JP2000102720A - Desalted residue treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cement solidified matter from crumbling when the cement solidified matter after desalted residue treatment is stored outdoors. SOLUTION: A desalted residue generated when waste gas is subjected to desalting treatment with a cleaning device 73 is fed to an extrusion molding machine 87 by a desalted residue feeder 82 from a desalted residue hopper 81. And to the extrusion molding machine 87, cement and water are fed from a cement feeder 84 and a water feeder 85 respectively, and the desalted residue and cement are kneaded together with water. On this kneading, chlorine concentration in the desalted residue is detected by a chlorine concentration detector 95 and the adding quantity of the cement is adjusted according to the detection results. The cement is added so that chlorine concentration in cement formed matter of the desalted residue is 25 wt.% or less. And according to the chorine concentration in the desalted residue, control in which water is added by 20-50% from the water feeder 85 may be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a desalination residue generated when treating hydrogen chloride in exhaust gas discharged from an incinerator, and more particularly to a method for treating waste (e.g., waste from homes and offices). Of general waste such as municipal solid waste, waste plastics, car shredder dust, waste office equipment, electronic equipment, industrial waste such as chemical products, etc., including combustible materials). The present invention relates to a method for treating a desalination residue generated from the treatment.

[0002]

2. Description of the Related Art As an apparatus for treating incinerated materials, for example, general wastes such as municipal waste, industrial wastes such as waste plastics, etc., as one of the treatment apparatuses for wastes containing combustible materials, for example, Japanese Patent Publication No.
BACKGROUND ART A waste treatment plant disclosed in Japanese Patent No. 56253 is known. This waste treatment plant puts waste into a pyrolysis reactor, heats it in a low oxygen atmosphere, and generates pyrolysis gas and pyrolysis residue mainly composed of non-volatile components by pyrolysis. After cooling,
The mixture is guided to a separation device, and separated into fine-grained combustible components containing ash and coarse-grained non-combustible components such as rubble such as metal, pottery, gravel, and concrete pieces.
Further, the combustible component is pulverized, and the pulverized combustible component and the above-mentioned pyrolysis gas are burned and melted in a combustion melting furnace, and the ash contained in the combustible component is converted into a molten slag, and the molten slag is formed. The slag is discharged, cooled and solidified, and the exhaust gas of the combustion melting furnace is supplied to a waste heat steam generator to collect waste heat.

[0003] Exhaust gas generated in a combustion melting furnace contains fly ash and hydrogen chloride. In the above waste treatment plant, a dust collector (first bag filter) and a gas purification device (second bag filter) are arranged in series at the downstream side of the combustion melting furnace, and the exhaust gas from the combustion melting furnace is disposed. The fly ash is removed by a dust collector, and a desalinating agent is added by a gas purifier to remove hydrogen chloride. Examples of the desalting agent include calcium hydroxide (Ca (OH) ₂ ). When this calcium hydroxide is added, hydrogen chloride (HCl) in the exhaust gas
And dihydrate calcium chloride (CaCl ₂ .2H ₂ O) is produced as a desalting residue.

[0004]

Since the above-mentioned desalting residue is a powder, it is generally stored outdoors as a cement molded product after addition of cement or the like. But,
Dihydrated calcium chloride is hygroscopic, and particularly when the chlorine concentration in the cement molded product is high, when it is stored outdoors, heat is generated by absorbing moisture in the air, and cracks are easily generated on the surface of the cement molded product. When such cracks occur, there is a drawback that components in the cement molded product are eluted by rainwater or the like, and the cement molded product is eventually ragged.

[0005] An object of the present invention is to provide a method for treating a desalinated residue that can prevent the cement molded product from becoming tattered even when the cement molded product obtained by treating the desalted residue is stored outdoors. Is to provide.

