CN113862467A - Novel process method for blast furnace co-processing hazardous waste hw18 - Google Patents
Novel process method for blast furnace co-processing hazardous waste hw18 Download PDFInfo
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- CN113862467A CN113862467A CN202110967200.4A CN202110967200A CN113862467A CN 113862467 A CN113862467 A CN 113862467A CN 202110967200 A CN202110967200 A CN 202110967200A CN 113862467 A CN113862467 A CN 113862467A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a novel process method for blast furnace co-processing hazardous waste hw18, which comprises the steps of firstly, pretreating incineration residue hw18, and screening or ball pressing the incineration residue hw18 for multiple times to enable the incineration residue to meet the use requirements. Then, mixing the hw18 meeting the requirements with the raw materials according to a certain proportion, and finally entering a blast furnace for smelting. The novel process method for the blast furnace to cooperatively treat the hazardous waste hw18 does not need to invest new equipment and change the original blast furnace ironmaking process, and has the advantages of thorough treatment, low treatment cost and simple process and operation.
Description
Technical Field
The invention relates to the field of chemical production, in particular to a novel process method for cooperatively treating hazardous waste hw18 by a blast furnace.
Background
The hw18 incineration disposal residue (772-.
Introduction of the prior disposal technology:
resource utilization: and (4) recycling valuable heavy metals in the incineration residue, such as acid extraction, alkali extraction, complexing agent extraction, biological extraction and the like. Typical process-sulfuric acid dissolution, filter pressing to remove mud, and oxidation reaction of filtrate to remove iron; after iron removal, the filtrate is heated, reduced and filter-pressed to extract chromium hydroxide, and the chromium slag is converted into chromium production workshop to produce basic chromium sulfate; extracting copper, zinc and nickel solution from the filtrate by an organic phase; and adding sulfuric acid to back extract pure nickel sulfate, zinc and copper, and crystallizing to obtain the product. The advantages are that: the treatment is thorough; the disadvantages are as follows: professional enterprises need to be built, the process is complex, the flow is long, and the equipment investment is huge; the requirement on useful elements is high, the proportion of the useful elements is low, and the economic benefit is poor; the disposal cost is high, and the economic benefit is unstable; the treatment of resource is less dangerous and waste, and the production efficiency of enterprises is unstable.
And (3) cement kiln co-treatment: the incineration residue is homogenized and pretreated, and enters a cement kiln for cooperative treatment according to a certain proportion. The advantages are that: the equipment investment is low and the disposal quantity is large. The disadvantages are as follows: the existing synergistic treatment amount is large, the influence on the cement kiln capacity is large, the comprehensive benefit of a cement enterprise is not favorably obtained, the benefit driving force is reduced, the existing basic saturation is realized, and the growth amount is not large; in addition, the requirement on the content of heavy metals is strict, and the proportion is strictly controlled; finally, heavy metals enter a concrete building to be diluted and cured, and can be leached into water and soil after a long time, so that the environment is influenced.
Curing and landfill disposal: and the incineration residue is solidified and then enters a special landfill for landfill. The advantages are that: all varieties hw18 sludge can be landfilled for curing. The disadvantages are as follows: the curing and landfill costs are high; a professional rigid landfill is needed, and the treatment in a common landfill cannot be realized; the sludge is actually kept, and the risk of environmental pollution caused by leaching after a long time is not eliminated; the professional rigid landfill site is few, the large amount of hw18 incineration residue is not filled in the landfill in a large capacity, and the disposal cost is high.
Carrying out vitrification treatment in a plasma furnace: and (4) entering a plasma furnace, and adding other ingredients at high temperature to form glass body solidification. The advantages are that: the curing is complete, and the variety of hw18 can be treated. The disadvantages are as follows: professional equipment needs to be invested, and the investment is huge; the plasma furnace has low power and low handling capacity; the disposal cost is high.
Other treatment processes comprise: the incineration residue is proportioned according to a certain proportion, and the final product is a vitrified foam heat-insulating product by utilizing the existing thermal kiln. The advantages are that: the solidification is complete, and the incineration residue hw18 can be treated. The disadvantages are as follows: professional equipment needs to be invested, and the investment is huge; the process is complex, and the disposal quantity is small; the disposal cost is high; the product yield is low, the output value is low, and the economic benefit of enterprises is poor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel process method for the blast furnace to cooperatively treat dangerous waste hw18 aiming at the defects of the prior art.
The invention realizes the purpose through the following technical scheme: a novel process method for the blast furnace co-processing of hazardous waste hw18 is disclosed, wherein: the method comprises the following steps:
(1) pretreatment: screening, dewatering and ball pressing the incineration residue hw 18;
(2) proportioning according to the proportion: mixing the pretreated incineration residue hw18 with raw materials, wherein the incineration residue hw18 accounts for 0.14% of the raw materials, and after the mixing is finished, performing moisture removal treatment on the hw18 and the raw materials again;
(3) blast furnace treatment: the pressed or pelletized hw18 is mixed with the raw materials and then enters a blast furnace for smelting.
