CN115716710A - Method for on-line harmless treatment of chromium-containing sludge by using thermal-state blast furnace slag - Google Patents
Method for on-line harmless treatment of chromium-containing sludge by using thermal-state blast furnace slag Download PDFInfo
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- CN115716710A CN115716710A CN202110980281.1A CN202110980281A CN115716710A CN 115716710 A CN115716710 A CN 115716710A CN 202110980281 A CN202110980281 A CN 202110980281A CN 115716710 A CN115716710 A CN 115716710A
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- furnace slag
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- 239000010802 sludge Substances 0.000 title claims abstract description 81
- 239000011651 chromium Substances 0.000 title claims abstract description 79
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 69
- 239000002893 slag Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 27
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 20
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011593 sulfur Substances 0.000 claims abstract description 19
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003546 flue gas Substances 0.000 claims abstract description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 14
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 239000011521 glass Substances 0.000 claims description 30
- 239000008187 granular material Substances 0.000 claims description 21
- 238000005469 granulation Methods 0.000 claims description 12
- 230000003179 granulation Effects 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 8
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 239000006060 molten glass Substances 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000010791 quenching Methods 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 235000010265 sodium sulphite Nutrition 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007908 dry granulation Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 239000008188 pellet Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 230000002829 reductive effect Effects 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000004017 vitrification Methods 0.000 abstract description 8
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 6
- 239000002910 solid waste Substances 0.000 abstract description 6
- 238000002844 melting Methods 0.000 abstract description 5
- 230000008018 melting Effects 0.000 abstract description 5
- 238000000354 decomposition reaction Methods 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 4
- 238000003756 stirring Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000007670 refining Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000002386 leaching Methods 0.000 description 5
- 231100000419 toxicity Toxicity 0.000 description 5
- 230000001988 toxicity Effects 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 4
- 239000002920 hazardous waste Substances 0.000 description 4
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000011194 food seasoning agent Nutrition 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002366 mineral element Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The method for on-line harmless treatment of chromium-containing sludge by utilizing hot blast furnace slag comprises the steps of mixing the chromium-containing sludge with a thermal refining material, then mixing the chromium-containing sludge with the hot blast furnace slag for cooperative vitrification, and melting harmful heavy metal elements Cr in the chromium-containing sludge into the blast furnace slag in a harmless low-valence state, so that the harmless vitrification and low-cost vitrification of the chromium-containing sludge are realized. In the preparation process, the chromium-containing sludge is mixed with the quenched and tempered materials, so that the decomposition temperature of sulfate in the chromium-containing sludge and the melting temperature of the batch are reduced, then the batch is directly put on the surface of hot blast furnace slag flowing in a slag runner, the sensible heat of the hot blast furnace slag is utilized, the sulfate component in the chromium-containing sludge can be thoroughly decomposed, and then the batch can be melted without an external heating source and stirring, so that the energy consumption is reduced, and the production cost is reduced; the sulfur-containing flue gas is collected to prepare the sulfuric acid, so that the atmospheric pollution caused by the diffusion of sulfur element is avoided, the resource value of the chromium-containing sludge is fully utilized, and the dangerous solid waste emission in the related production process is obviously reduced.
Description
Technical Field
The invention belongs to the technical field of industrial hazardous solid waste treatment, and particularly relates to a method for carrying out online harmless treatment on chromium-containing sludge by utilizing hot blast furnace slag.
Background
The chromium-containing sludge is solid dangerous waste produced in the industries of steel, nonferrous metal, leather tanning and the like. For example, after being treated, wastewater from chromate passivation treatment process of cold rolling production units in iron and steel enterprises can generate a large amount of chromium-containing sludge, and the chromium-containing sludge contains carcinogenic substances such as heavy metal Cr with high content and high activity, so that the chromium-containing sludge is included in a range of hazardous wastes, which accounts for about 60% of hazardous wastes in steel plants. The water content of the chromium-containing sludge is generally 50-60% after being pressed and filtered into cakes, and the Cr content is 0.5-20%. In addition, the cold rolling chromium-containing sludge has large fluctuation of components, and also contains a small amount of elements such as S, zn, pt, F and the like, so that the cold rolling chromium-containing sludge cannot be recycled in steel production, and the cold rolling chromium-containing sludge becomes a burden for steel enterprises. At present, chromium-containing sludge of enterprises of iron and steel, nonferrous metal, leather tanning and the like is generally treated by outsourcing, and the treatment cost is high. The reasonable consumption of the chromium-containing sludge is a technical problem to be solved urgently in the zero emission of the solid waste of related enterprises.
The technologies related to the treatment of the chromium-containing sludge are more, such as landfill after stable solidification, chromium extraction by a leaching method, doping of the chromium-containing sludge as raw materials of cement, ceramics and the like in a small proportion, and the like, and all the technologies have the problems of high treatment cost, incomplete treatment, large flue gas treatment capacity, secondary heavy metal pollution risk and the like.
The high-temperature melting and vitrification of the chromium-containing sludge is an effective way for realizing the harmless treatment of the chromium-containing sludge. After the sludge is vitrified, cr element is Cr 2 O 3 The form enters a glass network structure and is in a relatively stable state, and the leaching toxicity is obviously reduced. However, the vitrification of the chromium-containing sludge has the problems that Cr element is easy to oxidize in a treatment process and has a high valence state harmful to the environment, secondary pollution is caused by S diffusion, energy consumption is high, treatment cost is high and the like. In addition, the large fluctuation of the sludge components is not beneficial to subsequent resource utilization.
Blast furnace slag is another byproduct in the steel production process, and is formed by non-volatile components in metallurgical auxiliary materials such as gangue in iron ore, ash in fuel, limestone and the like in the blast furnace ironmaking process. When the iron-making blast furnace slag is discharged from the blast furnace, the temperature is more than 1400 ℃, and the sensible heat of 1 ton of blast furnace slag is approximately equivalent to the heat of 57 kg of standard coal. At present, the hot blast furnace slag at home and abroad is mainly treated by a water quenching process such as a Yinba method and the like to generate the granulated slag, and the blast furnace granulated slag is mainly in a glass state. If the thermal-state slag is taken as a base material, the chromium-containing sludge is cooperatively treated by utilizing the mineral elements and sensible heat resources of the blast furnace slag, and the sludge toxicity is eliminated, the dangerous solid waste discharge of the iron and steel enterprises can be obviously reduced, and the method has great significance for protecting the ecological environment and improving the economic benefit of the iron and steel enterprises.
Disclosure of Invention
The invention aims to provide a method for performing online harmless treatment on chromium-containing sludge by using thermal-state blast furnace slag, which fully utilizes sensible heat of the thermal-state blast furnace slag, and performs synergistic treatment on the chromium-containing sludge and the blast furnace slag under the condition of no need of an external heating source and stirring to realize harmless and low-cost vitrification of the chromium-containing sludge, and the prepared glass granules have stable components, high strength and low leaching toxicity, and have good economic value and popularization and application prospects; and the sulfate component in the chromium-containing sludge is thoroughly decomposed and used for preparing sulfuric acid or sodium sulfite, so that the resource value of the chromium-containing sludge is fully utilized, the discharge of dangerous solid wastes in related production processes is obviously reduced, and the treatment cost of the dangerous wastes is reduced.
