JP2001276566A - Method for manufacturing exhaust gas treatment agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of manufacturing an exhaust gas treatment agent having high desalting and desulfurizing effect more inexpensively and easily than before. SOLUTION: The method for manufacturing the exhaust gas treatment agent includes a process for adding water to 100 parts by weight of a mixture, which consists of 50-99.9 parts by weight of quick lime and 0.01-50 parts by weight of silicon dioxide, in a stoichiometric amount for converting quick lime to slaked lime of water and adding 10-200 parts by weight of a solvent for dispersing the mixture to 100 parts by weight of the mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a flue gas treating agent, and more particularly to a method for producing a flue gas treating agent for removing acidic gas from flue gas accompanying incineration of general refuse.

[0002]

2. Description of the Related Art Conventionally, as a relatively inexpensive flue gas treatment method, slaked lime is sprayed in a flue through which flue gas passes.
Harmful acid gas in the flue gas is adsorbed to slaked lime, and the slaked lime adsorbed by the acid gas is collected by a dust collector, and then the collected material is disposed of as a managed waste such as landfill. Has been done.

Further, the inventors of the present invention have
A flue gas treating agent for efficiently removing NO _x and SO _x contained in flue gas discharged by burning fossil fuel such as coal at a power plant is disclosed in, for example, Reference 1 (Japanese Unexamined Patent Application Publication No.
-76808). According to the flue gas treatment agent of Document 1, calcium oxide, silicon dioxide, aluminum oxide and gypsum are contained as raw materials. The method for producing a flue gas treating agent comprises the steps of: adding a substance containing amorphous silicon dioxide in quicklime to silicon dioxide in an amount of 0.05 to 6 as silicon dioxide per 100 parts by weight of calcium oxide in quicklime.
0 parts by weight, water is added to cause a digestion reaction, and then a substance containing aluminum oxide, gypsum, and, if necessary, silicon dioxide is mixed and kneaded so as to have a predetermined flue gas treatment composition. It is characterized by. High desulfurization (desulfurization) is achieved by the flue gas treating agent thus produced.
O _x) and denitrification (de NO _x) effect.

[0004]

Here, attention is paid to toxic gas contained in flue gas discharged from a garbage incinerator for general garbage and the like. During the flue gas emitted from general garbage incinerators,
HCl and SO _x are contained in large amounts as toxic gases. The slaked lime conventionally used does not have so high adsorption performance for acid gas, especially SO ₂ gas. Therefore, in order to adsorb a large amount of acid gas, the spray amount of slaked lime becomes enormous. For this reason, the amount of waste disposal increases, and the cost for this treatment increases.

[0005] Further, the flue gas treating agent of Document 1 is manufactured for the purpose of removing SO _x and NO _x emitted with the combustion of fossil fuel. If this flue gas treatment agent is used for the flue gas treatment of a general garbage incinerator, it exhibits a high desalination (HCl removal) effect, and even if the amount of waste disposal can be reduced, Due to the high production cost of the treatment agent, the cost of the entire flue gas treatment becomes high.

[0006] For this reason, there has been a demand for a method for producing a flue gas treating agent capable of easily producing a flue gas treating agent having a high desalting and desulfurizing effect at lower cost and easier than before. Then, as such a flue gas treating agent, the appearance of a flue gas treating agent having a particularly high calcium content and capable of adsorbing SO ₂ efficiently has been desired.

[0007]

According to the method for producing a flue gas treating agent of the present invention, a mixture 100 containing 50 to 99.9 parts by weight of quick lime and 0.01 to 50 parts by weight of silicon dioxide is provided. It is characterized by including a step of adding, based on parts by weight, a stoichiometric amount of water for converting quicklime into slaked lime and 10 to 200 parts by weight of a solvent in which the mixture is dispersed.

The above mixture contains 50 to 99.9 parts by weight of quicklime and 0.01 to 50 parts by weight of silicon dioxide out of 100 parts by weight of the mixture. Then, based on 100 parts by weight of the mixture, a stoichiometric amount of water for converting quicklime into slaked lime and a solvent 10 for dispersing the mixture are used.
~ 200 parts by weight.

The mixture may be one obtained by mixing quick lime and a silicon dioxide-containing substance containing silicon dioxide, or may be one that has been mixed in advance. In addition, the solvent herein refers to a liquid in which the mixture is dispersed, and is distinguished from stoichiometric water used in the digestion reaction to convert quicklime into slaked lime. As the solvent, a mixed solution of water and an organic solvent, an aqueous solution of the additive in which the additive is dissolved, a solution in which the additive is dissolved in the mixed solution, or only water is used.

[0010] Thus, quicklime can be digested without fear of indigestion. In addition, amorphous calcium silicate can be generated by reacting quick lime and silicon dioxide using the heat of digestion generated during the digestion of quick lime, and the calcium silicate can be contained in the obtained slaked lime. Thereby, a flue gas treating agent having a high desalting and desulfurizing effect can be obtained.
In addition, the above digestion reaction and the reaction for forming calcium silicate can be carried out simply by adding water necessary for digestion and a solvent for dispersion to a mixture of quicklime and silicon dioxide-containing material. Therefore, it is not necessary to heat the reaction system by applying heat from the outside as in the conventional case. Therefore, the cost and time required for manufacturing can be reduced as compared with the related art.

Preferably, in the method for producing a flue gas treating agent of the present invention, the silicon dioxide-containing substance is mixed so that silicon dioxide is contained in an amount of 1 to 20 parts by weight in the mixture.

Since the flue gas treating agent produced by the method of the present invention starts from a mixture of quicklime and a substance containing silicon dioxide, the calcium content of this treating agent can be obtained by digesting only quicklime. Slightly lower than slaked lime. For this reason, in order to secure the content of calcium that reacts with the acid gas, it is considered necessary to increase the spray amount of the flue gas treatment agent sprayed into the flue. By containing in such a ratio, a high desalination effect can be obtained without increasing the spray amount of the flue gas treating agent, and a higher desulfurization effect than before can be obtained.

In the method for producing a flue gas treating agent, preferably, a solvent for decomposing the mixture is added in such an amount that it is evaporated by the heat of digestion of quick lime and does not remain in the flue gas treating agent at the end of the reaction.

As a result of reacting a mixture of quicklime and a substance containing silicon dioxide in a state of being dispersed in a solvent, slaked lime and calcium silicate having relatively large pore diameters can be produced. Further, a higher desulfurization effect can be obtained by the flue gas treating agent having a large pore diameter. Also, since the solvent used for dispersion is added in an amount that evaporates due to heat of digestion, it is not necessary to dry the treating agent after the reaction. Therefore, the cost and manufacturing time required for the manufacturing process of the flue gas treating agent can be further reduced.

As the solvent for dispersion, a mixed solution of water and an organic solvent is preferably used. It is preferable that the amount of the mixed solution is not less than 10 parts by weight and not more than 100 parts by weight.

Thus, quicklime can be efficiently dispersed, and moisture and an organic solvent can be evaporated by digestion heat during a digestion reaction. Therefore, a powdery flue gas treating agent having a large pore diameter can be obtained easily and at low cost without performing a drying treatment. As the organic solvent, for example, glycols such as ethylene glycol, diethylene glycol, propylene glycol and glycerin, amines such as monoethanolamine, diethanolamine and triethanolamine, and alcohols such as methyl alcohol, ethyl alcohol and isopropyl alcohol are used. Can be.

Regarding the effect of the organic solvent, the evaporation of the organic solvent is prioritized during the digestion reaction. As a result, the effect of improving the dispersibility of quick lime in water and the effect that the organic solvent directly delays the evaporation of water. And the effect of improving dispersibility in water is considered, but glycols are considered to have a large effect of the latter effect. The effect of amines is considered to be almost the latter. It is considered that the effect of the former effect is great for alcohols.

Preferably, the amount of the organic solvent in the solvent is not more than twice the volume of water in the solvent. The water in the solvent is added for the purpose of preventing the water used in the digestion reaction from evaporating due to digestion heat and causing indigestion.

Further, an aqueous solution of an additive in which an additive is dissolved in water may be used as a solvent for dispersion. The amount of the aqueous solution is preferably set to 10 parts by weight or more and 100 parts by weight or less. Further, the additive in the aqueous solution is preferably dissolved in the range of 0.1 to 20 parts by weight based on 100 parts by weight of the mixture.

This aqueous solution has a function of delaying the evaporation of the stoichiometric amount of water required for the digestion reaction. This allows the reaction to proceed smoothly. Therefore,
A powdery flue gas treating agent having a large pore diameter can be obtained easily and at low cost without performing a drying treatment. As the additive, for example, citric acid or saccharides such as sucrose, glucose, and sorbitol can be used.

Further, as a solvent for dispersing quicklime and delaying evaporation of water, one selected from the above-mentioned organic solvents can be used.
A solution in which one or more additives selected from the above additives are dissolved in a mixed solution of one or more organic solvents and water, or a mixed solution of an organic solvent and water and the additives. A solution in which a dissolved additive aqueous solution is mixed may be used. Thereby, the same operation and effect can be obtained as in the case where the solvent is a mixed solution of the above-mentioned organic solvent and water and the case where the solvent is an additive aqueous solution.

Further, water may be used as a solvent for dispersion. Then, when the amount of water is, for example, 100 parts by weight of the mixture, it is preferable that the amount be 70 parts by weight or more and less than 200 parts by weight.

Thus, quicklime can be dispersed in a sufficient amount of solvent. So there is no danger of indigestion,
Quicklime can be changed to slaked lime. However, in this case, it is necessary to perform a drying treatment after the digestion reaction.

When water is used as the solvent for dispersion, the amount may be 10 to 70 parts by weight per 100 parts by weight of the mixture. At this time, for example, by making the particle size of the quick lime used as a starting material smaller, it is possible to suppress an instantaneous digestion reaction from occurring. Thereby, the timing of generation of heat generated by the digestion reaction is adjusted, and the time required for water evaporation can be extended. Therefore, the occurrence of indigestion can be suppressed, and the digestion reaction can be performed with a sufficient amount of water. As a result,
A flue gas treatment agent having desired performance can be obtained. Further, if the amount of water is as described above, it is not necessary to perform a drying treatment on the obtained reaction product.

[0025]

Embodiments of the present invention will be described below.

As a starting material for producing the flue gas treatment agent of the present invention, quicklime can be a commercially available product.

As the starting material containing silicon dioxide, a compound containing reactive silicon dioxide can be used. As such a compound, for example,
Examples include hydrated silicon, aluminum metasilicate, calcium silicate, and water glass. Natural products may be used as the silicon dioxide-containing material. Examples of natural products include cristobalite, tridymite, kaolin, bentonite, talc, perlite, zeolite, shirasu, diatomaceous earth, volcanic ash, and kira. In addition, by-products may be used as the silicon dioxide-containing material. Examples of this by-product include blast furnace slag, coal ash, used flue gas treatment agents, and waste glass.

In the production of the flue gas treating agent of this embodiment, first, quick lime and a substance containing silicon dioxide are put in a reaction vessel and mixed. Next, a stoichiometric amount of water for converting quicklime into slaked lime and a solvent for dispersing the mixture are added to the mixture.

Since quicklime and water react at a molar ratio of 1: 1, the stoichiometric amount of water for converting quicklime to slaked lime is 32 when the amount of quicklime is 100 parts by weight. 0.1 part by weight. The solvent for dispersion is added in the range of 10 to 200 parts by weight, based on 100 parts by weight of the mixture. As the solvent, water or a mixture of water and alcohol can be used. In this embodiment, for example, 10 to 10
A mixed solution of water and an organic solvent in an amount within 0 parts by weight is used.

In the reaction vessel, quicklime reacts with water and changes to slaked lime. And this reaction generates digestive fever. In addition, quick lime and silicon dioxide undergo a hydrothermal reaction due to the heat of digestion to generate calcium silicate. here,
Since the amount of the dispersing solvent and the particle size of the quicklime are set as described above, the calorific value of the generated heat of digestion can be left to the extent that a hydrothermal reaction is possible. Therefore, calcium silicate can be generated by causing quick lime and silicon dioxide to react well without performing a heat treatment for a hydrothermal reaction from the outside. Further, the solvent for dispersion can be evaporated by the heat of digestion. Thereby, slaked lime in which amorphous calcium silicate is partially formed is obtained in a dry powder state. This powder has a large pore size because the quicklime is digested with a dispersing solvent with good dispersibility. Further, since the obtained powder is in a state where it can be used as a flue gas treatment agent as it is, there is no need to perform a drying treatment.

The flue gas treating agent thus obtained is converted into harmful HC in exhaust gas discharged by incineration of general waste.
It is used for removing 1 gas and SO ₂ gas. First, HCl
Gas to form a CaCl ₂ adsorbed and reacted on slaked lime and calcium silicates. For this reason, in the flue gas treating agent manufactured by the above-mentioned method, the specific surface area to which the HCl gas is adsorbed is large, so that the desalination performance is higher than before. Also, SO ₂ gas is adsorbed via a complicated reaction mechanism. Briefly, SO ₂ is oxidized to CaSO ₄ and immobilized. Then, this oxide immobilization required NO _x, NO _x is oxidized active species SO _2. Here, the flue gas treating agent of this embodiment partially contains calcium silicate. The calcium silicate is particularly likely to absorb NO _x. For this reason,
This flue gas treatment agent can significantly improve the desulfurization effect as compared with slaked lime containing no calcium silicate.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the method for producing a flue gas treating agent of the present invention will be described below with reference to the accompanying drawings, along with comparative examples. It should be noted that the drawings merely schematically show the shapes, sizes, and arrangements of the components so that the present invention can be understood, and thus the present invention is not limited to the illustrated examples. It should also be understood that numerical conditions such as materials used, amounts of each material, and the like mentioned in the following description are merely examples within the scope of the present invention.

In each of the following examples, about 400 g of a flue gas treating agent is experimentally produced using a mortar mixer, and the characteristics of the treating agent are examined. In addition, its performance is evaluated. The production of the flue gas treatment agent of the present invention which is actually performed is a continuous production using a conventional production apparatus for producing slaked lime by digesting quick lime, and a production in which a large amount of treatment agent is obtained. It is believed that there is little difference in properties or performance between the experimentally obtained treating agent and the treating agent manufactured using conventional equipment.

In Example 1, commercially available quick lime and coal ash as a material containing silicon dioxide are used as starting materials. Then, water is used as a solvent, and a mixture 100 of quicklime and coal ash is used.
Production is performed by preparing 192.3 parts by weight per part by weight.

In the second embodiment, as in the first embodiment, commercially available quick lime and coal ash are used as starting materials, and an aqueous citric acid solution is used as a solvent. In Examples 2-1 to 2-3, the treatment agent is manufactured by changing the amount of the citric acid aqueous solution.

In Example 3, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and an aqueous sucrose solution is used as a solvent. In Examples 3-1 to 3-3, the treatment agent is manufactured by changing the concentration of the sucrose and the amount of the aqueous sucrose solution.

In Example 4, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and an aqueous glucose solution is used as a solvent. In Examples 4-1 to 4-3, the treatment agent is manufactured by changing the concentration of glucose and the amount of the aqueous glucose solution.

In Example 5, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and a sorbitol aqueous solution is used as a solvent. In Examples 5-1 to 5-3, the treatment agent is manufactured by changing the concentration of the sorbitol and the amount of the aqueous sorbitol solution.

In Example 6, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and a mixed solution of water and EG (ethylene glycol) is used as a solvent. In Examples 6-1 to 6-3, the processing agent is manufactured by changing the amount of EG.

In Example 7, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and a mixed solution of water and DEG (diethylene glycol) is used as a solvent. In Examples 7-1 to 7-3, the processing agent is manufactured by changing the amount of DEG.

In Example 8, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and a mixed solution of water and PG (propylene glycol) is used as a solvent.
In Examples 8-1 to 8-3, the processing agent is manufactured by changing the amount of PG.

In Example 9, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and a mixed solution of water and MEA (monoethanolamine) is used as a solvent. In Examples 9-1 to 9-3, the treatment agent is manufactured by changing the amount of MEA.

In Example 10, as in Example 1, commercially available quicklime and coal ash are used as starting materials, and a mixed solution of water and DEA (diethanolamine) is used as a solvent. In Examples 10-1 to 10-3, the processing agent is manufactured by changing the amount of DEA.

In Example 11, similarly to Example 1, commercially available quick lime and coal ash are used as starting materials, and a mixed solution of water and TEA (triethanolamine) is used as a solvent. In Examples 11-1 to 11-3, the treatment agent is manufactured by changing the amount of TEA.

In Example 12, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and a mixed solution of water and MA (methyl alcohol) is used as a solvent. In Examples 12-1 to 12-3, the processing agent is manufactured by changing the amount of MA.

In Example 13, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and a mixed solution of water and EA (ethyl alcohol) is used as a solvent. In Examples 13-1 to 13-3, the treatment agent is manufactured by changing the amount of EA.

In Example 14, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and a mixed solution of water and IPA (isopropyl alcohol) is used as a solvent. In Examples 14-1 to 14-3, IPA
, And the treatment agent is manufactured.

Example 15 uses commercial quicklime and zeolite as a silicon dioxide-containing material as starting materials. Water is prepared as a solvent.

In Example 16, as in Example 15, commercially available quick lime and zeolite are used as starting materials. A mixed solution of water and IPA is used as a solvent. Then, in Examples 16-1 and 16-2, the mixed solutions are manufactured with different IPA contents.

In Example 17, commercially available quick lime and glass powder as a substance containing silicon dioxide are used as starting materials. Further, water was prepared as a solvent, and Examples 17-1 to 17-
In No. 3, production is performed with different amounts of water.

In Example 18, similarly to Example 17, commercially available quick lime and glass powder are used as starting materials. A mixed solution of water and IPA is used as a solvent. And in Examples 18-1 and 18-2, they are manufactured so that the IPA content in the mixed solution is different.

In Example 19, commercially available quick lime having a smaller particle size than that of Example 1 and coal ash as a silicon dioxide-containing material are used as starting materials. Then, only water is prepared as a solvent. The amount of water is between 10 and 70 parts by weight per 100 parts by weight of the mixture of quicklime and coal ash. In Examples 19-1 to 19-3, the amount of water as a solvent is changed to manufacture a treating agent.

In Example 20, as in Example 1, commercially available quick lime and coal ash are used as starting materials, and a solution obtained by mixing an aqueous sorbitol solution and triethanolamine (TEA) as a solvent is used. Then, in Examples 20-1 and 20-2, the concentration of sorbitol aqueous solution and T
The treatment agent is manufactured by changing the amount of EA.

As Comparative Example 1, a special slaked lime (made by Hokkaido Kyodo Lime Co., Ltd.) which has been conventionally used as a flue gas treatment agent is prepared. As Comparative Example 2, highly reactive slaked lime is prepared.

<Example 1> First, commercially available quick lime having a particle size of 2 to 4 mm (manufactured by Ueda Lime Manufacturing Co., Ltd.), for example, coal ash and water as silicon dioxide-containing materials are prepared.

272 g of the above quicklime (about 87.2 parts by weight)
And 40 g of ground coal ash (containing about 20 g (about 6.4 parts by weight) of silicon dioxide) are mixed in a mortar mixer. After the quicklime and coal ash have been mixed approximately uniformly, 688 g of 70 ° C. water is slowly added to the mortar mixer while stirring the mixture. The water is 88 g of stoichiometric water for digesting quicklime and 600 g of water as a solvent for dispersing the mixture (about 192.3 parts by weight of the mixture).
Add together.

As a result, quicklime is digested into slaked lime. During this digestion, digestive heat is generated. Also, due to this heat of digestion, quicklime and coal ash undergo a hydrothermal reaction on the surface of quicklime to form calcium silicate. In addition, part of the water added for dispersion is evaporated by the heat of digestion. In this example, since the reaction product contains a lot of water, the reaction product is subjected to a drying treatment at a temperature of 160 ° C. for 3 hours using a hot air dryer as a drying unit. As a result, about 400 g of the flue gas treating agent of Example 1 is obtained.

<Example 2> As Example 2, an example in which the solvent in which the mixture is dispersed is different from that of Example 1 will be described. In Example 2, a citric acid aqueous solution in which citric acid as an additive is dissolved is used as a solvent. Example 1
A detailed description of the same points as will be omitted.

