CN103145165A - Method for carbonation decomposition with clinker kiln tail gas - Google Patents
Method for carbonation decomposition with clinker kiln tail gas Download PDFInfo
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- CN103145165A CN103145165A CN201310007554XA CN201310007554A CN103145165A CN 103145165 A CN103145165 A CN 103145165A CN 201310007554X A CN201310007554X A CN 201310007554XA CN 201310007554 A CN201310007554 A CN 201310007554A CN 103145165 A CN103145165 A CN 103145165A
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- tail gas
- carbonating
- decomposing
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Abstract
The invention provides a method for carbonation decomposition with clinker kiln tail gas. The method comprises the following steps: preprocessing of dust extraction and wash is performed to the clinker kiln tail gas in sequence and CO2 gas is collected; the obtained CO2 gas is pressed and added in feed liquid containing sodium aluminate for primary carbonation decomposing until the potential of hydrogen (pH) of the feed liquid is 9.7-10.6 and solid-liquid separation is performed to the feed liquid after the primary carbonation decomposing; and the pressed CO2 gas obtained by the preprocessing is added continuously to filtrate after the primary carbonation decomposing for secondary carbonation decomposing until the pH of the feed liquid is 9.0-9.8 and precipitate is collected. According to the method for the carbonation decomposing with the clinker kiln tail gas, the secondary carbonation decomposing is performed to sodium aluminate solution obtained by comprehensive utilization of the clinker kiln tail gas to high-alumina fly ash so that the problem of pollution caused by clinker kiln tail gas discharged into environment and greenhouse effect caused by the clinker kiln tail gas discharged into the air in large amount can be solved. Meanwhile aluminum and gallium in the sodium aluminate solution is comprehensively recovered and resource use efficiency is further improved.
Description
Technical field
The present invention relates to a kind of grog kiln tail gas that utilizes and carry out the method that carbonating is decomposed, belong to total utilization of PCA production aluminum oxide and waste gas and fully utilize the field.
Background technology
Due to special geologic background, contain the rich aluminium minerals such as abundant kaolinite and boehmite in China's Late Paleozoic In The Ordos Basin coal seam and dirt band, in its components of coal ash, alumina content surpasses 40%, and the valuable elements such as Sync enrichment gallium have very important value of exploiting and utilizing.Only high alumina coal in Zhungeer coal field has been verified 267.6 hundred million tons of geologic reserve, and oxygen content of coal aluminium content is 10-13%, and the standing stock of potential aluminous fly-ash reach 7,000,000,000 tons, is equivalent to 3 times of China's bauxite retained reserve; 860,000 tons of the standing stock of gallium account for more than 80% of world's gallium proven reserve.Therefore, the Zhungeer coal field is rare both at home and abroad coal-aluminium-compound mineral products of gallium, has extremely important comprehensive utilization value and DEVELOPMENT PROSPECT.
DaTang International poer Co., Ltd has developed pre-desiliconizing with China's independent intellectual property right-soda-lime method technique, take high alumina coal (flyash) as raw material, produces the byproducts such as aluminum oxide and active calcium silicate, gallium.In this process, CO
2Gas is absolutely necessary, and it is mainly used in the substep carbonation decomposition course of sodium aluminate solution, and the pH difference that namely begins with gallium hydroxide according to aluminium hydroxide to separate out in basic solution is separated aluminium plus gallium.The unstripped gas that tradition is used for the decomposition of sodium aluminate carbonating comes from the CO that produces after the Wingdale pyrolytic decomposition
2, by the CO of the method generation
2Volume fraction higher (being about 22-41%), carrying out the sodium aluminate carbonating when decomposing, have advantages of that the resolving time is short, speed fast, to decompose production capacity high; But also the granularity of existence generation aluminium hydroxide is little simultaneously, intensity is little and be mixed with the many shortcomings of impurity.
Meanwhile, in pre-desiliconizing-soda-lime method aluminum oxide production process, a large amount of volume fractions that alumina rotary kiln produces are the CO of 10-15%
2Emitted endlessly.A large amount of CO
2Gas purging has not only brought very large harm to environment, causes serious Greenhouse effect, and has brought the significant wastage of resource.
