CN113277760A - Method and system for cooperatively treating electrolytic manganese slag in cement kiln - Google Patents

Method and system for cooperatively treating electrolytic manganese slag in cement kiln Download PDF

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CN113277760A
CN113277760A CN202110735911.9A CN202110735911A CN113277760A CN 113277760 A CN113277760 A CN 113277760A CN 202110735911 A CN202110735911 A CN 202110735911A CN 113277760 A CN113277760 A CN 113277760A
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adjusting
coal
electrolytic manganese
manganese slag
channel
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CN113277760B (en
Inventor
季军荣
武双磊
周洲
严金生
刘翠
徐迅
蒋德洪
陈胡星
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South Cement Co Ltd In Chongzuo
Zhejiang University ZJU
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South Cement Co Ltd In Chongzuo
Zhejiang University ZJU
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44—Burning; Melting
    • C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/364—Avoiding environmental pollution during cement-manufacturing
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

The invention discloses a method and a system for treating electrolytic manganese residues in cooperation with a cement kiln, and belongs to the utilization technology of the electrolytic manganese residues. In the novel dry-method cement clinker production line, electrolytic manganese slag and coal are added into a coal mill in proportion, the electrolytic manganese slag and the coal are mixed, dried and simultaneously ground, the obtained coal powder containing the electrolytic manganese slag is stored, the stored coal powder is sprayed into a decomposing furnace through a coal spraying pipe, and the decomposing furnace is enabled to keep normal operation. The invention utilizes the existing precalciner cement clinker production line to carry out innocent treatment and resource utilization on the electrolytic manganese slag.

Description

Method and system for cooperatively treating electrolytic manganese slag in cement kiln
Technical Field
The invention relates to the technical field of electrolytic manganese slag utilization, in particular to a method and a system for cooperatively treating electrolytic manganese slag in a cement kiln.
Background
The cement producing process is mainly "two-grinding one-burning" process, which is to grind the mixture of calcium material and silicon material into raw material, calcine the raw material in kiln system at high temperature to form cement clinker, and then add gypsum to grind and obtain the product. During the calcination process of cement clinker, a large amount of nitrogen oxides (NOx) can be generated, and the related statistical data of environmental protection departments show that the emission of the nitrogen oxides in the cement industry accounts for 10-12% of the total amount of the whole country. The harm of NOx is various, and the NOx enters the deep part of the lung of a human body through breathing to cause bronchitis or emphysema, can also generate photochemical reaction with other pollutants in the atmosphere to form photochemical smog pollution, and is one of the reasons for causing acid rain. Therefore, the emission of NOx in the flue gas of the cement industry is more and more strictly limited in China, and denitration is a large task facing the cement industry.
SNCR is a flue gas denitration technology widely applied in the cement industry in China, and ammonia (NH) is sprayed into a decomposition furnace by utilizing a proper temperature range (900-1100 ℃) in the decomposition furnace at which temperature3) With NO in the flue gasxReaction to form N2And H2And O. But the ammonia water consumption of the technology is large.
The electrolytic manganese slag is acidic waste slag generated by acid leaching, neutralizing, filter pressing and other processes of manganese carbonate ore in the electrolytic manganese production process, and contains SiO2、CaO、Al2O3、Fe2O3、SO3、MgO、R2The main pollutants of the chemical components such as O and heavy metals are heavy metals, ammonia and residual acid, and the chemical components can permeate into surrounding water and soil during stacking, so that the ecological environment and the human health are harmed. China is a big electrolytic manganese production country, electrolytic manganese slag generated in the production process is as high as 1000 million tons/year, and an economic and safe disposal method is not available so far, so that severe disposal pressure is faced.
The cement kiln co-processing of solid waste is a hot spot of research and practice in the cement industry, and the cement kiln co-processing of electrolytic manganese slag is included in the research. The utilization and disposal of manganese slag in the existing cement production comprises the following steps: manganese slag is used as raw material of raw material, and combustion improver and admixture are used as raw material. When the manganese slag is used as a combustion improver component material, the consumption of the manganese slag is small, the treatment amount is very limited, and the requirement for treating the manganese slag cannot be met. When the manganese slag is used as a cement admixture or raw material for disposal, the manganese slag can be massively applied only by carrying out high-temperature calcination and desulfurization on the manganese slag, and generally, pretreatment equipment for the manganese slag needs to be arranged, so that the disposal cost is high. No disposal method which does not need to newly add important equipment and does not influence the cement production of the existing production line exists in the existing cement kiln co-disposal of the electrolytic manganese slag.
