CN110921958A - Acid-making wastewater recycling system and method by sintering flue gas activated carbon desulfurization process - Google Patents

Acid-making wastewater recycling system and method by sintering flue gas activated carbon desulfurization process Download PDF

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CN110921958A
CN110921958A CN201911303622.0A CN201911303622A CN110921958A CN 110921958 A CN110921958 A CN 110921958A CN 201911303622 A CN201911303622 A CN 201911303622A CN 110921958 A CN110921958 A CN 110921958A
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reaction tank
wastewater
activated carbon
ammonium sulfate
sludge
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杜健敏
颜斌
卢丽君
魏海
张垒
刘海英
吕军
付本全
陆婷
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Wuhan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
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    • C01B32/36—Reactivation or regeneration
    • C—CHEMISTRY; METALLURGY
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    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/24—Sulfates of ammonium
    • C01C1/242—Preparation from ammonia and sulfuric acid or sulfur trioxide
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    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/101—Sulfur compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2101/203—Iron or iron compound
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    • C02F2101/10—Inorganic compounds
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    • C02F2101/22—Chromium or chromium compounds, e.g. chromates
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    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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Abstract

The invention discloses a resource system and a resource method for acid-making wastewater of a sintering flue gas activated carbon desulfurization process; the system comprises a first-stage reaction tank, wherein the first-stage reaction tank is sequentially connected with a second-stage reaction tank, a third-stage reaction tank, a preheater, a climbing film heater, a vacuum evaporator, a crystallizer, a centrifugal machine and a multilayer fluidized bed dryer through a main pipeline; the method comprises the following steps of firstly pretreating the acid making wastewater, and then recycling the sulfur and nitrogen elements: finally drying the activated carbon sludge, the heavy metal sludge and the ammonium sulfate crystal particles; the invention has small occupied area, small investment and easy field implementation.

Description

Acid-making wastewater recycling system and method by sintering flue gas activated carbon desulfurization process
Technical Field
The invention relates to the field of metallurgical waste gas treatment, in particular to a resource system and a resource method for acid-making waste water of a sintering flue gas activated carbon desulfurization process.
Background
The sintering flue gas of the steel plant is the second largest waste gas pollution source next to the power industry, the flue gas quantity of the sintering plant is large, and about 4000m is discharged when 1 ton of sintering ore is produced3Flue gas; containing SO2High concentration of 70% SO of iron and steel enterprises2Discharged from a sintering workshop and the concentration of the waste gas is about 500-1000 mg/m3. The early sintering flue gas desulfurization technology mainly comprises a wet method and a semi-dry method, and can meet the emission requirements specified by the state, however, with the popularization of the technology, the two methods gradually expose the problems of waste water generation, serious corrosion and difficult utilization of byproducts. In recent years, an activated carbon desulfurization process is popular, the defects are well avoided, the by-product can be prepared into concentrated sulfuric acid, and large steel factories such as Bao steel, Tai steel, Handover steel, Wu steel and Zhanjiang steel adopt the process to desulfurize sintering flue gas.
Activated carbon adsorption of SO in flue gas2The gas which is adsorbed after the saturation is carried out is resolved from the active carbon pores to become SO2Rich gas containing 10-20% SO2、1～5％NH3，1000～5000mg/m3The activated carbon dust also contains a small amount of HCl, HF, heavy metals and the like. Before the rich gas is used for preparing concentrated sulfuric acid, the rich gas is washed, and SO is generated in the process of washing the rich gas2、NH3And the active carbon dust and other substances enter the washing liquid to become acid-making wastewater. The detection of acid-making wastewater of sintering flue gas of a certain steel mill in the North of China smelting shows that the pH is less than 1, SS6000mg/L, ammonia nitrogen is 5000mg/L, and Cl is added-24000,H2SO415000 it also contains heavy metals such as iron, mercury, lead, and zinc. The waste water has strong acidity and high salinity and can not be directly discharged.
