Production method of special fertilizer for preparing calcium hydrogen phosphate and coproducing pepper

A technology of calcium hydrogen phosphate and production method, applied in the directions of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc., can solve the problems of insufficient purity, environmental pollution, insufficient utilization rate of waste liquid, etc. The effect of avoiding the discharge of waste liquid, significant environmental protection value and economic benefit

Inactive Publication Date: 2015-01-14
GUIZHOU KAILIN GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the production process of calcium hydrogen phosphate products, the mother liquor containing a large amount of nitrogen and phosphorus raw materials is often discharged into the environment, causing environmental pollution. Although the Environmental Protection Bureau currently controls the discharge of pollution indicators in chemical industry waste liquid, but It is still difficult to avoid the improper treatment of waste liquid in the chemical process and discharge to remove the pollution of the environment. The main reason for this is the insufficient utilization of the waste liquid in the chemical process. The nutritional elements required in the process, the analysis and exploration of the absorption of nitrogen, phosphorus, pota...

Method used

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  • Production method of special fertilizer for preparing calcium hydrogen phosphate and coproducing pepper
  • Production method of special fertilizer for preparing calcium hydrogen phosphate and coproducing pepper
  • Production method of special fertilizer for preparing calcium hydrogen phosphate and coproducing pepper

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A production method for preparing calcium hydrogen phosphate byproduct pepper special fertilizer, specifically comprising the following steps:

[0053] (1) Preparation and mixing of raw materials: Phosphoric acid and carbonamide are placed in a stirred reactor at a molar ratio of 1.9:1, at a temperature of 90°C, and the stirring speed of the stirred tank is controlled at 180r / min to stir and mix for 3 hours to obtain an intermediate slurry;

[0054] (2) Preparation of calcium hydrogen phosphate: then add soluble calcium salt into the reaction kettle containing the intermediate slurry obtained in step 1) at a constant speed for 2 h, control the pH value to 5.5, continue stirring and reacting for 5 min, and the reaction ends to obtain Slurry containing calcium hydrogen phosphate;

[0055] (3) Cyclic crystallization filtration: place the slurry containing calcium hydrogen phosphate obtained in step 2) in a cooling crystallizer to cool down to a temperature of 15°C within ...

Embodiment 2

[0062] A production method for preparing calcium hydrogen phosphate byproduct pepper special fertilizer, specifically comprising the following steps:

[0063] (1) Preparation and mixing of raw materials: Phosphoric acid and carbonamide are placed in a stirred reactor at a molar ratio of 2.3:1, at a temperature of 110°C, and the stirring speed of the stirred tank is controlled at 200r / min to stir and mix for 4 hours to obtain an intermediate slurry;

[0064] (2) Preparation of calcium hydrogen phosphate: Add soluble calcium salt 3h at a constant speed into the reaction kettle containing the intermediate slurry obtained in step 1), control the pH value to 6.5, continue to stir and react after 15min, and the reaction ends to obtain Slurry containing calcium hydrogen phosphate;

[0065] (3) Cyclic crystallization and filtration: place the slurry containing calcium hydrogen phosphate obtained in step 2) in a cooling crystallizer to cool down to a temperature of 10° C. within 20 se...

Embodiment 3

[0072] A production method for preparing calcium hydrogen phosphate byproduct pepper special fertilizer, specifically comprising the following steps:

[0073] (1) Preparation and mixing of raw materials: Put phosphoric acid and carbonamide at a molar ratio of 2.1:1 in a stirred reactor at a temperature of 100°C and control the stirring speed of the stirred tank at 190r / min to stir and mix for 3.5 hours to obtain intermediate body slurry;

[0074] (2) Preparation of calcium hydrogen phosphate: Add soluble calcium salt into the reaction kettle containing the intermediate slurry obtained in step 1) at a constant speed for 2.5 h, control the pH value to 6, continue stirring and reacting for 10 min, and the reaction ends. Obtain the slurry containing calcium hydrogen phosphate;

[0075] (3) Cyclic crystallization and filtration: place the slurry containing calcium hydrogen phosphate obtained in step 2) in a cooling crystallizer to cool down to a temperature of 13°C within 20s, coo...

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Abstract

The invention relates to the technical field of chemical engineering, particularly a production method of a special fertilizer for preparing calcium hydrogen phosphate and coproducing pepper. The effective absorption amounts of nitrogen, phosphorus and potassium are analyzed according to the fertilizer demanded by the pepper, the contents of the nitrogen, phosphorus and calcium in the production process are regulated and matched, and the potassium component and other minor element compounds are added, so that the prepared combined-state compound fertilizer can maximally satisfy the demands of pepper and can be completely absorbed by the pepper (the absorption rate is up to 96.1%), thereby lowering the overhigh cost due to improper element matching in the compound fertilizer production and further avoiding the environment pollution due to solidification of the compound fertilizer since excessive elements are added into the soil.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing a special fertilizer for calcium hydrogen phosphate by-product pepper. Background technique [0002] Pepper, also known as: Meiluzhi, Pilei, Poware, etc., Latin scientific name: Piper nigrum L belongs to the order Piper, Piperaceae, and Piper are woody climbing vines; pepper fruits contain a variety of amide compounds, which can dispel fishy smell and detoxify It is greasy, helps digestion, increases appetite, treats wind and cold, invigorates the spleen and stomach, detoxifies shrimp, and has a wide range of uses. At present, the cultivation technology of pepper is relatively common. The compound fertilizer used in the cultivation process is the traditional compound fertilizer, that is, a variety of chemical fertilizers are used to prepare according to a certain ratio, such as potassium dihydrogen phosphate and ammonium dihydrogen phos...

Claims

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Application Information

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IPC IPC(8): C01B25/32C05G1/00C05B7/00
Inventor 魏发展陈肖虎廖吉星高贵龙朱飞武薛涛蔺忠建赵伟毅曾舒
Owner GUIZHOU KAILIN GRP CO LTD
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