CN1837120A discloses a method for producing cement by using electrolytic manganese slag, which utilizes limestone, electrolytic manganese slag, iron powder, fluorite and anthracite to mix and grind into raw meal, and then pelletize and bake into clinker. The method is only suitable for cement production in a vertical kiln, the vertical kiln is backward production process equipment, and the vertical kiln is eliminated in China due to low yield, poor cement quality and the like.
CN201911374625.3 discloses a device and a method for cooperatively processing electrolytic manganese slag based on a dry-process rotary kiln cement production line, and also utilizes equipment such as a rotary kiln, a kiln tail smoke chamber, a decomposing furnace and the like for cement production, and is also provided with a metering, conveying and state entering device for adding manganese slag into the kiln tail smoke chamber. The electrolytic manganese slag is heated and decomposed in the kiln tail smoke chamber, the inorganic components of the electrolytic manganese slag become cement clinker components, and the ammonia enters the decomposing furnace after being volatilized, so that the denitration effect is also realized. However, the method has the following disadvantages: (1) the original manganese slag containing water is directly added from a kiln tail smoke chamber, and cannot be uniformly dispersed, so that the manganese slag and other materials cannot be uniformly mixed and reacted, and the quality of cement clinker is influenced; (2) the moisture in the manganese slag is high, and after the manganese slag is added into a kiln tail smoke chamber, the moisture is evaporated, and more heat needs to be absorbed, so that the heat consumption is improved, the thermal regulation is disturbed, and the normal production is influenced; (3) the flow field characteristic of the kiln tail smoke chamber and the characteristic of NOx formation and reduction reaction in the cement kiln almost have no effect of ammonia in the manganese slag on reducing NOx in smoke.
CN 201610840058.6A cement kiln compound coal injection combustion improver and application thereof, discloses that the combustion improver comprises the following raw materials in proportion: 25-40% of manganese slag, 15-25% of red mud, 20-35% of lead-zinc tailings, 5-10% of rare earth tailings, 8-20% of nickel slag and 2-6% of industrial permanganate. The raw materials are weighed and mixed according to a proportion, then the raw materials and raw coal are fed into a mill according to a mass proportion, and the raw materials and the raw coal are jointly ground into mixed powder which is sent into a cement kiln system. Or the raw materials are weighed and mixed according to the proportion, are independently ground into powder in a grinding machine, and are mixed with the coal powder. When the coal for cement burning is lignite, the mass consumption of the composite coal injection combustion improver for the cement kiln is 0.20.6% of the mass of the coal; when the coal is bituminous coal, the mass consumption of the composite coal injection combustion improver for the cement kiln is 0.4-0.8% of the mass of the coal; when the coal is anthracite, the mass consumption of the composite coal injection combustion improver for the cement kiln is 0.5-1.2% of the mass of the coal. In the patent, the manganese slag is used as one of the components of the combustion improver to be mixed with the coal powder, but the combustion improver is low in usage amount, so that the manganese slag cannot be treated on a large scale.
If the defects of the conventional cement kiln for co-processing electrolytic manganese slag can be overcome, inorganic components in the manganese slag become components of cement clinker, and simultaneously, ammonia in the manganese slag is effectively utilized to remove NOx in flue gas, so that the manganese slag is changed into valuable, and multiple effects of protecting the environment, saving resources, reducing the production cost of cement and the like are achieved.
Disclosure of Invention
The invention aims to solve the problems and provide a method and a system for cooperatively treating electrolytic manganese residues by a cement kiln.
A method for cooperatively treating electrolytic manganese slag by a cement kiln is characterized in that in a novel dry-process cement clinker production line, the electrolytic manganese slag and coal are proportionally added into a coal mill, the electrolytic manganese slag and the coal are mixed, dried and simultaneously ground, the obtained coal powder containing the electrolytic manganese slag is stored, and the stored coal powder is sprayed into a decomposing furnace through a coal spraying pipe, so that the decomposing furnace is kept to normally operate.
Preferably, the water content of the electrolytic manganese slag is 15-30%, and the addition amount of the electrolytic manganese slag is 5-15% of that of the coal.
The system comprises a pulverized coal burner, wherein the pulverized coal burner sprays pulverized coal obtained by uniformly mixing and levigating electrolytic manganese slag to be treated and coal in a coal mill into an electrolytic furnace of a novel dry cement clinker production line for combustion, so that the synergistic treatment of the electrolytic manganese slag is realized.
