The multi-stage fluidized bed developed by the nuclear industry in the early 1970s began to recover uranium from uranium mine wastewater. This type of tower is simpler than the multi-compartment fluidized bed of the US Bureau of Mines. The baffle ring was removed and the cloth hole on the tray was changed to a 7 mm diameter hole to make the liquid of each stage more uniform. The liquid of the bottom tower section is made of three parallel pipes, and the flow rate of each branch pipe is controlled by three flow meters when the liquid is fed. The top of the tower uses resin metering, dehydration, and washing funnels to ensure stable operation. The uranium concentration in the adsorbent tail liquid can reach the national standard of surface water of -0.05mg/L. Compared with the fixed bed ion exchange system used in the past, the resin input is reduced by 70%, and the uranium drainage concentration can meet the national emission standards. Therefore, this tower was quickly promoted and used in domestic uranium mines. Equipment and process flow are shown in Figure 1. The schematic diagram of the adsorption tower monomer is shown in Figure 2.

Figure 1 Multi-stage fluidized bed system developed by Nuclear Industry Six

1-acid hydrazine; 2-rich liquid storage tank; 3-sulfuric acid metering tank; 4-meter dehydration funnel;

5-leaching tank; 6-resistant pump; 7-sifting tank; 8-adsorption tower;

9-rinsing tower; 10,11-rotor flowmeter.

Figure 2 Schematic diagram of the adsorption tower monomer

The multi-stage fluidized bed developed by the Nuclear Industry Six has not only been successfully applied to the recovery of uranium from uranium mine wastewater, but has also been used in the treatment of uranium heap leaching liquid since the 1980s. The concentration of uranium in the leachate ranges from 424 to 5060 mg/L, iron is 499 to 1590 mg/L, and the saturated resin uranium capacity is 40 to 75 g of uranium/L resin. The uranium concentration of the adsorbed tail liquid is ≤5mg/L, and it is returned for use as a leachate. The uranium concentration of the leaching rich liquid is >5g/L. When the tower is used to treat low-concentration uranium mine wastewater, the maximum flow rate can reach 40m/h, which is used for the treatment of heap leaching liquid. Because the uranium concentration is very high, the flow rate is reduced to 5~10m/h, and it can still operate stably. this can be seen, the metal flow rate and the concentration of the scope of this column is wide.

M Meltblown Nonwoven Production Line

SMS: Spunbond non-woven fabric + meltblown non-woven fabric + spunbonded non-woven fabric = three-layer fiber web hot-rolled, which is a composite non-woven fabric. The non-woven equipment uses a double-bearing enclosed bushing with high precision , The fiber can be fully carded, and the cotton web will be evenly added. Non-woven equipment is mainly a kind of mechanical equipment that uses non-woven fabrics, melt-blown fabrics, etc. as raw materials, and uses the pressure-cutting function of ultrasonic waves to produce filter cotton of various shapes and sizes. It produces spunbonded and melt-blown composite products. , Has the advantages of high strength, good filtering performance, no adhesive, non-toxic and so on. It is non-toxic, tasteless, and highly effective in separating bacteria. Through the special treatment of the equipment, it can achieve antistatic, anti-alcohol, anti-plasma, water repellent and water production properties. Mainly used in medical and health labor protection products such as surgical gowns, surgical caps, protective clothing, hand washing clothes, handbags, etc. The thin SMS non-woven fabric (10-25gsm), due to its waterproof and breathable properties, is especially suitable for the sanitary market, such as sanitary napkins, sanitary pads, baby diapers, adult incontinence diapers, side leakage prevention and backing, etc. Medium-thickness SMS non-woven fabric (25-50gsm), suitable for use in medical treatment, making surgical gowns, surgical wraps, surgical drapes, sterilization bandages, wound placards, plasters, etc. It is also suitable for industrial use. Make work clothes, protective clothing, etc. SMS products are more suitable for high-quality medical protective materials due to their good isolation performance, especially those SMS products that have undergone three anti-static and anti-static treatments, and have been widely used worldwide. Thick SMS products (>55gsm) are widely used as high-efficiency filter materials for various gases and liquids. At the same time, they are also excellent high-efficiency oil-absorbing materials. They are used in industrial waste water degreasing, marine oil cleaning and industrial wipes.