WO2023097960A1 - 一种高磷铁矿石的处理方法 - Google Patents

一种高磷铁矿石的处理方法 Download PDF

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WO2023097960A1
WO2023097960A1 PCT/CN2022/089499 CN2022089499W WO2023097960A1 WO 2023097960 A1 WO2023097960 A1 WO 2023097960A1 CN 2022089499 W CN2022089499 W CN 2022089499W WO 2023097960 A1 WO2023097960 A1 WO 2023097960A1
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phosphorus
iron ore
ore
iron
rotary kiln
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PCT/CN2022/089499
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English (en)
French (fr)
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黄武胜
延黎
孙体昌
哈贾特·侯赛因
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中钢设备有限公司
北京科技大学
阿尔及利亚国家钢铁公司
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Publication of WO2023097960A1 publication Critical patent/WO2023097960A1/zh

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    • 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
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
    • 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
    • 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
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • 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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  • the invention belongs to the technical field of mineral processing, in particular to a method for processing high-phosphorus iron ore.
  • High phosphorus iron ore is one of the typical representatives of this kind of refractory iron ore. High-phosphorus iron ore is mainly distributed in the United States, France, the United Kingdom, Canada, Norway, Nigeria, Ukraine and China, with a total reserve of more than 2 ⁇ 1010t. Due to the complex structure and high phosphorus content of this type of ore, only iron concentrates with high phosphorus content can be obtained by physical beneficiation.
  • the purpose of the present invention is to provide a method for processing high-phosphorus iron ore, and the processing method provided by the present invention can obtain iron products with better properties.
  • the invention provides a method for processing high phosphorus iron ore, comprising:
  • the roasted ore is crushed and then subjected to grinding and magnetic separation to obtain powdered reduced iron.
  • the mass ratio of the high-phosphorus iron ore, reducing agent and dephosphorizing agent is 1: (0.20-0.23): (0.12-0.16);
  • the mass of the binder is 3% to 5% of the total mass of high-phosphorus iron ore, reducing agent and dephosphorizing agent;
  • the quality of the water is 7%-8% of the total mass of the high-phosphorus iron ore, the reducing agent and the dephosphorizing agent.
  • the drying temperature is 150-180° C.; the drying time is 100-120 minutes.
  • the calcination temperature is 1280-1300° C.; the calcination time is 150-180 min.
  • the reducing atmosphere is controlled during the calcination process so that the volume content of O in the tail gas of the rotary kiln is below 1%, the volume content of CO is 15% to 20 % ; the volume content of CO is 1% to 2%;
  • the dry pellets are fed into the rotary kiln for reduction.
  • the particle size of the high-phosphorus iron ore is ⁇ 6mm, the iron grade in the high-phosphorus iron ore is 47%-58%, and the mass content of phosphorus is less than 1.2%.
  • the dephosphorization agent includes calcium carbonate and sodium carbonate.
  • the binder includes bentonite and starch.
  • the diameter of the rotary kiln is 3.5-4.8m, and the length is 60-70m.
  • the calcination after the calcination is completed, it also includes:
  • the roasted product is water-quenched to obtain roasted ore.
  • the method for treating high-phosphorus iron ore provided by the invention can be applied industrially.
  • the removal rate of phosphorus in high-phosphorus iron ore is high. Requirements, large economic value, strong adaptability, iron grade and phosphorus content of raw ore changes within a certain range will not affect the reduction effect.
  • Fig. 1 is the flow chart of the processing method of the high phosphorus iron ore that the embodiment of the present invention provides;
  • Fig. 2 is a flow chart of the method for processing high-phosphorus iron ore provided by the embodiment of the present invention.
  • Fig. 1 and Fig. 2 are the flow chart of the processing method of the high phosphorus iron ore that the embodiment of the present invention provides, the present invention provides a kind of processing method of high phosphorus iron ore, comprising:
  • the roasted ore is crushed and then subjected to grinding and magnetic separation to obtain powdered reduced iron.
  • the preparation method of the mixture preferably includes:
  • the mixed material, binder and water are mixed to obtain the mixed material.
  • the particle size of the high phosphorus iron ore is preferably ⁇ 6mm, more preferably ⁇ 5mm, more preferably ⁇ 4mm, most preferably ⁇ 3mm;
  • the iron grade in the high phosphorus iron ore can be 47 % to 58%, can be 50% to 55%, can be 52% to 53%;
  • the mass content of phosphorus in the high phosphorus iron ore can be ⁇ 1.2%, can be 0.1% to 1%, can be 0.2% ⁇ 0.8%, can be 0.3% ⁇ 0.6%.
