CN105331806A - Pellets manufactured through magnesium smelting waste and manufacturing method of pellets - Google Patents
Pellets manufactured through magnesium smelting waste and manufacturing method of pellets Download PDFInfo
- Publication number
- CN105331806A CN105331806A CN201510638333.1A CN201510638333A CN105331806A CN 105331806 A CN105331806 A CN 105331806A CN 201510638333 A CN201510638333 A CN 201510638333A CN 105331806 A CN105331806 A CN 105331806A
- Authority
- CN
- China
- Prior art keywords
- pellets
- magnesium
- mini
- waste
- slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- 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
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
Abstract
The invention relates to pellets manufactured through magnesium smelting waste and a manufacturing method of the pellets and belongs to the field of metal smelting waste reclamation and recycling and pellet manufacturing. According to the pellets, iron-containing waste/iron-containing dust slime or iron ore powder or a mixture of the iron-containing waste/iron-containing dust slime and the iron ore powder serves as a raw material, reducing slag dicalcium silicate C2S (2CaO SiO2) generated in the magnesium smelting process serves as a solvent, refining slag magnesium chloride (MgCl2) serves as a bonding agent, and the pellets of a certain grain diameter are manufactured through a pelletizing method. Due to the fact that the magnesium smelting waste is used for manufacturing the pellets, the treatment cost of the waste can be reduced, the pollution caused by the waste to the environment can be reduced, a great number of expensive solvents and bonding agents can be replaced, and the production cost of the pellets is reduced.
Description
Technical field
The present invention relates to Metal smelting changing rejected material to useful resource recycling and pelletizing manufacture field, more particularly, relate to a kind of mini-pellets utilizing Smelting magnesium waste residue to make and preparation method thereof.
Background technology
In recent years, China has become magnesium production in the world, big export country.But, in magnesium production process, produce a large amount of waste residues.The important method of China's production MAGNESIUM METAL is Pidgeon process, the essence of production of magnesium by pidgeonprocess is under high temperature and vacuum condition, when having calcium oxide to exist, generates magnesium steam by silicon (or aluminium) reduction-oxidation magnesium, the solid reduction slag generated with reaction is separated from each other, and obtains Crystalline Magnesium through condensation.Pidgeon process because of technical equipment simple, product purity is high and application is comparatively wide, but this method often produces the magnesium slag that 1 ton of MAGNESIUM METAL about discharges 15-20 ton.Magnesium cinder ladle draws together coal gas slag, refining slag and reducing slag, and wherein the main component of coal gas slag is silicon-dioxide (SiO
2) and aluminium sesquioxide (Al
2o
3), the main component in refining slag is water soluble chloride, as magnesium chloride (MgCl
2), sodium-chlor (NaCl) etc., the main component of reducing slag is calcium oxide (CaO), silicon-dioxide (SiO
2) etc.In the past, these Metal smelting waste residues were stacked or landfill all simply on the spot, caused the environmental problems such as land resources waste, environmental pollution, salting of soil, found suitable processing mode and seem particularly important.
Now main using Smelting magnesium waste residue as materials for wall, Load materials, cement burning material etc.The patent of invention being 201410459657.4 as application number discloses a kind of method utilizing Smelting magnesium slag to produce cement, but be need the strict index controlled in manufacture of cement owing to containing water miscible muriate in Smelting magnesium slag, cement quality and concrete stability are affected.
At present, pellet is one of main raw material of iron and steel, China's pellet output is in the developing state increased fast, to 2010 China pellet production capacity oneself reach 2.16 hundred million tons, but because the factors such as raw materials cost, fuel and equipment limit the production of China's pellet, the annual production to pellet in 2010 is about 1.40 hundred million tons.The raw material of pelletizing is the iron ore concentrate or iron content powder, flux, additive and binding agent that mix by a certain percentage.Conventional flux is mainly Wingdale, rhombspar etc., and additive and binding agent are mainly wilkinite, slaked lime etc.The flux that pelletizing makes and consumption of binder is large and cost height is the major cause that raw materials cost is high.