The pulverized coal burner comprises a central ignition pipe, a central air pipe, a pulverized coal pipe and a shell which are coaxially sleeved from inside to outside in sequence, and a channel which is formed by surrounding the pulverized coal burner from the center to the outside in sequence is a central ignition channel, a central air channel, a pulverized coal channel and an air adjusting channel; the outlet end of the air adjusting channel is provided with an air adjusting structure, and the air adjusting structure comprises adjusting blades, a guide rail arranged along the length direction of the air adjusting channel, a guide block and an adjusting push rod device; the adjusting blade is an alloy sheet with toughness and heat resistance; the guide rails are uniformly arranged along the circumferential direction of the air adjusting channel at intervals, each guide rail is composed of corresponding guide grooves which are respectively arranged on the pulverized coal pipe and the shell, and one end of each guide rail obliquely extends relative to the curved surface of the air adjusting channel and relatively penetrates through the outlet end of each guide rail; the guide blocks are positioned at the other end of the guide rail and correspond to the guide rail one by one, and guide holes for adjusting the blades to pass through are formed in the guide blocks; one end of each adjusting blade is arranged on the guide rail, the length edge ends of the adjusting blades are respectively arranged in the corresponding guide grooves in a sliding manner, the adjusting blades can move along the guide rail, and the other ends of the adjusting blades penetrate through the guide blocks and are parallel and coplanar with the central axis of the adjusting air channel; the adjusting push rod device comprises a driving device, a push rod and a push ring, the push ring is arranged in an annular mode and is connected with one end, far away from the guide rail, of the adjusting blade, the push rod is connected with the push ring at one end in the circumferential interval of the adjusting air channel, the other end of the push rod is connected with the driving device, the driving device enables the adjusting blade connected with the push ring to move synchronously through pushing the push rod, so that the adjusting blade can move along the guide rail, and the adjusting air channel is formed into a spiral air outlet channel at intervals.
Preferably, the guide track is 8-16cm long.
Preferably, the thickness of the adjusting blade is 0.1-0.5 mm.
Preferably, the length edge end of the adjusting blade is slidably sleeved on the sliding part, the sliding part is correspondingly installed in the guide groove, and the sliding part is internally provided with an elastic clamping opening corresponding to the adjusting blade and an adjusting cavity which is positioned in the sliding part and connected with the clamping opening.
Preferably, including two sets of regulation push rod devices, every group regulation push rod device is connected the regulation blade that the interval set up respectively to can promote respectively that the regulation blade moves along the guide track.
Preferably, the guide block at least separates the air adjusting channel into two channels, and the air inlet end of the guide block relative to the air adjusting channel is of a sharp-angled structure.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. according to the invention, the coal mill can dry the moisture in the manganese slag through the high-temperature flue gas from the grate cooler, so that the link of independently drying the moisture in the manganese slag is reduced.
2. The manganese slag is mixed into the coal according to the proportion, and is mixed and ground in the coal mill, so that the uniformity and the stability of the manganese slag added into a cement kiln system are fully ensured.
3. The coal powder doped with the manganese slag is added into the decomposing furnace through the coal injection pipe, so that on one hand, the heat required by the decomposition of the carbonate can be ensured, and simultaneously, ammonia gas formed by volatilization of ammonia in the manganese slag and NOx are subjected to chemical reaction in the decomposing furnace, so that a good auxiliary denitration effect is achieved, the using amount of ammonia water can be saved, and the denitration cost is saved.
4. In the invention, the inorganic components in the electrolytic manganese slag finally become the components of the cement clinker, and the heavy metal also has the effect of promoting calcination and is well solidified in the clinker.
5. The invention can carry out harmless treatment on the manganese slag in a large scale and at low cost. The output of the cement clinker of the pre-decomposition kiln is generally up to more than 5000 tons/d, and if 10 percent of the cement clinker is added into the coal powder of the decomposition furnace, the annual amount of the manganese slag is more than 7000 tons.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
FIG. 2 is a schematic view of the burner structure for the decomposing furnace of the present invention.
FIG. 3 is a schematic cross-sectional view of one end of a burner port of the burner of the present invention.
Fig. 4 is a schematic view of the structure of the wind adjusting device of the invention.
Fig. 5 is a schematic sectional view taken along line a-a in fig. 3.
