CN104071954B - A kind of alkaline process processes the method for iron red mud degree of depth dealkalize and ferrum enrichment - Google Patents

A kind of alkaline process processes the method for iron red mud degree of depth dealkalize and ferrum enrichment Download PDF

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CN104071954B
CN104071954B CN201310108984.0A CN201310108984A CN104071954B CN 104071954 B CN104071954 B CN 104071954B CN 201310108984 A CN201310108984 A CN 201310108984A CN 104071954 B CN104071954 B CN 104071954B
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red mud
dealkalize
ferrum
enrichment
iron
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CN104071954A (en
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马淑花
丁健
王月娇
郑诗礼
张懿
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Institute of Process Engineering of CAS
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Institute of Process Engineering of CAS
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

A kind of alkaline process processes the method for iron red mud degree of depth dealkalize and ferrum enrichment, the steps include: iron red mud and the strong base solution mixing that concentration is 300g/L~700g/L are carried out dissolution process, aqueous slkali and iron red mud volume mass proportioning are 4:1 20:1 (ml/g), leaching temperature is 200 300 DEG C, and the response time is 10 60min.After dissolution, solid-liquor separation obtains thick alkali liquor and dealkalize iron red mud, obtains rich scum after dealkalize red mud slag is scrubbed, in rich ferrum finishing slag sodium oxide content be not more than 1%, iron oxide content more than 40%, can be directly used for blast furnace ironmaking.The method leaching temperature and pressure are relatively low, and dealkalize effect is good, and process in leaching will not produce secondary pollution.