In fact, the composition of Smelting magnesium waste residue is one of main raw material of pellet.The most sintering plant of China adopts thin concentrate or the thin concentrate of part to be raw materials for sintering, owing to mixing into the thin concentrate of part, sintered mixture ventilation is bad, and a kind of effective way is that sinter mixture is caused pelletizing, the ventilation property of sinter mixture can be improved, and then improve the seed output and quality of agglomerate.The compositions such as the refining slag produced in Smelting magnesium process, reducing slag and Wingdale, bentonitic composition are close, and the flux that alternative or Some substitute Wingdale, wilkinite make as pelletizing and binding agent use, and effectively reduce pellet cost of manufacture.
Summary of the invention
For above-mentioned Problems existing, the invention discloses a kind of mini-pellets utilizing Smelting magnesium waste residue to make and preparation method thereof.
Mini-pellets of the present invention mainly utilizes the magnesium refining slag produced in Smelting magnesium as binding agent, and magnesium reduction slag, as solvent, makes an addition to powdered iron ore or iron-contained waste material, also or in both mixtures, and the pellet be made.
The concrete scheme of the making method that the present invention relates to is:
(i) by the magnesium refining slag of the magnesium reduction slag of 0.5-5 weight part, 0.1-2 weight part and the iron-contained waste material of 100 weight parts or powdered iron ore, also or both mixtures, Homogeneous phase mixing is particulate mixtures;
(ii) in the mixture of above-mentioned every 100 weight parts, mix the water of 10-20 weight part, mixture made with pelletizer the bulk or spherical mini-pellets that particle diameter is 3-8 millimeter;
(iii) mini-pellets is carried out the process such as drying, solidification health.
The main component of described magnesium reduction slag is Dicalcium Phosphate (Feed Grade); Mainly becoming as magnesium chloride of described magnesium refining slag.The iron-contained waste material used in the present invention is the ion dust mud contaning produced in sintering circuit.Generally, the particle diameter of pelletizing is less, and the intensity of pelletizing is higher.Particle diameter increase can make surface generation melting that the bonding force between pelletizing is weakened.Therefore the size that in the present invention, pelletizing is suitable is in 3 to 8mm scope.
Principle analysis
The principle analysis of ion dust mud contaning composition used in patent of the present invention and the alternative flux of magnesium slag is as follows.
After repetitive measurement, all iron content of ion dust mud contaning is generally at 40%-50%, and concrete chemical component is as shown in table 1.
The chemical composition of table 1 ion dust mud contaning
| Composition | Fe | SiO 2 | CaO | K | Na | Cl | C |
| Massfraction (%) | 40-50 | 4-6 | 8-12 | 2.5-5.0 | 0.2-0.6 | 1.5-4.5 | 3-5 |
Needed to maintain certain hardness as pellet feed by ion dust mud contaning, in addition, mini-pellets has the characteristic of decomposed at low temperature when sintering, and is the one of the main reasons that in sintering circuit, productivity reduces.So must use the binding agent such as wilkinite, slaked lime, but these binding agent prices are higher, and the present invention will reduce the bentonitic consumption of high price as far as possible or not use them.Refining slag magnesium chloride (the MgCl that the present invention will produce in Smelting magnesium operation
2) as binding agent, magnesium and ferric oxide can form spinel structure (tesseral system structure), have the characteristic suppressing to decompose, character is very excellent.
Secondly, the alternative Wingdale of the reducing slag produced in Smelting magnesium operation, rhombspar etc. are as flux material.Hereafter will be illustrated from its physics and chemical composition experimental result.
(1) chemical analysis of Smelting magnesium reducing slag
Analyze by the chemical composition of wet analysis method to reducing slag, the result obtained after repeatedly testing multiple sample is as shown in table 2.