[0006]

In order to achieve the above-mentioned object, the present invention provides a method for introducing a calcium-based desalinating agent into flue gas discharged from an incinerator for incineration of waste and the like, and removing the dust. In the method for treating a desalination residue for removing hydrogen chloride as a desalination residue, cement and water are added to the desalination residue, and a cement molded product is molded using an extruder. And especially in this invention, while adjusting the addition amount according to the chlorine concentration in the said desalination residue, it adds the cement to the said desalination residue, and is characterized by shaping | molding the cement molding of the desalination residue.

[0007] As described above, if the amount of cement added is adjusted according to the chlorine concentration in the desalination residue, the amount of dihydrated calcium chloride contained in the cement molded product can be suppressed, and the cement molded product can be used. It won't be tattered when stored outdoors.

[0008] Specifically, the amount of desalted residue to be treated is
Chlorine concentration in the cement molding of desalination residue is 25% by weight
Cement is added to the desalination residue so that: Water is added in an amount of 20 to 50% depending on the chlorine concentration in the desalting residue.

When adding water, it is preferable to adjust the amount of water so that the temperature during molding of the cement molded product is 80 to 100 ° C. When water is added to dihydrated calcium chloride in a cement molded product, heat is generated, and when the temperature of the cement molded product exceeds 100 ° C. due to this heat generation, the water in the cement molded product becomes water vapor. Normal molding becomes difficult, but by adjusting the amount of water added, the temperature at the time of molding the cement molded product is 80 to 1
Since the temperature is controlled at 00 ° C., it is possible to normally mold a cement molded product.

[0010] The present invention also provides a desalination residue in which a calcium-based desalinating agent is introduced into exhaust gas discharged from an incinerator for incinerating waste and the like, and hydrogen chloride in the exhaust gas is treated as a desalination residue. In the treatment method, cement and water are added to the desalination residue according to the chlorine concentration in the desalination residue, and a cement molding of the desalination residue is formed by an extruder, and the amount of water added is adjusted. By doing so, the extrusion pressure of the extruder is maintained at a predetermined pressure.

When the cement molded product is molded by an extruder, if the amount of water is too small, the desalting residue to which cement is added becomes too viscous to extrude. Although the viscosity of the salt residue decreases, normal extrusion cannot be performed. According to the above configuration, the amount of water added can be optimally adjusted, so that the desalted residue to which cement has been added has an appropriate viscosity, and extrusion can be performed normally.

The chlorine concentration in the desalination residue can be calculated from the hydrogen chloride concentration in the exhaust gas before and after the introduction of the desalting agent, the supply amount of the desalting agent, and the flow rate of the exhaust gas.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a system diagram showing one embodiment of the waste treatment plant. Waste treatment plant 48
In the example, the crushing machine 52 is disposed in the receiving yard 50, for example, a crusher of a biaxial shearing type, and the waste a such as municipal waste is supplied to the crushing machine 52 by the first conveyor 51, where, for example, Crushed to 150 mm square or less. The crushed waste a is charged by the second conveyor 53 and passed through a screw feeder 54 to a pyrolysis reactor 55.
Supplied to The thermal decomposition reactor 55 is, for example, a horizontal rotary drum, and the inside thereof is kept in a low oxygen atmosphere by a sealing mechanism (not shown), and the high-temperature air disposed on the downstream side of the combustion melting furnace 63 as a combustor is used. Heater 6
Heated air which is heated by 8 is supplied from the line L _1.

By this heated air, the waste a supplied into the pyrolysis reactor 55 is kept at 300 to 600 ° C., usually 4 ° C.
It is heated to about 50 ° C. Thereby, this waste a
Is thermally decomposed, the thermal decomposition gas G _1, primarily to produce a pyrolysis residue b nonvolatile. Then, the pyrolysis gas G ₁ is generated in the pyrolytic reactor 55 and the pyrolysis residue b
And the pyrolysis gas G ₁
Combustion melting furnace 63 via line L ₂ is a pyrolysis gas pipe
Is supplied to the burner 62.