Fig. 6 is a schematic view of another state structure in fig. 5.
Fig. 7 is a schematic cross-sectional structure of an adjusting blade of the present invention on a guide rail.
FIG. 8 is a circumferential development of an embodiment of the corresponding guide rail on the coal powder pipe of the present invention.
FIG. 9 is a circumferential development of a corresponding guide track on the coal powder pipe according to another embodiment of the invention.
In the attached drawing, 1-electrolytic manganese slag bin, 2-decomposing furnace raw coal bin, 3-decomposing furnace coal mill, 4-decomposing furnace coal powder bin, 5-coal powder burner, 6-rotary kiln raw coal bin, 7-rotary kiln coal mill, 8-rotary kiln coal powder bin, 9-rotary kiln burner, 10-grate cooler, 11-rotary kiln, 12-decomposing furnace, 13-fifth-stage cyclone preheater, 14-fourth-stage cyclone preheater, 15-third-stage cyclone preheater, 16-second-stage cyclone preheater, 17-first-stage cyclone preheater, 51-central ignition tube, 52-central air pipe, 53-coal powder pipe, 54-shell, 55-central ignition channel, 56-central air channel, 57-coal powder channel, 58-regulating air channel, 58-coal powder channel, 59-adjusting wind structure, 591-adjusting blade, 592-guiding rail, 593-guiding block, 594-pushing ring, 595-pushing rod, 596-driving device, 597-sliding piece, 598-adjusting cavity, 599-elastic clamping opening, 510-burner body, 520-coal inlet pipe, 530-air inlet pipe and 540-fuel oil pipe.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
The electrolytic manganese slag is used as acid waste slag in the production of electrolytic manganese and is listed as a II-class common industrial solid waste, and the electrolytic manganese slag contains Al2O3、SiO2、Fe2O3CaO and SO3And the main components also contain more heavy metal and ammonia nitrogen, which is not beneficial to the large-scale reutilization of the electrolytic manganese slag.
The invention relates to a method for cooperatively treating electrolytic manganese slag by a cement kiln, which is characterized in that in a novel dry-process cement clinker production line, the electrolytic manganese slag is proportionally added into a coal mill, the two are mixed and dried and simultaneously ground, the obtained coal powder containing the electrolytic manganese slag is stored, the stored coal powder is sprayed into a decomposing furnace 12 through a coal spraying pipe, the decomposing furnace 12 is enabled to keep normal operation, and the cooperative treatment of the electrolytic manganese slag is realized. The electrolytic manganese slag accounts for 5-15% of the weight of the coal. The coal powder is sprayed normally, so that the electrolytic manganese slag is treated cooperatively without altering available cement producing apparatus, the electrolytic manganese slag is stoved and mixed into coal powder in a coal mill, and the coal powder is run normally. Compared with the prior art, complex pretreatment such as drying, deamination and the like is not needed for the manganese slag, and the method can be used for performing cooperative treatment on the existing novel dry-process cement clinker production line, and has low cost and high efficiency.
The invention sprays coal powder and electrolytic manganese slag powder into the decomposing furnace 12 through the coal spraying pipe, the coal powder is burnt in the decomposing furnace 12, the generated heat is used for decomposing carbonate, and simultaneously ammonia in the electrolytic manganese slag is volatilized; the ammonia gas formed is reacted with NO produced mainly from the fuel in the decomposing furnace 12xChemical timely reaction occurs to generate a denitration effect; the use of ammonia water in the decomposing furnace 12 can be effectively reduced; the electrolytic manganese slag is fully mixed with other materials in the decomposing furnace 12, and finally becomes the component of the cement clinker after being calcined by the kiln system.