As a further optimization scheme of the invention, the pretreatment of the step (1) comprises the following steps:
(1.1) primary screening: screening the incineration residue hw18 for the first time, and transporting the hw18 with the appearance and the components meeting the requirements to a pretreatment site in a closed manner;
(1.2) secondary screening: carrying out secondary screening on the hw18 meeting the requirements of the primary screening, and transporting the hw18 meeting the requirements of the secondary screening to a stacking area for draining and storing;
(1.3) three screens: the drained hw18 is transported to the top of a large bunker by an electric single-beam crane, screening is carried out by a grid at the top of the large bunker and a vibrating screen at the discharge outlet of the large bunker, and screened oversize materials I are used as blast furnace materials; weighing the undersize product I and the auxiliary materials according to batch proportioning;
(1.4) pressing balls: weighing the undersize product I and the auxiliary materials according to batch proportioning, stirring and feeding into a ball pressing device to prepare an oval ball shape;
(1.5) four screenings: screening the oval incineration residues hw18 by using a screen, and taking oversize products II as blast furnace materials; and stirring and pressing the second sieved material again.
Further optimizing the scheme, the step (1.3) is carried out three times of screening, and the method comprises the following steps:
(1.31) rinsing: and after the incineration residues hw18 are transported to a pretreatment site in a closed manner, the site where the incineration residues hw18 are stacked is washed, and sewage enters a sewage collection system.
As a further optimization scheme of the invention, the temperature of blast furnace smelting is 2200-2400 ℃.
As a further optimization of the invention, the moisture content of the incineration residue hw18 in the pretreatment is lower than 30%.
According to a further optimization scheme, the auxiliary material is CaO, and the auxiliary material accounts for 20% of the first undersize product.
In a further optimized scheme, the pretreatment also comprises bag-type dust removal.
In the step (1.4), electromagnetic iron removal is further included before the first undersize material and the auxiliary materials are weighed according to batch proportioning calculation.
Compared with the prior art, the invention has the following beneficial effects:
the hw18 incineration residue mainly contains inorganic compounds such as SiO2, AL2O3, CaO, FeO and the like and a small amount of heavy metals, is consistent with blast furnace ironmaking and slagging materials, meets the basic requirements of a blast furnace on ironmaking raw materials, namely ironmaking and slagging raw materials, can be pretreated and briquetted and then added into the blast furnace raw materials according to a certain proportion, and meets the requirements of ironmaking and slagging. And by utilizing the existing equipment of the existing iron and steel enterprises, a small amount of equipment investment is needed except for pretreatment briquetting, the cooperative disposal system does not need equipment investment, the treatment process technology and the operation requirement are simple, the energy is fully utilized, and the hw18 is disposed in place.
The iron element enters molten iron and is recycled; part of heavy metals are reduced into molten iron to become trace elements, so that the resource utilization is realized, and the improvement of the variety of the molten iron is facilitated; part of heavy metal enters blast furnace slag and is vitrified and solidified to be used as building materials such as cement, brick making and the like; the tail gas enters the existing environmental treatment equipment. The method has the advantages that the characteristic of large material use amount of the iron and steel enterprises is fully exerted, the treatment amount is large, the treatment time is along with the existing blast furnace iron-making process, the existing process of the iron and steel enterprises is not changed, and the treatment time is short.
Drawings
FIG. 1 is a schematic flow chart of a new process for the blast furnace co-processing of hazardous waste hw 18;
FIG. 2 is a schematic flow chart of the pretreatment step in the new process for blast furnace co-processing hazardous waste hw 18;
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
Examples
The new process method for the blast furnace to cooperatively treat the hazardous waste hw18 has no additional equipment in the process flow of the blast furnace, and the pretreatment is additionally provided with partial equipment for blocking or pressing balls. And (3) smelting the incineration residue hw18 blocks or balls serving as raw materials in a blast furnace.
As shown in figure 1, a new process method for the blast furnace to cooperatively dispose hazardous waste hw18 comprises the following steps:
(1) pretreatment: screening the incineration residue hw18, removing water, and pressing into balls. Wherein, the pretreatment of the step (1) comprises the following steps, as shown in fig. 2.
(1.1) primary screening: and (4) screening the incineration residue hw18 for the first time, and transporting the hw18 with the appearance and the components meeting the requirements to a pretreatment site in a closed manner.
(1.2) secondary screening: and carrying out secondary screening on the hw18 meeting the requirements of the primary screening, and transporting the hw18 meeting the requirements of the secondary screening to a stacking area for draining and storing. Because the moisture has a great influence on the hw18, when the hw18 is processed, the water is drained, and the moisture is ensured to be lower than 30%.
