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System and method for producing cyanamide and aragonite type nano calcium carbonate through lime nitrogen

A nano-calcium carbonate, cyanamide technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology for material and surface science, nanotechnology, etc. The effect of pollution

Inactive Publication Date: 2016-02-24
SHANGHAI FLUKO TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem in the prior art that the aqueous solution of cyanamide produced with lime nitrogen as a raw material produces difficult to handle waste residues, and to provide a system for producing cyanamide and aragonite-type nano-calcium carbonate with lime nitrogen

Method used

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  • System and method for producing cyanamide and aragonite type nano calcium carbonate through lime nitrogen
  • System and method for producing cyanamide and aragonite type nano calcium carbonate through lime nitrogen
  • System and method for producing cyanamide and aragonite type nano calcium carbonate through lime nitrogen

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Embodiment 1

[0025] Use the method for the continuous production of cyanamide and aragonite-type nano-calcium carbonate system to produce cyanamide and aragonite-type nano-calcium carbonate with lime nitrogen, comprising the steps:

[0026] 1) Use the above-mentioned system for producing cyanamide and aragonite type nano-calcium carbonate with lime nitrogen;

[0027] 2) The water of lime nitrogen and 20L / h of pulverized nitrogen content 20wt% is passed continuously in the hydrolysis tank 1 with 10kg / h, the mixture after the hydrolysis is filtered through the first filter 2, and the filter residue is discharged through the waste residue outlet; The filtrate, 65ml / h phosphoric acid (crystal form modifier) ​​and carbon dioxide gas are continuously transported to the high shear reactor 3, the reaction temperature is below 60°C, and the pH of the system reaches 9-10 by adjusting the flow rate of carbon dioxide;

[0028] 3) The product slurry discharged from the high-shear reactor is passed into...

Embodiment 2

[0030] Use the method for producing cyanamide and aragonite nano-calcium carbonate intermittently in the system of producing cyanamide and aragonite-type nano-calcium carbonate with lime nitrogen, comprising the steps:

[0031] 1) Use the above-mentioned system for producing cyanamide and aragonite type nano-calcium carbonate with lime nitrogen;

[0032] 2) Pass 15kg of pulverized lime nitrogen and 30L water into the hydrolysis tank, the mixture after the hydrolysis is filtered through the first filter, and the filter residue is discharged through the waste residue outlet; the filtrate and 0.1L phosphoric acid (crystal form control agent) into the high-shear reactor, carbon dioxide gas is continuously transported into the high-shear reactor, the reaction temperature is controlled below 60°C, and the system reaches pH=9 by controlling the amount of carbon dioxide gas introduced;

[0033] 3) The product slurry discharged from the high-shear reactor is passed through the second f...

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Abstract

The invention discloses a system and method for producing cyanamide and aragonite type nano calcium carbonate through lime nitrogen. The system comprises a reactor. The outlet of the reactor is sequentially connected with a second filter and a cyanamide solution storage tank through pipelines. The inlet of the reactor is sequentially connected with a first filter and a hydrolysis tank. A lime nitrogen inlet and a water inlet are formed in the hydrolysis tank. A waste residue outlet is formed in the first filter. A carbon dioxide gas inlet and a crystal form regulating agent inlet are formed in the reactor. An aragonite type nano calcium carbonate outlet is formed in the second filter. The second filter is connected with the hydrolysis tank through a pipeline. Aragonite type nano calcium carbonate can be obtained while cyanamide is produced through lime nitrogen, it is avoided that in the existing production process, solid containing calcium carbonate is used as waste residues to be discharged, pollution to the environment is reduced, production benefits are increased, and quality of produced aragonite type nano calcium carbonate is equivalent to quality of aragonite type nano calcium carbonate produced with calcium oxide as the raw material.

Description

technical field [0001] The invention relates to a system and a method for producing cyanamide and aragonite nanometer calcium carbonate by using lime nitrogen. Background technique [0002] As an industrial raw material, cyanamide is widely used in pesticide and pharmaceutical raw material industries, and is used as epoxy resin curing agent, dye fixing agent, flocculant, etc. Crystalline cyanamide is mainly used in the synthesis of medicines, health care products, feed additives and pesticide intermediates. The aqueous solution of cyanamide can be used as a defoliant and non-toxic insecticide for fruit trees. Cyanamide is also an intermediate product in the process of synthesizing dicyandiamide. Dicyandiamide, also known as dicyandiamide, abbreviated as DICY or DCD, has a chemical formula of C2H4N4. White crystalline powder, a dimer of cyanamide and a cyano derivative of guanidine, the solubility in water is 4.13g / 100g (298.15K). Dicyandiamide is usually used as a raw mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/16C01F11/18B82Y30/00
CPCC01C3/16B82Y30/00C01F11/182C01P2002/72C01P2004/03C01P2004/10
Inventor 张金利周鸣亮杨超李韡韩优付雁
Owner SHANGHAI FLUKO TECH DEV
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