CN-121990622-A - Online arsenic removal device and detection method

Abstract

The invention discloses an online arsenic removal device and a detection method, wherein the online arsenic removal device comprises a recovery tank and a weighing device, wherein the inside of the recovery tank is provided with filter cloth, the inside of the filter cloth is provided with nano metal adsorbent, the top of the recovery tank is provided with a feed inlet and an exhaust outlet, the bottom of the recovery tank is provided with a discharge outlet, and the side wall of the recovery tank is provided with a nitrogen gas inlet and a material changing port. The on-line arsenic removal device has the advantages of novel structural design, low production cost, flexible and simple operation, high-efficiency separation of arsenide and the like, can improve the efficiency of the device in the field of chemical production, reduce the cost, and has important guiding significance for the operation, recovery development and technical service of the chemical production device.

Inventors

• ZHANG YAN
• BING SHUQIU
• CHEN SIJIA
• RONG LILI
• WANG LEI
• LIU WENYONG
• JIN LILI
• JIN SHUHAN
• LIU LIJUN
• ZHAO JINA

Assignees

• 中国石油天然气股份有限公司

Dates

Publication Date

20260508

Application Date

20241106

Claims (10)

1. 1. The on-line arsenic removal device is characterized by comprising a recovery tank (1) and a weighing device, wherein the filter cloth (5) is arranged in the recovery tank (1), a nano metal adsorbent (4) is arranged in the filter cloth (5), a feed inlet (2) and an exhaust port (6) are arranged at the top of the recovery tank (1), a discharge port (3) is arranged at the bottom of the recovery tank, and a nitrogen gas inlet (7) and a material changing port (8) are arranged on the side wall of the recovery tank.
2. 2. An on-line dearsenification detection method is characterized by comprising the following steps: firstly, weighing a nano metal adsorbent (4) and a filter cloth (5), loading the weighed nano metal adsorbent (4) and the filter cloth (5) into a recovery tank (1), weighing the recovery tank (1) filled with the nano metal adsorbent (4) and the filter cloth (5), purging the recovery tank (1) by using nitrogen, inputting raw material slurry from a feed port (2) of the recovery tank (1), carrying out chemical and physical adsorption on the raw material slurry and the nano metal adsorbent (4) in the filter cloth (5), finishing dearsenification recovery treatment on the raw material slurry, discharging treated waste liquid from a discharge port (3) for further treatment, flushing the nano metal adsorbent (4) and the filter cloth (5) after the waste liquid treatment is finished, determining arsenic content, purging by using nitrogen, and weighing the recovery tank (1).
3. 3. The on-line arsenic removal device according to claim 1 or the on-line arsenic removal detection method according to claim 2, wherein the recovery tank (1) is a cylindrical closed tank body, the volume is 1000 ml-10000 ml, the bearing pressure is 0.1-10 MPa, the pressure in the recovery tank (1) is 0.1-5 MPa, the temperature is 5-90 ℃, the feeding amount is 0.5-200 cm 3 /min, a connecting pipe is further installed at the bottom of the recovery tank (1), and a hose is further installed at the top of the recovery tank.
4. 4. The on-line dearsenification device according to claim 1 or the on-line dearsenification detection method according to claim 2, wherein the bottom of the recovery tank (1) is provided with three supporting legs, and a fixing frame is installed between the supporting legs.
5. 5. The on-line dearsenification device according to claim 1 or the on-line dearsenification detection method according to claim 2, wherein the exhaust port (6) is connected with the vent line through a stainless steel pipeline with a flange, and a safety valve is arranged in front of the exhaust port (6) for maintaining the pressure in the recovery tank (1) constant.
6. 6. The on-line dearsenification device according to claim 1 or the on-line dearsenification detection method according to claim 2, wherein the filter cloth (5) is inlaid in a groove of the filter screen frame.
7. 7. The on-line dearsenifying apparatus according to claim 1 or the on-line dearsenifying method according to claim 2, wherein the filter cloth (5) is provided with a single layer or multiple layers depending on the throughput, and the pore size of the filter cloth (5) is 100-300 mesh.
8. 8. The on-line dearsenification apparatus according to claim 1 or the on-line dearsenification detection method according to claim 2, wherein said nano-metal adsorbent (4) comprises a reaction product of a metal compound, a nano-adsorption carrier and polydopamine; wherein the nano adsorption carrier is mainly selected from at least one of activated carbon, graphene oxide, carbon nano tube, clay mineral, zeolite, montmorillonite, modified material alumina and molecular sieve.
9. 9. The method according to claim 2, characterized in that at least one of hexane, isopentane and isobutane is used for flushing the nano-metal adsorbent (4) and the filter cloth (5).
10. 10. The method for on-line dearsenification detection according to claim 2, wherein the method for on-line dearsenification detection judges the recovery effect and the balance of the nano metal adsorbent (4) through the weight change before and after recovery, and the weight is increased before and after weighing, the nano metal adsorbent (4) chemically reacts with arsenide in the raw material slurry, and if the weight is not changed, the nano metal adsorbent (4) is considered to be completely consumed, and the nano metal adsorbent (4) needs to be replaced and supplemented in time; The raw material slurry is a recovered organic solvent, which contains one or more of aliphatic hydrocarbon solvents, alcohol solvents, fatty acid ester solvents, ketone solvents, halogenated alkyl solvents and benzene solvents; the aliphatic hydrocarbon solvent is one or more of n-pentane, isopentane, methylcyclopentane, 2-methylpentane, 3-methylpentane, 2, 3-dimethylbutane, 2-dimethylbutane, n-hexane, cyclohexane, n-heptane and n-octane; the alcohol solvent is selected from one or more of methanol, ethanol, isopropanol and n-butanol; the fatty acid ester solvent is selected from one or more of methyl acetate, ethyl acetate, propyl acetate and butyl acetate; The ketone solvent can be selected from one or more of acetone, butanone, methyl ethyl ketone, cyclohexanone, isopropyl ketone, methyl butanone, methyl isobutyl ketone, methyl ethyl ketone, methyl pentanone and cyclohexanone; the halogenated alkyl solvent is selected from one or more of dichloromethane, normal hexane and 1, 2-dichloroethane; the benzene solvent is selected from one or more of benzene, toluene and xylene.

