CN101054625A - Method forpreparing iron concentrate for making iron from phosphorus-containing oolitic hematite - Google Patents
Method forpreparing iron concentrate for making iron from phosphorus-containing oolitic hematite Download PDFInfo
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- CN101054625A CN101054625A CNA2007100348382A CN200710034838A CN101054625A CN 101054625 A CN101054625 A CN 101054625A CN A2007100348382 A CNA2007100348382 A CN A2007100348382A CN 200710034838 A CN200710034838 A CN 200710034838A CN 101054625 A CN101054625 A CN 101054625A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 51
- 239000012141 concentrate Substances 0.000 title claims abstract description 44
- 239000011019 hematite Substances 0.000 title claims abstract description 37
- 229910052595 hematite Inorganic materials 0.000 title claims abstract description 37
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910052698 phosphorus Inorganic materials 0.000 title abstract description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title abstract description 11
- 239000011574 phosphorus Substances 0.000 title abstract description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 12
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 5
- 238000001238 wet grinding Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 238000010790 dilution Methods 0.000 claims 2
- 239000012895 dilution Substances 0.000 claims 2
- 239000006185 dispersion Substances 0.000 claims 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims 2
- 238000013467 fragmentation Methods 0.000 claims 1
- 238000006062 fragmentation reaction Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 12
- 239000002270 dispersing agent Substances 0.000 abstract description 11
- 239000002245 particle Substances 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002386 leaching Methods 0.000 description 7
- 238000005188 flotation Methods 0.000 description 3
- 238000007885 magnetic separation Methods 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009830 intercalation Methods 0.000 description 2
- 230000002687 intercalation Effects 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229910052622 kaolinite Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241000605118 Thiobacillus Species 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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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Abstract
本发明公开了一种由含磷鲕状赤铁矿制备炼铁用铁精矿的方法。先将鲕状铁矿石破碎、湿磨至粒度小于0.074mm的赤铁矿占整个赤铁矿的质量百分比的40％～60％，调整矿浆质量百分比浓度至20％～30％，添加水玻璃作为分散剂，用量为0.5～1.0kg/t，充分搅拌，采用螺旋溜槽进行分选，所得精矿经再磨到粒度小于0.074mm粒级的占80％以上后，以水玻璃为分散剂，用量为0.2～0.5kg/t，搅拌分散均匀后，再采用摇床进行分选，所得铁精矿在常温下，采用0.5％～1.5％的稀硫酸溶液洗涤，洗涤时间5～15min，固液体分离后固体为铁精矿。采用本发明处理鲕状赤铁矿，能获得品位62％、P含量低于0.06％的铁精矿。本发明能充分、合理利用我国储量丰富的鲕状赤铁矿资源，具有所得铁精矿铁品位及回收率高、脱磷效果好，成本低等优点。
The invention discloses a method for preparing iron concentrate for ironmaking from phosphorus-containing oolitic hematite. First crush and wet-grind the oolitic iron ore until the hematite with a particle size of less than 0.074mm accounts for 40% to 60% of the mass percentage of the entire hematite, adjust the mass percentage concentration of the pulp to 20% to 30%, and add water glass As a dispersant, the dosage is 0.5-1.0kg/t, fully stirred, and sorted by a spiral chute. After the obtained concentrate is re-ground to a particle size of less than 0.074mm, accounting for more than 80%, water glass is used as a dispersant. The dosage is 0.2-0.5kg/t. After stirring and dispersing evenly, the shaker is used for separation. The obtained iron concentrate is washed with 0.5%-1.5% dilute sulfuric acid solution at room temperature for 5-15 minutes. The separated solid is iron ore concentrate. By adopting the invention to process oolitic hematite, iron concentrate with a grade of 62% and a P content lower than 0.06% can be obtained. The invention can fully and rationally utilize oolitic hematite resources with abundant reserves in my country, and has the advantages of high iron grade and recovery rate of the obtained iron concentrate, good dephosphorization effect, low cost and the like.
Description
技术领域technical field
本发明涉及一种由鲕状赤铁矿制备炼铁用铁精矿的方法，特别是涉及一种含磷较高的鲕状赤铁矿制备炼铁用铁精矿的方法。The invention relates to a method for preparing iron concentrate for ironmaking from oolitic hematite, in particular to a method for preparing iron concentrate for ironmaking from oolitic hematite with higher phosphorus content.
