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Calcium magnesium polyphosphate fertilizer prepared from phosphoric acid and phosphorus tailings as raw materials and preparation method thereof

A technology of calcium polyphosphate and phosphate tailings, which is applied in calcium fertilizers, phosphate fertilizers, magnesium fertilizers, etc., can solve the problems of environmental pollution of phosphate tailings and low availability of magnesium, so as to improve the comprehensive utilization rate of resources and ensure reliable product quality. , The effect of simple production process

Active Publication Date: 2021-05-25
KINGENTA ECOLOGICAL ENG GRP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a calcium magnesium polyphosphate fertilizer prepared from wet-process phosphoric acid and phosphorus tailings as raw materials and a preparation method thereof, so as to solve the environmental pollution caused by the massive accumulation of phosphorus tailings, and the existing The technical problem of low effectiveness of phosphorus, calcium and magnesium in the phosphorus, magnesium and calcium fertilizer prepared by using phosphorus tailings as raw materials in the technology

Method used

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  • Calcium magnesium polyphosphate fertilizer prepared from phosphoric acid and phosphorus tailings as raw materials and preparation method thereof
  • Calcium magnesium polyphosphate fertilizer prepared from phosphoric acid and phosphorus tailings as raw materials and preparation method thereof
  • Calcium magnesium polyphosphate fertilizer prepared from phosphoric acid and phosphorus tailings as raw materials and preparation method thereof

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Effect test

Embodiment 1

[0034] A method for preparing calcium magnesium polyphosphate fertilizer using wet-process phosphoric acid and phosphorus tailings as raw materials, the used raw material indicators are as follows:

[0035] Wet-process phosphoric acid: w(P 2 o 5 ) 23.39%, w (MgO) 1.01%, w (CaO) 0.12%;

[0036] Phosphorus tailings: w(P 2 o 5 ) 7.07%, w (MgO) 16.2%, w (CaO) 35.11%;

[0037] Including the following steps:

[0038] (1) 100kg of phosphorus tailings and 400kg of wet-process phosphoric acid were mixed and reacted for 1.5h at normal temperature in a reactor to obtain a reaction mixture;

[0039] (3) Calcining the reaction mixture obtained above at 350° C. for 3.5 hours, and grinding to obtain the calcium magnesium polyphosphate product.

[0040] The product analysis results are as follows:

[0041]

Embodiment 2

[0043] A method for preparing calcium magnesium polyphosphate fertilizer using wet-process phosphoric acid and phosphorus tailings as raw materials, the used raw material indicators are as follows:

[0044] Wet-process phosphoric acid: w(P2O5) 22.39%, w(MgO) 1.23%, w(CaO) 0.15%;

[0045] Phosphorus tailings: w(P2O5)6.18%, w(MgO)15.23%, w(CaO)34.32%;

[0046] Including the following steps:

[0047] (1) 100kg of phosphorus tailings and 520kg of phosphoric acid were mixed and reacted for 2 hours at normal temperature in a reactor to obtain a reaction mixture;

[0048] (2) Concentrating the above reaction mixture at 80°C and 30kPa to a concentrated solution with a mass content of 44-45% of water in the slurry;

[0049] (3) Calcining the concentrated solution obtained above at 450° C. for 3 hours, and then grinding to obtain the calcium magnesium polyphosphate product.

[0050] The product analysis results are as follows:

[0051]

Embodiment 3

[0053] A method for preparing calcium magnesium polyphosphate fertilizer using wet-process phosphoric acid and phosphorus tailings as raw materials, the used raw material indicators are as follows:

[0054] Wet-process phosphoric acid: w(P 2 o 5 ) 22.39%, w (MgO) 1.33%, w (CaO) 0.19%;

[0055] Phosphorus tailings: w(P 2 o 5 ) 7.02%, w (MgO) 17.23%, w (CaO) 33.35%;

[0056] Including the following steps:

[0057] (1) 100kg of phosphorus tailings and 580kg of phosphoric acid were mixed and reacted for 1h at normal temperature in a reactor to obtain a reaction mixture;

[0058] (2) Concentrating the above-mentioned reaction mixture at 90°C and 30kPa to a concentrated solution with a mass content of 35-36% of water in the slurry;

[0059] (3) Calcining the concentrated solution obtained above at 600° C. for 2 hours and grinding to obtain the calcium magnesium polyphosphate product.

[0060] The product analysis results are as follows:

[0061]

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Abstract

The invention relates to a calcium magnesium polyphosphate fertilizer prepared from phosphoric acid and phosphorus tailings as raw materials and a preparation method thereof. The calcium magnesium polyphosphate fertilizer is prepared from phosphorus tailings and phosphoric acid as raw materials, and P 2 O 5 , MgO, and CaO, in this calcium magnesium polyphosphate fertilizer: total phosphorus 50‑68%, available phosphorus 47‑66%, total magnesium 5‑18%, available magnesium 4‑15%, total calcium 11%‑20%, Available calcium 10%‑18%, both in mass percent; with P 2 O 5 Calculated, the polymerization rate of the calcium magnesium polyphosphate fertilizer is more than or equal to 50%. The present invention also provides a preparation method of the above fertilizer. The phosphorus in the product prepared by the present invention has slow-release properties. When this product is applied to the soil, the phosphorus in it will not be fixed quickly, but slowly releases orthophosphate to meet the needs of crops. Also due to the effect of polyphosphoric acid, Magnesium and calcium are not easy to be leached by a large amount of water, especially suitable for crops with high demand for calcium and magnesium.

Description

technical field [0001] The invention belongs to the technical field of chemical fertilizer production, and in particular relates to a calcium magnesium polyphosphate fertilizer prepared from wet-process phosphoric acid and phosphorus tailings as raw materials and a preparation method thereof. Background technique [0002] Phosphorus tailings are unutilized solid waste discharged from phosphate ore flotation concentrate. The grade of raw phosphate rock in my country is not high, which has caused the phosphorus chemical industry to discharge a large amount of phosphorus tailings when phosphate rock flotation concentrates are produced. For every 3 tons of phosphate rock produced, 1 ton of phosphorus tailings is discharged. The massive accumulation of phosphorus tailings not only takes up a lot of land, but also causes environmental pollution. With the continuous development of my country's phosphorus chemical industry and the continuous increase of social demand, the accumulati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05B13/02C05G1/00
CPCC05B13/02C05B17/00C05B13/06C05D3/02C05D5/00
Inventor 胡兆平陈宏坤刘永秀郑建国王伯通李成志刘伟于南树郭宗端胡善明王招军
Owner KINGENTA ECOLOGICAL ENG GRP
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