The pyrolysis residue b varies depending on the type of the waste a. In the case of municipal solid waste in Japan, according to the knowledge of the present inventors, most of the flammable components 10 to 10 are relatively fine particles.
60%, relatively fine ash content 5-40%, coarse metal component 7
~ 50%, coarse rubble, pottery, concrete, etc.
%.

Pyrolysis residue b having such components
Is discharged at a relatively high temperature of about 450 ° C., and is cooled to about 80 ° C. by the cooling device 57 and guided to the separating device 58, where it is separated into the combustible component c and the non-combustible component d. As the separator 58, a known separator such as a magnetic separator, a centrifugal separator, or a wind separator is used. The combustible component c from which the non-combustible component d has been separated and removed as described above is supplied to the pulverizer 60. The crusher 60 is suitably of a roll type, a tube mill type, a rod mill type, a ball mill type or the like, and is appropriately selected depending on the properties of the waste to be treated. Non-combustible component d
Are stored in the container 59.

[0017] Then, the combustion component c in this grinder 60 is preferably ground to all 1mm or less, the ground combustible component c is supplied to the burner 62 of the burning melting furnace 63 via line L ₃ You. On the other hand, the combustion air and the pyrolysis gas G ₁ supplied from the line L ₄ by the blower 61 and the combustible component c are heated at 1300 ° C. in the combustion melting furnace 63.
Combustion in a high temperature range of about
The combustion ash generated from the relatively fine ash of the above melts to form molten slag f.

Next, non-combustible waste e is supplied as much as possible towards the bottom of the combustion melting furnace 63 through a line L _5.
At this time, the non-combustible waste e is preferably made into fine particles of 1 mm or less in order to improve the efficiency of combustion and melting, and is preferably heated. Therefore, crusher provided in line L _5, crush provided a pulverizer 64 and heater 65, is good is supplied to the combustion melting furnace 63 is a processing such as grinding and heating. Therefore, some of the heated air in the hot air heater 68 disposed on the downstream side of the combustion melting furnace 63, and is supplied to the heater 65 via a line L _8.

The non-combustible waste e supplied to the combustion and melting furnace 63 is melted in the combustion and melting furnace 63 to become slag g and mixed with the molten slag f by the combustion ash. Drops inside and becomes granulated slag. The granulated slag is blocked or granulated in a predetermined shape by a device (not shown) and can be reused as a building material or a pavement material. In this case, the non-combustible waste e may be mixed into the molten slag f without melting if necessary.

The combustion exhaust gas G ₂ generated in the combustion melting furnace 63 of such a waste treatment plant is supplied to a high-temperature air heater 6.
8 is heat recovered by further waste heat boiler 69 from the line L ₆
After the heat is recovered, the fly ash 72 is removed by the dust collector (first bag filter) 71, and then desalted by the gas purifier (second bag filter) 73, and the desalted residue 74 is removed.
After draining, cold clean gas G _3, and the is discharged from the chimney 76 into the atmosphere through the induced draft machine 75. In the gas purifier 73, desulfurization can be performed simultaneously with desalination.

A part of the exhaust gas G ₃ is supplied by a blower 77 to a cooling device 57 via a line L ₇ . Fly ash 72 collecting in the dust collector 71 is returned by the line L ₉ to the combustion melting furnace 63, it is mixed melted and into the slag. The steam generated by the waste heat boiler 69 is supplied to the generator 7
0 is sent to the steam turbine to work, also, part of it is sent to the heater 65 by a line L _8.

Further, as shown in FIG.
Of calcium hydroxide (Ca (O (O)
H) ₂ ) 78 is input. When calcium hydroxide is introduced, hydrogen chloride (HCl) in the exhaust gas reacts with calcium hydroxide, and is desalted to form dihydrated calcium chloride (C).
aCl ₂ .2H ₂ O). This desalting residue also contains unreacted calcium hydroxide.

