CN103589857A - Full utilization method for middle and low-grade pyrite - Google Patents
Full utilization method for middle and low-grade pyrite Download PDFInfo
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- CN103589857A CN103589857A CN201310543398.9A CN201310543398A CN103589857A CN 103589857 A CN103589857 A CN 103589857A CN 201310543398 A CN201310543398 A CN 201310543398A CN 103589857 A CN103589857 A CN 103589857A
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- pyrite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a full utilization method for middle and low-grade pyrite. The method comprises the following steps: (1) after full-thickness pyrite is exploited, controlling the moisture of the pyrite to be 2-3%, crushing, and grinding the pyrite until the fineness is 50-70 meshes to obtain pyrite powder; (2) adding the crushed pyrite powder to a fluidized bed furnace for roasting to obtain sulfur dioxide gas and slag; (3) preparing sulfuric acid or sulfur by the sulfur dioxide gas; (4) conducting magnetic separation on the slag to obtain fine iron power and waste residue, wherein the total sulfur content of the fine iron power is 0.5-0.7%, directly using the fine iron power as a steel making raw material, and using the waste residue as an admixture for cement concrete. The full utilization method takes full use of the middle and low-grade pyrite, solves the pollution problem of tailings and beneficiation wastewater during the acid preparing process by pyrite, meanwhile improves the burn-out rate of the pyrite, achieves the purpose of low sulfur content of the slag, and provides a powerful guarantee for further utilizing the slag.
Description
Technical field
The present invention relates to the method for low grade pyrite relieving haperacidity in a kind of full use.
Background technology
Sulfurous iron ore is the topmost sulphur resource of China, main as producing sulfuric acid.China's ferro-sulphur ore enriches 10% of ，Zhan world total reserves, occupies the 3rd, but mainly with in low-grade be main.At present, after low-grade sulfurous iron ore exploitation,, first through fragmentation, gravity treatment or flotation, make after the sulphur concentrate of sulfur-bearing 35-48%, then enter stove roasting extracting sulfuric acid with this sulphur concentrate.It is exactly in sulphur Concentrate process, can produce a large amount of mine tailing and beneficiation wastewater not processed that this acid preparation method exists a maximum shortcoming, not only wasted valuable Mineral resources, and beneficiation wastewater has also caused severe contamination to environment.
Chinese patent CN101457290 B discloses a kind of method of middle low grade pyrite comprehensive utilization, and it is that sulfurous iron ore holostrome is exploited out, directly enters boiling roaster after fragmentation, obtains sulfur dioxide gas and slag.Sulfur dioxide gas is for extracting sulfuric acid or sulphur, slag magnetic separation iron fine powder or directly need to add corresponding ore composition according to subsequent product.Although the method has solved the problem of the waste of mine tailing in sulphur Concentrate process and contaminated wastewater, after but sulfurous iron ore is exploited out, to be crushed to 4mm to carry out below roasting, the particle ore deposit roasting method adopting, burning yield is lower, slag sulfur-bearing is higher, and (effectively sulphur is 0.5-1%, full sulphur is 1-2%), the full sulphur of iron fine powder obtaining by magnetic separation is 1.5% left and right, can not be directly as the raw material (Steel Plant are that full sulphur is less than or equal to 0.9% to the requirement of iron fine powder) of Steel Plant, ore deposit must be joined with low-sulfur iron fine powder in use by Steel Plant, purchasing of raw materials cost and the equipment investment cost of Steel Plant have been increased, economic input strengthens.
Summary of the invention
Object of the present invention is just for the deficiencies in the prior art, the method of low grade pyrite in a kind of full use is provided, low-grade sulfurous iron ore raw ore complete utilization in its handle, mine tailing in pyrite-based sulfuric acid production process and the pollution problem of beneficiation wastewater have been solved, improved the burning yield of sulfurous iron ore simultaneously, reach the object of the low sulfur-bearing of slag, for the further utilization of slag provides powerful guarantee.
To achieve these goals, the technical solution used in the present invention is such: a kind of middle low grade pyrite complete utilization method, comprising the following steps: (1) sulfurous iron ore holostrome is controlled its moisture to 2-3% after exploiting out, is 50-70 order by sulfurous iron ore crushing and grinding to fineness, obtains troilite powder; (2) troilite powder after fragmentation enters boiling roaster, obtains sulfur dioxide gas and slag; (3) sulfur dioxide gas is for extracting sulfuric acid or sulphur; (4) slag magnetic separation obtains iron fine powder and waste residue, and in iron fine powder, total sulphur content is 0.5-0.7%, and directly as steelmaking feed, waste residue is for the adulterant of cement concrete.
