CN1185054C - Process for recovering and reutilizing sulfuric acid dregs waste material - Google Patents
Process for recovering and reutilizing sulfuric acid dregs waste material Download PDFInfo
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- CN1185054C CN1185054C CNB021358397A CN02135839A CN1185054C CN 1185054 C CN1185054 C CN 1185054C CN B021358397 A CNB021358397 A CN B021358397A CN 02135839 A CN02135839 A CN 02135839A CN 1185054 C CN1185054 C CN 1185054C
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- sulfate slag
- adhesive
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- waste recovery
- sulfuric acid
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Abstract
The present invention provides a novel technique for recycling the waste material of sulfuric acid dregs for the technical field of ironmaking. The present invention is characterized in that the present invention adopts an agglomeration procedure by cold-consolidation molding in the technological process after the flotation, the reselection or the magnetic separation of the sulfuric acid dregs; an adhesive, a curing agent and an additive agent are added in the sulfuric acid dregs for the agglomeration by molding according to a given proportion, and the mixture is uniformly and thoroughly mixed in a stirrer; then, the mixture is pressed into agglomerations in a punch or a pressing machine with opposite rollers, and finished products with various shapes, such as spheres, ellipsoids, etc., are pressed; finally, the strength property of the cooled agglomerations achieves optimal in a natural placing method or an artificial maintenance method, and the agglomerations can be used for metallurgy production. Compared with the prior art, the sulfuric acid dregs can be recycled effectively with the adoption of the technique, and the present invention has the advantages of simple devices, convenient manufacture, short technological process, less investment of the devices, energy saving, no pollution, etc.
Description
Technical field:
The invention belongs to the technical field of smelting of iron, is that a kind of sulfate slag waste recovery that is used for Iron industry is utilized new technology.
Background technology:
Chemical industry is being produced with pyrite in the process of sulfuric acid, finally can produce a large amount of sulfate slag waste materials.These waste materials are owing to lack effectively, the feasible method of utilizing again, and except that a small part was reused as the filler of the batching of ironmaking and construction material, the overwhelming majority was abandoned as waste material.These discarded objects not only take gully, arable land in a large number, but also cause the face that pollutes very widely.Because long-term accumulation, these sulfate slags have become the problem of environmental pollution that people more and more pay attention to the pollution of environment.
Contain a large amount of iron in the sulfate slag, if can rationally utilize this part iron-containing resource, make them can become raw material and be used for steel and iron industry, so just can accomplish turns waste into wealth, and has also solved problem of environmental pollution simultaneously to a certain extent.
As iron-smelting raw material, at first require to have higher iron grade, iron-holder is generally more than 55%, even more than 60%, and next requires material forming is the pelletizing with a certain size and hot and cold intensity, guarantees not pulverize in ironmaking processes, do not break.Also require simultaneously to contain the least possible sulphur and P elements in the raw material, in order to avoid influence the quality of iron and steel.
It is because the particle of (1) sulfate slag is thinner that the sulfate slag waste material can not be directly used in iron-smelting raw material, can not must make the pelletizing with certain intensity and just can go into stove directly into stove.(2) the iron grade of sulfate slag is lower, and general iron-holder must improve the grade of sulfate slag through ore dressing below 50%.(3) also have some not have the sulphur of completing combustion in the sulfate slag, its content must reduce the sulfur content in the sulfate slag generally more than 1% before the ironmaking.Therefore, before being used to smelt iron, sulfate slag must make it meet the iron-smelting raw material requirement and just can be used for Iron industry through certain processing procedure.
Existing processing method may further comprise the steps: (1) flotation, gravity treatment or magnetic separation, purpose are the ferrous grades that improves sulfate slag, reduce the sulfur content of sulfate slag.(2) adopt the mode of sintering that sulfate slag is mixed in the iron ore concentrate, add adhesive, mixing sinters the agglomerates of sintered pellets with certain intensity at last after disk is made ball.Or sulfate slag mixed in the iron ore concentrate, use organic bond, roasting is solidified and is made it to form pelletizing under cryogenic conditions.Consume a large amount of heats when the shortcoming of this method is to prepare agglomerates of sintered pellets, can produce a large amount of air pollutions during sintering simultaneously, and powerful thermal current also can blow away tiny sulfate slag particle during sintering, causes unnecessary waste and a large amount of dust pollutions.And the calorific intensity of the made pelletizing of the technology that adopts low-temperature setting does not reach requirement, can influence the ordinary production of ironmaking enterprise.Therefore, adopt a large amount of recyclings of the method incompatibility sulfate slag waste material of this sintering or low-temperature setting.