In order to achieve the above purpose, the technical scheme of the invention is that,
a method for on-line innocent treatment of chromium-containing sludge by utilizing thermal-state blast furnace slag comprises the following steps:
1) Pretreatment of chromium-containing sludge
Drying and scattering the chromium-containing sludge into sludge powder;
2) Batch preparation
Uniformly mixing the sludge powder and the quenched and tempered material to obtain a batch mixture; the weight ratio of the sludge powder to the hardening and tempering material is 1.1-10;
the seasoning material comprises the following components in percentage by weight: siO 2 2 ：5-50％、Al 2 O 3 ：0.5-30％、CaO：0.1-10％、MgO：0-3％、B 2 O 3 ：0-2％、Na 2 O：0.1-20％、K 2 O：0.1-6％、P 2 O 5 ：0-0.9％、Fe 2 O 3 ：0.1-10％、C：1-90％；
3) Distributing and decomposing
When the blast furnace is used for deslagging, the batch is uniformly distributed on the surface of hot blast furnace slag flowing in the slag runner, so that sulfate in the batch sludge powder is rapidly decomposed and escapes from sulfur-containing flue gas, and then the batch is melted into the blast furnace slag to form molten glass; wherein the weight ratio of the batch to the blast furnace slag is controlled to be 1:8-100; collecting sulfur-containing flue gas in the treatment process;
4) Granulation
Granulating the glass liquid into glass granules, and recovering waste heat in the granulating process and the glass granules;
5) Cooling, packaging and warehousing.
Preferably, in the step 1), the drying temperature is 110 to 180 ℃.
The glass pellets produced according to the invention have a crush value of <7%.
Preferably, in step 4), the granulation is dry granulation or water granulation.
Preferably, in the step 3), a slag runner heat-insulating cover is arranged on the slag runner.
Preferably, the sulfur-containing flue gas collected in the treatment process of step 3) is prepared into sulfuric acid or sodium sulfite.
Preferably, in step 4), the residual heat in the granulation process and the glass granules is recovered.
In the method, the chromium-containing sludge and the quenched and tempered materials are mixed to form a batch, then the batch is distributed on the surface of blast furnace slag, a reducing agent in the batch preferentially reacts with oxygen in the environment to ensure that the atmosphere on the surfaces of the blast furnace slag and the batch is reductive, so that harmful heavy metal Cr in the chromium-containing sludge is kept in a harmless low valence state and is kept in the batch, sensible heat contained in thermal-state blast furnace slag is fully utilized, molten glass is formed in the flowing process of the thermal-state blast furnace slag and the batch in a slag runner, the molten glass is granulated into glass particles, and the heavy metal Cr in the chromium-containing sludge is Cr in the low valence state 2 O 3 The form is fused into a granular glass network, the chromium element is stably solidified, and the glass granules have no leaching toxicity, thereby realizing the low-cost harmless treatment of the chromium-containing sludge.
In the harmless treatment process of the chromium-containing sludge, na is added into the conditioning material 2 O、K 2 O、B 2 O 3 The low melting point of the above-mentioned materials is combined with fluxing agent and carbon reducing agent, so that the decomposition temperature of sulfate in the chromium-containing sludge can be reduced, and the sulfate can be decomposed and desulfurized at 1000-1300 deg.C. Therefore, the batch is distributed on the surface of the blast furnace slag, and the sensible heat of the hot blast furnace slag is fully utilized under the condition of not needing an external heat source and stirring, so that the sulfate component in the chromium-containing sludge can be rapidly and completely decomposed and escaped.
In addition, the reducing agent C in the conditioning material is preferentially related to the O in the environment 2 The reaction is carried out to generate CO, and the CO can promote the decomposition of sulfate in the chromium-containing sludge, so that the sulfate component in the chromium-containing sludge is thoroughly decomposed. The escaped sulfur-containing gas is discharged in a flue gas form, and the sulfur-containing flue gas can be used for preparing sulfuric acid, so that the sulfur-containing flue gas is reasonably applied, the atmospheric pollution caused by the diffusion of sulfur element is avoided, the resource value of chromium-containing sludge is fully utilized, the dangerous solid waste discharge in the related production process is obviously reduced, and the dangerous waste disposal cost is reduced.