At present, the research aiming at the acid making wastewater is mainly to realize the standard discharge, and the invention provides an acid making wastewater treatment system for Zhongzhu Changtianyao, which treats the acid making wastewater to the standard discharge state by adopting the modes of magnetic coagulation sedimentation, filtration and membrane absorption. In the north of China metallurgy, respective treatment processes and engineering design suggestions are provided for heavy metal, ammonia nitrogen and salt.
A steel mill discloses a dewatering method of sludge containing carbon powder in acid-making wastewater, which improves the dewatering performance of activated carbon by adding medicament into activated carbon for modification and deep flocculation. By adjusting the pH value and adding organic sulfur, the content of 7 heavy metal ions in the wastewater reaches the first class A standard of the comprehensive discharge standard of Shanghai municipal sewage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a system and a method for recycling acid-making wastewater of a sintering flue gas activated carbon desulfurization process, and solves the problem of recycling suspended matters, heavy metals, sulfur and nitrogen in the acid-making wastewater. By using the method of the device, zero discharge of the acid-making wastewater of the sintering flue gas activated carbon desulfurization process can be realized, the sulfur and nitrogen elements in the wastewater can be changed into valuable ammonium sulfate products, and the heavy metal and suspended matter activated carbon powder can be respectively separated from the wastewater, so that the resource utilization value is respectively realized.
In order to achieve the purpose, the invention designs a recycling system for acid-making wastewater of a sintering flue gas activated carbon desulfurization process, which comprises a primary reaction tank, wherein the primary reaction tank is sequentially connected with a secondary reaction tank, a tertiary reaction tank, a preheater, a climbing film heater, a vacuum evaporator, a crystallizer, a centrifuge and a multilayer fluidized bed dryer through a main pipeline; the secondary reaction tank is sequentially connected with a secondary sludge dehydrator and a multilayer fluidized bed dryer through a secondary branch pipe; the multi-layer fluidized bed dryer is internally provided with a primary filter sieve, a secondary filter sieve and a tertiary filter sieve from top to bottom respectively; the bottom of the multilayer fluidized bed dryer is provided with a hot air pipe;
the first-stage filter sieve, the second-stage filter sieve and the third-stage filter sieve respectively correspond to the second-stage sludge dewatering machine, the first-stage sludge dewatering machine and the centrifugal machine, and the other ends of the first-stage filter sieve, the second-stage filter sieve and the third-stage filter sieve sequentially correspond to an ammonium sulfate outlet, an activated carbon powder outlet and a heavy metal outlet.
Further, the primary sludge dewatering machine is communicated with the primary reaction tank through a primary return pipe.
And furthermore, the secondary sludge dewatering machine is communicated with the secondary reaction tank through a secondary return pipe.
Still further, the centrifuge is communicated with the secondary reaction tank through a centrifugal return pipe.
The invention provides a method for recycling acid-making wastewater by using the device, which comprises the following steps:
1) the acid-making wastewater is pretreated firstly,
a. introducing 10-15% ammonia water into the primary reaction tank, uniformly mixing the ammonia water and the acid-making wastewater by using a stirrer, detecting the pH value of the wastewater to 5.5-7.5, stopping stirring and adding the ammonia water, allowing the reaction tank to stand and sink for 5-10min, precipitating suspended activated carbon powder in the wastewater, and allowing the wastewater to enter a primary sludge dehydrator to dehydrate to obtain activated carbon sludge for later use;
b. introducing the supernatant into a secondary reaction tank, starting a stirrer, continuously introducing ammonia water with the concentration of 10-15% until the pH value is 8.5-9.5, stopping adding the ammonia water, standing for precipitation for 3-8min to precipitate metal ions in the wastewater, introducing the wastewater into a secondary sludge dehydrator 9, and dehydrating to obtain heavy metal sludge for later use;
c. leading the supernatant to a three-stage reaction tank, adding hydrogen peroxide or aerating, controlling the molar ratio of hydrogen peroxide to sulfite ions in the hydrogen peroxide to be 1.0-1.2: 1, oxidizing sulfite ions in the acid-making wastewater, reacting for 3-5min until the separation of suspended matters and heavy metals is completed in the acid-making wastewater, and leaving an ammonium sulfate solution for later use;
the separation principle of the activated carbon powder is as follows: on one hand, larger active carbon powder can be naturally settled, on the other hand, iron and aluminum ions in the wastewater can generate ferric hydroxide and aluminum hydroxide precipitates by controlling the pH value to be 5.5-7.5, and the precipitates can carry fine-particle active carbon powder to be settled together, thereby achieving the purpose of completely removing the active carbon powder.