Summary of the invention:
The purpose of this invention is to provide a kind of cold concretion technology mold pressing agglomeration of when handling the sulfate slag waste material, adopting, without sintering and low-temperature bake, have that equipment is simple, easy to make, technological process is short, energy-conservation and free of contamination sulfate slag waste recovery is utilized new technology.
Realize that the technical scheme that purpose of the present invention is taked is: in the technological process after sulfate slag is carried out flotation, gravity treatment or magnetic separation, adopt cold fixed mold pressing agglomeration operation, in sulfate slag, sulfate slag and iron ore concentrate compound, sulfate slag and the iron-containing waste compound of want mold pressing agglomeration, allocate adhesive, curing agent and additive in given ratio, behind the abundant mixing of mixer, carry out briquetting at stamping machine or on to roll squeezer, the finished product of extrusion is different shapes such as sphere, elliposoidal, oblate ellipsoid shape, cylindrical, non-cylindrical, square, rectangle.And the employing nature is placed or the method for artificial maintenance makes pelletizing reach best strength character, promptly can be used for metallurgical production.
In mold pressing agglomeration operation, the adhesive of allocating into can adopt the use of uniting of organic adhesion agent, inorganic adhesive or organic and inorganic two kinds of adhesive.Be specially:
When adopting organic adhesion agent, its amount of allocating into is generally 1%～10% of sulfate slag.During use, at first sulfate slag is mixed with adhesive, add additives such as an amount of curing agent, initator then as required, fully on stamping machine or pair roller ball press, carry out briquetting behind the mixing, be placed into naturally and promptly can be used for metallurgical production after intensity reaches requirement.
When adopting inorganic adhesive, its best amount of allocating into is 2%～12% of a sulfate slag.During use sulfate slag and adhesive and water are mixed together, add the additive of the fine grained mineral filler that is used to strengthen intensity then as required, its consumption is generally 0.5%～1% of sulfate slag.Abundant mixing carries out briquetting at last after adding on stamping machine or pair roller ball press, is placed into naturally promptly to can be used for metallurgical production after intensity reaches requirement.
When carrying out briquetting, also can unite and use organic adhesion agent and inorganic adhesive, during use, at first 2%～10% inorganic adhesive and sulfate slag and water are mixed together, add 1%～5% organic adhesion agent and other additive then, fully on stamping machine or pair roller ball press, carry out briquetting behind the mixing, be placed into naturally and promptly can be used for metallurgical production after intensity reaches requirement.
According to above-mentioned process, can effectively recycle sulfate slag, owing to when handling sulfate slag, adopt cold fixed operation to carry out the mold pressing agglomeration, without sintering and high-temperature roasting, and the cold bound pellet of producing has good shatter strength of green pellet and dry bulb compression strength performance, and have anti-water, weathering resistance, performance such as anti-aging, especially when using the associating adhesive, the drop strength of green-ball is big; The cold compression strength of dry bulb and hot compressive strength height, pelletizing breach does not break during high temperature.Possessed good high-temperature intensity and reducing property when therefore, the sulfate slag cooled agglomerated pellet after the processing is used to smelt iron.Compared with prior art, this new technology has advantages such as equipment is simple, easy to make, technological process is short, equipment investment is few, energy-conservation and pollution-free.
The specific embodiment:
Sulfate slag raw material of the present invention is recycled new technology, is in the technological process of handling the sulfate slag waste material, adopts cold concretion technology mold pressing agglomeration process step, is specially:
Step 1, at first the sulfate slag waste material is carried out flotation, gravity treatment or magnetic separation etc., improve the ferrous grade of sulfate slag, iron content is brought up to more than 60%, correspondingly reduce the content of sulphur in the sulfate slag simultaneously, make that sulfur content is reduced to below 0.3% in the sulfate slag, phosphorus content is less than 0.03%.(this step belongs to common process, is not giving unnecessary details)
Step 2 is carried out cold fixed mold pressing agglomeration with the sulfate slag after the choosing.Promptly in the sulfate slag of want mold pressing agglomeration, can use bright sulfur acid sludge waste material, also can adopt the iron ore concentrate compound of sulfate slag and 0～30% or the iron-containing waste compound of sulfate slag and 0～30%, wherein, iron-containing waste can adopt iron scale, flue dust, ironmaking mud etc., allocate adhesive, curing agent into, reach additive in given ratio, abundant mixing in mixer, carry out briquetting then at stamping machine or on to roll squeezer, the finished product of extrusion is different shapes such as sphere, elliposoidal, oblate ellipsoid shape, cylindrical, non-cylindrical, square, rectangle.Adopt the method for nature placement or artificial maintenance to make pelletizing reach best strength character, promptly can be used for metallurgical production.
