KR101975668B1 - Potassium Chloride Obtaining System of Cement Process Bypass Dust - Google Patents

Abstract

More particularly, the present invention relates to a system for obtaining chlorides from a burned fly ash and a cement process. More particularly, the present invention relates to a system for collecting chlorides from a fly ash or a cement process produced by incineration of household garbage and separating them into residual sludge and primary filtrate, The filtrate is an incineration fly ash or a cement process to obtain a chloride through a heavy metal removal process and an evaporation / drying process so as to enable recycling of the effective mineral in the designated waste to be discarded.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for producing chlorides in Busan dust,

More particularly, the present invention relates to a system for obtaining chlorides in a flue gas produced by incineration fly ash or cement process, and more particularly, to a process for producing flue gas from a fly ash produced during incineration of household garbage or cement process by mixing water with residual sludge and primary filtrate, The filtrate is an incineration fly ash or a cement process to obtain a chloride through a heavy metal removal process and an evaporation / drying process so as to enable recycling of the effective mineral in the designated waste to be discarded.

In the case of incineration of household waste generated by local governments, it is divided into fly ash and flooring. Currently, only some flooring materials are recycled, and fly ash is completely disposed of as designated waste, and recycling measures are urgently needed It is true. The presence of recyclable chlorides (sodium chloride and chloride) in the fly ash allows the fly ash to be dissolved in water to separate the water-soluble chlorides from the fly ash after drying and thus the large amount of waste treatment costs and landfill capacity Can be saved.

Cement Process In the case of Busan Dust, since the IMF, domestic cement companies are recycling various industrial byproducts / municipal wastes as auxiliary waste fuels in terms of cost reduction and resource recycling. They contain heavy metals and chlorine, and especially municipal waste and Refuse Derived Fuel (RDF) contain a large amount of chlorine.

The amount of waste used in domestic cement plants has increased rapidly in recent years, and the amount of bypass dust (process Busan dust) in cement factories is also increasing.

Here, Bypass dust is a fine powder discharged through a chlorine bypass system installed in a cement kiln preheating section, and its main components are composed of alkali and chlorine.

Domestic cement manufacturing process Although the amount of produced Busut dust has not been calculated accurately, it is estimated that a total of 40,000 tons / year will be generated from inland dust waste. Dust is disposed of as waste (treatment cost = 200,000 ~ 230,000 won / ton) or is recycled in the factory.

The recycling method is simply a method of re-introducing into the cement grinder, and alkali and chlorine components are not removed. In recent years, there has been a lot of need and interest in removing heavy metals. For example, Pb, the representative heavy metal of Dust, is about 0.05 ~ 1.0% in Korea and Japan is very high at about 6% This is because of the increased need.

The main components of domestic dust are composed of CaO, K2O and Cl-, but CaO component is calcite or limestone crystal, and K2O and Cl- exist as chloride crystals. The chloride is well dissolved in water, and after drying after dissolution, it is possible to re-acquire the chloride crystals, and the waste amount of Busan dust in the cement manufacturing process can be minimized.

In particular, chlorides are not produced domestically and depend entirely on imports. Therefore, if chlorides, which are widely used in various fields such as fertilizers, food additives, basic raw materials and road snow removing agents, can be reused from dust, And the effect of substitution of imports of chloride will be induced, and the ripple effect will be greatly increased.

Therefore, it is urgent to develop a process system capable of obtaining a chloride free from heavy metals in Busan dust generated in such a cement manufacturing process.

DISCLOSURE OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to solve the above-mentioned problems by mixing water of burning fly ash and Pusan dust with residual sludge and primary filtrate and separating primary filtrate by evaporation process through heavy metal removal process and evaporation device An object of the present invention is to provide a system for producing chlorides in Busan dust, which is an incineration fly ash or a cement process, which is capable of recycling incineration fly ash which is completely discarded by obtaining chlorides and effective minerals in Busan dust, .

The present invention has the following features in order to achieve the above object.

The present invention relates to a transfer device for transferring burnt fly ash generated during incineration of waste or by-produced dust generated on a cement process; A silo in which an incineration fly ash or a by-product dust is stored through the transfer device and an amount of which is controlled by a valve means; A sludge which receives the incineration fly ash or the by-product dust from the silo and receives water from the water storage tank and generates sludge mixed with the incinerated fly ash or the by-product dust and water; A first centrifugal separator for receiving sludge from the slicker and separating the sludge into primary filtrate and primary sludge using centrifugal force; The primary filtrate is supplied from the centrifugal separator and stored. When the additive for heavy metal removal is supplied and mixed with the stored primary filtrate, the heavy metal contained in the primary filtrate reacts with the additive to solidify the secondary filtrate, And a post tank in which a precipitate is generated; A ceramic filter for receiving a secondary filtrate and a precipitate from the post tank and separating the same from the post tank; An evaporator in which a water content in the filtrate is evaporated to 60 to 80% as heat is applied to the filtrate by supplying the secondary filtrate from the ceramic filter to produce chloride and residual solution in the crystalline state of sodium chloride or potassium chloride; A second centrifugal separator for separating a chloride and a residual solution in a crystalline state by supplying chloride and a residual solution in a crystalline state from the evaporator; And a dryer for supplying chlorides to the chloride product silo by generating chlorides from which the heavy metals have been removed by supplying the chlorides in the crystalline state from the second centrifugal separator and drying the chlorides.

The evaporator includes a first evaporator into which a secondary filtrate flows, a second evaporator into which a secondary filtrate is firstly evaporated from the first evaporator, and a second evaporator in which steam is supplied from the outside to heat the steam, A second heat exchanger for heating the gas evaporated in the second evaporator and then supplying the gas to the first evaporator, and a condenser for introducing and evaporating the vaporized gas in the first evaporator, , The first evaporator transfers the unfiltered secondary filtrate to the second evaporator so that the evaporation process is carried out over the second evaporator and the secondary filtrate consisting of the chloride in the crystalline state that has not evaporated in the second evaporator and the residual liquid Is supplied to the second centrifugal separator.

In addition, the second centrifugal separator separates the chloride in the crystallized state and the remaining liquid, and then transfers the remaining liquid to the first evaporator or the post tank, so that the chloride remaining in the remaining liquid is re-acquired.

According to the present invention, the recycling of the recyclable waste incineration ash and the recycleable chlorine in the cement process by-product dirt can prevent recycling of resources and environmental pollution due to waste landfill.

In addition, since the evaporator is composed of the first evaporator and the second evaporator, and the heat source used in the second evaporator is reused in the first evaporator, the evaporation recovery is increased and the heat source necessary for the evaporator is minimized.

In addition, the residual liquid generated through the second centrifugal separator is supplied to the first evaporator or the post tank to maximize the yield of potassium chloride remaining in the remaining liquid.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic process diagram of a chloride yield system in accordance with one embodiment of the present invention.
2 is a schematic configuration diagram of an evaporation apparatus according to an embodiment of the present invention.
3 is a schematic diagram illustrating a process of a second centrifugal separator according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

First, the terminology used in the present application is used only to describe a specific embodiment, and is not intended to limit the present invention, and the singular expressions may include plural expressions unless the context clearly indicates otherwise. Also, in this application, the terms "comprise", "having", and the like are intended to specify that there are stated features, integers, steps, operations, elements, parts or combinations thereof, But do not preclude the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a schematic structural view of a chloride obtaining system according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a vaporizing apparatus according to an embodiment of the present invention, FIG. FIG. 2 is a schematic diagram showing a process of a second centrifugal separator according to the present invention.

Referring to the drawings, a chloride system 100 according to an embodiment of the present invention includes a transfer device 10 for transferring burned fly ash generated in incineration fly ash or cement produced during incineration of waste, A silo 20 in which an incineration fly ash or a by-product dust is stored and the amount of which is controlled by a valve means 21, and a supply of water is received from the water storage tank WT by receiving the incineration fly ash or by-product dust from the silo 20 A sludge (30) which receives sludge from the slurry (30) and separates the sludge into a primary filtrate and a primary sludge by centrifugal force The centrifugal separator 40 and the centrifugal separator 40 to receive and store the primary filtrate and mix additives with the primary filtrate to remove the heavy metal, A post tank 50 in which a heavy metal contained in the filtrate reacts with the additive to solidify to form a secondary filtrate and a precipitate, and a secondary filtrate and a precipitate from the post tank 50, A filter 60 and a secondary filtrate are supplied from the ceramic filter 60 and heat is applied to the filtrate to evaporate the water content in the filtrate to 60% to 80%, whereby the chloride containing sodium chloride or potassium chloride in a crystalline state and the residual chloride A second centrifugal separator 80 for separating the chloride and the residual liquid in the crystalline state from the chlorides and the residual liquid in the crystalline state from the evaporator 70, And a drier (90) for supplying chloride from the centrifugal separator (80) to the chloride product silo (S) by generating chlorides from which the heavy metals have been removed by supplying and drying the chlorides in the crystalline state.

