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Preparation method of high-quality lime nitrogen

A lime-nitrogen, high-quality technology, applied in the direction of cyanamide, can solve the problems of lime-nitrogen products with dark color, low content of active ingredients, and many side reactions, so as to achieve high product quality, ensure effective content, and reduce reaction temperature. Effect

Inactive Publication Date: 2018-12-14
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this production process: ① high energy consumption
②Consumption of a large amount of carbon resources such as coke or semi-coke
③The production process produces more by-products (such as cyanide, carbon black, etc.), resulting in a dark color of lime nitrogen products, low content of active ingredients, and many side reactions in downstream applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing high-quality lime nitrogen. The lime nitrogen is prepared by calcining calcium oxide and urea as raw materials, and ammonia-containing gas is introduced during the calcining process.

[0024] The specific steps are:

[0025] Mix calcium oxide and urea evenly, place in a high-temperature reaction furnace, continuously feed ammonia-containing gas to keep the system pressure at 0.1MPa, and carry out the first stage of calcination reaction at 180°C, and raise the system temperature to 650°C after 3 hours to continue the calcination reaction 5h, after the reaction is completed, cool to room temperature under nitrogen atmosphere, and grind the obtained product to the specified particle size, which is a high-quality lime nitrogen product. The product is white or off-white solid powder, and the active ingredient calcium cyanamide content is 90%.

[0026] In terms of molar ratio of pure substances, calcium oxide: urea = 1:2;

[0027] The calcium oxide re...

Embodiment 2

[0030] A method for preparing high-quality lime nitrogen. The lime nitrogen is prepared by calcining calcium oxide and urea as raw materials, and ammonia-containing gas is introduced during the calcining process.

[0031] The specific steps are:

[0032] Mix calcium oxide and urea evenly, place in a high-temperature reaction furnace, continuously feed ammonia-containing gas to keep the system pressure at 3MPa, carry out the first calcination reaction at 150°C, and raise the system temperature to 500°C after 4h to continue the calcination reaction for 9h , After the reaction is completed, cool to room temperature under nitrogen atmosphere, and grind the obtained product to the specified particle size, which is a high-quality lime nitrogen product. The product is white or off-white solid powder, and the active ingredient calcium cyanamide content is 84%.

[0033] In terms of molar ratio of pure substance, calcium oxide: urea = 1:8;

[0034] The calcium oxide refers to calcined...

Embodiment 3

[0037] A method for preparing high-quality lime nitrogen. The lime nitrogen is prepared by calcining calcium oxide and urea as raw materials, and ammonia-containing gas is introduced during the calcining process.

[0038] The specific steps are:

[0039] Mix calcium oxide and urea evenly, place in a high-temperature reaction furnace, continuously feed ammonia-containing gas to keep the system pressure at 1.5MPa, and carry out the first stage of calcination reaction at 300°C, and raise the system temperature to 700°C after 2.5h to continue calcination React for 3 hours. After the reaction, cool to room temperature under a nitrogen atmosphere, and grind the obtained product to a specified particle size, which is a high-quality lime nitrogen product. The product is white or off-white solid powder, and the active ingredient calcium cyanamide content is 80%.

[0040] In terms of molar ratio of pure substance, calcium oxide: urea = 1:5;

[0041] The calcium oxide is prepared by ca...

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Abstract

The invention belongs to the field of chemical and particularly relates to a preparation method of high-quality lime nitrogen. Lime nitrogen is prepared from calcium oxide and urea as raw materials bycalcination, and ammonia-containing gas is introduced in the calcination process. By introducing the ammonia-containing gas in the calcination process, urea decomposition is reduced effectively, reaction temperature is reduced, yield is increased, inclusion of by products in a final product is avoided, effective content of the effective component calcium cyanamide in the product is ensured, energy consumption is lower, production cost is low, and finally, obtained lime nitrogen has high quality, broad market space and huge economic benefit.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of high-quality lime nitrogen. Background technique [0002] Lime nitrogen, also known as calcium cyanamide, is a raw material for the production of cyanamide, dicyandiamide, thiourea, and carbendazim. It can be used as a metal heat treatment agent in iron and steel operations, and can be used as a base fertilizer in agriculture. At present, the consumption of lime nitrogen used in the production of cyanamide and dicyandiamide in my country accounts for 60% of the total consumption of lime nitrogen, and the consumption of thiourea and carbendazim accounts for about 35% of the total consumption of lime nitrogen. The consumption in the agricultural field only accounts for about 5% of the total consumption of lime nitrogen. [0003] In recent years, with the rising raw material prices of lime nitrogen production and the increase of other expenses, th...

Claims

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Application Information

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IPC IPC(8): C01C3/18
CPCC01C3/18
Inventor 张超梁万根于龙张宁崔卫华高鹏
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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