Separation principle of heavy metals: adjusting pH to 8.5-9.5 to make heavy metal ions such As Pb, As, Ni, Hg, Cr, etc. react with hydroxide radical to generate precipitate for separation.
② recycling the sulfur and nitrogen elements:
a. the obtained wastewater is sequentially introduced into a preheater to increase the concentration of ammonium sulfate to 10-15 percent, enters a film-rising heater 5 to increase the concentration of ammonium sulfate to 15-25 percent,
b. then the wastewater enters a vacuum evaporator to enable the concentration of ammonium sulfate in the wastewater to reach 25-35 percent, and then the wastewater is introduced into a crystallizer to enable the concentration of ammonium sulfate in the wastewater to reach 35-45 percent,
c. then the ammonium sulfate is put into a centrifuge to crystallize and separate from water to obtain the ammonium sulfate with the water content less than or equal to 5 percent;
③ drying of crystalline particles of activated carbon sludge, heavy metal sludge and ammonium sulfate
The method comprises the steps of enabling activated carbon sludge, heavy metal sludge and ammonium sulfate crystallized particles to enter a multilayer vibrating fluidized bed dryer, enabling heavy metal sludge to enter a first-level filter screen on the uppermost layer, activated carbon sludge to enter a second-level filter screen on the middle layer and ammonium sulfate to crystallize through a third-level filter screen on the lowermost layer, introducing waste hot gas into a sintering plant to heat, enabling the water content of dried ammonium sulfate, activated carbon powder and heavy metal to be less than or equal to 1%, and packaging the dried ammonium sulfate, activated carbon powder and heavy metal into finished products through a packaging.
The invention has the beneficial effects that:
① the invention can realize the separation of the active carbon, heavy metal and sulfur nitrogen in the acid wastewater by controlling the parameters, and the yield of each substance is more than 90%.
② the invention realizes the output of three products of active carbon, heavy metal and ammonium sulfate in acid wastewater, the active carbon powder is used as fuel substitute for blast furnace or sintering plant, the compound of iron, lead, arsenic and mercury can be used as chemical raw material for downstream enterprises with heavy metal demand, the ammonium sulfate is an agricultural fertilizer and can be sold directly as product.
③ the invention solves the disposal and resource problems of acid-making waste water, and realizes the win-win of environmental protection benefit and economic benefit.
④ the ammonia water, hydrogen peroxide or oxygen of the invention is cheap and easy to get, the cost of the preparation is low, and no new chemical elements are added to the system, so that the invention has no problem of secondary pollution.
⑤ the invention uses the iron and aluminum ions of the waste water to produce the flocculation effect, no extra flocculant is needed, and the separation effect is good without the use cost of medicament.
⑥ the invention has small land occupation and investment, and is easy to be implemented on site.
Drawings
FIG. 1 is a schematic diagram of a resource system for acid-making wastewater of a sintering flue gas activated carbon desulfurization process;
FIG. 2 is a schematic diagram of the construction of a multi-layer fluidized bed dryer;
in the figure, a first-stage reaction tank 1, an acid-making wastewater pipe 1.1, a second-stage reaction tank 2, a third-stage reaction tank 3, a preheater 4, a climbing film heater 5, a vacuum evaporator 6, a crystallizer 7, a centrifuge 8, a centrifugal return pipe 8.1, a second-stage sludge dewatering machine 9, a second-stage return pipe 9.1, a first-stage sludge dewatering machine 10, a first-stage return pipe 10.1, a multi-layer fluidized bed dryer 11, a first-stage filter sieve 11.1, a second-stage filter sieve 11.2, a third-stage filter sieve 11.3, a hot gas pipe 11.4, an ammonium sulfate outlet 11.5, an activated carbon powder outlet 11.6, a heavy metal outlet 11.7, an ammonia water pipe 12, an aeration pipe or a double.