Summary of the invention
The purpose of this invention is to provide a kind of grog kiln tail gas that utilizes and carry out the method that carbonating is decomposed, by utilizing grog kiln tail gas lower concentration CO after treatment
2Gas carries out carbonating and decomposes, thereby makes the granularity of aluminium hydroxide of generation large, intensity is large, impurity level is few, has effectively overcome use Wingdale pyrolytic decomposition and has generated CO
2Carry out the defective that carbonating is decomposed, moreover, also overcome Greenhouse effect that the excessive emissions of grog kiln tail gas causes and the significant wastage of resource.
The invention provides a kind of grog kiln tail gas that utilizes and carry out the method that carbonating is decomposed, comprise the following steps:
After grog kiln tail gas is implemented dedusting, washing pre-treatment successively, collect and obtain CO
2Gas;
The CO that above-mentioned pre-treatment is obtained
2Gas pressurization is passed into to the 0.06-0.30MPa carries out the pH9.7-10.6 that carbonating decomposes to feed liquid in the feed liquid that contains sodium aluminate, the feed liquid after this carbonating is decomposed is carried out solid-liquid separation, respectively collecting precipitation and filtrate;
The CO that above-mentioned pre-treatment is obtained
2Gas pressurization continues to pass in the filtrate of a carbonating decomposition to 0.06-0.30MPa, and implement the secondary carbonating and decompose, to the pH9.0-9.8 of feed liquid, the collecting precipitation thing;
Wherein, described grog kiln tail gas contains the CO that volume fraction is 10-15%
2, the Al in the described feed liquid that contains sodium aluminate
2O
3Concentration is 80-115g/L.
Further, in carbonation decomposition course, control carbonating resolving time 5-10h, decomposition temperature 70-80 ℃; In the secondary carbonation decomposition course, control carbonating resolving time 3-7h, decomposition temperature 40-70 ℃.
Further, dust removal process to described grog kiln tail gas is specially: described grog kiln tail gas is undertaken sending into the washing link after dedusting by vertical flue, tornado dust collector, electrostatic precipitator successively process, and the kiln ash of respectively tornado dust collector and electrostatic precipitator being collected is sent back in chamotte kiln and recycled.
Further, from chamotte kiln by vertical flue dedusting after, tail gas pressure is-50 to-250Pa, temperature is 200-265 ℃, dustiness is 200 * 10
3To 250 * 10
3Mg/m
3
Further, after the tornado dust collector dedusting, tail gas pressure is-280 to-420Pa, and temperature is 180-230 ℃, and dustiness is 19.3 * 10
3To 25.6 * 10
3Mg/m
3
Further, after the electrostatic precipitator dedusting, tail gas pressure is-680 to-850Pa, and temperature is 150-200 ℃, and dustiness is 50 to 100mg/m
3
Further, the water washing process after described grog kiln tail gas dedusting is specially: will carry out grog kiln tail gas after dedusting by vertical flue, tornado dust collector, electrostatic precipitator and send in spray column and wash.
Further, after processing by washing, tail gas pressure is 1.01 * 10
5Pa, temperature is 10-40 ℃, dustiness is 10 to 30mg/m
3
Further, the solution that obtains after stripping of the grog that generates after from pre-desiliconizing with high alumina fly ash soda-lime sintering of the described feed liquid that contains sodium aluminate.
Further, decompose the throw out that obtains for the preparation of aluminum oxide through carbonating, decompose the throw out that obtains for the preparation of the gallium product through the secondary carbonating.
Compared with prior art, technical scheme of the present invention has following beneficial effect:
1, carry out the carbonating decomposition of sodium aluminate than the tail gas that utilizes the Wingdale high-temperature calcination to produce, utilization of the present invention contains the CO of 10-15%
2Grog kiln tail gas carry out carbonating and decompose and to have overcome the defective that hydroxide particle-size is little, intensity is little, foreign matter content is many that generates.
2, carry out the carbonating decomposition of sodium aluminate than the tail gas that utilizes the Wingdale high-temperature calcination to produce, the present invention fully utilizes grog kiln tail gas, has solved pre-desiliconizing with high alumina fly ash-soda-lime sintering process and has produced the grog kiln tail gas that produces in alumina process to the pollution of environment and be discharged in a large number the Greenhouse effect problem that causes in air.
