CN102093042A - Resource industrial symbiosis treatment method for hot-rolled iron scale - Google Patents
Resource industrial symbiosis treatment method for hot-rolled iron scale Download PDFInfo
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- CN102093042A CN102093042A CN 201010561480 CN201010561480A CN102093042A CN 102093042 A CN102093042 A CN 102093042A CN 201010561480 CN201010561480 CN 201010561480 CN 201010561480 A CN201010561480 A CN 201010561480A CN 102093042 A CN102093042 A CN 102093042A
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- iron scale
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- ferrite
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Abstract
The invention relates to a resource industrial symbiosis treatment method for hot-rolled iron scale. The method comprises treatment of oxide scale and comprehensive utilization of waste coal gas resources and production wastewater. In the method, a permanent ferrite pre-sintered material is produced from iron scale, a part of the permanent ferrite pre-sintered material is used for producing a permanent ferrite magnetic component, and the remaining permanent ferrite pre-sintered material is exported; coal gas produced by a coke furnace, a blast furnace and a converter is collected and taken as a fuel of pre-burning and sintering, and residual coal gas is converted into electric power supplied to a system through cyclic cogeneration, so that energy consumption is lowered; and the production wastewater is collected, treated and taken as process cleaning and cooling water, so that water consumption is lowered. By implementing the scheme, good economic benefit and environmental benefit can be brought to an enterprise.
Description
Technical field
The present invention relates to a kind of useless method for processing resource, particularly a kind of hot rolling iron scale industrial symbiosis processing method for recycling.
Background technology
Produce a large amount of ferric oxide secondary resources (various dedusting ash, hot rolling iron scale, spent pickle liquor, cold rolling red iron oxide, steel rolling greasy filth etc.) that contain in the steel manufacture process.To the utilization of ferric oxide secondary resource, iron and steel enterprise concentrated on attention in the past it was returned on the process for producing steel and iron line.In fact these valuable ferric oxide secondary resources can be used for producing high value-added product, as magneticsubstance of available hot rolling iron scale and cold rolling red iron oxide production high added value etc.Iron scale is that Steel Mill's rolled piece in the operation of rolling is met the oxides-containing iron that water sharply cools off back steel surface generation, to produce 1000 ten thousand tons of iron and steel enterprises per year is example, annual about 90,000 tons of the iron scale that hot-rolled process produces, iron scale accounts for 3%～5% of the steel of handling, its
w(Fe), be the highest waste residue of iron level in the various iron slags of iron and steel enterprise up to 80%～90%.Therefore carry out that the research of iron scale resource utilization is increased economic efficiency to steel production enterprise and environmental benefit has great importance.Iron scale is high quality raw material of producing permanent magnet material, utilizes iron scale to produce the high value added product permanent magnet material, is the important channel of improving steel enterprise economic benefit and environmental benefit.
Current, control mainly is that research reduces iron scale countermeasure that forms and the method for removing the hot-rolled steel scale on surface to hot rolling iron scale, or it is returned on the process for producing steel and iron line, and it is less that the development and use iron scale is produced high value added product research.Do like this, the subject matter of existence has: steel smelting procedure still has a large amount of iron scales to produce, and bulk deposition not only occupies valuable land resources, also can cause certain harm to environment; Do not pay attention to the iron scale resource utilization is produced high value added product, caused the serious waste of resource.Reduced economic benefit of enterprises.
Summary of the invention
The object of the present invention is to provide a kind of hot rolling iron scale industrial symbiosis processing method for recycling.
For achieving the above object, the present invention adopts following technical proposals:
A kind of hot rolling iron scale industrial symbiosis processing method for recycling comprises the comprehensive utilization of utilization, waste coal gas resource and the factory effluent of hot rolling iron scale, it is characterized in that these method concrete steps are as follows:
A kind of hot rolling iron scale industrial symbiosis processing method for recycling comprises the comprehensive utilization of utilization, waste coal gas resource and the factory effluent of hot rolling iron scale, it is characterized in that these method concrete steps are as follows:
A. the concrete grammar of the utilization of described hot rolling iron scale is:
A-1. hot rolling iron scale is finely ground to the powder of particle diameter less than 5 μ m;
A-2. the powder that step a-1 is obtained, lime carbonate, Strontium carbonate powder, additive kaolin and spray water xi form the 8-10mm pelletizing in rotary course; Wherein the quality percentage composition of each composition is:
The powder 82.4% that step a-1 obtains, lime carbonate 15.4%,
Strontium carbonate powder 1.14%, additive kaolin 1.06%),
The spray water xi surplus;
A-3. with step a-2 gained pelletizing preliminary sintering about 1300 ℃, obtain permanent ferrite prefiring material;
A-4. the permanent ferrite prefiring material that obtains among the step a-2 is used to prepare permanent-magnet ferrite magnetic spare;
B. waste coal gas comprehensive utilization: the surplus gas that utilizes steel manufacture process to produce turns back to recycle in the soft magnetic ferrite production as the energy of producing;
C. the comprehensive utilization of waste water: the waste water that production process is produced returns recycle in the soft magnetic ferrite production after treatment.