In mold pressing agglomeration operation, the adhesive of allocating into can be the use of uniting of organic adhesion agent, inorganic adhesive or organic and inorganic two kinds of adhesive.Wherein, what organic adhesion agent adopted is Lauxite, phenolic resins, starch conversion glue, white glue with vinyl, pitch, cellulose and polyvinyl alcohol etc., and their consumption is generally 1%～10% of sulfate slag.During use, at first sulfate slag is mixed with adhesive, add an amount of curing agent then as required as ammonium chloride, benzene sulfonic acid sodium salt; Additive fully carries out briquetting behind the mixing as paper pulp fiber, polypropylene short fiber etc. on stamping machine or pair roller ball press, be placed into naturally promptly to can be used for metallurgical production after intensity reaches requirement.
What inorganic adhesive adopted is gypsum, cement, lime etc., and its best amount of allocating into is 2%～12% of a sulfate slag.During use sulfate slag and adhesive and water are mixed together, add other additive then as required, as: strengthen the fine grained mineral filler of intensity, sodium metasilicate reinforcing agent, blowing agent, accelerator, polymer short fiber etc. are arranged.Their consumption be generally sulfate slag 0.5%～1% between.Abundant mixing carries out briquetting at last after adding on stamping machine or pair roller ball press, is placed into naturally promptly to can be used for metallurgical production after intensity reaches requirement.
When briquetting, also can unite and use organic adhesion agent and inorganic adhesive, can use in the above-mentioned organic adhesion agent a kind of in any one or two kinds and the inorganic adhesive to mix use.During use, at first 2%～10% inorganic adhesive and sulfate slag and water are mixed together, add 1%～5% organic adhesion agent and other additive then, fully on stamping machine or pair roller ball press, carry out briquetting behind the mixing, be placed into naturally and promptly can be used for metallurgical production after intensity reaches requirement.
In the present invention, for the organic adhesion agent that uses, use the shatter strength of green pellet of Lauxite much better, but use the dry bulb intensity of phenolic resins better.This is because the curing rate of urea-formaldehyde resin adhesive when normal temperature is very fast.Therefore it is bigger to use Lauxite to make the green ball strength of pelletizing of adhesive.And the phenolic resins after fully solidifying is big than the intensity of Lauxite, and has resistance to elevated temperatures preferably, so the dry bulb intensity of the pelletizing of use phenolic resin as adhesive is big.Resin adhesive and fiber not only provide higher green ball strength, and because the existence of organic resin and fiber, pelletizing can cause organic burning when high temperature, mineral melt the elevated temperature strength that has improved pelletizing around making it on the one hand, on the other hand, the contact area of pelletizing and reducing gas has been improved in the space that organic matter after the burning stays, and has improved the reproducibility of pelletizing.With the high-temperature resistance adhesive of organic adhesion agent and the common preparation of inorganic adhesive, its feature is; Shatter strength of green pellet is big, the cold compression strength of dry bulb and hot compressive strength height, during high temperature pelletizing not breach, do not break.
Claims (8)
1, a kind of sulfate slag waste recovery is utilized new technology, it is characterized in that: sulfate slag is being carried out flotation, in the technological process after gravity treatment or the magnetic separation, adopt cold fixed mold pressing agglomeration operation, in the sulfate slag of want mold pressing agglomeration, allocate adhesive into according to given ratio, curing agent and additive, abundant mixing in mixer, carry out briquetting then at stamping machine or on to roll squeezer, the finished product that extrudes is spherical, elliposoidal, oblate ellipsoid shape, cylindrical, non-cylindrical, square, rectangle, and adopt the method for nature placement or artificial maintenance to make cooled agglomerated pellet reach the strength character requirement.
2, sulfate slag waste recovery according to claim 1 is utilized new technology, it is characterized in that: in mold pressing agglomeration operation, the adhesive of allocating into can adopt the use of uniting of organic adhesion agent, inorganic adhesive or organic and inorganic two kinds of adhesive.
