CN101734700A - Process for removing impurities in production of dry-method aluminum fluoride - Google Patents
Process for removing impurities in production of dry-method aluminum fluoride Download PDFInfo
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- CN101734700A CN101734700A CN200910242210A CN200910242210A CN101734700A CN 101734700 A CN101734700 A CN 101734700A CN 200910242210 A CN200910242210 A CN 200910242210A CN 200910242210 A CN200910242210 A CN 200910242210A CN 101734700 A CN101734700 A CN 101734700A
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Abstract
The invention provides a process for removing impurities in production of dry-method aluminum fluoride and belongs to the field of chemical engineering. A purifying system is used in the process; the purifying system comprises a gas inlet tube, a gas outlet tube, a purifying tower, a dust collecting device and a back-blowing device, wherein anhydrous hydrogen fluoride gas carrying a large amount of dust particles is generated by the reaction of fluorite and sulfuric acid in an acid making furnace and then enters the purifying tower through the gas inlet tube; the gas is filtered by film materials in the purifying tower and discharged by the gas outlet tube; and finally, the gas enters a fluidized bed to react with aluminum hydroxide to form the dry-method aluminum fluoride product, and in the impurity removing process, the product is blow-washed once every one to two hours by the back-blowing device, and the dust particles blown down are collected by the dust collecting device and then discharged from the bottom part of the purifying tower. The process has the advantages of low production cost, easy technological parameter control, convenient procedure operation, safety and environmental protection, industrialized continuous production and the like; and after the product of the dry-method aluminum fluoride undergoes the impurity removing process, the quality of the product of the dry-method aluminum fluoride meets all first-grade product indexes specified in national standards.
Description
Technical field
The invention belongs to chemical production technical field, be specifically related to the impurity removal process in a kind of aluminum fluoride by dry process production.
Background technology
Aluminum fluoride by dry process is mainly used in aluminum smelting industry as one of important inorganic fluoride product, is one of main fluoride salt solvent kind of Aluminum Electrolysis Production.In the prior art, the main production of aluminum fluoride by dry process is: at first adopt fluorite and sulfuric acid to produce the hydrogen fluoride gas that contains a large amount of dust by reaction in the relieving haperacidity stove, and then with sulfuric acid through purifying laggard aluminium hydroxide reaction of going into fluidized-bed and drying and dehydrating, thereby acquisition aluminum fluoride by dry process product.Because dry process is simple, reaction efficiency is higher, and this technology has become the main developing direction that China's aluminum fluoride is produced in recent years.But, for the lower fluorite ore deposit of grade, wherein each kind of impurity with the sulfuric acid reaction process in bring in the aluminium fluoride product by hydrogen fluoride gas inevitably, cause the difficult every index (according to the AF-1 level among standard GB/T4292-2007) that reaches the first grade of national regulation of aluminum fluoride by dry process quality product, especially can not satisfy that SiO2 content is not more than 0.30% in the aluminium fluoride product, P2O5 content is not more than 0.04% index.
In recent years, domestic relevant enterprise and scientific research group mainly adopt sulfuric acid scrubbing technology to reach SiO in the filtering aluminum fluoride by purifying anhydrous hydrogen fluoride gas
2With plurality of impurities such as iron, unclean but these production technique of result of study or equipment mainly exist dust granules in the hydrogen fluoride gas to remove, particularly for submicron and the small-particle below the nano level, decontamination effect improving is undesirable; The while complex process, production process is difficult to control.Patent CN201180092Y discloses a kind of purification process of hydrogen fluoride gas, be characterized in the conversion unit of producing hydrogen fluoride gas, inlet pipe end in carrying the sulfuric acid pipe, by shower nozzle is installed, reach impurity-eliminating effect, its shortcoming is to cause the inlet pipe frequent jams easily, and technological parameter fluctuation is bigger.Patent CN101139106A utilizes hydrogen fluoride gas and SiF
4The difference of condensation of gas point by the control condensing temperature, reaches desiliconization effect.But there is the energy consumption height in this method, causes environmental pollution easily, and can only remove and take off a kind of siliceous shortcomings such as dust granules.