(2-1) 272 g of quicklime (manufactured by Ueda Lime Mfg. Co., Ltd.) as in Example 1 and pulverized coal ash 40
g in a mortar mixer, and the mixture is mixed at 70 ° C. with a citric acid concentration of 0.25% by weight.
160 g of an aqueous citric acid solution is slowly added while stirring the mixture. Then, in addition to the citric acid aqueous solution, 88 g of a stoichiometric amount of water for digesting quicklime is added to the mortar mixer.

As a result, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is produced by a hydrothermal reaction between quicklime and silicon dioxide in coal ash using the heat of digestion generated during the digestion of quicklime. The citric acid aqueous solution has an action of delaying evaporation of the stoichiometric amount of water necessary for the digestion reaction due to the heat of digestion of quicklime. Therefore, there is no possibility that the digestion reaction becomes insufficient. Finally, the aqueous citric acid solution evaporates due to heat of digestion. For this reason, the obtained reaction product becomes a powder.

(2-2) After mixing quicklime and coal ash in a mortar mixer, a solvent added to the mortar mixer is a citric acid aqueous solution having a citric acid concentration of 10% by weight.
Except for 80 g, the same as (2-1) above. Thereby, a powdery reaction product is obtained.

(2-3) After mixing quicklime and coal ash in a mortar mixer, a solvent to be added to the mortar mixer is a citric acid aqueous solution having a citric acid concentration of 20% by weight.
Except that the amount is set to 00 g, the same as (2-1) is performed. Thereby, a powdery reaction product is obtained.

In the production of the flue gas treating agent of Example 2, the hydrothermal reaction for producing calcium silicate can be performed without applying external heat. In addition, the solvent (aqueous citric acid solution) added for dispersing the mixture of quicklime and coal ash is also evaporated by the heat of digestion, so it is not necessary to dry the slaked lime containing calcium silicate using drying means. Absent. Therefore,
The flue gas treatment agent can be manufactured very inexpensively and easily.

<Example 3> As Example 3, an example in which additives are different from Example 2 will be described. In this example, sucrose is used as an additive. Therefore, the solvent for dispersing the mixture is an aqueous sucrose solution in which sucrose is dissolved. The detailed description of the same points as in the first and second embodiments is omitted.

(3-1) 272 g of quick lime (manufactured by Ueda Lime Mfg. Co., Ltd.) similar to that of Example 1 and pulverized coal ash 40
g in a mortar mixer, 160 g of an aqueous sucrose solution at 70 ° C. and a sucrose concentration of 0.25% by weight are gradually added to the mortar mixer while stirring the mixture. Into the mortar mixer, in addition to the aqueous sucrose solution, 88 g of water having a stoichiometric amount of water for digesting quicklime is added.

As a result, about 400 g of slaked lime partially formed with calcium silicate is obtained. The aqueous sucrose solution has a function of delaying evaporation of stoichiometric water required for the digestion reaction due to the heat of digestion of quicklime. Therefore, there is no possibility that the digestion reaction becomes insufficient. Finally, the aqueous sucrose solution evaporates due to heat of digestion. As a result, the obtained reaction product is in a powder form.

(3-2) After mixing quicklime and coal ash in a mortar mixer, the solvent to be added to the mortar mixer is the same as the above (3) except that the concentration of sucrose is 180 g of a 10% by weight aqueous sucrose solution. Same as -1). Thereby, a powdery reaction product is obtained.

(3-3) After mixing quicklime and coal ash in a mortar mixer, the solvent to be added to the mortar mixer is the same as the above (3) except that 200 g of an aqueous sucrose solution having a sucrose concentration of 20% by weight is used. Same as -1). Thereby, a powdery reaction product is obtained.

Example 4 As Example 4, an example in which an additive used in an aqueous additive solution used as a solvent for dispersing a mixture is different from Examples 2 and 3 will be described. In this example, glucose is used as an additive. The detailed description of the same points as in the first to third embodiments is omitted.

(4-1) In place of the aqueous sucrose solution of (3-1) of Example 3, 160 g of an aqueous glucose solution having a glucose concentration of 0.25% by weight is used.

(4-2) In place of the aqueous sucrose solution of (3-2) of Example 3, 180 g of an aqueous glucose solution having a glucose concentration of 10% by weight is used.

(4-3) In place of the aqueous sucrose solution of (3-3) in Example 3, 200 g of an aqueous glucose solution having a glucose concentration of 20% by weight was used.

Thus, in the examples (4-1), (4-2) and (4-3), about 400 g of slaked lime partially formed with calcium silicate is obtained. The aqueous glucose solution has an action of delaying evaporation of stoichiometric water required for the digestion reaction due to the heat of digestion of quicklime. Therefore, there is no possibility that the digestion reaction becomes insufficient. Finally, the aqueous glucose solution evaporates due to the heat of digestion. As a result, the obtained reaction product is in a powder form.

<Example 5> As Example 5, an example in which an additive used in an aqueous additive solution used as a solvent for dispersing a mixture is different from Examples 2 to 4 will be described.
In this example, sorbitol is used as an additive. The detailed description of the same points as in the first to fourth embodiments is omitted.

(5-1) Instead of the aqueous sucrose solution of (3-1) in Example 3, the concentration of sorbitol was 0.25% by weight.
160 g of an aqueous solution of sorbitol.

(5-2) In place of the aqueous sucrose solution of (3-2) in Example 3, 180 g of an aqueous sorbitol solution having a sorbitol concentration of 10% by weight is used.

(5-3) Instead of the aqueous sucrose solution of (3-3) in Example 3, 200 g of an aqueous sorbitol solution having a sorbitol concentration of 20% by weight was used.

As a result, in Examples (5-1), (5-2) and (5-3), about 400 g of slaked lime partially formed with calcium silicate is obtained. The sorbitol aqueous solution has a function of delaying evaporation of the stoichiometric amount of water necessary for the digestion reaction due to the heat of digestion of quicklime. Therefore, there is no possibility that the digestion reaction becomes insufficient. Finally, the aqueous sorbitol solution evaporates due to heat of digestion. As a result, the obtained reaction product is in a powder form.

<Example 6> As Example 6, an example in which the solvent in which the mixture is dispersed is a mixed solution of water and an organic solvent will be described. In this example, EG (ethylene glycol) is used as the organic solvent. Note that detailed descriptions of the same points as in the first embodiment are omitted.

(6-1) 272 g of quicklime (manufactured by Ueda Lime Mfg. Co., Ltd.) as in Example 1 and pulverized coal ash 40
g in a mortar mixer, a mixed solution of water and EG at 70 ° C. is gradually added into the mortar mixer while stirring the mixture. The mixed solution is a mixture of 88 ml of stoichiometric water for digesting quicklime and 160.4 ml of the mixed solution as a solvent. The mixed solution as a solvent was composed of 160 ml of water and EG0.
4 ml (water: EG = 1: 0.0025 (volume ratio)).

As a result, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is generated by a hydrothermal reaction between quicklime and silicon dioxide in coal ash using the heat of digestion generated during the digestion of quicklime. The mixed solution has a function of delaying evaporation of the stoichiometric amount of water in the mixed solution due to the heat of digestion of quicklime. Therefore, the digestion reaction can be performed with a sufficient amount of water. Also, due to the heat of digestion, the mixed solution of water and EG added for dispersing the mixture evaporates. For this reason, the obtained reaction product becomes a powder.

(6-2) After mixing quicklime and coal ash in a mortar mixer, a solvent to be added to the mortar mixer is mixed with 160 ml of water and 40 ml of EG (water:
Except that EG = 1: 0.25 (volume ratio), the same as (6-1) above. Thereby, a powdery reaction product is obtained.

(6-3) After mixing quicklime and coal ash in a mortar mixer, a solvent to be added to the mortar mixer is a mixed solution of 160 ml of water and 80 ml of EG (water:
EG = 1: 0.5 (volume ratio)) except that (6
Same as -1). Thereby, a powdery reaction product is obtained.

<Example 7> As Example 7, an example in which the organic solvent used in the mixed solution used as the solvent for dispersing the mixture is a glycol different from that in Example 6 will be described. In this example, DEG (diethylene glycol) is used as the organic solvent. The detailed description of the same points as in the first to sixth embodiments is omitted.

(7-1) In place of EG in the mixed solution of (6-1) in Example 6, 0.4 ml of DEG is used.

(7-2) In place of EG in the mixed solution of (6-2) in Example 6, 40 ml of DEG is used.

(7-3) In place of EG in the mixed solution of (6-3) in Example 6, 80 ml of DEG is used.

Thus, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is generated by a hydrothermal reaction between quicklime and silicon dioxide in coal ash using the heat of digestion generated during the digestion of quicklime. The mixed solution has a function of delaying evaporation of the stoichiometric amount of water in the mixed solution due to the heat of digestion of quicklime. Therefore, the digestion reaction can be performed with a sufficient amount of water. Also, due to the heat of digestion, the mixed solution of water and DEG added for dispersing the mixture evaporates. For this reason, the obtained reaction product becomes a powder.

Example 8 As Example 8, an example in which the organic solvent used in the mixed solution used as the solvent for dispersing the mixture is a glycol different from Examples 6 and 7 will be described. In this example, PG is used as the organic solvent.
(Propylene glycol). In addition, Examples 1 to
A detailed description of the same points as 7 will be omitted.

(8-1) 0.4 ml of PG is used instead of EG in the mixed solution of (6-1) in Example 6.

(8-2) 40 ml of PG is used instead of EG in the mixed solution of (6-2) in Example 6.

(8-3) Instead of EG in the mixed solution of (6-3) in Example 6, 80 ml of PG is used.

Thus, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is generated by a hydrothermal reaction between quicklime and silicon dioxide in coal ash using the heat of digestion generated during the digestion of quicklime. The mixed solution has a function of delaying evaporation of the stoichiometric amount of water in the mixed solution due to the heat of digestion of quicklime. Therefore, the digestion reaction can be performed with a sufficient amount of water. The mixed solution of water and PG added for dispersing the mixture evaporates due to heat of digestion. For this reason, the obtained reaction product becomes a powder.