The concrete steps that the above-mentioned permanent ferrite prefiring material with among the step a-4 is used to prepare permanent-magnet ferrite magnetic spare are: permanent magnetism pre-burning pellet abrasive dust is broken, and obtaining particle diameter is the coarse sand of 4 μ m ~ 7 μ m; With this meal, add water after fine grinding below 1 μ m, be pressed into blank more as required with definite shape, size and weight, require blank intensity 66 ~ 70Am2kg
-1, density 4.2g/cm
3About, the blank that suppresses is carried out solid state reaction under 1200 ℃ ~ 1300 ℃ temperature, promptly obtain permanent-magnet ferrite magnetic spare.
The present invention and existing hot rolling iron scale control ratio have following conspicuous substantive distinguishing features and advantage: the hot rolling iron scale industrial symbiosis processing method for recycling is developed the high value added product permanent magnet material from the degree of depth and the range of by product utilization; The present invention fully utilizes waste coal gas and provides the energy for system, has reduced energy consumption; The recycle factory effluent has been saved water.By the enforcement of this programme, can bring favorable economic benefit and environmental benefit for enterprise.
Description of drawings
Fig. 1 is the industrial symbiosis pattern of hot rolling iron scale resource utilization;
Fig. 2 is the materials flow chart of this industrial symbiosis pattern.
Concrete implementing method
The present invention is an example to produce 1000 ten thousand t steel production enterprise per year, and will produce the iron scale of about 4.5 ten thousand t every year.These iron scales all are used to produce permanent magnet material, can produce permanent ferrite prefiring material 50,000 t/a(wherein 2.6 ten thousand t/a sell, 2.4 ten thousand t/a produce permanent-magnet ferrite magnetic spare), permanent-magnet ferrite magnetic spare 20,000 t/a.
The raw material of permanent ferrite prefiring material is respectively iron scale (accounting for raw material 82.4%), Strontium carbonate powder (accounting for raw material 15.4%), lime carbonate (accounting for raw material 1.14%) and additive (accounting for raw material 1.06%).Iron scale is from the hot rolling by product, and Strontium carbonate powder, lime carbonate and additive kaolin are outsourcing.
Permanent ferrite prefiring material directly as the raw material of producing permanent-magnet ferrite magnetic spare, does not need to add other raw materials again.
Implementing method is referring to Fig. 1 and Fig. 2.
The first step: ball milling.Collect hot rolling iron scale and carry out ball-milling processing, iron scale is finely ground to fine powder, particle diameter reaches 5 μ m;
Second step: mix.With iron scale (accounting for raw material 82.4%), Strontium carbonate powder (accounting for raw material 15.4%), lime carbonate (accounting for raw material 1.14%) and additive kaolin (accounting for raw material 1.06%) weighing by a certain percentage, and carry out thorough mixing.
The 3rd step: make ball.The starting material that mix are added spray water xi, in rotary course, form the 8-10mm pelletizing;
The 4th step: pre-burning.To drop into rotary kiln preliminary sintering about 1300 ℃ through the pelletizing of making behind the ball, obtain permanent ferrite prefiring material;
The 5th step: adopt the 4th pre-imitation frosted glass of permanent magnetism that obtain of step as raw material, can produce permanent magnet with definite shape, size, electrical property by operations such as ball mill pulverizing, sand milling, moulding, sintering, mill processing, go-on-gos.Ball mill pulverizing is that permanent magnetism pre-burning pellet abrasive dust is broken, makes its particle diameter about 5 μ m; Sand milling is with the meal after the ball mill pulverizing, add water after fine grinding below 1 μ m; Moulding be pressed into the slip of press after sand milling have definite shape, the blank of size and weight, require blank to have certain intensity and density; Sintering is that the blank that will suppress carries out solid state reaction at a certain temperature; Mill processing is to make permanent magnet have the product size and the electrical property of customer demand; Go-on-go is the sorting before the product after the mill processing is dispatched from the factory, and the undesirable product of outward appearance, size or performance is eliminated out in sorting according to customer requirements, comprises in case of necessity by the survey product performance or by volume production product size.
The 6th step: collect waste coal gas (coke-oven gas, blast furnace gas, coal gas of converter) and provide fuel for operations such as the pre-burning of rolling iron oxide leather permanent magnet material, sintering.Part more than needed provides electric power by the mixed gas combined cycle generation for system.Concrete grammar is with reference to heat ice sister-in-law's " renewable resources of Iron And Steel Industry coal gas " and Gao Yongfen " utilizing the Study on Engineering Design of waste coal gas generating ";
The 7th step: collect factory effluent and return the production cycle utilization after treatment.