As shown in FIG. 1, the transfer device 10 may be constructed in various ways depending on the process environment. For example, as shown in FIG. 1, the transfer device 10 may transfer burnt fly ash generated during incineration of waste stored in a ton- A hopper 2 for temporarily storing an incineration fly ash or a by-product dust in the tonneau transferred through the hoist 1, and an ash-generating fly ash or a by-product dust in the hopper 2 to the silo 20 A feeder 3 for supplying a predetermined amount of incineration fly ash or a by-product dust to the crusher 4 from the hopper 2, a crusher 4 for crushing the crushed fly ash or the by- And a bucket elevator 5 for upwardly transferring the burned fly ash or crushed ash dust crushed through the crusher 4 to the silo 20.

In addition, the silo 20 receives and stores the incineration fly ash or the by-product dust through the transfer device 10, and the valve means 21 is formed at the lower side to control whether the incineration fly ash or the by- .

In addition, the dust collecting device 22 may be installed at a certain point inside or outside the silo 20 in order to collect dust or fine dust generated in the process of transferring the silo of the incineration fly ash or the by-product dust.

Meanwhile, the slicker 30 is provided to supply sludge 20 and a water tank WT, respectively, to receive sludge by burning fly ash or by-product dust and water, The reason for mixing the incineration fly ash or the by-product dust is that the chlorine in the burned fly ash or the fly ash to be achieved in the present invention can be extracted by hydration with water.

Meanwhile, the first centrifugal separator 40 receives the sludge from the slaver 30 and separates the sludge into primary filtrate and primary sludge by centrifugal force. The first centrifugal separator 40 separates the liquid having a relatively low specific gravity from the sludge having a relatively low specific gravity by using the centrifugal force. The primary filtrate, which is a low specific gravity liquid, is transferred to the post tank 50 at the downstream stage.

In addition, the sludge separated from the primary filtrate is discarded through a separate discharge path.

In addition, the post tank 50 receives the primary filtrate from the first centrifugal separator 40, temporarily stores the filtrate, and performs a removal process for removing the heavy metal. In this case, the additives added for removing heavy metals include K ₂ CO ₃ , NaHSO ₃ Or Na ₂ SO ₃ , or a combination thereof.

CaCO ₃ and heavy metals are precipitated by the addition of the additive to form a precipitate. The resulting secondary filtrate and precipitate are transferred to a ceramic filter (60) connected to the downstream end so that the secondary filtrate and the precipitate are separated from each other do.

On the other hand, the secondary filtrate is conveyed to an evaporator 70, which evaporates water in the filtrate to 60% to 80% as heat is applied thereto, so as to produce a chloride in the crystalline state and a residual liquid. 70 includes a first evaporator 71 through which the secondary filtrate flows, a second evaporator 72 through which the secondary filtrate firstly evaporated from the first evaporator 71 flows, and steam supplied from the outside A first heat exchanger 73 for heating the steam and supplying the steam to the second evaporator 72 and a second evaporator 72 for heating the steam after the evaporated gas is introduced into the second evaporator 72, 2 heat exchanger 74 and a condenser 75 for cooling the evaporated gas from the first evaporator 71 to cool it.

At this time, the first evaporator 71 conveys the unfiltered secondary filtrate to the second evaporator 72 so that the evaporation process is performed in the second evaporator 72, and the chloride in the crystalline state that is not evaporated in the second evaporator 72 And the remaining liquid is supplied to the second centrifugal separator 80 by the pump P.

