CN106673036A - Method for improving leaching rate of aluminum element by decomposing coal gangue through normal-pressure and low-temperature alkaline method - Google Patents
Method for improving leaching rate of aluminum element by decomposing coal gangue through normal-pressure and low-temperature alkaline method Download PDFInfo
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- CN106673036A CN106673036A CN201610545655.6A CN201610545655A CN106673036A CN 106673036 A CN106673036 A CN 106673036A CN 201610545655 A CN201610545655 A CN 201610545655A CN 106673036 A CN106673036 A CN 106673036A
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- China
- Prior art keywords
- gangue
- leaching rate
- coal gangue
- temperature alkaline
- aluminium element
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Classifications
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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
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/0693—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process from waste-like raw materials, e.g. fly ash or Bayer calcination dust
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/32—Alkali metal silicates
Abstract
The invention relates to a method for improving the leaching rate of an aluminum element by decomposing coal gangue through a normal-pressure and low-temperature alkaline method. A process is mainly characterized in that high-concentration NaOH alkali liquor is adopted to react at the temperature of 40 to 120DEG C and normal pressure, and thereby the leaching rate of aluminum in the coal gangue is improved, wherein the mass ratio of NaOH to the coal gangue is (2.5 to 10.5):1. Compared with a traditional hydrochloric acid method, a limestone sintering method, a limestone sintering method of alkali at normal pressure and the like, the method disclosed by the invention has the advantages of simple operation, low energy consumption, less environmental pollution, capability of efficiently utilizing aluminum resources in the coal gangue and the like. The method disclosed by the invention has important economic value and social benefits for relieving the demand quantity of aluminum oxide in China, solving the problems of treatment and utilization of the coal gangue, and guaranteeing sustainable development of economy and environment in China.
Description
Technical field
The present invention relates to a kind of process the method that gangue improves aluminium element leaching rate, a kind of NaOH highly basic is specifically related to
Liquid efficient-decomposition gangue aluminium element leaching rate under atmospheric low-temperature, the method for being easy to reclaim valuable element aluminum.
Background technology
Gangue is mixed with the organic compound and inorganic compound of coal co-deposition in coalification course
Rock, the main component of gangue is Al2O3、SiO2, the Fe also not waited containing quantity in addition2O3、CaO、MgO、Na2O、K2O、
P2O5、SO3With micro rare element (gallium, vanadium, titanium, cobalt).The utilization ways of gangue have brickmaking, generating, make the building such as building block
Material, replacement clay produce cement, produce micrometer level porous ceramics, production rubber reinforcing filler, produce mullite and cordierite, coal
Spoil is used for aggregate, backfill mine goaf or does paveio(u)r, gangue gas making, gangue production fertilizer, improvement
Soil, gangue extract chemical products, production infant industry filler (is used for foamed leather, thin film, mechanical rubber goods and painting
Material etc.), reclaim as frit and refractory material, coal gangue hill greening, spontaneous combustion of coal gangue hill heat energy utilization.
Domestic scholars have done many research work to gangue comprehensive utilizating research aspect, also achieve many stages
Achievement, proposes several technological processes such as hydrochloric acid method, limestone sintering process, soda lime sintering process in succession, but several sides above
Method because high energy consumption, pollute it is big the problems such as, at home without industrial applications.
At present, the comprehensive utilization of China's gangue just meets with challenge：On the one hand, gangue has been that China's discharge capacity is maximum
One of industrial solid castoff, the accumulation of gangue not only takes a large amount of soils, and sulfide contained in gangue is distributed
After can atmosphere pollution and water source, cause serious consequence；On the other hand, the aluminium oxide demand sustainable growth of China, though yield increases
Plus it is same very fast, but have insufficiency of supply-demand, domestic imbalance of supply and demand situation is still more serious, and this to also result in China more
There is certain import demand always to aluminium oxide over year.Therefore, develop the gangue New Process for Treatment of high-efficiency cleaning, increase to coal
The comprehensive utilization depth of spoil, for environmental conservation, solid waste comprehensive utilization is promoted, alleviation China bauxite resource is in short supply to be had
Very important meaning.
The content of the invention
Present invention is primarily aimed at providing alkaline process under a kind of atmospheric low-temperature decomposes the leaching rate that gangue improves element aluminum
Method, the method do not need high temperature dehydration roasting, and reaction temperature is low, and the response time is short, will not produce pollutant, and aluminium element
Extraction rate it is higher.
The present invention is achieved by the following technical solutions：
A kind of atmospheric low-temperature alkaline process decomposes the method that gangue improves aluminium element leaching rate, it is characterised in that methods described
Comprise the steps：
(1) dispensing：NaOH aqueous solution of the mass fraction for 20%-70% is added into normal pressure reactor, gangue is added,
NaOH is (2.5-10.5) with the mass ratio of gangue：1；
(2) react：The material that step (1) has been configured is reacted into 0.5-2h at 40-120 DEG C；
(3) filter：The serosity that step (2) reaction is obtained is incubated into filtration at 40-90 DEG C, the water using 40-90 DEG C is anti-
After multiple washing reaction slag phase, the leaching rate of aluminium element is tested.
Described gangue is managed：The black solid gangue of the block or powder less than 3mm.
Step 2) described in reaction temperature be 100 DEG C, the response time is 1.5h.
Step 1) described in NaOH solution concentration be 60wt%.
