阅读说明：本技术 一种铀矿水冶防泄漏环保型密实移动床吸附塔及使用方法 (Uranium ore hydrometallurgy leakage-proof environment-friendly type dense moving bed adsorption tower and use method ) 是由 张兆光 王振北 王库 王一达 周成山 于 2018-06-25 设计创作，主要内容包括：本发明公开了一种铀矿水冶防泄漏环保型密实移动床吸附塔,其特征在于,包括塔体,溢流管,溢流液塔盘,塔盘密封装置,进料口,出料口,树脂出口,裙座,树脂贮罐,所述密实移动床吸附塔还包括所述塔盘密封装置,所述塔盘密封装置的下缘密封安装在所述溢流液塔盘的上缘,所述塔盘密封装置的上端与所述树脂贮槽外壁密封连接,与溢流液塔盘形成溢流液的密闭空间。本发明还公开了一种铀矿水冶防泄漏环保型密实移动床吸附塔的使用方法。本发明具有密封效果好、加工制作简单、运行成本低的优点。(The invention discloses a uranium ore hydrometallurgy leakage-proof environment-friendly compact moving bed adsorption tower which is characterized by comprising a tower body, an overflow pipe, an overflow liquid tower tray, a tower tray sealing device, a feeding hole, a discharging hole, a resin outlet, a skirt, a resin storage tank, and the compact moving bed adsorption tower also comprises the tower tray sealing device, wherein the lower edge of the tower tray sealing device is hermetically arranged on the upper edge of the overflow liquid tower tray, the upper end of the tower tray sealing device is hermetically connected with the outer wall of a resin storage tank, and an overflow liquid closed space is formed by the tower tray and the overflow liquid tower tray. The invention also discloses a use method of the uranium ore hydrometallurgy leakage-proof environment-friendly type dense moving bed adsorption tower. The invention has the advantages of good sealing effect, simple processing and manufacturing and low operation cost.)

1. The uranium ore hydrometallurgy leakage-proof environment-friendly compact moving bed adsorption tower is characterized by comprising a tower body, an overflow pipe, an overflow liquid tray, a tray sealing device, a feed inlet, a discharge port, a resin outlet, a skirt and a resin storage tank, wherein the tower body is arranged on the upper part of the skirt, the resin outlet is arranged at the bottom of the tower body, the feed inlet is arranged at the lower part of the tower body and is higher than the position of the resin outlet, the overflow liquid tray is arranged on the upper part of a straight section of the tower body, the overflow pipe is arranged at the top of the tower body and is positioned inside the overflow liquid tray, the discharge port is arranged at the bottom of the overflow liquid tray and extends towards the bottom of the tower body, and the resin storage tank is coaxially arranged at the top of;

the dense moving bed adsorption tower also comprises the tray sealing device, the lower edge of the tray sealing device is hermetically arranged on the upper edge of the overflow liquid tray, and the upper end of the tray sealing device is hermetically connected with the outer wall of the resin storage tank to form an overflow liquid closed space with the overflow liquid tray.

2. The uranium ore hydrometallurgy leakage-proof environment-friendly type dense moving bed adsorption tower according to claim 1, wherein the tray sealing device comprises a steel skeleton, a cover plate, a manhole and a sealing fitting; the steel skeleton is arranged at the bottom, the top and the periphery of the tower tray sealing device as a main body structure and a bearing structure, the cover plate is fixed on the steel skeleton through the sealing fittings, and the manhole is arranged on the cover plate.

3. The uranium ore hydrometallurgy leakage-proof environment-friendly dense moving bed adsorption tower of claim 2, characterized in that, the steel skeleton includes square steel foundation ring, square steel stud, flat steel ring, square steel top ring, square steel back timber and square steel bracing, square steel foundation ring welding with the inboard of overflow liquid tray, square steel stud vertical welding is in on the square steel foundation ring, square steel top ring welding is in the top of square steel stud, square steel back timber one end fixed connection be in resin storage tank outside other end fixed connection be in on the square steel top ring, square steel bracing one end fixed connection be in on the square steel stud other end fixed connection be in on the square steel back timber, as the reinforcing ring the flat steel ring welding is in the middle part of square steel stud.