Summary of the invention
For overcoming the prior art deficiency, mainly be the problem that removes at submicron in the anhydrous hydrogen fluoride gas and the following dust granules of nano level, the impurity removal process in a kind of aluminum fluoride by dry process production is provided.Be characterized in: the anhydrous hydrogen fluoride gas that carries a large amount of dust granules that in the relieving haperacidity stove, obtains by fluorite and sulfuric acid reaction, go into fluidized-bed and aluminium hydroxide reaction through impurity removal process is laggard, obtain the aluminum fluoride by dry process product.
This technology is to use a cover purification system.This purification system comprises intake ducting, outlet pipe, scavenging tower, dust collecting and back-blowing device; Intake ducting is positioned at the Lower Half of scavenging tower, and outlet pipe is positioned at the first half of scavenging tower; Place the ability temperature in the scavenging tower: the mould material of 20-100 ℃ and anti-negative pressure: 1000-3000MPa, the mould material hole is less than 1 μ m, and simultaneously, this mould material has hydrofluoric acid corrosion resistance, and the total specific surface area of all mould materials is greater than 180m
2/ g; The collection device upper end is connected with the scavenging tower bottom; Back-blowing device is positioned at the scavenging tower first half or top, and an end links to each other with scavenging tower, and the other end links to each other with air compressor machine.
Described mould material is selected from tetrafluoroethylene, polyvinylidene difluoride (PVDF), polysulfones, polycarbonate, polyethersulfone or sintered plate.
Impurity removal process during a kind of aluminum fluoride by dry process is produced is characterized in that: the anhydrous hydrogen fluoride gas that carries a large amount of dust granules that obtains by fluorite and sulfuric acid reaction in the relieving haperacidity stove enters scavenging tower through intake ducting; Filtering the back through the mould material in the scavenging tower is discharged by escape pipe; Enter the reaction of fluidized-bed and aluminium hydroxide at last, thereby obtain the aluminum fluoride by dry process product, in the impurity removal process operational process, every 1-2 hour by the back-blowing device purge once, the dust granules that institute's purge gets off is collected by dust collecting and is discharged from the scavenging tower bottom.
This impurity removal process has that production cost is low, and technical parameter is controlled easily, and operating mode is easy to operate, safety and environmental protection, can the mass-producing continuous production etc. advantage.After using this impurity removal process, all can be up to state standards every index (according to the AF-1 level among standard GB/T4292-2007) of first grade of defined of aluminum fluoride by dry process quality product.SiO in surveying aluminium fluoride product
2Content is not more than 0.30%, P
2O
5Content is not more than 0.04%.The dust granules size that is removed is between 200nm-500nm, and its composition is mainly by fluorine, silicon, phosphorus, iron, sulphur, compositions such as oxygen.
Description of drawings
Fig. 1: the impurity removal process schema during dry oxidation aluminium is produced
Fig. 2: the purification system structural representation in the dry oxidation aluminium production technique
1, scavenging tower;
2, intake ducting;
3, outlet pipe;
4, back-blowing device;
5, filtering material;
6, dust collecting
Embodiment
Adopt three grades of fluorites (according to fluorite mineral amount standard GB 5690-85) and oleum (mass concentration is 125%) in the relieving haperacidity stove, to produce the hydrogen fluoride gas that contains various impurity by reaction (reaction conditions commercial run routinely carries out), after importing impurity removal process, inlet pipe sends anhydrous hydrogen fluoride gas by the air outlet, enter fluidized-bed and aluminium hydroxide reaction (reaction conditions commercial run routinely carries out) at last, thereby obtain the aluminum fluoride by dry process product, its performance perameter is better than every index (according to the AF-1 level among standard GB/T4292-2007) of the first grade of national regulation.In the impurity removal process operational process, every 2 hours by the back-blowing device purge once, the purge time is 2 minutes, and the dust granules that institute's purge gets off is collected by dust collecting and discharged from the bottom.SiO in surveying aluminium fluoride product
2Content is not more than 0.30%, P
2O
5Content is not more than 0.04%.The impurity particle size that is removed is between 200nm-500nm, and its composition is mainly by fluorine, silicon, phosphorus, iron, sulphur, compositions such as oxygen.
