CN105502305A - Pyrite low-oxygen roasting method for increasing proportion of Fe3O4 in total iron of roasted residues - Google Patents

Pyrite low-oxygen roasting method for increasing proportion of Fe3O4 in total iron of roasted residues Download PDF

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Publication number
CN105502305A
CN105502305A CN201511009564.2A CN201511009564A CN105502305A CN 105502305 A CN105502305 A CN 105502305A CN 201511009564 A CN201511009564 A CN 201511009564A CN 105502305 A CN105502305 A CN 105502305A
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CN
China
Prior art keywords
pyrite
slag
furnace
roasting method
oxygen
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.)
Pending
Application number
CN201511009564.2A
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Chinese (zh)
Inventor
周强
吴忠树
兰焕平
骆奎
陈仕华
彭名奇
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Guizhou Dafang Runfeng Chemical Co Ltd
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Guizhou Dafang Runfeng Chemical Co Ltd
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Publication date
Application filed by Guizhou Dafang Runfeng Chemical Co Ltd filed Critical Guizhou Dafang Runfeng Chemical Co Ltd
Priority to CN201511009564.2A priority Critical patent/CN105502305A/en
Publication of CN105502305A publication Critical patent/CN105502305A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/48—Sulfur dioxide; Sulfurous acid
    • C01B17/50—Preparation of sulfur dioxide
    • C01B17/52—Preparation of sulfur dioxide by roasting sulfides
    • 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
    • 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
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Abstract

The invention discloses a pyrite low-oxygen roasting method for increasing a proportion of Fe3O4 in total iron of roasted residues. The pyrite low-oxygen roasting method comprises the following steps that when entering a fluidized-bed furnace, the sulfur content of pyrite is 34 to 38 percent, moisture is below 4 percent, furnace temperature is at 930 to 980 DEG C, and oxygen content of furnace gas is controlled to be 0.14 to 0.16 percent; a large part of roasted residues overflows from a cinder notch of the fluidized-bed furnace, and a small part of roasted residues is taken away by the furnace gas and is discharged respectively from a waste heat boiler, a cyclone dust collector and an electrostatic dust collector; the roasted residues are piled after being sprayed with water and cooled. According to the pyrite low-oxygen roasting method disclosed by the invention, the roasted residues can meet the magnetic separation requirement, and meets magnetic separation of a sulfuric acid system.

