Production method for preparing calcium hydrogen phosphate and by-producing special fertilizer for cucurbit

A technology of calcium hydrogen phosphate and production methods, applied in the direction of chemical instruments and methods, applications, phosphorus compounds, etc., can solve the problems of low raw material recovery rate, large waste of resources, high production costs, etc., to reduce production costs and avoid waste liquid emission, quality assurance effect

Inactive Publication Date: 2015-01-21
GUIZHOU KAILIN GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the researchers combined the preparation process of calcium hydrogen phosphate products and analyzed the crystallization process of calcium hydrogen phosphate, and found that there are excessive crystallization and low purity in the traditional calcium hydrogen phosphate preparation process; shallow crystallization and high purity , but the recovery rate of raw materials is low, the waste of resources is large, and the production cost is relatively high

Method used

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  • Production method for preparing calcium hydrogen phosphate and by-producing special fertilizer for cucurbit
  • Production method for preparing calcium hydrogen phosphate and by-producing special fertilizer for cucurbit
  • Production method for preparing calcium hydrogen phosphate and by-producing special fertilizer for cucurbit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A production method for preparing calcium hydrogen phosphate by-product gourd special fertilizer, comprising the following steps:

[0045] (1) Preparation and mixing of raw materials: Phosphoric acid and carbonamide are placed in a stirred reactor at a molar ratio of 1.5:1, at a temperature of 100°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;

[0046] (2) Preparation of calcium hydrogen phosphate: Add alkaline calcium salt into the reaction kettle containing the intermediate slurry obtained in step 1) at a uniform speed for 2 hours, control the pH value to 5.5, continue stirring for 5 minutes, and then finish the reaction to obtain Slurry containing calcium hydrogen phosphate;

[0047] (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 15 seconds, coo...

Embodiment 2

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

[0055] (1) Preparation and mixing of raw materials: Phosphoric acid and carbonamide are placed in a stirred reactor at a molar ratio of 2.1:1, at a temperature of 130°C, and the stirring speed of the stirred tank is controlled at 200r / min to stir and mix for 5 hours to obtain an intermediate slurry;

[0056] (2) Preparation of calcium hydrogen phosphate: Add alkaline calcium salt into the reaction kettle containing the intermediate slurry obtained in step 1) at a constant speed for 3 h, control the pH value to 6.5, continue stirring and reacting for 20 min, and the reaction ends to obtain Slurry containing calcium hydrogen phosphate;

[0057] (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 15s, cool d...

Embodiment 3

[0064] A production method for preparing calcium hydrogen phosphate by-product gourd special fertilizer, comprising the following steps:

[0065] (1) Preparation and mixing of raw materials: Put phosphoric acid and carbonamide at a molar ratio of 1.7:1 in a stirred reactor at a temperature of 110°C and control the stirring speed of the stirred tank at 190r / min to stir and mix for 4 hours to obtain an intermediate slurry;

[0066] (2) Preparation of calcium hydrogen phosphate: Add alkaline calcium salt at a constant speed for 2.5h into the reaction kettle containing the intermediate slurry obtained in step 1), control the pH value to 6, continue stirring and reacting for 15min, and the reaction ends. Obtain the slurry containing calcium hydrogen phosphate;

[0067] (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 14°C within 15s, cool down to cyclic c...

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Abstract

The invention relates to the technical field of chemical industry, and particularly relates to a production method for preparing calcium hydrogen phosphate and by-producing a special fertilizer for cucurbit. According to the production method, the effective absorption amount of nitrogen, phosphorus and potassium elements is analyzed according to the fertilizer requirement of cucurbit, and element content is regulated and collocated in a production process course, so that a prepared compounded-form compound fertilizer can furthest meet the requirement of the cucurbit, excessively high cost caused due to improper element collocation in the production of the compound fertilizer is reduced, and environmental pollution caused by that the compound fertilizer is solidified by adding excessive elements to soil is further prevented; and a high-purity calcium hydrogen phosphate product can be produced in the preparation process of the special fertilizer for the cucurbit by controlling the process condition of the production, so that the impurity removal cost needed when the calcium hydrogen phosphate product is prepared by adopting the traditional wet-process phosphoric acid method is made up, the purity of the calcium hydrogen phosphate product reaches more than 96%, the production cost is reduced, and outstanding economic benefit is achieved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing calcium hydrogen phosphate by-product gourd special fertilizer. Background technique [0002] Gourd, Latin scientific name: Lagenariasiceraria (Molina) Standl. belongs to Cucurbitaceae, Cucurbita, it is a climbing vine plant, an annual climbing herb, with soft hairs, white flowers in summer and autumn, monoecious, the vines of gourds can reach 15 meters long , the fruit can range from 10 centimeters to one meter, and the heaviest can reach one kilogram. According to testing, the nutrients contained in every 100 grams of gourd are as follows: calories (15.00 kcal), protein (0.70 grams), fat (0.10 grams), carbohydrates (3.50 grams), dietary fiber (0.80 grams), vitamin A (7.00 micrograms ), carotene (40.00 micrograms), thiamine (0.02 mg), riboflavin (0.01 mg), niacin (0.40 mg), vitamin C (11.00 mg), calcium (16.00 mg), phosphorus (15.00 m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C05G1/00
Inventor 魏发展陈肖虎廖吉星高贵龙彭宝林薛涛周勇赵伟毅曾舒
Owner GUIZHOU KAILIN GRP CO LTD
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