CN104419821A - Method for producing sintered ore by using waste acid mud - Google Patents
Method for producing sintered ore by using waste acid mud Download PDFInfo
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- CN104419821A CN104419821A CN201310398285.4A CN201310398285A CN104419821A CN 104419821 A CN104419821 A CN 104419821A CN 201310398285 A CN201310398285 A CN 201310398285A CN 104419821 A CN104419821 A CN 104419821A
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- China
- Prior art keywords
- mud
- acid mud
- spent acid
- hydrochloric acid
- waste acid
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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
- C22B1/02—Roasting processes
-
- 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
- C22B1/16—Sintering; Agglomerating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for producing sintered ore by using waste acid mud. The method comprises the following steps: roasting waste acid mud at a low temperature for 3-4 hours in a rotary kiln by using waste gas of 200-300 DEG C in an iron and steel plant, and removing water and free hydrochloric acid in the waste acid mud to form hydrochloric acid steam and obtain iron-rich slag; crushing the roasted dry waste acid mud into mud particles with a particle diameter being smaller than 8mm by a crusher, introducing the waste acid mud particles into a sintering system, preparing materials by taking the crushed dry waste acid mud as an iron material, wherein the mass percentage of the dry waste acid mud is 3%-8% of the sintered iron material; mixing, dewatering, digesting, sintering and producing high-quality sintered ore; and extracting the hydrochloric acid steam to a spraying tower (6) by an air extracting fan (7), spraying and recycling a hydrochloric acid liquid. The metallurgical property of the sintered ore is improved.
Description
Technical field
The present invention relates to Using Metallurgical Solid Wastes renewable resources and utilize field, the renewable resources being specifically related to a kind of spent acid mud utilizes field.
Background technology
All there is the spent acid mud emission problem that Shandong this nanofarad regeneration hydrochloric acid unit produces in current domestic cold rolling mill production line, annual every about 10,000 tons, the bar line of quantity discharged.Due to one of the most unmanageable industrial hazard waste residue that spent acid mud complicated component is generally acknowledged.Up to the present, domestic each steel mill all adopts the mode process of simple landfill.Because land resources is fewer and feweri, the place that can be used for landfill is about to the needs that can not meet the process of spent acid mud, and this problem will become the bottleneck hindering cold rolling mill Sustainable development.Therefore, the comprehensive utilization reducing spent acid mud quantity discharged and spent acid mud is current and one of for some time iron and steel enterprise problem in the urgent need to address from now on.
Spent acid mud be the spent pickle liquor of cold rolling mill through flocculation sediment, then extrude gained pie product by extrusion machine.Spent acid mud main component is iron(ic) chloride and ironic hydroxide, and other component contents are less, also containing a certain amount of remaining hydrochloric acid.Hydrochloric acid evaporates from spent acid mud, irritant smell, poisonous.Existence due to hydrochloric acid causes spent acid mud to be difficult to be used effectively.
At present, domestic steel mill all takes the mode process spent acid mud of common landfill, by adding new water and rainwater to dilute remaining hydrochloric acid.Due to the boiling characteristics of hydrochloric acid, very large pollution is there is in the method to environment, the hydrochloric acid volatilized on the one hand has a great impact the crowd around landfill yard is healthy, also pollution can be formed to the environment of surrounding, soil after landfill will be in acid state for a long time, can not growing plant, and the landfill disposal cycle is also longer on the other hand, the new soil causing needs a large amount of is to process more spent acid mud, and this is not the road of a Sustainable development.
Therefore, how to realize the harmless treatment of spent acid mud, shorten the treatment cycle of spent acid mud, reduce the intractability of spent acid mud, become the key of spent acid mud comprehensive utilization.
Patent " CN01112521.7 ", relate generally to one iron mud and sulfuric acid, by roasting after the mixing of certain proportion, the technology and equipment research of production red iron oxide, wherein a large amount of uses of sulfuric acid cause, cost increase very high to the requirement of equipment, also can there is certain danger to producers in production, be not suitable for applying.
Patent " CN200910198271.1 " relates generally to the method for a kind of pyroprocessing containing sour mud, need by after drying sludge, high pressure compacting balling-up, 1 hour is no less than again through the high temperature heating time of more than 1000 DEG C, the serious waste energy, and the acid vapour produced under high temperature is not effectively processed, easily produce pollution.
Patent " CN200810023918.2 " relates generally to a kind of method of drying and incinerating joint processing system lignin-sludge, this system complex, and roasting under the high temperature of temperature 800 DEG C, may blast be produced.
Patent " CN201010547143.6 " relates generally to a kind of method of comprehensive utilization of chlor-alkali salt sludge, and filtered through seven times by chlor-alkali salt sludge, by middle filter cake 350 DEG C of calcinings, removing chloride ion, operation is long, energy consumption is high, and will introduce a large amount of alkali.
