CN101934375A - Method for purifying low-quality reduced iron powder - Google Patents
Method for purifying low-quality reduced iron powder Download PDFInfo
- Publication number
- CN101934375A CN101934375A CN 201010246798 CN201010246798A CN101934375A CN 101934375 A CN101934375 A CN 101934375A CN 201010246798 CN201010246798 CN 201010246798 CN 201010246798 A CN201010246798 A CN 201010246798A CN 101934375 A CN101934375 A CN 101934375A
- Authority
- CN
- China
- Prior art keywords
- iron powder
- reduced iron
- materials
- powder
- purification
- 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.)
- Granted
Links
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention relates to a method for purifying low-quality reduced iron powder, and belongs to the technical field of mineral process engineering. The method comprises the following steps of: adding water into scrap materials containing reduced iron powder, and performing stirring, dissolving and pretreatment for 5 to 60 minutes, wherein the concentration of the solution subjected to stirring, dissolving and pretreatment is 20 to 90 mass percent; removing impurities by using an electromagnetic classificator, wherein the current of the electromagnetic classificator is controlled to be between 0.5 and 2A, the speed of the water-supply flow is controlled to be between 5 and 30 centimeters/second, and the insoluble substance content of acid in the materials subjected to impurity removal is controlled to be less than 0.50 percent; dewatering and drying the materials subjected to the impurity removal at the temperature of between 100 and 300 DEG C, and taking the materials out when the moisture of the materials is between 5 and 10 percent; reducing the dewatered materials by introducing hydrogen at the reaction temperature of between 700 and 860 DEG C for 1 to 5 hours, so that the chemical indexes of the reduced iron powder are qualified; and crushing the reduced materials for grading to obtain -100-mesh products and -200-mesh products. By the method, the scrap materials which are stacked or processed in low cost by enterprises for producing the reduced iron powder and contain the reduced iron powder are purified to form superior reduced iron powder so as to improve the additional values of products and avoid resource waste.
Description
Technical field:
The present invention relates to a kind of method of purification that contains the low quality reduced iron powder, belong to the Mineral Processing Engineering technical field.
Background technology:
Adopt two stage reduction methods of tunnel cave solid carbon and band oven nitrogen atmosphere to produce reduced iron powder at present, technology is more attained perfect, and all production has realized automation.The technical process of producing reduction of iron ore is at first the iron ore concentrate and the solid reductant (pulverized limestone that coke or anchracite duff blending 10%-15% desulfurization are used) of purifying to be packed in the reduction vessel with mutual and unmixed laminar, is heated to 1150-1200 ℃ then in kiln.The product iron grade that the once reduction of process of passing through tunnel kiln obtains can arrive more than 97%, and acid non-soluble substance content is less than 0.5%.Also original product carries out magnetic separation through after the fragmentation, magnetic concentrate carries out the secondary hydrogen reduction, magnetic tailing is as waste disposal, magnetic concentrate in the production behind the hydrogen reducing can reach the qualified reduced iron powder of iron content more than 98.5%, generally between 70-95%, productive rate is about 10% of total output as the grade of the magnetic tailing of waste disposal.At present magnetic tailing is as waste disposal, and the mode that each tame reduced iron powder manufacturing enterprise handles this waste material is to store up or the cheap raw material that is treated to ironmaking, has formed the wasting of resources.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, propose a kind of method of purification of low quality reduced iron powder, make the waste material that produces in the production process after purifying, become the reduced iron powder of high-quality.
The method of purification of a kind of low quality reduced iron powder of the present invention, as shown in Figure 1, carry out according to following steps:
(1) at first add water in containing the waste material of reduced iron powder, resolve preliminary treatment under stirring condition, stirring and resolving pretreated material concentration is 20%-90% by mass percentage, and the time is 5-60 minute;
(2) above-mentioned pretreated material is taken off assorted with the electromagnetism refiner, the electric current of control electromagnetism refiner is 0.5-2A, the last water velocity 5-30 cel of electromagnetism refiner, and the material that takes off after assorted requires the content of sour insoluble matter less than 0.50%;
(3) material that takes off after mixing is dewatered, dry then, baking temperature is 100-300 ℃, is taking-up in 5%～10% o'clock at material moisture;
(4) the logical hydrogen of the material after the dehydration is carried out reduction reaction, reaction temperature is controlled to be 700-860 ℃, and the time is 1-5 hour, makes the chemical index of reduced iron powder qualified;
(5) material after the reduction is carried out broken classification and obtain-100 order products and-200 order products.
The one-time dedusting powder that the described waste material that contains reduced iron powder is a powder metallurgy factory, final dusting powder and other contain the waste material of 70-95% reduced iron powder.
The chemical index of described reduced iron powder is qualified be hydrogen loss less than 0.2%, carbon content is less than 0.1%.
Its iron grade of described product is greater than 98.5%, and acid non-soluble substance is less than 0.5%.
The advantage that the present invention compared with prior art has and the positive effect of generation are: reduced iron powder manufacturing enterprise is stored up or the cheap waste material of handling that contains reduced iron powder, become the reduced iron powder of high-quality after the purification, improve value-added content of product, avoided the wasting of resources.