Preferably, with the waste heat that step (3) is produced sulfuric acid, carrying out sulfurous iron ore to the moisture in baking step (1) is 2-3%, plays resource circulation utilization, energy-saving and cost-reducing object.
Further, the broken fineness of described step (1) sulfurous iron ore is 60 orders, and the burning yield of sulfurous iron ore is best.
The broken sulfurous iron ore of preferred spheres grinding machine, the ore powder granularity obtaining is even.
Compared with prior art, the present invention changes sulfurous iron ore particle roasting in prior art into fine ore roasting, by sulfurous iron ore crushing and grinding to fineness, it is 50-70 object breeze, breeze roasting has improved the burning yield of sulfurous iron ore, thereby reduce the sulphur content of slag, make the full sulfur content of the iron fine powder that its magnetic separation obtains lower than the sulphur content of Steel Plant's steelmaking feed regulation, the raw material that can directly make steel as Steel Plant, reduce equipment purchase and the technical process of Steel Plant, greatly alleviated the economical load of Steel Plant.Ore powder granularity, between 50-70 order, not only can guarantee high burning yield simultaneously, also can avoid the meticulous formation of powder to pile up, and stops up production system pipeline, brings unnecessary maintenance of equipment, reduces production efficiency.The moisture that the present invention simultaneously controls raw ore, at 2-3%, has been controlled the lower moisture that enters stove roasting, has solved the thermal balance question of roasting, energy-saving and cost-reducing.And waste heat that utilize to produce sulfuric acid is dried raw ore, recycle, energy-saving and cost-reducing object have further been played.
Mine tailing and waste water that the inventive method does not have sulphur concentrate to produce, the waste of prior art Mineral Resource and problem of environmental pollution have been solved, in middle low grade pyrite, all the components of symbiosis is all fully used, and is a kind of method that middle low grade pyrite complete utilization well economizes on resources that is suitable for.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inventive method.
Embodiment
In order more clearly to understand object of the present invention, technical scheme and beneficial effect, below the present invention is described further, but protection scope of the present invention is not limited in following examples.
The present invention adopts breeze sinter process.
Embodiment 1: adopt the sulfurous iron ore of Luzhou City Xuyong County, Sichuan Province, raw ore sulphur content is 15-18%, and water content is below 3%.Raw ore, directly into ball mill, is adjusted to fan delivery, the ore powder granularity grinding is controlled to 50 order effects, breeze is transported to fluidizing furnace finished product bin.By custody transfer mechanism, the breeze in feed bin is delivered in the fluidizing furnace in state of combustion continuously, controlling furnace bottom pressure is 10-12KPa, and furnace temperature is 750-850 ℃, and water colour is controlled as brownish black.The sulfur dioxide gas producing arrives follow-up workshop section pyrite-based sulfuric acid production explained hereafter sulfuric acid routinely.From cinder notch, boiler, tornado dust collector and electric precipitator etc. under fluidizing furnace, collect slag.Slag, through magnetic separation, obtains desulfurization iron fine powder and waste residue, and by analysis, this iron fine powder iron content 60.8%, sulfur-bearing (full sulphur) 0.7%, can be directly used in Steel Plant's steelmaking feed.Waste residue iron content 6.1% after magnetic separation, aluminum oxide 37.5%, silicon-dioxide 32.2%, can be used as the adulterant of producing cement and commerical ready-mixed concrete.
Embodiment 2: adopt the sulfurous iron ore of Yibin City Xingwen County, Sichuan Province, raw ore sulphur content is 15-18%, and water content is 5% left and right.First raw ore is dried to moisture be 2%-3%, wherein dry the waste heat that origin of heat produces in extracting sulfuric acid.Again the raw ore after drying is entered to ball mill, adjust fan delivery, the ore powder granularity grinding is controlled to 60 order effects, breeze is transported to fluidizing furnace finished product bin.By custody transfer mechanism, the breeze in feed bin is delivered in the fluidizing furnace in state of combustion continuously, controlling furnace bottom pressure is 10-12KPa, and furnace temperature is 750-850 ℃, and water colour is controlled as brownish black.The sulfur dioxide gas producing arrives follow-up workshop section pyrite-based sulfuric acid production explained hereafter sulfuric acid routinely.From cinder notch, boiler, tornado dust collector and electric precipitator etc. under fluidizing furnace, collect slag.Slag, through magnetic separation, obtains desulfurization iron fine powder and waste residue, and by analysis, this iron fine powder iron content 60.2%, sulfur-bearing (full sulphur) 0.6%, can be directly used in Steel Plant's steelmaking feed.Waste residue iron content 5.5% after magnetic separation, aluminum oxide 35.1%, silicon-dioxide 33.6%, can be used as the adulterant of producing cement and commerical ready-mixed concrete.