Description

A kind of alkaline process processes the method for iron red mud degree of depth dealkalize and ferrum enrichment
Technical field
The present invention relates to a kind of alkaline process process iron red mud carry out degree of depth dealkalize and reclaim aluminium oxide, obtain simultaneously and can be directly used for height The method of the rich ferrum finishing slag of stove ironmaking.
Background technology
Red mud be in aluminum oxide production process bauxite when highly basic leaches, the silicon of the impurity such as the ferrum in Ore, titanium and the overwhelming majority is not The solid industrial waste residue dissolved and formed.Often produce 1t aluminium oxide and just have 1.0~1.8t red mud outputs, to whole nation oxidation in the end of the year 2012 Aluminum yield is about 37,700,000 t, and year discharges red mud amount about 50,000,000 t.Red mud is stacked for a long time and is not only taken up substantial amounts of soil, must also disappear Consuming a large amount of man power and material to yard management and maintenance, and red mud is alkaline matter, the sewage that rain-out red mud produces is to water Matter and soil all have pollution, are also a kind of wastes to resource simultaneously.
The chemical composition of red mud is relevant with the production technology of the composition of former bauxite and aluminium oxide, have employed Bayer process Manufacturing Technology Division In the red mud that reason high-iron bauxite produces, iron oxide content is generally more than 30%, and this iron red mud is because of the higher tool of its iron content There is the highest value.But possibly together with the sodium oxide of about 5-10% in red mud, seriously limit the recycling of ferrum in red mud. At present, red mud dealkalization reclaims the method for sodium oxide and mainly carries out hydro-thermal reaction by interpolation calcium oxide in red mud, makes sodium oxide Enter liquid phase, and then reach to reclaim the purpose of sodium oxide, visit as patent CN1594093A and CN101423318 all disclose one Ear method red mud dealkalization method.But these methods during sodium oxide, all with the addition of a large amount of calcium oxide, unavoidably in removing red mud Reduce the content of ferrum oxide in red mud, thus reduce the value of red mud, and above-mentioned dealkalize technology be difficult to deeply Degree dealkalize, significantly impacts the recycling of red mud after dealkalize.
The ferrum component reclaimed in iron red mud generally uses following several method, and one is reduction roasting method, such as patent CN120628097A discloses a kind of method that fluid bed reduction magnetization treatment red mud prepares Iron concentrate, by 700-800 DEG C of high temperature Make Fe2O3It is changed into and there is ferromagnetic Fe3O4, then utilize magnetic separation to extract Fe3O4;Two is that red mud directly passes through electric furnace reduction The melting output pig iron, or red mud is first reduced into sponge iron, then it is smelted into steel with electric furnace, as patent CN101275182 is the most public Open such red mud method of comprehensive utilization always.Said method is used to reclaim iron process technical difficulty from iron red mud little, But universal energy consumption is high, and less economical, therefore industrial applications is less.For solid waste in alumina plant, need badly a kind of easy In industrialization, energy consumption is low, and then the low red mud degree of depth dealkalize of red mud processing cost and ferrum recovery technology.
Summary of the invention
It is an object of the invention to the deficiency existed for above-mentioned existing process iron red mud method, propose one and alkali can be utilized to be situated between Matter wet treatment iron red mud carries out degree of depth dealkalize enriched iron, and the ferrum of recovery can be directly used for the production method of blast furnace ironmaking dispensing, It is intended to energy efficient and the comprehensive utilization realizing resource effectively.
It is an object of the invention to be realized by techniques below.
The process iron red mud that the present invention provides carries out degree of depth dealkalize enriched iron, it is thus achieved that can be directly used for the side of blast furnace ironmaking dispensing Method, its step is as follows:
First, batch mixing: be transported to de-alkali reaction device after iron red mud being mixed in the ratio of liquid-solid ratio 1:4-1:20 with strong base solution In;Described strong base solution is the sodium hydroxide solution of concentration 300-700g/L, it is also possible to the potassium hydroxide being corresponding concentration scope is molten Liquid, or Crater corrosion more than 5, Na2O(K2O) concentration is the sodium aluminate solution of 230-550g/L, potassium aluminate solution;
Second, dealkalize and ferrum enrichment reaction: mixed material step (1) obtained carries out dealkalize in the reactor and ferrum enrichment is anti- Should, reaction temperature is 200-300 DEG C, and the response time is 10-60min;
3rd, separate: the quick solid-liquor separation of slip that step (2) is obtained, solid phase obtains sodium oxide through washing post-drying and contains The rich scum that amount is less than 1%, iron oxide content is more than 40%;
4th, solution purification and circulation: filtrate step (3) obtained purifies Posterior circle and utilizes, filtrate purification method uses dilute Release off method or the method for dilution interpolation calcium oxide desiliconization of silicon.
The alkaline process that the present invention provides processes the method for iron red mud degree of depth dealkalize and ferrum enrichment and has a following substantially superiority:
(1) ferrum enrichment temperature is low.Ferrum of the present invention enrichment reaction temperature be 200~300 DEG C, than traditional roasting method reduction by 600~ 800 DEG C, considerably reduce energy consumption, save production cost;
(2) dealkalize process is the most additionally added or adds the auxiliary agents such as calcium oxide on a small quantity, affects the content of ferrum oxide in slag after processing relatively Little, process in leaching will not produce secondary pollution, in rich ferrum finishing slag, calcium oxide content is about 20%, creates for follow-up blast furnace ironmaking Make advantage;
(3) can realize degree of depth dealkalize, after dealkalize process, in rich scum, sodium oxide content, less than 1%, can be directly used for blast furnace ironmaking;
(4) dealkalize couples with ferrum enrichment process, it is achieved degree of depth dealkalize and the synchronous high-efficiency promoting Iron grade are carried out, and shorten technique Flow process.
(5) dealkalize medium reusable edible.Alkaline media is after completing de-alkali reaction, the most permissible through the desiliconization purification techniques of post-mature Realize recycling of alkaline media.
Detailed description of the invention
Embodiment 1
Iron red mud, as a example by Guangxi factory Bayer process iron red mud, this Bayer process iron red mud group is processed by the method for the present invention Become (wt%) as follows:
It processes step:
Iron red mud being mixed with the NaOH solution that concentration is 550g/L and be placed in reactor, its weight is that high ferro is red Mud: NaOH is 1:4, is warming up to 300 DEG C of reaction 10min, obtains thick alkali liquor and the mix products of dealkalize red mud, to be mixed instead After answering product to be cooled to 100 DEG C, solid-liquor separation, obtain thick alkali liquor and dealkalize red mud.Through analyzing, the sodium oxide in dealkalize red mud Content is 0.87%, and iron oxide content is 43.25%;Thick alkali liquor purifies Posterior circle through desiliconization and utilizes.
Embodiment 2
Iron red mud being mixed with the NaOH solution that concentration is 700g/L and be placed in reactor, its weight is that high ferro is red Mud: NaOH is 1:10, is warming up to 250 DEG C of reaction 0.5h, obtains thick alkali liquor and the mix products of dealkalize red mud, reaction to be mixed After product is cooled to 100 DEG C, solid-liquor separation obtains thick alkali liquor and dealuminzation dealkalize red mud.Contain through analyzing the sodium oxide in dealkalize red mud Amount is 0.57%, and iron oxide content is 48.7%;Thick alkali liquor purifies Posterior circle through desiliconization and utilizes.
Embodiment 3
Iron red mud being mixed with the NaOH solution that concentration is 300g/L and be placed in reactor, its weight is that high ferro is red Mud: NaOH is 1:20, is warming up to 200 DEG C of reaction 60min, obtains thick alkali liquor and the mix products of dealkalize red mud, to be mixed instead After answering product to be cooled to 100 DEG C, solid-liquor separation obtains thick alkali liquor and dealkalize red mud.Through analyzing the sodium oxide content in dealkalize red mud Being 1.31%, iron oxide content is 40.77%;Thick alkali liquor recycles through desiliconization after-purification.

