CN107460308A - A kind of limonite arsenic removing method - Google Patents
A kind of limonite arsenic removing method Download PDFInfo
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- CN107460308A CN107460308A CN201710656789.XA CN201710656789A CN107460308A CN 107460308 A CN107460308 A CN 107460308A CN 201710656789 A CN201710656789 A CN 201710656789A CN 107460308 A CN107460308 A CN 107460308A
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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
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Abstract
The invention discloses a kind of limonite arsenic removing method.Comprise the following steps：（1）Limonite, reduction coal dust is according to mass ratio 100:（4~7）It is well mixed；（2）Mixed sample ore is loaded into iron flask, is put into high temperature furnace, reaction temperature is 800 ~ 900 DEG C, is incubated 35 ~ 45 minutes；（3）Cooling, ore grinding, low intensity magnetic separation are taken out after insulation；（4）By the concentrate after magnetic separation and bentonite in mass ratio 100:（1~8）Pelletizing, is then placed in stove the oxidizing roasting under conditions of 1250 ~ 1350 DEG C, and roasting time is 20 ~ 30 minutes；The oxidant potassium permanganate of its quality 1 ~ 5% is added in bentonite.The technical program has technological process simple, and production cost is low, and environmental pollution is small, the characteristics of dearsenification positive effect.
Description
Technical field
The invention belongs to technical field of resource comprehensive utilization, and in particular to a kind of limonite arsenic removing method.
Background technology
Steel containing arsenic is heated at high temperature, it may appear that surface for a long time under the process conditions normally rolled in oxidizing atmosphere
Enriched layer, cause hot-working surface checking.It is segregated the development for seriously promoting steel banded structure in steel, reduces rushing for steel
Toughness is hit, easily steel is ftractureed in hot procedure.Therefore, the requirement in steelmaking process to arsenic content is extremely strict.
For limonite containing arsenic, due to the easy argillization of grinding process, the beneficiation method using routine is difficult to improve Iron grade
While, arsenic content is down to the level for meeting industrial requirements.Currently used arsenic removing method is that molten iron is handled, and is passed through
The alkaline metal salts such as calcium oxide, calcirm-fluoride are added to reduce the arsenic content in molten iron.But alkali metal salt is due in On Dearsenization of Molten Iron
Process dosage is big, the factors such as itself price is higher in addition so that molten iron pretreatment dearsenification cost is higher, is suitable as depth and takes off
Arsenic means, when iron Water jet cleaning is higher, this method is not just a kind of economic dearsenification means, merely by molten iron processing dearsenification
Effective utilization containing symplesite can not be realized.
Wuhan University Of Technology's fourth treasured is carried in iron dearsenification experimental study into grade for limonite uses magnetizing roast-magnetic separation-to make
Ball-oxidizing roasting technique, realize and arsenic content is reduced to 0.022% while iron ore grade improves, but it does not have to dearsenification
The oxidizing roasting of most critical is furtherd investigate.
Product after magnetizing roast still contains a small amount of Fe3O4, oxygen deficiency in pelletizing, or green-ball structure is uneven to be made
Obtain Fe inside ball3O4Non- complete oxidation and crystallize, the oxidation of retardance arsenic is shunk in slag phase melting, and then the removing of arsenic is not thorough.
The content of the invention
The purpose of the present invention is to be directed to the problem of separating by extraction of limonite containing arsenic is low, there is provided a kind of technological process is simple, ring
Pollute a kind of small limonite arsenic removing method in border.
To realize goal of the invention, technical solution of the invention is：A kind of limonite arsenic removing method, including following step
Suddenly：
（1）Limonite, reduction coal dust is according to mass ratio 100:（4~7）It is well mixed；
（2）Mixed sample ore is loaded into iron flask, is put into high temperature furnace, reaction temperature is 800 ~ 900 DEG C, is incubated 35 ~ 45 minutes；
（3）Cooling, ore grinding, low intensity magnetic separation are taken out after insulation；
（4）By the concentrate after magnetic separation and bentonite in mass ratio 100:（1~8）Pelletizing, it is then placed in stove 1250 ~ 1350
Oxidizing roasting under conditions of DEG C, roasting time are 20 ~ 30 minutes；The oxidant permanganic acid of its quality 1 ~ 5% is added in bentonite
Potassium.
Specifically, the limonite Iron grade is the wt% of 41.74 wt% ~ 48.86, and arsenic grade is 0.11 wt% ~ 0.22
Wt%, the particle diameter of limonite are less than 3mm.
Specifically, the reduction coal dust is popular smokeless coal dust, and its main chemical compositions is：CGu78.38%、Ad12.50、
Vd8.31%。
Specifically, the high temperature furnace is resistance furnace, rotary hearth furnace, rotary kiln or industrial microwave oven, the stove of oxidizing roasting
For tube furnace, shaft furnace, rotary kiln or rotary hearth furnace.
Specifically, the product of roasting low intensity magnetic separation mog is that -0.074mm accounts for 97.51wt%, magnetic field intensity is 190 ~
250kA/m。
Specifically, 850 ~ 950 DEG C of the oxidizing roasting preheating temperature, 10 ~ 30 minutes preheating time.
This method adds bentonite in oxidizing roasting step, and oxidant potassium permanganate is added in bentonite.Bentonite
Typical layered structure cause it that there is special compatibility with water, after water is met, not only water absorbent surface, its interlayer also adsorb one
Quantitative moisture, turn into Coating combination water, so as to accordingly reduce the available moisture of balling process, make the reduction of green-ball rate of growth,
The compact and uniform structure of ball, the gas permeability of layers of balls improve, and oxygen penetrates the top layer of ball and inwardly spread in roasting process, enters inside
Row oxidation, arsenic-containing ores directly decompose under high temperature action and are oxidized to arsenic oxide.Arsenic oxide has arsenic trioxide and five
Aoxidize two kinds of two arsenic, wherein diarsenic pentoxide can be changed into arsenic trioxide and direct due to the less stable under air ambient
Distil as flue gas (arsenic trioxide sublimation temperature is more than 270 DEG C), and directly volatilized from tube furnace.Match somebody with somebody in bentonite and increase
Potassium manganate, oxygen is produced during high-temperature roasting, can speed up the oxidation removal of arsenic.
The beneficial effect of technical solution of the present invention is：
（1）The technical program can utilize pelletizing-roasting process of iron ore, have work compared with traditional iron ore dearsenicating technology
Skill is simple, it is not necessary in addition the advantages of increase equipment, the arsenic of removing out can be reclaimed by flue, it is ensured that full
Toe ring guaranteed request；
（2）The acid pellet Iron grade that the technical program obtains is 59.53wt%~64.23wt%, iron recovery is 92.87~
96.67wt%, wherein arsenic content are 0.009 wt%~0.016wt%, therefore dearsenification positive effect, and arsenic-removing rate is up to 88 more than wt%.
（3）The raw materials used anthracite and bentonite to commonly use of the technical program, source is wide, and price is low.
（4）The technical program can improve the grade of iron while dearsenification.
Therefore, the technical program has technological process simple, and production cost is low, and environmental pollution is small, dearsenification positive effect
The characteristics of.
Brief description of the drawings
A kind of process chart of limonite arsenic removing method.
Embodiment
Embodiments of the invention are described in detail below.The embodiments described below with reference to the accompanying drawings are exemplary, only
For explaining the present invention, and it is not considered as limiting the invention.
In this embodiment：Carbonaceous reducing agent is common carbon dust, and its main chemical compositions is：CGu78.38%、
Ad12.50、Vd8.31%；Product of roasting low intensity magnetic separation mog is that -0.074mm accounts for 97.51wt%, and magnetic field intensity is
218.95kA/m；The high temperature furnace of oxidizing roasting is tube furnace.Repeated no more in embodiment.
Embodiment 1
A kind of arsenic removing method of limonite containing arsenic.The Iron grade of the limonite is 43.57 wt%, and arsenic grade is 0.14 wt%, particle diameter
Less than 3mm, its method is：
（1）By limonite, reduction coal dust is according to mass ratio 100:5 is well mixed,
（2）Mixed sample ore is fitted into iron flask, is put into Muffle furnace, reaction temperature is 850 DEG C, is incubated 40 minutes；
（3）Cooling, ore grinding, low intensity magnetic separation are taken out after insulation；
（4）By the concentrate pelletizing after magnetic separation, concentrate is 100 with bentonite mass ratio:1, the oxygen of its quality 2% is added in bentonite
Agent potassium permanganate, bead is put into stove the oxidizing roasting under conditions of 1250 DEG C, roasting time is 25 minutes.
