CN105585298A - Method for comprehensive utilization on fly ash - Google Patents
Method for comprehensive utilization on fly ash Download PDFInfo
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- CN105585298A CN105585298A CN201410634436.6A CN201410634436A CN105585298A CN 105585298 A CN105585298 A CN 105585298A CN 201410634436 A CN201410634436 A CN 201410634436A CN 105585298 A CN105585298 A CN 105585298A
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- flyash
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
A method for comprehensive utilization on fly ash relates to the technical field of nonferrous metallurgy and especially relates to comprehensive utilization on the fly ash. The fly ash, as a main raw material, is employed for producing aluminum oxide, wherein residue generated during production is used for preparing materials for producing bricks. The method, which is wide in available range, is high-effective and is environment-friendly, for comprehensive utilization on the fly ash includes the following steps: 1) drying the fly ash in a drying column; 2) blending carbon powder, sodium carbonate and sodium hydroxide with the fly ash, and calcining the fly ash in a rotary kiln; 3) performing magnetic separation iron removal in a magnetic separation cabin to the calcined fly ash; 4) adding water to the fly ash after the iron removal to cool the fly ash, feeding the slurry to a stirring pot, stirring the slurry with addition of concentrated hydrochloric acid to regulate pH; 5) feeding the stirred slurry to a filter press to obtain aluminum chloride filtrate and a filter cake; and 6) drying the filter cake in the drying column, adding lime, cement and gypsum, and mixing the components uniformly in a blending cabin to obtain a mud billet, and burning the mud billet to obtain bricks in a kiln.
Description
Technical field
The present invention relates to non-ferrous metallurgy technology field, relate in particular to the comprehensive utilization to flyash, taking flyash as main material production aluminium oxide, the slag ingredient brickmaking in production process. The method can effectively be processed the existing Al of China2O3The flyash of content more than 15%.
Background technology
Shi Ge big coal country of China, taking coal as the basic fuel of power generation. The energy industry stable development of China, generating capacity annual growth is 7.3%, developing rapidly of power industry, bring the sharply increase of flyash discharge capacity, annual the discharged flyash total amount of Hazards in Power Plant increases year by year, along with the development of power industry, the flyash discharge capacity of coal-burning power plant increases year by year. Can cause river to silt up if enter water system, and toxic chemical substance wherein also can work the mischief to human body and biology.
China is again a country that per capita resource reserve is limited, the comprehensive utilization of flyash, turn waste into wealth, turn bane into boon, become an important techno-economic policy in China's economic construction, to solve China's power generation environmental pollution, the important means of contradiction between resource shortage is also one of task of solution that power generation faces.
A kind of method that flyash acid system produces aluminium oxide that Chinese invention patent application number is 201310746884.0 disclosure of the invention, the method comprises: step S1, flyash and solvent are mixed to get to original slurry, and original slurry is carried out to magnetic separation, filtration, obtain poor iron filter cake; Step S2, carries out poor iron filter cake acid-soluble, obtains wintercherry liquid; Step S3, carries out the separation of slag liquid by wintercherry liquid, obtains liquor alumini chloridi and residue; Step S4, carries out resin adsorption removal of impurities processing by liquor alumini chloridi, obtains refined crystalline aluminium chloride liquid; Step S5, carries out condensing crystallizing processing by refined crystalline aluminium chloride liquid, obtains crystal aluminum chloride and condensed water; And step S6, crystal aluminum chloride is calcined, obtain aluminium oxide. The deficiency of its existence is: acid system specific investment cost is high, and its equipment depreciation and financial expenses are also high, and the corrosivity of material improved its cost of overhaul, causes fixed cost high. Need very high temperature could promote reaction to carry out to the calcining of aluminium chloride, energy consumption is high.