Description

Online arsenic removal device and detection method Technical Field The invention belongs to the application field of chemical wastewater treatment and reclamation, and particularly relates to an industrial on-line arsenic removal device and a detection method, which are suitable for the field of waste gas and liquid recovery in petroleum processing and refining industry. Background Arsenic is a carcinogen with toxic effects on human body and other organisms, is mostly associated with nonferrous metal ores in nature, and enters nonferrous smelting plants along with concentrate. Arsenic-containing materials can generate toxic substances such as arsenic oxide, arsenic hydride and the like with toxicity far greater than that of arsenic in the treatment process of nonferrous smelting plants, in particular in the leaching, purifying and electrolyzing processes of wet smelting technology. Among the various compounds of arsenic, arsenic hydride is the most toxic, and is a severe hemolytic species, and poisoning can lead to accumulation of hydrogen peroxide and destruction of cell membranes. Therefore, the management of arsenic-containing gas and liquid must be carefully controlled, and the contact with water and humid air is strictly prevented. At present, no suitable method exists for treating arsenide in China, and environmental problems caused by the arsenide always plague metallurgical workers, and individual factories only ventilate through workshops and simply absorb and purify places. Therefore, it is very necessary to establish an industrial on-line arsenic removal device and method so as to monitor the arsenic content in products and raw materials in time, adjust the process method and process parameters in time, reduce the arsenic concentration in the reaction liquid, reduce the inactivation amount of the catalyst, prolong the service life of the catalyst and improve the economic benefit. Because arsenic has stronger reducibility, chemical absorption method is generally adopted for early removal of arsenic hydride, and the arsenic is converted into trivalent arsenic or pentavalent arsenic by oxidation reaction of strong oxidizing aqueous solution and arsenic. Taking potassium permanganate as an example, when the potassium permanganate is used as an absorption liquid for purifying arsenic element, potassium sulfate, potassium arsenate, manganese dioxide and the like are generated, secondary pollution is caused, and the problems limit the application of the chemical absorption method. The method has the advantages that the method can be used for treating the arsenic by connecting other equipment in series, the effect is greatly improved, at present, the research and the application of purifying the arsenic oxide and the arsenic hydride by utilizing the modified adsorbent are most widely carried out, and the single metal, the metal oxide, the composite metal oxide or the sulfide are loaded on the activated carbon, the aluminum oxide, the carbon nano tube and the molecular sieve for modification, so that the arsenic oxide and the arsenic hydride can be removed by adsorption, catalytic oxidation and other modes. The modified adsorbent is widely applied due to the advantages of simple preparation, selective adsorption, no secondary pollution and the like. Particularly, the activated carbon is used as a carrier of the adsorbent, has the advantages of low cost, wide sources, acid and alkali resistance, good adsorption performance, large specific surface area, no toxicity and the like, is widely applied to various adsorption fields, and is also suitable for the research field of removing arsenic elements. The physical activation method, the chemical physical method, the catalytic activation method and the template method are all commonly used preparation methods of modified activated carbon adsorbents, and now, single metal compounds or double metal oxides such as copper-based, lead-based, zinc-based and palladium-based are mainly used for removing arsenic. The source of arsenide is wide, and the waste gas liquid generated in the industrial production process is a main source of arsine, wherein the waste gas liquid comprises phosphorus chemical industry, coal chemical industry, nonferrous metal smelting and petroleum processing refining industry and the like. The waste gas liquid recovery treatment process is an indispensable step in laboratory and industrial polymerization experiments, and is mainly used for reducing the content of toxic substances in raw materials and avoiding the toxic substances from polluting the atmosphere, rivers, lakes and soil in a diffusion mode. Therefore, the arsenic content of the waste gas liquid is reduced, so that the production index requirement is met, and adverse effects on the polymerization reaction can be avoided. The research reports about the removal of organic arsenic at home and abroad are less, the research reports mainly focus on the adsorption of multi-wall nanotubes a