CN109824285B - Cement flue gas desulfurizer and application thereof - Google Patents
Cement flue gas desulfurizer and application thereof Download PDFInfo
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Abstract
The invention relates to a cement flue gas desulfurizer and application thereof. The method can apply the industrial waste alkali liquor to cement flue gas desulfurization.
Description
Technical Field
The disclosure relates to a cement flue gas desulfurizer and application thereof.
Background
The cement production is an industry with low energy utilization rate and high energy consumption, and the annual output of 2016 cement in China is 23 hundred million tons, which accounts for more than half of the global output. The cement production process is divided into three stages, namely, a calcareous raw material, a clayey raw material and a small amount of correction raw material (a certain amount of coal is added in the vertical kiln production) are crushed or dried, then are matched and ground according to a certain proportion, and are prepared into raw materials with proper components and uniform quality, which is called as a first stage: grinding the raw materials; then adding the ground raw materials into a cement kiln, calcining until the ground raw materials are partially melted to obtain cement clinker taking calcium silicate as a main component, and referring to a second stage: calcining the raw material; the clinker is added with a proper amount of gypsum and sometimes some mixed materials, and ground into cement together, which is called as a third stage: and (5) grinding the clinker. The cement production process may be referred to simply as: 'two grinding and one burning'.
The conventional desulfurization method, such as limestone-lime/gypsum method, the literature, "Thermal treatment and utilization of fluidized gas desulfurization as an additive in and with respect to environmental and environmental concerns, 2008,22(7), Guo X L" research shows that the complex components of the desulfurization slag of the method cause certain difficulty in treatment and are likely to cause secondary pollution, and have a great influence on ecological environment, and royal sea wave (flue gas desulfurization technology research progress, chemical application; 2013, stage 10) indicates that seawater desulfurization has the characteristics of high efficiency, environmental protection, simple process flow and low operating cost, but the conventional desulfurization method has the characteristics of small sulfur dioxide absorption capacity, large consumption of seawater corrosion equipment, large consumption of seawater, and the like, and the conventional desulfurization method has the characteristics of high efficiency, high investment, low operating cost, high efficiency, high heat transfer rate, low cost, high chemical spray-absorption efficiency, high sulfur absorption efficiency, low heat transfer rate, high absorption efficiency, low operation cost, high sulfur absorption efficiency, low ammonia water absorption rate, high absorption efficiency, low absorption cost of flue gas-liquid-sulfur absorption, low-sulfur-absorption rate, high absorption efficiency, low absorption rate of desulfurization by-efficiency, low absorption rate of ammonia-liquid-sulfur absorption rate, high-absorption rate, high absorption rate.
Cyclohexanone is a basic raw material for producing nylon, and a large amount of organic wastewater is generated in the production process of cyclohexanone. Wherein, the device for preparing cyclohexanone by cyclohexane oxidation method has the generation of organic acid and organic acid ester due to deep oxidation, alkali is needed to be added to neutralize the organic acid in the refining process of the cyclohexanone product, and the treated waste water is called 'saponification waste lye' in the industry. The total amount of the wastewater in the country is about 100 ten thousand tons per year (40% concentration meter), the COD is high, and the biochemical treatment cannot be directly carried out. The currently widely adopted incineration method has the disadvantages of large investment, large energy consumption, certain environmental influence and resource waste. Therefore, the treatment of the saponified waste lye is a great problem in the current nylon raw material industry. The sulfite waste liquid and the soap waste liquid in the paper mill are also industrial waste alkali liquid with higher yield, and the application of the sulfite waste liquid and the soap waste liquid in the cement flue gas desulfurization is also rarely reported.
Disclosure of Invention
The purpose of the present disclosure is to provide a cement flue gas desulfurization agent and an application thereof, and the cement flue gas desulfurization agent provided by the present disclosure can apply industrial waste alkali liquor to cement flue gas desulfurization.
