CN112275326A

CN112275326A - High-efficiency liquid sulfur-fixing catalyst and application thereof

Info

Publication number: CN112275326A
Application number: CN202011150008.8A
Authority: CN
Inventors: 鲁昌宝
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-01-29

Abstract

The invention relates to the technical field of kiln tail waste gas emission desulfurization treatment of cement enterprises, in particular to a high-efficiency liquid sulfur-fixing catalyst and application thereof, wherein the preparation raw materials at least comprise the following components in parts by weight: 11-19 parts of wetting agent, 5-8 parts of dispersing activator, 30-36 parts of absorbent, 9-19 parts of catalyst, 7-9 parts of combustion improver and 38-43 parts of carrier; the invention combines the mechanism characteristic of waste gas sulfur generated at the tail of a kiln in clinker production of a cement enterprise, starts from the specific process of raw material grinding and raw material preheating from the viewpoint of solving the problem scientifically and economically, and effectively solves the key problem of the redecomposition of a sulfur-fixing product caused by the short contact time of a sulfur-fixing agent and sulfur dioxide and the long-time retention of a desulfurizer in the high-temperature environment of a coal bed through an innovative technical thought, thereby greatly improving the sulfur-fixing efficiency.

Description

High-efficiency liquid sulfur-fixing catalyst and application thereof

Technical Field

The invention relates to the technical field of kiln tail waste gas emission desulfurization treatment of cement enterprises, in particular to a high-efficiency liquid sulfur-fixing catalyst and application thereof.

Background

SO₂The gas is one of main atmospheric pollutants discharged from a kiln tail chimney in the cement clinker production process of a cement enterprise, is discharged along with flue gas, not only pollutes the atmosphere, but also forms acid rain in the air, harms the growth of animals and plants and the health of human beings, and corrodes metal equipment. Prior to this time, the national leaders have pointed out that ecological environmental issues are both economic and significant social and political issues. From the current national environment protection situation, the environment protection is getting tighter and tighter, the emission requirement of sulfur dioxide of cement enterprises is lower, and the requirement of the former cannot be metAnd the standard cement enterprises are comprehensively upgraded and modified, and the sulfur oxides are controlled to the minimum by a flue gas desulfurization technology. The latest GB 4915-2013 Specification SO of atmospheric pollutant emission Standard of Cement industry in Beijing jin Ji zone, long triangle and bead triangle economic circle of China₂Emission limit of 100mg/Nm³In the key area, 30mg/Nm³. SO of special areas₂The emission limits are more stringent. This makes part of the cement enterprise production line SO₂The emission exceeds the standard; meanwhile, with future large-scale use of inferior raw combustion materials with high sulfur content and alternative mineral raw materials, more sulfur is brought into the production process of cement clinker, which inevitably causes SO₂And (4) excessive exhaust emission. Therefore, the proper desulfurization technology is adopted to control SO₂The exhaust gas emission concentration is the imperative urgent need of the cement enterprises at present and is an important problem facing for a long time.

Therefore, the high-efficiency liquid sulfur-fixing catalyst is provided, so that the technical field of kiln tail waste gas sulfur emission treatment of domestic cement enterprises is widened, the technical approaches are widened, the use cost is reduced, the use operation is simplified, and the high-efficiency liquid sulfur-fixing catalyst is expected to be developed into the mainstream of the cement enterprise desulfurization treatment technology.

Disclosure of Invention

In order to solve the technical problems, the first aspect of the invention provides a high-efficiency liquid sulfur-fixing catalyst, which comprises the following raw materials in parts by weight: 5-21 parts of wetting agent, 2-10 parts of dispersing activator, 25-40 parts of absorbent, 9-19 parts of catalyst, 5-10 parts of combustion improver and 35-45 parts of carrier.

As a preferred technical scheme, the wetting agent is selected from one or more of polyethylene glycol, ethylene glycol, propylene glycol and glycerol.

As a preferred technical scheme, the molecular weight of the polyethylene glycol is 200-1000.

As a preferred technical solution, the absorbent is triethanolamine and/or diethanolamine; preferably, the absorbent is triethanolamine and diethanolamine, wherein the mass ratio of the triethanolamine to the diethanolamine is 1: (1-1.5).

As a preferred technical scheme, the catalyst is a nano metal oxide; preferably, the nano metal oxide is selected from one or more of titanium dioxide, iron oxide and calcium oxide.

