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A production method for preparing tricalcium phosphate by-product special fertilizer for rye

A technology of tricalcium phosphate and production method, applied in chemical instruments and methods, applications, phosphorus compounds, etc., can solve problems such as affecting the yield and quality of rye planting, waste of nitrogen, phosphorus and potassium elements, and influence on the purity of tricalcium phosphate products. , to achieve significant environmental protection value and economic benefits, avoid the discharge of waste liquid, and make up for the cost of impurity removal

Inactive Publication Date: 2016-07-06
GUIZHOU KAILIN GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, when rye is planted, the fertilization of rye is to adopt traditional chemical fertilizers, such as urea, potassium chloride, ammonium nitrate, ammonium carbonate, ammonium chloride, etc., through a certain ratio, and then used for rye Fertilization for planting, it can be seen that this traditional rye fertilizer is difficult to meet the nutrient requirements of rye, because it is reported that the absorption rate of nitrogen, phosphorus and potassium in fertilizers by crops is limited, and a large amount of nitrogen will remain Phosphorus and potassium elements in the soil waste a lot of nitrogen, phosphorus and potassium resources, cause environmental pollution, affect the structural layer of the soil, and then affect the yield and quality of rye planting
[0003] At the same time, in the preparation process of tricalcium phosphate products, it is usually produced by crystallization and precipitation. This process often requires deep crystallization of tricalcium phosphate, thereby reducing the waste of elemental resources such as nitrogen, phosphorus, and calcium. Increase the output of tricalcium phosphate and reduce production costs; but this deep crystallization will affect the purity of tricalcium phosphate products, and then affect the quality of tricalcium phosphate products; and the amount of waste liquid after crystallization treatment is large, and it is also will cause environmental pollution

Method used

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  • A production method for preparing tricalcium phosphate by-product special fertilizer for rye
  • A production method for preparing tricalcium phosphate by-product special fertilizer for rye
  • A production method for preparing tricalcium phosphate by-product special fertilizer for rye

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Effect test

Embodiment 1

[0045] A production method for preparing tricalcium phosphate by-product special fertilizer for rye, comprising the following steps:

[0046] (1) Preparation of intermediate slurry: React phosphoric acid and carbonamide in a stirred reactor at a temperature of 110°C, and control the molar ratio of phosphoric acid and carbonamide to 1.7:1, stirring at a stirring speed of 45r / min After reacting for 30min, the intermediate slurry was obtained;

[0047] (2) Synthesis of tricalcium phosphate slurry: add a calcium hydroxide solution that is 1.2 times the molar weight of carbonamide into the intermediate slurry, and control the reaction temperature to 70°C. When the reaction reaches 30min, detect the pH value and wait for When the pH value is 8, the reaction is terminated, and it is transferred to a cooling crystallizer, and the temperature is lowered to 45°C, so that tricalcium phosphate crystals are precipitated, and the content of nitrogen, phosphorus, and calcium in the crystalli...

Embodiment 2

[0054] A production method for preparing tricalcium phosphate by-product special fertilizer for rye, comprising the following steps:

[0055] (1) Intermediate slurry preparation: use phosphoric acid and carbonamide to react in a stirred reactor at a temperature of 120°C, and control the molar ratio of phosphoric acid and carbonamide to 2.3:1, and stir at a stirring speed of 60r / min After reacting for 70min, intermediate slurry was obtained;

[0056] (2) Synthesis of tricalcium phosphate slurry: add calcium hydroxide solution with 1.7 times the molar weight of carbonamide to the intermediate slurry, and control the reaction temperature to 90°C. When the reaction reaches 70min, check the pH value and wait for When the pH value is 9, the reaction is terminated, and it is transferred to a cooling crystallizer, and the temperature is lowered to 40°C, so that tricalcium phosphate crystals are precipitated, and the content of nitrogen, phosphorus, and calcium in the crystallization l...

Embodiment 3

[0063] A production method for preparing tricalcium phosphate by-product special fertilizer for rye, comprising the following steps:

[0064] (1) Intermediate slurry preparation: use phosphoric acid and carbonamide to react in a stirred reactor at a temperature of 115°C, and control the molar ratio of phosphoric acid and carbonamide to 2:1, and stir at a stirring speed of 55r / min After reacting for 50min, the intermediate slurry was obtained;

[0065] (2) Synthesis of tricalcium phosphate slurry: add calcium hydroxide solution with 1.5 times the molar weight of carbonamide to the intermediate slurry, and control the reaction temperature to 80°C. When the reaction reaches 50min, detect the pH value, and wait for When the pH value is 8.5, the reaction is terminated, and it is transferred to a cooling crystallizer, and the temperature is lowered to 35°C, so that tricalcium phosphate crystals are precipitated, and the content of nitrogen, phosphorus, and calcium in the crystalliza...

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Abstract

The invention relates to the technical field of chemical engineering, particularly a production method for preparing tricalcium phosphate and coproducing a special fertilizer for rye. The effective absorption amounts of nitrogen, phosphorus and potassium are analyzed according to the fertilizer demanded by the rye, and the contents of the elements in the production process are regulated and matched, so that the prepared combined-state compound fertilizer can maximally satisfy the demands of rye, 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. By adjusting the component contents of the filtrate, the waste liquid in the chemical product production process is used as the raw material for producing the compound fertilizer, thereby avoiding the discharge of the waste liquid and lowering the production cost of the compound fertilizer. The production method has obvious environmental protection value and economic benefit.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing special fertilizer for tricalcium phosphate by-product rye. Background technique [0002] Rye, rich in nutrition, contains starch, fat and protein, vitamin B, phosphorus, potassium and so on. In addition to being used as flour, it can also be used to make oil, wine, and raise livestock. The stalks are also used for weaving hats and making paper. Due to the large amount of rye leaves, soft stems, rich nutrition and good palatability, it can also be used as high-quality forage grass for cattle, sheep and horses. However, at present, when rye is planted, the fertilization of rye is to adopt traditional chemical fertilizers, such as urea, potassium chloride, ammonium nitrate, ammonium carbonate, ammonium chloride, etc., through a certain ratio, and then used for rye Fertilization for planting, it can be seen that this traditional rye fer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C05G1/00
Inventor 廖吉星陈肖虎彭宝林高贵龙朱飞武薛涛王先炜
Owner GUIZHOU KAILIN GRP CO LTD
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