  • the reducing agent is preferably coal.
  • the quality of the reducing agent is preferably 20% to 23% of the mass of the high-phosphorus iron ore, more preferably 21% to 22%; the higher the grade of the high-phosphorus iron ore in the present invention, the required addition The more reducing agent coal is.
  • the dephosphorization agent preferably includes calcium carbonate and sodium carbonate; the mass ratio of calcium carbonate and sodium carbonate is preferably 1:(0.09 ⁇ 0.13), more preferably 1:(0.10 ⁇ 0.12), most preferably Preferably it is 1:0.11.
  • the mass ratio of the high phosphorus iron ore, reducing agent and dephosphorizing agent is preferably 1:(0.20 ⁇ 0.23):(0.12 ⁇ 0.16), more preferably 1:(0.21 ⁇ 0.22):( 0.13 ⁇ 0.15).
  • the binder preferably includes bentonite and starch; the mass ratio of bentonite and starch is preferably (2-6):1, more preferably (3-5):1, most preferably 4: 1.
  • the quality of the binder is preferably 3% to 5% of the mass of the mixed material, more preferably 3.5% to 4.5%, most preferably 4%; the quality of the water is preferably 3% to 5% of the mass of the mixed material 7% to 8%, more preferably 7.5%.
  • the briquetting is preferably carried out on a briquetting machine.
  • the drying is preferably drying, preferably in a grate machine;
  • the drying temperature is preferably 150-180°C, more preferably 160-170°C, most preferably 165°C;
  • the drying time is preferably 100-120 min, more preferably 105-115 min, most preferably 110 min.
  • the calcination temperature is preferably 1280-1300°C, more preferably 1285-1295°C, most preferably 1290°C; the calcination time is preferably 150-180min, more preferably 160-170min, most preferably Preferably it is 165min.
  • control reduction atmosphere in the described roasting process make in the rotary kiln tail gas O
  • the volume content preferably below 1%, in the present invention in the rotary kiln tail gas O
  • the volume content of 2 is preferably 15% to 20%, more preferably 16% to 18%, most preferably 17%;
  • the volume content of CO is preferably 1% to 2%, more preferably 1.2 to 1.8%, and more preferably 1.4% ⁇ 1.6%, most preferably 1.5%;
  • the dry pellets are preferably reduced and roasted in a rotary kiln.
  • reduction roasting of the dry pellets is preferably carried out by controlling the temperature, atmosphere and residence time of the dry pellets inside the rotary kiln.
  • the obtained product is preferably cooled to obtain roasted ore; the cooling method is preferably water quenching.
  • the crushing particle size is preferably crushed to -3 mm.
  • said grinding and magnetic separation are preferably two-stage grinding and two-stage magnetic separation; said grinding preferably includes one-stage grinding and two-stage grinding; said magnetic separation preferably includes one-stage magnetic separation and two-stage Stage magnetic separation: Preferably, one stage grinding, one stage magnetic separation, two stage grinding and two stage magnetic separation are carried out in sequence.
  • the one-stage grinding is preferably ground to -0.074mm and not less than 55%, and the magnetic field strength of the one-stage magnetic separation is preferably 1400-1500 Oe, more preferably 1420-1480 Oe, most preferably 1440-1460 Oersted; the second-stage grinding is preferably ground to -0.074mm not less than 80%, and the magnetic field strength of the second-stage magnetic separation is preferably 1150-1250 Oersted, more preferably 1180-1220 Oersted, most preferably 1200 Oersted.
  • the obtained magnetic separation material is preferably filtered, dried and dehydrated to obtain powdered reduced iron; the drying and dehydrating method is preferably drying and dehydrating.
  • the powdered reduced iron is compacted to obtain lumpy reduced iron.
  • the briquetting is preferably carried out on a briquetting machine.
  • the briquetting machine is preferably an 800t press.
  • the method for treating high-phosphorus iron ore provided by the invention can be applied industrially.
  • the removal rate of phosphorus in high-phosphorus iron ore is high. Requirements, large economic value, strong adaptability, iron grade and phosphorus content of raw ore changes within a certain range will not affect the reduction effect.