背景技术Background technique
我国鲕状赤铁矿矿石储量丰富，但是由于赤铁矿与石英、高岭石和胶磷矿等嵌连关系复杂，被公认的最难选的铁矿石类型之一，同时，该矿属于高磷铁矿石，分选后不能获得直接用于高炉炼铁用的合格铁精矿。因此，目前鲕状赤铁矿资源基本没有得到利用。my country's oolitic hematite ore reserves are abundant, but due to the complex intercalation relationship between hematite and quartz, kaolinite and collophosite, it is recognized as one of the most difficult iron ore types. At the same time, the ore belongs to high Phosphate ore, qualified iron ore concentrate that can be directly used for blast furnace ironmaking can not be obtained after sorting. Therefore, oolitic hematite resources are basically not utilized at present.
近年来，随着我国钢铁工业的高速发展，铁矿石供应日趋紧张，利用国内含磷鲕状赤铁矿资源制备炼铁用铁精矿的研究被提到日程上来，从已进行的研究情况来看，到目前为止，利用含磷鲕状赤铁矿石制备炼铁用铁精矿的研究工作主要有：反浮选工艺、选择性聚团-反浮选、高梯度磁选、超细磨-选择性絮凝(聚团)-弱磁选或浮选、细磨-重选-磁选、细磨-多种重选、直接还原法、酸浸、氯化焙烧-酸浸工艺等，但是，由于鲕状赤铁矿矿石中赤铁矿与石英、高岭石和胶磷矿等嵌连关系复杂，使得这些方法大多存在着所得铁精矿铁品位及回收率低、含磷高，工艺流程长、成本高等问题，虽然有学者采用硫杆菌对所得铁精矿进行了脱磷研究，但脱磷率仅达到42％左右。可以说，目前还未探索出可大规模工业应用的利用鲕状赤铁矿资源制备炼铁用铁精矿的有效方法。In recent years, with the rapid development of China's iron and steel industry, the supply of iron ore has become increasingly tight, and the research on using domestic phosphorus-containing oolitic hematite resources to prepare iron concentrates for ironmaking has been put on the agenda. From the research situation that has been carried out From the point of view, so far, the research work of using phosphorus-containing oolitic hematite ore to prepare iron concentrate for ironmaking mainly includes: reverse flotation process, selective agglomeration-reverse flotation, high gradient magnetic separation, ultra-fine Grinding-selective flocculation (agglomeration)-weak magnetic separation or flotation, fine grinding-gravity separation-magnetic separation, fine grinding-multiple gravity separation, direct reduction method, acid leaching, chlorination roasting-acid leaching process, etc., However, due to the complex intercalation relationship between hematite and quartz, kaolinite and collophosite in oolitic hematite ore, most of these methods have low iron grade and recovery rate of the obtained iron concentrate, high phosphorus content, and technical problems. Problems such as long process and high cost, although some scholars have used Thiobacillus to dephosphorize the obtained iron concentrate, the dephosphorization rate only reaches about 42%. It can be said that an effective method for preparing iron concentrate for ironmaking by using oolitic hematite resources that can be applied in large-scale industrial applications has not yet been explored.
为了合理、高效利用含磷鲕状赤铁矿资源制备炼铁用铁精矿，并为我国储量丰富的鲕状赤铁矿的开发利用提供新的技术支撑，特提出本发明。In order to rationally and efficiently utilize phosphorus-containing oolitic hematite resources to prepare iron concentrate for ironmaking, and to provide new technical support for the development and utilization of oolitic hematite with abundant reserves in my country, the present invention is proposed.
发明内容Contents of the invention
本发明所要解决技术问题是提供一种脱磷率高、所得铁精矿铁品位及回收率高、工艺流程短、成本低的由含磷鲕状赤铁矿制备炼铁用铁精矿的方法。The technical problem to be solved by the present invention is to provide a method for preparing iron concentrate for ironmaking from phosphorus-containing oolitic hematite with high dephosphorization rate, high iron grade and recovery rate of the obtained iron concentrate, short process flow and low cost .
