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Manufacturing method of high concentration enrich superphosphate phosphorus fertilizer

A technology rich in superphosphate and production methods, applied in the direction of superphosphate, phosphate fertilizer, fertilization equipment, etc., can solve the problems of high production cost, difficult operation control, long production process, etc., and achieve the effect of energy saving

Active Publication Date: 2009-02-18
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their studies are limited to the production of low concentrations of calcium-rich, general concentrations (effective P 2 o 5 ) can only reach about 24%, and the production process is long, the production cost is high, and the operation control is difficult
Most of the calcium-rich products currently produced in my country are limited to w(P 2 o 5 effective) 20% to 30%, related to w(P 2 o 5 Effective) ≥ 34% high-concentration calcium-enriched production and test rarely reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Raw materials: 1) phosphoric acid: raffinate phosphoric acid, w(P 2 o 5 )42.6%, solid content 4%;

[0015] 2) Sulfuric acid: industrial sulfuric acid, w(H 2 SO 4 )98%;

[0016] 3) Phosphate rock powder: the chemical composition is as follows (by weight)

[0017] composition P 2 o 5 CaO MgO SiO 2 Fe 2 o 3 F al 2 o 3 CO 2 Mineral powder fineness

-100 mesh content(%) 32.58 49.56 2.29 4.21 0.32 3.1 0.35 3.12 92.5

[0018] Contains P 2 o 5 29.4kg of raffinate phosphoric acid with a solid content of 42.6% and a solid content of 4% was measured by a flowmeter, and steam was introduced to make the phosphoric acid temperature reach 55°C, and then 30kg of phosphate rock powder was added, and after mixing and reacting with phosphoric acid in a mixer for 30s, added Sulfuric acid 7.5kg, after vigorously mixing sulfuric acid, phosphoric acid and phosphate rock powder in the reactor for 1min, the slurry flows into the co...

Embodiment 2

[0021] Raw materials: 1) phosphoric acid: raffinate phosphoric acid, w(P 2 o 5 )41.4%, solid content 6%;

[0022] 2) Sulfuric acid: industrial sulfuric acid, w(H 2 SO 4 )98%;

[0023] 3) Phosphate rock: the chemical composition is as follows (by weight)

[0024] composition P 2 o 5 CaO MgO SiO 2 Fe 2 o 3 F al 2 o 3 CO 2 Mineral powder fineness

-100 mesh content(%) 31.37 50.52 3.29 4.16 0.41 2.9 0.38 3.2 96.0

[0025] Contains P 2 o 5 30.5kg of raffinate phosphoric acid with a solid content of 41.4% and a solid content of 6% is measured by a flowmeter, and steam is introduced to make the phosphoric acid temperature reach 60°C, then 30kg of phosphate rock powder measured in proportion is added, and mixed with phosphoric acid in a mixer After 30 seconds, add 7.6kg of sulfuric acid measured in proportion, and vigorously mix sulfuric acid, phosphoric acid and phosphate rock powder in the reactor for 1 minute, and then...

Embodiment 3

[0028] Raw materials: 1) phosphoric acid: sludge phosphoric acid, w(P 2 o 5 )40.8%, solid content 8%;

[0029] 2) Sulfuric acid: industrial sulfuric acid, w(H 2 SO 4 )98%;

[0030] 3) Phosphate rock: the chemical composition is as follows (by weight)

[0031] composition P 2 o 5 CaO MgO SiO 2 Fe 2 o 3 F al 2 o 3 CO 2 Mineral powder fineness

-100 mesh content(%) 30.82 44.28 1.25 15.36 0.36 2.88 0.52 2.96 95.0

[0032] Contains P2 o 5 31.0kg of sludge phosphoric acid with a solid content of 40.8% and a solid content of 8% is measured by a flowmeter, and steam is introduced to make the phosphoric acid temperature reach 65°C, and then 30kg of phosphate rock powder measured in proportion is added, and mixed with phosphoric acid in a mixer After 30 seconds, add 7.5kg of sulfuric acid measured in proportion, and vigorously mix sulfuric acid, phosphoric acid and phosphate rock powder in the reactor for 1 minute, then the ...

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Abstract

The invention discloses a manufacturing method of high concentration rich superphosphate fertilizer, which comprises: phosphoric acid is used as raw material, steam is steamed to make the temperature of the phosphoric acid reach 55 to 65 DEG C, then phosphorite powder is added to be mixed, the amount of the phosphorite powder is 105 percent of calculated theoretical calculation amount according to phosphoric acid amount, after mixed reaction with the phosphoric acid in a mixer with 30s, 94 percent to 98 percent sulphuric acid is added, the mixed acid of the amount of the sulphuric acid mixed with the phosphoric acid is 62 percent to 68 percent, the sulphuric acid, the phosphoric acid and the phosphorite powder are severely mixed in a reactor for 1 min, material slurry flows into a turning chemical chamber to be solidified, the solidified time is 30 to 40min, the solidified temperature is 95 DEG C, after piling up and curing, powder-shaped material is added with water for pelleting, and the high concentration rich superphosphate fertilizer is obtained after drying and screening. The manufacturing method has the advantages of simple process flow, little equipment, simple and convenient operation, low manufacturing cost and easy realization of industrial manufacture.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for producing phosphate fertilizer. Background technique [0002] Superphosphate-rich phosphate fertilizer (hereinafter referred to as calcium-rich) can be regarded as effective P 2 o 5 Phosphate fertilizer products with a content between heavy calcium and superphosphate are usually produced by the acidification reaction of phosphate rock with a mixture of sulfuric acid and phosphoric acid. The main component of the product is Ca(H 2 PO 4 ) 2 ·H 2 O and CaSO 4 , followed by a small amount of free P 2 o 5 and H 2 O, effective P 2 o 5 According to different customer needs, there are mainly 24%, 26%, 28%, 30%, 32%, 34% and other specifications. Its production method is similar to ordinary calcium superphosphate, and it can also be produced by a heavy calcium plant. [0003] As early as the 1920s, the Soviet Union and the United States carried out research on mak...

Claims

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Application Information

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IPC IPC(8): C05B1/02
Inventor 胡宏杨三可解田沈有林王景峰李艳王鑫杨丽萍
Owner WENGFU (GRP) CO LTD
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