As a preferable technical solution, the nano metal oxide is a combination of titanium dioxide, iron oxide and calcium oxide, wherein the mass ratio of titanium dioxide, iron oxide and calcium oxide is 1: 1: (0.5-1.5).

As a preferable technical scheme, the combustion improver is selected from one or more of sodium citrate, urotropine, sodium nitrate and sodium chlorate.

As a preferable technical scheme, the carrier is sodium hydroxide aqueous solution, wherein the mass fraction of sodium hydroxide is 0.05% -0.15%.

The second aspect of the invention provides the application field of the high-efficiency liquid sulfur-fixing catalyst, and the application field belongs to the technical field of kiln tail waste gas emission desulfurization treatment of cement enterprises.

The third aspect of the invention provides a method for using the high-efficiency liquid sulfur-fixing catalyst, which comprises the following steps: putting the cement raw material and the high-efficiency liquid sulfur-fixing catalyst into a preheating system for preheating at the preheating temperature of 300-₃The mass ratio of the sulfur-fixing agent to the sulfur-fixing agent is 1: 0.85, and the desulfurization rate thereof was 97.4% as measured by an on-line gas analyzer.

Has the advantages that: the invention provides a high-efficiency liquid sulfur-fixing catalyst and application thereof, wherein the high-efficiency liquid sulfur-fixing catalyst is combined with the mechanism characteristic of waste gas sulfur generated at the tail of a kiln in clinker production of a cement enterprise, starts from the point of solving the problem in scientificity and economy, starts from the specific process of raw material grinding and raw material preheating, and exerts the force on SO generated in the cement clinker production by adopting a systematic catalytic assistant through an innovative technical thought₂The waste gas is effectively wetted, dispersed, catalytically absorbed and carried to complete a series of combined fist to make SO₂To SO₃Then reacts with catalytic metal factors in the high-efficiency liquid sulfur-fixing catalyst and metal oxides in the raw meal to form sulfate and/or sulfite, and finally is dissolved in the clinker in a solid manner, thereby helping cement enterprises to realize SO₂The waste gas is discharged after reaching the standard in an environment-friendly way, a new way of the desulfurization treatment technology of cement enterprises is widened, the desulfurization cost is reduced, the use and operation are simplified, and the method is expected to be developed into the mainstream of the desulfurization treatment technology of the cement enterprises.

Detailed Description

The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.

When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.

The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.

Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.

In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.

In a preferred embodiment, the high-efficiency liquid sulfur-fixing catalyst of the invention is prepared from at least the following raw materials in parts by weight: 11-19 parts of wetting agent, 5-8 parts of dispersing activator, 30-36 parts of absorbent, 11-17 parts of catalyst, 7-9 parts of combustion improver and 38-43 parts of carrier.

In a most preferred embodiment, the high-efficiency liquid sulfur-fixing catalyst of the present invention is prepared from at least the following raw materials in parts by weight: 15 parts of wetting agent, 7 parts of dispersing activator, 33 parts of absorbent, 14 parts of catalyst, 8 parts of combustion improver and 41 parts of carrier.

The high-efficiency liquid sulfur-fixing catalyst can be preferably added from three positions according to the value of the sulfur emission background of waste gas generated at the tail of a kiln in the cement clinker production of a cement enterprise: the first is cement kiln preheater C2 → C1 rising gas pipeline, the first is raw material homogenizing silo bottom conveying chute entering the position about 1 m from the kiln hopper lifting end, and the other is on the belt conveyor of the raw material limestone blending station; and the optimal adding position point is designed by combining the desulfurization efficiency, the economy and the convenience.

In a preferred embodiment, the doping proportion of the high-efficiency liquid sulfur-fixing catalyst is 0.01-0.2% of the raw material yield.

Wetting agent

The wetting agent of the present invention is a substance that renders solids and/or equivalent particulate materials more susceptible to wetting by water. The solid material is wetted by reducing its surface tension or interfacial tension, allowing water to spread on or penetrate the surface of the solid material.

In a preferred embodiment, the wetting agent of the present invention is selected from one or more of polyethylene glycol, ethylene glycol, propylene glycol, and glycerin.

In a more preferred embodiment, the wetting agent of the present invention is polyethylene glycol.

