Preparation method and device for producing calcium nitrate liquor by nitrification gas

A technology of calcium nitrate and nitrate gas, applied in the direction of calcium/strontium/barium nitrate, etc., can solve the problems of endangering personal safety, low degree of automation, and polluting the environment, and achieve complete reaction, high utilization rate of NO, and safe reaction process Effect

Inactive Publication Date: 2014-05-21
ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to manual operation, this preparation method has a low degree of automation; in addition, dilute nitric acid is put into the reaction violently and exothermic completely, which o

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  • Preparation method and device for producing calcium nitrate liquor by nitrification gas

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Effect test

Embodiment 1

[0045] A kind of preparation method utilizing nitrification gas to produce calcium nitrate solution, comprises the steps:

[0046] (1) Feed nitrification gas and cooling water from the bottom and top of the reactor into the absorption tower to react to generate dilute nitric acid with a concentration of 5%, and supplement compressed air so that the content of nitrogen oxides in the exhaust tail gas is less than 200PPm; The pressure inside the vessel was 0.3 MPa, the temperature at the bottom was 30°C, and the temperature at the top was 10°C.

[0047] (2) Spray the dilute nitric acid generated in (1) evenly on the surface of quicklime at a temperature of 40°C to generate a calcium nitrate solution;

[0048] (3) After the calcium nitrate solution is filtered and cooled, it enters the reactor and repeats the steps (1) and (2) to further increase the concentration of the calcium nitrate solution until the nitrification gas reaction is completed;

[0049] (4) Pass the compressed a...

Embodiment 2

[0053] A kind of preparation method utilizing nitrification gas to produce calcium nitrate solution, comprises the steps:

[0054] (1) Feed nitrification gas and cooling water from the bottom and top of the reactor into the absorption tower to react to generate dilute nitric acid with a concentration of 10%, and supplement compressed air so that the content of nitrogen oxides in the exhaust tail gas is less than 200PPm; The pressure inside the vessel was 0.5 MPa, the temperature at the bottom was 35°C, and the temperature at the top was 20°C.

[0055] (2) Spray the dilute nitric acid generated in (1) evenly on the surface of quicklime at a temperature of 50°C to generate a calcium nitrate solution;

[0056] (3) After the calcium nitrate solution is filtered and cooled, it enters the reactor and repeats the steps (1) and (2) to further increase the concentration of the calcium nitrate solution until the nitrification gas reaction is completed;

[0057] (4) Pass the compressed ...

Embodiment 3

[0061] A kind of preparation method utilizing nitrification gas to produce calcium nitrate solution, comprises the steps:

[0062] (1) Feed nitrification gas and cooling water into the absorption tower from the bottom and top of the reactor to react to generate dilute nitric acid with a concentration of 15%, and supplement compressed air so that the content of nitrogen oxides in the exhaust tail gas is less than 200PPm; reaction The pressure inside the vessel was 0.8MPa, the temperature at the bottom was 45°C, and the temperature at the top was 30°C.

[0063] (2) Spray the dilute nitric acid generated in (1) evenly on the surface of quicklime at a temperature of 60°C to generate a calcium nitrate solution;

[0064] (3) After the calcium nitrate solution is filtered and cooled, it enters the reactor and repeats the steps (1) and (2) to further increase the concentration of the calcium nitrate solution until the nitrification gas reaction is completed;

[0065] (4) Pass the com...

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Abstract

The invention provides a preparation method and a device for producing calcium nitrate liquor by a nitrification gas. The preparation method comprises the following steps: carrying a reaction on the nitrification gas and cooling water to generate dilute nitric acid; carrying out a reaction on dilute nitric acid and quick lime to generate calcium nitrate liquor; after filtering and cooling the calcium nitrate liquor, repeating the previous two steps to improve the concentration of the calcium nitrate liquor till the nitrification gas reacts completely; stirring the calcium nitrate liquor and adjusting pH value of the calcium nitrate liquor; and settling and filtering to obtain the product calcium nitrate liquor. According to the invention, by fully utilizing the characteristic that the nitrification gas of a constant pressure pressurizing dilute nitric acid production device contains NOX gases, NOX gases and water are reacted to generate dilute nitric acid under a condition of oxygen enrichment, and the dilute nitric acid and quick lime (CaO) are in acid-base reaction to generate the calcium nitrate liquor. The reaction is mild without acid mist and acid mist which are harmful to personal safety and pollute the environment.

Description

technical field [0001] The invention relates to calcium nitrate preparation technology, in particular to a preparation method and device for producing calcium nitrate solution by using nitrating gas. [0002] Background technique [0003] Calcium nitrate solution is widely used, for example, 40-43% calcium nitrate solution is used as frozen brine in large-scale refrigeration units to transfer heat between refrigerant and frozen materials; calcium nitrate solution can be used as the main component of liquid calcium fertilizer to promote plant growth ; In addition, the concentration of calcium nitrate solution can form calcium nitrate crystals, which are widely used in industrial and agricultural production. [0004] At present, the most commonly used industrial preparation method of calcium nitrate solution is: first add 50% dilute nitric acid to the production tank of white steel, and add quicklime intermittently, and the solution in the tank is stirred by a stirrer or ...

Claims

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Application Information

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IPC IPC(8): C01F11/38
Inventor 孙虎
Owner ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH
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