3, sulfate slag waste recovery according to claim 1 and 2 is utilized new technology, it is characterized in that: when adopting organic adhesion agent, its amount of allocating into is 1%～10% of a sulfate slag, during use, at first sulfate slag is mixed with adhesive, add an amount of curing agent and initator then as required.
4, sulfate slag waste recovery according to claim 3 is utilized new technology, it is characterized in that: what organic adhesion agent adopted is Lauxite, phenolic resins, starch conversion glue, white glue with vinyl, pitch, cellulose and polyvinyl alcohol; What curing agent adopted is ammonium chloride, benzene sulfonic acid sodium salt, and what additive adopted is paper pulp fiber, polypropylene short fiber.
5, sulfate slag waste recovery according to claim 1 and 2 is utilized new technology, it is characterized in that: when adopting inorganic adhesive, its amount of allocating into is 2%～12% of a sulfate slag, during use sulfate slag and adhesive and water are mixed together, add the additive of the fine grained mineral filler be used to strengthen intensity then as required, its consumption is 0.5%～1% of a sulfate slag.
6, sulfate slag waste recovery according to claim 5 is utilized new technology, it is characterized in that: what inorganic adhesive adopted is gypsum, cement, lime, is used to strengthen that the additive of the fine grained mineral filler of intensity adopts is sodium metasilicate reinforcing agent, blowing agent, accelerator, polymer short fiber.
7, sulfate slag waste recovery according to claim 1 and 2 is utilized new technology, it is characterized in that: when adopting organic adhesion agent and inorganic adhesive to unite use, at first 2%～10% inorganic adhesive and sulfate slag and water are mixed together, add 1%～5% organic adhesion agent then.
8, sulfate slag waste recovery according to claim 1 is utilized new technology, it is characterized in that: in the sulfate slag of want mold pressing agglomeration, can use bright sulfur acid sludge waste material, also can adopt the iron ore concentrate compound of sulfate slag and 0～30% or the iron-containing waste compound of sulfate slag and 0～30%, wherein, iron-containing waste can adopt iron scale, flue dust, ironmaking mud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021358397A CN1185054C (en) | 2002-11-27 | 2002-11-27 | Process for recovering and reutilizing sulfuric acid dregs waste material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021358397A CN1185054C (en) | 2002-11-27 | 2002-11-27 | Process for recovering and reutilizing sulfuric acid dregs waste material |
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| Publication Number | Publication Date |
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| CN1425509A CN1425509A (en) | 2003-06-25 |
| CN1185054C true CN1185054C (en) | 2005-01-19 |
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| CNB021358397A Expired - Fee Related CN1185054C (en) | 2002-11-27 | 2002-11-27 | Process for recovering and reutilizing sulfuric acid dregs waste material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146917A (en) * | 2013-03-19 | 2013-06-12 | 蒋天勇 | Device for manufacturing slag pellets through sulfuric-acid residue and manufacturing method thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260460B (en) * | 2008-04-25 | 2010-06-02 | 重庆钢铁(集团)有限责任公司 | Technique for producing agglomeration by mixing sulfuric acid residue and concentrate |
| CN101549530B (en) * | 2008-12-30 | 2011-02-16 | 重庆科技学院 | Fast-setting water-hardening sludge cold hardened pellet and preparation method thereof |
| CN101554613B (en) * | 2009-05-19 | 2011-06-29 | 房志强 | Method for recycling industrial waste sulfate slag |
| CN102151613A (en) * | 2010-12-09 | 2011-08-17 | 古晓跃 | Method for recovering gold and silver by iron extraction, flotation and desulfurization after ultrasonic treatment of sulfate slag |
| CN106435171A (en) * | 2016-11-24 | 2017-02-22 | 攀枝花市徳铭再生资源开发有限公司 | Method for producing fine iron powder through sulfuric-acid residues |
| CN111809044A (en) * | 2020-07-27 | 2020-10-23 | 北京科技大学 | Multi-source complex low-grade iron ore resource utilization method and high-quality composite iron-making furnace burden |
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2002
- 2002-11-27 CN CNB021358397A patent/CN1185054C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146917A (en) * | 2013-03-19 | 2013-06-12 | 蒋天勇 | Device for manufacturing slag pellets through sulfuric-acid residue and manufacturing method thereof |
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