WO2019090759A1 - 湿法冶炼含铁溶液中除铁的方法及装置 - Google Patents

湿法冶炼含铁溶液中除铁的方法及装置 Download PDF

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WO2019090759A1
WO2019090759A1 PCT/CN2017/110690 CN2017110690W WO2019090759A1 WO 2019090759 A1 WO2019090759 A1 WO 2019090759A1 CN 2017110690 W CN2017110690 W CN 2017110690W WO 2019090759 A1 WO2019090759 A1 WO 2019090759A1
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iron
reactor
solution
wet
containing solution
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PCT/CN2017/110690
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English (en)
French (fr)
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殷书岩
陆业大
赵鹏飞
傅建国
李少龙
李斌
秦明晓
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中国恩菲工程技术有限公司
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Priority to CA3000146A priority Critical patent/CA3000146C/en
Priority to PCT/CN2017/110690 priority patent/WO2019090759A1/zh
Priority to US15/769,753 priority patent/US11021772B2/en
Publication of WO2019090759A1 publication Critical patent/WO2019090759A1/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
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical 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
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/02—Apparatus therefor
    • 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
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0053—Details of the reactor
    • B01J19/0066—Stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/18—Stationary reactors having moving elements inside
    • B01J19/1862—Stationary reactors having moving elements inside placed in series
    • 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

Definitions

  • the invention relates to the technical field of metal smelting, in particular to a method and a device for removing iron in a molten iron solution by wet method.
  • Iron is usually an impurity element in the wet smelting process and needs to be removed.
  • the iron in the solution is ferric iron
  • the method of direct neutralization and hydrolysis precipitation is mainly used, but the main product of this method is iron hydroxide, which is colloidal, and it is difficult to carry out solid-liquid separation. If a thickener is used for precipitation
  • the underflow concentration is usually less than 20%, and the underflow slurry will entrain a large amount of water and further treatment is required.
  • a reducing agent is first added to reduce ferric iron to divalent iron, and then oxygen or hydrogen peroxide is used as an oxidant to slowly oxidize the divalent iron to ferric iron and then neutralize the precipitate.
  • oxygen or hydrogen peroxide is used as an oxidant to slowly oxidize the divalent iron to ferric iron and then neutralize the precipitate.
  • the method forms goethite to change the sedimentation and filtration performance of the slag, but this method consumes a large amount of reducing agent and oxidant, and at the same time generates reducing slag.
  • the present invention is directed to a method and apparatus for removing iron from a molten iron solution by a wet process to solve the technical problem of requiring a large amount of reducing agent and oxidant to be consumed in the prior art.
  • the neutralizing agent is one or more selected from the group consisting of limestone, lime, magnesia, zinc oxide, and sodium hydroxide.
  • the first homogenizing distributor is a uniform dispersion device.
  • the reactor is a reactor with a stirring function.
  • the wet iron smelting iron solution contains ferrous iron
  • an oxidizing agent is added to the reactor to oxidize it to ferric iron
  • the wet smelting iron-containing solution does not contain ferrous iron, it is not necessary to An oxidant is added to the reactor.
  • the oxidant is air or oxygen.
  • an apparatus for removing iron in a molten iron solution by wet smelting comprises: a first homogenizing distributor for adding a wet smelting iron-containing solution to the reactor; a reactor for wet smelting iron in the iron-containing solution to form goethite; and a thickener, It is used to remove the goethite generated in the reactor by solid-liquid separation.
  • a second homogenizing distributor is included for adding the neutralizing agent to the reactor.
  • the first homogenizing distributor is a uniform dispersion device.
  • the reactor is a reactor with a stirring function.
  • the wet smelting iron-containing solution is added to the reactor through the homogenizing distributor, and the solution neutralizes the ferric iron into the goethite precipitate directly, without adding a large amount of reduction as in the prior art.
  • the agent and the oxidant convert the ferric iron-divalent iron-trivalent iron without the return of the seed crystal, thereby saving the running cost.
  • the precipitation of the method is easy for solid-liquid separation, and the underflow concentration of the thickener can reach more than 35%, reducing the underflow.
  • the entrainment of valuable metals in the pulp improves the recovery of valuable metals other than iron.
  • FIG. 1 is a schematic view showing the structure and process flow of an apparatus for removing iron in a wet smelting iron-containing solution according to an exemplary embodiment of the present invention.
  • the principle of iron removal by goethite method is between pH2.5-4, temperature 65 ⁇ 100°C, and the concentration of ferric iron in solution is less than 1g/L. How to control the concentration of ferric iron in solution is the key.
  • the main purpose of the process of reducing and then slowly oxidizing in the technology is to control the content of iron in the solution at a low level.
  • the main process of the present invention is to cancel the process of reduction and reoxidation, thereby reducing reagent consumption, saving investment, and also achieving the formation of goethite.
  • the purpose is to improve the sedimentation filtration performance of the solid.
  • the wet smelting iron-containing solution is added to the reactor through the homogenizing distributor, and the solution neutralizes the ferric iron into the goethite precipitate directly, without adding a large amount of reduction as in the prior art.
  • the agent and the oxidant convert the ferric iron-divalent iron-trivalent iron without the return of the seed crystal, thereby saving the running cost.
  • the precipitation of the method is easy for solid-liquid separation, and the underflow concentration of the thickener can reach more than 35%, reducing the underflow.
  • the entrainment of valuable metals in the pulp improves the recovery of valuable metals other than iron.
  • the stability of the reaction system in the reactor is favorable for the smooth progress of production.
  • the neutralizing agent is one or more selected from the group consisting of limestone, lime, magnesia, zinc oxide, and sodium hydroxide.
  • the neutralizing agent in addition to sodium hydroxide, it is usually added in the form of a slurry, and sodium hydroxide is soluble, usually a solution of a certain concentration.
  • the first homogenizing distributor is a uniform dispersion device.
  • the wet smelting iron-containing solution can be uniformly and slowly added to the reactor, which is advantageous for controlling the concentration of ferric iron in the solution anywhere in the reactor to be less than 1 g/L, and there is no unevenness due to excessive concentration.
  • the reactor is a stirred reactor and utilizes to maintain the uniformity of the solution in the reactor.
  • an oxidizing agent is introduced into the reactor to oxidize it to ferric iron; when the wet smelting iron solution contains no two In the case of valence iron, it is not necessary to introduce an oxidant into the reactor. Because when there is a part of the ferrous iron in the iron smelting solution, the oxidizing agent such as air/oxygen is used to oxidize the ferrous iron in the iron smelting solution to ferric iron and simultaneously remove the iron. The removal rate can reach 90 to 98%.
  • an apparatus for removing iron in a molten iron solution by wet smelting comprises: a first homogenizing distributor for adding a wet smelting iron-containing solution to the reactor, a reactor for wet smelting iron in the iron-containing solution to form goethite, and The thickener that the goethite produced in the reactor is removed by solid-liquid separation.
  • the wet smelting iron-containing solution is added to the reactor through the homogenizing distributor, and the solution neutralizes the ferric iron into the goethite precipitate directly, without adding a large amount of reduction as in the prior art.
  • the agent and the oxidant convert the ferric iron-divalent iron-trivalent iron without the return of the seed crystal, thereby saving the running cost.
  • the precipitation of the method is easy for solid-liquid separation, and the underflow concentration of the thickener can reach more than 35%, reducing the underflow.
  • the entrainment of valuable metals in the pulp improves the recovery of valuable metals other than iron.
  • a second homogenizing distributor is further included for adding the neutralizing agent to the reactor, because the homogenizing distributor can uniformly and slowly add the neutralizing agent to the reactor, thereby improving the stability of the reaction system in the reactor. It is conducive to the smooth progress of production.
  • the first homogenizing distributor is a uniform dispersion device. This can make the wet smelting iron solution evenly and slowly Into the reactor, it is beneficial to control the concentration of ferric iron in the solution anywhere in the reactor to be less than 1g / L, and there will be no unevenness due to excessive concentration. More preferably, the reactor is a stirred reactor and utilizes to maintain the uniformity of the solution in the reactor.