<Example 9> As Example 9, an example in which the solvent in which the mixture is dispersed is a mixed solution of water and an organic solvent different from Examples 6 to 8 will be described. In this example, MEA (monoethanolamine) is used as the organic solvent. Note that detailed descriptions of the same points as in the first embodiment are omitted.

(9-1) 272 g of quicklime (manufactured by Ueda Lime Mfg. Co., Ltd.) similar to that in Example 1 and pulverized coal ash 40
g in a mortar mixer, a mixed solution of water and MEA at 70 ° C. is gradually added into the mortar mixer while stirring the mixture. The mixed solution is a mixture of 88 ml of stoichiometric water for digesting quicklime and 160.4 ml of the mixed solution as a solvent. A mixed solution as a solvent is composed of 160 ml of water and MEA.
0.4 ml (water: MEA = 1: 0.0025 (volume ratio)).

Thus, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is generated by a hydrothermal reaction between quicklime and silicon dioxide in coal ash using the heat of digestion generated during the digestion of quicklime. The mixed solution has a function of delaying evaporation of the stoichiometric amount of water in the mixed solution due to the heat of digestion of quicklime. Therefore, the digestion reaction can be performed with a sufficient amount of water. Further, the mixed solution of water and MEA added for dispersing the mixture evaporates due to heat of digestion. For this reason, the obtained reaction product becomes a powder.

(9-2) After mixing quicklime and coal ash in a mortar mixer, a solvent to be added to the mortar mixer is a mixed solution of 160 ml of water and 20 ml of MEA (water: MEA = 1: 0.125 ( Except for (volume ratio)), the same as (9-1) above. Thereby, a powdery reaction product is obtained.

(9-3) After mixing quicklime and coal ash in a mortar mixer, a solvent to be added to the mortar mixer is a mixed solution of 160 ml of water and 40 ml of MEA (water: MEA = 1: 0.25 ( Except for (volume ratio)), the same as (9-1) above. Thereby, a powdery reaction product is obtained.

Example 10 As Example 10, an example will be described in which the organic solvent used in the mixed solution used as the solvent for dispersing the mixture is ethanolamines different from that in Example 9. In this example, the organic solvent is DE
A (diethanolamine) is used. In addition, Examples 1 to
A detailed description of the same points as in No. 9 is omitted.

(10-1) 0.4 ml of DEA is used instead of MEA in the mixed solution of (9-1) in Example 9.

(10-2) Instead of MEA in the mixed solution of (9-2) in Example 9, 20 ml of DEA is used.

(10-3) In place of MEA in the mixed solution of (9-3) in Example 9, 40 ml of DEA is used.

As a result, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is generated by a hydrothermal reaction between quicklime and silicon dioxide in coal ash using the heat of digestion generated during the digestion of quicklime. The mixed solution has a function of delaying evaporation of the stoichiometric amount of water in the mixed solution due to the heat of digestion of quicklime. Therefore, the digestion reaction can be performed with a sufficient amount of water. Also, due to the heat of digestion, the mixed solution of water and DEA added for dispersing the mixture evaporates. For this reason, the obtained reaction product becomes a powder.

<Example 11> As Example 11, an example will be described in which the organic solvent used in the mixed solution used as the solvent for dispersing the mixture is ethanolamines different from Examples 9 and 10. In this example, TEA (triethanolamine) is used as the organic solvent. In addition, about the same point as Example 1-10, the detailed description is abbreviate | omitted.

(11-1) In place of MEA in the mixed solution of (9-1) in Example 9, 0.4 ml of TEA is used.

(11-2) In place of MEA in the mixed solution of (9-2) in Example 9, 20 ml of TEA is used.

(11-3) In place of MEA in the mixed solution of (9-3) in Example 9, 40 ml of TEA is used.

As a result, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is generated by a hydrothermal reaction between quicklime and silicon dioxide in coal ash using the heat of digestion generated during the digestion of quicklime. The mixed solution has a function of delaying evaporation of the stoichiometric amount of water in the mixed solution due to the heat of digestion of quicklime. Therefore, the digestion reaction can be performed with a sufficient amount of water. Also, due to heat of digestion, the mixed solution of water and TEA added for dispersing the mixture evaporates. For this reason, the obtained reaction product becomes a powder.

Example 12 As Example 12, an example will be described in which the solvent in which the mixture is dispersed is a mixed solution of water and an organic solvent different from Examples 6 to 11. In this example, MA (methyl alcohol) is used as the organic solvent. Note that detailed descriptions of the same points as in the first embodiment are omitted.

(12-1) 272 g of quicklime (made by Ueda Lime Mfg. Co., Ltd.) as in Example 1 and pulverized coal ash 4
After mixing 0 g in a mortar mixer, a mixed solution of water and MA at 70 ° C. is gradually added to the mortar mixer while stirring the mixture. The mixed solution is a mixture of 88 ml of stoichiometric water for digesting quicklime and 150 ml of the mixed solution as a solvent.
The mixed solution as a solvent is 60 ml of water and 90 ml of MA.
(Water: MA = 1: 1.5 (volume ratio)).

Thus, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is generated by a hydrothermal reaction between quicklime and silicon dioxide in coal ash using the heat of digestion generated during the digestion of quicklime. The organic solvent in the mixed solution is
Evaporates before water. Thereby, evaporation of water required for the digestion reaction can be delayed. Therefore, quicklime can be dispersed in a sufficient amount of water,
The digestion reaction can be performed without causing indigestion. Further, due to heat of digestion, the mixed solution of water and MA added for dispersing the mixture evaporates. For this reason, the obtained reaction product becomes a powder.

(12-2) After mixing quicklime and coal ash in a mortar mixer, a solvent to be added to the mortar mixer is a mixed solution of 80 ml of water and 120 ml of MA (water: MA = 1: 1.5 ( Except for (volume ratio)), the procedure is the same as (12-1). Thereby, a powdery reaction product is obtained.

(12-3) After mixing quicklime and coal ash in a mortar mixer, a solvent to be added to the mortar mixer is a mixed solution of 120 ml of water and 180 ml of MA (water: MA = 1: 1.5 ( Except for (volume ratio)), the procedure is the same as (12-1). Thereby, a powdery reaction product is obtained.

<Example 13> As Example 13, an example in which the organic solvent used in the mixed solution used as the solvent for dispersing the mixture is alcohol different from that in Example 12 will be described. In this example, EA (ethyl alcohol) is used as the organic solvent. In addition, about the same point as Example 1-12, the detailed description is abbreviate | omitted.

(13-1) 90 ml of EA is used instead of MA in the mixed solution of (12-1) in Example 12.

(13-2) Instead of MA in the mixed solution of (12-2) of Example 12, 120 ml of EA was used.

(13-3) 180 ml of EA was used instead of MA in the mixed solution of (12-3) in Example 12.

As a result, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is generated by a hydrothermal reaction between quicklime and silicon dioxide in coal ash using the heat of digestion generated during the digestion of quicklime. The organic solvent in the mixed solution is
Evaporates before water. Thereby, evaporation of water required for the digestion reaction can be delayed. Therefore, quicklime can be dispersed in a sufficient amount of water,
The digestion reaction can be performed without causing indigestion. Further, the mixed solution of water and EA added for dispersing the mixture evaporates due to heat of digestion. For this reason, the obtained reaction product becomes a powder.

Example 14 As Example 14, an example in which the organic solvent used in the mixed solution used as the solvent for dispersing the mixture is an alcohol different from Examples 12 and 13 will be described. In this example, IPA (isopropyl alcohol) is used as the organic solvent. In addition,
The detailed description of the same points as in the first to thirteenth embodiments will be omitted.

(14-1) 90 ml of IPA is used in place of MA in the mixed solution of (12-1) in Example 12.

(14-2) In place of MA in the mixed solution of (12-2) in Example 12, 120 ml of IPA was used.

(14-3) In place of MA in the mixed solution of (12-3) in Example 12, 180 ml of IPA was used.

(14-4) After mixing quicklime and coal ash in a mortar mixer, a solvent to be added to the mortar mixer is a mixed solution of 140 ml of water and 210 ml of IPA (water: IPA = 1: 1.5 ( Volume ratio))
Same as (12-1) above.

As a result, in each of the above examples (14-1 to 4), about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate utilizes the heat of digestion generated during the digestion of quicklime,
It is produced by a hydrothermal reaction between quicklime and silicon dioxide in coal ash. The organic solvent in the mixed solution evaporates before water. Thereby, evaporation of water required for the digestion reaction can be delayed. Therefore, quicklime can be dispersed in a sufficient amount of water, and thereby a digestion reaction can be performed without causing indigestion. In addition, water and IP added for dispersing the mixture by digestion heat
The mixed solution with A evaporates. For this reason, the obtained reaction product becomes a powder.

<Embodiment 15> In Embodiment 15, Embodiment 1 will be described.
14 to 14 are examples in which a silicon dioxide-containing material as a starting material for production is different.

First, 272 g of quicklime similar to that in Example 1 was used.
(About 87.2 parts by weight) and 40 g of ground zeolite
(Containing about 24 g (about 7.7 parts by weight) of silicon dioxide) in a mortar mixer. After the quicklime and the zeolite are almost uniformly mixed, the mixture is placed in a mortar mixer at 70 ° C.
688 g of water are slowly added while stirring the mixture.
The water is a stoichiometric amount of water 8 to digest quicklime.
8 g and water 600 g as a solvent for dispersing the mixture
(About 192.3 parts by weight of the mixture).

Next, the obtained reaction product is dried at 160 ° C. for 3 hours using a hot air drier. As a result, the powdery flue gas treating agent of Example 15 was reduced to about 4%.
00 g are obtained.

<Example 16> As Example 16, an example will be described in which the solvent in which the mixture is dispersed is different from Example 15 described above. In Example 16, a mixed solution of water and IPA is used as a solvent. Note that detailed description of the same points as in the fifteenth embodiment is omitted.

(16-1) Quicklime 2 similar to Example 15
After mixing 72 g and 40 g of the ground zeolite in a mortar mixer, 238 ml of a mixed solution of water and IPA at 70 ° C. are gradually added into the mortar mixer while stirring the mixture. This mixed solution contains 88 ml of stoichiometric water for digesting quicklime, and a mixed solution of 60 ml of water as a solvent and 90 ml of IPA (water: IPA = 1: 1.5 (volume ratio)). In.

