Conventional pumps used in the production of wet-process phosphoric acid have various drawbacks and are now being introduced to manufacturing enterprises by their increasingly sophisticated hose pumps. 1. Hose pump structure and working principle Hose pump is the pump housing, rotor body, reducer, machine base and hose 5 most of the components, shown in Figure 1. Hose pump work, the rotor body rotation, the rotor body of a pair of pressure roller along a special hose rotation, the pressure roller and the pressure generated by the casing will be flattened hose, tube flexibility in itself and the side guide roller , The liquid is sucked into the vacuum by recovering the original shape, and the liquid is discharged from the tube by the mechanical squeeze of the press roll, so as to reciprocate. The pump structure is simple, easy to make. Pump durability depends mainly on the flexibility and corrosion resistance of the pipe, the flow and the motor speed and the size of the tube diameter, so the key is to choose the tube and speed control mechanism, as long as the tube has a long enough life, speed stability, long-term There is no problem with maintaining a constant delivery. 2. Hose pump main features (1) is a positive displacement pump, its mechanical seal, self-absorption ability, self-cleaning and other characteristics. (2) No pump valve, stuffing box, will not produce the leakage of sealing pump and air resistance phenomenon. (3) simple structure, strong adaptability, liquid, gas, slurry and viscous suspended material can be transported, especially the smooth hose cavity can pump impurities liquid, a variety of fiber objects and containing the particle size of Hose diameter 1/4 below the solid slurry, and does not produce any blockage. (4) without running the pump before running, dry run, there will be no spindle seals and other failures, the pump suction liquid only contact with the hose, it can transport rubber can withstand corrosive and abrasive media, you can replace the general Stainless steel pump. (5) can be positive and negative rotation, without setting the import and export, less power consumption, high hydraulic and volumetric efficiency. (6) has a good measurement capability, can be used as a metering pump, by selecting the size of the tube and adjust the speed change flow, a wide range of flow (3 ~ 9m3 / h), measurement accuracy, high repeat accuracy (7) A wide range of pipe materials (vinyl plastic, nylon, rubber and silicone rubber, etc.), suitable for conveying a variety of corrosive, toxic, sterile, radioactive and other media. Tube diameter 0.5 ~ 75mm, working pressure up to. .98MPa, the working temperature is -62 ~ +260 '℃ The contact life of the pipe is generally 200 ~ 700h. When you can not continue to use, you can change the extrusion of the pipe or replace the new tube. (8) 1 pump head can hold 1 to 20 tubes or 1 pump Install multiple sets of pump head work, while conveying one or more media. 1 pump multi-purpose, 1 pump can replace several pumps (suction, row can be homework), small working volume, high efficiency mouth. 3. Hose pump pipe selection The key component of a hose pump is the tube, which is the only flow-through part of the pump. Only the hose to meet the technical requirements, the pump can work properly, it should be based on the purpose of use and the nature of the media to choose. Common pipe grades are: Tygon (R3603, ordinary type): inexpensive, corrosion-resistant, generally used in laboratories, can be used for good vacuum pump system; Tygon (special type): transport of hydrocarbon medium, the most suitable In gasoline, fuel oil and lubricants; Viton: can deliver special corrosive chemicals and reagents, but expensive, short service life; Silicone: meet the UADA (rubber formula test solvent) standards and the FDA (rubber formula test solvent) Wide operating temperature range, the temperature generated by the hardening of small, affordable, long life, when the pump head speed of 200r / min, 450h after work, there is still some flexibility. The choice of pipe, the main consideration of the following factors: corrosion resistance, operating conditions (pressure, temperature, flow, etc.), with or without toxicity and price. These conditions affect each other, so we should make a comprehensive trade-off before we can make economic choices. Due to the long service life of Silicone, the working time of the continuous operation of the pump head is up to 1200h when the rotating speed of the pump head is 50r / min, good elastic force, high chemical stability, non-toxic, inexpensive and adequate supply, widely used. 4. Hose pump application and effect Hefei Quartet Phosphate Fertilizer Co., Ltd. (formerly Anhui Jianghuai phosphate rock) originally used to transport pulp is 4 sets of diaphragm pumps, the transmission distance of 30m, fall Qiao m (2 parallel use, the other two relay delivery). Now after the process of transformation, use a hose diameter of 65mm hose instead of the original diaphragm pump, before and after the transformation process shown in Figure 2, Figure 3. Hose pump a one-time investment, long service and maintenance cycle, less maintenance costs, operating costs decline. 5. Conclusion In the early 1980s, with the rapid development of the rubber-plastic industry, new materials and new varieties of pipes with good elasticity and corrosion resistance were emerging constantly. A large number of hose pumps emerged and their varieties and products were close to the 1 / 3. Hose pump has been applied to the laboratory quantitative fluid delivery, chemical spray granulation plant, thick slurry, concentrated pulp, saturated brine delivery, sewage treatment plant sludge transport and other fields, especially in recent years in the complex phosphorus Application of fertilizer production has been made more obvious economic benefits, it is worth promoting.