Next, the waste treatment plant 48 of the present embodiment is provided with a desalination residue treatment device 80 for treating desalination residues generated in the gas purification device 73. As shown in FIG. 3, the desalination residue treatment device 80 includes a desalination residue feeder 82 connected to a desalination residue hopper 81, a cement feeder 84 connected to a cement hopper 83, and a water tank 85A. A pump 85B and a kneading type extruder 87 are provided. The extruder 87 is supplied with desalinated residue from a desalted residue supplier 82, cement from a cement supplier 84, and water from a pump 85B.

As shown in FIG. 4, the extruder 87 has a feed screw 89 and a push screw 90 arranged in parallel in a casing 88 (in FIG. 4, the feed screw 89 and the feed screw 89 on the near side are arranged in parallel). Extrusion screw 9
0 only). A kneading paddle 91 is provided between the feeding screw 89 and the extruding screw 90, and the desalting residue and cement are kneaded with the water by the kneading paddle 91. That is, the desalinated residue and the cement put into the casing 88 from the input port 92 are conveyed to the kneading paddle 91 by the feed screw 89, kneaded with the water by the kneading paddle 91, and then extruded.
As a result, it is extruded from the extrusion port 93 as a rod-shaped cement molded product.

FIG. 5 is a sectional view taken along the line AA of FIG.
FIG. 3 is a view schematically showing a kneading mechanism of a kneading paddle 91.
As shown in the figure, the kneading paddle has a wing-shaped paddle body 91.
A, 91B, 90 degrees out of phase, feed screw 89
And the extruding screw 90, and the paddle bodies 91A and 91B rotate in the direction of the arrow, so that the desalinated residue and cement are removed in the space defined by the casing 88 and the paddle bodies 91A and 91B as shown in FIG. a) →
It is kneaded through the steps shown in (b) → (c).

In this embodiment, the extruder 8
When kneading the desalination residue and cement in 7,
The amount of cement added is adjusted according to the chlorine concentration in the desalination residue. That is, as shown in FIG.
A chlorine concentration detector 95 is provided to detect the chlorine concentration of the desalinated residue discharged from the apparatus, and the cement feeder 84 is controlled according to the detection result, and the amount of cement added to the extruder 87 is controlled. Adjusted.

Here, molded cement products having different chlorine concentrations were formed and stored outdoors for three months, and an experiment was conducted on how the shape and weight of the solidified cement material changed. When stored outdoors for three months, the cement molded product evaporates and solidifies into a cement solidified product. Table 1 shows the experimental results.

[0028]

[Table 1]

As can be seen from Table 1, the chlorine concentration is 10%,
At 15% and 20%, there was no change in the shape and weight of the cement molded product (that is, cement solidified product) at the final disposal site, but when the chlorine concentration was 25%, cracks occurred and the weight was reduced. He had lost 10%. Chlorine concentration 30%,
At 35% it collapsed and its weight was reduced by 90%. Therefore, if a cement solid having a chlorine concentration of more than 25% is stored outdoors for a long period of time, the solidified cement may be tattered, and the chlorine concentration in the cement molded product may be reduced to 25%.
It is necessary to keep it below.

From the experimental results, it is known that the relationship between the chlorine concentration in the desalting residue and the amount of cement added is as shown in FIG. Here, the amount of cement addition is defined by the following equation. Cement addition amount (%) = (Cement addition amount (Kg / h) / desalting residue treatment amount (Kg / h)) × 100 In FIG. 6, between the upper limit value of the cement addition amount and the lower limit value of the cement addition amount is appropriate. The amount of added cement is high. As described above, if the chlorine concentration in the cement molded product containing the desalting residue is suppressed to 25% or less, the solidified cement can be prevented from being tattered. Therefore, in the present embodiment, when the chlorine concentration in the cement molded product containing the desalting residue (described as the desalting residue in FIG. 6) is 25 (%), the upper limit value of the cement addition amount is 25 (%). Therefore, the addition amount of cement is set to 25% or less.