Description

A kind of raising Fe 3o 4the weak oxygen roasting method of the sulfurous iron ore of ratio in the total iron of slag
Technical field
The present invention relates to chemical technology field, relate in particular to a kind of raising Fe 3o 4the weak oxygen roasting method of the sulfurous iron ore of ratio in the total iron of slag.
Background technology
Sulfurous iron ore major ingredient is FeS 2, be commonly called as pyrite, after the washing enrichment of dressing-works, sulphur content reaches about 35%, iron level about 30%, and other mineral substance has CaCO 3, AL 2o 3deng and the trace element such as As, Pb, Zn, P, Cu, SiO in sulfurous iron ore component 2and AL 2o 3deng the reaction not participating in sulphur, iron in roasting relieving haperacidity, other As, Pb, Zn equal size is atomic, all can remain in slag, meets Iron concentrate specification of quality.
Production of sulfur from pyrite technic acid first link is that SO is produced in roasting 2, the chemical equation of oxidizing roasting is:
4FeS 2+110 2→2Fe 2O 3+8SO 2↑+Q
Pyrite burning slag is the Fe after pyrite burning 2o 3with CaO, AL 2o 3deng mixture, Fe content can only reach about 40%, and major ingredient nonmagnetic be Fe 2o 3, Fe can not magnetic concentration, so, weak oxygen magnetic sinter process must be adopted, to make in slag Fe with Fe 3o 4form exists, and could reach iron concentrate grade requirement to make the raw material of steel mill by enriched iron content.
Weak oxygen magnetic roasting chemical equation is:
3FeS 2+8O 2→Fe 3O 4+6SO 2↑+Q
The oxygen sulphur ratio of two kinds of sinter processs, oxidizing roasting is 1.375, and magnetic roasting is 1.333, oxidizing roasting only many oxygen consumptions 3.1% in theory, show under sulfate system normal production conditions, the processing condition of weak oxygen magnetic roasting are in a corresponding narrow scope, and operating restraint is quite limited.Adopt weak oxygen sinter process, not only will control Fe 3o 4content, and to have a direct impact the temperature of fluidizing furnace, during oxygen level wretched insufficiency, burn insufficient, furnace temperature reduces, sweetening effectiveness is poor, not only cause the waste of sulphur, also have a strong impact on Iron concentrate quality.
Summary of the invention
The object of the invention is to overcome above-mentioned shortcoming and the one provided can make slag meet magnetic separation requirement, and meet the raising Fe of the normal operation of sulfate system 3o 4the weak oxygen roasting method of the sulfurous iron ore of ratio in the total iron of slag.
One of the present invention improves Fe 3o 4the weak oxygen roasting method of the sulfurous iron ore of ratio in the total iron of slag, comprises the following steps:
(1) roasting: sulfurous iron ore enters fluidizing furnace sulfur-bearing 34-38%, moisture less than 4%, furnace temperature, at 930-980 DEG C, controls furnace gas oxygen level at 0.14-0.16%;
(2) deslagging: fired slags major part is from the overflow of fluidizing furnace slag-drip opening, and small part is taken away by furnace gas and discharged from waste heat boiler, tornado dust collector, electrostatic precipitator respectively.
Above-mentioned one improves Fe 3o 4the weak oxygen roasting method of the sulfurous iron ore of ratio in the total iron of slag, wherein: store up after the cooling of fired slags Water spray.
The present invention compared with prior art, there is obvious beneficial effect, as can be known from the above technical solutions: sulfurous iron ore of the present invention enter stove sulfur-bearing 34-38%, moisture less than 4%, furnace temperature 930-980 DEG C, control furnace gas oxygen level at 0.14-0.16%, the slag overall target obtained is optimum, Fe 3o 4composition part reaches 90%, sulfur-bearing≤1.2% in the total iron of slag.In slag, Armco magnetic iron composition, the comprehensive content of residual sulphur meet iron concentrate grade requirement.Meet the normal operation of sulfate system completely, slag meets magnetic separation requirement; By secondary oxidation after high temperature furnace slag discharge, Fe is kept with Fe 3o 4form exists, and stores up after the cooling of slag Water spray.
Embodiment
embodiment 1:
A kind of raising Fe 3o 4the weak oxygen roasting method of the sulfurous iron ore of ratio in the total iron of slag, comprises the following steps:
(1) roasting: sulfurous iron ore enters fluidizing furnace sulfur-bearing 35%, moisture less than 4%, furnace temperature, at 950 DEG C, controls furnace gas oxygen level at 0.14-0.16%; In slag, Armco magnetic iron composition can reach 90%, and the comprehensive content of residual sulphur can be controlled in less than 1.2%, and meet the normal operation of sulfate system completely, slag meets magnetic separation requirement;
(2) deslagging: fired slags major part is from the overflow of fluidizing furnace slag-drip opening, and small part is taken away by furnace gas and discharged from waste heat boiler, tornado dust collector, electrostatic precipitator respectively.
Wherein: store up after the cooling of fired slags Water spray.
embodiment 2:
A kind of raising Fe 3o 4the weak oxygen roasting method of the sulfurous iron ore of ratio in the total iron of slag, comprises the following steps:
(1) roasting: sulfurous iron ore enters fluidizing furnace sulfur-bearing 34%, moisture less than 4%, furnace temperature, at 980 DEG C, controls furnace gas oxygen level at 0.14-0.16%; In slag, Armco magnetic iron composition can reach 90%, and the comprehensive content of residual sulphur can be controlled in less than 1.2%, and meet the normal operation of sulfate system completely, slag meets magnetic separation requirement;
(2) deslagging: fired slags major part is from the overflow of fluidizing furnace slag-drip opening, and small part is taken away by furnace gas and discharged from waste heat boiler, tornado dust collector, electrostatic precipitator respectively.
Wherein: store up after the cooling of fired slags Water spray.
embodiment 3:
A kind of raising Fe 3o 4the weak oxygen roasting method of the sulfurous iron ore of ratio in the total iron of slag, comprises the following steps:
(1) roasting: sulfurous iron ore enters fluidizing furnace sulfur-bearing 35%, sulfurous iron ore enters stove sulfur-bearing 38%, moisture less than 4%, and furnace temperature, at 930 DEG C, controls furnace gas oxygen level at 0.14-0.16%; In slag, Armco magnetic iron composition can reach 90%, and the comprehensive content of residual sulphur can be controlled in less than 1.2%, and meet the normal operation of sulfate system completely, slag meets magnetic separation requirement;
(2) deslagging: fired slags major part is from the overflow of fluidizing furnace slag-drip opening, and small part is taken away by furnace gas and discharged from waste heat boiler, tornado dust collector, electrostatic precipitator respectively.
Wherein: store up after the cooling of fired slags Water spray.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, anyly do not depart from technical solution of the present invention content, the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (2)

1. one kind is improved Fe 3o 4the weak oxygen roasting method of the sulfurous iron ore of ratio in the total iron of slag, comprises the following steps:
(1) roasting: sulfurous iron ore enters fluidizing furnace sulfur-bearing 34-38%, moisture less than 4%, furnace temperature, at 930-980 DEG C, controls furnace gas oxygen level at 0.14-0.16%;
(2) deslagging: fired slags major part is from the overflow of fluidizing furnace slag-drip opening, and small part is taken away by furnace gas and discharged from waste heat boiler, tornado dust collector, electrostatic precipitator respectively.
2. a kind of raising Fe as claimed in claim 1 3o 4the weak oxygen roasting method of the sulfurous iron ore of ratio in the total iron of slag, wherein: store up after the cooling of fired slags Water spray.
CN201511009564.2A 2015-12-30 2015-12-30 Pyrite low-oxygen roasting method for increasing proportion of Fe3O4 in total iron of roasted residues Pending CN105502305A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201511009564.2A CN105502305A (en) 2015-12-30 2015-12-30 Pyrite low-oxygen roasting method for increasing proportion of Fe3O4 in total iron of roasted residues

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201511009564.2A CN105502305A (en) 2015-12-30 2015-12-30 Pyrite low-oxygen roasting method for increasing proportion of Fe3O4 in total iron of roasted residues

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CN105502305A true CN105502305A (en) 2016-04-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110357044A (en) * 2019-06-26 2019-10-22 嘉施利（宜城）化肥有限公司 The pyrite concentrate of the black slag of by-product roasts acid preparation method
CN111876589A (en) * 2020-08-04 2020-11-03 东北大学 Method and device for desulfurization and reduction of sulfur-containing iron ore

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RO90744A2 (en) * 1985-01-23 1986-12-10 Institutul De Cercetare Inginerie Tehnologica Proiectare Si Productiepentru Industria Anorganica Si Metale Neferoase,Unitatea De Cercetaresi Proiectare Pentru Metalurgia Neferoasa,Ro PROCESS FOR PROCESSING OF PIRITED POLYMETAL CONCENTRATES
CN1772598A (en) * 2005-09-29 2006-05-17 赵恩举 New acid preparing process with pyrite ore
CN101457290A (en) * 2009-01-08 2009-06-17 云南常青树投资有限公司 Comprehensive utilization method of middle and low grade ferro-sulphur ore
CN103589857A (en) * 2013-11-06 2014-02-19 施可丰泸州化工有限公司 Full utilization method for middle and low-grade pyrite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RO90744A2 (en) * 1985-01-23 1986-12-10 Institutul De Cercetare Inginerie Tehnologica Proiectare Si Productiepentru Industria Anorganica Si Metale Neferoase,Unitatea De Cercetaresi Proiectare Pentru Metalurgia Neferoasa,Ro PROCESS FOR PROCESSING OF PIRITED POLYMETAL CONCENTRATES
CN1772598A (en) * 2005-09-29 2006-05-17 赵恩举 New acid preparing process with pyrite ore
CN101457290A (en) * 2009-01-08 2009-06-17 云南常青树投资有限公司 Comprehensive utilization method of middle and low grade ferro-sulphur ore
CN103589857A (en) * 2013-11-06 2014-02-19 施可丰泸州化工有限公司 Full utilization method for middle and low-grade pyrite

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
刘少武等: "《硫酸工作手册》", 30 April 2001 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110357044A (en) * 2019-06-26 2019-10-22 嘉施利（宜城）化肥有限公司 The pyrite concentrate of the black slag of by-product roasts acid preparation method
CN111876589A (en) * 2020-08-04 2020-11-03 东北大学 Method and device for desulfurization and reduction of sulfur-containing iron ore

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Application publication date: 20160420