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A kind of white carbon black precipitation reaction ammonia flow method
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A precipitation reaction and silica technology, applied in the chemical industry, can solve the problems of decreased yield, waste of liquid ammonia evaporation heat, blocked nozzles, etc., and achieve the effects of increasing production efficiency, reducing system energy consumption, and reducing energy consumption.
Active Publication Date: 2016-03-02
WENGFU (GRP) CO LTD +1
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Problems solved by technology
[0003] In the traditional method of precipitation and ammonia flow, the ammonia to be supplemented in the precipitation process is firstly introduced into liquid ammonia from the outside, and then the liquid ammonia is vaporized through the ammonia evaporator, and then the ammonia buffer tank stabilizes the gas ammonia pressure and then enters through the insertion tube. Precipitation reactor, simple process see figure 1 , this method not only causes waste of the evaporation heat of liquid ammonia, but the ammonia insertion tube also often causes SiO 2 plugged nozzle
The average impact time of parking and clearing is 5 hours / time, and the production rate will drop by 2%
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Embodiment 1
[0014] A method for passing ammonia through white carbon black precipitation reaction, comprising the following steps:
[0016] (2) After the dissolved and evaporated ammonia water mixture is condensed and absorbed, it continuously enters the precipitation reactor, and the mixed material is continuously circulated through the spray reaction tower, and the insufficient ammonia is directly passed into the spray reaction tower in the form of liquid ammonia as a supplement, 70% The load supplementary ammonia amount is controlled in the range of 100-200kg / h.
[0017] (3) After the precipitation reaction occurs through the spray reaction tower, the mixed material (ammonium fluoride + silicon dioxide) enters the precipitation tank in a self-flowing manner, and in this way, the temperature of the precipitation reactor is controlled at 30-50 ° C, ...
Embodiment 2
[0020] A method for passing ammonia through white carbon black precipitation reaction, comprising the following steps:
[0021] (1) Same as step (1) of Example 1
[0022] (2) The process is the same as step (2) of Example 1, and the amount of ammonia under 100% load control is in the range of 200-300kg / h.
[0023] (3) Same as step (3) of Example 1.
[0024] The test results are shown in Table 1.
Embodiment 3
[0026] A method for passing ammonia through white carbon black precipitation reaction, comprising the following steps:
[0027] (1) Same as step (1) of Example 1
[0028] (2) The process is the same as step (2) of Example 1, and the amount of ammonia under 120% load control is in the range of 300-400kg / h.
[0029] (3) Same as step (3) of Example 1.
[0030] The test results are shown in Table 1.
[0031]
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Abstract
The invention discloses a method for passing ammonia through white carbon blackprecipitation reaction. After being absorbed by condensation, it enters the precipitation reactor continuously, and the mixed material is continuously circulated through the spray reaction tower. After the precipitation reaction occurs in the showertower, the mixture of ammoniumfluoride and silicon dioxide enters the precipitation tank in a self-flowing manner, and the temperature of the precipitation tank is controlled at 30-50 °C, so that it circulates until the pH of the precipitation tank reaches 9.0-10 after the reaction is complete. , into the follow-up filtrationsystem. The invention can reduce energy consumption, and the insertion tube is not easy to be blocked.
Description
technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for passing ammonia through precipitation reaction of white carbon black. Background technique [0002] During the production process of phosphatefertilizer industry, a large amount of fluosilicic acid is produced as a by-product. When anhydroushydrogenfluoride is produced by using concentrated sulfuric acid as a raw material, a large amount of fluorine-containing siliconslag is produced by-product. The fluorine is separated from silicon dioxide in the form of ammoniumfluoride to obtain industrial ammonium fluoride, and the silicon dioxide is separated and dried to obtain industrial white carbon black. . The method mainly consists of batching, dissolving, precipitating, filtering, drying, concentrating, crystallizing and separating. [0003] In the traditional method of precipitation and ammonia flow, the ammonia to be supplemented in the pre...
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