Wet-Process Phosphoric Acid Production Line (50,000-300,000 t/y)
Complete phosphoric acid purification system for producing industrial-grade and food-grade phosphoric acid
Wet-process phosphoric acid production technologies can be classified as follows: Sulfuric acid process, nitric acid process, hydrochloric acid process. Among these, the sulfuric acid process is the most widely applied industrial route.
The sulfuric acid process can be further divided into: Anhydrite process, hemihydrate process, dihydrate process, dihydrate-hemihydrate process, hemihydrate-dihydrate process. Currently, the dihydrate process is the dominant technology, accounting for over 80% of global wet-process phosphoric acid production.
Product quality: Complies with GB/T 2091-2008 Industrial Phosphoric Acid
Process Advantages- Proven and mature technology
- Strong adaptability, particularly suitable for medium- and low-grade phosphate rock
- Simple equipment configuration
- Stable and reliable operation
- Enables wet grinding of phospharite
Phosphate rock slurry and 98 wt% sulfuric acid are fed into an agitated reaction tank at a controlled ratio. Key operating parameters, including SO₄²⁻ concentration and liquid-to-solid ratio (2.5-3.0:1), are precisely controlled.
The reaction slurry overflows from the reactor and is pumped by a slurry pump to a rotary table filter, where solid-liquid separation is completed under vacuum conditions.
The filtrate (dilute phosphoric acid) is pumped by a pump to the raw phosphoric acid tank area. The dilute phosphoric acid is then concentrated by forced-circulation vacuum evaporation. From the outlet of the phosphoric acid circulation pump, the acid together with circulating acid preheated to approximately 80℃, then enters a flash chamber, where most of the water is evaporated.
The phosphoric acid is concentrated to approximately 50 wt% P₂O₅ and transferred to the concentrated acid storage area, where it is stored in concentrated acid settling tanks.
- Reaction tank, slurry pump, underground reaction sump, submerged sump pump, first-stage tail-gas washing pump, first-stage tail-gas washing tower, recovery water pump, second-stage tail-gas washing tower, second-stage tail-gas washing pump, tail-gas stack, atmospheric condenser, atmospheric condenser seal tank, vacuum pump, rotary table filter, weak phosphoric acid pump, return phosphoric acid pump, third-stage washing pump, filter cake washing water tank, filter cake washing pump, filter cloth washing water tank, filter cloth washing pump
- Flash chamber, vapor-liquid separator, condenser, condensate seal tank, heat exchanger, fluorosilicic acid vapor-liquid separator, fluoride scrubber, evaporation circulation filter, phosphoric acid circulation pump, concentrated phosphoric acid pump, fluoride absorption circulation pump, condensate pump
- Sulfuric acid storage tank, sulfuric acid pump tank, weak acid storage tank, cleaning liquid tank, product acid storage tank, fluorosilicic acid storage tank, sulfuric acid pump, evaporation feed pump, slurry pump, washing effluent discharge pump, cleaning liquid pump, product acid transfer pump, weak acid storage tank rake, product acid storage tank agitator
Delandi (Nantong) Machinery is dedicated to the development of the fertilizer industry, focusing on process design, production equipment manufacturing, and production performance improvement for fertilizer manufacturing projects. We bring together a team of experienced professionals with deep technical knowledge and long-term industry involvement.