Method for preparing lime nitrogen through hydrogen cyanamide production waste residues

A technology of cyanamide and lime nitrogen, which is applied in the field of preparing lime nitrogen from cyanamide production waste residue, can solve the problems of polluting the environment and no effective utilization of waste residue, and achieves the effect of solving environmental protection problems and realizing recycling

Inactive Publication Date: 2018-11-23
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no effective utilization method for the waste residue, which slowly releases ammonia gas during storage, seriousl...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing lime nitrogen from cyanamide production waste slag is characterized in that the cyanamide production waste slag is dried and ground, mixed with an auxiliary agent, and calcined with ammonia gas in an ammonia gas atmosphere to obtain lime nitrogen.

[0028] Its specific steps include:

[0029] (1) Drying: drying the cyanamide production waste residue at 50° C. for 12 hours.

[0030] (2) Grinding: Grinding the dried solid particles in (1) into powder with a particle size of 200-500 mesh.

[0031] (3) Mixing: fully mix the ground powder in (2) with 5% calcium chloride by powder mass.

[0032] (4) Calcination: The mixture in (3) was calcined at a high temperature of 500° C. for 72 hours in an ammonia atmosphere.

[0033] The obtained product has an effective nitrogen content of 18.8%.

Embodiment 2

[0035] A method for preparing lime nitrogen from cyanamide production waste slag is characterized in that the cyanamide production waste slag is dried and ground, mixed with an auxiliary agent, and calcined with ammonia gas in an ammonia gas atmosphere to obtain lime nitrogen.

[0036] Its specific steps include:

[0037] (1) Drying: drying the cyanamide production waste residue at 100° C. for 8 hours.

[0038] (2) Grinding: Grinding the dried solid particles in (1) into powder with a particle size of 1000-2000 mesh.

[0039] (3) Mixing: fully mix the ground powder in (2) with 1% lithium carbonate by powder mass.

[0040] (4) Calcination: The mixture in (3) was calcined at a high temperature of 600° C. for 48 hours in an ammonia atmosphere.

[0041] The obtained product has an effective nitrogen content of 22.1%.

Embodiment 3

[0043] A method for preparing lime nitrogen from cyanamide production waste slag is characterized in that the cyanamide production waste slag is dried and ground, mixed with an auxiliary agent, and calcined with ammonia gas in an ammonia gas atmosphere to obtain lime nitrogen.

[0044] Its specific steps include:

[0045] (1) Drying: drying the cyanamide production waste residue at 200° C. for 4 hours.

[0046] (2) Grinding: Grinding the dried solid particles in (1) into powder with a particle size of 1000-2000 mesh.

[0047] (3) Mixing: fully mix the ground powder in (2) with 0.1% potassium fluoride by powder mass.

[0048] (4) Calcination: The mixture in (3) was calcined at 400° C. for 96 hours in an ammonia atmosphere.

[0049] The obtained product has an effective nitrogen content of 15.1%.

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Abstract

The invention belongs to the field of chemical production. A method for preparing lime nitrogen through hydrogen cyanamide production waste residues comprises the steps of adopting the hydrogen cyanamide production waste residues as raw materials, drying, grinding, mixing with an accessory ingredient, and calcining with an ammonia gas under the atmosphere of the ammonia gas so as to obtain the lime nitrogen. By adopting the method provided by the invention, hydrogen cyanamide residues can be value-based developed and are recycled, so that an economic and effective way is provided for recyclingthe hydrogen cyanamide residues and preparing the lime nitrogen. The lime nitrogen can be continuously used for hydrogen cyanamide production, the recycling of the hydrogen cyanamide production wasteresidues is realized, and the environmental matter brought by the solid waste residues is solved.

Description

technical field [0001] The invention belongs to the field of chemical production, and relates to a method for preparing lime nitrogen from cyanamide production waste residue. Background technique [0002] As a fine chemical product, cyanamide is an important raw material for chemical products, pharmaceutical intermediates, and pesticides. Cyanamide solution is widely used at home and abroad as a defoliant for fruit trees, a non-toxic insecticide, and a chemical fertilizer. Cyanamide solid is used in the synthesis of medicine, health products, feed additives and pesticide intermediates. [0003] Domestic industrial production of cyanamide generally adopts the process of reacting lime nitrogen with carbon dioxide in aqueous solution: [0004] CaCN 2 +H 2 O+CO 2 =H 2 CN 2 +CaCO 3 [0005] This production process can produce a large amount of waste residues when obtaining cyanamide product, and the main component of waste residues is calcium carbonate (60%-90%), moistur...

Claims

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Application Information

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IPC IPC(8): C01C3/18C05C7/00
CPCC01C3/18C05C7/00
Inventor 马韵升张超梁万根刘军张宁
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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