In order to achieve the above object, the present disclosure provides a cement flue gas desulfurization agent, which contains an industrial waste alkali solution and a desulfurization auxiliary agent.
Optionally, the industrial waste lye is at least one selected from saponified waste lye of cyclohexanone production by cyclohexane oxidation, paper mill sulfite waste liquor and soap waste liquor.
Optionally, the saponified waste lye of the cyclohexanone production by cyclohexane oxidation contains 30-90 wt% of water, 5-60 wt% of sodium carboxylate and 0.3-10 wt% of sodium hydroxide, based on the weight of the saponified waste lye of the cyclohexanone production by cyclohexane oxidation.
Optionally, the process for preparing cyclohexanone by oxidizing cyclohexane is at least one selected from a cobalt salt catalytic oxidation method, a boric acid catalytic oxidation method, a titanium silicalite molecular sieve catalytic oxidation method and a catalyst-free oxidation method.
Optionally, the desulfurization auxiliary agent accounts for 0-80 wt%, preferably 1-75 wt%, more preferably 3-70 wt%, and further preferably 10-60 wt% of the cement flue gas desulfurizer; the desulfurization auxiliary agent is at least one selected from sodium hydroxide, potassium hydroxide, calcium oxide, sodium methoxide, sodium acetate and potassium acetate.
Optionally, the paper mill sulfite waste liquor contains 30-80 wt% of water, 5-40 wt% of lignosulfonate and 3-30 wt% of sodium sulfite, based on the total weight of the paper mill sulfite waste liquor.
Optionally, the soap waste liquid contains 30-85 wt% of water, 5-60 wt% of glycerin and 1-10 wt% of sodium chloride based on the total weight of the soap waste liquid.
The disclosure also provides an application of the cement flue gas desulfurizer in the cement production process, wherein the cement flue gas desulfurizer is the cement flue gas desulfurizer provided by the disclosure or the industrial waste alkali liquor provided by the disclosure.
Optionally, the cement flue gas desulfurizer provided by the disclosure or the industrial waste alkali solution provided by the disclosure accounts for 0.08-0.5 wt% of the weight of the cement raw material to be ground.
Optionally, the application comprises adding the cement flue gas desulfurizer into the cement production process in at least one of the following ways:
a. mixing the cement flue gas desulfurizer with the cement raw material to be ground;
b. adding a cement flue gas desulfurizer into a lifting bucket of the cement decomposer;
c. spraying the cement flue gas desulfurizer into a C1-C2 air rising pipe for cement production;
d. the cement flue gas desulfurizer is sprayed into equipment between a blower and a chimney in cement production.
The cement flue gas desulfurizer can be added into a cement raw material grinding system, can improve grinding conditions, is fully and uniformly mixed with calcium carbonate, promotes absorption of sulfur dioxide, and simultaneously sprays a desulfurizer in a mist shape at an air rising pipe of C1-C2 to further reduce the content of the sulfur dioxide. The cement flue gas desulfurizer can solve the problem of reasonable treatment of industrial waste alkali liquids such as saponification waste alkali liquid, paper mill sulfite waste liquid, soap waste liquid and the like in the preparation of cyclohexanone by cyclohexane oxidation, achieves the purposes of cleanness, environmental protection, low cost and comprehensive utilization of resources, can also have good grinding-assisting effect, can improve the yield and reduce the discharge amount of sulfur dioxide.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The present disclosure provides a cement flue gas desulfurizer, which contains industrial waste alkali liquor and a desulfurization auxiliary agent. The industrial waste lye refers to waste liquor discharged by industrial production and having a pH value of more than 7, preferably more than 9, the industrial waste lye is preferably at least one selected from saponification waste lye of cyclohexanone prepared by cyclohexane oxidation, paper mill sulfite waste liquor and soap waste liquor, more preferably saponification waste lye of cyclohexanone prepared by cyclohexane oxidation, further preferably saponification waste lye containing cyclohexanone prepared by cyclohexane oxidation, and optionally other two industrial waste lye.
The cement flue gas desulfurizer (or industrial waste alkali liquor) provided by the disclosure can be used for grinding of cement raw materials to be ground or in other cement production processes by using the internal mixing amount of 0.08-0.5 wt% (based on the weight of the cement raw materials to be ground, the cement flue gas desulfurizer provided by the disclosure or the industrial waste alkali liquor provided by the disclosure accounts for 0.08-0.5 wt%), and the effects of yield improvement and desulfurization can be achieved.
The cement raw material to be ground is well known to those skilled in the art, and refers to a cement raw material before primary grinding in a preparation process of cement double-grinding and single-burning, and can comprise a calcareous raw material, a clayey raw material and a correcting raw material; the calcareous material may be at least one selected from limestone, marl, chalk, shells and coral; the clayey raw material may be at least one selected from loess, clay, shale, mudstone, siltstone and silt; the calibration raw material may be at least one selected from the group consisting of iron ore, copper slag, sandstone, river sand, and siltstone.
In 2016, the total cement yield reaches 23 hundred million tons, the cement raw material amount is 1.6 times of the cement yield, calculated by 0.16 percent of the consumption of a cement flue gas desulfurizer, about 590 million tons of the cement flue gas desulfurizer is needed, the cement raw material is different from the cement clinker, and a grinding aid capable of being used for the cement clinker is generally difficult to be used in the cement raw material for reducing coal consumption and sulfur dioxide discharge.
According to the disclosure, the process for preparing cyclohexanone by oxidizing cyclohexane has more research and faster development since the industrialization in 1961. According to different catalysts, including cobalt salt catalytic oxidation, boric acid catalytic oxidation, titanium silicalite catalytic oxidation and catalyst-free oxidation, although the technological processes have characteristics, the basic principle and the reaction flow are the same, and the specific reaction flow is shown as the following formula:
in the first step, cyclohexane is oxidized in the presence or absence of a catalyst to form cyclohexanone, cyclohexanol and by-products. Taking cobalt naphthenate as an example as a catalyst, the reaction temperature is 160 ℃, the pressure is about 1.08MPa, 5 kettles are connected in series for reaction for 1h, the conversion rate is controlled to be about 5 weight percent by contacting with air, and the selectivity of the cyclohexanol ketone is about 80 weight percent.
In the second step, the product obtained in the first step is subjected to alkaline washing with sodium hydroxide solution to obtain an organic phase containing cyclohexanone and cyclohexanol and an aqueous phase saponification waste lye, which can be used as such, preferably after suitable concentration, and which is generally a black liquid or a partially solid, with a relative density of generally 1.05-1.25 g/ml, and which contains 30-90 wt% of water, 5-60 wt% of sodium carboxylate and 0.3-10 wt% of sodium hydroxide, other salts and organic substances, etc., based on the weight of the saponification waste lye of cyclohexanone produced by oxidation of cyclohexane.
According to the disclosure, the saponified waste alkali solution from the preparation of cyclohexanone by cyclohexane oxidation can be directly used as a cement flue gas desulfurizer for desulfurization without any pretreatment, and the effect of adding a desulfurization auxiliary agent is better. The weight ratio of the saponification waste lye to the desulphurization auxiliary agent for preparing cyclohexanone by cyclohexane oxidation can be 100: (0-1000), preferably 100: (1-600).
According to the present disclosure, the desulfurization aid may be any material that contributes to enhancing desulfurization effect, for example, the desulfurization aid may include at least one selected from the group consisting of sodium hydroxide, potassium hydroxide, calcium oxide, sodium methoxide, sodium acetate, and potassium acetate, but is not limited thereto.
