第20卷第1期
中
矿业
No. 1
201]年1月
CHINA MINING MAGAZINE
Jan,2011
高磷
铁精矿降磷试验研究
沈慧庭,黄晓榖,包玺琳,覃华
广西大学资源与冶金学院,广西南宁530004)
摘要:本文针对某高磷
铁精矿进行降磷试验研究,采用了细磨-多次磁选,反浮选,化学浸出等多
种方法降磷。研究结果表明:该
铁精矿采用常规分选法难以获得符合治炼要求的产品,而化学浸出法可
以有效降磷,但碱浸成本较高,酸浸降磷则较为经济可行。盐酸、硝酸、硫酸浸出均可获得磷含量合格
铁精矿,但硝酸价格较髙,因此采用盐酸和硫酸为浸出剂。在适当条件下,硫酸和酸浸出均可获得铁
品位60.5%以上、磷含量0.18%的铁精矿产品
关键词;高磷铁精矿;化学浸出;酸浸;降磷。
中图分类号:TD951文献标识码:A文章编号:1004-4051(2011)01-0082-05
Research on dephosphorization of a high phosphorus-bearing iron concentrate
SHEN Hui-ting, HUANG Xiao-yi, BAO Xi-lin, QIN Hua
(College of Resources and Metallurgy, Guangxi University, Nanning 530004, China)
Abstract: In this paper, tests on dephosphorization of a high phosphorus-bearing iron concentrate were
carried out by using fine grinding ( multistep magnetic separation, reverse flotation and chemical leaching.
It is shown that the two conventional separation methods are not effective whereas chemical leaching is ef
fective for removal of phosphorus, and acid leaching is more cost-effective and feasible than alkali leaching
Qualified iron concentrate can be produced by leaching with Hcl, H2 SO, Or HNO;, but since HNO is
more expensive than Hcl and H] SO,, the latter acids are adopted as the leachants. Under the proper condt
tions, iron concentrate containing Fe higher than 60.5% with O.18% P can be obtained by leaching with
IICL and H, SO.
Key words: High phosphorus-bearing iron concentrate; chemical leaching; acid leaching; dephosphori-
钢铁产量的较快增长,对铁矿石的需求量越来
从表1可知,该铁精矿铁品位大于60%,有
越大。随着铁矿石的不断开采,易选铁矿正面临日害元素硫含量较低,而礫含量0.75%,远远超过
益短缺的局面,对难选铁矿资源的利用刻不容缓。入炉铁精矿的规定标准。
含磷较高的细粒铁矿石是难选铁矿资源利用的难题
铁精矿试样XRD与能谱分析结果表明,试样
之一。本研究针对某高磷铁精矿,采用常规分选法的主要矿物为磁铁矿、磁性赤铁矿(y-Fe2O3),其
和化学浸出法进行降磷,通过几种方法降磷效果的次是石英,所含磷矿物的主要成分为氟磷灰石
对比,提出了铁精矿酸浸降磷的工艺。该研究对处
图1示出了试样的粒度组成(用英国
理高磷铁精矿具有一定的实际意义。
APA2000
马尔文粒度仪测量)。由此可见,试样的
1试样性质
dao为18.67gm,dso为52.56m。
铁精矿试样主要化学成分分析结果见表
2常规选矿法降磷
表1铁精矿试样主要化学成分分析结果/%
2.1细磨一多次磁选
组
S
该铁精矿试样臍细至-一0.038mm100%,采用
含量60.199.461.840.1820.110.75
磁选管进行磁选试验。试验流程采用一次粗选
次扫选所得精矿合并,再进行五次精选,得到最
收稿日期:2011-09-17
终精矿铁品位62.77%,铁回收率83.14%,精矿
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