The chemical composition of table 2 Smelting magnesium reducing slag
| Composition | Massfraction/% |
| SiO 2 | 15.0-20.0 |
| Al 2O 3 | 3.0-6.0 |
| Fe 2O 3 | 3.0-8.0 |
| CaO(free CaO) | 53.0-65.0（10.0-20.0） |
| MgO | 9.0-18.0 |
| SO 3 | 0.05-0.4 |
| Loss | 2.0-6.0 |
| Amount to | 98.0-99.7 |
As seen from table, the content of free calcium oxide is within the scope of 10%-20%, and swelling property is strong, therefore, it is possible to as the useful matter of pellet.
(2) fine-structure distribution
In order to observe shape and the size of reducing slag particle in Smelting magnesium, experiment uses scanning electronic microscope (SEM:ScanningElectronMicroscope) to carry out fine-structure distribution, and analytical results as shown in Figure 1.Find a part of circle and pointed part in molion, also been observed plate portion simultaneously.Observations shows, and reducing slag can substitute Wingdale, rhombspar etc. as solvent material.
(3) X-ray diffraction instrument analytical results
This experiment utilizes x-ray x ray diffractometer x analysis-reduction slag crystalline structure to infer its chemical composition.Arrange instrument to measure with the condition of 1 degree/min, the rear analysis software that utilizes carries out qualitative analysis.Analytical results as shown in Figure 2.Show in analytical results content the highest be free ca, be secondly magnesium oxide (MgO), consistent with chemical analysis results.
(4) density/specific surface area/residue of reducing slag
The density of reducing slag, fines content and residue are as shown in table 3.
The density of table 3 magnesium reduction slag, specific surface area and average residue content
| Density (g/cm3) | Specific surface area (cm 2/g) | Average residue content/% | |
| Reducing slag | 3.08 | 5760 | 35.8 |
The density of reducing slag, specific surface area and average residue content show the reasonableness that it is used as flux raw material.
The beneficial effect of patent of the present invention:
The present invention is the waste residue resource recycling will produced in magnesium metal smelting, manufactures the mini-pellets binding agent and flux that need in iron smelting procedure.Wherein, the main component magnesium chloride (MgCl of magnesium refining slag
2) can be used as binding agent, prevent mini-pellets from decomposing when low temperature (500 DEG C to 550 DEG C), affect productivity.The main component of magnesium reduction slag is Dicalcium Phosphate (Feed Grade) C
2s(2CaOSiO
2), as the flux in iron smelting procedure, temperature of smelting furnace can be maintained, improve the air permeability of smelting furnace, improve efficiency.In addition, the present invention is not only confined to metal waste residue recycling, also has remarkable effect saving starting material to reduce costs, to prevent in metal waste residue contaminate environment etc.
Accompanying drawing illustrates:
Accompanying drawing 1 is the images of main raw material magnesium reduction slag powder in the present invention.
Accompanying drawing 2 is x-ray analysis (XRD) images of main raw material magnesium reduction slag in the present invention.
Fig. 3 is pelletizing preparation flow schematic diagram in the present invention
Specific implementation method
Embodiment 1
The mini-pellets of embodiment 1 is manufactured according to following steps:
(1) ion dust mud contaning of 100 grams, the magnesium reduction slag powder (Dicalcium Phosphate (Feed Grade)) of 0.5 gram, the magnesium refining slag (magnesium chloride) of 0.1 gram are mixed.
(2) in the said mixture of every 100 grams, add the water of 10 grams, utilize rotary granulator (Pelletizer) to make the mini-pellets that particle diameter is 8 mm in sizes.
(3) mini-pellets is carried out the process such as drying, solidification health.
Carry out compressive strength test to 5 the plasticity mini-pellets samples made by above step, result is as shown in table 4.