In the present disclosure, the waste liquid of sulfite in paper mill and the waste liquid of soap are well known to those skilled in the art, the waste liquid of sulfite in paper mill refers to waste water from acid pulping, the waste liquid of sulfite in paper mill generally contains 30-80 wt% of water, 5-40 wt% of lignosulfonate and 3-30 wt% of sodium sulfite based on the total weight of the waste liquid of sulfite in paper mill, the waste liquid of soap refers to waste liquid obtained from soap mill and can be used for preparing glycerin, and the waste liquid of soap generally contains 30-85 wt% of water, 5-60 wt% of glycerin and 1-10 wt% of sodium chloride based on the total weight of the waste liquid of soap.
According to the disclosure, the addition of a desulfurization aid to the sulfite waste liquor and the soap waste liquor of a paper mill can also achieve good effects. The weight ratio of the sulfite waste liquid to the desulfurization auxiliary agent and the soap waste liquid to the desulfurization auxiliary agent in the paper mill can be 100: (0-1000), preferably 100: (10-600), the proportion of the saponified waste lye of the cyclohexanone prepared by oxidizing cyclohexane, the paper mill sulfite waste liquor and the soap waste liquor in the cement flue gas desulfurizer can be any ratio.
The disclosure also provides an application of the cement flue gas desulfurizer in the cement production process, wherein the cement flue gas desulfurizer is the cement flue gas desulfurizer provided by the disclosure or the industrial waste alkali liquor provided by the disclosure.
In the present disclosure, the cement flue gas desulfurization agent (or industrial waste lye) can be used in a suitable proportion, for example, the cement flue gas desulfurization agent (or industrial waste lye) provided by the present disclosure can be 0.08-0.5 wt% based on the weight of the cement raw meal to be ground.
In the present disclosure, the cement fume additive may be added to the cement production process in a variety of ways, including, for example, at least one of:
a. mixing the cement flue gas desulfurizer with a cement raw material to be ground, and then grinding, wherein the obtained raw material ground product is roasted, so that the absorption of sulfur dioxide can be promoted by improving the property of the raw material;
b. the cement flue gas desulfurizer is added into a bucket of a cement decomposer, so that the desulfurizer can be absorbed by sulfur dioxide in flue gas in the decomposing furnace;
c. the cement flue gas desulfurizer is sprayed into a C1-C2 air rising pipe for cement production, so that sulfur dioxide in the flue gas can be absorbed, and the cement flue gas desulfurizer can be sprayed in a spraying manner;
d. the cement flue gas desulfurizer is sprayed into equipment between a blower and a chimney in cement production, and can absorb sulfur dioxide in flue gas.
The cement decomposer, the C1-C2 updraft pipes and the cement production blowers and chimneys are all cement production equipment well known to those skilled in the art according to the present disclosure, and the detailed description of the present disclosure is omitted.
Calcination of the raw meal mill product is well known to those skilled in the art in light of this disclosure and refers to feeding the raw meal mill product into a cement rotary kiln for calcination to partial fusion to produce calcium silicate cement clinker (granular or block) having calcium silicate as a major component. The cement flue gas desulfurizer provided by the disclosure can reduce coal consumption and improve energy utilization rate.
The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.
The embodiment of the disclosure uses the saponified waste alkali solution to be taken from the saponified waste alkali solution generated in a cyclohexane oxidation device of caprolactam division of the creeling division, a petrochemical group, in 2017, 8 and 1, wherein the process for preparing cyclohexanone by cyclohexane oxidation is a catalyst-free oxidation method, which is marked as solution a, and the properties of the solution a are as follows: the relative density was 1.197 g/cc, the water content was 42 wt% and the sodium hydroxide content was 2 wt%.