  • the content of O2 in the tail gas of the rotary kiln is controlled to be
  • roasted ore with a jaw crusher to -3mm after two-stage grinding-magnetic separation (one-stage grinding, one-stage magnetic separation, two-stage grinding, and two-stage magnetic separation) to obtain powdered reduced iron, among which, one stage Grinding to -200 mesh accounts for 55%, the magnetic field strength of the first stage is 1400 Oersted; the second stage grinding to -200 mesh accounts for 80%, the magnetic field strength of the second stage is 1200 Oersted, and the magnetic separation products are filtered and dried After drying, the powdered reduced iron is obtained; the powdered reduced iron is compacted on an 800t press to obtain blocky reduced iron.
  • two-stage grinding-magnetic separation one-stage grinding, one-stage magnetic separation, two-stage grinding, and two-stage magnetic separation
  • the test results show that the iron grade of the lumpy reduced iron prepared in Example 1 of the present invention is 90.55%, the phosphorus content is 0.08%, and the iron recovery rate is 85.99%.
  • High phosphorus iron ore particle size-3mm, iron grade 47.89%, phosphorus content 0.6% add the coal of high phosphorus iron ore quality 21wt% as reducing agent, the dephosphorization agent of high phosphorus iron ore quality 14%wt% (mass Calcium carbonate and sodium carbonate with a ratio of 1:0.12) were mixed evenly to obtain a mixed material; then a mixture of bentonite and starch (mass ratio of 4:1) accounting for 5% of the mixed material was added as a binder, and then added Water, which accounts for 8% of the mass of the mixed material, is mixed and pressed into balls on a briquetting machine to obtain mixed pellets; the mixed pellets are dried at 165°C for 110min; when the temperature of the rotary kiln reaches 1300°C, the mixed pellets are Continuously fed into the rotary kiln, the residence time in the rotary kiln is 165min, the content of O2 in the tail gas of the rotary kiln is controlled
  • roasted ore with a jaw crusher to -3mm after two-stage grinding-magnetic separation (one-stage grinding, one-stage magnetic separation, two-stage grinding, and two-stage magnetic separation) to obtain powdered reduced iron, among which, one stage Grinding to -0.074mm accounts for 58%, the magnetic field strength of the first stage is 1450 Oersted; the second stage grinding to -0.074mm accounts for 82%, the magnetic field strength of the second stage is 1200 Oersted, and the magnetic separation products are filtered and dried After drying, the powdered reduced iron is obtained; the powdered reduced iron is compacted on an 800t press to obtain blocky reduced iron.
  • two-stage grinding-magnetic separation one-stage grinding, one-stage magnetic separation, two-stage grinding, and two-stage magnetic separation
  • Example 1 According to the method of Example 1, the reduced iron grade, phosphorus content, and iron recovery rate of the reduced iron prepared in Example 2 of the present invention were detected.
  • the test results were that the iron grade of the lumpy reduced iron prepared in Example 1 of the present invention was 90.25%, and the iron recovery rate was 85.76%. %, the phosphorus content is 0.07%, and the iron recovery rate is 85.23%.
  • High phosphorus iron ore particle size-3mm, iron grade 57.81%, phosphorus content 1.2% add the coal reducing agent of high phosphorus iron ore quality 23wt%, the dephosphorization agent of high phosphorus iron ore quality 16wt% (mass ratio is 1 : 0.11 of calcium carbonate and sodium carbonate) mixed evenly to obtain the mixed material; then add the mixture of bentonite and starch (mass ratio is 4:1) accounting for 6% of the mixed material quality as a binder, then add the mixed material Mix 8% water by mass and press it into balls on a ball press to obtain mixed pellets; dry the mixed pellets at 180°C for 120 minutes; when the temperature of the rotary kiln reaches 1290°C, feed the mixed pellets continuously Rotary kiln, the residence time in the rotary kiln is 170min, the content of O2 in the tail gas of the rotary kiln is controlled to be 0.5%, the content of CO2 is 21%, and the content of CO is 1.3%.
  • roasted ore with a jaw crusher to -3mm after two-stage grinding-magnetic separation (one-stage grinding, one-stage magnetic separation, two-stage grinding, and two-stage magnetic separation) to obtain powdered reduced iron, among which, one stage Grinding to -0.074mm accounts for 60%, the magnetic field strength of the first stage is 1200 Oersted; the second stage grinding to -0.074mm accounts for 85%, the magnetic field strength of the second stage is 1400 Oersted, and the magnetic separation products are filtered and dried After drying, the powdered reduced iron is obtained; the powdered reduced iron is compacted on an 800t press to obtain blocky reduced iron.
  • two-stage grinding-magnetic separation one-stage grinding, one-stage magnetic separation, two-stage grinding, and two-stage magnetic separation
  • the grade, phosphorus content and iron yield of the reduced iron prepared in Example 3 of the present invention are detected; the test results are that the iron grade of the lumpy reduced iron prepared in Example 3 of the present invention is 91.55%, and the phosphorus content 0.07%, iron recovery rate 86.89%.
  • the method for treating high-phosphorus iron ore provided by the invention can be applied industrially.
  • the removal rate of phosphorus in high-phosphorus iron ore is high. Requirements, large economic value, strong adaptability, iron grade and phosphorus content of raw ore changes within a certain range will not affect the reduction effect.

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Abstract

本发明提供了一种高磷铁矿石的处理方法，包括：将高磷铁矿石、还原剂、脱磷剂、粘结剂和水混合，得到混合物；将所述混合物进行压球，得到干球；将所述干球在回转窑中进行还原焙烧，得到焙烧矿；将所述焙烧矿破碎后进行磨矿和磁选，得到粉末还原铁。本发明提供的高磷铁矿石的处理方法以回转窑为主要焙烧设备，能够有效去除高磷铁矿石中的磷，同时生产铁品位高，磷含量低的粉末还原铁，整个工艺流程简便易行，经济价值高。

Description

一种高磷铁矿石的处理方法
本申请要求于2021年12月01日提交中国专利局、申请号为202111455981.5、发明名称为“一种高磷铁矿石的处理方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明属于矿物加工技术领域，尤其涉及一种高磷铁矿石的处理方法。
背景技术
随着世界钢铁工业的迅速发展，高品位铁矿资源逐渐减少，开发储量丰富的难处理铁矿石具有重要意义。高磷铁矿石就是这类难选铁矿石的典型代表之一。高磷铁矿石主要分布在美国、法国、英国、加拿大、阿尔及利亚、尼日利亚、哈萨克斯坦以及中国，总储量超过2×1010t。由于该类矿石的结构复杂，磷含量高，因此，采用物理选矿工艺方法只能得到磷含量较高的铁精矿，如果将该产品作为高炉炼铁的原料，在冶炼的过程中，几乎所有的磷会富集至铁水中，这种高磷铁水不能满足炼钢对原料磷含量的要求，因此，在炼钢工艺之前进行脱磷是实现高磷铁矿石有效利用的合理方式。
目前，对于高磷铁矿石利用的研究较多，对于其提铁降磷相关工艺的研究也颇为深入，但目前的研究多采用浮选、浮选-磁选联合、化学浸出、生物浸出等方法，这些方法虽然操作简单，但得到的铁精矿铁品位和回收率等都较低，去磷效果不佳，因此，研究一种高效、便捷、环境友好、工业上能应用的处理高磷铁矿石的方法极其重要。
发明内容
有鉴于此，本发明的目的在于提供一种高磷铁矿石的处理方法，本发明提供的处理方法能够获得性能较好的铁产品。
本发明提供了一种高磷铁矿石的处理方法，包括：
将高磷铁矿石、还原剂、脱磷剂、粘结剂和水混合，得到混合料；
将所述混合料进行压球，得到球团；