  • a ferric-containing solution 2 of 65 to 100 ° C is introduced into a stirred reactor group through a first homogenizing distributor 11 , usually two or more.
  • a first homogenizing distributor 11 usually two or more.
  • the first reactor 10 and the second reactor 20 are connected by a self-flow, and in the first reactor 10, the second homogenization is simultaneously performed.
  • the distributor 12 is added with a neutralizer 1 such as limestone/lime/magnesia/zinc oxide/sodium hydroxide, and the pH of the reactor is maintained between 2.5 and 4, and the reaction time is 1. to 3 hours.
  • a gold pressurized pre-oxidation project is pressurized with oxidized ferric solution in a ferric solution of 15 g / L, controlling the concentration of ferric iron in the reactor is less than 1 g / L, and controlling the reactor
  • the pH of the solution is 3 ⁇ 4, the temperature is 70°C, the sulfuric acid is 10g/L, and 4 iron ore iron removal tanks (reactors) are used.
  • the reaction time is 2 hours.
  • the concentration of ferric iron in the solution after de-ironing is about 0.07g. /L, the iron removal rate is about 99%, and the thickener underflow concentration is 40%.
  • the above-mentioned embodiments of the present invention achieve the following technical effects: by adding a wet smelting iron-containing solution to the reactor through a homogenizing distributor, the solution can directly convert the ferric iron into a solution.
  • the concentration of the underflow of the thickener can reach more than 35%, reducing the entrainment of valuable metals in the underflow slurry, and improving the recovery rate of valuable metals other than iron.

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Abstract