4. The uranium ore hydrometallurgy leakage-proof environment-friendly dense moving bed adsorption tower according to claim 3, characterized in that the cover plate further comprises a top cover plate and a side cover plate, the side cover plate encloses a vertical surface cylinder body forming the tray sealing device and is fixedly connected to the outer side of the square steel studs, the top cover plate is in the shape of two semicircular rings and is fixedly connected to the upper side of the square steel top beam and the top of the square steel studs.

5. The uranium ore hydrometallurgy leakage-proof environment-friendly dense moving bed adsorption tower according to claim 4, wherein the top cover plate is made of S31603 material and welded to the outer side of the resin storage tank, the upper side of the square steel top beam and the top of the square steel studs.

6. The uranium ore hydrometallurgy leakage-proof environment-friendly type dense moving bed adsorption tower according to claim 4, wherein the side cover plate is made of polycarbonate sheet material.

7. The uranium ore hydrometallurgy leakage-proof environment-friendly dense moving bed adsorption tower according to claim 2, wherein the sealing fittings comprise rivets, bolts, nuts, gaskets, rubber gaskets and sealants; the rivet is used for riveting the polycarbonate plate and the steel structure; bolts, nuts, gaskets and rubber gaskets are used for the manhole seal; the sealant is used for sealing the gap between the contact edges of the polycarbonate plate and the steel skeleton.

8. The uranium ore hydrometallurgy leakage-proof environment-friendly dense moving bed adsorption tower according to claim 4, wherein the top cover plate is further provided with at least one vent, and the vent is further provided with an exhaust device.

9. The uranium mining hydrometallurgy leakage-proof environment-friendly dense moving bed adsorption tower according to claim 4, characterized in that the manhole is arranged on the side cover plate, the manhole comprises a manhole flange and a manhole cover, the manhole flange is made of S31603 materials, the manhole cover is made of polycarbonate plates and is in sealing connection with the manhole flange through bolts and compression rubber pads, the manhole further comprises a rotating mechanism, the rotating mechanism comprises an ear plate and a pin shaft, one end of the pin shaft is connected with the manhole flange, and the other end of the pin shaft is connected with the manhole cover.

10. A use method of a uranium mining hydrometallurgy leakage-proof environment-friendly compact moving bed adsorption tower according to claim 8, firstly opening an exhaust device on a vent, starting to exhaust air, leading leachate into the feed inlet, leading the leachate through a resin bed layer in the tower body, discharging adsorption tail liquid from an overflow pipe on the upper part of the tower body, entering an overflow liquid tray, and passing through a discharge port discharge system, when the resin on the lower part of the tower body is saturated in adsorption, discharging the resin saturated in adsorption from a resin outlet, supplementing the resin from an upper resin storage tank to the upper part of the tower body, stopping leading the leachate into the feed inlet after the adsorption process is completed, and closing the exhaust device on the vent after 0.5-1 hour.

Technical Field

The invention belongs to the technical field of uranium ore hydrometallurgy, and particularly relates to a leak-proof environment-friendly compact moving bed adsorption tower for uranium ore hydrometallurgy and a using method.

Background

Along with the increasing speed of human production and living, particularly the driving of the economic prosperity and growth in recent ten years in developing countries, the demand for energy also increases year by year, the limited storage of fossil energy has become an important factor restricting the development of human society, and in addition, the emission of a large amount of greenhouse gases and the environmental pollution of the traditional thermal power generation lead the human to continuously realize the conversion to the utilization of renewable energy. The nuclear energy is used as clean energy, and the specific weight of the energy becomes an important component in recent years, and the annual speed increase is 2.3%. The mining and utilization of uranium ore, which is a nuclear source material, have become important in recent years.

Ion exchange is a technique for extracting and separating elements from a solution. In domestic uranium hydrometallurgy plants, the method for extracting uranium from uranium ore leaching liquid by adopting an ion exchange technology is one of the most common and effective methods at present, and has the advantages of strong separation selectivity, no consumption of expensive reagents, simple and compact equipment form, convenient operation, easy realization of automatic control and the like. At present, the treatment capacity of leachate of in-situ leaching uranium mines in China is large, the uranium concentration is low, and the process of extracting uranium from the leachate by using an ion exchange method is basically adopted. Ion exchange equipment is widely and characteristically diverse, and there are types of fixed beds, fluidized beds, dense moving beds, and the like, according to the bed state. The dense moving bed adsorption tower is a key device of ion exchange technology, and the common dense moving bed adsorption tower mainly comprises a tower body, a liquid distribution device, a liquid discharge device (overflow liquid tray), a top resin storage tank and the like. When the dense moving bed adsorption tower feeds liquid, leachate rapidly flows through a resin bed layer from bottom to top (the carrying-out speed is allowed to be reached), and generated adsorption tail liquid flows out through an overflow liquid tray at the top of the tower.