(1.3) three screens: the drained hw18 is transported to the top of a large bunker by an electric single-beam crane, screening is carried out by a grid at the top of the large bunker and a vibrating screen at the discharge outlet of the large bunker, and screened oversize materials I are used as blast furnace materials; and weighing the first undersize product and the auxiliary materials according to batch proportioning.
(1.31) rinsing: and after the incineration residues hw18 are transported to a pretreatment site in a closed manner, the site where the incineration residues hw18 are stacked is washed, and sewage enters a sewage collection system.
(1.4) pressing balls: weighing the undersize product I and the auxiliary materials according to batch proportioning, stirring and feeding into a ball pressing device to prepare an oval ball shape;
(1.5) four screenings: screening the oval incineration residues hw18 by using a screen, and taking oversize products II as blast furnace materials; and stirring and pressing the second sieved material again.
(2) Proportioning according to the proportion: mixing the pretreated incineration residue hw18 with raw materials, wherein the incineration residue hw18 accounts for 0.14% of the raw materials, and after the mixing is finished, performing moisture removal treatment on the hw18 and the raw materials again;
(3) blast furnace treatment: the pressed or pelletized hw18 is mixed with the raw materials and then enters a blast furnace for smelting.
To sum up, the flow of the preprocessing step includes: firstly, the incineration residue hw18 is subjected to appearance and component analysis, and the composition and moisture analysis is carried out in batches after the incineration residue hw18 enters the site, so that the moisture content of the incineration residue is ensured to be lower than 30%, and the incineration residue hw18 is transported to a pretreatment site according with requirements. The electric hoist is unloaded to the raw material stacking area according with the requirement. The raw materials are stored for 2-3 days in a stacking area, after the moisture is basically drained, the raw materials are lifted to a large storage bin through an electric hoist, a 100 mm-100 mm grid is arranged at the top of the large storage bin, a vibrating screen is arranged at the bottom of the large storage bin, after the materials pass through the vibrating screen, oversize products and oversize products at the top of the large storage bin are stacked together and transported to a blast furnace together with finished products for disposal and utilization, undersize products and auxiliary materials are weighed according to batch proportioning, enter a conveying belt (an electromagnetic iron remover is reserved in the area of the belt), and are conveyed to a stirrer through a belt conveyor to be uniformly stirred, wherein the auxiliary materials are CaO, and the auxiliary materials account for 20% of the undersize products I or undersize products II. And after uniformly stirring, the materials enter a ball pressing device and are pressed into elliptical balls with the diameter of 50mm 36mm 25.5mm, oversize materials are stacked in a finished product area, undersize materials return to a stirring machine and then are conveyed to a belt conveyor, and the elliptical balls continue to enter a ball pressing system. The pretreatment system is also provided with a cloth bag for dust removal and catching on-site dust.
The throttling process of the incineration residue hw18 entering the blast furnace steelmaking ring comprises the following steps: the incineration residue hw18 is pretreated, pressed into blocks or balls and used as a blast furnace raw material, enters a lower main adhesive tape of a blast furnace groove through a movable belt, then enters a feeding main adhesive tape, and finally enters a blast furnace. After the smelting in the blast furnace, part of heavy metal enters molten iron to be used as trace elements, and part of heavy metal enters furnace slag. In the embodiment, the hw18 accounts for 0.14 percent of the whole ore consumption ratio, the occupancy ratio is extremely small, and the fluctuation of the total (Fe) component is about 0.06 percent, thereby meeting the requirement of the blast furnace charging on the fluctuation of the raw materials. The product water slag, dry slag, slag flushing water, coal gas dedusting ash, dust under the groove and the like reach the danger removal and harmless requirements of hw18 after the test of the product. The high temperature (2100 ℃ -2300 ℃) in the blast furnace smelting process is utilized to carry out harmless treatment on the incineration bottom slag, and the requirement of the synergistic treatment of the hw18 entering the blast furnace is met.
Description of the ingredients
The blast furnace in this example has an effective volume of 2500m3, an original design capacity of 400 ten thousand t/a, and an actual output of 460 ten thousand t/a. The furnace body is a thin lining structure integrating a short and fat type furnace body and a brick wall, a combined soft water closed circulating system, a double-rectangular iron tapping field, 3 tapholes, 30 air ports and three internal combustion type hot blast furnaces and one top combustion type hot blast furnace are adopted. The basic charge structure is: 80% of sintered coke, 20% of lump ore, 60% of factory dry quenching coke and 40% of outsourcing coke.
12800d/t of daily molten iron, 21000d/t of consumed ore, 2500t/d of consumed coke and 900t/d of consumed coal powder.
