CN104762432A - Method for restoring and extracting iron components in acid leaching vanadium tailings - Google Patents
Method for restoring and extracting iron components in acid leaching vanadium tailings Download PDFInfo
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- CN104762432A CN104762432A CN201510213515.4A CN201510213515A CN104762432A CN 104762432 A CN104762432 A CN 104762432A CN 201510213515 A CN201510213515 A CN 201510213515A CN 104762432 A CN104762432 A CN 104762432A
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- Y02P10/20—Recycling
Abstract
The invention discloses a method for restoring and extracting iron components in acid leaching vanadium tailings, relates to the field of recycling of vanadium tailings and provides a method for recycling iron components in acid leaching vanadium tailings, and the method is high in recycling efficiency. The method comprises the following steps that A, under normal temperature and normal pressure, acid leaching vanadium tailings, anthractite and iron powder are mixed evenly to form a mixed raw material, and the weight ratio of the acid leaching vanadium tailings, the anthractite to the iron powder in the acid leaching vanadium tailings in the mixed raw material is 90-93: 7.5-8.5: 0.5-1; B, the mixed raw material is put into pressing equipment to be pressed to be a roasting sample; C, the roasting sample is put into a vertical roasting furnace with nitrogen protecting atmosphere to be subjected to high-temperature modified direct reduction, and a reduction sample is obtained after reduction; D, the reduction sample is ground to obtain a ground sample, and magnetic separation is carried out on the ground sample to obtain metal iron. The iron powder is added into the mixed raw material and serves as a nucleating agent, growth of the iron components is promoted, and recycling of the iron components is facilitated.
Description
Technical field
The present invention relates to tailings in vanadium extraction and recycle field, particularly relate to and a kind ofly reduce and extract the method for iron component in acid-leaching vanadium-extracted tailings.
Background technology
Acid-leaching vanadium-extracted tailings is a kind of solid waste from iron and steel enterprise, and mineral composition is complicated, annual production large, and a large amount of soil is is not only occupied in outdoor accumulation, returns surrounding soil and water surrounding causes severe contamination.In acid-leaching vanadium-extracted tailings, iron level is more than 30%, has higher recycling to be worth.But because mineralogy composition is complicated, people seldom pay close attention to the technology wherein extracting iron.In recent years, along with China's steel industry development is to the increase of iron ore deposit demand and the rise of iron ore deposit price, the value that tailings in vanadium extraction utilizes as secondary iron ore deposit attracts attention gradually.From tailings in vanadium extraction, separating and extracting Fe not only effectively utilizes significant to metallurgical secondary resource, and the reality of building a resource-conserving society especially embodies.
Acid-leaching vanadium-extracted tailings is developed and mainly concentrates on the following aspects: one is that acid-leaching vanadium-extracted tailings is carried out secondary vanadium extraction, and current research mainly concentrates on normal pressure or pressurized acid leaching process for extracting vanadium; Two is that acid-leaching vanadium-extracted tailings can as the filler of far ultrared paint through Overheating Treatment and modification, substituting cobalt series black pigment; Three is utilize tailings in vanadium extraction to have the characteristics such as higher photo-thermal specific absorption, infrared emittance and higher photo-thermal conversion efficiency, by tailings in vanadium extraction calcining black ceramic material processed.
University of Science & Technology, Beijing professor Yang Huifen have studied with the alkaline tailings in vanadium extraction of Chengde Iron and Steel Group Co., Ltd as raw material, adopt the technique of direct-reduction ~ mill ore magnetic selection, the finished product index that tailings in vanadium extraction direct-reduction prepares metal iron powder is: iron powder grade 90.31%, and the rate of recovery of iron is 91.98%.The TiO of 97.87% is had in former slag
2be enriched in the slag after magnetic separation mutually in, the slag of acquisition mutually in TiO
2massfraction, up to 14.04%, can be used as and reclaims TiO further
2raw material use.
The Chengde Iron and Steel Group Co., Ltd Du Wei tinkling of pieces of jade and Chen Hua have studied the recycling that alkaline vanadium extraction vanadium tailing soil returns blast furnace process, consider the impact of the B F that tailings in vanadium extraction contains, as long as it controls in ton ore deposit with addition of 20kg tailings in vanadium extraction with addition of amount, 0.6% is improve, successful with addition of its machine burning ore deposit tumbler index rear.According to annual 300000 tons of tailings in vanadium extraction with addition of, 9.3 ten thousand tons can be smelted iron, extract Vanadium Pentoxide in FLAKES 2300 tons, accumulative create beneficial result about 7,829 ten thousand yuan.
Although above-mentioned several method has all carried out utilization in various degree to the iron component in tailings in vanadium extraction, the problem such as technological process all exists pollution in various degree, total yield is on the low side.Simultaneously present stage open source literature great majority for tailings in vanadium extraction are all vanadium slag alkaline tailings in vanadium extraction after sodium roasting vanadium-extracting, do not relate to the utilization of acid tailings in vanadium extraction.In addition, in above-mentioned technology, iron component nucleation and effect of growing up generally, have impact on the rate of recovery of iron component.
Summary of the invention
The technical problem to be solved in the present invention is: provide one can recycle iron component in acid-leaching vanadium-extracted tailings, and the high reduction of recovery utilization rate extract the method for iron component in acid-leaching vanadium-extracted tailings.
In order to solve the problem, the technical scheme adopted is: reduce and the method extracting iron component in acid-leaching vanadium-extracted tailings comprises the steps:
A, at normal temperatures and pressures, acid tailings in vanadium extraction, hard coal and iron powder are mixed formation mixing raw material, in mixing raw material, the ratio of the weight of acid tailings in vanadium extraction, hard coal and iron powder is: 90 ~ 93:7.5 ~ 8.5:0.5 ~ 1;
B, mixing raw material is put into pressing device be pressed into roasting sample;
C, roasting sample is put into the vertical stoving oven with nitrogen protection atmosphere carry out high temperature modified direct-reduction, obtain after reduction going back raw sample;
D, reduction sample ground obtain grinding sample, sample magnetic separation will be ground and obtain metallic iron.
Further: acid tailings in vanadium extraction refers to the acid slag of vanadium slag grog after sulfuric acid leaching after vanadium slag calcification baking, its iron oxide content between 32 ~ 40%, TV content is less than 1%.
Further: in step B, mixing raw material is suppressed under 40MPa pressure condition, and roasting sample is cylindrical, and the diameter of roasting sample is 3cm, is highly 0.3cm.
Further: in step C, the processing parameter of high temperature modified direct-reduction is: reduction temperature is 1150 DEG C, and the recovery time is 1.5 hours, and nitrogen flow is 2L/min, and nitrogen gas purity is greater than 99%.
Further: in step D, ore milling concentration is 60% ~ 70%; The sample accounting that grinds that granularity is less than 0.074mm is 85 ~ 90%; Grind sample and carry out magnetic separation under magneticstrength is 70kA/m condition.
The invention has the beneficial effects as follows: 1, on the Process ba-sis of traditional direct-reduction, novelty add iron powder; Iron powder, as nucleating agent, facilitates growing up of iron component, is beneficial to iron component and recycles.
2, technological process really achieves and clean carries iron, whole iron-extracting process clean environment firendly, material closed cycle, does not have the generation of a large amount of waste water and waste gas.
4, product directly as steelmaking feed, can substantially reduce the technical process of being processed into steel from iron ore, avoids the environmental pollution that pellet sinters, blast furnace ironmaking produces, has obvious environmental benefit and energy conservation and consumption reduction effects.
5, technological process index is high, and under lower reduction temperature, product grade is high, and final iron level reaches more than 90%; The whole rate of recovery putting forward iron process is more than 76%.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
To reduce and the method extracting iron component in acid-leaching vanadium-extracted tailings comprises the steps:
A, at normal temperatures and pressures, acid tailings in vanadium extraction, hard coal and iron powder are mixed formation mixing raw material, in mixing raw material, the ratio of the weight of acid tailings in vanadium extraction, hard coal and iron powder is: 90 ~ 93:7.5 ~ 8.5:0.5 ~ 1;
B, mixing raw material is put into pressing device be pressed into roasting sample;
C, roasting sample is put into the vertical stoving oven with nitrogen protection atmosphere carry out high temperature modified direct-reduction, obtain after reduction going back raw sample;
D, reduction sample ground obtain grinding sample, sample magnetic separation will be ground and obtain metallic iron.
Acid tailings in vanadium extraction of the present invention refers to the acid slag of vanadium slag grog after sulfuric acid leaching after vanadium slag calcification baking, its iron oxide content between 32 ~ 40%, TV content is less than 1%.Ore milling concentration refers to that solid weight accounts for the ratio of solid and water gross weight.
