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Method for preparing calcium cyanamide through plasma-assisted ball milling

A technology of plasma and calcium cyanamide, which is applied in the field of plasma-assisted ball milling to prepare calcium cyanamide, can solve the problems of exhaust gas pollution, high cost of raw materials, and unusable solid waste, and achieve the goal of shortening the reaction time and promoting the preparation process Effect

Inactive Publication Date: 2019-09-06
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation method of calcium cyanamide used in the industry is to use calcium carbide and nitrogen to react at high temperature (1000 ° C). Generate a large amount of solid waste that cannot be utilized
It has been reported in the literature that the reaction of urea and calcium oxide is used to prepare calcium cyanamide. Because the excessive urea cannot be recovered, the cost of raw materials is high, and a certain amount of waste gas pollution is generated.

Method used

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  • Method for preparing calcium cyanamide through plasma-assisted ball milling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 1200g of stainless steel grinding balls and 20g of industrial calcium carbonate with a particle size of 40-100 microns, put them into the ball mill tank, connect the ball mill tank with the gas circuit device, and then vacuumize the ball mill tank and install it on the discharge ball mill. Absorb with water. Feed ammonia gas into the ball mill tank with a flow rate of 0.5L / min, turn on the ball mill and discharge power supply for plasma-assisted ball milling, the discharge current is 1.5A, the ball milling speed is 1000rpm, and the calcium cyanamide product is obtained after ball milling for 6.5 hours 14g, the detected effective nitrogen content is 24.8%.

Embodiment 2

[0024] Weigh 800g of zirconia grinding balls and 20g of industrial calcium carbonate with a particle size of 10-40 microns, put them into a ball mill jar, connect the ball mill jar to the gas circuit device, then vacuumize the ball mill jar and install it on the discharge ball mill. The exhaust gas is absorbed with water. Feed ammonia in the ball mill tank, flow rate is 0.1L / min, open ball mill and discharge power supply and carry out plasma-assisted ball mill, discharge current is 1A, ball mill rotating speed is 800rpm, after ball milling 8 hours, 16g of calcium cyanamide product is obtained, The detected effective nitrogen content is 22.5%.

Embodiment 3

[0026] Weigh 1600g of silicon carbide grinding balls and 20g of industrial calcium carbonate with a particle size of 150-200 microns, put them into a ball mill jar, connect the ball mill jar to the gas circuit device, then vacuumize the ball mill jar and install it on the discharge ball mill. The exhaust gas is absorbed with water. Feed ammonia gas into the ball mill tank, the flow rate is 1L / min, turn on the ball mill and discharge power supply to carry out plasma-assisted ball milling, the discharge current is 2A, the ball milling speed is 1200rpm, after ball milling for 5 hours, 13g of calcium cyanamide product is obtained, and the test The available nitrogen content is 23.1%.

[0027] Carry out XRD analysis result to the calcium cyanamide product in embodiment 1 as figure 1 shown. Among them, the test condition is Cu target, the radiation is Kβ, the test voltage is 40kV, the test current is 150mA, the scanning angle is 5°-75°, and the scanning speed is 4° / min.

[0028] ...

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Abstract

The invention belongs to the technical field of fine chemical engineering, and relates to a method for preparing calcium cyanamide through plasma-assisted ball milling. After calcium carbonate powderis subjected to discharge plasma-assisted ball milling in ammonia gas, the calcium carbonate powder can occurs gas-solid reaction with the ammonia gas in a short time to prepare the calcium cyanamide.The activation of the ammonia gas by discharge plasma and the activation of the surface of the calcium carbonate powder are organically combined with the mechanical effect of high-energy ball millingat the same time, so that the preparation process of the calcium cyanamide is effectively promoted, and the reaction time is shortened.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and relates to a method for preparing calcium cyanamide by plasma-assisted ball milling. Background technique [0002] Calcium cyanamide is a very important chemical raw material, it is the raw material of cyanamide, dicyandiamide, thiourea, melamine, guanidine and substituted triazine. It is also an important nitrogen fertilizer and is generally used as a base fertilizer. In the iron and steel industry, it is directly used as a nitriding agent for carbon steel and low alloy and a desulfurizer for pig iron. In terms of three wastes treatment, it can be used to remove formaldehyde in wastewater. It can also be used as an etchant to reduce the corrosion of steel by salt water. Another important use is to make pesticides, such as molluscicides. [0003] The preparation method of calcium cyanamide used in the industry at present is to use calcium carbide and nitrogen to react at high temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C19/18B02C17/10
CPCB02C17/10B02C19/18B02C2019/183
Inventor 程珍常忠臣马韵升张建林栾波
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD