CN109925795B - Method for cleaning filter pipe of hydrofluorination fluidized bed in uranium conversion - Google Patents
Method for cleaning filter pipe of hydrofluorination fluidized bed in uranium conversion Download PDFInfo
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- CN109925795B CN109925795B CN201711366430.5A CN201711366430A CN109925795B CN 109925795 B CN109925795 B CN 109925795B CN 201711366430 A CN201711366430 A CN 201711366430A CN 109925795 B CN109925795 B CN 109925795B
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Abstract
A method for cleaning a hydrofluorination fluidized bed filter pipe in uranium conversion comprises the following steps of (1) removing dirt on the surface; (2) removing internal dirt; (3) and (5) passivating and drying. The invention has the advantage that a chemical agent is prepared for cleaning the blocked hydrofluorination fluidized bed filter pipe. Can effectively remove the dirt in the filter tube. After the surface dirt of the filter pipe is washed, the dirt inside the filter pipe is further removed by methods of soaking, bubbling and the like by chemical agents. After the dirt inside the filter pipe is removed, the corrosion resistance of the filter pipe can be ensured by using a passivation and drying scheme. The filter pipe cleaned by the cleaning process can meet the process requirements of the hydrofluorination fluidized bed, achieves the aim of recycling, has certain economic benefit and reduces the production cost.
Description
Technical Field
The invention belongs to a tail gas filtering device in uranium conversion, and particularly relates to a cleaning device for a hydrofluorination fluidized bed tail gas filtering device in uranium conversion after blockage.
Background
During use of the hydrofluorination fluidized bed filter tube, unconverted or incompletely converted UO2 particles continue to react with HF in the pores of the filter tube wall to form UF4, resulting in volume expansion of solid particles and thus clogging of the channels. This internal blockage is exacerbated as the operating time increases, at which time the filter tubes need to be replaced and the next filter tube needs to be cleaned for reuse.
The chemical industry mainly aims at cleaning methods of filter pipes, such as chemical cleaning, high-pressure water cleaning and PIG pipe cleaning. The chemical cleaning is to clean the parts to be cleaned by adding chemical agents; the high-pressure water cleaning is performed by the movement of high-pressure pushing water; PIG is a cleaning method that uses the work of a pump to drive PIG (PIG) to push forward in a pipe, and is mainly used for descaling the inner surface of the pipe.
Different agents are required to be prepared for different dirt in chemical cleaning, and no chemical agent for cleaning the blocked hydrofluorination fluidized bed filter pipe in uranium conversion is available at present. And most of the chemical agents are easy to clean and damage the base material, so that the corrosion is caused to different degrees. Chemical cleaning is not combined with the anti-corrosion process.
The high-pressure water cleaning can wash away dirt on the surface of the filter pipe, but the filter pipe of the hydrofluorination fluidized bed is blocked inside the filter pipe, most of the filter pipes are of multi-layer net covering and overlapping structures or metal sintering structures, the filter pipe is possibly damaged due to too high water pressure, and the dirt cannot be removed due to too low water pressure.
PIG cleaning can only remove dirt on the surface of the filter pipe, but cannot remove dirt in the filter pipe, and the cleaning purpose cannot be achieved.
Disclosure of Invention
The invention aims to provide a method for cleaning a hydrofluorination fluidized bed filter pipe in uranium conversion, which can recycle the filter pipe and save the production cost.
The invention is realized in such a way that a method for cleaning a filter pipe of a hydrofluorination fluidized bed in uranium conversion comprises the following steps,
(1) removing dirt on the surface;
(2) removing internal dirt;
(3) and (5) passivating and drying.
And (2) in the step (1), washing water is used for washing the outer surface of the filter pipe to remove dirt on the outer surface of the filter pipe, the pressure of the washing water for washing is not lower than 0.6MPa and not higher than 1MPa, and the water quality standard of the washing water is not lower than the industrial water standard listed in GB/T19923-2005.