将所述球团进行干燥，得到干球团；
将所述干球团在回转窑中进行还原焙烧，得到焙烧矿；
将所述焙烧矿破碎后进行磨矿和磁选，得到粉末还原铁。
优选的，所述高磷铁矿石、还原剂和脱磷剂的质量比为1：(0.20～0.23)：(0.12～0.16)；
所述粘结剂的质量为高磷铁矿石、还原剂和脱磷剂总质量的3％～5％；
所述水的质量为高磷铁矿石、还原剂和脱磷剂总质量的7％～8％。
优选的，所述干燥的温度为150～180℃；所述干燥的时间为100～120min。
优选的，所述焙烧的温度为1280～1300℃；所述焙烧的时间为150～180min。
优选的，所述焙烧过程中控制还原气氛，使回转窑尾气中O 2的体积含量在1％以下，CO 2的体积含量为15％～20％；CO的体积含量为1％～2％；将干球团加入到回转窑中进行还原。
优选的，所述高磷铁矿石的粒度＜6mm，所述高磷铁矿石中铁品位47％～58％，磷质量含量小于1.2％。
优选的，所述脱磷剂包括碳酸钙和碳酸钠。
优选的，所述粘结剂包括膨润土和淀粉。
优选的，所述回转窑的直径为3.5～4.8m，长度为60～70m。
优选的，所述焙烧完成后还包括：
将焙烧后的产物进行水淬冷却，得到焙烧矿。
本发明提供的高磷铁矿石的处理方法可进行工业应用，对于高磷铁矿石中磷的去除率高，获得的还原铁的铁品位和回收率均较高，能满足作为炼钢原料的要求，经济价值较大，适应性强，原矿铁品位和磷含量在一定范围内变化不影响还原效果。
附图说明
图1为本发明实施例提供的高磷铁矿石的处理方法的流程图；
图2为本发明实施例提供的高磷铁矿石的处理方法的流程图。
具体实施方式
图1和图2为本发明实施例提供的高磷铁矿石的处理方法的流程图，本发明提供了一种高磷铁矿石的处理方法，包括：
将高磷铁矿石、还原剂、脱磷剂、粘结剂和水混合，得到混合料；
将所述混合料进行压球，得到球团；
将所述球团进行干燥，得到干球团；
将所述干球团在回转窑中进行还原焙烧，得到焙烧矿；
将所述焙烧矿破碎后进行磨矿和磁选，得到粉末还原铁。
在本发明中，所述混合料的制备方法优选包括：
将高磷铁矿石、还原剂和脱磷剂混合，得到混合物料；
将所述混合物料、粘结剂和水混合，得到混合料。
在本发明中，所述高磷铁矿石的粒度优选＜6mm，更优选为＜5mm，更优选为＜4mm，最优选为＜3mm；所述高磷铁矿石中的铁品位可以为47％～58％，可以为50％～55％，可以为52％～53％；所述高磷铁矿石中磷的质量含量可以＜1.2％，可以为0.1％～1％，可以为0.2％～0.8％，可以为0.3％～0.6％。
在本发明中，所述还原剂优选为煤。
在本发明中，所述还原剂的质量优选为高磷铁矿石质量的20％～23％，更优选为21％～22％；本发明中高磷铁矿石的品位越高，所需要添加的还原剂煤越多。
在本发明中，所述脱磷剂优选包括碳酸钙和碳酸钠；所述碳酸钙和碳酸钠的质量比优选为1：(0.09～0.13)，更优选为1：(0.10～0.12)，最优选为1：0.11。
在本发明中，所述高磷铁矿石、还原剂和脱磷剂的质量比优选为1:(0.20～0.23)：(0.12～0.16)，更优选为1:(0.21～0.22)：(0.13～0.15)。
在本发明中，所述粘结剂优选包括膨润土和淀粉；所述膨润土和淀粉的质量比优选为(2～6)：1，更优选为(3～5)：1，最优选为4：1。
在本发明中，所述粘结剂的质量优选为混合物料质量的3％～5％，更优选为3.5％～4.5％，最优选为4％；所述水的质量优选为混合物料质量的7％～8％，更优选为7.5％。
在本发明中，所述压球优选在压球机上进行。
在本发明中，所述干燥优选为烘干，优选在链篦机中进行所述干燥；所述干燥的温度优选为150～180℃，更优选为160～170℃，最优选为165℃；所述干 燥的时间优选为100～120min，更优选为105～115min，最优选为110min。
在本发明中，所述焙烧的温度优选为1280～1300℃，更优选为1285～1295℃，最优选为1290℃；所述焙烧的时间优选为150～180min，更优选为160～170min，最优选为165min。