The Chinese invention patent application number method of a kind of coal ash for manufacturing for aluminium oxide that be 201410037081.2 disclosure of the invention, is characterized in that: (1) by levigate flyash, agstone is levigate, adds alkali lye, polyvinyl alcohol water solution, carries out raw material granulation; (2) raw meal particulate is fired into grog, the firing time is 10-30min; Raw meal particulate is fired into grog and adopts two sections of method of temperature-control by, comprises low-temperature bake and high-temperature roasting, and low-temperature bake temperature is selected 350-400 DEG C, and high-temperature roasting temperature is selected 750-800 DEG C; (3) grog is carried out to alkali leaching, leach the adjustment liquid used of grog and form by leaching the washing lotion allotment of solid phase residue after grog, liquid-solid separation; (4) leachate is carried out, after desiliconization processing, carrying out isolated by filtration; (5) by liquid after the desiliconization filtering to isolate, carry out carbonating decomposition, obtain aluminium hydroxide; (6) roasting aluminium hydroxide obtains alumina product. The deficiency of its existence is: the key reaction time in technological process is longer, should not be used for suitability for industrialized production.
Chinese invention patent application number is 201410129308.6 disclosure of the invention, and a kind of ammonium salt dissolves and circulation ammonia process extracts the method for aluminium hydroxide from flyash, it is characterized in that, taking solubility ammonium salt and flyash as raw material, by flyash mechanical activation, flyash after activation is carried out in reactor with finite concentration ammonium salt solution to ammonia still process is reacted, heating, Separation of Solid and Liquid after cooling, blended liquid phase part is water miscible aluminium salt, molysite, titanium salt, magnesium salts, aluminium ammonium double salt, iron ammonium double salt etc. This mixed liquor is absorbed to the ammonia discharging in ammonia still process process, sink at a certain temperature reactive aluminum, Separation of Solid and Liquid, obtains the mixed hydroxides solid phase precipitation such as aluminium hydroxide, iron hydroxide, magnesium hydroxide, and liquid phase is ammonium salt solution. The deficiency of its existence is: alkali lye specific investment cost is high, and its equipment depreciation and financial expenses are also high, and the corrosivity of material improved its cost of overhaul, causes fixed cost high. And gained finished product is mixed hydroxides solid phase precipitation, separation difficulty.
Summary of the invention
The present invention is exactly for the problems referred to above, makes up the deficiencies in the prior art, and a kind of method of total utilization of PCA is provided, to solve utilization to fly ash and to regulate the production capacity of alumina industry.
For realizing above-mentioned purpose of the present invention, the present invention adopts following technical scheme.
The present invention includes following steps.
Step 1: fly ash in electric power plant, its Contents of Main Components is as follows.
| Composition (%) | SiO2 | Al2O3 | Fe2O3 | CaO |
| Scope | 30-45 | 15-60 | 1.5-6.5 | 0.5-10 |
Flyash is dried in drying tower to 30min-45min.
Step 2: allocate powdered carbon, sodium carbonate, NaOH in flyash, deliver to calcining in rotary kiln. Allocation ratio is flyash: powdered carbon: sodium carbonate: NaOH=10:1-1.5:2-2.5:1.5-2, and in rotary kiln, calcining heat is 1250 DEG C-1450 DEG C, calcination time is 1.5-2h.
Step 3: the flyash after calcining is delivered to magnetic separation storehouse and carry out iron removal by magnetic separation.
Step 4: the flyash after deironing is added to water cooling, and additional proportion is flyash: water=1:10, and the slurries after adding water are delivered to agitator tank, opens and stirs and add concentrated hydrochloric acid, regulates pH value 3.0-4.5, continues to stir 1h.
Step 5: the slurries after stirring are delivered to filter press, obtain liquor alumini chloridi and filter cake. Liquor alumini chloridi can be directly used in aluminum oxide industry.
Step 6: filter cake is dried in drying tower to 30min, retain moisture in 10% left and right, add lime, cement, gypsum. Additional proportion is filter cake: lime: cement: gypsum=50-60:15-20:5-10:0.1 makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln after batch bin mixes.
Compared with prior art beneficial effect of the present invention.