6-8% of alkali liquor prepared in the step (2), heating to above 80 ℃, soaking for above 48h, washing with water, wherein the quality standard of NaOH is not lower than that of GB209-93 sodium hydroxide for industrial use, and the quality standard of prepared water is not lower than that of industrial water listed in GB/T19923-2005;
preparing 8-10% NaOH alkali liquor, heating to about 40 ℃, adding hydrogen peroxide to control the concentration to be 15-30%, placing a filter pipe, bubbling compressed air of 0.3Mpa for 24-48h, and cleaning the hydrogen peroxide by using washing water, wherein the quality standard of the hydrogen peroxide is not lower than that of GB/T1616-2014 industrial hydrogen peroxide;
preparing 3-5% of boric acid and hydrochloric acid, heating to about 50 ℃, placing a filter tube, bubbling with 0.3Mpa compressed air for 8-20 hours, and cleaning with washing water, wherein the quality standard of the boric acid is not lower than GB/T538-2006, and the quality standard of the hydrochloric acid is not lower than GB/T320-2006.
In the step (3), 3-5% of citric acid is used, the quality standard of the citric acid is not lower than GB/T8296-2006, the citric acid is heated to 50-60 ℃, a filter tube is placed in the citric acid, passivation is carried out for more than 12 hours, and the citric acid is placed in a heating device at the temperature: drying at about 80 deg.C for about 24 hr.
The invention has the advantage that a chemical agent is prepared for cleaning the blocked hydrofluorination fluidized bed filter pipe. Can effectively remove the dirt in the filter tube. After the surface dirt of the filter pipe is washed, the dirt inside the filter pipe is further removed by methods of soaking, bubbling and the like by chemical agents. After the dirt inside the filter pipe is removed, the corrosion resistance of the filter pipe can be ensured by using a passivation and drying scheme. The filter pipe cleaned by the cleaning process can meet the process requirements of the hydrofluorination fluidized bed, achieves the aim of recycling, has certain economic benefit and reduces the production cost.
Detailed Description
The invention will now be described in detail with reference to specific examples:
a method for cleaning a hydrofluorination fluidized bed filter pipe in uranium conversion comprises the following steps,
(1) removing dirt on the surface;
(2) removing internal dirt;
(3) and (5) passivating and drying.
Washing water is used for washing the outer surface of the filter pipe in the step (1) to remove dirt on the outer surface of the filter pipe, the pressure of the washing water for washing is not lower than 0.6MPa and not higher than 1MPa, and the water quality standard of the washing water is not lower than the industrial water standard listed in GB/T19923-2005.
6-8% of alkali liquor prepared in the step (2), heating to above 80 ℃, soaking for above 48h, washing with water, wherein the quality standard of NaOH is not lower than that of GB209-93 sodium hydroxide for industrial use, and the quality standard of prepared water is not lower than that of industrial water listed in GB/T19923-2005;
preparing 8-10% NaOH alkali liquor, heating to about 40 ℃, adding hydrogen peroxide to control the concentration to be 15-30%, placing a filter pipe, bubbling compressed air of 0.3Mpa for 24-48h, and cleaning the hydrogen peroxide by using washing water, wherein the quality standard of the hydrogen peroxide is not lower than that of GB/T1616-2014 industrial hydrogen peroxide;
preparing 3-5% of boric acid and hydrochloric acid, heating to about 50 ℃, placing a filter tube, bubbling with 0.3Mpa compressed air for 8-20 hours, and cleaning with washing water, wherein the quality standard of the boric acid is not lower than GB/T538-2006, and the quality standard of the hydrochloric acid is not lower than GB/T320-2006.
Heating 3-5% of citric acid with the quality standard of not less than GB/T8296-2006 to 50-60 ℃, putting the filter tube into the device for passivation for more than 12h, putting the device into a heating device, and keeping the temperature: drying at about 80 deg.C for about 24 hr.