As described above, the water in the water tank 85A is supplied to the extruder 87 by the pump 85B. In FIG. 1, the water tank 85A and the pump 85B are collectively shown as a water supply device 85. As shown in FIG.
The heavy metal fixing agent 96 is supplied to the water supply device 85. Since a small amount of heavy metals may be contained in the exhaust gas from the dust collector 71, it is possible to completely remove the heavy metals from the cement molding by adding the heavy metal fixing agent 96. It is planned.

Further, as shown in FIG.
The water feeder 85 is controlled according to the detection result at 5, and the amount of water added to the extruder 87 is adjusted based on the chlorine concentration in the desalination residue.

It is known from the experimental results that the relationship between the chlorine concentration in the desalting residue and the amount of added water is as shown in FIG. Here, the water addition amount is defined by the following equation. Water addition amount (%) = (Water addition amount (Kg / h) / desalting residue treatment amount
(Kg / h)) × 100 In FIG. 7, between the upper limit value of the water addition amount and the lower limit value of the water addition amount is an appropriate water addition amount. As described above, if the chlorine concentration of the solidified cement containing the desalination residue is 25% or less,
The solidified cement can be prevented from being tattered. Therefore, in the present embodiment, when the chlorine concentration in the cement molded product containing the desalting residue (denoted as the desalting residue in FIG. 7) is 25 (%), the upper limit of the water addition amount is approximately 50 (%). Yes, when the chlorine concentration is 0 (%), the water addition amount lower limit is 20 (%) or less if the water addition amount lower limit graph is extended to the left, so that the water addition amount is 20 to 50%. Is set to

Next, as shown in FIG.
A thermometer 97 is provided to detect the temperature of the cement molded product extruded from. A temperature indicating controller 98 is connected to the thermometer 97.
Controls the water supply device 85 based on the detection result of the thermometer 97, and adjusts the amount of water added from the water supply device 85 to the extruder 87.

Calcium chloride (CaC) in the desalted residue
l ₂ ) is hygroscopic and causes an exothermic reaction when water is added into the extruder 87, so that the temperature of the cement molded product in the extruder 87 increases. Here, the relationship between the amount of water added and the temperature of the cement molding is shown in FIG. In FIG. 8, up to the point P, the temperature of the cement molded product increases as the amount of added water increases. However, when the temperature exceeds the point P, the temperature of the cement molded product decreases. This is because, when the amount of added water increases, the heated cement molded product is cooled by water. In the present embodiment, the amount of added water is adjusted so that the temperature of the cement molded product becomes 80 to 100 ° C. Desirably, the amount of water added is adjusted so that the temperature of the cement molded product is 85 to 95 ° C. Instead of directly detecting the temperature of the cement molded product, the amount of water may be adjusted by indirectly detecting the die temperature of the extruder 87. In this case, the amount of water added is adjusted so that the die temperature of the extruder becomes 50 to 70 ° C. Desirably, the amount of water added is adjusted so that the die temperature of the extruder becomes 55 to 65 ° C.

When the temperature of the cement molded product exceeds 100 ° C., water in the cement molded product becomes steam and flows backward in the extruder 87 toward the inlet 92 or blows out to the extrusion outlet 93. When flowing back to the inlet 92 side, dew condensation occurs around the inlet 92, and when blowing out to the extrusion port 93 side, the cement adheres to the extrusion port 93 to cause molding failure of the cement molded product. In particular, when the temperature of the cement molded product is low, the amount of added water is large (that is, FIG.
And the cement molded product is in a sticky state and cannot be extruded. In the present embodiment, the amount of added water is adjusted so that the temperature of the cement molded product falls within an appropriate range, so that the cement molded product can be molded normally.

FIG. 9 shows another embodiment of the present invention. The feature of this embodiment is that a pressure detector 99 for detecting the pressure in the casing of the extruder 87 is provided, and based on the detection result, the water feeder 85 sends the extruder 87
That is, the amount of water added to the water is adjusted.