Figure of description
Fig. 1 is the process chart of the method for purification of a kind of low quality reduced iron powder of the present invention.
The specific embodiment:
Below in conjunction with embodiment, the method for purification of a kind of low quality reduced iron powder of the present invention is made a detailed description.
Embodiment 1
With certain powder metallurgy factory all iron content be 89.56%, acid non-soluble substance is 3.68%, carbon content is that 2.03% one-time dedusting powder adds water, under stirring condition, resolve preliminary treatment, stirring and resolving pretreated material concentration is 20% by mass percentage, and the time is 5 minutes; Take off assorted with the electromagnetism refiner above-mentioned pretreated material, the electric current of control electromagnetism refiner is 0.5A, last water velocity 5 cels of electromagnetism refiner take off material all iron content after assorted and are 94.84%, acid non-soluble substance is 0.26%, carbon content is 0.28%; The material that takes off after mixing is dewatered, and dry then, baking temperature is 100 ℃, takes out less than 10% o'clock at material moisture; The logical hydrogen of material after the dehydration is carried out reduction reaction, reaction temperature is controlled to be 700 ℃, time is 5 hours, obtain all iron content and be 99.13%, acid non-soluble substance is 0.25%, carbon content is 0.01% reduced iron powder, the chemical index of this reduced iron powder is qualified, the material after the reduction is carried out broken classification obtain-100 order products and-200 order products.
Embodiment 2
With certain powder metallurgy factory all iron content be 71.38%, acid non-soluble substance is 12.21%, carbon content is that 10.18% final dusting powder adds water, under stirring condition, resolve preliminary treatment, stirring and resolving pretreated material concentration is 90% by mass percentage, and the time is 60 minutes; Take off assorted with the electromagnetism refiner above-mentioned pretreated material, the electric current of control electromagnetism refiner is 2A, last water velocity 30 cels of electromagnetism refiner take off material all iron content after assorted and are 92.15%, acid non-soluble substance is 0.4%, carbon content is 0.36%; The material that takes off after mixing is dewatered, and dry then, baking temperature is 300 ℃, takes out less than 8% o'clock at material moisture; The logical hydrogen of material after the dehydration is carried out reduction reaction, reaction temperature is controlled to be 860 ℃, time is 1 hour, obtain all iron content and be 98.85%, acid non-soluble substance is 0.41%, carbon content is 0.01% reduced iron powder, the chemical index of this reduced iron powder is qualified, the material after the reduction is carried out broken classification obtain-100 order products and-200 order products.
Embodiment 3
With certain powder art Metallurgical Factory all iron content be 81.02%, acid non-soluble substance is 7.65%, carbon content is that 4.35% final dusting powder adds water, under stirring condition, resolve preliminary treatment, stirring and resolving pretreated material concentration is 56% by mass percentage, and the time is 30 minutes; Take off assorted with the electromagnetism refiner above-mentioned pretreated material, the electric current of control electromagnetism refiner is 1.7A, last water velocity 20 cels of electromagnetism refiner take off material all iron content after assorted and are 93.65%, acid non-soluble substance is 0.38%, carbon content is 0.28%; The material that takes off after mixing is dewatered, and dry then, baking temperature is 200 ℃, takes out less than 5% o'clock at material moisture; The logical hydrogen of material after the dehydration is carried out reduction reaction, reaction temperature is controlled to be 800 ℃, time is 3 hours, obtain all iron content and be 99.05%, acid non-soluble substance is 0.27%, carbon content is 0.01% reduced iron powder, the chemical index of this reduced iron powder is qualified, the material after the reduction is carried out fragmentation divide.
Claims (4)
1. the method for purification of a low quality reduced iron powder is characterized in that carrying out according to following steps:
(1) at first add water in containing the waste material of reduced iron powder, resolve preliminary treatment under stirring condition, stirring and resolving pretreated material concentration is 20%-90% by mass percentage, and the time is 5-60 minute;
(2) above-mentioned pretreated material is taken off assorted with the electromagnetism refiner, the electric current of control electromagnetism refiner is 0.5-2A, the last water velocity 5-30 cel of electromagnetism refiner, and the material that takes off after assorted requires the content of sour insoluble matter less than 0.50%;
(3) material that takes off after mixing is dewatered, dry then, baking temperature is 100-300 ℃, is taking-up in 5%～10% o'clock at material moisture;
(4) the logical hydrogen of the material after the dehydration is carried out reduction reaction, reaction temperature is controlled to be 700-860 ℃, and the time is 1-5 hour, makes the chemical index of reduced iron powder qualified;
(5) material after the reduction is carried out broken classification and obtain-100 orders and-200 order products.
2. the method for purification of a kind of low quality reduced iron powder according to claim 1 is characterized in that the described waste material that contains reduced iron powder is that the one-time dedusting powder of powder metallurgy factory, final dusting powder and other contain the waste material of 70%-95% reduced iron powder.
