Requirements of slurry pump selection is based on the medium and the reaction tank agitation conditions, overcurrent both corrosion resistance and abrasion resistance pump component materials and reasonable structure, vertical pumps. 1, pump flow choice of component materials under conditions in phosphoric acid (solids content of less than 3%), ultra-low carbon molybdenum titanium and molybdenum titanium corrosion-resistant performance is good, but in the phosphoric acid slurry (solid content 25 % to 35%) under the conditions, wear serious, life shortening. Therefore, in the pump flow passage components materials, with particular attention to the media and working conditions. (1) medium temperature Pump flow components corrosion rate exacerbated with increasing temperature. Such as extraction phosphoric acid the temperature to rise to 85 ° C from 70 ℃, the corrosion rate is doubled. Therefore, the selection should pay attention to the medium temperature. (2) The concentration of phosphoric acid increase in the concentration of phosphoric acid, increased corrosion. Three titanium such as molybdenum stainless steel in the production of phosphoric acid dihydrate can resist, but in hemihydrate phosphate, when used in the reaction tank stirring shaft bushing, using only 85% in a month, there is corrosion, honeycomb Ma point. Therefore, the vertical pump dihydrate phosphoric acid reaction tank over flow but not recommended to use the CD-4Mcu; Z3CNUD26-05; alloy of chromium-30 (F30% CrMo and FCr30); Pump flow components in the production of phosphoric acid hemihydrate recommended chromium 30 (F30% CrMo and FCr30) alloy; J-1 alloy; F5 alloy; SaniCrO28; Hastelloy C. 2, the choice of the pump speed pump speed increases will accelerate the impeller and volute flow parts abrasive corrosion. According to the phosphate phosphorus ammonia abroad device with pump and Yunnan Phosphate Fertilizer Plant introduced in the 1970s, phosphoric acid plant with the speed of the pump, the vast majority of 970 and 1460r/min (more the former), and no up to 2900 r / min rotational speed. Therefore, under the premise that meet the flow, head, try to choose low-speed pump. 3, vertical pumps, horizontal pumps choice 80 years ago, our phosphate Phosphorus ammonia device pumps almost all vertical pumps. Due to the prevailing conditions, horizontal pump shaft seal leakage. Currently, many domestic horizontal pump seal technology has been greatly improved, acid-resistant pump double mechanical seal in Dalian use of the more successful, Zhangjiagang, Jiangsu Jiangnan Chemical plant production vice impeller with flying iron parking sealing pump in domestic all sizes phosphate phosphorus ammonia device running on very successful. The horizontal pumps used in the packing seal, agreed that the carbon fiber filler to use more reliable results. Compared to the vertical pump, horizontal pump also has the following advantages: (1) the horizontal pump prices low, the generally vertical pumps under the same flow, lift conditions 1/2 to 1/3, or even 1/4. (2) The length of the cantilever axis vertical pump support bracket is limited, often to the production control level bring trouble. (3) If the vertical pump can not be installed directly in a trough (as phosphate finished tank), the lower side openings must be performed by a large trough the media led to the small slot on the erection of the vertical pump, which increases investment Sometimes in order to prevent "hit empty" or "full tank", more than one operating workers. 4, the type selection of the pump impeller due to the slurry of phosphoric acid, a slurry and a phosphorus ammonia containing solid particles, are combined into the sodium, potassium, iron, aluminum, magnesium and other impurities from the phosphate rock (especially sodium, potassium) phosphoric acid production process produces sodium fluoride and fluosilicic acid potassium salt dissolved in the phosphoric acid. When the temperature drops, the decrease in solubility and precipitation, it is easy, especially in the impeller of the pump volute form a hard scale layer (these fouling materials, such as calcium sulfate also mixed with other solid phase). Phosphate phosphorus ammonia device generally choose open impeller, especially in the phosphoric acid plant reaction tank and phosphate filtration system, we must use the open impeller; phosphorus ammonia slurry pump should be used in the open impeller 

keywords: Slurry pump selection, pump thick principle,