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A method for improving the release efficiency of phosphorus in phosphate fertilizers

A technology for releasing efficiency and phosphorus elements, which is applied in the field of improving the release efficiency of phosphorus elements in phosphate fertilizers. It can solve the problems of low phosphorus element release efficiency, energy consumption, and environmental pollution, and achieve the effects of avoiding heavy metal pollution, low cost, and reducing production costs.

Active Publication Date: 2016-03-30
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, these two methods not only consume a lot of energy in the process of producing phosphate fertilizers, but also cause excessive use of phosphate fertilizers that inevitably contain a small amount of heavy metal elements, and the low release efficiency of phosphorus elements is very likely to cause environmental pollution

Method used

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  • A method for improving the release efficiency of phosphorus in phosphate fertilizers

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Select apatite ore according to the above-mentioned scheme. After testing, the apatite mineral content is 85%, and the others are silicate minerals. Grind 500 grams of apatite ore to 200 mesh. During the grinding process, add grinding aids, The content of heavy metal ion in described grinding aid is lower than the corresponding heavy metal ion content in national soil environment GB15618-1995 national standard, then as figure 1 Shown: Stir and mix with 1000 grams of water in a small closed water tank, and slowly pump carbon dioxide into the small closed water tank. Under the condition of one atmospheric pressure, the volume of carbon dioxide gas pumped in per cubic meter of water per minute is greater than one Cubic meters, after 3 hours until the partial pressure of the pumped carbon dioxide gas is 4 atmospheres, then maintain 4 atmospheres for 2 hours, then open the water tank, introduce the mixture into a tall measuring cylinder, settle for 2 hours, add 50 grams of Ca...

Embodiment 2

[0028] Select apatite ore according to the above plan. After testing, the apatite mineral content is 90%, and the others are silicate minerals. Grind 10 kg of apatite ore to 200 mesh, and stir and mix with 20 kg of water in a closed tank , then then as in figure 1 Shown: Slowly pump carbon dioxide into a closed water tank. Under the condition of one atmospheric pressure, the volume of carbon dioxide gas pumped in per cubic meter of water per minute is greater than one cubic meter. After 6 hours, until the partial pressure of carbon dioxide gas is four Atmospheric pressure, then maintain 4 atmospheric pressure for 4 hours, then open the water tank, introduce the mixture into the sedimentation tank, settle for 4 hours, sprinkle 1 kg of slaked lime into the sedimentation tank, then settle for 4 hours again, and then partly export the water body for recycling , Dry the precipitate in the sun, and finally grind it to 100 mesh powder.

[0029] Do a control test with a well-known br...

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Abstract

The invention relates to a method for improving the release efficiency of phosphorus in phosphate fertilizers, comprising (1) selecting apatite ore with low content of heavy metal cations; (2) drying the apatite ore at a temperature of 60°C, and then grinding to Pass through a 200-mesh sieve to obtain apatite powder; (3) Mix the apatite powder and water in a sealed water tank, and pump carbon dioxide gas from the bottom of the sealed water tank while stirring (4) Put the apatite The water body is introduced into the sedimentation tank, and the slaked lime powder is put in until the pH value of the apatite water body is 7, and then precipitated; (5) Preparation of phosphate fertilizer: the sediment is filtered and separated from the water body, and then dried in the sun or heated, and then ground Pass through a 100-mesh sieve to obtain the final product phosphate fertilizer. The invention has the advantages of no impact on the environment, low cost, and the release efficiency of phosphorus as a phosphate fertilizer is 40% higher than that of phosphate fertilizers on the market, and can effectively avoid the enrichment of soil heavy metals caused by excessive use of phosphate fertilizers.

Description

technical field [0001] The invention relates to a method for improving the release efficiency of phosphorus elements in phosphate fertilizers, and belongs to the technical field of mineral fertilizers. Background technique [0002] The chemical formula of apatite is Ca 10 (PO 4)6 (Cl,OH,F) 2 , where the hydroxyapatite Ca 10 (PO 4 ) 6 (OH) 2 most common. Apatite belongs to the hexagonal crystal system, with a in the crystal axis 0 =0.943~0.938nm, c 0 =0.688~0.686nm. The basic characteristics of the crystal structure are that the Ca-O polyhedron is in the shape of a triangular column, and the irregular chains connected by edges and corners extend along the c-axis, and the chains are separated by [PO 4 ] link to form a channel parallel to the c-axis, additional anion Cl - , F - , OH - Fillings in this channel are also arranged in chains with highly variable coordinates and absent disorder-order. OH—Ca coordinates Ca at the corner top of the octahedron, and the fou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05B11/00
CPCC05B17/00
Inventor 李真
Owner NANJING AGRICULTURAL UNIVERSITY