一种湿法冶炼含铁溶液中除铁的方法及装置，其中，该方法包括以下步骤：通过第一均化布料器（11）将湿法冶炼含铁溶液加入到反应器中，控制反应器中三价铁的浓度低于1g/L，且控制反应器内溶液的pH＝2.5～4，温度为65～100℃，反应时间为1～3小时，反应后的溶液进行固液分离，以针铁矿的形式去除湿法冶炼含铁溶液中的铁。

Description

湿法冶炼含铁溶液中除铁的方法及装置 技术领域
本发明涉及金属冶炼技术领域，具体而言，涉及一种湿法冶炼含铁溶液中除铁的方法及装置。
背景技术
湿法冶炼过程中铁通常为杂质元素，需要进行去除。当溶液中的铁是三价铁时，目前主要采用直接中和水解沉淀的方法，但此种方法主要产物为氢氧化铁，呈胶体状，很难进行固液分离，如果采用浓密机进行沉淀，底流浓度通常小于20％，底流矿浆会夹带走大量的水，还需进一步处理。或者如专利CN 102010994A和专利CN 103468951A所述，先加还原剂将三价铁还原成二价铁，再通氧气或双氧水作为氧化剂将二价铁缓慢氧化为三价铁再加中和剂沉淀的方式形成针铁矿，以此改变渣的沉降及过滤性能，但此种方法需消耗大量还原剂和氧化剂，同时生成还原渣。
发明内容
本发明旨在提供一种湿法冶炼含铁溶液中除铁的方法及装置，以解决现有技术中需要消耗大量还原剂和氧化剂的技术问题。
为了实现上述目的，根据本发明的一个方面，提供了一种湿法冶炼含铁溶液中除铁的方法。该方法包括以下步骤：通过第一均化布料器将湿法冶炼含铁溶液加入到反应器中，控制反应器中三价铁的浓度低于1g/L，且控制反应器内溶液的pH＝2.5～4，温度为65～100℃，反应时间为1～3小时，反应后的溶液进行固液分离，以针铁矿的形式去除湿法冶炼含铁溶液中的铁。
进一步地，控制反应器内溶液的pH＝2.5～4是通过第二均化布料器向反应器加入中和剂实现的。
进一步地，中和剂为选自石灰石、石灰、氧化镁、氧化锌和氢氧化钠组成的组中的一种或多种。
进一步地，第一均化布料器为均匀分散装置。
进一步地，反应器为带搅拌功能的反应器。
进一步地，当湿法冶炼含铁溶液中含有二价铁时，向反应器中加入氧化剂将其氧化成三价铁；当湿法冶炼含铁溶液中不含二价铁时，则不需要向反应器中加入氧化剂。
进一步地，氧化剂为空气或氧气。
进一步地，反应器为多个，且多个反应器之间为自流连接。
根据本发明的另一方面，提供了一种湿法冶炼含铁溶液中除铁的装置。该装置包括：第一均化布料器，用于将湿法冶炼含铁溶液加入到反应器中；反应器，用于湿法冶炼含铁溶液中的铁反应生成针铁矿；以及浓密机，用于将反应器中生成的针铁矿通过固液分离去除。
进一步地，还包括第二均化布料器，用于将中和剂加入到反应器。
进一步地，第一均化布料器为均匀分散装置。
进一步地，反应器为带搅拌功能的反应器。
进一步地，反应器为多个，且多个反应器之间为自流连接。
应用本发明的技术方案，通过均化布料器将湿法冶炼含铁溶液加入到反应器中，可直接将溶液中和三价铁转化为针铁矿沉淀，无需像现有技术那样加入大量还原剂和氧化剂进行三价铁-二价铁-三价铁的转化，无需晶种返回，节约了运行成本，此种方法沉淀容易固液分离，浓密机底流浓度可达到35％以上，减少了底流矿浆中有价金属的夹带，提高了除铁外有价金属的回收率。
附图说明
构成本申请的一部分的说明书附图用来提供对本发明的进一步理解，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1示出了根据本发明一典型的实施方式的湿法冶炼含铁溶液中除铁的装置结构及工艺流程示意图。
具体实施方式
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本发明。
针铁矿法除铁的原理在pH2.5-4之间，温度65～100℃，溶液中三价铁的浓度低于1g/L，如何控制溶液中三价铁的浓度是关键，现有技术中先还原再缓慢氧化的工艺主要目的是控制溶液中的铁的含量在低水平，本发明的主要过程是取消还原再氧化的过程，以减少试剂消耗，节约投资，同样达到生成针铁矿目的，改善固体的沉降过滤性能。
根据本发明一种典型的实施方式，提供一种湿法冶炼含铁溶液中除铁的方法。该方法包括以下步骤：通过第一均化布料器将湿法冶炼含铁溶液加入到反应器中，控制反应器中三价铁的浓度低于1g/L，且控制反应器内溶液的pH＝2.5～4，温度为65～100℃，反应时间为1～3小时，反应后的溶液进行固液分离，以针铁矿的形式去除湿法冶炼含铁溶液中的铁。
反应式如下：
Fe3++2H2O＝FeOOH+2H+
应用本发明的技术方案，通过均化布料器将湿法冶炼含铁溶液加入到反应器中，可直接将溶液中和三价铁转化为针铁矿沉淀，无需像现有技术那样加入大量还原剂和氧化剂进行三价铁-二价铁-三价铁的转化，无需晶种返回，节约了运行成本，此种方法沉淀容易固液分离，浓密机底流浓度可达到35％以上，减少了底流矿浆中有价金属的夹带，提高了除铁外有价金属的回收率。
优选的，控制反应器内溶液的pH＝2.5～4是通过第二均化布料器向反应器加入中和剂实现的，因为均化布料器可以使中和剂均匀缓慢的加入反应器，提高了反应器中反应体系的稳定性，有利于生产的顺利进行。优选的，反应器为多个，且多个反应器之间为自流连接，可以控制反应时间为1～3小时。
根据本发明一种典型的实施方式，中和剂为选自石灰石、石灰、氧化镁、氧化锌和氢氧化钠组成的组中的一种或多种。在实际操作过程中，除氢氧化钠外通常是以浆体的形式加入，氢氧化钠是可溶解的，通常是配成一定的浓度的溶液加入。
优选的，第一均化布料器为均匀分散装置。这样可以使湿法冶炼含铁溶液均匀缓慢的加入反应器，有利于控制反应器中任何处溶液三价铁的浓度低于1g/L，不会因为加入太集中而出现不均匀的情况。更优选的，反应器为带搅拌功能的反应器，有利用保持反应器内溶液的均匀性。
根据本发明一种典型的实施方式，当湿法冶炼含铁溶液中含有二价铁时，向反应器中通入氧化剂将其氧化成三价铁；当湿法冶炼含铁溶液中不含二价铁时，则不需要向反应器中通入氧化剂。因为当湿法冶炼含铁溶液中有部分二价铁时，通入氧化剂，如空气/氧气等，将湿法冶炼含铁溶液中的二价铁氧化成三价铁，同时去除，这样铁的去除率可达到90～98％。
根据本发明一种典型的实施方式，提供一种湿法冶炼含铁溶液中除铁的装置。该装置包括：用于将湿法冶炼含铁溶液加入到反应器中的第一均化布料器，用于湿法冶炼含铁溶液中的铁反应生成针铁矿的反应器，以及用于将反应器中生成的针铁矿通过固液分离去除的浓密机。
应用本发明的技术方案，通过均化布料器将湿法冶炼含铁溶液加入到反应器中，可直接将溶液中和三价铁转化为针铁矿沉淀，无需像现有技术那样加入大量还原剂和氧化剂进行三价铁-二价铁-三价铁的转化，无需晶种返回，节约了运行成本，此种方法沉淀容易固液分离，浓密机底流浓度可达到35％以上，减少了底流矿浆中有价金属的夹带，提高了除铁外有价金属的回收率。
优选的，还包括第二均化布料器，用于将中和剂加入到反应器，因为均化布料器可以使中和剂均匀缓慢的加入反应器，提高了反应器中反应体系的稳定性，有利于生产的顺利进行。优选的，反应器为多个，且多个反应器之间为自流连接，可以控制反应时间为1～3小时。
优选的，第一均化布料器为均匀分散装置。这样可以使湿法冶炼含铁溶液均匀缓慢的加 入反应器，有利于控制反应器中任何处溶液三价铁的浓度低于1g/L，不会因为加入太集中而出现不均匀的情况。更优选的，反应器为带搅拌功能的反应器，有利用保持反应器内溶液的均匀性。
根据本发明一种典型的实施方式，如图1所示，将65～100℃的含三价铁的溶液2通过第一均化布料器11加入带搅拌的一组反应器，通常2个以上，在本实施方式中为第一反应器10和第二反应器20中，第一反应器10和第二反应器20之间为自流连接，在第一反应器10中同时通过第二均化布料器12加入石灰石/石灰/氧化镁/氧化锌/氢氧化钠等中和剂1，将反应器的pH维持在2.5～4之间，反应时间1.～3小时。当含三价铁的溶液2中无二价铁时，过程中无需加入氧化剂，当含三价铁的溶液2中有部分二价铁时，也可通入氧化剂，如空气/氧气等，将二价铁氧化成三价铁同时去除，铁的去除率可达到90～98％。反应后的矿浆直接进浓密机30进行固液分离，其中浓密机底流4为含铁渣，常规高效浓密机底流浓度35％以上，溢流3为除铁后溶液，分别去相应的工序处理。
下面将结合实施例进一步说明本发明的有益效果。
实施例1
采用如图1所示的装置，某黄金加压预氧化项目加压氧化后含铁溶液中三价铁15g/L，控制反应器中三价铁的浓度低于1g/L，且控制反应器内溶液的pH＝3～4，温度70℃，硫酸10g/L，采用4台针铁矿除铁槽(反应器)，反应时间2小时，除铁后溶液中三价铁的浓度约0.07g/L，除铁率约99％，浓密机底流浓度40％。
实施例2
采用如图1所示的装置，某项目含铜溶液三价铁11g/L，控制反应器中三价铁的浓度低于1g/L，且控制反应器内溶液的pH＝3～4，温度80℃，硫酸5g/L，采用3台针铁矿除铁槽(反应器)，反应时间1.5小时，除铁后溶液中三价铁的浓度约0.05g/L，除铁率约99％，浓密机底流浓度36％。
实施例3
采用如图1所示的装置，试验室中对某含铁溶液6g/L，控制反应器中三价铁的浓度低于1g/L，且控制反应器内溶液的pH＝3～4，温度65℃，硫酸2g/L，采用针铁矿除铁槽(反应器)，反应时间2.5小时，除铁后溶液中三价铁的浓度约0.3g/L，除铁率约95％，固液分离浓密机底流浓度35％。
实施例4
采用如图1所示的装置，试验室中对某含铁溶液12g/L，控制反应器中三价铁的浓度低于1g/L，且控制反应器内溶液的pH＝2.5～4，温度100℃，硫酸2g/L，采用针铁矿除铁槽(反应器)，反应时间1小时，除铁后溶液中三价铁的浓度约0.02g/L，除铁率约99％，固液分离浓密机底流浓度45％。
从以上的描述中，可以看出，本发明上述的实施例实现了如下技术效果：通过均化布料器将湿法冶炼含铁溶液加入到反应器中，可直接将溶液中和三价铁转化为针铁矿沉淀，无需像现有技术那样加入大量还原剂和氧化剂进行三氧化铁-二氧化铁-三氧化铁的转化，无需晶种返回，节约了运行成本，此种方法沉淀容易固液分离，浓密机底流浓度可达到35％以上，减少了底流矿浆中有价金属的夹带，提高了除铁外有价金属的回收率。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (13)

  1. 一种湿法冶炼含铁溶液中除铁的方法，其特征在于，包括以下步骤：通过第一均化布料器将湿法冶炼含铁溶液加入到反应器中，控制所述反应器中三价铁的浓度低于1g/L，且控制所述反应器内溶液的pH＝2.5～4，温度为65～100℃，反应时间为1～3小时，反应后的溶液进行固液分离，以针铁矿的形式去除所述湿法冶炼含铁溶液中的铁。
  2. 根据权利要求1所述的方法，其特征在于，控制所述反应器内溶液的pH＝2.5～4是通过第二均化布料器向所述反应器加入中和剂实现的。
  3. 根据权利要求2所述的方法，其特征在于，所述中和剂为选自石灰石、石灰、氧化镁、氧化锌和氢氧化钠组成的组中的一种或多种。
  4. 根据权利要求1所述的方法，其特征在于，所述第一均化布料器为均匀分散装置。
  5. 根据权利要求1所述的方法，其特征在于，所述反应器为带搅拌功能的反应器。
  6. 根据权利要求1所述的方法，其特征在于，当所述湿法冶炼含铁溶液中含有二价铁时，向所述反应器中加入氧化剂将其氧化成三价铁；当所述湿法冶炼含铁溶液中不含二价铁时，则不需要向所述反应器中加入氧化剂。
  7. 根据权利要求6所述的方法，其特征在于，所述氧化剂为空气或氧气。
  8. 根据权利要求1所述的方法，其特征在于，所述反应器为多个，且多个所述反应器之间为自流连接。
  9. 一种湿法冶炼含铁溶液中除铁的装置，其特征在于，包括：
    第一均化布料器，用于将湿法冶炼含铁溶液加入到反应器中；
    所述反应器，用于所述湿法冶炼含铁溶液中的铁反应生成针铁矿；以及
    浓密机，用于将所述反应器中生成的针铁矿通过固液分离去除。
  10. 根据权利要求9所述的装置，其特征在于，还包括第二均化布料器，用于将中和剂加入到所述反应器。
  11. 根据权利要求9所述的装置，其特征在于，所述第一均化布料器为均匀分散装置。
  12. 根据权利要求9所述的装置，其特征在于，所述反应器为带搅拌功能的反应器。
  13. 根据权利要求9所述的装置，其特征在于，所述反应器为多个，且多个所述反应器之间为自流连接。
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