The reductive agent that present invention process process adopts is hard coal, and its ash oontent is low, the iron component can reduced greatly in tailings in vanadium extraction.Include iron powder in mixing raw material, iron powder, as nucleating agent, is conducive to the grain nucleation and growth of iron component in reduction process simultaneously, carries iron establish condition for lower step stages of magnetic separation separation.Resultant metal iron level that iron obtains is carried more than 90% through direct-reduction-ore grinding-magnetic separation, can directly as steelmaking feed.
For ensureing best reduction and extraction effect, the present invention's each step concrete technology parameter is as follows: in step B, mixing raw material is suppressed under 40MPa pressure condition, and roasting sample is cylindrical, and the diameter of roasting sample is 3cm, is highly 0.3cm.In step C, the processing parameter of high temperature modified direct-reduction is: reduction temperature is 1150 DEG C, and the recovery time is 1.5 hours, and nitrogen flow is 2L/min, and nitrogen gas purity is greater than 99%.In step D, ore milling concentration is 60% ~ 70%; The sample accounting that grinds that granularity is less than 0.074mm is 85 ~ 90%; Grind sample and carry out magnetic separation under magneticstrength is 70kA/m condition.
Embodiment 1:
The present embodiment raw material is the acid tailings in vanadium extraction of Pangang Group Xichang Steel & Vanadium Co., Ltd., tailings iron content 34.21%, calcium oxide 9.92%, silica 1 5.34%, full content of vanadium 0.84%.Ingredients by weight is than being tailings in vanadium extraction: hard coal (fixed carbon content 80.34%): iron powder (grade is the iron powder of 98.75%)=91.5:7.9:0.6.After abundant mixing under 40MPa pressure condition, be pressed into diameter and be 3cm, be highly the roasting sample of 0.3cm, sample is put into the vertical stoving oven that temperature is 1150 DEG C, nitrogen flow is 1.5L/min and is carried out direct-reduction 90min.After grinding in grinding machine after cooling, iron is carried in magnetic separation, and ore milling concentration is 65%, and the sample that grinds that granularity is less than 0.074mm accounts for 88%, grinds sample magnetic separation under magneticstrength is 70kA/m condition and obtains metallic iron.Metallic iron grade is 92.01%, all iron content is 97.21%.
Embodiment 2:
The present embodiment raw material is the acid tailings in vanadium extraction of Pangang Group Xichang Steel & Vanadium Co., Ltd., tailings iron content 36.01%, calcium oxide 9.12%, silica 1 4.64%, full content of vanadium 0.88%.Proportion scale is tailings in vanadium extraction: hard coal (fixed carbon content 79.68%): iron powder (grade is the iron powder of 98.75%)=90.5:8.5:1.After abundant mixing under 40MPa pressure condition, be pressed into diameter and be 3cm, be highly the roasting sample of 0.3cm, sample is put into the vertical stoving oven that temperature is 1150 DEG C, nitrogen flow is 1.5L/min and is carried out direct-reduction 90min.After grinding in grinding machine after cooling, iron is carried in magnetic separation, and ore milling concentration is 68%, and the sample that grinds that granularity is less than 0.074mm accounts for 84%, grinds sample magnetic separation under magneticstrength is 70kA/m condition and obtains metallic iron.Metallic iron grade is 91.16%, all iron content is 96.46%.
Embodiment 3:
The present embodiment raw material is the acid tailings in vanadium extraction of Pangang Group Xichang Steel & Vanadium Co., Ltd., tailings iron content 36.38%, calcium oxide 9.22%, silica 1 4.38%, full content of vanadium 0.78%.Proportion scale is tailings in vanadium extraction: hard coal (fixed carbon content 80.34%): iron powder (grade is the iron powder of 98.75%)=91:8.2:0.8.After abundant mixing under 40MPa pressure condition, be pressed into diameter and be 3cm, be highly the roasting sample of 0.3cm, sample is put into the vertical stoving oven that temperature is 1150 DEG C, nitrogen flow is 1.5L/min and is carried out direct-reduction 90min.After grinding in grinding machine after cooling, iron is carried in magnetic separation, and ore milling concentration is 67%, and the sample that grinds that granularity is less than 0.074mm accounts for 89%, grinds sample magnetic separation under magneticstrength is 70kA/m condition and obtains metallic iron.Metallic iron grade is 90.76%, all iron content is 95.88%.
