Method for preparing phosphorus-magnesium compound fertilizer by utilizing raffinate and phosphate tailings with high magnesium content

A technology of compound fertilizer and high magnesium phosphorus tail is applied in fertilizer mixture, application, fertilization device and other directions, which can solve the problems of low industrialization value, high cost of impurity removal, and high cost, so as to improve the comprehensive utilization rate of resources and reliable product quality. , the effect of improving utilization

Active Publication Date: 2011-08-24
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of raffinate recovery and utilization has always been considered a technical problem. Although there are many reports on the purification and removal of many impurity ions contained in raffinate, they have not fundamentally solved the problem of raffinate utilization. It mainly has the following problems: raffinate acid is a by-product after wet-process phosphoric acid purification, and then it is subjected to secondary impurity removal. It is difficult to remove impurity ions; when using some chemical methods to remove impurities in raffinate, it will inevitably lead to P in raffinate 2 o 5 The concentration is greatly reduced, and the industrial value is not large
[0005] At present, the existing production of phosphorus and magnesium compound fertilizers generally has problems such as high energy consumption and high cost.

Method used

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  • Method for preparing phosphorus-magnesium compound fertilizer by utilizing raffinate and phosphate tailings with high magnesium content
  • Method for preparing phosphorus-magnesium compound fertilizer by utilizing raffinate and phosphate tailings with high magnesium content
  • Method for preparing phosphorus-magnesium compound fertilizer by utilizing raffinate and phosphate tailings with high magnesium content

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] raw material:

[0016] 1) Raffinic acid: w(P 2 o 5 )46.0%, w(MgO)3.0%;

[0017] 2) Phosphorus tailings slag: w(P 2 o 5 ) 5.5%, w (MgO) 16.2%.

[0018] 1000g of by-product raffinate after purification by wet process phosphoric acid and 1001g of high-magnesium phosphorus tailings slag after drying and crushing are added to the reaction tank with agitator for acidification and mixing reaction, and 1.002g of surfactant dodecylbenzene is added Sodium sulfonate, the reaction temperature is controlled at 40°C during the reaction, and the reaction time is 20min. It is crushed and processed into powdery phosphorus and magnesium compound fertilizer products. The powder is agglomerated into granules by adding water on a disc granulator, dried, cooled, and sieved into a particle size of 1mm-4mm, which is a granular phosphorus-magnesium compound fertilizer product. The product quality analysis results are as follows:

[0019]

Embodiment 2

[0021] raw material:

[0022] 1) Raffinic acid: w(P 2 o 5 ) 44.6%, w (MgO) 5.4%;

[0023] 2) Phosphorus tailings slag: w(P 2 o 5 ) 7.0%, w (MgO) 19.0%.

[0024] 1202g of by-product raffinate after purification by wet process phosphoric acid and 1002g of high-magnesium phosphorus tailings slag after drying and crushing are added to the reaction tank with agitator for acidification and mixing reaction, and 0.1002g of surfactant dodecylbenzene is added Sodium sulfonate, the reaction temperature is controlled at 50°C during the reaction, and the reaction time is 15min. After the reaction, the material is unloaded and put into a porcelain plate, dried and cooled to room temperature at 100±5°C, and the material is dry and hardened. It is crushed and processed into powdery phosphorus and magnesium compound fertilizer products. The powder is agglomerated into granules by adding water on a disc granulator, dried, cooled, and sieved into a particle size of 1mm-4mm, which is a gran...

Embodiment 3

[0027] raw material:

[0028] 1) Raffinic acid: w(P 2 o 5 )44.1%, w(MgO)6.0%;

[0029] 2) Phosphorus tailings slag: (P 2 o 5 ) 5.4%, w (MgO) 17.2%.

[0030] 1300g of by-product raffinate after purification by wet-process phosphoric acid and 1003g of high-magnesium phosphorus tailings slag after drying and crushing were added to the reaction tank with agitator for acidification and mixing reaction, and 0.1003g of surfactant AES was added. The reaction process The reaction temperature is controlled at 45°C, and the reaction time is 10 minutes. After the reaction, the material is unloaded and put into a porcelain plate, dried and cooled to room temperature at 100±5°C, the material is dry and hardened, and it is crushed and processed into powder Phosphate and magnesium compound fertilizer products. The powder is agglomerated into granules by adding water on a disc granulator, dried, cooled, and sieved into a particle size of 1mm-4mm, which is a granular phosphorus-magnesium ...

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Abstract

The invention discloses a method for preparing a phosphorus-magnesium compound fertilizer by utilizing raffinate and phosphate tailings with high magnesium content. The method comprises the following steps of: drying and crushing 1,001 to 1,003 parts of phosphate tailings with high magnesium content which contains 4 to 7 mass percent of P2O5 and 15 to 19 mass percent of MgO, mixing and reacting with 700 to 1,300 parts of byproduct of the purification of wet-process phosphoric acid, namely the raffinate which contains 42 to 46 mass percent of P2O5 and 3 to 6 mass percent of MgO in a reactor, and adding 0.1002 to 1.002 parts of surfactant, wherein the reaction time is 10 to 20min, and the reaction temperature is controlled to be between 40 and 60 DEG C; drying a fresh phosphorus-magnesium compound fertilizer obtained after the reaction at the temperature of 100+/-5 DEG C; and crushing and directly packaging to obtain a powdered phosphorus-magnesium compound fertilizer product. By the method, the resource of raw materials is wide, energy consumption is low, production period is short, and the quality of the product is reliable.

Description

technical field [0001] The invention belongs to the technical field of chemical fertilizer production, and in particular relates to a method for preparing a phosphorus-magnesium compound fertilizer by using raffinate as a by-product of wet-process phosphoric acid purification and high-magnesium phosphorus tailings slag as raw materials. Background technique [0002] One way to purify phosphoric acid is to use extractant to extract phosphoric acid from wet-process phosphoric acid to achieve the purpose of purification, and the remaining acid after extraction is called raffinate. Its main components: P 2 o 5 42-46%, MgO 3-6%. The problem of raffinate recovery and utilization has always been considered a technical problem. Although there are many reports on the purification and removal of many impurity ions contained in raffinate, they have not fundamentally solved the problem of raffinate utilization. It mainly has the following problems: raffinate acid is a by-product aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00B09B3/00
Inventor 解田胡宏高晓明刘旭李艳赵杰贾双珠史春英
Owner WENGFU (GRP) CO LTD
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