Particularly, when the batch is distributed on the surface of blast furnace slag, uniform thin-layer distribution is realized, the batch distribution speed can be dynamically adjusted according to the flow of the blast furnace slag, and the weight ratio of the batch to the liquid blast furnace slag is controlled to be 1:8-100. The upper side of the slag runner is provided with a heat preservation cover, so that the temperature of the upper space of the slag runner is kept at 1250-1350 ℃, the temperature drop of slag and mixture is reduced, the surface weak reducing atmosphere of slag can be kept, the Cr element is kept in a low valence state, and the collection of sulfur-containing flue gas is facilitated.
The crushing value of the glass granules prepared by the method is less than 7%, the mechanical strength is high, the components are stable, the total chromium content and the hexavalent chromium content of the leachate of the glass granules prepared according to the HJ/T299 standard are lower than the national hazardous waste standard, the use is safe, the glass granules can be used as road building base materials, concrete aggregates, cementing materials and the like, and the glass granules have good economic value and popularization and application prospects.
The invention has the beneficial effects that:
1. the method comprises the steps of performing synergistic vitrification on chromium-containing sludge and blast furnace slag, fully utilizing sensible heat and silicate mineral elements contained in the blast furnace slag, mixing the chromium-containing sludge and the blast furnace slag to form molten glass, and then granulating to obtain glass granules, so that the components and the performance of the glass granules are stable, and the harmless treatment of the chromium-containing sludge is realized.
2. The invention mixes the chromium-containing sludge and the conditioned material to prepare the batch, and Na is added into the conditioned material 2 O、K 2 O、B 2 O 3 The low-melting-point combined fluxing agent reduces the melting temperature of the batch, directly distributes the batch on the surface of the hot blast furnace slag flowing in the slag channel, fully utilizes the sensible heat contained in the blast furnace slag, avoids the heat loss of the blast furnace slag in the transfer process, enables the batch to be melted without an external heating source and stirring, reduces the energy consumption and further reduces the production cost.
3. The addition of the carbon reducing agent in the quenching and tempering material reduces the decomposition temperature of sulfate in the chromium-containing sludge, the sensible heat of blast furnace slag can be utilized to thoroughly decompose the sulfate component in the chromium-containing sludge, the formed sulfur-containing flue gas can be used for preparing sulfuric acid, the sulfur element is reasonably applied, the atmospheric pollution caused by the diffusion of the sulfur element is avoided, the resource value of the chromium-containing sludge is fully utilized, and the dangerous solid waste emission in the related production process is obviously reduced.
4. The granules prepared by the method have high vitrification degree, heavy metal element Cr in the sludge is fused into a granule glass network in a low valence state, the total chromium content and the hexavalent chromium content of the glass granule leachate prepared according to the HJ/T299 standard are lower than the national hazardous waste standard, the product has no leaching toxicity, and the harmless treatment of the chromium-containing sludge is thoroughly realized.
5. The glass granules prepared by the method have the crushing value of less than 7 percent, stable components and high mechanical strength, can be used as road building base materials, concrete aggregates, cementing materials and the like, and have good economic value and popularization and application prospects.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples and figures.
Referring to fig. 1, the method for the online harmless treatment of the chromium-containing sludge by using the thermal state blast furnace slag comprises the following steps:
1) Pretreatment of chromium-containing sludge
Drying and scattering the chromium-containing sludge into sludge powder;
2) Batch preparation
Uniformly mixing the sludge powder and the quenched and tempered material to obtain a batch mixture; the weight ratio of the sludge powder to the hardening and tempering material is 1.1-10;
the seasoning material comprises the following components in percentage by weight: siO 2 2 ：5-50％、Al 2 O 3 ：0.5-30％、CaO：0.1-10％、MgO：0-3％、B 2 O 3 ：0-2％、Na 2 O：0.1-20％、K 2 O：0.1-6％、P 2 O 5 ：0-0.9％、Fe 2 O 3 ：0.1-10％、C：1-90％；
3) Distributing and decomposing
When the blast furnace is used for deslagging, uniformly distributing the batch to the surface of thermal-state blast furnace slag flowing in the slag runner, so that sulfate in the batch sludge powder is rapidly decomposed and escapes from sulfur-containing flue gas, and then the batch is melted into the blast furnace slag to form molten glass; regulating and controlling the material distribution speed of the batch according to the flow rate of the hot blast furnace slag to control the weight ratio of the batch to the blast furnace slag to be 1:8-100; collecting sulfur-containing flue gas in the treatment process;
4) Granulation
Granulating the glass liquid to prepare glass granules;
5) And cooling, packaging and warehousing.