Summary of the invention
The object of the invention is to overcome prior art above shortcomings, be provided for soft bake spent acid mud, reclaim remaining hydrochloric acid, by the solid residue after curing for the production of agglomerate, spent acid mud is carried out to the application art of harmless treatment.The present invention cures spent acid mud in airtight device, and utilize spray column to absorb HCl in steam, solid residue is used for sintering, thus reach innoxious comprehensive utilization to spent acid mud, reduce production cost, economize on resources, the object of protection of the environment.
The technical program is used for the method that will be used for sintering after spent acid mud low-temperature bake.
A kind of method utilizing spent acid mud to produce agglomerate, it is characterized in that comprising the steps: that (1) low-temperature bake reclaims rich iron residue: in rotary kiln, utilize temperature in Steel Plant to be that the waste gas of 200 ~ 300 DEG C carries out low-temperature bake 3 ~ 4 hours to spent acid mud, deviate from the moisture in spent acid mud and free hydrochloric acid, form hydrochloric acid vapour, obtain rich iron residue;
(2) sintering utilize rich iron residue: the dry spent acid mud after roasting through crusher in crushing to being less than 8 ㎜, enter sintering system, dry spent acid mud after fragmentation is prepared burden as a kind of iron charge, dry spent acid mud accounts for the mass percent 3% ~ 8% of sintering iron charge, through batch mixing, sintering, produce high quality agglomerate; Recycle in sintering after finally realizing spent acid mud low-temperature bake;
(3) absorb hydrochloric acid vapour and reclaim hydrochloric acid: the hydrochloric acid vapour of spent acid mud after rotary kiln baking is evacuated in spray column by vacuum fan, reclaim hydrochloric acid solution through spray, hydrochloric acid solution is stored in acid storage tank.
The concentration of hydrochloric acid is detected by pH meter, when hydrochloric acid is more than or equal to mass percent 10%, by HCl recovery, if concentration of hydrochloric acid does not reach mass percent 10%, then continue to enter spray column and absorb hydrochloric acid, so both can ensure that the concentration reclaiming hydrochloric acid also can save new water to greatest extent; The hydrochloric acid that the concentration reclaimed reaches mass percent 10% returns and recycles in steel rolling pickling system.
Spent acid mud harmless treatment process of the present invention, generally acknowledge the most unmanageable spent acid mud by Steel Plant, utilize industrial gaseous waste low temperature (200 ~ 300 DEG C) roasting after 3 ~ 4 hours, the spent acid mud after roasting is no longer containing hydrochloric acid, main component is ferric oxide, containing abundant recycling iron resources.For sintering system, reclaim iron resources, and improve the metallurgical performance of agglomerate.Save the land resources for landfill.
In today of cost sustainable growth, certain profit can be brought for enterprise.Waste hydrochloric acid concentration after absorption can reach mass percent 10%; can reuse in cold rolling mill; save the use of a part of eo-acid, and improve environment, achieve the innoxious comprehensive utilization to spent acid mud, reduce production cost, economize on resources, protection of the environment.
Accompanying drawing explanation
Fig. 1 the present invention utilizes spent acid mud to produce the process flow sheet of agglomerate;
Wherein, 1 is rotary kiln, and 2 is spent acid mud, and 3 is smoke discharging pipes, and 4 is dry spent acid mud, and 5 is crushers, and 6 is spray columns, and 7 is vacuum fans, and 8 is chimneys.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
Temperature in Steel Plant is utilized to be that the waste gas of 200 ~ 300 DEG C carries out low-temperature bake, spent acid mud 2 is carried out to the low-temperature bake of 3 ~ 4 hours in rotary kiln 1, the dry spent acid mud 4 after roasting, through jaw crusher 5, is crushed to after being less than 8mm, carry out agglutinating test, dry spent acid mud 4, as a part for iron charge, presses 0% of iron charge mass percent, 3% respectively, 5%, 8% batching, through batch mixing, fetches water, digests, sinters, produce agglomerate.
The hydrochloric acid vapour deviate from roasting process and water vapor, form negative pressure by vacuum fan 7 in pipeline, and steam enters spray column 6 by the road, absorbs hydrochloric acid vapour and reclaim hydrochloric acid vapour, then enter air through chimney 8.
Benchmark: spent acid mud proportioning 0%, sintered material weight 50kg, sinter basicity controls 2.0, Target moisture 7.2%.
Embodiment 1
Spent acid mud proportioning mass percent 3%, sintered material weight 50kg, sinter basicity controls 2.0, Target moisture 7.2%.Spent acid mud was 200 DEG C of roastings 3 hours.
Embodiment 2
Spent acid mud proportioning mass percent 5%, sintered material weight 50kg, sinter basicity controls 2.0, Target moisture 7.2%.Spent acid mud was 250 DEG C of roastings 4 hours.
Embodiment 3
Spent acid mud proportioning mass percent 8%, sintered material weight 50kg, sinter basicity controls 2.0, Target moisture 7.2%.Spent acid mud was 300 DEG C of roastings 3 hours.
