Production system of activated alumina balls attached with iron phosphide for sewage treatment test

Abstract

The utility model belongs to the technical field of production systems of phosphating iron balls for sewage treatment, and discloses a production system of activated aluminum oxide balls attached with phosphating iron for a sewage treatment test. The device is mainly and technically characterized by comprising a tubular sintering furnace with a sintering tube, a nitrogen tank and a phosphine gas tank are arranged in front of a gas inlet of the tubular sintering furnace, and the nitrogen tank and the phosphine gas tank are communicated with the gas inlet of the tubular sintering furnace through a control valve and a flow meter; a first phosphine in-situ detector is arranged on an exhaust pipe at the rear end of the tubular sintering furnace, a cooling mechanism is arranged between the tubular sintering furnace and the first phosphine in-situ detector, and a first phosphine absorption tank and a second phosphine absorption tank are arranged behind the first phosphine in-situ detector. And the input amount of the phosphine gas is adjusted according to the data, so that phosphine loss and air pollution caused by excessive phosphine content in the tail gas are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment iron phosphide ball production systems, in particular to a production system for iron phosphide-attached activated alumina balls for sewage treatment tests. Background Art

[0002] With the rapid development of society and technology, water consumption and wastewater discharge are increasing year by year, and water supply is no longer sufficient to meet national needs. The current state of China's water resources is characterized by extensive surface water pollution, shrinking groundwater resources, and increasing water scarcity. While strengthening the effective protection, management, and utilization of existing water resources, it is crucial to increase water reuse and develop new water sources. Traditional homogeneous Fenton catalytic systems can be used to degrade persistent organic matter. However, their practical application is limited by the generation of iron-containing sludge, which can easily cause secondary pollution. Research has shown that polyiron phosphide exhibits high catalytic activity for the decomposition of hydrogen peroxide. Induced by trace amounts of divalent and trivalent iron, it can rapidly generate hydroxyl radicals over a wide range, achieving rapid degradation of organic pollutants. Iron phosphide is attached to activated alumina spheres and used to oxidize carbon-containing organic matter with hydrogen peroxide, with the iron phosphide acting as a catalyst. Currently, a tubular sintering furnace is used to attach iron phosphide to activated alumina balls. Sodium hypophosphite and activated alumina balls soaked in ferric sulfate are placed in the tubular sintering furnace and heated. Phosphine generated by the sodium hypophosphite reacts with ferric sulfate to produce iron phosphide. The above-mentioned device and method have the following drawbacks: First, before heating the sintering furnace, to prevent oxidation of the ferric sulfate, a vacuum must be evacuated to the sintering tube. After heating, a large amount of phosphine is rapidly generated after reaching the reaction temperature. As a result, the pressure in the sintering tube increases rapidly, which can easily cause an explosion if not properly controlled. Due to the highly toxic phosphine, it can cause casualties. Second, the rapidly generated phosphine is under pressure, and the phosphine that does not have time to react is discharged through the exhaust pipe, which not only wastes gas but also burdens the subsequent absorption and treatment of phosphine, which can easily cause air pollution. Third, due to the limitations of reaction conditions and the amount of sodium hypophosphite added, the number of activated alumina balls processed is small, which cannot meet the requirements of small-scale or pilot tests. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a production system for sewage treatment testing which has a simple structure, is safe to use, is easy to control the reaction time, phosphine concentration and pressure, has low air pollution, has good stability of iron phosphide attached to the activated alumina balls, and has good sewage treatment effect.

[0004] To solve the above-mentioned problems, the technical solution adopted by the production system of activated alumina balls with attached iron phosphide for sewage treatment tests of the present invention is as follows: it includes a tubular sintering furnace with a sintering tube, a nitrogen tank and a phosphine gas tank are arranged in front of the air inlet of the tubular sintering furnace, the nitrogen tank and the phosphine gas tank are connected to the air inlet of the tubular sintering furnace through a control valve and a flow meter, a first phosphine in-situ detector is provided on the exhaust pipe at the rear end of the tubular sintering furnace, a cooling mechanism is provided between the tubular sintering furnace and the first phosphine in-situ detector, and a first phosphine absorption tank and a second phosphine absorption tank are provided behind the first phosphine in-situ detector.