Thus, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is generated by a hydrothermal reaction between quicklime and silicon dioxide in zeolite using the heat of digestion generated during the digestion of quicklime. The solvent composed of a mixed solution of water and IPA has an effect of delaying evaporation of the stoichiometric amount of water in the aqueous solution due to heat of digestion of quicklime and an effect of improving dispersibility of quicklime during the digestion reaction. Have. Thereby, the digestion reaction proceeds smoothly, and finally the solvent evaporates due to the heat of digestion. For this reason, the obtained reaction product becomes a powder without performing a drying treatment.

(16-2) After mixing quicklime and zeolite in a mortar mixer, a solvent to be added to the mortar mixer is a mixed solution of 80 ml of water and 120 ml of IPA (water: IPA = 1: 1.5 (volume)). Ratio)), except that (16-1) is used. Thereby, a powdery reaction product is obtained.

(16-3) After mixing quicklime and zeolite in a mortar mixer, a solvent to be added to the mortar mixer is a mixed solution of 120 ml of water and 180 ml of IPA (water: IPA = 1: 1.5 (volume)). Ratio)), except that (16-1) is used. Thereby, a powdery reaction product is obtained.

In the production of the flue gas treating agent of Example 16, the hydrothermal reaction for producing calcium silicate can be performed without applying external heat. Further, the solvent (mixed solution of water and IPA) added to disperse the mixture of quicklime and coal ash is also evaporated by the heat of digestion, and thus the slaked lime containing calcium silicate obtained is dried using a drying means. No need to dry.
Therefore, the flue gas treating agent can be produced very inexpensively and easily.

<Embodiment 17> In Embodiment 17, Embodiment 1 will be described.
16 to 16 are examples in which the content of silicon dioxide as a starting material for the production is different.

(17-1) First, 272 g (about 87.2 parts by weight) of quicklime similar to that in Example 1 and 40 g of ground glass powder (containing about 30 g (about 9.6 parts by weight) of silicon dioxide) In a mortar mixer. After the quicklime and the glass powder are mixed approximately uniformly, 7 is added to the mortar mixer.
408 g of water at 0 ° C. are slowly added while stirring the mixture. The water comprises 88 g of stoichiometric water for digesting quicklime and 320 g of water as a solvent for dispersing the mixture.
g (about 102.5 parts by weight of the mixture).

Next, the obtained reaction product is dried at a temperature of 160 ° C. for 3 hours using a hot air drier. As a result, about 400 g of the powdery flue gas treating agent of Example (17-1) is obtained.

(17-2) After mixing quicklime and glass powder in a mortar mixer, smoke was discharged in the same manner as in (17-1) except that the amount of water added to the mortar mixer was 488 g. Manufacturing treatment agent. The amount of water (488
g) is the combined amount of 88 g of water for digesting quicklime and 400 g of water as a solvent (about 128.2 parts by weight of the mixture). Thereby, a powdery reaction product is obtained.

(17-3) After mixing quicklime and glass powder in a mortar mixer, smoke was discharged in the same manner as in (17-1) except that the amount of water added to the mortar mixer was 688 g. Manufacturing treatment agent. The amount of water (688
g) is the combined amount of 88 g of water for digesting quicklime and 600 g of water as a solvent (about 192.3 parts by weight of the mixture). Thereby, a powdery reaction product is obtained.

<Embodiment 18> In Embodiment 18, Embodiment 1 will be described.
Similarly to 7, glass powder is used as a silicon dioxide-containing material that is a starting material for production, and a mixed solution of water and IPA is used as a solvent for dispersing a mixture of the glass powder and quicklime.

(18-1) Quicklime 27 similar to Example 1
After mixing 2 g and 40 g of ground glass powder in a mortar mixer, water and 70 ° C.
The mixed solution with PA is gradually added while stirring the mixture. The mixed solution is a combination of 88 ml of water required for digesting quicklime and a mixed solution of water and IPA as a solvent. The mixed solution as a solvent is a mixture of 80 ml of water and 120 ml of IPA (water: IPA = 1: 1.5 (volume ratio)). As a result, the powdery flue gas treating agent of Example 18-1 was reduced to about 400.
g is obtained.

(18-2) After mixing quicklime and glass powder in a mortar mixer, a solvent to be added to the mortar mixer is a mixed solution of 120 ml of water and 120 ml of IPA (water: IPA = 1: 1 (volume ratio: )), Except that (18-1) is used. Thereby, a powdery reaction product is obtained.

As a result, (18-1) and (18-
In the example 2), about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is generated by a hydrothermal reaction between quicklime and silicon dioxide in glass powder using the heat of digestion generated during the digestion of quicklime. The solvent composed of a mixed solution of water and IPA has an effect of delaying evaporation of the stoichiometric amount of water in the aqueous solution due to heat of digestion of quicklime and an effect of improving dispersibility of quicklime during the digestion reaction. Have. Thereby, the digestion reaction proceeds smoothly, and finally the solvent evaporates due to the heat of digestion. For this reason, the obtained reaction product becomes a powder without performing a drying treatment.

<Example 19> As Example 19, commercially available quicklime having a particle size of 0.25 mm or less (manufactured by Ueda Lime Manufacturing Co., Ltd.), coal ash as a silicon dioxide-containing material, and water were used. prepare. An example in which the amount of water is smaller than that in the first embodiment and there is no need to perform a drying process will be described.

(19-1) 272 g of the above quicklime (about 8
(7.2 parts by weight) and 40 g of pulverized coal ash (containing about 20 g (about 6.4 parts by weight) of silicon dioxide) are mixed in a mortar mixer. Thereafter, 208 g of water at 70 ° C. are slowly added to the mortar mixer while stirring the mixture. The water is a stoichiometric amount of water 8 to digest quicklime.
8 g and 120 g of water as a solvent for dispersing the mixture
(About 38.5 parts by weight per 100 parts by weight of the mixture). After sufficiently stirring, a reaction product obtained by releasing heat in an air atmosphere at room temperature is used as a treating agent of Example 19-1. As a result, about 400 g of powdered slaked lime partially formed with calcium silicate is obtained.

(19-2) After mixing quicklime and coal ash in a mortar mixer, the same operation as in (19-1) is performed except that the amount of water added to the mortar mixer is 248 g. The amount of water (248 g) is the total amount of 88 g of water for digesting quicklime and 160 g of water as a solvent (51.3 parts by weight per 100 parts by weight of the mixture). Thereby, a powdery reaction product is obtained.

(19-3) After mixing quicklime and coal ash in a mortar mixer, the procedure is the same as in the above (19-1) except that the amount of water added to the mortar mixer is 288 g. The amount of water (288 g) is the total amount of 88 g of water for digesting quicklime and 200 g of water as a solvent (64.1 parts by weight per 100 parts by weight of the mixture). Thereby, a powdery reaction product is obtained.

Example 20 As Example 20, an example in which the solvent in which the mixture is dispersed is a solution obtained by mixing a mixed solution of an organic solvent and water with an aqueous solution of an additive will be described. In this example, triethanolamine (TEA) is used as an organic solvent, and sorbitol is used as an additive. Note that detailed descriptions of the same points as in the first embodiment are omitted.

(20-1) 272 g of quicklime (manufactured by Ueda Lime Mfg. Co., Ltd.) as in Example 1 and pulverized coal ash 4
After mixing in a mortar mixer at 70 ° C. and a sorbitol concentration of 0.1 g.
160 g of a 25% by weight aqueous sorbitol solution and TEA20
ml and slowly add the solution while stirring the mixture. In addition to this solution, 88 g of stoichiometric water for digesting quicklime is added to the mortar mixer.

Thus, about 400 g of slaked lime partially formed with calcium silicate is obtained. Calcium silicate is produced by a hydrothermal reaction between quicklime and silicon dioxide in coal ash using the heat of digestion generated during the digestion of quicklime. The solution used as the solvent has a function of delaying evaporation of the stoichiometric amount of water in the solution due to the heat of digestion of quicklime. Therefore, there is no possibility that the digestion reaction becomes insufficient. Finally, the solution evaporates due to heat of digestion. For this reason, the obtained reaction product becomes a powder.

(20-2) After mixing quicklime and coal ash in a mortar mixer, the solvent added to the mortar mixer was 180 g of an aqueous sorbitol solution having a sorbitol concentration of 10% by weight, and the amount of TEA was 0.1%. Except for 4 ml, the same as (20-1) above. This allows
A powdery reaction product is obtained.

<Comparative Example 1> As Comparative Example 1, a special name slaked lime (trade name: manufactured by Hokkaido Kyodo Lime Co., Ltd.) is prepared.

Comparative Example 2 As Comparative Example 2, highly reactive slaked lime was prepared.

(Performance test of flue gas treating agent) Next, a performance test is carried out for each of the flue gas treating agents obtained in Examples 1 to 20 described above. Here, the desulfurization performance of the flue gas treating agent is tested using the test apparatus shown in FIG. 1 by a powder-dispersed filling gas distribution system using absorbent cotton.

The test apparatus 10 includes the electric furnace 12 and the electric furnace 1
A reaction tube 14 installed in the reaction tube 2, absorbent cotton 16 packed in the reaction tube 14, a gas concentration measuring device 18 for measuring the concentration of each gas in the exhaust gas from the reaction tube 14, and a flow meter, respectively. A plurality of gas cylinders 2 having 20a to 20e
2a to 22e, a humidifier 24, a mixer 26 for mixing the steam from the humidifier 24 with the gas from the gas cylinders 22a to 22e, and a gas supply for supplying the mixed gas from the mixer 26 to the reaction tube 14. Tube 28 (FIG. 1).

Here, as the gas cylinders 22a to 22e, a gas cylinder 22a of SO ₂ gas, a gas cylinder 22b of NO gas, a gas cylinder 22c of CO ₂ gas, a gas cylinder 22d of O ₂ gas, and a gas cylinder 22e of N ₂ gas are prepared. Then, the concentrations of the respective gases in the mixed gas supplied to the reaction tube 14 are set to the following concentrations.