Each embodiment test effect table
Reference test in table, does not add spent acid mud, and embodiment 1,2 and 3 is respectively with addition of mass percent 3%, 5% and 8% spent acid mud.From test-results, the index more than examined, all results adding spent acid mud is all better than and does not add spent acid mud, therefore can reach a conclusion, in agglomerate, add spent acid mud be in proportion conducive to improving sinter strength, and can certain iron resources and waste hydrochloric acid be reclaimed.
Claims (2)
1. utilize spent acid mud to produce a method for agglomerate, it is characterized in that comprising the steps:
A, low-temperature bake reclaim rich iron residue: in rotary kiln (1), utilize temperature in Steel Plant to be that the waste gas of 200 ~ 300 DEG C carries out low-temperature bake 3 ~ 4 hours to spent acid mud (2), deviate from the moisture in spent acid mud (2) and free hydrochloric acid, form hydrochloric acid vapour, obtain rich iron residue;
B, sintering utilize rich iron residue: the dry spent acid mud (4) after roasting is crushed to through crusher (5) and is less than 8 ㎜, enter sintering system, dry spent acid mud (4) after fragmentation is prepared burden as a kind of iron charge, dry spent acid mud (4) accounts for the mass percent 3% ~ 8% of sintering iron charge, through batch mixing, sintering, produce high quality agglomerate.
2. a kind of method utilizing spent acid mud to produce agglomerate according to claim 1, is characterized in that the hydrochloric acid vapour of spent acid mud after rotary kiln (1) roasting is evacuated in spray column (6) by vacuum fan (7), reclaims hydrochloric acid solution through spray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310398285.4A CN104419821A (en) | 2013-09-05 | 2013-09-05 | Method for producing sintered ore by using waste acid mud |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310398285.4A CN104419821A (en) | 2013-09-05 | 2013-09-05 | Method for producing sintered ore by using waste acid mud |
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| Publication Number | Publication Date |
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| CN104419821A true CN104419821A (en) | 2015-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310398285.4A Pending CN104419821A (en) | 2013-09-05 | 2013-09-05 | Method for producing sintered ore by using waste acid mud |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113816571A (en) * | 2020-06-19 | 2021-12-21 | 宝山钢铁股份有限公司 | Treatment method of cold rolling acid regeneration desilication sludge |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1171372A (en) * | 1966-12-27 | 1969-11-19 | Ruthner Ind Planungs Ag | Methods of Treating Solid Roasting Products |
| CN1160084A (en) * | 1996-03-18 | 1997-09-24 | 安阳钢铁集团有限责任公司 | Method for making quicklime iron concentrate briquette agglomerate |
| CN1970800A (en) * | 2005-11-24 | 2007-05-30 | 鞍钢集团鞍山矿业公司 | Sintering ore-proportioning method for different kinds of iron charge composed mostly of fine hematite concentrate |
| WO2008052232A1 (en) * | 2006-10-31 | 2008-05-08 | Gerhard Frithum | Iron oxide sintering process for spray roast oxide with exhaust gas recirculation |
| CN101307456A (en) * | 2007-04-25 | 2008-11-19 | 黄健 | Pickling waste acid regeneration process |
| CN101367085A (en) * | 2008-05-20 | 2009-02-18 | 马鞍山钢铁股份有限公司 | Acid washing iron red desilication filter cake treating device and treating method |
| CN102951782A (en) * | 2011-08-19 | 2013-03-06 | 鞍钢股份有限公司 | Method for absorbing residual hydrochloric acid in waste acid mud |
-
2013
- 2013-09-05 CN CN201310398285.4A patent/CN104419821A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1171372A (en) * | 1966-12-27 | 1969-11-19 | Ruthner Ind Planungs Ag | Methods of Treating Solid Roasting Products |
| CN1160084A (en) * | 1996-03-18 | 1997-09-24 | 安阳钢铁集团有限责任公司 | Method for making quicklime iron concentrate briquette agglomerate |
| CN1970800A (en) * | 2005-11-24 | 2007-05-30 | 鞍钢集团鞍山矿业公司 | Sintering ore-proportioning method for different kinds of iron charge composed mostly of fine hematite concentrate |
| WO2008052232A1 (en) * | 2006-10-31 | 2008-05-08 | Gerhard Frithum | Iron oxide sintering process for spray roast oxide with exhaust gas recirculation |
| CN101307456A (en) * | 2007-04-25 | 2008-11-19 | 黄健 | Pickling waste acid regeneration process |
| CN101367085A (en) * | 2008-05-20 | 2009-02-18 | 马鞍山钢铁股份有限公司 | Acid washing iron red desilication filter cake treating device and treating method |
| CN102951782A (en) * | 2011-08-19 | 2013-03-06 | 鞍钢股份有限公司 | Method for absorbing residual hydrochloric acid in waste acid mud |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113816571A (en) * | 2020-06-19 | 2021-12-21 | 宝山钢铁股份有限公司 | Treatment method of cold rolling acid regeneration desilication sludge |
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Application publication date: 20150318 |