[0005] Its additional technical features are:

[0006] The sintering tube has bearings at both ends, and a rotating motor is provided on the side of the sintering tube, and the sintering tube is connected to the rotating motor in a power manner;

[0007] A second phosphine in-situ detector with an alarm function is provided at the exhaust pipe outlet of the second phosphine absorption tank;

[0008] A combustion reactor is provided at the exhaust pipe port of the second phosphine absorption tank, an alcohol lamp is provided near the bottom of the combustion reactor, and a cooling recovery tower is provided on the combustion reactor.

[0009] Compared with the prior art, the production system of activated alumina balls with attached iron phosphide for sewage treatment tests provided by the present invention has the following advantages: First, since it comprises a tubular sintering furnace with a sintering tube, a nitrogen tank and a phosphine tank are arranged in front of the air inlet of the tubular sintering furnace, the nitrogen tank and the phosphine tank are connected to the air inlet of the tubular sintering furnace through a control valve and a flow meter, a first phosphine in-situ detector is arranged on the exhaust pipe at the rear end of the tubular sintering furnace, a cooling mechanism is provided between the tubular sintering furnace and the first phosphine in-situ detector, and a cooling mechanism is provided between the tubular sintering furnace and the first phosphine in-situ detector. A first phosphine absorption tank and a second phosphine absorption tank are set behind the detector. After the activated alumina balls soaked in ferric sulfate and dried are placed in the sintering tube, nitrogen is first introduced into the sintering tube through the nitrogen tank to exhaust the air in the sintering tube. In this way, oxygen in the air is prevented from participating in the reaction during heating. Then the sintering furnace is turned on to heat the sintering tube. When the temperature rises to the set temperature, phosphine gas is introduced into the sintering tube to react with the heated ferric sulfate. The first phosphine in-situ detector set on the exhaust pipe at the rear end of the tubular sintering furnace can detect the phosphine content in the exhaust gas in real time, thereby The input amount of phosphine gas is adjusted according to the data to avoid phosphine loss and air pollution caused by excessive phosphine content in the exhaust gas. The cooling mechanism can effectively reduce the exhaust temperature to prevent the first phosphine in-situ detector from being damaged by excessive temperature. The first phosphine absorption tank and the second phosphine absorption tank are sprayed to further absorb the phosphine in the exhaust gas, thereby reducing air pollution. Secondly, since the sintering tube has bearings at both ends and a rotating motor is provided on the side of the sintering tube, the sintering tube is connected to the rotating motor. During the reaction process, the sintering tube rotates, and the active oxygen in the sintering tube is further absorbed. The alumina balls tumble continuously, making the reaction more thorough. Thirdly, a second phosphine in-situ detector with an alarm function is provided at the exhaust pipe outlet of the second phosphine absorption tank. When the concentration of phosphine in the exhaust gas is high, an alarm is generated, thereby avoiding air pollution. Fourthly, a combustion reactor is provided at the exhaust pipe outlet of the second phosphine absorption tank, an alcohol lamp is provided near the bottom of the combustion reactor, and a cooling recovery tower is provided in the combustion reactor. The phosphine in the exhaust gas can be burned to generate phosphoric acid and water, and the generated phosphoric acid is recovered after cooling, further avoiding air pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic structural diagram of a cross-section of a production system for activated alumina balls with attached iron phosphide for sewage treatment experiments of the present utility model;

[0011] Figure 2 This is a schematic structural diagram of the cross section of a production system for activated alumina balls with attached iron phosphide for wastewater treatment experiments with a combustion reactor. DETAILED DESCRIPTION

[0012] The structure and operating principle of the production system of activated alumina balls with attached iron phosphide for sewage treatment tests of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0013] like Figure 1 and Figure 2 As shown, a schematic structural diagram of a production system of activated alumina balls with attached iron phosphide for sewage treatment experiments according to the present invention is shown. The production system of activated alumina balls with attached iron phosphide for sewage treatment experiments according to the present invention comprises a tubular sintering furnace 2 with a sintering tube 1. A nitrogen tank 4 and a phosphine tank 5 are provided in front of an air inlet 3 of the tubular sintering furnace 2. The nitrogen tank 4 and the phosphine tank 5 are connected to the air inlet 3 of the tubular sintering furnace 2 via a control valve 6 and a flow meter 7. A first phosphine in-situ detector 9 is provided on an exhaust pipe 8 at the rear end of the tubular sintering furnace 2. A cooling mechanism 10 is provided between the tubular sintering furnace 2 and the first phosphine in-situ detector 9. A first phosphine absorption tank 11 and a second phosphine absorption tank 12 are provided behind the first phosphine in-situ detector 9.

[0014] After the activated alumina balls soaked in ferric sulfate and dried are placed in the sintering tube 1, nitrogen is first introduced into the sintering tube through the nitrogen tank 4 to expel air from the sintering tube 1. This prevents oxygen in the air from participating in the reaction during heating. The sintering furnace is then turned on to heat the sintering tube 1. When the temperature reaches the set temperature, phosphine gas is introduced into the sintering tube to react with the heated ferric sulfate. A first phosphine in-situ detector 9, installed on the exhaust pipe at the rear end of the tubular sintering furnace 2, can monitor the phosphine content in the exhaust gas in real time, thereby adjusting the phosphine gas input into the phosphine gas tank 5 based on the data, thereby preventing phosphine loss and air pollution caused by excessive phosphine content in the exhaust gas. A cooling mechanism 10 can effectively reduce the exhaust gas temperature to prevent damage to the first phosphine in-situ detector 9 due to excessive temperature. Spraying in the first and second phosphine absorption tanks 11, 12 further absorbs phosphine in the exhaust gas, reducing air pollution.

[0015] The sintering tube 1 has bearings at both ends, and a rotating motor 13 is provided on the side of the sintering tube 1. The sintering tube 1 is connected to the rotating motor 13. During the reaction, the sintering tube 1 rotates, and the activated alumina balls in the sintering tube roll continuously, making the reaction more thorough.

[0016] A second phosphine in-situ detector 14 with an alarm function is provided at the exhaust pipe outlet of the second phosphine absorption tank 12. When the concentration of phosphine in the exhaust gas is high, an alarm will be generated to avoid air pollution.

[0017] A combustion reactor 15 is provided at the exhaust pipe outlet of the second phosphine absorption tank 12. An alcohol lamp 16 is provided near the bottom of the combustion reactor. A cooling recovery tower 17 is provided on the combustion reactor 15. Phosphine in the exhaust gas can be burned to produce phosphoric acid and water. The produced phosphoric acid is cooled and recovered, further avoiding air pollution.

[0018] The protection scope of the present invention is not limited to the above embodiments. As long as the structure is the same or similar to the production system structure of the activated alumina balls with attached iron phosphide for sewage treatment test of the present invention, it falls within the protection scope of the present invention.

Claims

1. A production system for activated alumina balls with attached iron phosphide for wastewater treatment trials, comprising a tubular sintering furnace with a sintering tube, characterized by: A nitrogen tank and a phosphine tank are provided in front of the air inlet of the tubular sintering furnace. The nitrogen tank and the phosphine tank are connected to the air inlet of the tubular sintering furnace through a control valve and a flow meter. A first phosphine in-situ detector is provided on the exhaust pipe at the rear end of the tubular sintering furnace. A cooling mechanism is provided between the tubular sintering furnace and the first phosphine in-situ detector. A first phosphine absorption tank and a second phosphine absorption tank are provided behind the first phosphine in-situ detector.

2. The production system of activated alumina balls with attached iron phosphide for sewage treatment testing according to claim 1, characterized in that: The two ends of the sintering tube are provided with bearings, a rotating motor is arranged on the side of the sintering tube, and the sintering tube is dynamically connected to the rotating motor.

3. The production system of activated alumina balls with attached iron phosphide for sewage treatment testing according to claim 1, characterized in that: A second phosphine in-situ detector with an alarm function is provided at the exhaust pipe outlet of the second phosphine absorption tank.

4. The production system of activated alumina balls with attached iron phosphide for sewage treatment testing according to claim 1, characterized in that: A combustion reactor is provided at the exhaust pipe port of the second phosphine absorption tank, an alcohol lamp is provided near the bottom of the combustion reactor, and a cooling recovery tower is provided on the combustion reactor.

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