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Method for eliminating influence of iron ions on color of calcium ammonium nitrate product

A technology of calcium ammonium nitrate and iron ions, which is applied in the directions of ammonium nitrate fertilizer, ammonium nitrate, nitrate fertilizer, etc., can solve the problems of affecting the appearance quality of products, the color of calcium ammonium nitrate products is yellow and dark, and the cost can be increased. Less and less investment

Inactive Publication Date: 2017-12-15
成都云图控股股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the selected raw materials for the production of calcium ammonium nitrate contain impurities such as iron ions, which cannot be removed by adjusting the pH value during the reaction process, the c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] [1] After fully mixing 1kg of aminotrimethylene phosphonic acid and 1.1 tons of 35wt% nitric acid, they are added to a reaction kettle equipped with 1 ton of bluestone to react with bluestone;

[0025] [2] The reaction solution obtained in step [1] is adjusted to pH 5-6 with unslaked lime and press-filtered to obtain press-filtered solution;

[0026] [3] the pressed filtrate that step [2] obtains is carried out with ammonium nitrate solution by calcium ion and ammonium ion molar ratio 5:1 and ammonium, obtains ammonium nitrate calcium solution;

[0027] [4] Concentrate and granulate the calcium ammonium nitrate solution obtained in step [3] to obtain a white calcium ammonium nitrate product.

Embodiment 2

[0029] [1] After fully mixing 0.5kg of hydroxyethylidene diphosphonic acid and 0.6 ton of 40wt% nitric acid, they are added to react with bluestone in a reactor equipped with 0.5 ton of bluestone;

[0030] [2] The reaction solution obtained in step [1] is adjusted to pH 5-6 with unslaked lime and press-filtered to obtain press-filtered solution;

[0031] [3] the pressed filtrate that step [2] obtains is carried out with ammonium nitrate solution by calcium ion and ammonium ion molar ratio 5.2:1 and ammonium, obtains ammonium nitrate calcium solution;

[0032] [4] Concentrate and granulate the calcium ammonium nitrate solution obtained in step [3] to obtain a white calcium ammonium nitrate product.

Embodiment 3

[0034] [1] After fully mixing 1.44kg of hydroxyethylidene diphosphonic acid and 0.7 ton of 50wt% nitric acid, they were added to react with bluestone in a reactor containing 0.6 ton of bluestone;

[0035] [2] The reaction solution obtained in step [1] is adjusted to pH 5-6 with unslaked lime and press-filtered to obtain press-filtered solution;

[0036] [3] the pressed filtrate that step [2] obtains is carried out with ammonium nitrate solution by calcium ion and ammonium ion molar ratio 4.8:1 and ammonium, obtains ammonium nitrate calcium solution;

[0037] [4] Concentrate and granulate the calcium ammonium nitrate solution obtained in step [3] to obtain a white calcium ammonium nitrate product.

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Abstract

The invention belongs to the field of calcium ammonium nitrate production, and particularly relates to a method for eliminating the influence of iron ions on the color of calcium ammonium nitrate product. In a conventional calcium ammonium nitrate production process, the chosen material contains impurities, such as iron ions, which cannot be removed by regulating pH value in the process of reaction, causing the color of calcium ammonium nitrate product to become yellow and dark, and as a result, the appearance quality of the product is severely affected. At present, related reports and methods for solving the problem do not exist yet. The invention improves the conventional process, adding chelating agent with high chelating capability on impurities (such as iron ions) in the process of reaction, so that all the iron ions in solution are formed into chelated ions with high solubility, and ultimately, in the process of concentration and granulation, the impurity ions cannot be precipitated out along with the calcium ammonium nitrate product. When in use, the process can obtain purely white calcium ammonium nitrate product. The method is applicable to the industrial production of calcium ammonium nitrate.

Description

technical field [0001] The invention belongs to the field of calcium ammonium nitrate production, and in particular relates to a method for eliminating the influence of iron ions on the color of calcium ammonium nitrate products. Background technique [0002] Calcium ammonium nitrate is mostly used in the agricultural field, and its molecular formula is 5Ca(NO 3 ) 2 ·NH 4 NO 3 10H 2 O. The total nitrogen content is 15.5%, of which about 14% is nitrate nitrogen, and the rest is ammonium nitrogen, which is an important nitrogen fertilizer in agricultural production. Calcium ammonium nitrate is white round particles, 100% soluble in water, it is a new high-efficiency compound fertilizer containing nitrogen and quick-acting calcium. Ammonium is more comprehensive and can be directly absorbed by plants; this product is a neutral fertilizer with low physiological acidity, which can improve acidic soil. After being applied to the soil, the pH value is low, which will not cau...

Claims

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Application Information

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IPC IPC(8): C05C13/00C01C1/18C01F11/38
CPCC01C1/18C01F11/38C01P2006/80C05C1/00C05C5/04
Inventor 柏万文阎应广赖德燕康健陈小飞
Owner 成都云图控股股份有限公司
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