Acid pellet iron powder grade 59.53wt%, the iron recovery 93.72wt% that the present embodiment obtains, wherein arsenic content
For 0.015 wt %, arsenic-removing rate is 89.29 wt %.
Embodiment 2
A kind of arsenic removing method of limonite containing arsenic.The Iron grade of the limonite is 43.57wt%, and arsenic grade is 0.14 wt %, particle diameter
Less than 3mm, its method is：
（1）By limonite, reduction coal dust is according to mass ratio 100:5 is well mixed,
（2）Mixed sample ore is fitted into iron flask, is put into Muffle furnace, furnace temperature rises to 850 DEG C, is incubated 40 minutes；
（3）Cooling, ore grinding, low intensity magnetic separation are taken out after insulation；
（4）By the concentrate pelletizing after magnetic separation, concentrate is 100 with bentonite mass ratio:2, the oxygen of its quality 2% is added in bentonite
Agent potassium permanganate, bead is put into stove the oxidizing roasting under conditions of 1250 DEG C, roasting time is 25 minutes.
The acid pellet iron powder grade that the present embodiment obtains is 60.79wt%, and iron recovery is 94.13 wt%, and wherein arsenic contains
It is 90.71 wt % to measure as 0.013wt%, arsenic-removing rate.
Embodiment 3
A kind of arsenic removing method of limonite containing arsenic.The Iron grade of the limonite is 43.57wt%, and arsenic grade is 0.14 wt %, particle diameter
Less than 3mm, its method is：
（1）By limonite, reduction coal dust is according to mass ratio 100:5 is well mixed,
（2）Mixed sample ore is fitted into iron flask, is put into Muffle furnace, furnace temperature rises to 850 DEG C, is incubated 40 minutes；
（3）Cooling, ore grinding, low intensity magnetic separation are taken out after insulation；
（4）By the concentrate pelletizing after magnetic separation, concentrate is 100 with bentonite mass ratio:4, its quality, 2% oxygen are added in bentonite
Agent potassium permanganate, bead is put into stove the oxidizing roasting under conditions of 1250 DEG C, roasting time is 25 minutes.
The acid pellet iron powder grade 64.07wt% that the present embodiment obtains, iron recovery are 96.41 wt%, wherein arsenic content
For 0.010wt%, arsenic-removing rate is 92.86 wt %.
Embodiment 4
A kind of arsenic removing method of limonite containing arsenic.The Iron grade of the limonite is 43.57wt%, and arsenic grade is 0.14 wt %, particle diameter
Less than 3mm, its method is：
（1）By limonite, reduction coal dust is according to mass ratio 100:5 is well mixed,
（2）Mixed sample ore is fitted into iron flask, is put into Muffle furnace, furnace temperature rises to 850 DEG C, is incubated 40 minutes；
（3）Cooling, ore grinding, low intensity magnetic separation are taken out after insulation；
（4）By the concentrate pelletizing after magnetic separation, concentrate is 100 with bentonite mass ratio:8, its quality, 2% oxygen are added in bentonite
Agent potassium permanganate, bead is put into stove the oxidizing roasting under conditions of 1250 DEG C, roasting time is 25 minutes.
The acid pellet iron powder grade 62.24wt% that the present embodiment obtains, iron recovery are 92.87 wt%, wherein arsenic content
For 0.016wt%, arsenic-removing rate is 88.57 wt %.
Embodiment 5
A kind of arsenic removing method of limonite containing arsenic.The Iron grade of the limonite is 43.57wt%, and arsenic grade is 0.14 wt %, particle diameter
Less than 3mm, its method is：
（1）By limonite, reduction coal dust is according to mass ratio 100:5 is well mixed,
（2）Mixed sample ore is fitted into iron flask, is put into Muffle furnace, furnace temperature rises to 850 DEG C, is incubated 40 minutes；
（3）Cooling, ore grinding, low intensity magnetic separation are taken out after insulation；
（4）By the concentrate pelletizing after magnetic separation, concentrate is 100 with bentonite mass ratio:4, the oxygen of its quality 4% is added in bentonite
Agent potassium permanganate, bead is put into stove the oxidizing roasting under conditions of 1250 DEG C, roasting time is 25 minutes.
The acid pellet iron powder grade 64.23wt% that the present embodiment obtains, iron recovery are 96.67 wt%, wherein arsenic content
For 0.009wt%, arsenic-removing rate is 96.91 wt%.
Embodiment 6
A kind of arsenic removing method of limonite containing arsenic.The Iron grade of the limonite is 43.57wt%, and arsenic grade is 0.14 wt %, particle diameter
Less than 3mm, its method is：
（1）By limonite, reduction coal dust is according to mass ratio 100:5 is well mixed,
（2）Mixed sample ore is fitted into iron flask, is put into Muffle furnace, furnace temperature rises to 850 DEG C, is incubated 40 minutes；
（3）Cooling, ore grinding, low intensity magnetic separation are taken out after insulation；
（4）By the concentrate pelletizing after magnetic separation, bentonite and potassium permanganate are not added, and bead is put into stove in 1250 DEG C of condition
Lower oxidizing roasting, roasting time are 25 minutes.
The acid pellet iron powder grade 63.07wt% that the present embodiment obtains, iron recovery are 94.87 wt%, wherein arsenic content
For 0.037wt%, arsenic-removing rate is 73.57 wt%.
Present embodiment has following good effect：
（1）Present embodiment can utilize pelletizing-roasting process of iron ore, tool compared with traditional iron ore dearsenicating technology
There is technique simple, it is not necessary in addition the advantages of increase equipment, can be reclaimed by flue to the arsenic of removing out, really
Guarantor meets environmental requirement；
（2）The acid pellet Iron grade that present embodiment obtains is 59.53wt%~64.23wt%, iron recovery 92.87
~96.67wt%, wherein arsenic content are 0.009 wt%~0.016wt%, therefore dearsenification positive effect, arsenic-removing rate up to 88wt% with
On；
（3）The raw materials used anthracite and bentonite to commonly use of present embodiment, source is wide, and price is low；
（4）Present embodiment can improve the grade of iron while dearsenification.
Therefore, present embodiment has technological process simple, and production cost is low, and environmental pollution is small, dearsenification effect
The characteristics of obvious.
The explanation of above-described embodiment is only intended to understand the method and its core concept of the present invention.It should be pointed out that for this
For the those of ordinary skill in field, under the premise without departing from the principles of the invention, some improvement can also be carried out to the present invention
And modification, these are improved and modification will be also fallen into the protection domain of the claims in the present invention.
Claims (6)
1. a kind of limonite arsenic removing method, it is characterised in that comprise the following steps：
（1）Limonite, reduction coal dust is according to mass ratio 100:（4~7）It is well mixed；
（2）Mixed sample ore is loaded into iron flask, is put into high temperature furnace, reaction temperature is 800 ~ 900 DEG C, is incubated 35 ~ 45 minutes；
（3）Cooling, ore grinding, low intensity magnetic separation are taken out after insulation；
（4）By the concentrate after magnetic separation and bentonite in mass ratio 100:（1~8）Pelletizing, it is then placed in stove 1250 ~ 1350
Oxidizing roasting under conditions of DEG C, roasting time are 20 ~ 30 minutes；The oxidant permanganic acid of its quality 1 ~ 5% is added in bentonite
Potassium.
2. a kind of limonite arsenic removing method according to claim 1, it is characterised in that the limonite Iron grade is 41.74
The wt% of wt% ~ 48.86, arsenic grade are the wt% of 0.11 wt% ~ 0.22, and the particle diameter of limonite is less than 3mm.
3. a kind of limonite arsenic removing method according to claim 1, it is characterised in that the reduction coal dust is popular smokeless
Coal dust, its main chemical compositions are：CGu78.38%、Ad12.50、Vd8.31%。
4. a kind of limonite arsenic removing method according to claim 1, it is characterised in that the high temperature furnace is resistance furnace, turns bottom
Stove, rotary kiln or industrial microwave oven, the stove of oxidizing roasting is tube furnace, shaft furnace, rotary kiln or rotary hearth furnace.
A kind of 5. limonite arsenic removing method according to claim 1, it is characterised in that the product of roasting low intensity magnetic separation ore grinding
Fineness is that -0.074mm accounts for 97.51wt%, and magnetic field intensity is 190 ~ 250kA/m.
A kind of 6. limonite arsenic removing method according to claim 1, it is characterised in that the oxidizing roasting preheating temperature 850
~ 950 DEG C, 10 ~ 30 minutes preheating time.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115354155A (en) * | 2022-07-11 | 2022-11-18 | 长沙有色冶金设计研究院有限公司 | System and method for microwave dearsenification of arsenic-containing material |
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Application publication date: 20171212 |