在本发明中，所述焙烧过程中优选控制还原气氛，使回转窑尾气中O 2的体积含量优选在1％以下，本发明中回转窑尾气中O 2的体积含量越低效果越好；CO 2的体积含量优选为15％～20％，更优选为16％～18％，最优选为17％；CO体积含量优选为1％～2％，更优选为1.2～1.8％，更优选为1.4～1.6％，最优选为1.5％；所述焙烧过程中优选将干球团在回转窑中进行还原焙烧。
本发明优选通过控制干球团在回转窑内部的温度、气氛和停留时间对所述干球团进行还原焙烧。
在本发明中，所述还原焙烧完成后优选将得到的产物进行冷却，得到焙烧矿；所述冷却的方法优选为水淬冷却。
在本发明中，所述破碎粒度优选为破碎至-3mm。
在本发明中，所述磨矿和磁选优选为两段磨矿和两段磁选；所述磨矿优选包括一段磨矿和二段磨矿；所述磁选优选包括一段磁选和二段磁选；优选依次进行一段磨矿、一段磁选、二段磨矿和二段磁选。
在本发明中，所述一段磨矿优选磨矿至-0.074mm不低于55％，一段磁选的磁场强度优选为1400～1500奥斯特，更优选为1420～1480奥斯特，最优选为1440～1460奥斯特；所述二段磨矿优选磨矿至-0.074mm不低于80％，所述二段磁选磁场强度优选为1150～1250奥斯特，更优选为1180～1220奥斯特，最优选为1200奥斯特。
在本发明中，所述磁选完成后优选将得到的磁选物料进行过滤和干燥脱水，得到粉末还原铁；所述干燥脱水的方法优选为烘干脱水。
在本发明中，得到粉末还原铁后优选还包括：
将所述粉末还原铁进行压块，得到块状还原铁。
在本发明中，所述压块优选在压块机上进行。
在本发明中，所述压块机优选为800t压力机。
本发明提供的高磷铁矿石的处理方法可进行工业应用，对于高磷铁矿石中 磷的去除率高，获得的还原铁的铁品位和回收率均较高，能满足作为炼钢原料的要求，经济价值较大，适应性强，原矿铁品位和磷含量在一定范围内变化不影响还原效果。
实施例1
高磷铁矿石粒度-6mm，铁品位55.81％，磷含量0.72％，加入高磷铁矿石质量的20wt％的煤为还原剂，高磷铁矿石质量的12％wt％的脱磷剂(质量比为1:0.09的碳酸钙和碳酸钠)混合均匀，得到混合物料；再加入占混合物料质量3％的膨润土和淀粉的混匀物(质量比为4:1)为粘结剂，再加入占混合物料质量7％的水，混合均后在压球机上压制成球，得到混合球团；将混合球团在150℃下烘干120min；当回转窑温度达到1280℃时，将混合球团连续给入回转窑，在回转窑内停留时间为180min，控制回转窑尾气中O 2含量为0.9％，CO 2的含量在20％，CO的含量在1.0％，回转窑排出料直接进入水池中冷却得到焙烧矿。
焙烧矿用颚式破碎机到-3mm，经过两段磨矿-磁选(依次进行一段磨矿、一段磁选、二段磨矿、二段磁选)后，得到粉末还原铁，其中，一段磨矿至-200目占55％，一段磁选磁场强度为1400奥斯特；二段磨矿至-200目占80％，二段磁选磁场强度为1200奥斯特，磁选产品过滤烘干后得到粉末还原铁；将粉末还原铁在800t压力机上压块，得到块状还原铁。
按照GB/T 6730.5-2007《铁矿石全铁含量的测定三氯化钛还原法》标准检测还原铁的品味，采用可见分光光度计检测还原铁中的磷含量，铁的回收率根据粉末还原铁的铁品位和产率计算。
检测结果为，本发明实施例1制备的块状还原铁的铁品位90.55％，磷含量0.08％，铁回收率85.99％。
实施例2
高磷铁矿石粒度-3mm，铁品位47.89％，磷含量0.6％，加入高磷铁矿石质量21wt％的煤为还原剂，高磷铁矿石质量14％wt％的脱磷剂(质量比为1：0.12的碳酸钙和碳酸钠)混合均匀，得到混合物料；再加入占混合物料质量5％的膨润土和淀粉的混匀物(质量比为4:1)为粘结剂，再加入占混合物料质量8％的水，混合均后在压球机上压制成球，得到混合球团；将混合球团在165℃下烘干110min；当回转窑温度达到1300℃时，将混合球团连续给入回转窑，在回 转窑内停留时间为165min，控制回转窑尾气中O 2含量为0.2％，CO 2的含量在15％，CO的含量在2.0％，回转窑排出料直接进入水池中冷却得到焙烧矿。
焙烧矿用颚式破碎机到-3mm，经过两段磨矿-磁选(依次进行一段磨矿、一段磁选、二段磨矿、二段磁选)后，得到粉末还原铁，其中，一段磨矿至-0.074mm占58％，一段磁选磁场强度为1450奥斯特；二段磨矿至-0.074mm占82％，二段磁选磁场强度为1200奥斯特，磁选产品过滤烘干后得到粉末还原铁；将粉末还原铁在800t压力机上压块，得到块状还原铁。