3, carry out the carbonating decomposition of sodium aluminate than the tail gas that utilizes the Wingdale high-temperature calcination to produce, temperature and time and Al (OH) that the present invention decomposes by controlling the secondary carbonating
3With Ga (OH)
3The pH scope of separating out in sodium aluminate solution is different, and employing secondary carbonating decomposition method comprehensively reclaims the aluminium plus gallium in sodium aluminate solution, further improves the level of resources utilization.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the present invention is clearer, the below is clearly and completely described the technical scheme in the embodiment of the present invention, and obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment 1
A kind of grog kiln tail gas that utilizes carries out the method that carbonating is decomposed, and concrete grammar is as follows:
1) will contain volume fraction is 12% CO
2Grog kiln tail gas by vertical flue dedusting after, tail gas pressure is-50Pa, temperature is 200 ℃, dustiness is 200 * 10
3Mg/m
3
2) tail gas after step 1) is processed is by after the tornado dust collector dedusting, and tail gas pressure is-280Pa, and temperature is 180 ℃, and dustiness is 19.3 * 10
3Mg/m
3
3) with step 2) tail gas after processing is by after the electrostatic precipitator dedusting, and tail gas pressure is-680Pa, and temperature is 150 ℃, and dustiness is 50mg/m
3
4) after the tail gas after step 3) is processed was processed by washing, tail gas pressure was 1.01 * 10
5Pa, temperature is 10 ℃, dustiness is 10mg/m
3
5) after the pressure treatment to the tail gas enforcement 0.10Mpa after the washing processing, pass into to Al
2O
3Concentration is to carry out a carbonating in the sodium aluminate feed liquid of 100g/L to decompose, and in carbonation decomposition course, controls 70 ℃ of carbonating decomposition temperatures, and the resolving time is 8h, the pH=10.0 of feed liquid after decompose, filtering separation Al (OH)
3Precipitation, Al (OH)
3Filter cake (composition sees Table 1) is sent to the decomposition of crystal seed operation in order to preparing aluminum oxide, continues to pass into the CO that implements the volume fraction 12% of 0.10Mpa pressurization after pre-treatment in the filtrate
2Grog kiln tail gas is implemented the secondary carbonating and is decomposed, and controls 50 ℃ of carbonating decomposition temperatures, resolving time 4h, the pH=9.5 of feed liquid after extremely decomposing, filtering separation Ga (OH)
3Precipitation, Ga (OH)
3Filter cake is sent to next process in order to prepare the gallium product.
The impact of table 1. carbonating decomposition method on the aluminium hydroxide quality
Embodiment 2
A kind of grog kiln tail gas that utilizes carries out the method that carbonating is decomposed, and concrete grammar is as follows:
1) will contain volume fraction is 14% CO
2Grog kiln tail gas by vertical flue dedusting after, tail gas pressure is-250Pa, temperature is 265 ℃, dustiness is 250 * 10
3Mg/m
3
2) with step 1) tail gas after processing is by after the tornado dust collector dedusting, and tail gas pressure is-420Pa, and temperature is 230 ℃, and dustiness is 25.6 * 10
3Mg/m
3
3) with step 2) tail gas after processing is by after the electrostatic precipitator dedusting, and tail gas pressure is-850Pa, and temperature is 200 ℃, and dustiness is 100mg/m
3
4) with after the tail gas washing processing after the step 3) processing, tail gas pressure is 1.01 * 10
5Pa, temperature is 40 ℃, dustiness is 30mg/m
3
5) after the pressure treatment to the tail gas enforcement 0.30Mpa after the washing processing, pass into to Al
2O
3Concentration is to carry out a carbonating in the sodium aluminate feed liquid of 110g/L to decompose, and in carbonation decomposition course, controls 80 ℃ of carbonating decomposition temperatures, and the resolving time is 9h, the pH=9.8 of feed liquid after decompose, filtering separation Al (OH)
3Precipitation, Al (OH)
3Filter cake (composition sees Table 2) is sent to the decomposition of crystal seed operation in order to preparing aluminum oxide, continues to pass into the CO that implements the volume fraction 12% of 0.10Mpa pressurization after pre-treatment in the filtrate
2Grog kiln tail gas is implemented the secondary carbonating and is decomposed, and controls 40 ℃ of carbonating decomposition temperatures, resolving time 3h, the pH=9.7 of feed liquid after extremely decomposing, filtering separation Ga (OH)
3Precipitation, Ga (OH)
3Filter cake is sent to next process in order to prepare the gallium product.