The paper mill sulfite waste liquid and the soap waste liquid are respectively sampled in Yueyang paper mill in 2016 (6 months) and Yue-Yan paper mill in 2017 (8 months) and 6 days in Hunan, and the properties of the paper mill sulfite waste liquid are as follows: the relative density was 1.052 g/cc, and the water content was 40% by weight. The properties of the soap waste liquid are as follows: the relative density was 1.098 g/cc, and the water content was 40% by weight
The desulfurization aid used in the examples was: sodium hydroxide, potassium hydroxide, calcium hydroxide, potassium acetate and sodium acetate are all commercially available products with different brands, and the use is not influenced.
In the embodiment, the mixing proportion of the cement flue gas desulfurizer is cement flue gas desulfurizer/(cement raw material to be ground and cement flue gas desulfurizer).
In the examples, the proportion of the industrial waste alkali solution is industrial waste alkali solution/(industrial waste alkali solution + cement raw material to be ground).
In the examples, the ascending vent pipe C1-C2 calculates the internal mixing proportion of the cement flue gas desulfurizer according to the mist spraying amount (kg/h), wherein the internal mixing proportion is the cement flue gas desulfurizer/(cement raw material to be ground + cement flue gas desulfurizer).
In the examples, the ascending vent pipe C1-C2 calculates the internal mixing ratio of the industrial waste lye in the form of mist spraying amount (kg/h), wherein the internal mixing ratio is the industrial waste lye/(cement grinding raw material + industrial waste lye).
Effect of adding desulfurizing agent in vertical mill
Examples SA1-SA5 and comparative example DA1 illustrate the influence of the presence or absence of a desulfurizing agent for cement fume or an industrial waste lye on the effect of the raw meal grinding and the desulfurization effect.
The experiment is carried out in Huaibei mining bureau-phase mountain cement plant, and the specific operation steps are as follows: feeding cement raw materials to be ground into a vertical mill independently or together with a cement raw material additive or industrial waste alkali liquor to grind the raw materials, wherein the grinding condition of the raw materials is that the fineness is controlled (0.08mm) to be less than 18 weight percent, the statistical mill main current is 190-210 amperes, the grinding pressure is 1.1MPa, the mill outlet temperature is 75-85 ℃, and the circulating fan current is 250 amperes; the raw material grinding product is sent into a kiln system for decomposition and calcination, the calcination condition ensures that the clinker quality is qualified, and the clinker to be ground is obtained by counting the kiln current of 600-700 amperes, the kiln rotation speed of 3.8 revolutions per minute and the decomposition temperature of 880-890 ℃; during the period, the average yield of the raw meal mill, the fineness of the obtained raw meal (the ratio of the sieved weight), the decomposition rate of calcium carbonate during calcination, the average coal consumption and SO were measured2Discharge amount, etc.
It should be noted that: when the vertical mill is stopped (for short, the vertical mill is stopped), tail gas generated by the kiln system does not enter the vertical mill for absorption; when the vertical mill is started, tail gas generated by the kiln system enters the vertical mill for absorption.
Comparative example DA1
The raw materials to be ground of the cement are independently subjected to raw material grinding treatment and calcination, and specific conditions and results are shown in tables 1 and 2.
Example SA1
The liquid A (100 parts by weight) is mixed with cement in the proportion of 0.08 percent by weight to be ground, and the raw materials are ground and calcined, and the specific conditions and results are shown in tables 1 and 2.
Example SA2
The liquid A (100 parts by weight) is mixed with cement in the proportion of 0.2 percent by weight to be ground, and the raw materials are ground and calcined, and the specific conditions and results are shown in tables 1 and 2.
Example SA3
After 20 parts by weight of sodium hydroxide was added to 100 parts by weight of the solution A, the solution A was used as a desulfurizing agent for flue gas from cement, and cement was added to the solution A in an amount of 0.3% by weight to prepare a raw material to be ground, and the raw material was ground and calcined, and the specific conditions and results are shown in tables 1 and 2.