Example 1
Fig. 1 is a schematic process flow diagram in the present embodiment, in which the dashed lines indicate the gas and material directions, and the solid lines indicate the material directions. The coal disposal equipment of the original decomposing furnace 12 in the novel dry-method cement clinker production line comprises: the rotary kiln coal processing equipment comprises a raw coal bin 2 of the decomposing furnace, a coal mill 3 of the decomposing furnace and a coal powder bin 4 of the decomposing furnace, and comprises a raw coal bin 6 of the rotary kiln, a coal mill 7 of the rotary kiln (the coal mill of the rotary kiln and the coal mill of the decomposing furnace can commonly share one mill), a coal powder bin 8 of the rotary kiln and a burner 9 of the rotary kiln. The electrolytic manganese slag bin 1 is used for pre-storing the electrolytic manganese slag. The electrolytic manganese slag bin 1, the raw coal bin 2 of the decomposing furnace, the coal mill 3 of the decomposing furnace, the coal powder bin 4 of the decomposing furnace, the coal powder burner 5 and the decomposing furnace 12 form a main unit for the cooperative treatment of the electrolytic manganese slag. Wherein, the decomposing furnace 12 is connected with a five-stage cyclone preheater which is respectively a fifth-stage cyclone preheater 13, a fourth-stage cyclone preheater 14, a third-stage cyclone preheater 15, a second-stage cyclone preheater 16 and a first-stage cyclone preheater 17; the decomposing furnace 12 is communicated with the tail of the rotary kiln 11, the head of the rotary kiln 11 is provided with a rotary kiln burner 9, and the head of the rotary kiln 11 corresponds to the grate cooler 10.
On a production line of novel dry-process cement clinker with 5000 tons of daily output, 10 percent of electrolytic manganese slag is mixed into coal through a metering device and a conveying device, and the water content of the electrolytic manganese slag is about 22 percent. Specifically, the transported electrolytic manganese slag to be treated is firstly stored in a manganese slag bin 1, the electrolytic manganese slag is transported into a coal mill through a metering device and a transporting device and is treated together with raw coal, high-temperature waste gas of a rotary kiln is introduced into the coal mill, and the manganese slag is mixed with coal powder, dried and ground simultaneously. The finely ground coal dust containing manganese slag is stored in a coal dust bunker dedicated for combustion in the decomposing furnace 12. The coal powder in the coal powder bin is sprayed into the decomposing furnace 12 through a coal spraying pipe of the decomposing furnace 12, the coal powder is combusted in the decomposing furnace 12, and the generated heat is used for decomposing carbonate.
The ammonia nitrogen in the manganese slag is heated and volatilized and is mixed with NO in the decomposing furnace 12xAnd the contact reaction plays a role in assisting denitration. The raw material of the decomposing furnace 12 enters a rotary kiln and is calcined into cement clinker at high temperature, and Al in manganese slag2O3、SiO2、Fe2O3And inorganic components such as CaO, etc. become cement clinker components. The specific value of cement clinker is KH 0.910,n is 2.48, P is 1.43, and the coal consumption is 100kg (standard coal), wherein the proportion in the decomposition furnace 12 is 40%. NO in flue gas before treatment of manganese slagxIs 300mg/m3NO in the flue gas after the manganese slag is treatedxIs 255mg/m3。
Example 2
On a production line of novel dry-process cement clinker with 5000 tons of daily output, 5 percent of electrolytic manganese slag is mixed into coal through a metering device and a conveying device, and the water content of the electrolytic manganese slag is about 30 percent. Specifically, the transported electrolytic manganese slag to be treated is firstly stored in a manganese slag bin 1, the electrolytic manganese slag is transported into a coal mill through a metering device and a transporting device and is treated together with raw coal, high-temperature waste gas of a rotary kiln is introduced into the coal mill, and the manganese slag is mixed with coal powder, dried and ground simultaneously. The finely ground coal dust containing manganese slag is stored in a coal dust bunker dedicated for combustion in the decomposing furnace 12. The coal powder in the coal powder bin is sprayed into the decomposing furnace 12 through a coal spraying pipe of the decomposing furnace 12, the coal powder is combusted in the decomposing furnace 12, and the generated heat is used for decomposing carbonate.
The ammonia nitrogen in the manganese slag is heated and volatilized and is mixed with NO in the decomposing furnace 12xAnd the contact reaction plays a role in assisting denitration. The raw material of the decomposing furnace 12 enters a rotary kiln and is calcined into cement clinker and Al in manganese slag through high temperature2O3、SiO2、Fe2O3And inorganic components such as CaO, etc. become cement clinker components. The specific values of cement clinker are KH 0.920, n 2.25, P1.53, coal consumption 102kg (standard coal), and the proportion in the decomposing furnace 12 is 41%. NO in flue gas before treatment of manganese slagxIs 220mg/m3NO in the flue gas after the manganese slag is treatedxIs 190mg/m3。
Example 3
On a production line of novel dry-process cement clinker with 5000 tons of daily output, 15 percent of electrolytic manganese slag is mixed into coal through a metering device and a conveying device, and the water content of the electrolytic manganese slag is about 15 percent. Specifically, the transported electrolytic manganese slag to be treated is firstly stored in a manganese slag bin 1, the electrolytic manganese slag is transported into a coal mill through a metering device and a transporting device and is treated together with raw coal, high-temperature waste gas of a rotary kiln is introduced into the coal mill, and the manganese slag is mixed with coal powder, dried and ground simultaneously. The finely ground coal dust containing manganese slag is stored in a coal dust bunker dedicated for combustion in the decomposing furnace 12. The coal powder in the coal powder bin is sprayed into the decomposing furnace 12 through a coal spraying pipe of the decomposing furnace 12, the coal powder is combusted in the decomposing furnace 12, and the generated heat is used for decomposing carbonate.