Embodiment 4: the present embodiment raw material is the acid tailings in vanadium extraction of Pangang Group Xichang Steel & Vanadium Co., Ltd., tailings iron content 34.21%, calcium oxide 9.92%, silica 1 5.34%, full content of vanadium 0.84%.Ingredients by weight is than being tailings in vanadium extraction: hard coal (fixed carbon content 80.34%)=92:8.0.After abundant mixing under 40MPa pressure condition, be pressed into diameter and be 3cm, be highly the roasting sample of 0.3cm, sample is put into the vertical stoving oven that temperature is 1150 DEG C, nitrogen flow is 1.5L/min and is carried out direct-reduction 90min.After grinding in grinding machine after cooling, iron is carried in magnetic separation, and ore milling concentration is 65%, and the sample that grinds that granularity is less than 0.074mm accounts for 90%, grinds sample magnetic separation under magneticstrength is 70kA/m condition and obtains metallic iron.Metallic iron grade is 84.01%, all iron content is 88.21%.
Claims (5)
1. reduce and extract the method for iron component in acid-leaching vanadium-extracted tailings, it is characterized in that: comprise the steps:
A, at normal temperatures and pressures, acid tailings in vanadium extraction, hard coal and iron powder are mixed formation mixing raw material, in mixing raw material, the ratio of the weight of acid tailings in vanadium extraction, hard coal and iron powder is: 90 ~ 93:7.5 ~ 8.5:0.5 ~ 1;
B, mixing raw material is put into pressing device be pressed into roasting sample;
C, roasting sample is put into the vertical stoving oven with nitrogen protection atmosphere carry out high temperature modified direct-reduction, obtain after reduction going back raw sample;
D, reduction sample ground obtain grinding sample, sample magnetic separation will be ground and obtain metallic iron.
2. reduction according to claim 1 extract the method for iron component in acid-leaching vanadium-extracted tailings, it is characterized in that: acid tailings in vanadium extraction refers to the acid slag of vanadium slag grog after sulfuric acid leaching after vanadium slag calcification baking, its iron oxide content between 32-40%, TV content is less than 1%.
3. reduction according to claim 2 extract the method for iron component in acid-leaching vanadium-extracted tailings, it is characterized in that: in step B, mixing raw material is suppressed under 40MPa pressure condition, and roasting sample is cylindrical, the diameter of roasting sample is 3cm, is highly 0.3cm.
4. reduction according to claim 3 extract the method for iron component in acid-leaching vanadium-extracted tailings, it is characterized in that: in step C, the processing parameter of high temperature modified direct-reduction is: reduction temperature is 1150 DEG C, and the recovery time is 1.5 hours, nitrogen flow is 2L/min, and nitrogen gas purity is greater than 99%.
5. reduction according to claim 4 extract the method for iron component in acid-leaching vanadium-extracted tailings, it is characterized in that: in step D, ore milling concentration is 60% ~ 70%; Granularity is the sample accounting that grinds being less than 0.074mm is 85 ~ 90%; Grind sample and carry out magnetic separation under magneticstrength is 70kA/m condition.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112649A (en) * | 2015-09-06 | 2015-12-02 | 北京神雾环境能源科技集团股份有限公司 | Method for preparing ferrochrome |
| CN105132674A (en) * | 2015-09-06 | 2015-12-09 | 北京神雾环境能源科技集团股份有限公司 | Ferrochrome preparation method |
| CN106756070A (en) * | 2017-03-24 | 2017-05-31 | 江苏省冶金设计院有限公司 | Process the method and system of vanadium-bearing slag of high calcium and high phosphor |
-
2015
- 2015-04-29 CN CN201510213515.4A patent/CN104762432A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112649A (en) * | 2015-09-06 | 2015-12-02 | 北京神雾环境能源科技集团股份有限公司 | Method for preparing ferrochrome |
| CN105132674A (en) * | 2015-09-06 | 2015-12-09 | 北京神雾环境能源科技集团股份有限公司 | Ferrochrome preparation method |
| CN105132674B (en) * | 2015-09-06 | 2018-08-21 | 神雾科技集团股份有限公司 | The method for preparing ferrochrome |
| CN106756070A (en) * | 2017-03-24 | 2017-05-31 | 江苏省冶金设计院有限公司 | Process the method and system of vanadium-bearing slag of high calcium and high phosphor |
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Application publication date: 20150708 |