CN102839250B - Method for collecting high-quality coal gas in process of producing reduced iron powder by means of microwave heating - Google Patents
Method for collecting high-quality coal gas in process of producing reduced iron powder by means of microwave heating Download PDFInfo
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Abstract
本发明提供一种在微波加热生产还原铁粉过程中同时收集优质煤气的方法，将含铁原料、木炭、煤粉碎；再进行分层布料：底层为煤或者木炭，为含铁原料质量的5～10%；中层为木炭和含铁原料的混合物，木炭的取量为含铁原料质量的11～17%；上层为煤，该层煤的取量为中层混合物质量的1～2%；将布好的物料置于微波反应器内加热至1000～1200℃，保温5～60min，期间收集尾气，即得到优质煤气。通过独特的底层布料和微波加热，能生产还原铁粉的同时生产优质煤气。生产周期短、产品质量均匀，实现了对资源的综合及高效利用，达到了废水、废气、废渣零排放的生产目标。产出的优质煤气中可燃气体的体积分数为91～95%，其中：CO占80～86%、H2占8～11%。The invention provides a method for collecting high-quality gas simultaneously in the process of producing reduced iron powder by microwave heating, crushing iron-containing raw materials, charcoal, and coal; ~10%; the middle layer is a mixture of charcoal and iron-containing raw materials, the amount of charcoal is 11-17% of the mass of iron-containing raw materials; the upper layer is coal, and the amount of coal in this layer is 1-2% of the mass of the middle layer mixture; The prepared materials are placed in a microwave reactor and heated to 1000-1200°C, and kept warm for 5-60 minutes, during which tail gas is collected to obtain high-quality gas. Through the unique bottom layer cloth and microwave heating, it can produce reduced iron powder and high-quality gas at the same time. The production cycle is short, the product quality is uniform, the comprehensive and efficient utilization of resources has been realized, and the production target of zero discharge of waste water, waste gas and waste residue has been achieved. The volume fraction of combustible gas in the produced high-quality gas is 91-95%, of which: CO accounts for 80-86%, and H 2 accounts for 8-11%.
Description
Technical field
The present invention relates to a kind of method of simultaneously collecting high-quality coal gas in microwave heating production reduced iron powder process, belong to microwave metallurgical and technical field of coal chemical industry.
Background technology
The tradition production of direct-reduced iron or the gas making of coal plant, its object is single, low to the overall availability of resource.Microwave heating to ferrous material have volumetric heating, rate of heating fast, can immediately supply/stop that heat, heating efficiency are high, pollution-free and auxiliary facility such as lacks at the advantage to product; In industrial production, microwave heating is being widely used and (can tracing back to the earliest 1962 to be dried as the middle low temperature field of representative, US19620225218), and very wide in the applied research in pyrometallurgy field, but be applied to industrial microwave high-temperature metallurgy yet in the exploratory stage.
The main technique of producing at present reduced iron powder is complete outer Hogonas method of joining reductive agent: the ring-type being formed by three layers of material, and middle layer is ferriferous oxide powder, inside/outside ring is all coal dust.The principal feature of this method is the indirect reduction that is reduced to of ferriferous oxide, CO in tail gas
2content is high, and recycle value is low.
Summary of the invention
The object of the invention is to solve quality how to improve tail gas in microwave heating industrial production reduced iron powder process, provide a kind of and produce the method for simultaneously collecting high-quality coal gas in reduced iron powder process in microwave heating, to realize the efficient collection of tail gas and the production cycle of shortening reduced iron powder.
The present invention realizes by following technical proposal: a kind of method of simultaneously collecting high-quality coal gas in microwave heating production reduced iron powder process, and the following each step of process:
(1) raw material is prepared: by iron-bearing material, charcoal, coal pulverizer to 100～200 order;
(2) cloth: standby step (1) institute material is carried out to layer-by-layer distribution: bottom is coal or charcoal, is 5～10% of iron-bearing material quality; Middle level is the mixture of charcoal and iron-bearing material, and the taken amount of charcoal is 11～17% of iron-bearing material quality; Upper strata is coal, and the taken amount of this layer of coal is 1～2% of middle level mixture quality;
(3) heating: the good material of step (2) cloth is placed in microwave reactor and is heated to 1000～1200 DEG C, and insulation 5～60min, collects tail gas during this time, obtains high-quality coal gas.