The hydrofluorination fluidized bed filter pipe is made of Monel materials, the material and processing cost is high, and as mentioned in the technical background, the existing cleaning method and the existing cleaning process are not suitable for cleaning the hydrofluorination fluidized bed filter pipe and cannot achieve the purpose of recycling after cleaning. The invention provides a cleaning process of a hydrofluorination fluidized bed filter pipe, so that the hydrofluorination fluidized bed filter pipe can be recycled. The aim of saving the production cost is achieved by recycling the filter pipe.
And (3) inverting the filter pipe at the bottom of the lifting device, putting the filter pipe into a cleaning tank, washing the outer surface of the filter pipe with washing water, removing dirt on the outer surface of the filter pipe, wherein the pressure of the washing water for washing is not lower than 0.6MPa and not higher than 1MPa, and the following steps are the same. The water quality standard of the washing water is not lower than the industrial water standard listed in GB/T19923-2005, the same is as follows. After the dirt on the inner surface of the filter pipe is soaked, the filter pipe is repeatedly lifted and lowered downwards to be removed. The scheme needs to be noticed that the pressurized washing water cannot be used for washing the inner surface of the filter pipe so as to prevent the dirt from further entering the inner pores of the filter pipe. After the dirt on the surface of the filter pipe is removed, the waste liquid is discharged through a waste liquid outlet.
The dirt inside the filter tube is mainly as follows: un-or incompletely converted UO2 particles, UF4 particles, and remaining solid impurities.
Particles of UO2, UF4, which were either unconverted or incompletely converted, were readily soluble in nitric acid solution. However, the nitric acid solution is highly corrosive and is likely to cause corrosion of the filter tube and corrosion of the cleaning equipment and the pipe. The use of nitric acid as a cleaning solution will have the consequence that the number of repeated use of the filter tube will be reduced.
Putting the filter tube into a cleaning device, adding alkali liquor (6-8 percent of NaOH), heating to about 80 ℃, soaking for about 48 hours, and cleaning with washing water, wherein the method comprises the following steps: the outer surface is washed by washing water, and the filter pipe is repeatedly immersed and taken out of the washing tank for about 3-4 times, and the number of times is increased or decreased according to the situation, and the same is carried out below. The quality standard of NaOH is not lower than that of industrial sodium hydroxide GB209-93, the same applies hereinafter, and the quality standard of water for preparation is not lower than that of industrial water listed in GB/T19923-2005, the same applies hereinafter; during heating, the alkali liquor can react with UF4 to transfer uranium into the solution in the form of hydroxide, and UF4 remained in the filter tube can be removed through the process.
Preparing 8-10 percent (NaOH) alkali liquor, heating to about 40 ℃, adding hydrogen peroxide (the concentration is controlled to be 15-30 percent), placing a filter tube, bubbling compressed air of 0.3Mpa for 24-48 hours, and cleaning the hydrogen peroxide by using washing water, wherein the quality standard of the hydrogen peroxide is not lower than that of industrial hydrogen peroxide of GB/T1616-2014. Adding a certain amount of hydrogen peroxide into the NaOH solution can cause UO2 to be dissolved, and Na2U2O5 is generated. Unconverted UO2 in the filter tube can be removed by the above procedure.
Preparing boric acid and hydrochloric acid (3-5%), heating to about 50 ℃, placing a filter tube, bubbling compressed air of 0.3Mpa for 8-20 hours, and cleaning with washing water, wherein the quality standard of the boric acid is not lower than GB/T538-2006, and the quality standard of the hydrochloric acid is not lower than GB/T320-2006. The preparation of the boric acid hydrochloride solution can accelerate the dissolution of the incompletely converted UO2 particles due to the formation of the fluoroborate complex. The UO2 particles which are incompletely converted in the filter tube can be removed by the above process.
According to the invention, the cleaning liquid is prepared by using a chemical reagent with low corrosivity, so that the corrosion rate of the filter pipe, cleaning equipment and the pipeline can be reduced, and the method is more economical, stable and reliable.
After the cleaning by using chemical agents, the filter tube is easy to corrode, and the cleaning process is specially added with a passivation step. Heating 3-5% of citric acid with the quality standard of the citric acid not lower than GB/T8296-2006 to 50-60 ℃, putting the filter tube in, and passivating for about 12 hours. An anti-corrosion film can be formed on the surface of the filter pipe through passivation, so that the anti-corrosion performance of the filter pipe is enhanced.