Claims (7)

1. the method that alkaline process processes iron red mud degree of depth dealkalize and ferrum enrichment, comprises the following steps:
First, batch mixing: be transported in de-alkali reaction device after iron red mud is mixed in the ratio of solid-liquid mass volume ratio 1:4-1:20 with strong base solution;Described strong base solution is the sodium hydroxide solution of concentration 300-700g/L, or concentration is 300-700g/L potassium hydroxide solution, or Crater corrosion more than 5, Na2O degree is the sodium aluminate solution of 230-550g/L, or Crater corrosion more than 5, K2O degree is the potassium aluminate solution of 230-550g/L;
Second, dealkalize and ferrum enrichment reaction: mixed material step (1) obtained carries out dealkalize and ferrum enrichment reaction in the reactor, and reaction temperature is 200-300 DEG C, and the response time is 10-60min;
3rd, separate: the quick solid-liquor separation of slip that step (2) is obtained, solid phase obtains, through washing post-drying, the rich scum that sodium oxide content is less than 1%, iron oxide content is more than 40%;
4th, solution purification and circulation: filtrate step (3) obtained purifies Posterior circle and utilizes, filtrate purification method uses the method for dilution desiliconization or dilutes the method adding calcium oxide desiliconization.
Alkaline process the most according to claim 1 processes the method for iron red mud degree of depth dealkalize and ferrum enrichment, it is characterised in that: described aqueous slkali is NaOH aqueous solution, KOH aqueous solution, sodium aluminate solution or potassium aluminate solution.
Alkaline process the most according to claim 1 and 2 processes the method for iron red mud degree of depth dealkalize and ferrum enrichment, it is characterised in that: in the alkali liquor used, the concentration of NaOH or KOH is 300-700g/L, Na in sodium aluminate2O concentration is 230-550g/L, K in potassium aluminate2O concentration is 230-550g/L.
Alkaline process the most according to claim 1 processes the method for iron red mud degree of depth dealkalize and ferrum enrichment, it is characterised in that: aqueous slkali and iron red mud volume mass proportioning ml/g are 4:1-20:1.
Alkaline process the most according to claim 1 processes the method for iron red mud degree of depth dealkalize and ferrum enrichment, it is characterised in that: reaction temperature is 200-300 DEG C.
Alkaline process the most according to claim 1 processes the method for iron red mud degree of depth dealkalize and ferrum enrichment, it is characterised in that: the response time is 10-60min.
Alkaline process the most according to claim 1 processes the method for iron red mud degree of depth dealkalize and ferrum enrichment, it is characterised in that: after process in rich ferrum finishing slag sodium oxide content be not more than 1%, iron oxide content more than 40%, can be directly used for blast furnace ironmaking.
CN201310108984.0A 2013-03-29 2013-03-29 A kind of alkaline process processes the method for iron red mud degree of depth dealkalize and ferrum enrichment Expired - Fee Related CN104071954B (en)

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CN108502907B (en) * 2018-05-18 2019-07-02 中南大学 A kind of aluminium ash and iron red mud synchronization processing method
CN109433213B (en) * 2018-11-29 2020-08-18 山东大学 Method for selectively dealkalizing red mud and enriching iron
CN110205430A (en) * 2019-07-09 2019-09-06 广东工业大学 A method of strengthening reduction roasting and recycles red mud iron component
CN112808755B (en) * 2021-02-01 2022-04-12 湖南绿脉环保科技股份有限公司 Comprehensive utilization method of high-iron low-silicon red mud

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CN102303941A (en) * 2011-09-14 2012-01-04 中国科学院过程工程研究所 Deep dealkalizing method of red mud in alumina factory
CN102500592A (en) * 2011-09-16 2012-06-20 茌平县信发盛吉赤泥处理有限公司 Method for comprehensively utilizing alumina red mud

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AU2003207988A1 (en) * 2002-02-19 2003-09-09 Tambour Ecology Ltd. Low boron desalted water production

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CN102303941A (en) * 2011-09-14 2012-01-04 中国科学院过程工程研究所 Deep dealkalizing method of red mud in alumina factory
CN102500592A (en) * 2011-09-16 2012-06-20 茌平县信发盛吉赤泥处理有限公司 Method for comprehensively utilizing alumina red mud

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