Described iron-bearing material is powdered iron concentrate or iron scale, its T
fe(full iron)>=71%.
Volatile matter >=21% of described coal and charcoal.
Furnace charge after gained reduction carries out cooling, pulverizes, and screening, wet magnetic separation, is drying to obtain a reduced iron powder (T of high-quality
fe=98～99%).
The advantage that the present invention possesses and effect: by unique ply stratum and microwave heating, production high-quality coal gas when can producing reduced iron powder.With short production cycle, uniform in quality, realized comprehensively and efficiently the utilizing of resource, and reached the productive target of waste water,waste gas and industrial residue zero release.In the high-quality coal gas of output, the volume fraction of inflammable gas is 91～95%, wherein: CO accounts for 80～86%, H
2account for 8～11%.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
Embodiment 1
(1) raw material is prepared: by powdery iron scale (T
fe>=71%), coal pulverizer to 150 order of the charcoal of volatile matter>=21%, volatile matter>=21%;
(2) cloth: standby step (1) institute material is carried out to layer-by-layer distribution: bottom is coal, is 10% of iron-bearing material quality; Middle level is the mixture of charcoal and iron-bearing material, and the taken amount of charcoal is 15% of iron-bearing material quality; Upper strata is coal, and the taken amount of this layer of coal is 1% of middle level mixture quality;
(3) heating: the good material of step (2) cloth is placed in microwave reactor and is heated to 1000 DEG C, and insulation 60min, collects tail gas during this time, (volume fraction of inflammable gas is 94.443%, wherein: CO accounts for 83.142%, H to obtain high-quality coal gas
2account for 10.31%, CH
4account for 0.991%, CO
2account for 5.556%.）。
Furnace charge after gained reduction carries out cooling, pulverizes, and screening, wet magnetic separation, is drying to obtain a reduced iron powder (T of high-quality
fe=98.99%).
Embodiment 2
(1) raw material is prepared: by powdery iron scale (T
febe 74%), volatilization is divided into 25% charcoal, volatilization is divided into 26% coal pulverizer to 100 order;
(2) cloth: standby step (1) institute material is carried out to layer-by-layer distribution: bottom is charcoal, is 8% of iron-bearing material quality; Middle level is the mixture of charcoal and iron-bearing material, and the taken amount of charcoal is 11% of iron-bearing material quality; Upper strata is coal, and the taken amount of this layer of coal is 2% of middle level mixture quality;
(3) heating: the good material of step (2) cloth is placed in microwave reactor and is heated to 1100 DEG C, and insulation 40min, collects tail gas during this time, (volume fraction of inflammable gas is 94.353%, wherein: CO accounts for 83.637%, H to obtain high-quality coal gas
2account for 9.722%, CH
4account for 0.994%, CO
2account for 5.532%.）。
Furnace charge after gained reduction carries out cooling, pulverizes, and screening, wet magnetic separation, is drying to obtain a reduced iron powder (T of high-quality
fe=98.47%).
Embodiment 3
(1) raw material is prepared: by powdery iron scale (T
febe 74%), volatilization is divided into 25% charcoal, volatilization is divided into 26% coal pulverizer to 200 order;
(2) cloth: standby step (1) institute material is carried out to layer-by-layer distribution: bottom is coal, is 5% of iron-bearing material quality; Middle level is the mixture of charcoal and iron-bearing material, and the taken amount of charcoal is 17% of iron-bearing material quality; Upper strata is coal, and the taken amount of this layer of coal is 1.5% of middle level mixture quality;
(3) heating: the good material of step (2) cloth is placed in microwave reactor and is heated to 1200 DEG C, and insulation 5min, collects tail gas during this time, (volume fraction of inflammable gas is 94.514%, wherein: CO accounts for 82.985%, H to obtain high-quality coal gas
2account for 10.551%, CH
4account for 0.978%, CO
2account for 5.479%.）。
Furnace charge after gained reduction carries out cooling, pulverizes, and screening, wet magnetic separation, is drying to obtain a reduced iron powder (T of high-quality
fe=98.94%).