In a preferred embodiment, the polyethylene glycol of the present invention has a molecular weight of 200-1000.

In a most preferred embodiment, the polyethylene glycol of the present invention has a molecular weight of 600.

The polyethylene glycol is a nonionic water-soluble polymer, is non-toxic and non-irritant, has good water solubility, and has good intermiscibility with a plurality of organic matter components; the surface wettability of the sulfur fixation catalyst on sulfur dioxide gas and sulfur trioxide gas can be effectively improved by adding polyethylene glycol, and the inventor surprisingly discovers that the addition of polyethylene glycol has a synergistic effect with components such as an absorbent, a catalyst, a combustion improver and the like in the sulfur fixation catalyst, so that the sulfur fixation rate of the sulfur fixation catalyst can be effectively improved; the reason for the possibility is that the polyethylene glycol adopted by the invention has certain viscosity, and when the molecular weight of the polyethylene glycol is controlled to be 600, the polyethylene glycol plays a good role in promoting melting in the complex series chemical reaction process of forming sulfate by sulfur and metal elements, so that the sulfur fixation rate is improved.

Dispersion activator

In a preferred embodiment, the dispersion activator is N-methyldiethanolamine and/or diisopropanolamine; preferably, the dispersion activating agent is N-methyldiethanolamine and diisopropanolamine according to a mass ratio of 1: (0.8-1.6) compounding.

In a most preferred embodiment, the dispersion activator of the present invention is N-methyldiethanolamine and diisopropanolamine, wherein the mass ratio of N-methyldiethanolamine to diisopropanolamine is 1: 1.

the diisopropanolamine is white crystalline solid in appearance, can play a role in synergy by being compounded with N-methyldiethanolamine, and the hydroxyl of the diisopropanolamine can reduce vapor pressure and increase solubility in the process of sulfur removal, thereby being beneficial to the absorption of sulfur dioxide gas and further improving the sulfur fixation rate of a sulfur fixing agent.

Absorbent agent

In a preferred embodiment, the absorbent of the present invention is triethanolamine and/or diethanolamine; preferably, the absorbent is triethanolamine and diethanolamine, wherein the mass ratio of the triethanolamine to the diethanolamine is 1: (1-1.5).

In a most preferred embodiment, the absorption catalyst of the present invention is triethanolamine and diethanolamine, wherein the mass ratio of the triethanolamine to the diethanolamine is 1: 1.

the triethanolamine provided by the invention is colorless to light yellow transparent viscous liquid with slight ammonia smell, and becomes colorless to light yellow cubic crystal system crystals at low temperature. When exposed to air, the color gradually darkens. Is easily soluble in water, ethanol, acetone, glycerol, ethylene glycol, etc., is slightly soluble in benzene, diethyl ether, carbon tetrachloride, etc., and is hardly soluble in nonpolar solvents. Can be regarded as trihydroxy substitute of triethylamine. Similar to other amine compounds, because of the lone pair of electrons on the nitrogen atom, triethanolamine has weak alkalinity and can react with inorganic acid or organic acid to generate salt.

The Chinese name of the diethanolamine is 2,2' -dihydroxydiethylamine and diethanolamine; bis-hydroxyethyl amine; 2,2' -iminobisethanol: english abbreviation DEA. Colorless viscous liquid or crystals. It is alkaline and can absorb gases such as carbon dioxide and hydrogen sulfide in air.

The invention can directly remove sulfur in liquid flue gas by adding the absorbent, especially by compounding triethanolamine and diethanolamine, and interacting with other amine compounds in the system, and can efficiently disperse the desulfurization components in the desulfurizer to accelerate the complex desulfurization process, thereby improving the desulfurization efficiency.

The inventor surprisingly finds that the stability of the liquid sulfur-fixing catalyst can be improved through the compound use of the polyethylene glycol, the dispersing activator and the absorbent, so that the product of the invention has stable performance for long-time storage, and the possible reason is that the amine substance and the polyethylene glycol adopted by the invention contain polar groups, can form hydrogen bonds with hydroxyl on the surface of metal oxide, reduce the sedimentation rate of the metal oxide in a water system and improve the storage stability; however, the content of the polyethylene glycol cannot be too much, and if the content of the polyethylene glycol is too much, the net structure in the system is more complex and dense, so that the contact area of the sulfur-fixing catalyst and sulfur dioxide is reduced, and the sulfur-fixing rate is influenced; according to experimental analysis, when the weight ratio of the wetting agent to the dispersion activating agent to the absorbent is (7-10): (5-8): (30-36), the effects are best.