(1) flow process is simple, and applicability is strong: total utilization of PCA method of the present invention is applicable to China's each place fly ash in electric power plant, and adopts the method for calcining, acidleach, and flow process is simple.
(2) environmental protection: adopt the method for total utilization of PCA of the present invention, integrate the generation of production process without waste gas, waste material, all raw materials, tailing are all fully utilized.
Detailed description of the invention
Choose the flyash of three kinds of different grades, use respectively the inventive method processing.
Embodiment 1: the flyash of Shanxi power plant is tested by the inventive method.
Step 1: fly ash in electric power plant, its Contents of Main Components is as follows:
| Composition (%) | SiO2 | Al2O3 | Fe2O3 | CaO |
| Scope | 31.2 | 56.3 | 3.5 | 5.2 |
Flyash is dried in drying tower to 30min.
Step 2: allocate powdered carbon, sodium carbonate, NaOH in flyash, deliver to calcining in rotary kiln. Allocation ratio is flyash: powdered carbon: sodium carbonate: NaOH=10:1:2.5:2, and in rotary kiln, calcining heat is 1300 DEG C, calcination time is 1.5h.
Step 3: the flyash after calcining is delivered to magnetic separation storehouse and carry out iron removal by magnetic separation.
Step 4: the flyash after deironing is added to water cooling, and additional proportion is flyash: water=1:10, and the slurries after adding water are delivered to agitator tank, opens and stirs and add concentrated hydrochloric acid, regulates pH value 3.0, continues to stir 1h.
Step 5: the slurries after stirring are delivered to filter press, obtain liquor alumini chloridi and filter cake. Liquor alumini chloridi can be directly used in aluminum oxide industry.
Step 6: filter cake is dried in drying tower to 30min, retain moisture in 10% left and right, add lime, cement, gypsum. Additional proportion is filter cake: lime: cement: gypsum=55:17:8:0.1 makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln after batch bin mixes.
Embodiment 2: Liaoning fly ash in electric power plant is tested by the inventive method.
Step 1: fly ash in electric power plant, its Contents of Main Components is as follows:
| Composition (%) | SiO2 | Al2O3 | Fe2O3 | CaO |
| Scope | 38.2 | 44.5 | 5.3 | 1.3 |
Flyash is dried in drying tower to 45min.
Step 2: allocate powdered carbon, sodium carbonate, NaOH in flyash, deliver to calcining in rotary kiln. Allocation ratio is flyash: powdered carbon: sodium carbonate: NaOH=10:1.5:2:1.5, and in rotary kiln, calcining heat is 1250 DEG C, calcination time is 1.5h.
Step 3: the flyash after calcining is delivered to magnetic separation storehouse and carry out iron removal by magnetic separation.
Step 4: the flyash after deironing is added to water cooling, and additional proportion is flyash: water=1:10, and the slurries after adding water are delivered to agitator tank, opens and stirs and add concentrated hydrochloric acid, regulates pH value 3.5, continues to stir 1h.
Step 5: the slurries after stirring are delivered to filter press, obtain liquor alumini chloridi and filter cake. Liquor alumini chloridi can be directly used in aluminum oxide industry.
Step 6: filter cake is dried in drying tower to 30min, retain moisture in 10% left and right, add lime, cement, gypsum. Additional proportion is filter cake: lime: cement: gypsum=50:15:10:0.1 makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln after batch bin mixes.
Embodiment 3: Henan fly ash in electric power plant is tested by the inventive method.
Step 1: fly ash in electric power plant, its Contents of Main Components is as follows:
| Composition (%) | SiO2 | Al2O3 | Fe2O3 | CaO |
| Scope | 44.6 | 35.3 | 1.8 | 3.6 |
Flyash is dried in drying tower to 45min.
Step 2: allocate powdered carbon, sodium carbonate, NaOH in flyash, deliver to calcining in rotary kiln. Allocation ratio is flyash: powdered carbon: sodium carbonate: NaOH=10:1.3:2.2:1.6, and in rotary kiln, calcining heat is 1450 DEG C, calcination time is 2h.