The ammonia nitrogen in the manganese slag is heated and volatilized and is mixed with NO in the decomposing furnace 12xAnd the contact reaction plays a role in assisting denitration. The sulfide in the manganese slag reacts with the carbon at the same time, so that the effect of calcination and desulfurization is achieved. The raw material of the decomposing furnace 12 enters a rotary kiln and is calcined into cement clinker and Al in manganese slag through high temperature2O3、SiO2、Fe2O3And inorganic components such as CaO, etc. become cement clinker components. The specific values of cement clinker are KH 0.930, n 2.25, P1.57, and coal consumption 105kg (standard coal), wherein the proportion in the decomposing furnace 12 is 42%. NO in flue gas before treatment of manganese slagxIs 240mg/m3NO in the flue gas after the manganese slag is treatedxIs 185mg/m3。
The existing research shows that the electrolytic manganese slag contains sulfate and can partially replace gypsum to be used as a retarder of cement clinker, and at the moment, heavy metals in the manganese slag can be solidified in the cement hydration hardening process, so that the harm of the heavy metals to the environment is reduced. However, the manganese slag contains ammonia nitrogen and other substances, which have obvious negative effects on the cement performance, and in practice, the doping amount of the electrolytic manganese slag as a retarder is limited. After the electrolytic manganese slag is subjected to high-temperature desulfurization and deamination nitrogen treatment, the electrolytic manganese slag can be used as a cement admixture, the addition amount can reach more than 30 percent, however, the manganese slag needs to be subjected to high-temperature pretreatment, the process is complex, and the treatment cost is high.
In the invention, the electrolytic manganese slag is proportionally added into the coal mill in the novel dry-process cement clinker production line, the two are mixed and dried while being milled, and are uniformly mixed and milled with the coal, the obtained coal powder containing the electrolytic manganese slag is stored, the stored coal powder is sprayed into the decomposing furnace through the coal spraying pipe, the decomposing furnace is enabled to keep normal operation, and the synergistic treatment of the electrolytic manganese slag is realized. The method does not need to change the existing cement production equipment, does not need to carry out complicated pretreatment such as drying, deamination and the like on the manganese slag, can carry out cooperative treatment on the existing novel dry-process cement clinker production line, and has low cost and high efficiency.
The system comprises a pulverized coal burner 5, wherein the pulverized coal burner 5 is used for spraying pulverized coal obtained by uniformly mixing and grinding electrolytic manganese slag to be treated and coal in a coal mill into an electrolytic furnace of a novel dry-process cement clinker production line for combustion, so that the synergistic treatment of the electrolytic manganese slag is realized. Here, the system for disposing the electrolytic manganese residues in a coordinated manner can be used for adjusting the injection condition of the pulverized coal through the pulverized coal burner 5 instead of disposing the electrolytic manganese residues in a coordinated manner by using the existing process equipment, specifically, the adjustment air channel 58 is arranged to adjust the injected pulverized coal to be more uniformly mixed with air, so that the electrolytic manganese residues contained in the pulverized coal can be uniformly diffused upwards along the decomposing furnace 12 along with the pulverized coal, and ammonia gas generated by decomposing the electrolytic manganese residues can be used for NOxThe contact reaction plays a role in assisting denitration, avoids ammonia gas generated by decomposing electrolytic manganese slag from being concentrated and unevenly distributed, and enhances the denitration effect, thereby reducing the use of ammonia water.
As shown in fig. 2, the external structure of the pulverized coal burner 5 includes a burner body 510, a coal inlet pipe 520, an air inlet pipe 530, and a fuel pipe 540, wherein the burner body 510 is the core of the pulverized coal burner 5, the coal inlet pipe 520 is connected to the pulverized coal pipe 53, the air inlet pipe 530 is connected to the central air passage 56 and the adjusting air passage 58, and the fuel pipe 540 is connected to the central point fire tube 51.
