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Method for producing superphosphate and compound fertilizer thereof by means of concentrated acid slag powder method

A technology of calcium superphosphate and compound fertilizer, which is applied in the direction of calcium superphosphate, phosphate fertilizer, chemical instruments and methods, etc., can solve the problems of occupying space and site, and achieve the effects of saving investment, weakening corrosion, and improving physical properties

Inactive Publication Date: 2013-05-08
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is of great help to the utilization of low-grade phosphate rock and the improvement of the utilization rate of phosphorus resources, it needs to be placed for a period of time after the phosphate rock is pulverized and takes up space; this method also uses dilute sulfuric acid to mix acid and ore. Not much different from traditional crafts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Preparation of calcium superphosphate by concentrated acid mineral powder method: dry, crush, sieve and other pretreatments on phosphate rock to obtain phosphate rock powder with a fineness of 0.09mm-0.147mm (100 mesh-200 mesh). Add 100 parts of phosphate rock powder (P2 o 5 23.86%), stirred and ground for 30 minutes with theoretically used sulfuric acid of 95% mass (mass concentration 98%), and formed for 60 minutes. Sampling was carried out to determine the conversion rate of available phosphorus, moisture and free acid content: the conversion rate of available phosphorus was 77.4% by mass, free acid was 18.2% by mass, and moisture was 4.2% by mass.

Embodiment 2

[0017] Preparation of superphosphate by concentrated acid mineral powder method: dry, crush, sieve and other pretreatments on phosphate rock to obtain phosphate rock powder with a fineness of 0.10mm-0.147mm (100 mesh-200 mesh). Add 100 parts of phosphate rock powder (P 2 o 5 23.86%), stirred and mixed with sulfuric acid (mass concentration 93%) of theoretical mass 105% for 30 minutes, and left to form for 30 minutes. Then take a sample and measure its available phosphorus conversion rate, moisture and free acid content: available phosphorus conversion rate is 73.7% mass fraction, free acid is 19.3% mass fraction, and moisture is 6.0% mass fraction.

Embodiment 3

[0019] Calcium superphosphate-based compound fertilizer: dry, pulverize, and sieve phosphate rock to obtain phosphate rock powder with a fineness of 0.09mm-0.147mm (100mesh-200mesh), and add it to the stirring and grinding reactor 100 parts phosphate rock powder (P 2 o 5 23.86%), when stirring and grinding with sulfuric acid (mass concentration 98%) with a theoretical mass of 105% for 5 minutes, add 42 parts of potassium chloride, continue grinding for 25 minutes, add 3.8 parts of magnesium oxide to neutralize the free acid in the system And processing, finally add 52 parts of urea, grind and mix for 30 minutes, and then turn into 30 minutes. Then samples were taken to determine the conversion rate of available phosphorus, moisture, total nitrogen, and soluble K 2 O, free acid and total nutrient content: available phosphorus conversion rate 74.3% mass fraction, moisture 6.1% mass fraction, free acid 9.1% mass fraction. Nutrient mass fraction of compound fertilizer (wet mat...

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Abstract

The invention discloses a method for producing superphosphate and a compound fertilizer of the superphosphate by means of concentrated acid powder slag method, and belongs to the field of agricultural fertilizer. The superphosphates compound fertilizer is directly prepared by subjecting the mixing process of concentrated sulfuric acid and phosphorite to mechanical stirring and grinding force and organically combining the preparation and neutralization pretreatment of the superphosphate and the preparation of the compound fertilizer, complex process flow is prevented, production efficiency is improved, and production cost is reduced.

Description

technical field [0001] The invention relates to a method for producing calcium superphosphate and a compound fertilizer thereof by a concentrated acid mineral powder method, belonging to the field of agricultural chemical fertilizers. Background technique [0002] The main component of superphosphate is calcium dihydrogen phosphate Ca(H 2 PO 4 ) 2 and gypsum CaSO 4 2H 2 O with effective P 2 o 5 14% to 20%, of which 80% to 95% are soluble in water. It is a water-soluble quick-acting phosphate fertilizer. It also contains sulfur, calcium, magnesium and other medium elements required by crops. It can be directly used as phosphate fertilizer or compound fertilizer. [0003] At present, the production of superphosphate mainly adopts two processes: dilute acid mineral powder method and concentrated acid mineral pulp method. Dilute acid ore powder method is to mix the pre-dried and crushed phosphate rock with a certain concentration of dilute sulfuric acid in a mixer, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C05G1/00C05B1/02
Inventor 汤建伟化全县刘咏刘丽位南南高德振
Owner ZHENGZHOU UNIV
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