When extruding a cement molded product with an extruder 87, if the amount of water added is too small, the viscosity of the cement molded product becomes large and it becomes difficult to extrude. If it is too large, the viscosity of the cement molded product becomes small. If it is too small, normal extrusion cannot be performed. In the present embodiment, the pressure in the casing of the extruder 87 is constantly monitored by the pressure detector 99. When the pressure increases (when the viscosity of the cement molding increases), the amount of water added is reduced. When the pressure increases (when the viscosity of the cement molded product decreases), control is performed to reduce the amount of water added. Thus, the cement molded product in the extruder 87 always has an appropriate viscosity, and the extrusion can be performed normally.

Next, a mechanism for detecting the chlorine concentration will be described. As shown in FIG.
Desalinating agent supply apparatus 100
Is provided. Calcium hydroxide (Ca (OH) ₂ ) is supplied from the desalting agent supply device 100 as a desalting agent. Further, a hydrogen chloride meter 101 for detecting the concentration of hydrogen chloride in the exhaust gas before the introduction of the desalinating agent and a hydrogen chloride meter 102 for detecting the concentration of hydrogen chloride in the exhaust gas after passing through the gas purifying device 73 after the introduction of the desalinating agent are provided. Is provided. Further, an exhaust gas flow meter 103 for detecting the flow rate of the exhaust gas is provided. Detection signals from the hydrogen chloride meters 101 and 102 and the exhaust gas flow meter 103 are input to a chlorine concentration calculator 104, and the chlorine concentration calculator 104 calculates the chlorine concentration in the desalination residue based on the input signals.

Finally, a calculation example of calculating the chlorine concentration in the desalination residue will be described. First, the concentration of hydrogen chloride at the inlet and outlet of the gas purifier 73, the flow rate of the exhaust gas, and the desalinating agent (Ca
It is assumed that the supply amount of (OH) ₂ ) is as follows. Hydrogen chloride concentration D1 at the inlet side of the gas purification device: 500 ppm
-Hydrogen chloride concentration D2 at dry gas purifier outlet side: 25 ppm-
Dry Exhaust gas flow rate R: 1000 Nm ₃ / h-Dry Desalting agent supply amount Q: 20 kg / h The reaction formula when the desalinating agent is introduced into the exhaust gas is as follows: Ca (OH) ₂ + 2HCl → CaCl ₂ .2H ₂ O Here, the molecular weight of Ca (OH) ₂ is 74, and CaCl ₂ .2H
The molecular weight of ₂ O is 147.

The amount of slaked lime that reacts is

[0042]

(Equation 1)

Therefore, the unreacted desalting agent is Q-7.
8 = 12.2.

The amount of the reaction product is

[0045]

(Equation 2)

The molecular weight of Cl _{2 in} CaCl ₂ .2H ₂ O is
Since 35.5 × 2 = 71, the Cl amount is

[0047]

(Equation 3)

Therefore, the Cl concentration is

[0049]

(Equation 4)

[0050]

As described above, according to the method for treating a desalted residue of the present invention, the amount of cement added is adjusted according to the chlorine concentration in the desalted residue. The amount of dihydrated calcium chloride can be suppressed, and even when the cement solid is stored outdoors, the cement solid does not become tattered.

Further, since the cement molded product is molded while adjusting the amount of water added, it is possible to suppress the temperature during molding from becoming too high, and it is possible to normally mold the cement molded product. Becomes Furthermore, by adjusting the amount of water added and molding the cement molding,
The viscosity of the cement molding can be adjusted to an optimum state for extrusion molding.

[Brief description of the drawings]

FIG. 1 is a system diagram schematically showing a desalination residue treatment device.

FIG. 2 is a system diagram of a waste treatment plant.

FIG. 3 is a schematic configuration diagram of a desalination residue treatment device.

FIG. 4 is a configuration diagram of an extrusion molding machine.

FIG. 5 is a diagram illustrating a kneading mechanism of an extruder.

FIG. 6 is a graph showing a relationship between a chlorine concentration in a desalination residue and an amount of cement added.

FIG. 7 is a diagram showing the relationship between the chlorine concentration in the desalination residue and the amount of water added.