As shown in fig. 3, the pulverized coal burner 5 or the burner body 510 includes a central fire tube 51, a central air tube 52, a pulverized coal tube 53 and a casing 54 coaxially sleeved from inside to outside, and the passages of the pulverized coal burner 5 enclosed from the center to the outside are a central ignition passage 55, a central air passage 56, a pulverized coal passage 57 and an adjusting air passage 58. The outlet end of the adjusting wind channel 58 is provided with an adjusting wind structure 59, and the adjusting wind structure 59 comprises an adjusting blade 591, a guide rail 592 arranged along the length direction of the adjusting wind channel 58, a guide block 593 and an adjusting push rod 595 device.
As shown in fig. 4 to 6, the tuning blade 591 is an alloy sheet having toughness and heat resistance. The thickness of the adjustment blade 591 is 0.1-0.5 mm. The guide rails 592 are circumferentially and uniformly spaced along the regulated air passage 58, the guide rails 592 are formed of corresponding guide grooves respectively provided on the pulverized coal pipe 53 and the casing 54, and one end of the guide rails 592 extends obliquely with respect to the curved surface of the regulated air passage 58 and relatively penetrates the outlet end of the guide rails 592. The guide block 593 is located at the other end of the guide rail 592 and corresponds to the guide rail 592 one to one, and a guide hole for passing the adjustment blade 591 is provided on the guide block 593. The adjusting blade 591 is provided with one end on the guide rail 592 and the length sides of the adjusting blade 591 are respectively and slidably arranged in the corresponding guide slots, the adjusting blade 591 can move along the guide rail 592, and the other end of the adjusting blade 591 passes through the guide block 593 and is parallel and coplanar with respect to the central axis of the adjusting wind channel 58.
Wherein, the adjusting push rod 595 device includes a driving device 596, push rods 595 and push rings 594, the push rings 594 are arranged annularly and connected with one end of the adjusting blade 591 far from the guide track 592, the push rods 595 are spaced circumferentially along the adjusting wind channel 58, one end of the push rods 595 is connected with the push rings 594, the other end of the push rods 595 is connected with the driving device 596, the driving device 596 enables the adjusting blade 591 connected with the push rings 594 to move synchronously by pushing the push rods 595, so that the adjusting blade 591 can move along the guide track 592 and the adjusting wind channel 58 is spaced to form a spiral wind channel.
Here, two sets of adjusting push rods 595 are included, each set of adjusting push rods 595 being connected to a separate adjusting blade 591 and being capable of pushing the adjusting blade 591 along the guide track 592. The guide block 593 at least divides the air adjusting channel 58 into two channels, and the air inlet end of the guide block 593 opposite to the air adjusting channel 58 is of a sharp-angled structure.
As shown in fig. 7, the length side end of the adjusting blade 591 is slidably sleeved on a sliding member 597, the sliding member 597 is correspondingly installed in the guiding slot, an elastic clamping port 599 corresponding to the adjusting blade 591 is arranged in the sliding member 597, and an adjusting cavity 598 connected with the clamping port is arranged in the sliding member 597. The adjustment cavity 598 allows the adjustment blade 591 to be provided with a certain margin at the length end thereof, so that the adjustment blade 591 is prevented from being locked at the guide track 592 due to insufficient width when moving and deforming along the guide track 592.
Fig. 8 is a circumferential development of the pulverized coal pipe 53 corresponding to the guide rail 592, the guide rail 592 is 15cm long, and the guide rail 592 is spirally disposed along the wall of the pulverized coal pipe 53, so that when the adjusting blade 591 is pushed along the guide rail 592, the guide rail 592 plays a role in deforming the adjusting blade 591, that is, the spiral outlet of the adjusting wind channel 58 formed by the adjusting blade 591 is formed under the function of the guide rail 592.
In fig. 9, a guide rail 592 different from that of fig. 8 is provided, the guide rail 592 is 12cm long; the guide rails 592 are arranged first parallel and then helically along the wall of the pulverized coal pipe 53, and the end of the guide rails 592 is helically angled more. The arrangement of the guide rails 592 is embodied as a guide table for adjusting the deformation adjustment of the blade 591, and in particular, different guide rails 592 may enable the blade 591 to be deformed differently to form different outlets of the adjusting air passage 58, thereby allowing different whirling winds.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.