Detailed Description
The present invention is described in further detail below with reference to specific examples so as to be understood by those skilled in the art.
Example 1
The acid production wastewater recycling system of the sintering flue gas activated carbon desulfurization process as shown in fig. 1-2 comprises a primary reaction tank 1, wherein the primary reaction tank 1 is sequentially connected with a secondary reaction tank 2, a tertiary reaction tank 3, a preheater 4, a climbing film heater 5, a vacuum evaporator 6, a crystallizer 7, a centrifuge 8 and a multilayer fluidized bed dryer 11 through a main pipeline, the primary reaction tank 1 is respectively connected with an ammonia water pipe 12 and an acid production wastewater pipe 1.1, the secondary reaction tank 2 is connected with an ammonia water pipe 12, the tertiary reaction tank 3 is connected with an aeration pipe or a double ammonia water pipe 13, and the primary reaction tank 1 is sequentially connected with a primary sludge dehydrator 10 and a multilayer fluidized bed dryer 11 through a primary branch pipe; the primary sludge dewatering machine 10 is communicated with the primary reaction tank 1 through a primary return pipe 10.1.
The secondary reaction tank 2 is sequentially connected with a secondary sludge dewatering machine 9 and a multilayer fluidized bed dryer 11 through a secondary branch pipe; the secondary sludge dewatering machine 9 is communicated with the secondary reaction tank 2 through a secondary return pipe 9.1;
the multilayer fluidized bed dryer 11 is internally provided with a primary filter sieve 11.1, a secondary filter sieve 11.2 and a tertiary filter sieve 11.3 from top to bottom respectively; the bottom of the multilayer fluidized bed dryer 11 is provided with a plurality of rows of hot air pipes 11.4; the primary filter sieve 11.1, the secondary filter sieve 11.2 and the tertiary filter sieve 11.3 are respectively communicated with the secondary sludge dewatering machine 9, the primary sludge dewatering machine 10 and the centrifugal machine 8, and the centrifugal machine 8 is communicated with the secondary reaction tank 2 through a centrifugal return pipe 8.1; the other ends of the first-stage filter sieve 11.1, the second-stage filter sieve 11.2 and the third-stage filter sieve 11.3 are sequentially and correspondingly provided with an ammonium sulfate outlet 11.5, an activated carbon powder outlet 11.6 and a heavy metal outlet 11.7.
The acid-making wastewater recycling system of the sintering flue gas activated carbon desulfurization process is utilized to recycle different acid-making wastewater:
example 2
A certain sintering flue gas active carbon desulfurization plant:
acid-making wastewater: pH was-1, acid content 4.08%, SO4 2-6328mg/L, 300mg/L ammonia nitrogen, 6486mg/L suspended matter, 130mg/L Fe, 0.8mg/L Pb, 0.5mg/L As, 0.2mg/L Ni, 0.4mg/L Hg, 0.1mg/L Cr.