FIG. 8 is a diagram showing the relationship between the amount of water added and the temperature of a cement molded product.

FIG. 9 is a system diagram showing an outline of a desalination residue treatment device according to another example.

FIG. 10 is a diagram showing an example for detecting a chlorine concentration in a desalination residue.

[Explanation of symbols]

 71 dust collecting device 73 gas purifying device 78 calcium-based desalting agent 80 desalinating residue treatment device 81 desalinating residue hopper 82 desalinating residue feeder 83 cement hopper 84 cement feeder 85 water feeder 85A water tank 85B pump 87 extrusion Molding machine 95 chlorine concentration detector 96 heavy metal fixing agent 97 thermometer 98 temperature indicating controller 99 pressure detector 100 desalinating agent supply device 101,102 hydrogen chloride meter 103 exhaust gas flow meter 104 chlorine concentration calculator

Continued on the front page (72) Inventor Hiroaki Harada 5-6-4 Tsukiji, Chuo-ku, Tokyo Mitsui Engineering & Shipbuilding Co., Ltd. F-term (reference) 3K065 BA05 BA07 HA03 3K070 DA05 DA16 DA83 4D002 AA19 BA03 BA14 BA20 CA13 CA20 DA05 DA12 DA35 DA70 EA02 EA07 FA01 FA10 GA01 GA02 GA03 GB01 GB02 GB06 GB11 GB20

Claims (7)

[Claims] 1. A method for treating a desalinated residue in which a calcium-based desalinating agent is introduced into exhaust gas discharged from an incinerator for incinerating waste and the like and dust is removed, and hydrogen chloride in the exhaust gas is removed as a desalinated residue. The method for treating a desalted residue according to any one of claims 1 to 3, wherein cement and water are added to the desalted residue, and a cement molded product is formed using an extruder. 2. A method for treating a desalinated residue in which a calcium-based desalinating agent is introduced into exhaust gas discharged from an incinerator for incinerating waste and the like and dust is removed, and hydrogen chloride in the exhaust gas is removed as a desalinated residue. In the treatment of the desalination residue, wherein cement is added to the desalination residue to form a cement molded product of the desalination residue while adjusting the amount of addition according to the chlorine concentration in the desalination residue. Method. 3. A method for treating a desalinated residue, wherein a calcium-based desalinating agent is introduced into an exhaust gas discharged from an incinerator for incinerating wastes and the like, and hydrogen chloride in the exhaust gas is treated as a desalinated residue. Adding cement to the desalination residue so that the chlorine concentration in the cement molding of the desalination residue is 25% or less by weight with respect to the treatment amount of the desalination residue, and adding the chlorine concentration in the desalination residue 20. A method for treating a desalinated residue, comprising adding 20 to 50% of water depending on the conditions to form a cement molded product of the desalted residue. 4. The method for treating a desalted residue according to claim 3, wherein the amount of the cement added is adjusted based on a chlorine concentration in the desalted residue. 5. The method for treating a desalination residue according to claim 3, wherein the amount of the water added is adjusted so that the molding temperature of the cement molded product is 80 to 100 ° C. How to treat salt residue. 6. A method for treating a desalinated residue, wherein a calcium-based desalinating agent is introduced into an exhaust gas discharged from an incinerator for incinerating wastes and the like, and hydrogen chloride in the exhaust gas is treated as a desalinated residue. By adding cement and water to the desalination residue according to the chlorine concentration in the desalination residue, and forming a cement molded product of the desalination residue by an extruder, by adjusting the amount of water added, A method for treating a desalted residue, wherein the extrusion pressure of the extruder is maintained at a predetermined pressure. 7. The method for treating a desalination residue according to claim 2, wherein the chlorine concentration in the desalination residue is determined by changing the concentration of chlorine in the exhaust gas before and after the introduction of the desalting agent. A method for treating a desalination residue, wherein the method is calculated from a hydrogen concentration, a supply amount of the desalting agent, and a flow rate of the exhaust gas.