According to the relevant requirements on radiation protection of uranium dressing and smelting plants in the uranium mining and smelting radiation protection regulation (EJ993-2008), the radioactive radon concentration in the air of the workplace of a hydrometallurgy plant is not more than 1.1kBq/m³". Currently production considerations of replacementThe overflow liquid tray (hereinafter referred to as overflow liquid tray) on the top of the compact moving bed adsorption tower is of an open structure, so that the situation that adsorption tail liquid diffuses in the overflow process of the overflow liquid tray easily occurs under the condition of no sealing, the radioactive radon concentration in the operation environment exceeds several times or even more than dozens of times of the requirement of an environmental protection limit value can be detected in the detection process of the operation environment, the hidden danger of harm to the occupational health of workers in the operation environment can be detected due to the situation, and the requirements of occupational health and safety on the working environment are not met.

Although a ventilation device is considered in the area of the overflow liquid tray in production, the adsorption tail liquid flow of the uranium water smelter is large, the release amount of radon gas is large, the release and diffusion time is long, if the ventilation amount is increased infinitely, the number of fans is large, the investment is high, and the temperature in a factory is reduced due to overlarge ventilation amount.

At present, some uranium hydrometallurgy plants adopt materials such as plastic films and the like to seal overflow liquid trays, but the sealing effect is poor, the radioactive radon concentration in the operation environment still exceeds the requirement of environmental protection limit value by more than several times, and the normal operation of personnel is greatly influenced.

The above prior art has the following disadvantages;

1. the radioactive radon concentration around the overflow liquid tray on the upper part of the compact moving bed exceeds the standard, so that the hidden danger of occupational health hazard to workers exists;

2. the environmental ventilation method is adopted to treat radioactive radon pollution, the investment of fixed assets is high, the operation time of ventilation equipment is long, the operation cost is high, and the environmental temperature in a factory building cannot be ensured;

3. the existing overflow liquid tower tray sealing mode has low reliability and poor sealing effect, and can not meet the requirements of occupational health and safety on working environment.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a leak-proof environment-friendly type dense moving bed adsorption tower for uranium ore hydrometallurgy.

The invention is realized by the following technical scheme:

the uranium ore hydrometallurgy leakage-proof environment-friendly compact moving bed adsorption tower is characterized by comprising a tower body, an overflow pipe, an overflow liquid tray, a tray sealing device, a feed inlet, a discharge port, a resin outlet, a skirt and a resin storage tank, wherein the tower body is arranged on the upper part of the skirt, the resin outlet is arranged at the bottom of the tower body, the feed inlet is arranged at the lower part of the tower body and is higher than the position of the resin outlet, the overflow liquid tray is arranged on the upper part of a straight section of the tower body, the overflow pipe is arranged at the top of the tower body and is positioned inside the overflow liquid tray, the discharge port is arranged at the bottom of the overflow liquid tray and extends towards the bottom of the tower body, and the resin storage tank is coaxially arranged at the top of;

the dense moving bed adsorption tower also comprises the tray sealing device, the lower edge of the tray sealing device is hermetically arranged on the upper edge of the overflow liquid tray, and the upper end of the tray sealing device is hermetically connected with the outer wall of the resin storage tank to form an overflow liquid closed space with the overflow liquid tray.

In the technical scheme, the tray sealing device comprises a steel skeleton, a cover plate, a manhole and a sealing fitting; the steel skeleton is arranged at the bottom, the top and the periphery of the tower tray sealing device as a main body structure and a bearing structure, the cover plate is fixed on the steel skeleton through the sealing fittings, and the manhole is arranged on the cover plate.

In the technical scheme, the steel skeleton includes square steel foundation ring, square steel stud, band steel circle, square steel top ring, square steel back timber and square steel bracing, square steel foundation ring welding with the inboard of overflow liquid tower tray, square steel stud welds perpendicularly on the square steel foundation ring, square steel top ring welding is in the top of square steel stud, square steel back timber one end fixed connection be in resin storage tank outside other end fixed connection be in on the square steel top ring, square steel bracing one end fixed connection be in on the square steel stud other end fixed connection be in on the square steel back timber, as the beaded finish circle the band steel circle welding is in the middle part of square steel stud.

In the above technical solution, the cover plate further includes a top cover plate and a side cover plate, the side cover plate encloses a vertical cylinder forming the tray sealing device and is fixedly connected to the outside of the square steel studs, the top cover plate is in the shape of two semicircular rings and is fixedly connected to the upper side of the square steel top beam and the top of the square steel studs.

In the technical scheme, the top cover plate is made of S31603 materials and is welded on the outer side of the resin storage tank, the upper side of the square steel top beam and the top of the square steel stud.

In the above technical solution, the side cover plate is made of a polycarbonate plate.

In the technical scheme, the sealing fittings comprise rivets, bolts, nuts, gaskets, rubber gaskets and sealing glue; the rivet is used for riveting the polycarbonate plate and the steel structure; bolts, nuts, gaskets and rubber gaskets are used for the manhole seal; the sealant is used for sealing the gap between the contact edges of the polycarbonate plate and the steel skeleton.

In the above technical scheme, the top cover plate is further provided with more than one vent, and the vent is further provided with an exhaust device.

In the technical scheme, the manhole is arranged on the side cover plate and comprises a manhole flange and a manhole cover, the manhole flange is made of S31603 materials, the manhole cover is made of a polycarbonate plate, and the manhole cover is connected to the manhole flange in a sealing mode through bolts and compression rubber pads.

In the above technical scheme, the manhole further comprises a rotating mechanism, the rotating mechanism is composed of an ear plate and a pin shaft, one end of the pin shaft is connected with the manhole flange, and the other end of the pin shaft is connected with the manhole cover.

The utility model provides a uranium ore hydrometallurgy prevents closely knit moving bed adsorption tower of environmental protection type application method, at first opens the exhaust apparatus on the vent, begins to exhaust, lets in the leachate the feed inlet, the leachate passes through the resin bed in the tower body, and the overflow pipe on absorption tail liquid follow tower body upper portion discharges, gets into overflow liquid tower tray to through discharge gate discharge system, when tower body lower part resin adsorption is saturated, follow the resin that adsorbs saturation the resin export is discharged, and supplementary resin from upper portion resin basin mends extremely the upper portion of tower body stops after accomplishing the adsorption process and lets in the leachate the exhaust apparatus on the feed inlet, 0.5 ~ 1 hour after close the vent.

The invention has the advantages and beneficial effects that:

1. the sealing effect is good: the dense moving bed adsorption tower with the overflow liquid tray provided with the sealing device can effectively inhibit the diffusion of radioactive radon elements, solve the problem that the radon elements are released outwards in the overflow process of the adsorption tail liquid in the overflow liquid tray, and prevent the radioactive radon concentration in an operation area from exceeding the standard.

2. The processing and manufacturing are simple: the dense moving bed adsorption tower is simple to manufacture and easy to install.

3. The operation cost is low: the work environment air exhaust volume is greatly reduced, the number of fans for environment ventilation can be effectively reduced, and the ventilation and plant heat preservation cost is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a uranium ore hydrometallurgy leakage-proof environment-friendly type dense moving bed adsorption tower.

Fig. 2 is a front view of a portion of a tray seal of example 1 of the present invention.

Fig. 3 is a top view of a portion of a tray seal of example 1 of the present invention.

Wherein:

1: a resin storage tank; 2: a tray sealing device; 3: a flooded tray; 4: an overflow pipe; 5: a tower body; 6: a discharge port; 7: a feed inlet; 8: a resin outlet; 9: a skirt; 10: a square steel bottom ring; 11: square steel studs; 12: a flat steel ring; 13: a square steel top ring; 14: a top cover plate; 15: a square steel top beam; 16: a square steel diagonal bracing; 17: a side cover plate; 18: a manhole cover; 19: a vent; 20: a manhole flange; 21: a rotation mechanism.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.