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Method for preparing super fine calcium carbonate and ammonia water from waste obtained in process for producing sodium cyanate by urea method

A technology of ultra-fine calcium carbonate and sodium cyanate, which is applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, ammonia compounds, etc., can solve the problems of cumbersome operation, low economic value, and extremely high equipment requirements, and reduce environmental pollution. Pollution, the effect of increasing economic benefits

Active Publication Date: 2012-09-05
南通华山实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Obviously, the industrial by-products produced by the urea method to produce sodium cyanate can also be rationally utilized through the process disclosed in patent 200610069084. , the resulting economic value is also very low

Method used

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  • Method for preparing super fine calcium carbonate and ammonia water from waste obtained in process for producing sodium cyanate by urea method
  • Method for preparing super fine calcium carbonate and ammonia water from waste obtained in process for producing sodium cyanate by urea method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: a kind of method that produces sodium cyanate gained waste with urea method to prepare superfine calcium carbonate and ammoniacal liquor, comprises the steps:

[0025] A: 300kg of quicklime is modulated into an emulsion and sent to the carbonization tower (1), and the surface treatment is carried out with a mass concentration of 5% surfactant agricultural emulsion. The stirring rate is 320r / min, and then, according to quicklime, ammonia and carbon dioxide The mass ratio is 1: 0.26: 0.39 and ammonia and carbon dioxide are dropped into the carbonization tower (1) for carbonization reaction;

[0026] B: the reaction product obtained in step A is filtered through a suction filter pump (2) to obtain a white filter cake and a clarified filtrate;

[0027] C: the white filter cake is washed by a washing machine (3), dried by a dryer (4), pulverized by a pulverizer (5), and packaged to obtain an ultrafine calcium carbonate product (7);

[0028] D: The clarified fi...

Embodiment 2

[0029] Embodiment 2: a kind of method that produces sodium cyanate gained waste with urea method to prepare superfine calcium carbonate and ammoniacal liquor, comprises the steps:

[0030] A: 500kg of unslaked lime is modulated into emulsion and is delivered to carbonization tower (1) in, is that 4% surfactant is carried out surface treatment with mass concentration, and described tensio-active agent is that mass concentration is the agricultural emulsion of 2% and mass concentration Be the mixture of 2% Tween-80, the stirring rate is 280r / min, then, according to the mass ratio of unslaked lime, ammonia gas and carbon dioxide is 1: 0.46: 0.59, ammonia gas and carbon dioxide gas are put into the carbonization tower (1) and carry out carbonization reaction ;

[0031] B: the reaction product obtained in step A is filtered through a suction filter pump (2) to obtain a white filter cake and a clarified filtrate;

[0032] C: the white filter cake is washed by a washing machine (3),...

Embodiment 3

[0034] Embodiment 3: a kind of method that produces sodium cyanate gained waste with urea method prepares superfine calcium carbonate and ammoniacal liquor, comprises the steps:

[0035] A: 400kg of quicklime is prepared into an emulsion and sent to the carbonization tower (1), with a mass concentration of 5% surfactant Tween-80 for surface treatment, stirring speed 120r / min, according to quicklime, ammonia and carbon dioxide The mass ratio is 1: 0.66: 0.79 and ammonia and carbon dioxide are dropped into the carbonization tower (1) for carbonization reaction;

[0036] B: the reaction product obtained in step A is filtered through a suction filter pump (2) to obtain a white filter cake and a clarified filtrate;

[0037] C: the white filter cake is washed by a washing machine (3), dried by a dryer (4), pulverized by a pulverizer (5), and packaged to obtain an ultrafine calcium carbonate product (7);

[0038] D: The clarified filtrate is sent to the vacuum distiller (6) for low-...

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Abstract

The invention provides a method for preparing super fine calcium carbonate and ammonia water from waste obtained in a process for producing sodium cyanate by a urea method. In the method, calcium hydroxide, and a mixture of ammonia, carbon dioxide and water obtained in the process for producing the sodium cyanate by the urea method react so as to prepare the super fine calcium carbonate and the cogenerated ammonia water, so that industrial byproducts are timely utilized and transformed, the environmental pollution is reduced, and the economic benefits of enterprises are increased.

Description

technical field [0001] The invention relates to the field of treatment and utilization of industrial waste gas, in particular to a method for preparing superfine calcium carbonate and ammonia water from the waste obtained by producing sodium cyanate by a urea method. Background technique [0002] Sodium cyanate (sodium cyanate, or cyanic acid sodium salt), sodium cyanate can be used as a quenching agent in steel processing. In the production of herbicides, fungicides, and insecticides, it is used to replace phosgene to synthesize various types of isocyanates to produce carbamates or replace urea pesticides. As a pharmaceutical intermediate, it can produce drugs for Parkinson's disease, diabetes, epilepsy and other diseases. Sodium cyanate is also used as a dye intermediate and as a catalyst in the production of acrylic polymers to maintain the whiteness of the fibers. Sodium cyanate can also be used as a photoinitiator. [0003] The synthetic method of sodium cyanate is w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18C01C1/00
Inventor 王嘉兴
Owner 南通华山实业有限公司
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