Claims (2)
1. produce a method of simultaneously collecting high-quality coal gas in reduced iron powder process in microwave heating, it is characterized in that through following each step:
(1) by iron-bearing material, charcoal, coal pulverizer to 100～200 order;
(2) standby step (1) institute material is carried out to layer-by-layer distribution: bottom is coal or charcoal, is 5～10% of iron-bearing material quality; Middle level is the mixture of charcoal and iron-bearing material, and the taken amount of charcoal is 11～17% of iron-bearing material quality; Upper strata is coal, and the taken amount of this layer of coal is 1～2% of middle level mixture quality, wherein, and volatile matter >=21% of coal and charcoal;
(3) the good material of step (2) cloth is placed in microwave reactor and is heated to 1000～1200 DEG C, insulation 5～60min, collects tail gas during this time, obtains high-quality coal gas.
2. method of simultaneously collecting high-quality coal gas in microwave heating production reduced iron powder process according to claim 1, is characterized in that: described iron-bearing material is powdered iron concentrate or iron scale, its T
fe(full iron)>=71%.
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| CN103962568B (en) * | 2014-04-15 | 2016-06-22 | 昆明理工大学 | A kind of method of microwave heating preparation reduction chromium powder |
| CN108148938B (en) * | 2017-11-28 | 2019-07-26 | 辽宁科技大学 | A method for preparing high-purity iron powder by direct reduction of iron scale by multi-gradient vacuum method under microwave external field |
| CN108048612B (en) * | 2017-11-28 | 2019-08-20 | 辽宁科技大学 | A method for preparing high-purity sponge iron by using renewable energy to reduce iron scale under microwave |
| CN115747400B (en) * | 2022-11-28 | 2024-03-12 | 李扬 | Method for producing high-end sponge iron powder from fine iron powder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676252A (en) * | 2005-04-25 | 2005-10-05 | 昆明理工大学 | Method for preparing natural micro-alloyed iron powder by microwave irradiation of vanadium-titanium iron concentrate |
| CN1724695A (en) * | 2005-05-10 | 2006-01-25 | 太原理工大学 | Method for preparing low-carbon sponge iron with microwave shaft furnace |
| CN1733943A (en) * | 2004-08-10 | 2006-02-15 | 孔凡逸 | Method and device for manufacturing reduced iron using microwave fluid bed |
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| FR2850520B1 (en) * | 2003-01-24 | 2006-09-15 | Entema | MICROWAVE RADIATION HEATING DEVICE AND METHOD FOR IMPLEMENTING THE SAME |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733943A (en) * | 2004-08-10 | 2006-02-15 | 孔凡逸 | Method and device for manufacturing reduced iron using microwave fluid bed |
| CN1676252A (en) * | 2005-04-25 | 2005-10-05 | 昆明理工大学 | Method for preparing natural micro-alloyed iron powder by microwave irradiation of vanadium-titanium iron concentrate |
| CN1724695A (en) * | 2005-05-10 | 2006-01-25 | 太原理工大学 | Method for preparing low-carbon sponge iron with microwave shaft furnace |
Non-Patent Citations (2)
| Title |
|---|
| 微波辐射钒钛磁铁精矿制备铁粉新工艺研究;杨卜等;《中国工程科学》;20050930;第7卷;361-363 * |
| 杨卜等.微波辐射钒钛磁铁精矿制备铁粉新工艺研究.《中国工程科学》.2005,第7卷361-363. |
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