The method for recycling acid-making wastewater from the acid-making wastewater of the sintering flue gas activated carbon desulfurization process comprises the following steps:
1) the acid-making wastewater is pretreated firstly,
a. introducing 15% ammonia water into the primary reaction tank 1, uniformly mixing the ammonia water and the acid-making wastewater by using a stirrer, detecting the pH value of the wastewater to 6.5, stopping stirring and adding the ammonia water, allowing the reaction tank to stand for 5min to precipitate suspended substance activated carbon powder in the wastewater, and allowing the wastewater to enter a primary sludge dehydrator 10 to dehydrate to obtain activated carbon sludge for later use;
b. introducing the supernatant into a secondary reaction tank 2, starting a stirrer, continuously introducing ammonia water with the concentration of 15% until the pH value is 8.5, stopping adding the ammonia water, standing and precipitating for 5min to precipitate metal ions in the wastewater, entering a secondary sludge dehydrator 9, and dehydrating to obtain heavy metal sludge for later use;
c. leading the supernatant to a third-stage reaction tank 3, adding 2.5g/L hydrogen peroxide or aerating, controlling the molar ratio of hydrogen peroxide to sulfite ions in the hydrogen peroxide to be 1.0-1.2: 1, oxidizing sulfite ions in the acid-making wastewater, reacting for 3min until the separation of suspended matters and heavy metals in the acid-making wastewater is completed, and leaving ammonium sulfate solution for later use;
② recycling the sulfur and nitrogen elements:
a. the obtained wastewater is sequentially introduced into a preheater 4 to increase the concentration of ammonium sulfate to 15 percent, enters a climbing film heater 5 to increase the concentration of ammonium sulfate to 25 percent,
b. then enters a vacuum evaporator 6 to lead the concentration of ammonium sulfate in the wastewater to reach 35 percent, and then is introduced into a crystallizer 7 to lead the concentration of ammonium sulfate in the wastewater to reach 45 percent,
c. then the ammonium sulfate is put into a centrifuge 8 to crystallize and separate from water to obtain the ammonium sulfate with the water content less than or equal to 5 percent;
③ drying of crystalline particles of activated carbon sludge, heavy metal sludge and ammonium sulfate
Activated carbon sludge, heavy metal sludge and ammonium sulfate crystallized particles enter a multilayer vibrating fluidized bed dryer, heavy metal sludge is fed into a first-level filter sieve 11.1 on the uppermost layer, activated carbon sludge is fed into a second-level filter sieve 11.2 on the middle layer, ammonium sulfate is fed into a third-level filter sieve 11.3 on the lowermost layer for crystallization, waste hot gas introduced into a sintering plant is heated, the water content of dried ammonium sulfate, activated carbon powder and heavy metal is less than or equal to 1%, and then the dried ammonium sulfate, activated carbon powder and heavy metal are packaged into finished products through a packaging machine respectively for sale.
Example 3
A certain sintering flue gas active carbon desulfurization plant:
acid-making wastewater: pH of-0.8, acid content of 4.92%, SO4 2-The content is 9328mg/L, the ammonia nitrogen content is 350mg/L, the suspended matter content is 7486mg/L, the Fe content is 150mg/L, the Pb content is 0.9mg/L, the As content is 0.4mg/L, the Ni content is 0.3mg/L, the Hg content is 0.3mg/L, and the Cr content is 0.1 mg/L.
The method for recycling acid-making wastewater from the acid-making wastewater of the sintering flue gas activated carbon desulfurization process comprises the following steps:
1) the acid-making wastewater is pretreated firstly,
a. introducing 12% ammonia water into the primary reaction tank 1, uniformly mixing the ammonia water and the acid-making wastewater by using a stirrer, detecting the pH value of the wastewater to 7, stopping stirring and adding the ammonia water, allowing the reaction tank to stand for 8min, precipitating suspended substance activated carbon powder in the wastewater, and allowing the wastewater to enter a primary sludge dehydrator 10 to dehydrate to obtain activated carbon sludge for later use;
b. introducing the supernatant into a secondary reaction tank 2, starting a stirrer, continuously introducing ammonia water with the concentration of 12% until the pH value is 9, stopping adding the ammonia water, standing and precipitating for 5min to precipitate metal ions in the wastewater, entering a secondary sludge dehydrator 9, and dehydrating to obtain heavy metal sludge for later use;
c. leading the supernatant to a third-stage reaction tank 3, adding 4.5g/L hydrogen peroxide or aerating, controlling the molar ratio of hydrogen peroxide to sulfite ions in the hydrogen peroxide to be 1.0-1.2: 1, oxidizing sulfite ions in the acid-making wastewater, reacting for 5min until the separation of suspended matters and heavy metals in the acid-making wastewater is completed, and leaving ammonium sulfate solution for later use;