Catalyst and process for preparing same

In a preferred embodiment, the catalyst of the present invention is a metal oxide.

In a preferred embodiment, the metal oxide of the present invention is selected from one or more of titanium dioxide, iron oxide, calcium oxide.

In a more preferred embodiment, the metal oxide of the present invention is a combination of titanium dioxide, iron oxide and calcium oxide, wherein the mass ratio of titanium dioxide, iron oxide and calcium oxide is 1: 1: (0.5-1.5).

In a most preferred embodiment, the metal oxide of the present invention is a combination of titanium dioxide, iron oxide and calcium oxide, wherein the mass ratio of titanium dioxide, iron oxide and calcium oxide is 1: 1: 1.

the added nano oxide has higher surface activity, can quickly react with sulfur dioxide to form a loose porous sulfate structure, and fully reduces the reaction activation energy with the sulfur dioxide, SO that SO generated in the calcining process₂Sulfate solid matters are generated under the action of a catalyst, an oxidant and a sulfur-fixing synergist and are dissolved into cement clinker, so that high-melting-point sulfate with a loose and porous structure is formed more quickly, and the sulfur-fixing efficiency is improved.

Combustion improver

The combustion improver refers to a substance which cannot be combusted per se but can generate oxygen required for combustion. In a broad sense, additives used to improve combustion conditions are combustion improvers. The combustion improver comprises a combustion accelerator, a slurry dispersing agent, a water separating agent, an ash modifier, an emulsifier and a catalyst.

In a preferred embodiment, the combustion improver is one or more selected from sodium citrate, urotropin, sodium nitrate and sodium chlorate.

In a more preferred embodiment, the combustion improver is a combination of sodium citrate, urotropine, sodium nitrate and sodium chlorate, wherein the mass ratio of the sodium citrate to the urotropine to the sodium nitrate to the sodium chlorate is 1: 1: (0.5-1.5): (0.5-1.5).

In a most preferred embodiment, the combustion improver is sodium citrate, urotropin, sodium nitrate, sodium chlorate, wherein the mass ratio of sodium citrate, urotropin, sodium nitrate, sodium chlorate is 1: 1: 1: 1.

the invention adopts the compounding of sodium citrate, urotropine, sodium nitrate and sodium chlorate, effectively improves the sulfur fixation rate of the sulfur fixation catalyst, enlarges the applicable temperature range of the sulfur fixation catalyst, improves the use stability and effectiveness of the sulfur fixation catalyst, and probably because the sodium citrate has the desulfurization effect and can be decomposed at the high temperature of 1450 ℃ to complex metal ions such as calcium ions, magnesium ions and the like; urotropine plays a role in promoting vulcanization, sodium nitrate plays a role in an oxidant at the stage that sulfur dioxide is converted into sulfur trioxide, sodium chlorate releases oxygen at the temperature of more than 300 ℃ to play a role in the oxidant, so that the generation rate of sulfur dioxide to sulfur trioxide is promoted, the sulfur dioxide released from a coal bed to flue gas is effectively captured in time, the key problem that the sulfur fixing agent is in short contact time with the sulfur dioxide and a desulfurizing agent stays for a long time in a high-temperature environment of the coal bed to cause the re-decomposition of a sulfur fixing product is solved, the sulfur fixing efficiency is greatly improved, in addition, sodium ions can also change the structure of the oxide to form a complex network structure, more and larger gaps, larger specific surface area and porosity are formed, transition metal ions can penetrate through the crystal structure and change the structure of the transition metal ions, the continuous diffusion of the sulfur dioxide is facilitated, but also work cooperatively, thereby improving the sulfur fixation rate.

Carrier

In a preferred embodiment, the carrier of the present invention is an aqueous sodium hydroxide solution, wherein the mass fraction of sodium hydroxide is 0.05% to 0.15%.

In a most preferred embodiment, the carrier of the present invention is an aqueous solution of sodium hydroxide, wherein the mass fraction of sodium hydroxide is 0.1%.

A third aspect of the invention provides the use of a high efficiency liquid sulfur-fixing catalystThe application method comprises the following steps: putting the cement raw material and the high-efficiency liquid sulfur-fixing catalyst into a preheating system for preheating at the preheating temperature of 300-₃The mass ratio of the sulfur-fixing agent to the sulfur-fixing agent is 1: 0.85, and the desulfurization rate thereof was 97.4% as measured by an on-line gas analyzer.

Preferably, the MODEL of the online gas analyzer is MODEL 1080.

The fourth aspect of the present invention provides a preparation method of a high-efficiency liquid sulfur-fixing catalyst, which at least comprises the following steps: adding the carrier into a reaction kettle, adding the absorbent and the catalyst into the kettle, stirring for 10-15 minutes, adding the dispersing activator into the kettle, stirring for 10-15 minutes, adding the combustion improver into the kettle, stirring for 15-20 minutes, and finally adding the wetting agent into the kettle, stirring for 10-15 minutes to obtain the catalyst.

It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.

In addition, the raw materials used are commercially available from national chemical reagents, unless otherwise specified.

Examples

In order to better understand the above technical solutions, the following detailed descriptions will be provided with reference to specific embodiments. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention. In addition, the raw materials are commercially available and the extraction methods of the extract are all conventional extraction methods, if not otherwise specified.

Example 1

The high-efficiency liquid sulfur-fixing catalyst is prepared from the following raw materials in parts by weight: 15 parts of wetting agent, 7 parts of dispersing activator, 33 parts of absorbent, 14 parts of catalyst, 8 parts of combustion improver and 41 parts of carrier.

The wetting agent is polyethylene glycol.

The molecular weight of the polyethylene glycol is 600, and the type is PEG-600.

The dispersing activator is N-methyldiethanolamine and diisopropanolamine, wherein the mass ratio of the N-methyldiethanolamine to the diisopropanolamine is 1: 1.

the absorption catalyst comprises triethanolamine and diethanolamine, wherein the mass ratio of the triethanolamine to the diethanolamine is 1: 1.

the metal oxide is a combination of titanium dioxide, ferric oxide and calcium oxide, wherein the mass ratio of the titanium dioxide to the ferric oxide to the calcium oxide is 1: 1: 1.

the combustion improver is sodium citrate, urotropine, sodium nitrate and sodium chlorate, wherein the mass ratio of the sodium citrate to the urotropine to the sodium nitrate to the sodium chlorate is 1: 1: 1: 1.

the carrier is sodium hydroxide aqueous solution, wherein the mass fraction of sodium hydroxide is 0.1%.

The preparation method of the high-efficiency liquid sulfur-fixing catalyst comprises the following steps: adding the carrier into a reaction kettle, adding the absorbent and the catalyst into the kettle, stirring for 15 minutes, adding the dispersing activator into the kettle, stirring for 15 minutes, adding the combustion improver into the kettle, stirring for 18 minutes, and finally adding the wetting agent into the kettle, stirring for 12 minutes to obtain the catalyst.

Example 2

The high-efficiency liquid sulfur-fixing catalyst is prepared from the following raw materials in parts by weight: 5 parts of wetting agent, 2 parts of dispersing activator, 25 parts of absorbent, 9 parts of catalyst, 5 parts of combustion improver and 35 parts of carrier.

The wetting agent is polyethylene glycol.

Example 3

The high-efficiency liquid sulfur-fixing catalyst is prepared from the following raw materials in parts by weight: 21 parts of wetting agent, 10 parts of dispersing activator, 40 parts of absorbent, 19 parts of catalyst, 10 parts of combustion improver and 45 parts of carrier.

The wetting agent is polyethylene glycol.

Example 4

The high-efficiency liquid sulfur-fixing catalyst is prepared from the following raw materials in parts by weight: 30 parts of wetting agent, 7 parts of dispersing activator, 33 parts of absorbent, 14 parts of catalyst, 5 parts of combustion improver and 41 parts of carrier.

The wetting agent is polyethylene glycol.

Example 5

The wetting agent is polyethylene glycol.

The molecular weight of the polyethylene glycol is 2000, and the type is PEG-2000.

