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Method for improving calcium hydrophosphate produced feed and fertilizer ratio

A calcium hydrogen phosphate, calcium hydrogen phosphate thick slurry technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as calcium dihydrogen phosphate hydrolysis treatment, and achieve the effect of increasing the feed-to-fertilizer ratio

Inactive Publication Date: 2011-04-06
KUNMING CHUAN JINNUO CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies mainly focus on increasing the feed-to-fertilizer ratio by controlling wastewater discharge phosphorus and controlling the weight of white manure in the production process, without treating the water-soluble phosphorus in white manure itself and the hydrolysis of calcium dihydrogen phosphate in the separation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A method for improving the feed-to-fertilizer ratio of calcium hydrogen phosphate production, the invention is to increase the temperature of centrifugal slurry, reduce the concentration of fertilizer-grade calcium hydrogen phosphate slurry, and reduce the hydrolysis of calcium dihydrogen phosphate in the slurry to increase the feed-to-fertilizer ratio; the steps of the method include:

[0013] ① Add water to dilute the thick slurry in the fertilizer grade calcium hydrogen phosphate (i.e. white fertilizer) thick slurry storage tank, and control the specific gravity (density) of the slurry to 1.06g / ml;

[0014] ②Introduce steam into the diluted white fat thick slurry to heat, and control the temperature of the slurry to 45°C;

[0015] ③Separate the above-mentioned controlled slurry through a centrifuge, and add water to wash it while the centrifuge is distributing, so that the specific gravity of the slurry is 1.03g / ml;

[0016] ④ After the centrifuge is filled with mat...

Embodiment 2

[0020] Improve the feed-to-fertilizer ratio of calcium hydrogen phosphate production according to the following method steps:

[0021] ① Add water to dilute the thick slurry in the white fertilizer thick slurry storage tank, and control the specific gravity (density) of the slurry to 1.04g / ml;

[0022] ②Introduce steam into the diluted white fat thick slurry for heating, and control the temperature of the slurry to 50°C;

[0023] ③Separate the above-mentioned controlled slurry through a centrifuge, and add water to wash it while the centrifuge is distributing, so that the specific gravity of the slurry is 1.05g / ml;

[0024] ④ After the centrifuge is filled with materials, continue to add water to wash the white fertilizer filter cake.

Embodiment 3

[0026] Improve the feed-to-fertilizer ratio of calcium hydrogen phosphate production according to the following method steps:

[0027] ① Add water to dilute the thick slurry in the white fertilizer thick slurry storage tank, and control the specific gravity (density) of the slurry to 1.05g / ml;

[0028] ②Introduce steam into the diluted white fat thick slurry for heating, and control the temperature of the slurry to 48°C;

[0029] ③Separate the above-mentioned controlled slurry through a centrifuge, and add water to wash it while the centrifuge is distributing, so that the specific gravity of the slurry is 1.04g / ml;

[0030] ④ After the centrifuge is filled with materials, continue to add water to wash the white fertilizer filter cake.

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Abstract

The invention relates to a method for improving calcium hydrophosphate produced feed and fertilizer ratio. The concentration of fertilizer grade calcium hydrophosphate slurry is reduced by improving the centrifugal slurry temperature, and the feed fertilizer ratio is reduced by reducing the hydrolyzation of calcium dihydrogen in the slurry. The method comprises the steps of: adding water to a thick fertilizer grade calcium hydrophosphate slurry storage tank to dilute the thick fertilizer grade calcium hydrophosphate slurry; controlling the specific gravity of the slurry to be 1.04 g / ml to 1.06 g / ml; introducing vapor to the thick fertilizer grade calcium hydrophosphate for heating; controlling the temperature of the slurry to be 45 DEG C to 50 DEG C; centrifuging the controlled slurry by a centrifuge; distributing material by the centrifuge and adding water for washing so that the specific gravity of the slurry is 1.03 g / ml to 1.05 g / ml; and continuously adding the water for washing a fertilizer grade calcium hydrophosphate filtration cake after charging the centrifuge. The method can reduce water-soluble phosphorus of the fertilizer grade calcium hydrophosphate within 2.5% from 5% approximately and effectively enhance the feed and fertilizer ratio.

Description

technical field [0001] The invention belongs to the technical field of a method for improving feed-grade calcium hydrogen phosphate feed-to-fertilizer ratio. Background technique [0002] At present, the value of elemental phosphorus in feed-grade calcium hydrogen phosphate is about 10 times that of fertilizer-grade calcium hydrogen phosphate. In terms of resources, the quality of phosphate rock is deteriorating at present. In order to improve the effective utilization rate of phosphorus, it is necessary to convert the phosphorus in fertilizer grade calcium hydrogen phosphate into feed grade calcium hydrogen phosphate as much as possible, that is, it is necessary to increase the feed-to-fertilizer ratio to Increase the value of phosphorus, increase the utilization rate of phosphorus, maximize the profit of enterprises, and fully utilize resources. How to effectively improve the feed-to-fertilizer ratio, various production enterprises have explored one after another, and cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 冯发钧曾润国魏家贵刘甍
Owner KUNMING CHUAN JINNUO CHEM IND
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