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Calcium magnesium nitrate composition and preparation method thereof

A technology of calcium and magnesium nitrate and composition, which is applied in the direction of fertilizer mixture, urea compound fertilizer, nitrogen fertilizer, etc., can solve the problems of increased investment cost, complicated process, and reduced strength, so as to achieve good crop quality, low nutrient cost, and save beneficiation cost Effect

Inactive Publication Date: 2018-06-01
GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method needs to undergo two pressure filtration treatments, the process is relatively complicated, and the investment cost is increased, and the filter residue of the two pressure filtrations is not fully utilized, and the filtrate of the first pressure filtration needs to be neutralized by adding lime or calcium hydroxide, which increases the production cost.
In the production process of existing compound fertilizer granules, when ammonium nitrate and urea are mixed, the granules will gradually pulverize in a short period of time, and the strength will decrease, thus affecting the quality of fertilizers
[0003] There is no production method of using the leaching solution of chemical beneficiation to prepare high-calcium-magnesium fertilizer in foreign countries and China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Calcinate 200kg of medium and low-grade phosphate rock raw materials at 900-1000°C, then grind them so that the average particle size after grinding is 0.5mm, and then add 83kg of dilute nitric acid with a mass concentration of 60% for leaching at a temperature of 60-70°C. After leaching for 3 hours, leaching to a pH of 4.5, pressure filtering, washing, and drying, the phosphorous concentrate can be obtained. Then the leaching solution discharged from the filter press is used as the raw material of the calcium magnesium nitrate composition, and the raw material of the calcium magnesium nitrate composition is concentrated to 150-160° C. to obtain a concentrated slurry, and the slurry in the concentration section is sent to a spray drying tower, The anhydrous calcium magnesium nitrate composition A can be obtained by spray drying with hot furnace gas.

Embodiment 2

[0039] Calcinate 200kg of medium and low-grade phosphate rock raw materials at 900-1000°C, then grind them so that the average particle size after grinding is 0.2mm, and then add 85kg of dilute nitric acid with a mass concentration of 55% for leaching at a temperature of 60-70°C. After leaching for 3 hours, leaching to a pH of 4.5, pressure filtering, washing, and drying, the phosphorous concentrate can be obtained. Then the leaching solution discharged from the filter press is used as the raw material of the calcium magnesium nitrate composition, and the raw material of the calcium magnesium nitrate composition is concentrated to 150-160° C. to obtain a concentrated slurry, and the slurry in the concentration section is sent to a spray drying tower, The anhydrous calcium magnesium nitrate composition B can be obtained by spray drying with hot furnace gas.

Embodiment 3

[0041]Calcinate 200kg of medium and low-grade phosphate rock raw materials at 900-1000°C, then grind them so that the average particle size after grinding is 1mm, and then add 90kg of dilute nitric acid with a mass concentration of 52% for leaching at a temperature of 60-70°C. After 3 hours of extraction, leaching to pH 4.5, pressure filtration, washing, and drying, the phosphorous concentrate can be obtained. Then the leaching solution discharged from the filter press is used as the raw material of the calcium magnesium nitrate composition, and the raw material of the calcium magnesium nitrate composition is concentrated to 150-160° C. to obtain a concentrated slurry, and the slurry in the concentration section is sent to a spray drying tower, The anhydrous calcium and magnesium nitrate composition C can be obtained by spray drying with hot furnace gas.

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PUM

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Abstract

The invention provides a calcium magnesium nitrate composition. The preparation method for the calcium magnesium nitrate composition comprises the following steps: step 1, subjecting a medium-and-low-grade phosphate rock raw material to high-temperature calcination, and after completion of calcination, grinding the medium-and-low-grade phosphate rock, wherein the average particle size of the ground medium-and-low-grade phosphate rock is less than 5 mm; step 2, adding diluted nitric acid into the ground medium-and-low-grade phosphate rock obtained in the step 1, and carrying out extraction so as to obtain a slurry, wherein the temperature of extraction is 60 to 70 DEG C, and the weight ratio of the diluted nitric acid to the medium-and-low-grade phosphate rock is (3.0-4.5): 10; and step 3,adjusting a pH value of the slurry to 4.5 to 5.5, then carrying out press filtering so as to obtain an extract, and subjecting the extract to concentration and drying so as to obtain the calcium magnesium nitrate composition which can be used as a raw material for production of a urea calcium magnesium nitrate fertilizer and a calcium and magnesium enriched fertilizer. The preparation method provided by the invention utilizes the extract obtained from chemical benefication of the medium-and-low-grade phosphate rock to prepare a fertilizer, and has the advantages of low cost, environmental protection, simple process and good product fertilizer efficiency.

Description

technical field [0001] The invention belongs to the technical field of fertilizer preparation, and in particular relates to a calcium-magnesium nitrate composition, a urea calcium-magnesium nitrate fertilizer, a calcium-magnesium-rich fertilizer and a preparation method thereof. Background technique [0002] Phosphate rock is a non-renewable resource. my country has a large reserve of phosphate rock resources, with few rich ore and many low-grade ore. With the depletion of rich ore resources, phosphate fertilizer production has to rely on lean ore resources with more impurities. The current technology is to directly use phosphorus tailings as raw materials, first make tailings slurry, add nitric acid to react, press filter, add lime or calcium hydroxide to the filtrate discharged from the filter press to neutralize to pH 6.5-7, and then Filtrate, and the filtrate is vacuum-concentrated to obtain calcium-magnesium nitrate fertilizer. This treatment method needs to undergo t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
CPCC05B17/00C05C9/00C05C11/00
Inventor 方进顾春光任光耀黄仕英
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD