Method for directly producing compound fertilizer by using phosphate tailings

A technology of compound fertilizer and production method, which is applied in the direction of urea compound fertilizer, ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, etc., which can solve the problems of long process and achieve the effects of fast reaction rate, reduced drying time and lower requirements

Inactive Publication Date: 2017-02-01
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the raw materials are dried, crushed, and mixed for reaction. The crushing process and the reaction process are two separate processes. Phosphorus tailings treatment and compound fertilizer preparation are two separate processes, and the process is relatively long.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1: direct production of low-concentration compound fertilizer from phosphorus tailings

[0064] The implementation steps of this embodiment are as follows:

[0065] A. Pretreatment

[0066] Will P 2 o 5 Phosphorus tailings with a mass fraction of 4.09% were dried at a temperature of 106°C for 1.8 hours and sieved to obtain low-grade phosphorus powder with a particle size of 0.13 mm. The water content of the obtained dry phosphorus tailings powder was measured by weight Below 5%;

[0067] B. Direct preparation of compound fertilizer from phosphorous tailings

[0068] 33.10g of phosphorous tailings treated in step A and 30.27g of mass fraction of 98% concentrated sulfuric acid were reacted in a mortar-type grinding mixer for 20min, 25.62g of phosphoric acid slag acid was added, and reacted for 20min, followed by adding 21.74g of urea and 14g of sulfuric acid Potassium, after adding the raw materials, continue to react for 10 minutes, take out the sample, d...

Embodiment 2

[0070] Embodiment 2: direct production of medium-grade compound fertilizer from phosphorous tailings

[0071] The implementation steps of this embodiment are as follows:

[0072] A. Pretreatment

[0073] Will P 2 o 5 Phosphorus tailings with a mass fraction of 5.01% were dried for 2.0 hours at a temperature of 104°C and sieved to obtain phosphorous tailings powder with a particle size of 0.68mm. The water content of the obtained dry phosphorous tailings powder was 5% by mass %the following;

[0074] B. Direct preparation of compound fertilizer from phosphorous tailings

[0075] 28.59g of phosphorus tailings and 23.72g of mass fraction 98% concentrated sulfuric acid were reacted in a mortar-type grinding mixer for 15min, 33.57g of phosphoric acid slag acid was added, and reacted for 20min, followed by adding 21.74g of urea and 20g of potassium sulfate, and the raw materials were added , continue to react for 10 minutes, take out the sample, dry, and pulverize to obtain pow...

Embodiment 3

[0077] Example 3: Direct production of high-grade compound fertilizer from phosphorous tailings

[0078] The implementation steps of this embodiment are as follows:

[0079] A. Pretreatment

[0080] Will P 2 o 5 Phosphorus tailings with a mass fraction of 6.65% were dried for 2.2 hours at a temperature of 108°C and sieved to obtain phosphorous tailings powder with a particle size of 0.38mm. The water content of the obtained dry phosphorous tailings powder was 5% by mass %the following;

[0081] B. Direct preparation of compound fertilizer from phosphorous tailings

[0082] 10.28g of phosphorus tailings and 5.02g of mass fraction 98% concentrated sulfuric acid were reacted in a mortar-type grinding mixer for 10min, 28.75g of phosphoric acid slag acid was added, and reacted for 20min, followed by adding 26.74g of urea, 30g of potassium sulfate, and 15g of diphosphate Ammonium, after adding raw materials and reacting for 10 minutes, a reaction mixture material is obtained, w...

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Abstract

The invention relates to a method for directly producing a compound fertilizer by using phosphate tailings. The method comprises the steps of pretreatment, sulfuric acid decomposition, compound fertilizer preparation and the like. The problem of comprehensive utilization of tailings produced after phosphorite raw ore concentration and phosphoric acid sludge acid produced in a wet process phosphoric acid process is effectively solved, elements in the phosphate tailings and the phosphoric acid sludge acid are recovered and utilized, and the method is in conformity with the comprehensive utilization principle 'reduction, reutilization and recycling'.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of fertilizer production. More specifically, the present invention relates to a method for directly producing compound fertilizer from phosphorous tailings. [0003] 【Background technique】 [0004] As a non-renewable resource, phosphorus resource is the basis for ensuring national food safety production. The world's phosphorus resources tend to be depleted after long-term mining, and high-grade phosphorus rocks are gradually decreasing. Phosphorus tailings are a by-product of phosphate ore sorting into concentrates, which contain a large amount of magnesium, calcium and a small amount of phosphorus, which are good plant nutrients. Recycling the valuable elements in the phosphorus tailings and processing them into fertilizers has high utilization value. It conforms to the principle of comprehensive utilization of tailings of "reduction, harmlessness, reuse, and recycling", and has certain economic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
CPCC05B5/00C05B17/00C05C9/00C05D1/02C05B7/00
Inventor 汤建伟王保明刘咏化全县刘丽禹鹤董盼远
Owner ZHENGZHOU UNIV
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