Claims (8)

1. The method for treating the electrolytic manganese slag by the aid of the cement kiln is characterized by comprising the following steps: in the novel dry-method cement clinker production line, electrolytic manganese slag and coal are added into a coal mill in proportion, the electrolytic manganese slag and the coal are mixed, dried and simultaneously ground, the obtained coal powder containing the electrolytic manganese slag is stored, the stored coal powder is sprayed into a decomposing furnace through a coal spraying pipe, and the decomposing furnace is enabled to keep normal operation.
2. The method for the cement kiln co-processing of the electrolytic manganese slag according to claim 1, wherein: the water content of the electrolytic manganese slag is 15-30%, and the adding amount of the electrolytic manganese slag is 5-15% of that of the coal.
3. The system for the cement kiln to cooperatively treat the electrolytic manganese slag is characterized in that: the device comprises a pulverized coal burner, wherein the pulverized coal burner sprays pulverized coal obtained by uniformly mixing and grinding electrolytic manganese slag to be treated and coal added in a coal mill into an electrolytic furnace of a novel dry-process cement clinker production line for combustion, so that the electrolytic manganese slag is co-treated;
the pulverized coal burner comprises a central ignition pipe, a central air pipe, a pulverized coal pipe and a shell which are coaxially sleeved from inside to outside in sequence, and a channel which is formed by surrounding the pulverized coal burner from the center to the outside in sequence is a central ignition channel, a central air channel, a pulverized coal channel and an air adjusting channel; the outlet end of the air adjusting channel is provided with an air adjusting structure, and the air adjusting structure comprises adjusting blades, a guide rail arranged along the length direction of the air adjusting channel, a guide block and an adjusting push rod device; the adjusting blade is an alloy sheet with toughness and heat resistance; the guide rails are uniformly arranged along the circumferential direction of the air adjusting channel at intervals, each guide rail is composed of corresponding guide grooves which are respectively arranged on the pulverized coal pipe and the shell, and one end of each guide rail obliquely extends relative to the curved surface of the air adjusting channel and relatively penetrates through the outlet end of each guide rail; the guide blocks are positioned at the other end of the guide rail and correspond to the guide rail one by one, and guide holes for adjusting the blades to pass through are formed in the guide blocks; one end of each adjusting blade is arranged on the guide rail, the length edge ends of the adjusting blades are respectively arranged in the corresponding guide grooves in a sliding manner, the adjusting blades can move along the guide rail, and the other ends of the adjusting blades penetrate through the guide blocks and are parallel and coplanar with the central axis of the adjusting air channel; the adjusting push rod device comprises a driving device, a push rod and a push ring, the push ring is arranged in an annular mode and is connected with one end, far away from the guide rail, of the adjusting blade, the push rod is connected with the push ring at one end in the circumferential interval of the adjusting air channel, the other end of the push rod is connected with the driving device, the driving device enables the adjusting blade connected with the push ring to move synchronously through pushing the push rod, so that the adjusting blade can move along the guide rail, and the adjusting air channel is formed into a spiral air outlet channel at intervals.
4. The system for the co-treatment of the electrolytic manganese residues by the cement kiln as claimed in claim 3, wherein: the length of the guide track is 8-16 cm.
5. The system for the co-treatment of the electrolytic manganese residues by the cement kiln as claimed in claim 3, wherein: the thickness of the adjusting blade is 0.1-0.5 mm.
6. The system for the co-treatment of the electrolytic manganese residues by the cement kiln as claimed in claim 3, wherein: the adjustable blade is characterized in that the length side end of the adjustable blade is slidably sleeved on the sliding part, the sliding part is correspondingly installed in the guide groove, and the sliding part is internally provided with an elastic clamping opening corresponding to the adjustable blade and an adjusting cavity which is positioned in the sliding part and connected with the clamping opening.
7. The system for the co-treatment of the electrolytic manganese residues by the cement kiln as claimed in claim 3, wherein: the adjusting device comprises two groups of adjusting push rod devices, wherein each group of adjusting push rod devices is respectively connected with adjusting blades arranged at intervals and can respectively push the adjusting blades to move along the guide tracks.
8. The system for the co-treatment of the electrolytic manganese residues by the cement kiln as claimed in claim 3, wherein: the guide block at least separates the air adjusting channel into two channels, and the air inlet end of the guide block relative to the air adjusting channel is of a closed angle structure.
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