Economic benefit: the present invention utilizes the rolling iron oxide red-face role to produce the high value added product permanent magnet material, and fully utilizing the smelting iron and steel waste coal gas simultaneously is that enterprise cuts down the consumption of energy, and factory effluent returns production cycle after treatment and utilizes water saving.To produce 1000 ten thousand t steel production enterprise per year is example, and will produce the iron scale of about 4.5 ten thousand t every year.These ferric oxide micromicros produce permanent ferrite prefiring material 50,000 t/a(wherein 2.6 ten thousand t/a sell, 2.4 ten thousand t/a produce permanent-magnet ferrite magnetic spare), permanent-magnet ferrite magnetic spare 20,000 t/a.By the enforcement of scheme, not only saved the cost of a part of resource consumption, also the high value added product that can produce can bring favorable economic benefit for enterprise.
Claims (2)
1. a hot rolling iron scale industrial symbiosis processing method for recycling comprises the comprehensive utilization of utilization, waste coal gas resource and the factory effluent of hot rolling iron scale, it is characterized in that these method concrete steps are as follows:
A. the concrete grammar of the utilization of described hot rolling iron scale is:
A-1. hot rolling iron scale is finely ground to the powder of particle diameter less than 5 μ m;
A-2. the powder that step a-1 is obtained, lime carbonate, Strontium carbonate powder, additive kaolin and spray water xi form the 8-10mm pelletizing in rotary course; Wherein the quality percentage composition of each composition is:
The powder 82.4% that step a-1 obtains, lime carbonate 15.4%,
Strontium carbonate powder 1.14%, additive kaolin 1.06%),
The spray water xi surplus;
A-3. with step a-2 gained pelletizing preliminary sintering about 1300 ℃, obtain permanent ferrite prefiring material;
A-4. the permanent ferrite prefiring material that obtains among the step a-2 is used to prepare permanent-magnet ferrite magnetic spare;
B. waste coal gas comprehensive utilization: the surplus gas that utilizes steel manufacture process to produce turns back to recycle in the soft magnetic ferrite production as the energy of producing;
C. the comprehensive utilization of waste water: the waste water that production process is produced returns recycle in the soft magnetic ferrite production after treatment.
2. hot rolling iron scale industrial symbiosis processing method for recycling according to claim 1, it is characterized in that the described concrete steps that permanent ferrite prefiring material among the step a-4 is used to prepare permanent-magnet ferrite magnetic spare are: permanent magnetism pre-burning pellet abrasive dust is broken, and obtaining particle diameter is the coarse sand of 4 μ m ~ 7 μ m; With this meal, add water after fine grinding below 1 μ m, be pressed into blank more as required with definite shape, size and weight, require blank intensity 66 ~ 70Am2kg
-1, density 4.2g/cm
3About, the blank that suppresses is carried out solid state reaction under 1200 ℃ ~ 1300 ℃ temperature, promptly obtain permanent-magnet ferrite magnetic spare.
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| CN 201010561480 CN102093042A (en) | 2010-11-28 | 2010-11-28 | Resource industrial symbiosis treatment method for hot-rolled iron scale |
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| CN 201010561480 CN102093042A (en) | 2010-11-28 | 2010-11-28 | Resource industrial symbiosis treatment method for hot-rolled iron scale |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104987055A (en) * | 2015-07-06 | 2015-10-21 | 河北钢铁股份有限公司邯郸分公司 | Method for producing ferrite pre-sintering material through steelmaking dry dedusting fine ash |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3897355A (en) * | 1973-04-26 | 1975-07-29 | Gen Electric | Method of making permanent ferrite magnets |
| CN101860091A (en) * | 2010-04-26 | 2010-10-13 | 马鞍山市鑫洋永磁有限责任公司 | Preparation method for rare earth permanent ferrite magnetic shoe and product |
| CN101870456A (en) * | 2010-06-12 | 2010-10-27 | 上海大学 | Industrial symbiosis processing method for recycling cold rolled waste acid |
-
2010
- 2010-11-28 CN CN 201010561480 patent/CN102093042A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3897355A (en) * | 1973-04-26 | 1975-07-29 | Gen Electric | Method of making permanent ferrite magnets |
| CN101860091A (en) * | 2010-04-26 | 2010-10-13 | 马鞍山市鑫洋永磁有限责任公司 | Preparation method for rare earth permanent ferrite magnetic shoe and product |
| CN101870456A (en) * | 2010-06-12 | 2010-10-27 | 上海大学 | Industrial symbiosis processing method for recycling cold rolled waste acid |
Non-Patent Citations (1)
| Title |
|---|
| 《三峡环境与生态》 20090930 邓德敏等 轧钢铁鳞资源化利用技术及铁鳞脱油新思路 第34-35和第40页 1-2 第2卷, 第5期 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104987055A (en) * | 2015-07-06 | 2015-10-21 | 河北钢铁股份有限公司邯郸分公司 | Method for producing ferrite pre-sintering material through steelmaking dry dedusting fine ash |
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Application publication date: 20110615 |