CN104071954A - Method of treating high-iron red mud by alkaline process for deep dealkalization and iron enrichment - Google Patents
Method of treating high-iron red mud by alkaline process for deep dealkalization and iron enrichment Download PDFInfo
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- CN104071954A CN104071954A CN201310108984.0A CN201310108984A CN104071954A CN 104071954 A CN104071954 A CN 104071954A CN 201310108984 A CN201310108984 A CN 201310108984A CN 104071954 A CN104071954 A CN 104071954A
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- iron
- red mud
- dealkalize
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- Y02P10/20—Recycling
Abstract
The invention discloses a method of treating high-iron red mud by alkaline process for deep dealkalization and iron enrichment. The method comprises the following steps: mixing the high-iron red mud with a strong alkali solution of which the concentration is 300-700g/L to perform dissolution treatment under the conditions that the volume and mass ratio of the alkali solution to the high-iron red mud is (4 to 1)-(20 to 1) (ml/g), the dissolution temperature is 200-300 DEG C, and the reaction time is 10-60 minutes; performing liquid-solid separation to obtain a crude alkali solution and dealkalized high-iron red mud after dissolution, and washing dealkalized high-iron red mud slag to obtain iron-enriched slag, wherein the sodium oxide content in the iron-enriched slag is not more than 1%, and the iron oxide content in the iron-enriched slag is more than 40%, thus the iron-enriched slag can be directly used for blast furnace iron-making. The method is relatively low in dissolution temperature and pressure and good in dealkalization effect, and can not generate secondary pollution in the dissolution process.
Description
Technical field
The present invention relates to a kind of alkaline process processing iron red mud and carry out degree of depth dealkalize and reclaim aluminum oxide, obtain the method that can be directly used in the rich iron finishing slag of blast furnace ironmaking simultaneously.
Background technology
Red mud is that in aluminum oxide production process, bauxite silicon of the impurity such as the iron in ore, titanium and the overwhelming majority when highly basic leaches does not dissolve and the solid industrial residue that forms.Every production 1t aluminum oxide just has 1.0～1.8t red mud output, to 2012 end of the year whole nations aluminum oxide output, is about 3,770 ten thousand t, year discharges red mud amount approximately 5,000 ten thousand t.The long-term stacking of red mud not only takies a large amount of soils, also must consume a large amount of man power and materials to yard management and maintenance, and red mud is alkaline matter, and the sewage that rain-out red mud produces all has pollution to water quality and soil, is also a kind of waste to resource simultaneously.
The chemical composition of red mud is relevant with the production technique of the composition of former bauxite and aluminum oxide, adopted Bayer process production technique to process in the red mud of high-iron bauxite generation, iron oxide content is generally more than 30%, and this iron red mud has very high utility value because its iron level is higher.But also containing the sodium oxide of the 5-10% that has an appointment, seriously limited the recycling of iron in red mud in red mud.At present, the method that red mud dealkalization reclaims sodium oxide is mainly to carry out hydro-thermal reaction by add calcium oxide in red mud, make sodium oxide enter liquid phase, and then reach the object that reclaims sodium oxide, as patent CN1594093A and CN101423318 all disclose a kind of Bayer process red mud dealkalization method.But these methods are in removing red mud during sodium oxide, all add a large amount of calcium oxide, inevitably reduced the content of ferric oxide in red mud, thereby reduced the utility value of red mud, and above-mentioned dealkalize technology is difficult to realize degree of depth dealkalize, greatly affected the recycling of red mud after dealkalize.
The iron component reclaiming in iron red mud adopts following several method conventionally, and the one, reduction roasting method, processes as patent CN120628097A discloses a kind of fluid bed reduction magnetization the method that red mud is prepared iron fine powder, by 700-800 ℃ of high temperature, makes Fe
2o
3change into and there is ferromagnetic Fe
3o
4, then utilize magnetic separation to extract Fe
3o
4; The 2nd, red mud is directly passed through to the electric furnace reduction melting output pig iron, or red mud is first reduced into sponge iron, then with electric furnace, be smelted into steel, the method for comprehensive utilization of red mud always as disclosed in patent CN101275182.Adopt aforesaid method from iron red mud, to reclaim iron process technical difficulty little, but general energy consumption is high, less economical, so industrial applications is less.For solid waste in alumina plant, need a kind of industrialization that is easy to badly, energy consumption is low, and then the low dealkalize of the red mud degree of depth and the iron recovery technology of red mud processing cost.