Evaluation of Performance

1. The sulfur fixation rate: the high-efficiency liquid sulfur-fixing catalyst prepared in the example 1 is applied to a cement dry kiln, and the sulfur-fixing rate of the sulfur-fixing catalyst is tested when cement raw materials are in a preheating period;

the test method of the sulfur reinforcing agent comprises the following steps: putting cement raw materials and the high-efficiency liquid sulfur-fixing catalyst prepared in the embodiment 1 into a preheating system for preheating, wherein the preheating temperature is 300-; wherein SO is contained in cement raw meal₃The mass ratio of the sulfur-fixing agent to the sulfur-fixing agent is 0.66: 0.85; the test results are given in table 1 below.

The test method of the non-reinforced sulfur agent comprises the following steps: putting the cement raw materials into a preheating system for preheating at the preheating temperature of 300-; the test results are given in table 1 below.

TABLE 1 test results

	Before the sulfur-reinforcing agent	After the sulfur agent is solidified	Sulfur fixation Rate (%)
				Maximum emission value of sulfur (mg/Nm)³)	1056	27	97.3
Minimum emission value of sulfur (mg/Nm)³)	955	24	97.4
				Ammonia slip value (ppm)	8	8	/

2. The sulfur fixation rate: the sulfur maximum emission value and the sulfur fixation rate of the high efficiency liquid sulfur fixation catalyst prepared in examples 2 to 5 were measured by the test method in the performance evaluation 1, and the results are shown in the following table 2.

TABLE 2 test results

	Example 2	Example 3	Example 4	Example 5
					Sulfur fixation Rate (%)	96.2％	95.4％	84.2％	82.1％

3. Stability: the high performance liquid sulfur-fixing catalysts prepared in examples 1 to 5 were protected at room temperature for 14 days, and the appearance of the sulfur-fixing catalysts was visually observed, and the test results are shown in table 3 below.

TABLE 3 test results

	Example 1	Example 2	Example 3	Example 4	Example 5
						Appearance of the product	Suspension liquid	Suspension liquid	Suspension liquid	With precipitation	With precipitation

The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.

Claims

1. The high-efficiency liquid sulfur-fixing catalyst is characterized by comprising the following preparation raw materials in parts by weight: 5-21 parts of wetting agent, 2-10 parts of dispersing activator, 25-40 parts of absorbent, 9-19 parts of catalyst, 5-10 parts of combustion improver and 35-45 parts of carrier.

2. The efficient liquid sulfur-fixing catalyst according to claim 1, wherein the wetting agent is selected from one or more of polyethylene glycol, ethylene glycol, propylene glycol and glycerin.

3. The efficient liquid sulfur-fixing catalyst as claimed in claim 2, wherein the molecular weight of the polyethylene glycol is 200-1000.

4. The high-efficiency liquid sulfur-fixing catalyst according to claim 1, wherein the absorbent is triethanolamine and/or diethanolamine; preferably, the absorbent is triethanolamine and diethanolamine, wherein the mass ratio of the triethanolamine to the diethanolamine is 1: (1-1.5).

5. The high efficiency liquid sulfur-fixing catalyst according to claim 1, wherein the catalyst is a nano metal oxide; preferably, the nano metal oxide is selected from one or more of titanium dioxide, iron oxide and calcium oxide.

6. The efficient liquid sulfur-fixing catalyst according to claim 5, wherein the nano metal oxide is a combination of titanium dioxide, iron oxide and calcium oxide; preferably, the mass ratio of the titanium dioxide to the iron oxide to the calcium oxide is 1: 1: (0.5-1.5).

7. The high-efficiency liquid solid sulfur catalyst according to claim 1, wherein the combustion improver is one or more selected from sodium citrate, urotropin, sodium nitrate and sodium chlorate.

8. The high-efficiency liquid sulfur-fixing catalyst according to claim 1, wherein the carrier is an aqueous solution of sodium hydroxide, wherein the mass fraction of sodium hydroxide is 0.05-0.15%.

9. The application field of the high-efficiency liquid sulfur-fixing catalyst according to any one of claims 1 to 8 is characterized in that the application field is the technical field of kiln tail waste gas emission desulfurization treatment of cement enterprises.

10. The use method of the high-efficiency liquid sulfur-fixing catalyst according to any one of claims 1 to 8, characterized by comprising the following steps: putting the cement raw material and the high-efficiency liquid sulfur-fixing catalyst into a preheating system for preheating at the preheating temperature of 300-₃The mass ratio of the sulfur-fixing agent to the sulfur-fixing agent is 1: 0.85, and the desulfurization rate thereof was 97.4% as measured by an on-line gas analyzer.