Since the evaporator 70 is constituted by the first evaporator 71 and the second evaporator 72, the heat source used in the second evaporator is reused in the first evaporator, thereby increasing the number of evaporation, So as to further improve productivity.

Meanwhile, the second centrifugal separator 80 is configured to separate the chloride and the residual solution in the crystalline state by supplying the chloride and the residual solution in the crystalline state from the evaporator 70, and as shown in FIG. 3, The chloride and the residual liquid in the crystalline state are supplied from the evaporator 72 to separate them through the centrifugal force.

The chloride in the crystallized state is transferred to a dryer 90 to be described later to produce a complete chloride through reheating. The remaining solution is concentrated through the filtrate concentration tank 91 for a predetermined time and then transferred to the first evaporator 71 or the post tank 50 ) So as to re-acquire the chloride remaining in the remaining liquid.

In FIG. 3, the residual liquid is transferred to the first evaporator 71 to recover the chloride. However, as shown in FIG. 1, the residual liquid is transferred to the post tank 50 to remove the heavy metal in the residual liquid again You may.

The remainder of the chlorine removal process can be used to maximize the yield of chlorides and reduce the amount of wastes, thereby contributing to the reduction of landfill costs and the prevention of environmental pollution.

On the other hand, the dryer (90) is provided to supply chloride to the chloride product silo (S) by supplying chloride in the crystalline state from the second centrifugal separator (80) and drying it.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to those precise embodiments, and many alternatives, modifications, and variations will be apparent to those skilled in the art. I will understand.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: transfer device 20: silo
30: Slayer 40: First centrifuge
50: Post tank 60: Ceramic filter
70: evaporator 80: second centrifugal separator
90: dryer

Claims (3)

A transfer device (10) for transferring burned fly ash generated during incineration of waste or by-produced dust generated in a cement process;
A silo (20) storing an incineration fly ash or a by-product dust through the transfer device and controlling the discharge amount by a valve means (21);
A sludge (30) receiving sludge from the silo (20) and receiving from the water storage tank (WT) and generating sludge mixed with incineration fly ash or water;
A first centrifugal separator (40) for receiving sludge from the slaver (30) and separating the sludge into primary filtrate and primary sludge using centrifugal force;
The primary filtrate is supplied from the first centrifugal separator 40 and stored. When the additive for removing the heavy metal is supplied and mixed with the stored primary filtrate, the heavy metal contained in the primary filtrate reacts with the additive, A post tank 50 in which a secondary filtrate and a precipitate are generated;
A ceramic filter (60) for receiving the secondary filtrate and the precipitate from the post tank (50) and separating them;
A second filtration liquid is supplied from the ceramic filter 60, and water is evaporated to 60% to 80% in the filtrate as heat is applied to the filtrate, thereby producing a chloride and a residual liquid in the crystalline state of sodium chloride or potassium chloride. (70);
A second centrifugal separator (80) for separating the chloride and the residual liquid in the crystalline state from the chlorides and the residual liquid in the crystalline state from the evaporator (70);
And a drier (90) for supplying chloride from the second centrifugal separator (80) to the chloride product silo (S) by supplying the chloride in the crystalline state and drying the chloride to remove the heavy chloride,
The evaporator (70)
A second evaporator 72 to which a secondary filtrate that has not evaporated in the first evaporator 71 flows, and a second evaporator 72 to which steam is supplied to heat the steam, A second heat exchanger 73 for supplying the evaporated gas from the second evaporator 72 to the first evaporator 71 after heating the evaporated gas to the second evaporator 72, 74 and a condenser 75 for cooling the evaporated gas in the first evaporator 71 and cooling it,
The first evaporator 71 conveys the unfiltered secondary filtrate to the second evaporator 72 so that the evaporation process is carried out secondarily and the chloride in the crystalline state that is not evaporated in the second evaporator 72 The secondary filtrate consisting of the residual liquid is supplied to the second centrifugal separator 80,
The second centrifugal separator 80 separates the chloride in the crystalline state from the remaining liquid and then transfers the remaining liquid to the first evaporator 71 or the post tank 50 so that the chloride remaining in the remaining liquid is reused. Characterized in that the process comprises the following steps: delete delete

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