The intensity (unit: Kg/mm2) of table 4 embodiment 1 mini-pellets sample
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | |
| Normal temperature strength | 48 | 50 | 49 | 52 | 45 |
Embodiment 2
The mini-pellets of embodiment 2 is manufactured according to following steps:
(1) ion dust mud contaning of 100 grams, the magnesium reduction slag powder (Dicalcium Phosphate (Feed Grade)) of 1 gram, the magnesium refining slag (magnesium chloride) of 0.5 gram are mixed.
(2) in the said mixture of every 100 grams, add the water of 13 grams, utilize rotary granulator (Pelletizer) to make the mini-pellets that particle diameter is 7 mm in sizes.
(3) mini-pellets is carried out the process such as drying, solidification health.
Carry out compressive strength test to 5 the plasticity mini-pellets samples made by above step, result is as shown in table 5.
The intensity (unit: Kg/mm2) of table 5 embodiment 1 mini-pellets sample
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | |
| Normal temperature strength | 70 | 68 | 71 | 68 | 67 |
Embodiment 3
The mini-pellets of embodiment 3 is manufactured according to following steps:
(1) ion dust mud contaning of 100 grams, the magnesium reduction slag powder (Dicalcium Phosphate (Feed Grade)) of 2 grams, the magnesium refining slag (magnesium chloride) of 1 gram are mixed.
(2) in the said mixture of every 100 grams, add the water of 18 grams, utilize rotary granulator (Pelletizer) to make the mini-pellets that particle diameter is 5 mm in sizes.
(3) mini-pellets is carried out the process such as drying, solidification health.
Carry out compressive strength test to 5 the plasticity mini-pellets samples made by above step, result is as shown in table 6.
The intensity (unit: Kg/mm2) of table 6 embodiment 1 mini-pellets sample
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | |
| Normal temperature strength | 86 | 85 | 86 | 86 | 88 |
Embodiment 4
The mini-pellets of embodiment 4 is manufactured according to following steps:
(1) ion dust mud contaning of 100 grams, the magnesium reduction slag powder (Dicalcium Phosphate (Feed Grade)) of 3 grams, the magnesium refining slag (magnesium chloride) of 1.5 grams are mixed.
(2) in the said mixture of every 100 grams, add the water of 20 grams, utilize rotary granulator (Pelletizer) to make the mini-pellets that particle diameter is 3 mm in sizes.
(3) mini-pellets is carried out the process such as drying, solidification health.
Carry out compressive strength test to 5 the plasticity mini-pellets samples made by above step, result is as shown in table 7.
The intensity (unit: Kg/mm2) of table 7 embodiment 1 mini-pellets sample
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | |
| Normal temperature strength | 104 | 102 | 100 | 106 | 105 |
Embodiment 5
The mini-pellets of embodiment 5 is manufactured according to following steps:
(1) ion dust mud contaning of 100 grams, the magnesium reduction slag powder (Dicalcium Phosphate (Feed Grade)) of 4 grams, the magnesium refining slag (magnesium chloride) of 2 grams are mixed.
(2) in the said mixture of every 100 grams, add the water of 15 grams, utilize rotary granulator (Pelletizer) to make the mini-pellets that particle diameter is 5 mm in sizes.
(3) mini-pellets is carried out the process such as drying, solidification health.
Carry out compressive strength test to 5 the plasticity mini-pellets samples made by above step, result is as shown in table 8.
The intensity (unit: Kg/mm2) of table 8 embodiment 1 mini-pellets sample
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | |
| Normal temperature strength | 92 | 90 | 93 | 94 | 90 |
Embodiment 6
The mini-pellets of embodiment 6 is manufactured according to following steps:
(1) ion dust mud contaning of 100 grams, the magnesium reduction slag powder (Dicalcium Phosphate (Feed Grade)) of 5 grams, the magnesium refining slag (magnesium chloride) of 1.5 grams are mixed.
(2) in the said mixture of every 100 grams, add the water of 10 grams, utilize rotary granulator (Pelletizer) to make the mini-pellets that particle diameter is 7 mm in sizes.
(3) mini-pellets is carried out the process such as drying, solidification health.