② recycling the sulfur and nitrogen elements:
a. the obtained wastewater is sequentially introduced into a preheater 4 to increase the concentration of ammonium sulfate to 15 percent, enters a climbing film heater 5 to increase the concentration of ammonium sulfate to 24 percent,
b. then enters a vacuum evaporator 6 to ensure that the concentration of ammonium sulfate in the wastewater reaches 34 percent, and then is introduced into a crystallizer 7 to ensure that the concentration of ammonium sulfate in the wastewater reaches 44 percent,
c. then the ammonium sulfate is put into a centrifuge 8 to crystallize and separate from water to obtain the ammonium sulfate with the water content less than or equal to 5 percent;
③ drying of crystalline particles of activated carbon sludge, heavy metal sludge and ammonium sulfate
Activated carbon sludge, heavy metal sludge and ammonium sulfate crystallized particles enter a multilayer vibrating fluidized bed dryer, heavy metal sludge is fed into a first-level filter sieve 11.1 on the uppermost layer, activated carbon sludge is fed into a second-level filter sieve 11.2 on the middle layer, ammonium sulfate is fed into a third-level filter sieve 11.3 on the lowermost layer for crystallization, waste hot gas introduced into a sintering plant is heated, the water content of dried ammonium sulfate, activated carbon powder and heavy metal is less than or equal to 1%, and then the dried ammonium sulfate, activated carbon powder and heavy metal are packaged into finished products through a packaging machine respectively for sale.
Example 4
A certain sintering flue gas active carbon desulfurization plant:
the pH value of the acid-making wastewater is-0.5, the acid content is 3.91 percent, and the SO content is4 2-5120mg/L, 250mg/L ammonia nitrogen, 5316mg/L suspended matter, 120mg/L Fe, 0.7mg/L Pb, 0.2mg/L As, 0.1mg/L Ni, 0.1mg/L Hg and 0.1mg/L Cr.
The method for recycling acid-making wastewater from the acid-making wastewater of the sintering flue gas activated carbon desulfurization process comprises the following steps:
1) the acid-making wastewater is pretreated firstly,
a. introducing 13% ammonia water into the primary reaction tank 1, uniformly mixing the ammonia water and the acid-making wastewater by using a stirrer, detecting the pH value of the wastewater to 6.5, stopping stirring and adding the ammonia water, allowing the reaction tank to stand for 7min, precipitating suspended substance activated carbon powder in the wastewater, and allowing the precipitated activated carbon powder to enter a primary sludge dehydrator 10 to dehydrate to obtain activated carbon sludge for later use;
b. introducing the supernatant into a secondary reaction tank 2, starting a stirrer, continuously introducing ammonia water with the concentration of 13% until the pH value is 9, stopping adding the ammonia water, standing for precipitation for 4min to precipitate metal ions in the wastewater, entering a secondary sludge dehydrator 9, and dehydrating to obtain heavy metal sludge for later use;
c. leading the supernatant to a third-stage reaction tank 3, adding 2.9g/L hydrogen peroxide or aerating, controlling the molar ratio of hydrogen peroxide to sulfite ions in the hydrogen peroxide to be 1.0-1.2: 1, oxidizing sulfite ions in the acid-making wastewater, reacting for 4min until the separation of suspended matters and heavy metals in the acid-making wastewater is completed, and leaving ammonium sulfate solution for later use;
② recycling the sulfur and nitrogen elements:
a. the obtained waste water is sequentially introduced into a preheater 4 to increase the concentration of ammonium sulfate to 12 percent, enters a climbing film heater 5 to increase the concentration of ammonium sulfate to 20 percent,
b. then enters a vacuum evaporator 6 to ensure that the concentration of ammonium sulfate in the wastewater reaches 30 percent, and then is introduced into a crystallizer 7 to ensure that the concentration of ammonium sulfate in the wastewater reaches 40 percent,
c. then the ammonium sulfate is put into a centrifuge 8 to crystallize and separate from water to obtain the ammonium sulfate with the water content less than or equal to 5 percent;
③ drying of crystalline particles of activated carbon sludge, heavy metal sludge and ammonium sulfate
Activated carbon sludge, heavy metal sludge and ammonium sulfate crystallized particles enter a multilayer vibrating fluidized bed dryer, heavy metal sludge is fed into a first-level filter sieve 11.1 on the uppermost layer, activated carbon sludge is fed into a second-level filter sieve 11.2 on the middle layer, ammonium sulfate is fed into a third-level filter sieve 11.3 on the lowermost layer for crystallization, waste hot gas introduced into a sintering plant is heated, the water content of dried ammonium sulfate, activated carbon powder and heavy metal is less than or equal to 1%, and then the dried ammonium sulfate, activated carbon powder and heavy metal are packaged into finished products through a packaging machine respectively for sale.