Summary of the invention
The object of the invention is the deficiency existing for above-mentioned existing processing iron red mud method, propose a kind of alkaline media wet processing iron red mud of can utilizing and carry out degree of depth dealkalize enriched iron, the iron reclaiming can be directly used in the production method of blast furnace ironmaking batching, is intended to energy efficient and the comprehensive utilization that realizes resource effectively.
The object of the invention is to realize by following technology.
Processing iron red mud provided by the invention is carried out degree of depth dealkalize enriched iron, and acquisition can be directly used in the method for blast furnace ironmaking batching, and its step is as follows:
The first, batch mixing: be transported in de-alkali reaction device after iron red mud and strong base solution are mixed in the ratio of liquid-solid ratio 1:4-1:20; Described strong base solution is the sodium hydroxide solution of concentration 300-700g/L, can be also the potassium hydroxide solution of corresponding concentration scope, or causticity ratio is greater than 5, Na
2o(K
2o) sodium aluminate solution that concentration is 230-550g/L, potassium aluminate solution;
The second, dealkalize and iron enrichment reaction: the mixture that step (1) is obtained carries out dealkalize and iron enrichment reaction in reactor, and temperature of reaction is 200-300 ℃, and the reaction times is 10-60min;
The 3rd, separation: the quick liquid-solid 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 greater than 40%;
The 4th, solution purification and circulation: recycle after the filtrate that step (3) is obtained purifies, filtrate purifying method adopts the method for dilution desiliconization or the method that calcium oxide desiliconization is added in dilution.
The method that alkaline process provided by the invention is processed iron red mud degree of depth dealkalize and iron enrichment has following obviously superiority:
(1) iron enrichment temperature is low.Iron enrichment temperature of reaction of the present invention is 200～300 ℃, than traditional roasting method, reduces by 600～800 ℃, has significantly reduced production energy consumption, saves production cost;
(2) auxiliary agents such as calcium oxide are not additionally added or add on a small quantity to dealkalize process, less to processing the content influence of ferric oxide in rear slag, in process in leaching, can not produce secondary pollution, in rich iron finishing slag, calcium oxide content is in 20% left and right, for follow-up blast furnace ironmaking creates favorable conditions;
(3) can realize degree of depth dealkalize, sodium oxide content in rear rich scum is processed in dealkalize, lower than 1%, can be directly used in blast furnace ironmaking;
(4) dealkalize and the coupling of iron enrichment process, realize degree of depth dealkalize and carry out with the synchronous high-efficiency that promotes iron grade, shortened technical process.
(5) dealkalize medium reusable edible.Alkaline media, after completing de-alkali reaction, just can be realized the recycle of alkaline media through the desiliconization purification techniques of post-mature.
Embodiment
Embodiment 1
By method of the present invention, process iron red mud, the Guangxi factory Bayer process iron red mud of take is example, and it is as follows that this Bayer process iron red mud forms (wt%):
Its treatment step is:
The NaOH solution that is 550g/L with concentration by iron red mud mixes and is placed in reactor, its weight part proportioning is that iron red mud: NaOH is 1:4, be warming up to 300 ℃ of reaction 10min, obtain the mix products of thick alkali lye and dealkalize red mud, reaction product to be mixed is cooled to after 100 ℃, liquid-solid separation, obtains thick alkali lye and dealkalize red mud.By analysis, the sodium oxide content in dealkalize red mud is 0.87%, and iron oxide content is 43.25%; The recycle after desiliconization purifies of thick alkali lye.
Embodiment 2
The NaOH solution that is 700g/L with concentration by iron red mud mixes and is placed in reactor, its weight part proportioning is that iron red mud: NaOH is 1:10, be warming up to 250 ℃ of reaction 0.5h, obtain the mix products of thick alkali lye and dealkalize red mud, reaction product to be mixed is cooled to after 100 ℃, and liquid-solid separation obtains thick alkali lye and dealuminzation dealkalize red mud.Sodium oxide content in dealkalize red mud is 0.57% by analysis, and iron oxide content is 48.7%; The recycle after desiliconization purifies of thick alkali lye.
Embodiment 3
The NaOH solution that is 300g/L with concentration by iron red mud mixes and is placed in reactor, its weight part proportioning is that iron red mud: NaOH is 1:20, be warming up to 200 ℃ of reaction 60min, obtain the mix products of thick alkali lye and dealkalize red mud, reaction product to be mixed is cooled to after 100 ℃, and liquid-solid separation obtains thick alkali lye and dealkalize red mud.Sodium oxide content in dealkalize red mud is 1.31% by analysis, and iron oxide content is 40.77%; Thick alkali lye is through desiliconization after purification recycle.
Claims (7)
1. alkaline process is processed a method for iron red mud degree of depth dealkalize and iron enrichment, comprises the following steps:
The first, batch mixing: be transported in de-alkali reaction device after iron red mud and strong base solution are mixed in the ratio of solid-liquid mass volume ratio 1:4-1:20; Described strong base solution is the sodium hydroxide solution of concentration 300-700g/L, or concentration is 300-700g/L potassium hydroxide solution, or causticity ratio is greater than 5, Na
2o degree is the sodium aluminate solution of 230-550g/L, or causticity ratio is greater than 5, K
2o degree is the potassium aluminate solution of 230-550g/L;
The second, dealkalize and iron enrichment reaction: the mixture that step (1) is obtained carries out dealkalize and iron enrichment reaction in reactor, and temperature of reaction is 200-300 ℃, and the reaction times is 10-60min;
The 3rd, separation: the quick liquid-solid 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 greater than 40%;
The 4th, solution purification and circulation: recycle after the filtrate that step (3) is obtained purifies, filtrate purifying method adopts the method for dilution desiliconization or the method that calcium oxide desiliconization is added in dilution.
2. alkaline process according to claim 1 is processed the method for iron red mud degree of depth dealkalize and iron enrichment, it is characterized in that: described alkaline solution is the NaOH aqueous solution, the KOH aqueous solution, sodium aluminate solution or potassium aluminate solution.
3. alkaline process according to claim 1 and 2 is processed the method for iron red mud degree of depth dealkalize and iron enrichment, it is characterized in that: in the alkali lye adopting, the concentration of NaOH or KOH is 300-700g/L Na in sodium aluminate
2o concentration is 230-550g/L, K in potassium aluminate
2o concentration is 230-550g/L.
4. alkaline process according to claim 1 is processed the method for iron red mud degree of depth dealkalize and iron enrichment, it is characterized in that: alkaline solution and iron red mud volume mass proportioning are 4:1-20:1 (ml/g).
5. alkaline process according to claim 1 is processed the method for iron red mud degree of depth dealkalize and iron enrichment, it is characterized in that: temperature of reaction is 200-300 ℃.
6. alkaline process according to claim 1 is processed the method for iron red mud degree of depth dealkalize and iron enrichment, it is characterized in that: the reaction times is 10-60min.
7. alkaline process according to claim 1 is processed the method for iron red mud degree of depth dealkalize and iron enrichment, it is characterized in that: process afterwards in rich iron finishing slag that sodium oxide content is not more than 1%, iron oxide content is greater than 40%, can be directly used in blast furnace ironmaking.
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| CN201310108984.0A CN104071954B (en) | 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 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108502907A (en) * | 2018-05-18 | 2018-09-07 | 中南大学 | A kind of aluminium ash and iron red mud synchronization processing method |
| CN109433213A (en) * | 2018-11-29 | 2019-03-08 | 山东大学 | A kind of method of red mud selectivity dealkalize and enriched 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 |
| CN112808755A (en) * | 2021-02-01 | 2021-05-18 | 湖南绿脉环保科技股份有限公司 | Comprehensive utilization method of high-iron low-silicon red mud |
| CN113333437A (en) * | 2021-05-31 | 2021-09-03 | 东北大学 | Method for comprehensively treating high-calcium red mud and high-iron red mud |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003070361A1 (en) * | 2002-02-19 | 2003-08-28 | Tambour Ecology Ltd. | Low boron desalted water production |
| 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 |
-
2013
- 2013-03-29 CN CN201310108984.0A patent/CN104071954B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003070361A1 (en) * | 2002-02-19 | 2003-08-28 | Tambour Ecology Ltd. | Low boron desalted water production |
| 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108502907A (en) * | 2018-05-18 | 2018-09-07 | 中南大学 | A kind of aluminium ash and iron red mud synchronization processing method |
| CN109433213A (en) * | 2018-11-29 | 2019-03-08 | 山东大学 | A kind of method of red mud selectivity dealkalize and enriched iron |
| 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 |
| CN112808755A (en) * | 2021-02-01 | 2021-05-18 | 湖南绿脉环保科技股份有限公司 | Comprehensive utilization method of high-iron low-silicon red mud |
| CN113333437A (en) * | 2021-05-31 | 2021-09-03 | 东北大学 | Method for comprehensively treating high-calcium red mud and high-iron red mud |
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