SO ₂ : 2250 ppm, NO: 700 p
_{pm, CO 2: 13%,} O 2: 6%, H 2 O: 10%. The gas concentrations are adjusted using N ₂ gas.

Further, the gas flow rate of this mixed gas was set to 1 l (liter) / min, and the gas passage time to the reaction tube 14 was set to 4 hours.
0 hours. In addition, heating is performed by the electric furnace 12 so that the temperature inside the reaction tube 14 becomes 130 ° C. In addition, 25 g of a flue gas treating agent is dispersed in the absorbent cotton 16 packed in the reaction tube 14.

Under the above conditions, the mixed gas was supplied to the reaction tube 1
After passing through 4 for 40 hours, the treating agent dispersed in the absorbent cotton is taken out. Thereafter, the content of S (sulfur) in the treatment agent is measured by a CS meter using the IR method. As the CS meter, for example, EMIA2000 (trade name: manufactured by Horiba, Ltd.) is used. SO ₂ in the mixed gas reacts with Ca (calcium) in the flue gas treatment agent to generate CaSO ₄ (calcium sulfate). This calcium sulfate is made of absorbent cotton 1
6 in the treating agent that has absorbed SO ₂
By measuring the amount, the calcium utilization rate (%) of the flue gas treating agent can be obtained. This calcium utilization indicates the desulfurization performance. Therefore, it can be said that the desulfurization performance is higher as the calcium utilization rate is higher.

The specific surface area of each of the flue gas treating agents of Examples 1 to 20 was measured, and the pore volume and the average pore diameter of some of the treating agents were also measured. here,
The specific surface area is measured by the BET method, and the pore volume and the average pore diameter are measured by the BJH method.

As a result of the desulfurization performance test, the values of the specific surface area, the pore volume and the average pore diameter are shown in Tables 1 to 7 below together with the production conditions (starting materials and solvents) of each Example.

[0161]

[Table 1]

[0162]

[Table 2]

[0163]

[Table 3]

[0164]

[Table 4]

[0165]

[Table 5]

[0166]

[Table 6]

[0167]

[Table 7]

Table 1 shows Example 1 using only water as a solvent and Example 2 using an aqueous citric acid solution as a solvent.
Shows the results.

According to Table 1, the calcium utilization of the treating agent of Example 1 was 66%, the specific surface area was 25 m ² / g, the pore volume was 0.163 cm ³ / g, and the average pore diameter was 13.5 nm.
Met.

In Example 2 using an aqueous citric acid solution as a solvent, according to Table 1, the calcium utilization of the treating agent of Example 2-1 was 37% and the specific surface area was 29 m ^2.
/ G, the pore volume was 0.113 cm ³ / g, and the average pore diameter was 11.3 nm. The calcium utilization of the treating agent of Example 2-2 was 38%, and the specific surface area was 28 m ² / g. The calcium utilization of the treating agent of Example 2-3 was 36.
%, Specific surface area is 28 m ² / g, pore volume is 0.124 c
m ³ / g, and the average pore diameter was 11.5 nm.

Table 2 is an example using an aqueous solution of an additive as a solvent, and shows the results of Examples 3, 4 and 5 using a saccharide as an additive.

In Example 3 using an aqueous sucrose solution as a solvent, referring to Table 2, the treating agent of Example 3-1 had a calcium utilization of 34% and a specific surface area of 26 m ² / g.
The pore volume is 0.075 cm ³ / g, and the average pore diameter is 10.
It was 2 nm. The calcium utilization of the treating agent of Example 3-2 was 30%, and the specific surface area was 23 m ² / g. The calcium utilization of the treating agent of Example 3-3 was 27%, and the specific surface area was 20 m ² / g.

In Example 4 using an aqueous glucose solution as a solvent, according to Table 2, the treating agent of Example 4-1 had a calcium utilization of 33% and a specific surface area of 24 m.
² / g, the pore volume was 0.069 cm ³ / g, and the average pore diameter was 10.5 nm. The calcium utilization of the treating agent of Example 4-2 was 32%, and the specific surface area was 19 m ² / g. The calcium utilization of the treating agent of Example 4-3 is 29%.
And the specific surface area was 18 m ² / g.

In Example 5 in which an aqueous sorbitol solution was used as the solvent, according to Table 2, Example 5-1 was used.
Of the treating agent has a calcium utilization of 34% and a specific surface area of 29.
m ² / g, pore volume was 0.079 cm ³ / g, and average pore diameter was 10.8 nm. The calcium utilization of the treating agent of Example 5-2 was 30%, and the specific surface area was 20 m ² / g. The calcium utilization of the treating agent of Example 5-3 is 29%.
The specific surface area was 19 m ² / g.

Table 3 is an example using a mixed solution of water and an organic solvent as a solvent, and shows the results of Examples 6, 7 and 8 using glycols as an organic solvent.

In Example 6 using EG as the organic solvent, referring to Table 3, the treating agent of Example 6-1 had a calcium utilization of 47%, a specific surface area of 26 m ² / g, and a pore volume of 0.155 cm ³ / g, average pore size is 11.0
nm. The calcium utilization of the treating agent of Example 6-2 was 50%, the specific surface area was 26 m ² / g, and the pore volume was 0.1%.
157 cm ³ / g and average pore diameter was 11.2 nm. The calcium utilization of the treating agent of Example 6-3 is 57%.
Has a specific surface area of 26 m ² / g and a pore volume of 0.175 c.
m ³ / g, and average pore diameter was 11.4 nm.

In Example 7 using DEG as the organic solvent, according to Table 3, the treating agent of Example 7-1 had a calcium utilization of 40% and a specific surface area of 24 m ² / g.
Met. The calcium utilization of the treating agent of Example 7-2 was 44%, the specific surface area was 23 m ² / g, and the pore volume was 0.15.
1 cm ³ / g and average pore diameter was 11.8 nm. The calcium utilization of the treating agent of Example 7-3 was 51%, and the specific surface area was 23 m ² / g.

In Example 8 using PG as the organic solvent, according to Table 3, the treating agent of Example 8-1 had a calcium utilization of 38% and a specific surface area of 23 m ² / g. . The calcium utilization of the treating agent of Example 8-2 was 4
0%, specific surface area 23 m ² / g, pore volume 0.144
cm ³ / g, and the average pore diameter was 10.9 nm. The calcium utilization of the treating agent of Example 8-3 was 46%, and the specific surface area was 23 m ² / g.

Table 4 is an example using a mixed solution of water and an organic solvent as the solvent, and shows the results of Examples 9, 10 and 11 using ethanolamines as the organic solvent.

In Example 9 using MEA as the organic solvent, referring to Table 4, the treating agent of Example 9-1 had a calcium utilization of 43% and a specific surface area of 35 m ² / g. The calcium utilization of the treating agent of Example 9-2 was 4
7%, specific surface area 30 m ² / g, pore volume 0.180
cm ³ / g, and the average pore diameter was 10.0 nm. The calcium utilization of the treating agent of Example 9-3 was 50%, and the specific surface area was 28 m ² / g.

In Example 10 using DEA as the organic solvent, the treating agent of Example 10-1 had a calcium utilization of 41% and a specific surface area of 44 m ² / g.
The calcium utilization of the treating agent of Example 10-2 was 45%,
The specific surface area is 40 m ² / g, and the pore volume is 0.172 cm ³ /
g, the average pore diameter was 9.6 nm. Example 10-3
Has a calcium utilization of 49% and a specific surface area of 3%.
It was 7 m ² / g.

In Example 11 using TEA as the organic solvent, the treating agent of Example 11-1 had a calcium utilization of 40%, a specific surface area of 40 m ² / g, and a pore volume of 0.155 cm ^3. / G, average pore diameter was 8.2 nm. The calcium utilization of the treating agent of Example 11-2 was 4
1%, specific surface area 42 m ² / g, pore volume 0.151
cm ³ / g, and the average pore diameter was 8.2 nm. The calcium utilization of the treating agent of Example 11-3 was 48%, and the specific surface area was 48 m ² / g.

Table 5 is an example using a mixed solution of water and an organic solvent as the solvent, and shows the results of Examples 12, 13 and 14 using alcohols as the organic solvent.

Example 12 using MA as an organic solvent
In the following, referring to Table 5, the treating agent of Example 12-1
Has a calcium utilization of 59% and a specific surface area of 31m^Two/ G
Met. Calcium utilization of the treating agent of Example 12-2
Is 61%, specific surface area is 30m ^Two/ G, pore volume is 0.1
61cm^Three/ G, average pore diameter was 13.9 nm.
The calcium utilization of the treating agent of Example 12-3 was 63%.
And the specific surface area is 32m^Two/ G.

In Example 13 using EA as the organic solvent, the treating agent of Example 13-1 had a calcium utilization of 61% and a specific surface area of 31 m ² / g. The calcium utilization of the treating agent of Example 13-2 was 62%, the specific surface area was 30 m ² / g, and the pore volume was 0.175 cm ³ / g.
g, average pore diameter was 14.2 nm. Example 13-
The calcium utilization of the treating agent No. 3 was 62%, and the specific surface area was 30 m ² / g.

In Example 14 using IPA as the organic solvent, the treating agent of Example 14-1 had a calcium utilization of 52%, a specific surface area of 24 m ² / g, and a pore volume of 0.114 cm ^3. / G, average pore diameter was 12.6 nm. The calcium utilization of the treating agent of Example 14-2 was 62%, and the specific surface area was 35 m ² / g. Example 14
The calcium utilization ratio of the treating agent No.-3 was 66%, and the specific surface area was 34 m ² / g. The calcium utilization of the treating agent of Example 14-4 was 63%, and the specific surface area was 32 cm ² /
g, pore volume is 0.172 cm ³ / g, average pore diameter is 1
It was 4.0 nm.

Table 6 shows that, as a result of Example 15 in which one of the starting materials, silicon dioxide-containing material was zeolite, the silicon dioxide-containing material was zeolite, and a mixed solution of water and an organic solvent was used as a solvent. , This organic solvent is IPA
As a result of Example 16, the result of Example 17 in which the substance containing silicon dioxide was used as glass powder, and the substance containing silicon dioxide was used as glass powder, and a mixed solution of water and an organic solvent was further used as a solvent. Example 18 where IPA was used
The results are shown.