Other parts not described in detail are prior art. Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.

Claims (5)

1. The utility model provides a sintering flue gas active carbon desulfurization technology system sour waste water resource system which characterized in that: the system comprises a first-stage reaction tank (1), wherein the first-stage reaction tank (1) is sequentially connected with a second-stage reaction tank (2), a third-stage reaction tank (3), a preheater (4), a climbing film heater (5), a vacuum evaporator (6), a crystallizer (7), a centrifuge (8) and a multilayer fluidized bed dryer (11) through a main pipeline, the first-stage reaction tank (1) is respectively connected with an ammonia water pipe (12) and an acid-making wastewater pipe (1.1), the second-stage reaction tank (2) is connected with an ammonia water pipe (12), the third-stage reaction tank (3) is connected with an aeration pipe or a double ammonia water pipe (13), and the first-stage reaction tank (1) is sequentially connected with a first-stage sludge dewatering machine (10) and a multilayer fluidized bed dryer (11) through a first-stage branch pipe; the secondary reaction tank (2) is sequentially connected with a secondary sludge dehydrator (9) and a multilayer fluidized bed dryer (11) through a secondary branch pipe; the multilayer fluidized bed dryer (11) is internally provided with a primary filter sieve (11.1), a secondary filter sieve (11.2) and a tertiary filter sieve (11.3) from top to bottom respectively; a plurality of rows of hot air pipes (11.4) are arranged at the bottom of the multilayer fluidized bed dryer (11);
the secondary sludge dewatering device is characterized in that the primary filter sieve (11.1), the secondary filter sieve (11.2) and the tertiary filter sieve (11.3) are respectively corresponding to the secondary sludge dewatering device (9), the primary sludge dewatering device (10) and the centrifugal machine (8), and the other ends of the primary filter sieve (11.1), the secondary filter sieve (11.2) and the tertiary filter sieve (11.3) are sequentially corresponding to an ammonium sulfate outlet (11.5), an activated carbon powder outlet (11.6) and a heavy metal outlet (11.7).
2. The acid-making wastewater recycling system for the sintering flue gas activated carbon desulfurization process according to claim 1, characterized in that: the primary sludge dewatering machine (10) is communicated with the primary reaction tank (1) through a primary return pipe (10.1).
3. The acid-making wastewater recycling system for the sintering flue gas activated carbon desulfurization process according to claim 1, characterized in that: the secondary sludge dewatering machine (9) is communicated with the secondary reaction tank (2) through a secondary return pipe (9.1).
4. The acid-making wastewater recycling system for the sintering flue gas activated carbon desulfurization process according to claim 1, characterized in that: the centrifuge (8) is communicated with the secondary reaction tank (2) through a centrifuge return pipe (8.1).