3. according to the method for purification of the described a kind of low quality reduced iron powder of claim 1, it is characterized in that the chemical index of described reduced iron powder qualified for hydrogen loss less than 0.2%, carbon content is less than 0.1%.
4. the method for purification of a kind of low quality reduced iron powder according to claim 1 is characterized in that its iron grade of described product greater than 98.5%, and acid non-soluble substance is less than 0.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010246798XA CN101934375B (en) | 2010-08-06 | 2010-08-06 | Method for purifying low-quality reduced iron powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010246798XA CN101934375B (en) | 2010-08-06 | 2010-08-06 | Method for purifying low-quality reduced iron powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101934375A true CN101934375A (en) | 2011-01-05 |
| CN101934375B CN101934375B (en) | 2012-07-18 |
Family
ID=43388080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010246798XA Active CN101934375B (en) | 2010-08-06 | 2010-08-06 | Method for purifying low-quality reduced iron powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101934375B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407339A (en) * | 2011-12-05 | 2012-04-11 | 哈尔滨东盛金属材料有限公司 | Preparation method for low-carbon low-sulphur reduced iron powder |
| CN105817640A (en) * | 2016-03-28 | 2016-08-03 | 无锡市飞云球业有限公司 | Production process for manufacturing reduced iron powder with steel ball grinding iron cement |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559299A (en) * | 2008-04-16 | 2009-10-21 | 中冶宝钢技术服务有限公司 | Processing technology for recycle of metallurgical solid waste |
-
2010
- 2010-08-06 CN CN201010246798XA patent/CN101934375B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559299A (en) * | 2008-04-16 | 2009-10-21 | 中冶宝钢技术服务有限公司 | Processing technology for recycle of metallurgical solid waste |
Non-Patent Citations (2)
| Title |
|---|
| 《矿业工程》 20071231 钱强 炼铁渣用于制备还原铁粉的工艺研究 22-23、27 1-4 第27卷, 第6期 2 * |
| 《矿产综合利用》 20030630 杨大兵等 还原铁废粉作红柱石重介质分选的介质特性研究 33-36 1-4 , 第3期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407339A (en) * | 2011-12-05 | 2012-04-11 | 哈尔滨东盛金属材料有限公司 | Preparation method for low-carbon low-sulphur reduced iron powder |
| CN105817640A (en) * | 2016-03-28 | 2016-08-03 | 无锡市飞云球业有限公司 | Production process for manufacturing reduced iron powder with steel ball grinding iron cement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101934375B (en) | 2012-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110828926B (en) | Method for cooperatively recovering metal and graphite from anode and cathode materials of waste lithium ion battery | |
| CN104876250A (en) | Method for extraction of lithium and removal of aluminum by vitriolization of lepidolite | |
| CN104016385A (en) | Method for preparing magnesium sulfate and magnesium silico calcium sulfur fertilizer by utilizing alkylated waste sulfuric acid | |
| CN104004919B (en) | The environment-protective circulating recycling technique of waste residue in a kind of electrolytic manganese production | |
| CN102372306A (en) | Method for recycling concentrated slag of wasted acid from titanium white production | |
| CN102820468A (en) | Preparation process of cobaltosic oxide for continuous production of batteries | |
| CN112520790A (en) | Method for producing cobalt sulfate by using organic cobalt slag of zinc smelting plant | |
| CN104498734A (en) | Titanium recovery treatment method for titanium-bearing blast furnace slag based on vacuum carbothermal reduction | |
| CN104445431A (en) | Method for preparing high-purity iron oxide red from pyrites slag | |
| CN104550992A (en) | Processing and production method for secondarily reduced powder | |
| CN108246494A (en) | A kind of method for detaching iron in high ferro cyanidation tailings | |
| CN103866131A (en) | Method for recycling blast furnace fly ash containing zinc | |
| CN103966460A (en) | Roasting leaching treatment process for recovery of metal rubidium resources from copper sulfur tailings | |
| CN113373275A (en) | Internal recycling method for KR desulfurization slag steel plant | |
| KR102182845B1 (en) | METHOD OF THE Li2CO3 FROM Li2SO4 | |
| CN101934375B (en) | Method for purifying low-quality reduced iron powder | |
| CN110735032A (en) | vanadium-titanium-iron paragenetic ore treatment process | |
| CN101435020A (en) | Method for producing titanium-rich material from titanium ore concentrate | |
| CN110358909B (en) | Method for green and efficient utilization of carbon in high-carbon vanadium-containing stone coal and pre-enrichment of vanadium | |
| CN107745132A (en) | A kind of method that iron oxide red prepares high-purity iron powder | |
| CN102653403B (en) | Process method for preparing calcium carbide by recycling calcium carbide slag | |
| CN102340046B (en) | Method of recovering and treating edge scraps of cobalt-coated spherical nickel hydroxide | |
| CN104846201B (en) | Method for enriching rare earth and preparing iron with coal slime rich in rare earth in ash | |
| CN101880767A (en) | Process for reducing leached pyrolusite ore by iron powder | |
| CN114920299A (en) | Method for purifying manganese dioxide |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |