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Method for producing sodium nitrate

A technology of sodium nitrate and sodium sulfate, applied in the direction of alkali metal nitrate purification, etc., can solve the problems of large electric power consumption, high steam consumption, low temperature of cold precipitation mother liquor, etc., to achieve high product quality, high raw material utilization, energy low consumption effect

Inactive Publication Date: 2007-11-14
CHINA LIGHT IND INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method can be divided into two types, one is mother liquor hot-dissolving sodium saltpeter-cold crystallization sodium nitrate method, and the other is evaporation and separation of salt salt-mother liquor cold crystallization sodium nitrate method, wherein mother liquor hot-dissolving sodium saltpeter-cold crystallization The crystallized sodium nitrate method has the problem that the concentration of hot-soluble sodium nitrate in the mother liquor is too low, and the temperature of the cold analysis mother liquor is also too low. In this way, a large amount of steam needs to be added for heating up, which makes the power consumption too large; while evaporation and separation of salt nitrate— —The mother liquor cold crystallization sodium nitrate method also has the problem of high steam consumption, and the salt and nitrate mixed salt produced by it also pollutes the environment
Therefore, the above two methods are not suitable for NaNO 3 -NaCl-Na 2 SO 4 -H 2 The brine of O system is used as raw material to produce sodium nitrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the product of this embodiment of the present invention adopts following raw material and steps to make:

[0019] (1) Take NaNO 3 Concentration is 600g / l, NaCl concentration is 120g / l, Na 2 SO 4 NaNO at a concentration of 30.0 g / l 3 -NaCl-Na 2 SO 4 -H 2 O system brine solution 12.60m 3 As raw material with NaNO 3 Concentration is 765g / l, NaCl concentration is 117g / l, Na 2 SO 4 Concentration is 15.1g / l sodium nitrate evaporation mother liquor 26.49m 3 After mixing and preheating, carry out conventional evaporation treatment to obtain a mixture of slurry sodium nitrate, sodium chloride and sodium sulfate, and the evaporation temperature is 80°C;

[0020] (2), carry out conventional solid-liquid separation to the mixture of sodium nitrate gained in step (1) and sodium chloride and sodium sulfate to obtain 1.89 tons of sodium sulfate sodium chloride mixed salt and 29.31m of salt making evaporation mother liquor 3 , the components of the obtained sal...

Embodiment 2

[0031] Embodiment 2: the product of this embodiment of the present invention adopts following raw material and steps to make:

[0032] (1) Take NaNO 3 NaNO with a concentration of 600g / l and a NaCl concentration of 120g / l 3 -NaCl-H 2 O system brine solution 12.60m 3 As raw material with NaNO 3 Sodium nitrate with a concentration of 765g / l and a NaCl concentration of 117g / l evaporated mother liquor 26.49m 3 After mixing and preheating, carry out conventional evaporation treatment to obtain a mixture of slurry sodium nitrate and sodium chloride, and the evaporation temperature is 90°C;

[0033] (2), carry out conventional solid-liquid separation to the mixture of sodium nitrate and sodium chloride gained in step (1) to obtain 1.89 tons of sodium chloride salt and 29.31 m of salt-making evaporation mother liquor 3 , the components of the obtained salt making evaporation mother liquor are:

[0034] NaNO 3 927g / l,

[0035] NaCl 82.6 g / l.

[0036] (3), to step (2) gaine...

Embodiment 3

[0041] Embodiment 3: the product of this embodiment of the present invention adopts following raw material and steps to make:

[0042] (1) Take NaNO 3 The concentration is 600g / l, Na 2 SO 4 NaNO at a concentration of 30.0 g / l 3 -Na 2 SO 4 -H 2 O system brine solution 12.60m 3 As raw material with NaNO 3 The concentration is 765g / l, Na 2 SO 4 Concentration is 15.1g / l sodium nitrate evaporation mother liquor 26.49m 3After mixing and preheating, carry out conventional evaporation treatment to obtain a mixture of slurry sodium nitrate and sodium sulfate, and the evaporation temperature is 100°C;

[0043] (2), carry out conventional solid-liquid separation to the mixture of sodium nitrate and sodium sulfate gained in step (1) to obtain 1.89 tons of sodium sulfate salt and 29.31m of salt-making evaporation mother liquor 3 , the components of the obtained salt making evaporation mother liquor are:

[0044] NaNO 3 927g / l,

[0045] Na 2 SO 4 13.3g / l.

[0046] ...

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Abstract

The invention offers a kind of method of producing sodium nitrate which belongs to technique field of inorganic chemical industry. This method uses the following raw material and steps to make sodium nitrate: 1. vaporize and dispose bittern solution and sodium nitrate vaporization mother liquor with certain volumetric ratio to get sodium nitrate mixture in the form of plasm; 2.separate solid and liquid, get salt-mixture of sodium sulfate and sodium chloride or sodium sulfate or sodium chloride and vaporization mother liquor to make salt; 3. vaporize and dispose vaporization mother liquor to make salt and get vaporization mother liquor to make salt in the form of plasm; 4. Separate solid and liquid, get vaporization mother liquor which continues to circulate and join in working procedure of salt preparation at high temperature using evaporation in step 1 and finished product of sodium nitrate. Utilizing ratio of raw material in this invention is high, quality of products is also high, with low energy consumption and production cost and it has no discharge of the three wastes.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a method for producing sodium nitrate by using brine as a raw material. Background technique [0002] Known methods of producing sodium nitrate, generally referred to as NaNO 3 (Sodium Nitrate)-NaCl(Sodium Chloride)-Na 2 SO 4 (sodium sulfate)-H 2 O (water) system brine is the method for raw material production sodium nitrate. The method can be divided into two types, one is the method of hot-dissolving sodium saltpeter in mother liquor-cold crystallization of sodium nitrate, and the other is the method of evaporating and separating salt salt-cold crystallization of mother liquor in sodium nitrate, in which the mother liquor is hot-dissolving sodium saltpeter-cold crystallization The crystallized sodium nitrate method has the problem that the concentration of hot-soluble sodium nitrate in the mother liquor is too low, and the temperature of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/16
Inventor 彭赛军
Owner CHINA LIGHT IND INT ENG CO LTD
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