CN107215884A - A kind of processing method of alumina waste water slag - Google Patents
A kind of processing method of alumina waste water slag Download PDFInfo
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- CN107215884A CN107215884A CN201710424153.2A CN201710424153A CN107215884A CN 107215884 A CN107215884 A CN 107215884A CN 201710424153 A CN201710424153 A CN 201710424153A CN 107215884 A CN107215884 A CN 107215884A
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- Prior art keywords
- waste water
- processing method
- water slag
- alkali
- aluminium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/34—Preparation of aluminium hydroxide by precipitation from solutions containing aluminium salts
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of processing method of alumina waste water slag, comprise the following steps：Aluminium waste water slag is dried；Dried aluminium waste water slag is added in alkali lye, heating is dissolved；20 25 DEG C are cooled to, aluminum hydroxide crystals are separated out；Filtering, reclaims alkali lye and crystal.The method that the present invention is provided, in the case of low energy consumption, low raw materials requirement, low emission, it is possible to the dissolving of aluminium waste water slag is recrystallized into the higher crystalline aluminum hydroxide of concentration, the production of aluminum oxide is can be applied to, meets economy, environmental friendly principle.
Description
Technical field
The present invention relates to a kind of three industrial wastes processing method, more particularly to a kind of processing method of alumina waste water slag.
Background technology
At present, aluminium industry can produce waste water in production process, and waste water can form substantial amounts of waste water after alkaline chemical precipitation
Slag.This kind of waste water slag has very big harm to human body because substantial amounts of aluminium ion is contained in the inside, so it is defined as danger by country
Dangerous discarded object.
The conventional processing method of aluminum current oxidized waste water slag makes landfill disposal.But also there are many enterprises to take and discharge factory steathily
Mode, so can greatly pollute environment.The moisture content that the difficulty in treatment of waste water slag also resides in it is very high, and it is reclaimed profit
With, it is necessary to be dried.Drying process can also expend the substantial amounts of energy, so that economic feasibility is not high.
Waste water slag is in addition to containing aluminium hydroxide, also containing substantial amounts of impurity, is limited the value that it is recycled, should
Scope is also limited.
The content of the invention
In order to overcome the deficiencies in the prior art, an object of the present invention is to provide a kind of processing cost low alumina
The processing method of waste water slag.
The purpose of the present invention adopts the following technical scheme that realization：
A kind of processing method of aluminium waste water slag, comprises the following steps：
Dry：Aluminium waste water slag is dried；
Alkali soluble：Dried aluminium waste water slag is added in alkali lye, heating is dissolved；The amount of adjustment alkali lye makes aluminium ion dense
Spend for 2-5mol/L；
Crystallisation by cooling：20-25 DEG C is cooled to, aluminum hydroxide crystals are separated out；
Separation：Filtering, reclaims alkali lye and crystal.
Further, in drying steps, it is dried using rotary furnace.
Further, in drying steps, the moisture for making aluminium waste water slag is 5-8%.
Further, in alkali soluble step, it is heated to 80-120 DEG C.
Further, in alkali soluble step, concentration hydroxy is 0.5-10mol/L in alkali lye.
Further, in alkali soluble step, the source of alkali lye is pot mould alkali, industrial lye or industrial sheet alkali.
Further, in crystallisation by cooling step, cooldown rate is 10-15 DEG C/h, is typically probably 3-4 hours.
Further, an insulation filtration step is additionally provided between alkali soluble step and crystallisation by cooling step, is removed insoluble miscellaneous
Matter.
Compared with prior art, the beneficial effects of the present invention are：
The method that the present invention is provided, in the case of low energy consumption, low raw materials requirement, low emission, it is possible to by aluminium waste water slag
Dissolving is recrystallized into the higher crystalline aluminum hydroxide of concentration, can be applied to the production of aluminum oxide, meets economy, environmental friendly principle.
Embodiment
Below, with reference to embodiment, the present invention is described further, it is necessary to which explanation is, what is do not collided
Under the premise of, new embodiment can be formed between various embodiments described below or between each technical characteristic in any combination.
The present invention provides a kind of processing method of aluminium waste water slag, comprises the following steps：
Dry：Aluminium waste water slag is dried；
In the step, by dry mode, most water in aluminium waste water slag can be removed, to ensure the alkali below
In molten and crystallisation step, purer crystallization can be separated out, and the recyclable cycle-index of alkali lye is more；More than the scope
Moisture, the concentration of alkali lye needed for the later stage is higher, and less than the moisture of the scope, it is necessary to consume in real process
Excessive energy, does not meet economy；In the step, drying mode can be using drying, during heated-air drying or rotary furnace dry
One or more combination；
Alkali soluble：Dried aluminium waste water slag is added in alkali lye, heating is dissolved；The amount of adjustment alkali lye contains aluminium ion
Measure as 2-5mol/L；
This step carries out alkali soluble to waste water slag, on the one hand removing can not alkali solubility impurity, the opposing party using the alkali lye reclaimed
Face is that waste water slag recrystallizes offer convenience；In order to improve the solvability of alkali lye again while being conducive to crystallization, generally need
Ensure that concentration hydroxy is 0.5-10mol/L in alkali lye；In the step, the source of the alkali in alkali lye can be pot mould alkali, work
Industry liquid caustic soda or industrial sheet alkali；
Crystallisation by cooling：20-25 DEG C is cooled to, aluminum hydroxide crystals are separated out；
In the step, by controlling cooldown rate, the higher aluminum hydroxide crystals of purity are can obtain.This kind of aluminium hydroxide crystalline substance
Body can be re-used for pyrolysis and produce aluminum oxide, the i.e. raw material applied to alumina producer, in aluminium processing industry inner loop.In order to analyse
Go out the crystalline aluminum hydroxide of good quality, cooldown rate control is ideal for 10-15 DEG C/h, and typical time is 3-4 hours；
Separation：Filtering, reclaims alkali lye and crystal.
In the step, alkali lye again reusable edible to alkali soluble step.
The processing method for the aluminium waste water slag that the present invention is provided, it can be returned by way of drying, alkali soluble and crystallisation by cooling
The aluminum hydroxide crystals for obtaining higher degree are received, can be using the raw materials for production of aluminum oxide be made, so that the sharp again of data can be realized
With.In the present invention, the required alkali lye source used is wider, and cost of material is more cheap.
Embodiment 1：
A kind of processing method of aluminium waste water slag, comprises the following steps：
Dry：Aluminium waste water slag is dried using rotary furnace drying, it is 8% to dry to moisture；
Alkali soluble：Dried aluminium waste water slag is added in alkali lye, being heated to 100 DEG C dissolves aluminium waste water slag；Hydrogen in alkali lye
Oxygen ion concentration is 4mol/L；Adding heat alkali liquid makes aluminium ion concentration be 4mol/L；
Crystallisation by cooling：Liquid after dissolving is incubated filtering while hot, 23 DEG C are cooled to 10 DEG C/h speed, hydrogen-oxygen is separated out
Change aluminium crystal；
Separation：Filtering, reclaims alkali lye and crystal.
In the present embodiment, in the crystal isolated, the high purity 99.3% of aluminium hydroxide.
Embodiment 2：
A kind of processing method of aluminium waste water slag, comprises the following steps：
Dry：Aluminium waste water slag is dried using rotary furnace drying, it is 10% to dry to moisture；
Alkali soluble：Dried aluminium waste water slag is added in alkali lye, being heated to 120 DEG C dissolves aluminium waste water slag；Hydrogen in alkali lye
Oxygen ion concentration is 3mol/L；Adding heat alkali liquid makes aluminium ion concentration be 5mol/L；
Crystallisation by cooling：Liquid after dissolving is incubated filtering while hot, 22 DEG C are cooled to 15 DEG C/h speed, hydrogen-oxygen is separated out
Change aluminium crystal；
Separation：Filtering, reclaims alkali lye and crystal.
In the present embodiment, in the crystal isolated, the high purity 99.1% of aluminium hydroxide.
Embodiment 3：
A kind of processing method of aluminium waste water slag, comprises the following steps：
Dry：Aluminium waste water slag is dried using rotary furnace drying, it is 5% to dry to moisture；
Alkali soluble：Dried aluminium waste water slag is added in alkali lye, being heated to 80 DEG C dissolves aluminium waste water slag；Hydrogen-oxygen in alkali lye
Ion concentration is 5mol/L；Adding heat alkali liquid makes aluminium ion concentration be 3mol/L；
Crystallisation by cooling：Liquid after dissolving is incubated filtering while hot, 25 DEG C are cooled to 13 DEG C/h speed, hydrogen-oxygen is separated out
Change aluminium crystal；
Separation：Filtering, reclaims alkali lye and crystal.
In the present embodiment, in the crystal isolated, the high purity 99.4% of aluminium hydroxide.
By embodiment 1-3, we can learn, the method provided using the application, and obtained aluminium waste water slag purity is high, can use
In the raw material of alumina producing, process meets the environmentally friendly and economic and environment-friendly principle of atom.
Above-mentioned embodiment is only the preferred embodiment of the present invention, it is impossible to limit the scope of protection of the invention with this,
The change and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed scope.
Claims (8)
1. a kind of processing method of aluminium waste water slag, comprises the following steps：
Dry：Aluminium waste water slag is dried；
Alkali soluble：Dried aluminium waste water slag is added in alkali lye, heating is dissolved；The amount of adjustment alkali lye makes the aluminium ion concentration be
2-5mol/L；
Crystallisation by cooling：20-25 DEG C is cooled to, aluminum hydroxide crystals are separated out；
Separation：Filtering, reclaims alkali lye and crystal.
2. processing method as claimed in claim 1, it is characterised in that in drying steps, is dried using rotary furnace.
3. processing method as claimed in claim 1, it is characterised in that in drying steps, the moisture for making aluminium waste water slag is
5-8%.
4. processing method as claimed in claim 1, it is characterised in that in alkali soluble step, be heated to 80-120 DEG C.
5. processing method as claimed in claim 1, it is characterised in that in alkali soluble step, concentration hydroxy is in alkali lye
0.5-10mol/L。
6. processing method as claimed in claim 1, it is characterised in that in alkali soluble step, the source of alkali lye is pot mould alkali, industry
Liquid caustic soda or industrial sheet alkali.
7. processing method as claimed in claim 1, it is characterised in that in crystallisation by cooling step, cooldown rate is 10-15 DEG C/
h。
8. processing method as claimed in claim 1, it is characterised in that be additionally provided with one between alkali soluble step and crystallisation by cooling step
Filtration step is incubated, insoluble impurities is removed.
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| CN201710424153.2A CN107215884A (en) | 2017-06-07 | 2017-06-07 | A kind of processing method of alumina waste water slag |
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| CN201710424153.2A CN107215884A (en) | 2017-06-07 | 2017-06-07 | A kind of processing method of alumina waste water slag |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629242A (en) * | 2009-08-19 | 2010-01-20 | 贾启 | Comprehensive process technology of solid waste in alumina plant |
| CN103030160A (en) * | 2012-12-11 | 2013-04-10 | 中国科学院过程工程研究所 | Method for recycling alumina and sodium oxide from bayer process red mud |
| CN102502733B (en) * | 2011-10-26 | 2013-06-12 | 中国铝业股份有限公司 | Method for treating gibbsite by using high-concentration alkali liquor under normal pressure |
| CN106032285A (en) * | 2015-03-13 | 2016-10-19 | 中国石油化工股份有限公司 | Method for recovering alumina |
-
2017
- 2017-06-07 CN CN201710424153.2A patent/CN107215884A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629242A (en) * | 2009-08-19 | 2010-01-20 | 贾启 | Comprehensive process technology of solid waste in alumina plant |
| CN102502733B (en) * | 2011-10-26 | 2013-06-12 | 中国铝业股份有限公司 | Method for treating gibbsite by using high-concentration alkali liquor under normal pressure |
| CN103030160A (en) * | 2012-12-11 | 2013-04-10 | 中国科学院过程工程研究所 | Method for recycling alumina and sodium oxide from bayer process red mud |
| CN106032285A (en) * | 2015-03-13 | 2016-10-19 | 中国石油化工股份有限公司 | Method for recovering alumina |
Non-Patent Citations (2)
| Title |
|---|
| A.M.施雷格: "《冶金学和金相学基础》", 29 February 1992 * |
| 杨昇等: "铝废渣废灰的治理", 《有色金属再生与利用》 * |
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