According to Table 6, the calcium utilization of the treating agent of Example 15 was 62%, the specific surface area was 24 m ² / g, the pore volume was 0.152 cm ³ / g, and the average pore diameter was 13.1 n.
m.

Example 1 using zeolite as the silicon dioxide-containing material and IPA as the organic solvent
In No. 6, the calcium utilization of the treating agent of Example 16-1 was 56%, and the specific surface area was 30 m ² / g. The calcium utilization of the treating agent of Example 16-2 was 59%, the specific surface area was 33 m ² / g, the pore volume was 0.163 cm ³ / g,
The average pore size was 14.2 nm. The calcium utilization of the treating agent of Example 16-3 was 62%, and the specific surface area was 32.
m ² / g.

In Example 17 using glass powder as the silicon dioxide-containing material, the treating agent of Example 17-1 had a calcium utilization of 37% and a specific surface area of 15 m ² /
g. The calcium utilization of the treating agent of Example 17-2 was 42%, and the specific surface area was 17 m ² / g. The calcium utilization of the treating agent of Example 17-3 was 48%, and the specific surface area was 26 m ² / g.

Example 18 using glass powder as the silicon dioxide-containing substance and IPA as the organic solvent
, The calcium utilization of the treating agent of Example 18-1 was 57%, and the specific surface area was 27 m ² / g. The calcium utilization of the treating agent of Example 18-2 was 46%, and the specific surface area was 20 m ² / g.

Table 7 shows that, as a result of Example 19 in which only water was used as the solvent and the amount of water was smaller than that in Example 1, a solution obtained by mixing a mixed solution of an organic solvent and water as a solvent with an aqueous solution of an additive was used. 2 shows the results of Example 20 using the same and the performance test results of the treating agents of Comparative Examples.

According to Table 7, the calcium utilization of the treating agent of Example 19-1 was 37%, the specific surface area was 27 m ² / g,
The pore volume is 0.115 cm ³ / g, and the average pore diameter is 9.2.
nm. The calcium utilization of the treating agent of Example 19-2 was 54%, the specific surface area was 30 m ² / g, the pore volume was 0.148 cm ³ / g, and the average pore diameter was 9.9 nm. The calcium utilization of the treating agent of Example 19-3 was 57
%, Specific surface area 31 m ² / g, pore volume 0.158 c
m ³ / g, and the average pore diameter was 11.0 nm.

The treating agent of Example 20-1 had a calcium utilization of 41%, a specific surface area of 32 m ² / g, a pore volume of 0.119 cm ³ / g, and an average pore diameter of 11.3 nm. . The calcium utilization of the treating agent of Example 20-2 was 45%, and the specific surface area was 33 m ² / g.

The same test was performed on the special lime slaked lime and the highly reactive slaked lime of the comparative example.
The calcium utilization rate of the special lime slaked lime was 20%, and the specific surface area was 10 m ² / g. The calcium reactivity of the highly reactive slaked lime of Comparative Example 2 was 25%, and the specific surface area was 37 m ² /
g, the pore volume was 0.119 cm ³ / g, and the average pore diameter was 5.8 nm (Table 7).

A comparison between Example 1 and Example 19 shows that the larger the amount of water as the solvent, the higher the pore volume and average pore diameter, and the higher the desulfurization performance. However, from the results of Example 19, the amount of water as the solvent was
It has been confirmed that even if the amount is less than 70 parts by weight with respect to 100 parts by weight of the mixture, the performance that can be used as a flue gas treatment agent can be achieved by reducing the particle size of quick lime used as a starting material. . Example 1
In No. 9, after the digestion reaction, the reaction product is in the form of a powder, so there is no need to perform a drying treatment. Therefore, there is an advantage over the first embodiment in terms of manufacturing time and cost.

Further, by adding citric acid, sucrose, glucose or sorbitol as an additive to a solvent in which quicklime is dispersed, the specific surface area, the pore volume and the average A treating agent having a large pore diameter can be obtained, and the desulfurization performance is high. The additive is not limited to citric acid and sugar used in the examples, and other saccharides having the same properties can be used.

Further, among the examples in which a mixed solution of water and an organic solvent was used as a solvent for dispersing quicklime, the results of Examples 6 to 8 in which glycols were used as the organic solvent were all comparative examples. The specific surface area can be made larger than in Example 2, and the desulfurization performance is high. Moreover, according to the results of Examples 9 to 11 using ethanolamines as the organic solvent, those having extremely large pore volumes were obtained. In addition, a product having a large specific surface area and high desulfurization performance can be obtained. Further, according to the results of Examples 12 to 14 using alcohols as the organic solvent, those having a large specific surface area, a large pore volume, a large average pore diameter, and a high desulfurization performance are obtained.

The organic solvent is not limited to the ethanolamines and alcohols used in the examples, but other amines and alcohols having the same properties can also be used.

The results of Example 20 show that, even when a mixed solution of an organic solvent and water and an aqueous solution of an additive are used as a solvent, the desulfurization performance is high, the specific surface area is large, A material having both a large volume and a large average pore diameter can be obtained. As the organic solvent, the organic solvents used in the other examples described above can be used. In addition, not limited to these organic solvents, other organic solvents having the same properties may be used. As for the additives, not only the additives used in the above-described other embodiments but also other additives having the same properties may be used. In Example 20, an example in which the content of triethanolamine in the solvent was 20 ml (Example 20-1) and an example in which the amount of TEA was 0.4 ml (Example 20-2) were given. However, if the content is within the range of 0.4 to 20 ml, the same properties as the properties of the treating agent of Example 20 shown in Table 7 can be obtained. It has been confirmed by such inventors. Similarly, with respect to the sorbitol aqueous solution, it has been confirmed that when used at a concentration in the range of 0.25 to 10% by weight, a treatment agent having properties similar to those of the treatment agent of Example 20 can be obtained.

Further, according to the results of Examples 15 and 16 produced using zeolite as a starting material, it can be seen that a treating agent having almost the same performance as that obtained by using coal ash can be obtained. When only water is used as the solvent, the performance as a treating agent increases as the amount of water increases.
Further, by containing alcohol (IPA) as a solvent, the specific surface area of the obtained treating agent increases,
It can be seen that the desulfurization performance is also improved.

Further, although the treating agents (Examples 17 and 18) produced by using glass powder as a starting material have a desulfurizing performance to the extent that they can be used as flue gas treating agents,
It was found that the treating agent produced using coal ash as a starting material had higher desulfurization performance. In addition, the desulfurization performance increases as the amount of the solvent water increases. In addition, it was found that the specific surface area of the obtained treating agent was increased and the desulfurization performance was improved by the alcohol contained in the solvent.

Comparing the results of Examples 1 to 20 with the results of Comparative Examples 1 and 2, it was found that the flue gas treating agents manufactured by using the method of the present invention were specially treated slaked lime and highly reactive slaked lime. Higher desulfurization performance can be obtained.

The treating agents of Examples 1 to 9 and 12 to 20 have a smaller specific surface area than the highly reactive slaked lime, and the desulfurizing performance is higher than that of the highly reactive slaked lime. Further, in Examples in which the pore volume and the average pore diameter were measured, the value of one or both of the pore volume and the average pore diameter was higher than the value of the highly reactive slaked lime. I have.
For this reason, it is suggested that the desulfurization performance is a value dependent on both or one of the pore volume and the pore diameter rather than the specific surface area.

Next, Embodiment 17-3 of the above embodiments will be described.
Of desalination and desulfurization performance of flue gas treatment agent
In this evaluation experiment, the desalination and desulfurization performance of the flue gas treating agent is examined using the bag filter test apparatus shown in FIG. 2 while reproducing the atmosphere of the municipal waste incineration plant (FIG. 2).

The bag filter test apparatus 30 has a length of 1350
mm, width 600 mm, and inner volume 0.486 m^Three
Housing 32 and a heat insulating material wound around the outer wall of the housing 32 (FIG.
(Not shown). 150 m diameter inside the housing 32
m, length 1050mm, surface area 0.945m^TwoNo ba
G-Filter CN5555 (trade name: manufactured by Teijin Limited) 3
4 are installed. Also, from the outside of the housing 32 to the inside
Sample introduction pipe 36 and water vapor introduction pipe 38
Have been. The sample introduction pipe 36 and the water vapor introduction pipe 3
Reference numeral 8 denotes an iron tube having an inner diameter of 35 mm. In addition, the sample introduction tube 36
Is provided with a sample inlet 40.
The distance from 40 to the bag filter 34 is 1000 mm
is there. The water vapor to be introduced into the housing 32 is
Humidifier 42 modified from a pan-type humidifier manufactured by Yahakko Electric Works
Generated using The sample introduction pipe 36 has
HCl gas, SO with treatment agent_TwoGas and NO gas
Is introduced. Then, the sample introduction pipe 36 and the water vapor introduction
Hot air heated by the burner 44 blows into the pipe 38.
It is set to be inserted. As a result, this sample
The introduction pipe 36 reproduces the flue of a garbage incineration plant. Also,
The casing 32 has an exhaust passage for gas that has passed through the bag filter 34.
46 is provided, and the gas discharged from the discharge path 46 is
It passes through a discharge pipe 48. The discharge pipe 48 has a discharge gas.
HCl gas concentration measurement device 50_TwoGas concentration
Each of the measuring devices 52 is provided. HCl gas concentration
In this example, the STACK PROBE CONT
ROLLERMODEL200SPC (Product name: Nippon Thermo Electron
Co., Ltd.) and HCl ANALYZER MODEL15 (trade name: Nihon Sa
-Mo Electron Co., Ltd.). Also, SO
_TwoIn this example, the gas concentration measuring device 52 is SO_TwoAutomatic
Analyzer MODEL711P (Product name: Nippon Thermo Electron Limited)
(Manufactured by Shikisha) (FIG. 2).

Next, in this performance test, the flue gas treating agent produced in Example 17-3 was used as a sample. Then, as the comparative samples, the special-purpose slaked lime of Comparative Example 1 and the highly reactive slaked lime of Comparative Example 2 are used.

The test conditions are shown in Table 8 below.