Carry out compressive strength test to 5 the plasticity mini-pellets samples made by above step, result is as shown in table 4.
The intensity (unit: Kg/mm2) of table 4 embodiment 1 mini-pellets sample
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | |
| Normal temperature strength | 84 | 87 | 88 | 81 | 87 |
Claims (3)
1. mini-pellets utilizing Smelting magnesium waste residue to make and preparation method thereof, it is characterized in that in the iron-contained waste material of every 100 weight parts or powdered iron ore or both mixtures, add the magnesium reduction slag of the 0.5-5 weight part as flux, and be used as the refining slag of 0.1-2 weight part of binding agent, obtain particulate mixtures; In the particulate mixtures of every 100 weight parts, add the water of 10-20 weight part, mixture made with pelletizer the bulk or spherical mini-pellets that particle diameter is 3-8 millimeter, be cured health, drying treatment obtains mini-pellets.
2. a kind of mini-pellets utilizing Smelting magnesium waste residue to make according to claim 1 and preparation method thereof, is characterized in that the main component of magnesium reduction slag is Dicalcium Phosphate (Feed Grade) C
2s(2CaOSiO
2).
3. a kind of mini-pellets utilizing Smelting magnesium waste residue to make according to claim 1 and preparation method thereof, is characterized in that the main component of magnesium refining slag is magnesium chloride (MgCl
2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510638333.1A CN105331806A (en) | 2015-10-05 | 2015-10-05 | Pellets manufactured through magnesium smelting waste and manufacturing method of pellets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510638333.1A CN105331806A (en) | 2015-10-05 | 2015-10-05 | Pellets manufactured through magnesium smelting waste and manufacturing method of pellets |
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| CN105331806A true CN105331806A (en) | 2016-02-17 |
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| CN201510638333.1A Pending CN105331806A (en) | 2015-10-05 | 2015-10-05 | Pellets manufactured through magnesium smelting waste and manufacturing method of pellets |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110904333A (en) * | 2019-12-09 | 2020-03-24 | 北京欧菲金太科技有限责任公司 | Method for discharging serpentine magnesium extraction tailings without solid waste |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956067A (en) * | 2009-07-20 | 2011-01-26 | 赵东民 | Binder for cold-pressed metallurgical pellets and preparation method and using method thereof |
| CN102373332A (en) * | 2010-08-17 | 2012-03-14 | 上海汉堂实业有限公司 | Ultra-micro magnesium carbonate pellet additive, preparation method thereof, and application thereof |
| CN102676799A (en) * | 2012-03-30 | 2012-09-19 | 东北大学 | Preparation method for boron-magnesium composite additive for pellets and product |
| CN102899483A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Recycling process for low-frequency (LF) furnace refining slag |
| CN103436694A (en) * | 2013-09-04 | 2013-12-11 | 宁夏天元锰业有限公司 | Method for preparing chrome ore pellets |
-
2015
- 2015-10-05 CN CN201510638333.1A patent/CN105331806A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956067A (en) * | 2009-07-20 | 2011-01-26 | 赵东民 | Binder for cold-pressed metallurgical pellets and preparation method and using method thereof |
| CN102373332A (en) * | 2010-08-17 | 2012-03-14 | 上海汉堂实业有限公司 | Ultra-micro magnesium carbonate pellet additive, preparation method thereof, and application thereof |
| CN102676799A (en) * | 2012-03-30 | 2012-09-19 | 东北大学 | Preparation method for boron-magnesium composite additive for pellets and product |
| CN102899483A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Recycling process for low-frequency (LF) furnace refining slag |
| CN103436694A (en) * | 2013-09-04 | 2013-12-11 | 宁夏天元锰业有限公司 | Method for preparing chrome ore pellets |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110904333A (en) * | 2019-12-09 | 2020-03-24 | 北京欧菲金太科技有限责任公司 | Method for discharging serpentine magnesium extraction tailings without solid waste |
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Application publication date: 20160217 |
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