Step 3: the flyash after calcining is delivered to magnetic separation storehouse and carry out iron removal by magnetic separation.
Step 4: the flyash after deironing is added to water cooling, and additional proportion is flyash: water=1:10, and the slurries after adding water are delivered to agitator tank, opens and stirs and add concentrated hydrochloric acid, regulates pH value 4.5, continues to stir 1h.
Step 5: the slurries after stirring are delivered to filter press, obtain liquor alumini chloridi and filter cake. Liquor alumini chloridi can be directly used in aluminum oxide industry.
Step 6: filter cake is dried in drying tower to 30min, retain moisture in 10% left and right, add lime, cement, gypsum. Additional proportion is filter cake: lime: cement: gypsum=58:20:10:0.1 makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln after batch bin mixes.
Claims (4)
1. a method for total utilization of PCA, is characterized in that,
Step 1: fly ash in electric power plant, its Contents of Main Components is as follows:
Flyash is dried in drying tower to 30min-45min;
Step 2: allocate powdered carbon, sodium carbonate, NaOH in flyash into, deliver to calcining in rotary kiln, allocation ratio is flyash: powdered carbon: sodium carbonate: NaOH=10:1-1.5:2-2.5:1.5-2, and in rotary kiln, calcining heat is 1250 DEG C-1450 DEG C, calcination time is 1.5-2h;
Step 3: the flyash after calcining is delivered to magnetic separation storehouse and carry out iron removal by magnetic separation;
Step 4: the flyash after deironing is added to water cooling, and additional proportion is flyash: water=1:10, and the slurries after adding water are delivered to agitator tank, opens and stirs and add concentrated hydrochloric acid, regulates pH value 3.0-4.5, continues to stir 1h;
Step 5: the slurries after stirring are delivered to filter press, obtain liquor alumini chloridi and filter cake;
Step 6: filter cake is dried in drying tower to 30min, retain moisture in 10% left and right, add lime, cement, gypsum; Additional proportion is filter cake: lime: cement: gypsum=50-60:15-20:5-10:0.1 makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln after batch bin mixes.
2. the method for a kind of total utilization of PCA as claimed in claim 1, is characterized in that: the flyash of Shanxi power plant is tested by the inventive method;
Step 1: fly ash in electric power plant, its Contents of Main Components is as follows:
Flyash is dried in drying tower to 30min;
Step 2: allocate powdered carbon, sodium carbonate, NaOH in flyash, deliver to calcining in rotary kiln, allocation ratio is flyash: powdered carbon: sodium carbonate: NaOH=10:1:2.5:2, in rotary kiln, calcining heat is 1300 DEG C, calcination time is 1.5h;
Step 3: the flyash after calcining is delivered to magnetic separation storehouse and carry out iron removal by magnetic separation;
Step 4: the flyash after deironing is added to water cooling, and additional proportion is flyash: water=1:10, and the slurries after adding water are delivered to agitator tank, opens and stirs and add concentrated hydrochloric acid, regulates pH value 3.0, continues to stir 1h;
Step 5: the slurries after stirring are delivered to filter press, obtain liquor alumini chloridi and filter cake;
Step 6: filter cake is dried in drying tower to 30min, retain moisture in 10% left and right, add lime, cement, gypsum; Additional proportion is filter cake: lime: cement: gypsum=55:17:8:0.1 makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln after batch bin mixes.
3. the method for a kind of total utilization of PCA as claimed in claim 2, is characterized in that: Liaoning fly ash in electric power plant is tested by the inventive method;
Step 1: fly ash in electric power plant, its Contents of Main Components is as follows:
Flyash is dried in drying tower to 45min;
Step 2: allocate powdered carbon, sodium carbonate, NaOH in flyash, deliver to calcining in rotary kiln, allocation ratio is flyash: powdered carbon: sodium carbonate: NaOH=10:1.5:2:1.5, in rotary kiln, calcining heat is 1250 DEG C, calcination time is 1.5h;
Step 3: the flyash after calcining is delivered to magnetic separation storehouse and carry out iron removal by magnetic separation;
Step 4: the flyash after deironing is added to water cooling, and additional proportion is flyash: water=1:10, and the slurries after adding water are delivered to agitator tank, opens and stirs and add concentrated hydrochloric acid, regulates pH value 3.5, continues to stir 1h;
Step 5: the slurries after stirring are delivered to filter press, obtain liquor alumini chloridi and filter cake;
Step 6: filter cake is dried in drying tower to 30min, retain moisture in 10% left and right, add lime, cement, gypsum; Additional proportion is filter cake: lime: cement: gypsum=50:15:10:0.1 makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln after batch bin mixes.
4. the method for a kind of total utilization of PCA as claimed in claim 1, is characterized in that: Henan fly ash in electric power plant is tested by the inventive method;
Step 1: fly ash in electric power plant, its Contents of Main Components is as follows:
Flyash is dried in drying tower to 45min;
Step 2: allocate powdered carbon, sodium carbonate, NaOH in flyash, deliver to calcining in rotary kiln, allocation ratio is flyash: powdered carbon: sodium carbonate: NaOH=10:1.3:2.2:1.6, in rotary kiln, calcining heat is 1450 DEG C, calcination time is 2h;
Step 3: the flyash after calcining is delivered to magnetic separation storehouse and carry out iron removal by magnetic separation;
Step 4: the flyash after deironing is added to water cooling, and additional proportion is flyash: water=1:10, and the slurries after adding water are delivered to agitator tank, opens and stirs and add concentrated hydrochloric acid, regulates pH value 4.5, continues to stir 1h;
Step 5: the slurries after stirring are delivered to filter press, obtain liquor alumini chloridi and filter cake;
Step 6: filter cake is dried in drying tower to 30min, retain moisture in 10% left and right, add lime, cement, gypsum, additional proportion is filter cake: lime: cement: gypsum=58:20:10:0.1 makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln after batch bin mixes.
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| CN201410634436.6A CN105585298A (en) | 2014-11-13 | 2014-11-13 | Method for comprehensive utilization on fly ash |
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| CN201410634436.6A CN105585298A (en) | 2014-11-13 | 2014-11-13 | Method for comprehensive utilization on fly ash |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107814401A (en) * | 2017-12-08 | 2018-03-20 | 西安科技大学 | The method that aluminum oxide is extracted from flyash |
| CN108545781A (en) * | 2018-07-03 | 2018-09-18 | 贵州大学 | A kind of comprehensive utilization process of high-sulfur bauxite and ardealite |
| CN114940507A (en) * | 2022-06-22 | 2022-08-26 | 神华准能资源综合开发有限公司 | Method for extracting alumina from fly ash |
| CN115571864A (en) * | 2022-09-05 | 2023-01-06 | 六盘水师范学院 | Method for preparing battery-grade iron phosphate by using high-iron type fly ash as raw material |
-
2014
- 2014-11-13 CN CN201410634436.6A patent/CN105585298A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107814401A (en) * | 2017-12-08 | 2018-03-20 | 西安科技大学 | The method that aluminum oxide is extracted from flyash |
| CN108545781A (en) * | 2018-07-03 | 2018-09-18 | 贵州大学 | A kind of comprehensive utilization process of high-sulfur bauxite and ardealite |
| CN114940507A (en) * | 2022-06-22 | 2022-08-26 | 神华准能资源综合开发有限公司 | Method for extracting alumina from fly ash |
| CN114940507B (en) * | 2022-06-22 | 2023-11-14 | 神华准能资源综合开发有限公司 | Method for extracting alumina from fly ash |
| CN115571864A (en) * | 2022-09-05 | 2023-01-06 | 六盘水师范学院 | Method for preparing battery-grade iron phosphate by using high-iron type fly ash as raw material |
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Application publication date: 20160518 |
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