In this embodiment, the blast furnace capacity, energy consumption, heavy metals of slag, heavy metals of water, and heavy metals of fly ash are monitored, and the data are as follows:
conditions of the furnace
Slag flushing water
Dry slag and granulated slag in front of furnace
Gas ash
Dust removal ash under groove
Environmental monitoring (6.15 and 6.22)
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (8)
1. A novel process method for the blast furnace co-processing of hazardous waste hw18 is characterized in that: the method comprises the following steps:
(1) pretreatment: screening, dewatering and ball pressing the incineration residue hw 18;
(2) proportioning according to the proportion: mixing the pretreated incineration residue hw18 with raw materials, wherein the incineration residue hw18 accounts for 0.14% of the raw materials, and after the mixing is finished, performing moisture removal treatment on the hw18 and the raw materials again;
(3) blast furnace treatment: the pressed or pelletized hw18 is mixed with the raw materials and then enters a blast furnace for smelting.
2. The new process method for blast furnace co-processing hazardous waste hw18 as claimed in claim 1, wherein the new process method comprises the following steps: the pretreatment in the step (1) comprises the following steps:
(1.1) primary screening: screening the incineration residue hw18 for the first time, and transporting the hw18 with the appearance and the components meeting the requirements to a pretreatment site in a closed manner;
(1.2) secondary screening: carrying out secondary screening on the hw18 meeting the requirements of the primary screening, and transporting the hw18 meeting the requirements of the secondary screening to a stacking area for draining and storing;
(1.3) three screens: the drained hw18 is transported to the top of a large bunker by an electric single-beam crane, screening is carried out by a grid at the top of the large bunker and a vibrating screen at the discharge outlet of the large bunker, and screened oversize materials I are used as blast furnace materials; weighing the undersize product I and the auxiliary materials according to batch proportioning;
(1.4) pressing balls: weighing the undersize product I and the auxiliary materials according to batch proportioning, stirring and feeding into a ball pressing device to prepare an oval ball shape;
(1.5) four screenings: screening the oval incineration residues hw18 by using a screen, and taking oversize products II as blast furnace materials; and stirring and pressing the second sieved material again.
3. The new process method for blast furnace co-processing hazardous waste hw18, according to claim 2, characterized in that: and (3) carrying out screening for three times, wherein the screening comprises the following steps:
(1.31) rinsing: and after the incineration residues hw18 are transported to a pretreatment site in a closed manner, the site where the incineration residues hw18 are stacked is washed, and sewage enters a sewage collection system.
4. The new process method for blast furnace co-processing hazardous waste hw18 as claimed in claim 1, wherein the new process method comprises the following steps: the temperature of blast furnace smelting is 2200-2400 ℃.
5. The new process method for blast furnace co-processing hazardous waste hw18, according to claim 2, characterized in that: in the pretreatment, the moisture content of the incineration residue hw18 is lower than 30%.
6. The new process method for blast furnace co-processing hazardous waste hw18, according to claim 2, characterized in that: the auxiliary material is CaO, and the auxiliary material accounts for 20% of the first undersize product.
7. The new process method for blast furnace co-processing hazardous waste hw18 as claimed in claim 1, wherein the new process method comprises the following steps: the pretreatment also comprises bag dedusting.
8. The new process method for blast furnace co-processing hazardous waste hw18, according to claim 2, characterized in that: in the step (1.4), electromagnetic iron removal is further included before the first undersize material and the auxiliary materials are weighed according to batch proportioning calculation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110967200.4A CN113862467A (en) | 2021-08-23 | 2021-08-23 | Novel process method for blast furnace co-processing hazardous waste hw18 |
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| CN202110967200.4A CN113862467A (en) | 2021-08-23 | 2021-08-23 | Novel process method for blast furnace co-processing hazardous waste hw18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114891942A (en) * | 2022-06-02 | 2022-08-12 | 蔡玉春 | System and method for utilizing hazardous waste containing heavy metals through blast furnace cooperative treatment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107363072A (en) * | 2017-06-30 | 2017-11-21 | 中国恩菲工程技术有限公司 | The fused bath smelting method of waste |
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- 2021-08-23 CN CN202110967200.4A patent/CN113862467A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107363072A (en) * | 2017-06-30 | 2017-11-21 | 中国恩菲工程技术有限公司 | The fused bath smelting method of waste |
Non-Patent Citations (1)
| Title |
|---|
| 王彩云等: "《钢铁炉窑协同处置危险废物类别的适宜性探讨》", 《工业安全与环保》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114891942A (en) * | 2022-06-02 | 2022-08-12 | 蔡玉春 | System and method for utilizing hazardous waste containing heavy metals through blast furnace cooperative treatment |
| CN114891942B (en) * | 2022-06-02 | 2023-12-05 | 蔡玉春 | Method for cooperatively disposing and utilizing hazardous waste containing heavy metals by blast furnace |
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Application publication date: 20211231 |