[0209]

[Table 8]

According to Table 8, it is assumed that the equivalent of the sample to be introduced from the sample introduction port 40 of the test apparatus is 3 equivalents. Here, one equivalent means that all of the samples are Ca (OH) ₂ and stoichiometrically reacts with all of the HCl gas and SO ₂ gas introduced into the sample introduction tube 36 to form CaCl ₂ . The amount of Ca (OH) ₂ to be CaSO ₄ is used. Therefore, 1
When an equivalent amount of the flue gas treating agent (sample) is introduced, the HCl gas concentration measuring device 50 and the SO ₂ gas concentration measuring device 52
If the concentrations of HCl gas and SO ₂ gas detected in step (1) are 0 (ppm), the desalting and desulfurization efficiency of the sample is 100%. When flue gas treatment is performed using slaked lime in a flue of a conventional general garbage incineration plant, if the concentration of HCl gas in the flue gas is about 1000 ppm, about 3 equivalents of slaked lime are removed. 90% by input
A degree of desalination effect is obtained.

Further, as other test conditions, the filtration speed was set to 0.8 m / min, the HCl gas concentration in the sample introduction tube 36 was set to 1000 ppm, and the SO ₂ gas concentration was set to 200 pp.
m, and the NO gas concentration is 100 ppm. The concentration of water introduced into the housing 32 as water vapor is 18% by volume. The temperature in the apparatus is maintained at a temperature between 160 and 170 ° C.

The test results are shown in FIG. 3 and FIG.

FIGS. 3 and 4 are characteristic diagrams of desalination efficiency and desulfurization efficiency, in which the vertical axis indicates efficiency (%) and the horizontal axis indicates time (minute). In each of the figures, the solid line indicates the characteristic curve of the flue gas treating agent manufactured in Example 13, the one-dot broken line indicates the characteristic curve of the special slaked lime of Comparative Example 1, and the dotted line indicates the characteristic curve of the highly reactive slaked lime of Comparative Example 2. Each is shown.

[0214] Three equivalents of the sample were introduced, and the filtration speed was 0.8 m.
/ Min, the desalting efficiency was 80 as shown in FIG.
After a lapse of minutes, the efficiency of the treating agent of Example 13 is higher than the efficiency of the special-purpose slaked lime and the highly reactive slaked lime. In addition, the desulfurization efficiency of the treating agent of Example 13 showed a value much higher than that of the special-purpose slaked lime and the highly reactive slaked lime before 30 minutes had elapsed (FIG. 4).

[0215] As a result, when the flue gas treating agent of Example 17-3 was charged with 3.0 equivalents of the sample and the filtration speed was set at 0.8 m / min, both the desalting efficiency and the desulfurization efficiency were comparative examples. It is found that it shows much better properties than the special name slaked lime and highly reactive slaked lime. In addition, comparing the calcium content per unit amount of the flue gas treatment agent of Example 17-3 with the calcium content per unit amount of the special-purpose slaked lime and the highly reactive slaked lime, it was found that the calcium content as a starting material of the treatment agent The calcium content in the treating agent of Example 17-3 is small by the amount of the silicon dioxide-containing material used. Therefore, Example 17
The desalting and desulfurization efficiency per unit weight of calcium contained in the treating agent of No.-3, that is, the calcium utilization rate, is higher than that of the special lime slaked lime and the highly reactive slaked lime, than inferred from the results shown in the figure. It is considered that the usage rate has been exceeded.

It is empirically known that the desalting efficiency increases with an increase in the specific surface area of the sample. Then, from the results of this evaluation experiment and the performance test described above,
It is inferred that the desulfurization efficiency is a performance that depends on the pore volume and / or the pore diameter.

The flue gas treating agent produced by the method of the present invention has a desalination effect equal to or higher than that of the highly reactive slaked lime, and has a desulfurization effect more than that of the specially-removed slaked lime and the highly reactive slaked lime. Is obtained. Therefore, the harmful gases HCl gas and SO ₂ gas in the flue gas discharged from the incineration plant for general garbage can be efficiently removed. Then, such a smoke exhausting agent can be manufactured by an easy method and at low cost.

In the above-described embodiment, the flue gas treating agent of the present invention was experimentally manufactured using a mortar mixer.
An apparatus conventionally used for producing slaked lime can be used.

[0219]

As is apparent from the above description, according to the method for producing a flue gas treating agent of the present invention, quicklime 50 to 9 is used.
For a 100 parts by weight of a mixture containing 9.9 parts by weight and 0.01 to 50 parts by weight of silicon dioxide, a stoichiometric amount of water for converting quicklime into slaked lime and a solvent 10 for dispersing the mixture are used. To 200 parts by weight. Thus, quicklime can be digested without fear of indigestion. In addition, amorphous calcium silicate can be generated by reacting quick lime and silicon dioxide using the heat of digestion generated during the digestion of quick lime, and the calcium silicate can be contained in the obtained slaked lime. Thereby, a flue gas treating agent having a high desalting and desulfurizing effect can be obtained. In addition, the above digestion reaction and the reaction for forming calcium silicate can be carried out simply by adding water necessary for digestion and a solvent for dispersion to a mixture of quicklime and silicon dioxide-containing material. Therefore, it is not necessary to heat the reaction system by applying heat from the outside as in the conventional case. Therefore, the cost and time required for manufacturing the flue gas treating agent can be reduced as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a test apparatus for explaining a performance test of a flue gas treating agent.

FIG. 2 is a schematic configuration diagram of a bag filter test apparatus used for examining the desalination and desulfurization performance of a flue gas treating agent.

FIG. 3 is a graph showing desalination efficiency characteristics in an evaluation experiment using a bag filter.

FIG. 4 is a graph showing desulfurization efficiency characteristics in an evaluation experiment using a bag filter.

[Explanation of symbols]

10: Test apparatus 12: Electric furnace 14: Reaction tube 16: Absorbent cotton 18: Gas concentration measuring apparatus 20a, 20b, 20c, 20d, 20e: Flow meter 22a: SO ₂ gas gas cylinder 22b: NO gas gas cylinder 22c: CO ₂ Gas cylinder for gas 22d: Gas cylinder for O ₂ gas 22e: Gas cylinder for N ₂ gas 24: Humidifier 26: Mixer 28: Gas supply pipe 30: Bag filter test apparatus 32: Housing 34: Bag filter 36: Sample introduction pipe 38 : Steam inlet pipe 40: Sample inlet 42: Humidifier 44: Burner 46: Discharge path 48: Discharge pipe 50: HCl gas concentration measuring device 52: SO ₂ gas concentration measuring device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) B01J 20/30 (72) Inventor Takeshi Murayama 2-1 Egan-shi, Egan, Hokkaido Within Hokkaido Electric Power Company Research Institute ( 72) Inventor Atsushi Sugimura 2-1 Egan-shi vs. Goose Hokkaido Research Institute of Electric Power Company, Hokkaido Electric Power Company (72) Inventor Tatsuo Murakami 3751 Akasakacho, Ogaki-shi, Gifu Pref. 3751 Akasaka-cho, Ogaki-shi, Gifu Prefecture F-term (reference) in Ueda Lime Manufacturing Co., Ltd.

Claims (16)

[Claims] 1. A mixture 1 containing quicklime and silicon dioxide.
Of the 00 parts by weight, 50 to 99.9 parts by weight of the quick lime and 0.01 to 50 parts by weight of the silicon dioxide, and a stoichiometry for converting the quick lime to slaked lime with respect to 100 parts by weight of the mixture A method for producing a flue gas treating agent, comprising the steps of: adding a suitable amount of water and 10 to 200 parts by weight of a solvent in which the mixture is dispersed. 2. The method for producing a flue gas treating agent according to claim 1, wherein the mixture contains 50 to 99.9 parts by weight of quicklime and a substance containing silicon dioxide containing 0.01 to 50 parts by weight of silicon dioxide. A method for producing a flue gas treating agent, characterized by being obtained by mixing 3. The method for producing a flue gas treating agent according to claim 2, wherein the silicon dioxide-containing substance is replaced with the silicon dioxide 1 to 20.
A method for producing a flue gas treating agent, which comprises mixing by weight. 4. The method for producing a flue gas treating agent according to claim 1, wherein the solvent is evaporated by heat of digestion of the quick lime and remains in the flue gas treating agent at the end of the reaction. A method for producing a flue gas treating agent, characterized by being added. 5. The method for producing a flue gas treating agent according to claim 1, wherein the solvent is a mixed solution of water and an organic solvent. Production method. 6. The method for producing a flue gas treating agent according to claim 5, wherein the organic solvent is one or more organic solvents selected from the group consisting of glycols, amines, and alcohols. A method for producing a flue gas treating agent. 7. The method for producing a flue gas treating agent according to claim 5, wherein the amount of the solvent is 10 parts by weight or more and 100 parts by weight or less. Manufacturing method. 8. The method for producing a flue gas treating agent according to claim 5, wherein the volume of the organic solvent is twice or less the volume of water in the solvent. A method for producing a flue gas treating agent, comprising: 9. The method for producing a flue gas treating agent according to claim 1, wherein the solvent is an additive aqueous solution in which an additive is dissolved in water. Manufacturing method. 10. The method for producing a flue gas treating agent according to claim 9, wherein the additive is one or more additives selected from an additive group consisting of citric acid and saccharides. A method for producing a flue gas treating agent. 11. The method for producing a flue gas treating agent according to claim 9, wherein the additive is added in an amount of 0.1 to 100 parts by weight of the mixture.
A method for producing a flue gas treating agent, which is dissolved so as to be 20 to 20 parts by weight. 12. The method for producing a flue gas treating agent according to any one of claims 9 to 11, wherein the amount of the solvent is 10 parts by weight or more and 100 parts by weight or less. Method of producing a flue gas treating agent. 13. The method for producing a flue gas treating agent according to claim 1, wherein the solvent is a solution in which an additive is dissolved in a mixed solution of water and an organic solvent. Manufacturing method of flue gas treatment agent. 14. The method for producing a flue gas treating agent according to claim 1, wherein the solvent is water. 15. The method according to claim 14, wherein the amount of the water is not less than 70 parts by weight and less than 200 parts by weight. 16. The method according to claim 14, wherein the amount of the water is at least 10 parts by weight and less than 70 parts by weight.