In the impurity removal process filtering material performance perameter: temperature 20-100 ℃, negative pressure: 1000-3000Mpa, hydrofluoric acid corrosion resistance, the aperture is less than 1 μ m, and specific surface area is greater than 180m
2/ g.
Claims (2)
1. the impurity removal process during an aluminum fluoride by dry process is produced is characterized in that: this technology is to use following purification system; This purification system comprises intake ducting, outlet pipe, scavenging tower, dust collecting and back-blowing device; Intake ducting is positioned at the Lower Half of scavenging tower, and outlet pipe is positioned at the first half of scavenging tower; Place the ability temperature in the scavenging tower: the mould material of 20-100 ℃ and anti-negative pressure: 1000-3000MPa, the mould material aperture is less than 1 μ m, and simultaneously, this mould material has hydrofluoric acid corrosion resistance, and the total specific surface area of all mould materials is greater than 180m
2/ g; The collection device upper end is connected with the scavenging tower bottom; Back-blowing device is positioned at the scavenging tower first half or top, and an end links to each other with scavenging tower, and the other end links to each other with air compressor machine;
The anhydrous hydrogen fluoride gas that carries a large amount of dust granules that obtains by fluorite and sulfuric acid reaction in the relieving haperacidity stove enters scavenging tower through intake ducting; Filtering the back through the mould material in the scavenging tower is discharged by escape pipe; Enter the reaction of fluidized-bed and aluminium hydroxide at last, thereby obtain the aluminum fluoride by dry process product, in the impurity removal process operational process, every 1-2 hour by the back-blowing device purge once, the dust granules that institute's purge gets off is collected by dust collecting and is discharged from the scavenging tower bottom.
2. the impurity removal process during a kind of aluminum fluoride by dry process according to claim 1 is produced, it is characterized in that: described mould material is selected from tetrafluoroethylene, polyvinylidene difluoride (PVDF), polysulfones, polycarbonate, polyethersulfone or sintered plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910242210A CN101734700A (en) | 2009-12-04 | 2009-12-04 | Process for removing impurities in production of dry-method aluminum fluoride |
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| CN200910242210A CN101734700A (en) | 2009-12-04 | 2009-12-04 | Process for removing impurities in production of dry-method aluminum fluoride |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102180499A (en) * | 2011-03-24 | 2011-09-14 | 福州大学 | Process for producing dry aluminum fluoride from high-silicon acid-grade fluorite powder |
| CN102432053A (en) * | 2011-09-30 | 2012-05-02 | 北京工业大学 | Desilicication dephosphorization process used in process of producing aluminum fluoride by dry method |
| CN111485252A (en) * | 2020-04-10 | 2020-08-04 | 郑州于斯新创科技有限公司 | Dry method for treating fluorine-containing material for recycling |
-
2009
- 2009-12-04 CN CN200910242210A patent/CN101734700A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102180499A (en) * | 2011-03-24 | 2011-09-14 | 福州大学 | Process for producing dry aluminum fluoride from high-silicon acid-grade fluorite powder |
| CN102180499B (en) * | 2011-03-24 | 2012-10-17 | 福州大学 | Process for producing dry aluminum fluoride from high-silicon acid-grade fluorite powder |
| CN102432053A (en) * | 2011-09-30 | 2012-05-02 | 北京工业大学 | Desilicication dephosphorization process used in process of producing aluminum fluoride by dry method |
| CN111485252A (en) * | 2020-04-10 | 2020-08-04 | 郑州于斯新创科技有限公司 | Dry method for treating fluorine-containing material for recycling |
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Open date: 20100616 |