Embodiment 3: adopt the sulfurous iron ore of Dafang County, Guizhou Province, raw ore sulphur content is 17-20%, and water content is below 3%.Raw ore, directly into ball mill, is adjusted to fan delivery, the ore powder granularity grinding is controlled to 70 order effects, breeze is transported to fluidizing furnace finished product bin.By custody transfer mechanism, the breeze in feed bin is delivered in the fluidizing furnace in state of combustion continuously, controlling furnace bottom pressure is 10-12KPa, and furnace temperature is 750-850 ℃, and water colour is controlled as brownish black.The sulfur dioxide gas producing arrives follow-up workshop section pyrite-based sulfuric acid production explained hereafter sulfuric acid routinely.From cinder notch, boiler, tornado dust collector and electric precipitator etc. under fluidizing furnace, collect slag.Slag, through magnetic separation, obtains desulfurization iron fine powder and waste residue, and by analysis, this iron fine powder iron content 61.4%, sulfur-bearing (full sulphur) 0.7%, can be directly used in Steel Plant's steelmaking feed.Waste residue iron content 6.3% after magnetic separation, aluminum oxide 38.9%, silicon-dioxide 30.7%, can be used as the adulterant of producing cement and commerical ready-mixed concrete.
Comparative example: adopt particle sinter process.The sulfurous iron ore that adopts Luzhou City Xuyong County, Sichuan Province, raw ore sulphur content is 15-18%, water content is below 3%.
Raw ore is crushed to 4mm and to be lowered to fluidizing furnace, at the temperature of 850-950 ℃, carries out fluidized bed roasting, obtain sulfur dioxide gas and slag.By analysis, in this slag, sulfur-bearing (full sulphur) is 1.8%.Slag obtains iron fine powder through magnetic separation, and this iron fine powder sulfur-bearing (full sulphur) is 1.5%, can not be directly as the raw material of Steel Plant, and ore deposit must be joined with low-sulfur iron fine powder in use by Steel Plant.
Claims (4)
1. a low grade pyrite complete utilization method in, is characterized in that: comprise the following steps:
(1) after exploiting out, to control its moisture be 2-3% to sulfurous iron ore holostrome, by its crushing and grinding to fineness, is 50-70 order, obtains troilite powder;
(2) troilite powder enters boiling roaster, obtains sulfur dioxide gas and slag;
(3) sulfur dioxide gas is for extracting sulfuric acid or sulphur;
(4) slag magnetic separation obtains iron fine powder and waste residue, and in iron fine powder, total sulphur content is 0.5-0.7%, and directly as steelmaking feed, waste residue is for the adulterant of cement concrete.
2. a kind of middle low grade pyrite complete utilization method according to claim 1, is characterized in that: with the waste heat that step (3) is produced sulfuric acid, carrying out sulfurous iron ore to the moisture in baking step (1) is 2-3%.
3. a kind of middle low grade pyrite complete utilization method according to claim 1, is characterized in that: the broken fineness of described step (1) sulfurous iron ore is 60 orders.
4. according to a kind of middle low grade pyrite complete utilization method described in claim 1 or 3, it is characterized in that: the disintegrating apparatus of described step (1) is ball mill.
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| CN201310543398.9A CN103589857A (en) | 2013-11-06 | 2013-11-06 | Full utilization method for middle and low-grade pyrite |
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| CN201310543398.9A CN103589857A (en) | 2013-11-06 | 2013-11-06 | Full utilization method for middle and low-grade pyrite |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105502305A (en) * | 2015-12-30 | 2016-04-20 | 贵州省大方润丰化工有限公司 | Pyrite low-oxygen roasting method for increasing proportion of Fe3O4 in total iron of roasted residues |
| CN105543470A (en) * | 2015-12-30 | 2016-05-04 | 贵州省大方润丰化工有限公司 | Method for efficiently extracting iron from iron pyrite roasting slag |
| CN106006570A (en) * | 2016-05-25 | 2016-10-12 | 刘松 | Comprehensive utilization method of pyrite concentrate and high-sulfur coal |
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| CN101054166A (en) * | 2007-04-11 | 2007-10-17 | 张跃 | Method of producing sulfur from low-grade pyrites by two-section fluid bed |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105502305A (en) * | 2015-12-30 | 2016-04-20 | 贵州省大方润丰化工有限公司 | Pyrite low-oxygen roasting method for increasing proportion of Fe3O4 in total iron of roasted residues |
| CN105543470A (en) * | 2015-12-30 | 2016-05-04 | 贵州省大方润丰化工有限公司 | Method for efficiently extracting iron from iron pyrite roasting slag |
| CN106006570A (en) * | 2016-05-25 | 2016-10-12 | 刘松 | Comprehensive utilization method of pyrite concentrate and high-sulfur coal |
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Application publication date: 20140219 |