Preferably, in the step 1), the drying temperature is 110 to 180 ℃.
Preferably, in step 4), the granulation is dry granulation or water granulation.
Preferably, in the step 3), a slag runner heat-insulating cover is arranged on the slag runner.
Preferably, the sulfur-containing flue gas collected in the treatment process of step 3) is prepared into sulfuric acid or sodium sulfite.
Preferably, in step 4), the residual heat in the granulation process and the glass granules is recovered.
The ingredients of the quenching and tempering materials in the embodiment of the invention are shown in the table 1; the process parameters of the embodiment of the invention are shown in Table 2; the results of the property tests of the glass pellets prepared in the examples of the present invention are shown in Table 3.
The crushing value of the glass granules prepared by the embodiment of the invention is less than 7%, the total chromium content of the leachate prepared according to the HJ/T299 standard is less than 0.1mg/L, and the hexavalent chromium content is less than 0.05mg/L, so that the glass granules can be used as road building base materials, concrete aggregates and the like, and have good economic value and popularization and application prospects.
Claims (7)
1. A method for carrying out on-line harmless treatment on chromium-containing sludge by utilizing thermal-state blast furnace slag is characterized by comprising the following steps:
1) Pretreatment of chromium-containing sludge
Drying and scattering the chromium-containing sludge into sludge powder;
2) Batch preparation
Uniformly mixing the sludge powder and the quenched and tempered material to obtain a batch mixture; the weight ratio of the sludge powder to the hardening and tempering material is 1.1-10;
the conditioning material comprises the following components in percentage by weight: siO 2 2 ：5-50％、Al 2 O 3 ：0.5-30％、CaO：0.1-10％、MgO：0-3％、B 2 O 3 ：0-2％、Na 2 O：0.1-20％、K 2 O：0.1-6％、P 2 O 5 ：0-0.9％、Fe 2 O 3 ：0.1-10％、C：1-90％；
3) Distributing and decomposing
When the blast furnace is used for deslagging, the batch is uniformly distributed on the surface of hot blast furnace slag flowing in the slag runner, so that sulfate in the batch sludge powder is rapidly decomposed and escapes from sulfur-containing flue gas, and then the batch is melted into the blast furnace slag to form molten glass; wherein the weight ratio of the batch to the blast furnace slag is controlled to be 1:8-100; collecting sulfur-containing flue gas in the treatment process;
4) Granulation
Granulating the glass liquid to prepare glass granules;
5) And cooling, packaging and warehousing.
2. The method for the on-line innocent treatment of the chromium-containing sludge by utilizing the hot blast furnace slag as claimed in claim 1, wherein in the step 1), the drying temperature is 110-180 ℃.
3. The method for the on-line innocent treatment of chromium-containing sludge by using hot blast furnace slag according to claim 1, wherein in the step 4), the granulation is dry granulation or water quenching granulation.
4. The method of claim 1, wherein the glass pellets produced in step 4) have a crush value of <7%.
5. The method for the on-line harmless treatment of the chromium-containing sludge by utilizing the hot blast furnace slag according to claim 1, wherein in the step 3), a slag runner heat preservation cover is arranged on the slag runner.
6. The method for the on-line harmless treatment of the chromium-containing sludge by using the hot blast furnace slag according to claim 1, wherein the sulfur-containing flue gas collected in the treatment process of the step 3) is prepared into sulfuric acid or sodium sulfite.
7. The method for the on-line harmless treatment of the chromium-containing sludge by the hot blast furnace slag according to claim 1, wherein in the step 4), the residual heat in the granulation process and the glass granules is recovered.
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