5. A resource method of acid-making wastewater by the device of claim 1, which is characterized by comprising the following steps:
1) the acid-making wastewater is pretreated firstly,
a. introducing 10-15% ammonia water into the primary reaction tank, uniformly mixing the ammonia water and the acid-making wastewater by using a stirrer, detecting the pH value of the wastewater to 5.5-7.5, stopping stirring and adding the ammonia water, allowing the reaction tank to stand and sink for 5-10min, precipitating suspended activated carbon powder in the wastewater, and allowing the wastewater to enter a primary sludge dehydrator to dehydrate to obtain activated carbon sludge for later use;
b. introducing the supernatant into a secondary reaction tank, starting a stirrer, continuously introducing ammonia water with the concentration of 10-15% until the pH value is 8.5-9.5, stopping adding the ammonia water, standing for precipitation for 3-8min to precipitate metal ions in the wastewater, introducing the wastewater into a secondary sludge dehydrator, and dehydrating to obtain heavy metal sludge for later use;
c. leading the supernatant to a three-stage reaction tank, adding hydrogen peroxide or aerating, controlling the molar ratio of hydrogen peroxide to sulfite ions in the hydrogen peroxide to be 1.0-1.2: 1, oxidizing sulfite ions in the acid-making wastewater, reacting for 3-5min until the separation of suspended matters and heavy metals is completed in the acid-making wastewater, and leaving an ammonium sulfate solution for later use;
② recycling the sulfur and nitrogen elements:
a. the obtained wastewater is sequentially introduced into a preheater to increase the concentration of ammonium sulfate to 10-15 percent, enters a climbing film heater to increase the concentration of ammonium sulfate to 15-25 percent,
b. then the wastewater enters a vacuum evaporator to enable the concentration of ammonium sulfate in the wastewater to reach 25-35 percent, and then the wastewater is introduced into a crystallizer to enable the concentration of ammonium sulfate in the wastewater to reach 35-45 percent,
c. then the ammonium sulfate is put into a centrifuge to crystallize and separate from water to obtain the ammonium sulfate with the water content less than or equal to 5 percent;
③ drying of crystalline particles of activated carbon sludge, heavy metal sludge and ammonium sulfate
The method comprises the steps of enabling activated carbon sludge, heavy metal sludge and ammonium sulfate crystallized particles to enter a multilayer vibrating fluidized bed dryer, enabling heavy metal sludge to enter a first-level filter screen on the uppermost layer, activated carbon sludge to enter a second-level filter screen on the middle layer and ammonium sulfate to crystallize through a third-level filter screen on the lowermost layer, introducing waste hot gas into a sintering plant to heat, enabling the water content of dried ammonium sulfate, activated carbon powder and heavy metal to be less than or equal to 1%, and packaging the dried ammonium sulfate, activated carbon powder and heavy metal into finished products through a packaging.
CN201911303622.0A 2019-12-17 2019-12-17 Acid-making wastewater recycling system and method by sintering flue gas activated carbon desulfurization process Pending CN110921958A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111762798A (en) * 2020-06-30 2020-10-13 宝钢湛江钢铁有限公司 Method for recovering ammonium sulfate in sintering acid-making waste liquid

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101597070A (en) * 2009-07-03 2009-12-09 中钢集团天澄环保科技股份有限公司 Sintering, pelletizing and stove purifying device of ammonium sulphate solution produced by flue gas desulfurization by ammonia process and method
CN105174588A (en) * 2015-10-19 2015-12-23 双良节能系统股份有限公司 Coking industry desulfurization waste water zero discharge treatment system
CN110127918A (en) * 2018-02-02 2019-08-16 中冶长天国际工程有限责任公司 A kind of acidic flue gas washes Zero discharge treatment method and its device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101597070A (en) * 2009-07-03 2009-12-09 中钢集团天澄环保科技股份有限公司 Sintering, pelletizing and stove purifying device of ammonium sulphate solution produced by flue gas desulfurization by ammonia process and method
CN105174588A (en) * 2015-10-19 2015-12-23 双良节能系统股份有限公司 Coking industry desulfurization waste water zero discharge treatment system
CN110127918A (en) * 2018-02-02 2019-08-16 中冶长天国际工程有限责任公司 A kind of acidic flue gas washes Zero discharge treatment method and its device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111762798A (en) * 2020-06-30 2020-10-13 宝钢湛江钢铁有限公司 Method for recovering ammonium sulfate in sintering acid-making waste liquid

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