Example SA4
After 10 parts by weight of sodium hydroxide and 20 parts by weight of calcium hydroxide are added to the solution A (100 parts by weight), the solution A is used as a cement flue gas desulfurizer, cement is added into the solution A in a proportion of 0.4% by weight, and raw materials to be ground are ground and calcined, wherein specific conditions and results are shown in tables 1 and 2.
Example SA5
After 10 parts by weight of sodium hydroxide, 20 parts by weight of calcium hydroxide and 20 parts by weight of sodium acetate are added into the solution A (100 parts by weight), the solution A is used as a cement flue gas desulfurizer, cement is added into the solution A according to the proportion of 0.5 weight percent to be ground, and the ground raw material is ground and calcined, wherein the specific conditions and results are shown in tables 1 and 2.
TABLE 1 application data at start of milling
TABLE 2 application data on wear stop
As can be seen from the table 1-2, after a certain amount of desulfurizer or industrial waste lye is added into the raw meal mill, the desulfurization effect is achieved, the yield can be increased, and the desulfurization and yield increase effects are more obvious along with the addition of the amount and the desulfurization auxiliary agent; when the mill is started and stopped, the highest desulfurization amount can exceed 50 percent. Because the contact area and the contact time of the desulfurizer or the industrial waste alkali liquor are limited, the desulfurizer or the industrial waste alkali liquor which is not fully utilized in the raw material mill enters the subsequent process along with the raw material, the continuous desulfurization effect is realized, and the problem of over standard sulfur emission caused by stopping the raw material mill is avoided. In addition, the desulfurizer can improve the burnability of raw materials, thereby reducing coal consumption.
Examples SB1-SB3 and comparative example DA1 illustrate the effect of the desulfurization agent for cement flue gas on the desulfurization effect of cement flue gas when the mill is stopped.
Example SB1
After 20 parts by weight of sodium hydroxide, 30 parts by weight of calcium hydroxide and 20 parts by weight of sodium acetate are added to the solution A (100 parts by weight), the solution A is used as a cement flue gas desulfurizer, cement is added into the solution A in a proportion of 0.5% by weight, and raw materials to be ground are ground and calcined, wherein specific conditions and results are shown in Table 3.
Example SB2
The waste sulfite liquor (100 weight portions) of paper mill is added with 10 weight portions of potassium hydroxide, 20 weight portions of calcium oxide and 20 weight portions of potassium acetate to be used as desulfurizing agent for cement flue gas, and then the cement flue gas is mixed with cement according to the proportion of 0.5 weight percent to be ground to obtain raw material, and the raw material is ground and calcined, and the specific conditions and results are shown in table 3.
Example SB3
After adding 10 parts by weight of potassium hydroxide, 10 parts by weight of calcium oxide and 10 parts by weight of potassium acetate into the soap waste liquid (100 parts by weight), the soap waste liquid is used as a cement flue gas desulfurizer, cement is added into the cement waste liquid according to the proportion of 0.5 weight percent to be ground, and the cement waste liquid is subjected to raw material grinding treatment and calcination, wherein specific conditions and results are shown in table 3.
TABLE 3 application data at wear stop
As can be seen from Table 3, the saponification waste lye of cyclohexanone production by cyclohexane oxidation, the paper mill sulfite waste liquor and the soap waste liquor can be used for desulfurization and reducing coal consumption after being matched with desulfurization auxiliary agent.
Secondly, when the mill is stopped, the influence of the desulfurizer added at the ascending air pipe of C1-C2 on the desulfurization
Examples SC1-SC5 and comparative example DA1 illustrate the effect of the addition of a desulfurizing agent at the uptake duct of C1-C2 on desulfurization at the time of mill-break, examples SC1-SC5 desulfurizing agent and industrial waste lye correspond to examples SA1-SA5, respectively. The details are shown in Table 4.
TABLE 4
As can be seen from Table 4, in other processes in the cement production process, such as the up-draft pipe C1-C2, the functions of desulfurization and coal consumption reduction can be achieved, the addition of the desulfurizer in the process flow behind the raw material warehouse has the characteristic of quick effect, and the use of small mixing amount can emergently treat the problem of over-standard sulfur.