为了解决上述技术问题，本发明提供的由含磷鲕状赤铁矿制备炼铁用铁精矿的方法，利用两段磨矿螺旋溜槽+摇床分选技术来处理鲕状赤铁矿，所得铁精矿再采用稀硫酸浸出脱磷，即可获得满足高炉冶炼要求的合格铁精矿，具体工艺过程是，先将鲕状铁矿石破碎、湿磨至粒度小于0.074mm的赤铁矿占整个赤铁矿的质量百分比的40％～60％，调整矿浆质量百分比浓度至20％～30％，添加水玻璃作为分散剂，用量为0.5～1.0kg/t，充分搅拌，采用螺旋溜槽进行分选，所得精矿经再磨到粒度小于0.074mm粒级的占80％以上后，以水玻璃为分散剂，用量为0.2～0.5kg/t，搅拌分散均匀后，再采用摇床进行分选，所得铁精矿在常温下，采用0.5％～1.5％的稀硫酸溶液洗涤，洗涤时间5～15min，固液体分离后固体为铁精矿。In order to solve the above-mentioned technical problems, the method for preparing iron concentrate for ironmaking from phosphorus-containing oolitic hematite provided by the present invention utilizes two-stage grinding spiral chute+shaking table separation technology to process oolitic hematite, and the obtained The iron concentrate is leached and dephosphorized by dilute sulfuric acid to obtain qualified iron concentrate that meets the requirements of blast furnace smelting. The mass percentage of the whole hematite is 40%-60%, adjust the mass percentage concentration of the pulp to 20%-30%, add water glass as a dispersant, the dosage is 0.5-1.0kg/t, fully stir, and use a spiral chute for separation After re-grinding the resulting concentrate until the particle size is less than 0.074mm, accounting for more than 80%, water glass is used as a dispersant, and the dosage is 0.2-0.5kg/t. After stirring and dispersing evenly, the shaker is used for separation. The obtained iron concentrate is washed with 0.5%-1.5% dilute sulfuric acid solution at normal temperature for 5-15 minutes, and the solid is iron concentrate after solid-liquid separation.
采用上述技术方案的由含磷鲕状赤铁矿制备炼铁用铁精矿的方法处理鲕状赤铁矿，能获得品位62％、P含量为0.06％以下的铁精矿。By adopting the method for preparing iron concentrate for ironmaking from phosphorus-containing oolitic hematite according to the above technical proposal, the oolitic hematite can be processed to obtain iron concentrate with a grade of 62% and a P content of less than 0.06%.
本发明的原理在于：一、鲕状赤铁矿石的特点是嵌布粒度细、磨矿易泥化，采用阶段磨选的工艺流程，可防止磨矿过程中鲕状赤铁矿石出现泥化现象，有效提高铁精矿的品位和回收率；二、分选过程中添加分散剂，有利于分散矿泥，提高了分选效果；三、鲕状赤铁矿石中的磷主要以胶磷矿形态存在，通过磨矿分选处理，所得铁精矿中的胶磷矿结构遭到，采用稀硫酸溶液洗涤可有效予以脱除。The principles of the present invention are: 1. Oolitic hematite is characterized by fine embedded particle size and easy muddying during grinding, and the process of stage grinding can prevent the oolitic hematite from appearing in the process of grinding. It can effectively improve the grade and recovery rate of iron ore concentrate; 2. Adding dispersant in the sorting process is beneficial to disperse the slime and improve the sorting effect; 3. Phosphorus in oolitic hematite is mainly in the form of glue Phosphate exists in the form of phosphate rock. Through grinding and sorting, the structure of collophanite in the obtained iron concentrate is destroyed, and it can be effectively removed by washing with dilute sulfuric acid solution.
本发明的优点主要在于：一、阶段磨选的工艺流程中，分选采用重选工艺，工艺简单成熟，成本低；二、对铁精矿进行脱磷处理，处理量小，脱磷效果好，采用0.5％～1.5％的稀硫酸溶液在常温条件下洗涤脱磷，洗涤溶液硫酸浓度低，浸出温度为常温，浸出时间短，成本低，污染少；三、适用于所有鲕状赤铁矿。The advantages of the present invention mainly lie in: 1. In the technological process of stage grinding and separation, the gravity separation process is used for separation, which is simple and mature, and the cost is low; 2. The iron concentrate is dephosphorized, with small processing capacity and good dephosphorization effect , using 0.5% to 1.5% dilute sulfuric acid solution to wash and dephosphorize under normal temperature conditions, the concentration of sulfuric acid in the washing solution is low, the leaching temperature is normal temperature, the leaching time is short, the cost is low, and the pollution is less; 3. It is suitable for all oolitic hematite .
附图说明Description of drawings
下面结合附图和具体实施方式对本发明作进一步详细说明。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
附图为本发明的工艺流程示意图。Accompanying drawing is the technological process schematic diagram of the present invention.