按照实施例1的方法检测本发明实施例2制备的还原铁品味、磷含量以及铁回收率，检测结果为，本发明实施例1制备的块状还原铁的铁品位90.25％，铁回收率85.76％，磷含量0.07％，铁回收率85.23％。
实施例3
高磷铁矿石粒度-3mm，铁品位57.81％，磷含量1.2％，加入高磷铁矿石质量23wt％的煤还原剂，高磷铁矿石质量16wt％的脱磷剂(质量比为1:0.11的碳酸钙和碳酸钠)混合均匀，得到混合物料；再加入占混合物料质量6％的膨润土和淀粉的混匀物(质量比为4:1)为粘结剂，再加入占混合物料质量8％的水，混合均后在压球机上压制成球，得到混合球团；将混合球团在180℃下烘干120min；当回转窑温度达到1290℃时，将混合球团连续给入回转窑，在回转窑内停留时间为170min，控制回转窑尾气中O 2含量为0.5％，CO 2的含量在21％，CO的含量在1.3％，回转窑排出料直接进入水池中冷却得到焙烧矿。
焙烧矿用颚式破碎机到-3mm，经过两段磨矿-磁选(依次进行一段磨矿、一段磁选、二段磨矿、二段磁选)后，得到粉末还原铁，其中，一段磨矿至-0.074mm占60％，一段磁选磁场强度为1200奥斯特；二段磨矿至-0.074mm占85％，二段磁选磁场强度为1400奥斯特，磁选产品过滤烘干后得到粉末还原铁；将粉末还原铁在800t压力机上压块，得到块状还原铁。
按照实施例1的方法对本发明实施例3制备的还原铁的品味、磷含量以及铁收率进行检测；检测结果为，本发明实施例3制备的块状还原铁的铁品位91.55％，磷含量0.07％，铁回收率86.89％。
本发明提供的高磷铁矿石的处理方法可进行工业应用，对于高磷铁矿石中磷的去除率高，获得的还原铁的铁品位和回收率均较高，能满足作为炼钢原料 的要求，经济价值较大，适应性强，原矿铁品位和磷含量在一定范围内变化不影响还原效果。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (10)

  1. 一种高磷铁矿石的处理方法，包括：
    将高磷铁矿石、还原剂、脱磷剂、粘结剂和水混合，得到混合料；
    将所述混合料进行压球，得到球团；
    将所述球团进行干燥，得到干球团；
    将所述干球团在回转窑中进行还原焙烧，得到焙烧矿；
    将所述焙烧矿破碎后进行磨矿和磁选，得到粉末还原铁。
  2. 根据权利要求1所述的处理方法，其特征在于，所述高磷铁矿石、还原剂和脱磷剂的质量比为1:(0.20～0.23)：(0.12～0.16)；
    所述粘结剂的质量为高磷铁矿石、还原剂和脱磷剂总质量的3％～5％；
    所述水的质量为高磷铁矿石、还原剂和脱磷剂总质量的7％～8％。
  3. 根据权利要求1所述的处理方法，其特征在于，所述干燥的温度为150～180℃；所述干燥的时间为100～120min。
  4. 根据权利要求1所述的处理方法，其特征在于，所述焙烧的温度为1280～1300℃；所述焙烧的时间为150～180min。
  5. 根据权利要求1所述的处理方法，其特征在于，所述焙烧过程中控制还原气氛，使回转窑尾气中O 2的体积含量在1％以下，CO 2的体积含量为15％～20％；CO的体积含量为1～2％；将干球团加入到回转窑中进行还原。
  6. 根据权利要求1所述的处理方法，其特征在于，所述高磷铁矿石的粒度＜6mm，所述高磷铁矿石中铁品位47％～58％，磷质量含量小于1.2％。
  7. 根据权利要求1所述的处理方法，其特征在于，所述脱磷剂包括碳酸钙和碳酸钠。
  8. 根据权利要求1所述的处理方法，其特征在于，所述粘结剂包括膨润土和淀粉。
  9. 根据权利要求1所述的方法，其特征在于，所述回转窑的直径为3.5～4.8m，长度为60～70m。
  10. 根据权利要求1所述的方法，其特征在于，所述焙烧完成后还包括：
    将焙烧后的产物进行水淬冷却，得到焙烧矿。
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