then enters a cooler to be cooled to 300-400℃, thereby obtaining an intermediate product containing CaO, Fe2O3 and Al2O3, and also containing about 10% of calcium aluminate, calcium ferrite and dodecacerium heptaium.

[0056] In step S2 of the present application, after the intermediate product is hydrated with water, hydrated calcium aluminate, hydrated calcium ferrite, iron oxide, calcium hydroxide and hydrated dodecacerium heptaium are formed. Therefore, the substance A contains calcium hydroxide, hydrated calcium aluminate, hydrated calcium ferrite and hydrated dodecacerium heptaium, and the content of calcium hydroxide in the substance A is 70-90wt%.

[0057] In a preferred embodiment, in step S2, the grinding is superfine grinding, and the fineness of the substance A obtained after grinding is 5-20μm.

[0058] It should be noted that the cement raw material according to the present application is a cement clinker (i.e. Figure 1 The cement clinker obtained in the present application has a saturation ratio of 0.88-0.92, a silicate ratio of 2.4-2.7 and an alumina ratio of 1.5-1.8.

[0059] In a preferred embodiment, the weight fraction of the substance A in 100 parts of raw material is 85-90 parts, the weight fraction of kaolin is 5-10 parts, and the weight fraction of paper pulp is 2-5 parts.

[0060] In the present application, the pulp is used to increase the specific surface area of the desulfurization and carbon sequestration absorbent. The present application does not limit the specific type of the pulp, which can be coniferous pulp (such as pulp made from tree species such as Masson pine, larch, Korean pine and spruce), broad-leaved wood pulp (such as pulp made from tree species such as birch, poplar, maple, etc.), straw fiber pulp (such as straw, reed, bamboo and bagasse, etc.) or bast fiber pulp (such as hemp, kenaf, flax, mulberry bark, etc.).

[0061] The desulfurization and carbon sequestration principle of the desulfurization and carbon sequestration absorbent of the present application is as follows:

[0062] Ca(OH)2reacts with acidic substances SO2and CO2to generate CaSO4and CaCO3, thereby reducing the emission concentration of SO2and CO2in flue gas, and Fe2O3acts as a reactant and simultaneously promotes the removal of SO2, the main principle of which is as follows:

[0063] Ca(OH)2+ SO2→ CaSO3+ H2O

[0064] CaSO3+ O2→ CaSO4

[0065] Ca(OH)2+ CO2→ CaCO3+ H2O

[0066] Fe2O3+ SO2+ H2O→ FeSO4+ H2SO4

[0067] H2SO4+ Ca(OH)2→ CaSO4+ H2O.

[0068] The present application also provides a preparation method of the desulfurization and carbon sequestration absorbent as described above, which comprises the following steps:

[0069] Step A1, mixing substances A, kaolin and pulp to obtain a mixture;

[0070] Step A2, extruding the mixture into a honeycomb shape by a grinding tool to obtain a blank;

[0071] Step A3, drying the blank, and then calcining at 200-300°C to obtain the desulfurization and carbon sequestration absorbent.

[0072] In a preferred embodiment, step A1 comprises:

[0073] Put the kaolin and part of the substance A into a stirrer, first rotate at a speed of 15-25 r / min for 3-8 min, then rotate reversely at a speed of 15-25 r / min for 3-8 min; put the paper pulp and the rest of the substance A into the stirrer, first rotate at a speed of 25-35 r / min for 7-13 min, then rotate reversely at a speed of 25-35 r / min for 7-13 min after standing for 3-8 min, to obtain a mixture. Through the forward and reverse stirring, the stirring can be more uniform and sufficient, and through the standing, the CaO and other substances in the intermediate can react with water and digest.

[0074] In a preferred embodiment, in step A3, the temperature of the drying is 80-150℃. The present application does not limit the time of the drying, as long as the blank is dried.

[0075] In step A3 of the present application, by calcining the dried blank at 200-300℃, the paper pulp is combusted in a high-temperature environment, thereby increasing the air rate and specific surface area of the honeycomb-shaped absorbent, which is more conducive to the contact and reaction with the flue gas. Preferably, the calcination time is 6-60 min.

[0076] The advantages and beneficial effects of the desulfurization and carbon sequestration absorbent according to the present application are:

[0077] (1) The present application utilizes the acid-base reaction mechanism, and the alkaline substance Ca(OH)2 reacts with the acidic substances in the flue gas, thereby reducing the concentration of the acidic substances SO2 and CO2 in the waste gas;

[0078] (2) Fe2O3 is used as a catalytic reaction aid to effectively promote the removal reaction of SO2;

[0079] (3) Calcium ferrite (CF) has good photocatalytic activation properties, and about 1% of calcium ferrite is contained in the substance A, which can better play a catalytic activation role, promote the adsorption reaction of SO2 and CO2, and improve the sulfur fixation and carbon reduction efficiency;

[0080] (4) The surface of dodecacalcium heptatitanate (C12A7) has damaged "cages", has a high specific surface area, and is regarded as an open cage-like sub-nanometer cavity with an opening diameter of 0.4 nm, which is close to the size of a metal atom, and can capture metal ions in the flue gas by using its structure. Therefore, C12A7 can not only provide a high specific surface reaction site, but also can adsorb and capture metals in the flue gas, and has a good environmental protection effect.

[0081] (5) The desulfurization and carbon sequestration absorbent is in a honeycomb shape, and paper pulp is used in the formula, which increases the porosity of the desulfurization and carbon sequestration absorbent during high-temperature calcination, and effectively increases the contact area with the flue gas;

[0082] (6) The present application uses the semi-finished product (intermediate product) in the traditional cement industry raw material as raw material, has wide material range and low cost.

[0083] The present application will be described in detail through examples below, but the protection scope of the present application is not limited thereto. In the following examples, the silica content in high-silica sandstone is about 80wt%, the silica content in low-silica sandstone is 50-60wt%, and the content of iron correction material is 40-50wt%.

[0084] It should be noted that the production on the production line is large, and if the raw material ratio is changed, the cement clinker may not be utilized, resulting in huge waste. Therefore, the preparation of the intermediates in Example 1-2, Example 4 and Comparative Example 1-2 of the present application is carried out in a muffle furnace, and the intermediate in Example 3 is directly taken from the cement clinker production line.

[0085] In the following examples, the addition amount of each raw material is shown in Table 1 and Table 2, and the weight fraction is shown in Table 1 and Table 2.

[0086] Table 1 Raw material addition amount of substance A

[0087] Number Limestone High-silica sandstone Low-silica sandstone Ferrous correction material Example 1 85 6 6 4 Example 2 88 5 4 3 Example 3 92 4 2 2 Example 4 95 3 1 1

[0088] Table 2 Raw material addition amount of desulfurization and carbon sequestration absorbent

[0089] Number Substance A Kaolin Paper pulp Example 1 90.0 8.0 2.0 Example 2 90.0 8.0 2.0 Example 3 90.0 8.0 2.0 Example 4 88.0 7.0 5.0

[0090] Example 1

[0091] This example is used to illustrate the desulfurization and carbon sequestration absorbent and the preparation method thereof.

[0092] (1) In a muffle furnace, the cement raw material is heated to 1000℃ for solid phase reaction for 10 min, then collected by the fifth stage cyclone and enters the cold zone device, and cooled to 300℃ in the cooler to obtain an intermediate;

[0093] (2) Water is added to the intermediate, then sieved and superfine ground to obtain substance A with a fineness of about 10μm, wherein the content of calcium hydroxide in substance A is about 70wt%;

[0094] (3) Half of substance A and kaolin are placed in a stirrer, first forward rotating at a speed of 20r / min for 5min, then reverse rotating at a speed of 20r / min for 5min, then paper pulp and the remaining substance A are added to the stirrer, first forward rotating at a speed of 30r / min for 10min, then reverse rotating at a speed of 30r / min for 10min after standing for 5min, to obtain a mixture;

[0095] (4) extruding the mixture into a honeycomb shape with a grinding tool to obtain a green body;

[0096] (5) placing the green body in a multi-layer drying furnace, drying at 100°C, and then calcining at 250°C for 18 min to obtain a desulfurization and carbon sequestration absorbent. The shape of the desulfurization and carbon sequestration absorbent is as shown in Figure 2 .

[0097] Example 2

[0098] This example is used to illustrate the desulfurization and carbon sequestration absorbent and the preparation method thereof according to the present application.

[0099] (1) in a muffle furnace, the cement raw material is heated to 1000°C for solid phase reaction for 10 min, then collected by the fifth stage cyclone and enters the cold zone device, and cooled to 350°C in the cooler to obtain an intermediate;

[0100] (2) water is added to the intermediate, then sieved and superfine ground to obtain substance A with a fineness of about 10 μm;

[0101] (3) half of the substance A and kaolin are placed in a stirrer, first forward rotating at a speed of 15 r / min for 8 min, then reverse rotating at a speed of 15 r / min for 8 min, then paper pulp and the remaining substance A are added to the stirrer, first forward rotating at a speed of 25 r / min for 13 min, then reverse rotating at a speed of 25 r / min for 13 min after standing for 5 min to obtain a mixture;

[0102] (4) the mixture is extruded into a honeycomb shape with a grinding tool to obtain a green body;

[0103] (5) the green body is placed in a multi-layer drying furnace, dried at 150°C, and then calcined at 250°C for 18 min to obtain a desulfurization and carbon sequestration absorbent.

[0104] Example 3

[0105] This example is used to illustrate the desulfurization and carbon sequestration absorbent and the preparation method thereof according to the present application.

[0106] (1) in a decomposition furnace, the cement raw material is heated to 900°C for solid phase reaction for 10 min, then collected by the fifth stage cyclone and enters the cold zone device, and cooled to 400°C in the cooler to obtain an intermediate;

[0107] (2) water is added to the intermediate, then sieved and superfine ground to obtain substance A with a fineness of about 10 μm;

[0108] (3) Put half of the substance A and kaolin into a stirrer, rotate forward at a speed of 20 r / min for 5 min, rotate backward at a speed of 20 r / min for 5 min, then add the paper pulp and the remaining substance A into the stirrer, rotate forward at a speed of 30 r / min for 10 min, stand for 8 min, then rotate backward at a speed of 30 r / min for 10 min, to obtain a mixture;

[0109] (4) Extrude the mixture into a honeycomb shape with a grinding tool to obtain a blank;

[0110] (5) Put the blank into a multi-layer drying furnace, dry at 80℃, then calcine at 300℃ for 18 min to obtain a desulfurization and carbon sequestration absorbent.

[0111] Example 4

[0112] This example is used to illustrate the desulfurization and carbon sequestration absorbent and the preparation method thereof.

[0113] (1) In a muffle furnace, the cement raw material is heated to 1100℃ for solid phase reaction for 10 min, then collected by the fifth cyclone and enters the cold zone device, and cooled to 300℃ in the cooler to obtain an intermediate product;

[0114] (2) Add water to the intermediate product, then sieve and superfine grind to obtain a substance A with a fineness of about 10 μm;

[0115] (3) Put half of the substance A and kaolin into a stirrer, rotate forward at a speed of 20 r / min for 5 min, rotate backward at a speed of 20 r / min for 5 min, then add the paper pulp and the remaining substance A into the stirrer, rotate forward at a speed of 30 r / min for 10 min, stand for 5 min, then rotate backward at a speed of 30 r / min for 10 min to obtain a mixture;

[0116] (4) Extrude the mixture into a honeycomb shape with a grinding tool to obtain a blank;

[0117] (5) Put the blank into a multi-layer drying furnace, dry at 120℃, then calcine at 200℃ for 20 min to obtain a desulfurization and carbon sequestration absorbent.

[0118] Comparative Example 1

[0119] The method described in Example 1 is followed, except that the substance A is replaced by calcium hydroxide.

[0120] Specifically, the preparation method of the desulfurization and carbon sequestration absorbent comprises the following steps:

[0121] (1) Put half of the calcium hydroxide and kaolin into a stirrer, rotate forward at a speed of 20 r / min for 5 min, rotate backward at a speed of 20 r / min for 5 min, then add the paper pulp and the remaining calcium hydroxide into the stirrer, rotate forward at a speed of 30 r / min for 10 min, stand for 5 min, then rotate backward at a speed of 30 r / min for 10 min, to obtain a mixture;

[0122] (2) Extrude the mixture into a honeycomb shape with a grinding tool to obtain a blank;

[0123] (3) Put the blank into a multi-layer drying oven, dry at 100℃, then calcine at 250℃ for 18 min to obtain a desulfurization and carbon sequestration absorbent.

[0124] Comparative Example 2

[0125] The method described in Example 1 is followed, except that the substance A is replaced by a mixture of calcium hydroxide and iron oxide (Fe2O3), and the mass ratio of calcium hydroxide to iron oxide in the mixture is 70:30.

[0126] Specifically, the preparation method of the desulfurization and carbon sequestration absorbent comprises the following steps:

[0127] (1) Mix calcium hydroxide and iron oxide to obtain a mixture, wherein the mass ratio of calcium hydroxide to iron oxide is 70:30;

[0128] (2) Put half of the mixture and kaolin into a stirrer, rotate forward at a speed of 20 r / min for 5 min, rotate backward at a speed of 20 r / min for 5 min, then add the paper pulp and the remaining mixture into the stirrer, rotate forward at a speed of 30 r / min for 10 min, stand for 5 min, then rotate backward at a speed of 30 r / min for 10 min to obtain a mixture;

[0129] (2) Extrude the mixture into a honeycomb shape with a grinding tool to obtain a blank;

[0130] (3) Put the blank into a multi-layer drying oven, dry at 100℃, then calcine at 250℃ for 18 min to obtain a desulfurization and carbon sequestration absorbent.

[0131] Test Example

[0132] Test the desulfurization and carbon sequestration effects of the desulfurization and carbon sequestration absorbents prepared in Test Examples 1-4 and Comparative Examples 1-2 on the flue gas to be treated, wherein the concentration of SO2 in the flue gas to be treated is 300 mg / Nm 3The concentration of CO2 is 35%. The test method is that the flue gas to be treated is respectively introduced into the desulfurization and carbon sequestration absorbent, the residence time of the flue gas is 30s, the treated flue gas is obtained, then the concentrations of SO2 and CO2 in the treated flue gas are tested, and the SO2 removal rate and the CO2 removal rate are calculated; the test results are shown in Table 3.

[0133] Table 3

[0134]

[0135] As can be seen from Table 3, the desulfurization and carbon sequestration effect of the desulfurization and carbon sequestration absorbent prepared in Examples 1-4 is better than that of the comparative examples, which shows that the desulfurization and carbon sequestration absorbent with excellent desulfurization and carbon sequestration effect can be prepared by using the semi-finished product (intermediate product) in the traditional preparation of cement clinker as raw material.

[0136] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0137] In addition, it should be noted that each specific technical feature described in the above-described specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present application will not further describe various possible combination manners.

[0138] In addition, various different embodiments of the present application can also be combined in any manner, as long as it does not deviate from the idea of the present application, and it should also be considered as disclosed content of the present application.

Claims

1. A desulfurization and carbon sequestration absorbent, characterized by, The raw material of the absorbent comprises substance A, kaolin and paper pulp, the fineness of the substance A is 5-20 microns, wherein the substance A is prepared according to the following steps: S1, the cement raw material is heated to 900-1100 DEG C for solid phase reaction, and then cooled to 300-400 DEG C, to obtain intermediate; S2, the intermediate is mixed with water, and then sieved and ground to obtain substance A; In step S1, the cement raw material contains limestone, high silica sandstone with silica content of not less than 80wt%, low silica sandstone with silica content of 20-60wt% and iron correction material; The mass ratio between the limestone, high silica sandstone, low silica sandstone and iron correction material is 85-92:3-5:3-5:1-3; The substance A contains calcium hydroxide, iron oxide, hydrated calcium aluminate, hydrated calcium ferrite and hydrated dodeca calcium heptanium aluminate; Wherein, the desulfurization and carbon sequestration absorbent is prepared according to the following steps: A1, the substance A, kaolin and paper pulp are mixed to obtain a mixture; A2, the mixture is extruded into a honeycomb shape by a grinding tool to obtain a blank; A3, the blank is dried, and then calcined at 200-300 DEG C to obtain a desulfurization and carbon sequestration absorbent.

2. The desulfurizing carbon dioxide absorbent according to claim 1, characterized by, The content of Fe2O3 in the iron correction material is 10-80wt%.

3. The desulfurization carbon fixation absorbent according to claim 1, characterized by, The weight fraction of the substance A in 100 parts of raw material is 85-90 parts, the weight fraction of kaolin is 5-10 parts, and the weight fraction of paper pulp is 2-5 parts.

4. The desulfurization carbon fixation absorbent according to claim 1, characterized by, Step A1 comprises: The kaolin and part of the substance A are placed in a stirrer, first forward rotating at a speed of 15-25 r / min for 3-8 min, and then reverse rotating at a speed of 15-25 r / min for 3-8 min; The paper pulp and the remaining substance A are added into the stirrer, first forward rotating at a speed of 25-35 r / min for 7-13 min, and then reverse rotating at a speed of 25-35 r / min for 7-13 min after standing for 3-8 min.

5. The desulfurization carbon fixation absorbent according to claim 1, characterized by, In step A3, the drying temperature is 80-150 DEG C.

6. The desulfurization carbon fixation absorbent according to claim 1, characterized by, In step A3, the calcination time is 6-60 min.

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