具体实施方式Detailed ways
实施例1，参见附图，TFe为35.27％、P为0.82％的“宁乡式”鲕状赤铁矿，湿磨至粒度小于0.074mm的赤铁矿占整个赤铁矿的质量百分比的40％左右，调整矿浆浓度至20％，添加用量为0.5kg/t的水玻璃作分散剂搅拌，使矿浆充分分散，采用螺旋溜槽分选，所得一次精矿再磨至粒度小于0.074mm占80％左右，添加用量为0.2kg/t的水玻璃作分散剂，采用摇床分选，所得铁精矿采用0.5％的硫酸浸出5min脱磷，可获得铁品位为62.21％，回收率为52.30％，P含量为0.058％的铁精矿。Example 1, referring to the accompanying drawings, the "Ningxiang type" oolitic hematite with a TFe of 35.27% and a P of 0.82%, is wet-ground to a particle size of less than 0.074mm and accounts for 40% of the mass percentage of the whole hematite %, adjust the pulp concentration to 20%, add water glass with an amount of 0.5kg/t as a dispersant and stir to fully disperse the pulp, use spiral chute for sorting, and regrind the obtained primary concentrate until the particle size is less than 0.074mm, accounting for 80% About 0.2kg/t of water glass is added as a dispersant, and the shaker is used for separation. The obtained iron concentrate is dephosphorized by leaching with 0.5% sulfuric acid for 5 minutes, and the obtained iron grade is 62.21%, and the recovery rate is 52.30%. Iron concentrate with a P content of 0.058%.
实施例2，参见附图，TFe为35.27％、P为0.82％的鲕状赤铁矿，湿磨至粒度小于0.074mm的赤铁矿占整个赤铁矿的质量百分比的50％左右，调整矿浆浓度至25％，添加用量为0.7kg/t的水玻璃作分散剂搅拌，使矿浆充分分散，采用螺旋溜槽分选，所得一次精矿再磨至粒度小于0.074mm占80％左右，添加用量为0.3kg/t的水玻璃作分散剂，采用摇床分选，所得铁精矿采用1.0％的硫酸浸出10min脱磷，可获得铁品位为63.12％，回收率为51.50％，P含量为0.055％的铁精矿。Embodiment 2, see accompanying drawing, TFe is 35.27%, P is the oolitic hematite of 0.82%, and the hematite of grain size less than 0.074mm accounts for about 50% of the mass percentage of whole hematite by wet grinding, adjusts the slurry When the concentration reaches 25%, add 0.7kg/t of water glass as a dispersant and stir to fully disperse the ore pulp. Use spiral chute for separation, and then grind the obtained primary concentrate until the particle size is less than 0.074mm, accounting for about 80%. The added amount is 0.3kg/t water glass is used as dispersant, separated by shaking table, and the obtained iron concentrate is dephosphorized by leaching with 1.0% sulfuric acid for 10 minutes. The obtained iron grade is 63.12%, the recovery rate is 51.50%, and the P content is 0.055%. of iron concentrate.
实施例3，参见附图，TFe为37.51％、P为0.88％的鲕状赤铁矿，湿磨至粒度小于0.074mm的赤铁矿占整个赤铁矿的质量百分比的60％左右，调整矿浆浓度至30％，添加用量为1kg/t的水玻璃作分散剂搅拌，使矿浆充分分散，采用螺旋溜槽分选，所得一次精矿再磨至粒度小于0.074mm占80％左右，添加用量为0.5kg/t的水玻璃作分散剂，采用摇床分选，所得铁精矿采用1％的硫酸浸出10min脱磷，可获得铁品位为63.35％，回收率为50.89％，P含量为0.050％的铁精矿。Example 3, referring to the accompanying drawings, TFe is 37.51%, P is oolitic hematite of 0.88%, wet grinding until the hematite with particle size less than 0.074mm accounts for about 60% of the mass percentage of the whole hematite, adjust the slurry When the concentration reaches 30%, add water glass at an amount of 1kg/t as a dispersant and stir to fully disperse the ore pulp, and use a spiral chute for separation. kg/t of water glass as dispersant, separated by shaking table, the obtained iron concentrate is dephosphorized by leaching with 1% sulfuric acid for 10 minutes, and the grade of iron can be 63.35%, the recovery rate is 50.89%, and the P content is 0.050%. iron concentrate.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824532A (en) * | 2010-04-02 | 2010-09-08 | 南昌大学 | Dephosphorizing method for phosphorus iron ore |
| CN102168174A (en) * | 2011-04-07 | 2011-08-31 | 中国地质大学（武汉） | Method for dephosphorizing high-phosphorus hematite |
| CN102220481A (en) * | 2011-05-26 | 2011-10-19 | 山东乾舜矿冶科技股份有限公司 | Process for extracting iron from high-silicon aluminum haematite |
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