The impact of table 2. carbonating decomposition method on the aluminium hydroxide quality
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. one kind is utilized grog kiln tail gas to carry out the method that carbonating is decomposed, and it is characterized in that, comprises the following steps:
After grog kiln tail gas is implemented dedusting, washing pre-treatment successively, collect and obtain CO
2Gas;
The CO that above-mentioned pre-treatment is obtained
2Gas pressurization is passed into to the 0.06-0.30MPa carries out the pH9.7-10.6 that carbonating decomposes to feed liquid in the feed liquid that contains sodium aluminate, the feed liquid after this carbonating is decomposed is carried out solid-liquid separation, respectively collecting precipitation and filtrate;
The CO that above-mentioned pre-treatment is obtained
2Gas pressurization continues to pass in the filtrate of a carbonating decomposition to 0.06-0.30MPa, and implement the secondary carbonating and decompose, to the pH9.0-9.8 of feed liquid, the collecting precipitation thing;
Wherein, described grog kiln tail gas contains the CO that volume fraction is 10-15%
2, the Al in the described feed liquid that contains sodium aluminate
2O
3Concentration is 80-115g/L.
2. the carbonating according to claim 1 method of decomposing, is characterized in that, in carbonation decomposition course, controls carbonating resolving time 5-10h, decomposition temperature 70-80 ℃; In the secondary carbonation decomposition course, control carbonating resolving time 3-7h, decomposition temperature 40-70 ℃.
3. the carbonating according to claim 1 method of decomposing, it is characterized in that, dust removal process to described grog kiln tail gas is specially: described grog kiln tail gas is undertaken sending into the washing link after dedusting by vertical flue, tornado dust collector, electrostatic precipitator successively process, and the kiln ash of respectively tornado dust collector and electrostatic precipitator being collected is sent back in chamotte kiln and recycled.
4. the carbonating according to claim 3 method of decomposing, is characterized in that, from chamotte kiln by vertical flue dedusting after, tail gas pressure is-50 to-250Pa, temperature is 200-265 ℃, dustiness is 200 * 10
3To 250 * 10
3Mg/m
3
5. the carbonating according to claim 3 method of decomposing, is characterized in that, after the tornado dust collector dedusting, tail gas pressure is-280 to-420Pa, and temperature is 180-230 ℃, and dustiness is 19.3 * 10
3To 25.6 * 10
3Mg/m
3
6. the carbonating according to claim 3 method of decomposing, is characterized in that, after the electrostatic precipitator dedusting, tail gas pressure is-680 to-850Pa, and temperature is 150-200 ℃, and dustiness is 50 to 100mg/m
3
7. the carbonating according to claim 1 method of decomposing, it is characterized in that, the water washing process after described grog kiln tail gas dedusting is specially: will carry out grog kiln tail gas after dedusting by vertical flue, tornado dust collector, electrostatic precipitator and send in spray column and wash.
8. the method for carbonating decomposition according to claim 7, is characterized in that, after processing by washing, tail gas pressure is 1.01 * 10
5Pa, temperature is 10-40 ℃, dustiness is 10 to 30mg/m
3
9. the carbonating according to claim 1 method of decomposing, is characterized in that, the solution that the grog that the described feed liquid that contains sodium aluminate generates after from pre-desiliconizing with high alumina fly ash soda-lime sintering obtains after stripping.
10. the carbonating according to claim 1 method of decomposing, is characterized in that, decomposes the throw out that obtains for the preparation of aluminum oxide through carbonating, decomposes the throw out that obtains for the preparation of the gallium product through the secondary carbonating.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113620327A (en) * | 2021-08-06 | 2021-11-09 | 中国铝业股份有限公司 | Small-grain pseudo-boehmite, preparation method thereof and alumina |
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2013
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|---|---|---|---|---|
| CN113620327A (en) * | 2021-08-06 | 2021-11-09 | 中国铝业股份有限公司 | Small-grain pseudo-boehmite, preparation method thereof and alumina |
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Inventor after: Yan Shaoyong Inventor after: Zhang Xianqi Inventor after: Zhang Tingan Inventor after: Xin Weidong Inventor after: Lv Guozhi Inventor after: Zhang Chengwei Inventor after: Wang Lijuan Inventor after: Zhao Dahu Inventor after: Du Xiaorong Inventor before: Yan Shaoyong Inventor before: Zhang Xianqi |
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