As can be seen from tables 1-4, the cement flue gas desulfurization agent and the industrial waste lye provided by the present disclosure have good desulfurization effect, and can also play a role in increasing the yield and reducing the coal consumption.
Although the present disclosure has been described in detail hereinabove with respect to general description, specific embodiments and experiments, it will be apparent to those skilled in the art that some modifications or improvements may be made based on the present disclosure. Accordingly, such modifications and improvements are intended to be within the scope of this disclosure, as claimed.
Claims (8)
1. A cement flue gas desulfurizer used in the cement production process comprises industrial waste alkali liquor and a desulfurization auxiliary agent; wherein the industrial waste lye is at least one of saponified waste lye from cyclohexanone preparation by cyclohexane oxidation, paper mill sulfite waste liquor and soap waste liquor;
the cement production process comprises at least one of the following modes:
a. mixing the cement flue gas desulfurizer with the cement raw material to be ground;
b. adding a cement flue gas desulfurizer into a lifting bucket of the cement decomposer;
c. the cement flue gas desulfurizer is sprayed into a C1-C2 air rising pipe for cement production.
2. The cement flue gas desulfurization agent according to claim 1, wherein the saponified waste lye of cyclohexane oxidation-cyclohexanone contains 30-90 wt% of water, 5-60 wt% of sodium carboxylate and 0.3-10 wt% of sodium hydroxide, based on the weight of the saponified waste lye of cyclohexane oxidation-cyclohexanone.
3. The cement flue gas desulfurization agent according to claim 1, wherein the process for preparing cyclohexanone by oxidation of cyclohexane is at least one selected from a cobalt salt catalytic oxidation method, a boric acid catalytic oxidation method, a titanium silicalite molecular sieve catalytic oxidation method, and a catalyst-free oxidation method.
4. The cement flue gas desulfurization agent according to claim 1, wherein the desulfurization auxiliary agent accounts for 80 wt% or less of the cement flue gas desulfurization agent; the desulfurization auxiliary agent is at least one selected from sodium hydroxide, potassium hydroxide, calcium oxide, sodium methoxide, sodium acetate and potassium acetate.
5. The desulfurizing agent for cement flue gas according to claim 1, wherein the paper mill sulfite waste liquor contains 30 to 80% by weight of water, 5 to 40% by weight of lignosulfonate and 3 to 30% by weight of sodium sulfite, based on the total weight of the paper mill sulfite waste liquor.
6. The cement flue gas desulfurization agent according to claim 1, wherein the soap waste liquid contains 30 to 85 wt% of water, 5 to 60 wt% of glycerin, and 1 to 10 wt% of sodium chloride, based on the total weight of the soap waste liquid.
7. The application of a cement flue gas desulfurizer in the cement production process, wherein the cement flue gas desulfurizer is the cement flue gas desulfurizer described in any one of claims 1 to 6;
the application in the cement production process comprises at least one of the following modes:
a. mixing the cement flue gas desulfurizer with the cement raw material to be ground;
b. adding a cement flue gas desulfurizer into a lifting bucket of the cement decomposer;
c. the cement flue gas desulfurizer is sprayed into a C1-C2 air rising pipe for cement production.
8. The use according to claim 7, wherein the cement flue gas desulfurization agent according to any one of claims 1 to 6 is contained in an amount of 0.08 to 0.5% by weight based on the weight of the cement raw meal to be ground.
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| CN102949924A (en) * | 2011-08-31 | 2013-03-06 | 中国石油化工股份有限公司 | Method for applying petrochemical exhausted lye to semidry-method flue gas desulfurization |
| CN109824284A (en) * | 2017-11-23 | 2019-05-31 | 湖南昌迪环境科技有限公司 | A kind of cement slurry additive and its application and cement production process |
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