Putting into a heating device, wherein the temperature is as follows: drying at about 80 deg.C for about 24 hr.
The method mainly comprises three steps: removing surface dirt, removing internal dirt, passivating and drying. The using equipment mainly comprises a cleaning tank and a chemical agent configuration tank, and the liquid is transferred by using an electric pump.
The washing water with the pressure not lower than 0.6MPa is used for removing the dirt on the surface, but the water pressure is not higher than 1 MPa.
NaOH preparation liquid, boric acid preparation liquid, hydrogen peroxide preparation liquid, factory steam and compressed air are used for removing internal dirt.
The citric acid preparation liquid is used for passivation, and an electric heating drying box or other heating drying boxes can be adopted for drying.
Claims (1)
1. A method for cleaning a hydrofluorination fluidized bed filter pipe in uranium conversion is characterized by comprising the following steps: which comprises the following steps of,
(1) removing dirt on the surface;
(2) removing internal dirt;
(3) passivating and drying;
washing the outer surface of the filter pipe with washing water to remove dirt on the outer surface of the filter pipe, wherein the pressure of the washing water for washing is not lower than 0.6MPa and not higher than 1MPa, and the water quality standard of the washing water is not lower than the industrial water standard listed in GB/T19923-2005;
6-8% of alkali liquor prepared in the step (2), heating to above 80 ℃, soaking for above 48h, washing with water, wherein the quality standard of NaOH is not lower than that of GB209-93 sodium hydroxide for industrial use, and the quality standard of prepared water is not lower than that of industrial water listed in GB/T19923-2005;
preparing 8-10% NaOH alkali liquor, heating to about 40 ℃, adding hydrogen peroxide to control the concentration to be 15-30%, placing a filter pipe, bubbling compressed air of 0.3Mpa for 24-48h, and cleaning the hydrogen peroxide by using washing water, wherein the quality standard of the hydrogen peroxide is not lower than that of GB/T1616-2014 industrial hydrogen peroxide;
preparing 3-5% of boric acid and hydrochloric acid, heating to about 50 ℃, placing a filter tube, bubbling with 0.3Mpa compressed air for 8-20 hours, and cleaning with washing water, wherein the boric acid quality standard is not lower than GB/T538-2006, and the hydrochloric acid quality standard is not lower than GB/T320-2006;
in the step (3), 3-5% of citric acid is used, the quality standard of the citric acid is not lower than GB/T8269-2006, the citric acid is heated to 50-60 ℃, a filter tube is placed in the device for passivation for more than 12 hours, and the device is placed in a heating device, and the temperature: drying at about 80 deg.C for about 24 hr.
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| CN201711366430.5A CN109925795B (en) | 2017-12-18 | 2017-12-18 | Method for cleaning filter pipe of hydrofluorination fluidized bed in uranium conversion |
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| CN110478983B (en) * | 2019-08-28 | 2021-11-02 | 西部宝德科技股份有限公司 | Regeneration cleaning process of combined filter element |
| CN113893618A (en) * | 2021-10-08 | 2022-01-07 | 岳阳宇翔科技有限公司 | Silicon powder filter core cleaning and regenerating process for polycrystalline silicon production enterprise |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1481270A (en) * | 2000-12-15 | 2004-03-10 | ��ϸ����칫˾ | Method and device for filter backwashing |
| CN103510097A (en) * | 2012-06-26 | 2014-01-15 | 杭州冠洁工业清洗水处理科技有限公司 | Low-corrosion and high-cleanness chemical cleaning method for condenser |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1481270A (en) * | 2000-12-15 | 2004-03-10 | ��ϸ����칫˾ | Method and device for filter backwashing |
| CN103510097A (en) * | 2012-06-26 | 2014-01-15 | 杭州冠洁工业清洗水处理科技有限公司 | Low-corrosion and high-cleanness chemical cleaning method for condenser |
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