CN105293550A - Iron removal method for aluminum chloride solution - Google Patents
Iron removal method for aluminum chloride solution Download PDFInfo
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- CN105293550A CN105293550A CN201510717686.0A CN201510717686A CN105293550A CN 105293550 A CN105293550 A CN 105293550A CN 201510717686 A CN201510717686 A CN 201510717686A CN 105293550 A CN105293550 A CN 105293550A
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- iron
- alumini chloridi
- liquor alumini
- powder
- aluminum chloride
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Abstract
The invention discloses an iron removal method for an aluminum chloride solution. According to the method, the aluminum chloride solution containing iron is mixed with aluminum wires (powder), a replacement reaction happens to generate zero-valent iron powder, and then the iron powder is separated from the aluminum chloride solution in a magnetic separating mode so that separation can be achieved. By the adoption of the method, the concentration of iron ions of the aluminum chloride solution containing iron is not restricted; on the premise that no novel impurities are introduced, the purity of the aluminum chloride solution is improved, and iron impurities in the aluminum chloride solution are removed and converted into valuable zero-valent iron powder. Compared with other iron removal methods, the method has a series of advantages that the technological process is simple, consumed time is short, the iron removal efficiency (capable of reaching 90%) is high, cost is low, energy consumption is small and the raw materials can be obtained easily. The difficult problems that an existing iron removal method is complex in working procedure, low in iron removal efficiency and high in energy consumption, and the requirement for the concentration of the iron ions in the aluminum chloride solution is demanding are solved.
Description
Technical field
The invention belongs to chemical field, relate to a kind of method for removing iron of aluminum salt solution, especially a kind of method for removing iron of liquor alumini chloridi.
Background technology
Liquor alumini chloridi is the important source material preparing the products such as aluminum chloride, poly aluminium chloride, aluminium chlorohydroxide.Liquor alumini chloridi both can pass through the acid-soluble acquisition of metallic aluminium, (hydrogen) aluminum oxide powder, also can be obtained as raw materials for production preparation by bauxite, red mud, flyash and coal gangue.The liquor alumini chloridi obtained, in production or storage and transport process, due to material purity problem or the impact by the factor such as pipeline, container, usually has a certain amount of iron ion and enters product, causes its purity not reach thus and requires and need to carry out deironing.Therefore, how more economically, efficient, energy-conservation, remove iron contamination in liquor alumini chloridi easily, obtain high purity liquor alumini chloridi, and even prepare the products such as low iron polymerize aluminum chloride, aluminium chlorohydroxide and low iron crystal aluminum chloride there is extremely important meaning.
Usually adopt in industrial production through the aluminium hydroxide of deironing process or aluminum oxide be raw material to produce low iron liquor alumini chloridi, which has limited the raw material sources producing aluminum chloride, and add production cost.So the iron ion how removed in liquor alumini chloridi becomes at present by one of problem of extensive concern.Existing removing iron from solution of aluminum chloride method is more, comprises exchange resin method deironing, is pass in resin column by the liquor alumini chloridi of iron content, utilizes resin to carry out deironing to the adsorptive power of iron, requires that the pH value of liquor alumini chloridi is 1.0-3.0, more difficult control; Recrystallization method deironing aluminum chloride crystal high-temperature is dissolved in solvent reach saturated, the process of low temperature crystallization from solution again, needs repetition crystallization to reach the effect of deironing for several times, complex technical process, need to control accurately, and energy consumption is large.Organic extraction deironing, according to organic solvent and the immiscible character of liquor alumini chloridi, iron ion is utilized to form complex compound in organic phase, iron ion is transferred in organic phase from liquor alumini chloridi, thus reach the object of deironing, but extraction agent used (phosphoric acid ester, amine, fatty acid etc.) is expensive, and there is the problem that iron is separated with extraction agent.Precipitator method deironing, utilize organic or inorganic precipitation agent optionally the precipitation of iron ions in liquor alumini chloridi to be got off, filtering separation, reach the problem reducing iron ion content in aluminum chloride, this reaction process can produce a large amount of ironic hydroxide flosss, be difficult to sedimentation, filtration and washing, even cause production process cannot carry out due to solid-liquid separation difficulty.
In sum, need the key issue solved to be how effectively to reduce energy consumption, simplification experiment flow, reduction cost at present, and improve de-ironing efficiency etc. as far as possible.The object of the invention be just to provide a kind of technological process simple, consuming time short, de-ironing efficiency is high, cost is low, the iron content removing iron from solution of aluminum chloride method of less energy consumption.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, a kind of method for removing iron of liquor alumini chloridi is provided, relative to existing iron removal technology, its advantage to be in removing liquor alumini chloridi while iron contamination, can improve aluminum chloride purity, and to the not requirement of original solution iron concentration, dedoping step can not introduce other detrimental impurity, excessive aluminium wire (powder) is easily reclaimed by filter operation continues on for deironing, can not cause negative impact to post-order process.Experiment shows, adopt the present invention, in liquor alumini chloridi, deironing rate can reach more than 90%.
The object of the invention is to solve by the following technical programs.
A method for removing iron for liquor alumini chloridi, comprises the following steps:
(1) batch mixing: iron content liquor alumini chloridi and pure aluminum mix and blend are obtained mixed solution;
(2) magnetic separation: the mixed solution that step (1) obtains is fed magnetic plant sorting, obtains magnetic simple substance iron powder and the liquor alumini chloridi containing a small amount of pure aluminum;
(3) filter: the liquor alumini chloridi containing a small amount of pure aluminum step (2) obtained filters, and the filtrate obtained is pure liquor alumini chloridi, and filter residue is pure aluminum;
(4) reclaim: step (3) gained pure aluminum is returned step (1) recycle.
Be 3-10min by the time of iron content liquor alumini chloridi and pure aluminum mix and blend in described step (1).
Described pure aluminum is aluminium wire, aluminium powder or aluminum particulate.
In described step (1), the quality of pure aluminum is m (Al)=0.17m (FeCl3)=0.17C (FeCl3) V; Wherein, m (Al) for needed for add the quality of aluminium wire (powder), g; M (FeCl3) is the quality of iron(ic) chloride impurity contained in liquor alumini chloridi, g; The concentration that C (FeCl3) is iron(ic) chloride in liquor alumini chloridi, g/L; V is liquor alumini chloridi quality, L.
Beneficial effect of the present invention is: the method for removing iron of liquor alumini chloridi solution of the present invention, be a kind of technological process simple, consuming time short, de-ironing efficiency is high, cost is low, the iron content removing iron from solution of aluminum chloride method of less energy consumption.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of a kind of high-efficient deferrization method about liquor alumini chloridi;
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, see Fig. 1.
This iron removal technology comprises the following steps:
(1) batch mixing: mixed with a certain amount of aluminium wire (powder) by iron content liquor alumini chloridi, stirs certain hour;
(2) magnetic separation: the solution that step (1) obtains is fed magnetic plant sorting, obtains magnetic product simple substance iron powder product and the liquor alumini chloridi containing a small amount of aluminium wire (powder);
(3) filter: the liquor alumini chloridi containing a small amount of aluminium wire (powder) step (2) obtained filters, and the filtrate obtained is be bordering on pure liquor alumini chloridi, and filter residue is excessive aluminium wire (powder);
(4) reclaim: step (3) gained aluminium wire (powder) is returned step (1) and continue to utilize.
In described step (1), aluminium wire (powder) mixes with iron content liquor alumini chloridi, carry out stirring deironing, aluminium wire (powder) quality added is m (Al)=0.17m (FeCl3)=0.17C (FeCl3) V.
In described step (1), iron content liquor alumini chloridi is mixed with a certain amount of aluminium wire (powder), that is the aluminium wire added (powder) quality is m (Al)=0.17m (FeCl3)=0.17C (FeCl3) V.Wherein, m (Al) for needed for add the quality of aluminium wire (powder), g; M (FeCl3) is the quality of iron(ic) chloride impurity contained in liquor alumini chloridi, g; The concentration that C (FeCl3) is iron(ic) chloride in liquor alumini chloridi, g/L; V is liquor alumini chloridi quality, L.
Aluminium wire (powder) and iron content liquor alumini chloridi mix and blend certain hour in described step (1), churning time is 3-10min.
In the magnetic plant adopted in described step (2), the part contacted with liquor alumini chloridi, there is corrosion-resistant finishes on surface.
To in described iron content liquor alumini chloridi, iron concentration no requirement (NR).
(1) to measure in liquor alumini chloridi iron(ic) chloride quality m (FeCl3) (g) or iron content concentration C (FeCl3) (g) and liquor capacity V (L), calculate required aluminium wire (powder) quality m (Al) (g) according to formula m (Al)=0.17m (FeCl3)=0.17C (FeCl3) V;
(2) mixed with aluminium wire (powder) by iron content liquor alumini chloridi, stir 3-10min, the replacement(metathesis)reaction equation of generation is FeCl3+Al=Fe+AlCl3;
(3) solution that step (2) obtains is fed magnetic separator sorting, obtain magnetic product simple substance iron powder product and the liquor alumini chloridi containing a small amount of aluminium wire (powder);
(4) liquor alumini chloridi containing a small amount of aluminium wire (powder) step (3) obtained filters, and the filtrate obtained is be bordering on pure liquor alumini chloridi, and filter residue is excessive aluminium wire (powder);
(5) step (4) gained aluminium wire (powder) is returned step (1) to continue to utilize.
Embodiment 1:
Get 4L iron content liquor alumini chloridi (AlCl3,151.00g/L; FeCl3,5.25g/L), add 3.6g aluminium wire (powder), stir 5min, feed magnetic separator magnetic separation, after obtaining magnetic product simple substance iron powder washing and drying, claim quality to be 6.55g; Non-magnetic product is containing the liquor alumini chloridi of aluminium wire (powder), and after filtration, to liquor alumini chloridi sampling and measuring, to obtain AlCl3 content be 151.78g/L, FeCl3 content is 0.51g/L), deironing rate is as calculated 90.05%.
Embodiment 2:
Get 5L iron content liquor alumini chloridi (AlCl3,85.31g/L; FeCl3,4.66g/L), add 4.2g aluminium wire (powder), stir 10min, feed magnetic separator magnetic separation, claim quality to be 7.43g after obtaining magnetic product simple substance iron powder washing and drying, non-magnetic product contains the liquor alumini chloridi of aluminium wire (powder), after filtration, to liquor alumini chloridi sampling and measuring, AlCl3 content be 86.03g/L, FeCl3 content is 0.35g/L, deironing rate is as calculated 92.5%.
Embodiment 3:
Get 10L iron content liquor alumini chloridi (AlCl3,92.47g/L; FeCl3,4.08g/L), add 7.3g aluminium wire (powder), stir 10min, feed magnetic separator magnetic separation, claim quality to be 12.85g after obtaining magnetic product simple substance iron powder washing and drying, non-magnetic product contains the liquor alumini chloridi of aluminium wire (powder), after filtration, to liquor alumini chloridi sampling and measuring, AlCl3 content be 93.09g/L, FeCl3 content is 0.36g/L, deironing rate is as calculated 92.2%.
Above content is in conjunction with concrete preferred implementation further description made for the present invention; can not assert that the specific embodiment of the present invention is only limitted to this; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; some simple deduction or replace can also be made, all should be considered as belonging to the present invention by submitted to claims determination scope of patent protection.
Claims (4)
1. a method for removing iron for liquor alumini chloridi, is characterized in that, comprises the following steps:
(1) batch mixing: iron content liquor alumini chloridi and pure aluminum mix and blend are obtained mixed solution;
(2) magnetic separation: the mixed solution that step (1) obtains is fed magnetic plant sorting, obtains magnetic simple substance iron powder and the liquor alumini chloridi containing a small amount of pure aluminum;
(3) filter: the liquor alumini chloridi containing a small amount of pure aluminum step (2) obtained filters, and the filtrate obtained is pure liquor alumini chloridi, and filter residue is pure aluminum;
(4) reclaim: step (3) gained pure aluminum is returned step (1) recycle.
2. method for removing iron as claimed in claim 1, is characterized in that: be 3-10min by the time of iron content liquor alumini chloridi and pure aluminum mix and blend in described step (1).
3. method for removing iron as claimed in claim 1, is characterized in that: described pure aluminum is aluminium wire, aluminium powder or aluminum particulate.
4. method for removing iron as claimed in claim 4, is characterized in that: in described step (1), the quality of pure aluminum is m (Al)=0.17m (FeCl3)=0.17C (FeCl3) V; Wherein, m (Al) for needed for add the quality of aluminium wire (powder), g; M (FeCl3) is the quality of iron(ic) chloride impurity contained in liquor alumini chloridi, g; The concentration that C (FeCl3) is iron(ic) chloride in liquor alumini chloridi, g/L; V is liquor alumini chloridi quality, L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510717686.0A CN105293550A (en) | 2015-10-29 | 2015-10-29 | Iron removal method for aluminum chloride solution |
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| CN201510717686.0A CN105293550A (en) | 2015-10-29 | 2015-10-29 | Iron removal method for aluminum chloride solution |
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| CN105293550A true CN105293550A (en) | 2016-02-03 |
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| CN201510717686.0A Pending CN105293550A (en) | 2015-10-29 | 2015-10-29 | Iron removal method for aluminum chloride solution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111620358A (en) * | 2020-05-14 | 2020-09-04 | 江西鹏腾实业有限公司 | Preparation method of high-purity white crystalline aluminum chloride |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102145907A (en) * | 2010-04-27 | 2011-08-10 | 中国神华能源股份有限公司 | Method for preparing low-iron aluminum chloride crystals by using fly ash as raw material |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102145907A (en) * | 2010-04-27 | 2011-08-10 | 中国神华能源股份有限公司 | Method for preparing low-iron aluminum chloride crystals by using fly ash as raw material |
Non-Patent Citations (1)
| Title |
|---|
| EBYPJP06: "氯化铝溶液中有铁离子杂质,怎样除掉", 《百度·作业帮》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111620358A (en) * | 2020-05-14 | 2020-09-04 | 江西鹏腾实业有限公司 | Preparation method of high-purity white crystalline aluminum chloride |
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Application publication date: 20160203 |