Step 2) course of reaction be mainly：
Al2O3·2SiO2·2H2O+6NaOH=2NaAlO2+2Na2SiO3+5H2O
SiO2+ 2NaOH=Na2SiO3+H2O。
Compared with prior art, the positive effect of the present invention is：
(1) method that the sodium hydroxide that the present invention is provided decomposes gangue, reaction pressure is normal pressure, and reaction temperature is 40-
120 DEG C, compared with traditional handicraft, operating condition is gentle, greatly reduces reaction temperature and reaction pressure, simple to operate and green
Efficiently, energy consumption is low, and environmental pollution is little.
(2) the aluminium element dissolution rate that the present invention is obtained may be up to more than 60%.
Specific embodiment
The present invention further illustrates the present invention with the following example, but protection scope of the present invention is not limited to following reality
Apply example.
Embodiment 1
The gangue sample that this example is adopted is block less than 3mm for Shanxi great Tu He coking company limited or powder is black
Color solid, it is mixed with heap ash method, drum process, is placed in after being dried 24h at 100 DEG C in exsiccator and is preserved；
(1) dispensing：It is by the mass fraction that 53.3mL water adds normal pressure reactor, NaOH solution together with 80gNaOH
60%, and will be reacted in 10g gangues addition normal pressure reactor；
(2) react：Controlling reaction temperature is 100 DEG C, and reaction pressure is normal pressure, and the response time is 90min, reaction stirring speed
Spend for 300r/min；
(3) filter：The reacting slurry that step (2) is obtained is incubated filtration at 90 DEG C, and the deionized water using 90 DEG C is anti-
Multiple washing reaction slag phase, is tested with inductively coupled plasma atomic emission (ICP) method, and aluminium element is obtained with this understanding
Leaching rate is about 66.72%.
Embodiment 2
The gangue sample that this example is adopted is block less than 3mm for Shanxi great Tu He coking company limited or powder is black
Color solid, it is mixed with heap ash method, drum process, is placed in after being dried 24h at 100 DEG C in exsiccator and is preserved；
(1) dispensing：55mL water is added into normal pressure reactor together with 55gNaOH, the mass fraction of NaOH solution is 50%,
And reacted 10g gangues addition normal pressure reactor；
(2) react：Controlling reaction temperature is 80 DEG C, and reaction pressure is normal pressure, and the response time is 60min, reaction stirring speed
Spend for 300r/min；
(3) filter：The reacting slurry that step (2) is obtained is incubated filtration at 80 DEG C, and the deionized water using 80 DEG C is anti-
Multiple washing reaction slag phase, is tested with inductively coupled plasma atomic emission (ICP) method, and aluminium element is obtained with this understanding
Leaching rate is about 48.73%.
Claims (4)
1. a kind of atmospheric low-temperature alkaline process decomposes the method that gangue improves aluminium element leaching rate, it is characterised in that methods described bag
Include following steps：
(1) dispensing：NaOH aqueous solution of the mass fraction for 20%-70% is added in normal pressure reactor, gangue is added,
NaOH is (2.5-10.5) with the mass ratio of gangue：1；
(2) react：The material that step (1) has been configured is reacted into 0.5-2h at 40-120 DEG C；
(3) filter：The serosity that step (2) reaction is obtained is incubated into filtration at 40-90 DEG C, is washed repeatedly using 40-90 DEG C of water
After washing reaction slag phase, the leaching rate of aluminium element is tested.
2. atmospheric low-temperature alkaline process as claimed in claim 1 decomposes the method that gangue improves aluminium element leaching rate, and its feature exists
In described gangue reason is the black solid gangue of the block or powder less than 3mm.
3. atmospheric low-temperature alkaline process as claimed in claim 1 decomposes the method that gangue improves aluminium element leaching rate, and its feature exists
In step 2) described in reaction temperature be 100 DEG C, the response time is 1.5h.
4. atmospheric low-temperature alkaline process as claimed in claim 1 decomposes the method that gangue improves aluminium element leaching rate, and its feature exists
In step 1) described in NaOH solution concentration be 60wt%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610545655.6A CN106673036A (en) | 2016-07-12 | 2016-07-12 | Method for improving leaching rate of aluminum element by decomposing coal gangue through normal-pressure and low-temperature alkaline method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610545655.6A CN106673036A (en) | 2016-07-12 | 2016-07-12 | Method for improving leaching rate of aluminum element by decomposing coal gangue through normal-pressure and low-temperature alkaline method |
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| CN201610545655.6A Pending CN106673036A (en) | 2016-07-12 | 2016-07-12 | Method for improving leaching rate of aluminum element by decomposing coal gangue through normal-pressure and low-temperature alkaline method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113104874A (en) * | 2021-03-31 | 2021-07-13 | 河南科技大学 | Full recycling method of high-aluminum coal gangue |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104140121A (en) * | 2013-05-09 | 2014-11-12 | 中国科学院过程工程研究所 | Method for preparing sodium aluminate solution from coal-series kaolinite or coal gangue used as raw material |
| CN104445314A (en) * | 2014-10-30 | 2015-03-25 | 北京矿冶研究总院 | Method for acid-base combined extraction of alumina from coal gangue or kaolinite minerals |
-
2016
- 2016-07-12 CN CN201610545655.6A patent/CN106673036A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104140121A (en) * | 2013-05-09 | 2014-11-12 | 中国科学院过程工程研究所 | Method for preparing sodium aluminate solution from coal-series kaolinite or coal gangue used as raw material |
| CN104445314A (en) * | 2014-10-30 | 2015-03-25 | 北京矿冶研究总院 | Method for acid-base combined extraction of alumina from coal gangue or kaolinite minerals |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113104874A (en) * | 2021-03-31 | 2021-07-13 | 河南科技大学 | Full recycling method of high-aluminum coal gangue |
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