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A method for jointly producing soda ash and compound nitrogen fertilizer using mirabilite and ammonium bicarbonate as raw materials

A technology of combined production of ammonium bicarbonate, applied in the field of chemical technology, can solve the problems of complex process, low primary utilization rate, high energy consumption, etc., and achieve the effect of simple process flow, high subsidiary value, and reduced energy consumption

Active Publication Date: 2021-06-04
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the Soviet Union has successively developed the soda ash production process by wet method and dry method, but these methods all have the disadvantages of high energy consumption, complicated process, and poor product quality.
Subsequently, the Soviet Union developed a circulating soda ash method. Compared with the above-mentioned method of making soda ash from mirabilite, this method has low energy consumption and low pollution, and Na 2 C0 3 Higher purity (>95%), but Na + Low primary utilization (64%-65%)
my country has also successively carried out a series of experimental studies on the production of alkali from Glauber's salt, but there are various problems such as many by-products, complex processes, high energy consumption, and low conversion rate of sodium sulfate, so it has not been industrialized

Method used

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  • A method for jointly producing soda ash and compound nitrogen fertilizer using mirabilite and ammonium bicarbonate as raw materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for jointly producing soda ash and compound nitrogen fertilizer using mirabilite and ammonium bicarbonate as raw materials, its technological process is as follows figure 1 As shown, the specific steps of the method are as follows:

[0025] (1) Sodium sulfate solution is sent into the premix tank, and solid ammonium bicarbonate is added thereto under stirring simultaneously, wherein, the mass ratio of water and ammonium bicarbonate is 1:1.0, and the mass ratio of sodium sulfate and ammonium bicarbonate is 1 :1.5;

[0026] (2) The residence time of the material in the premix tank is 2h, the temperature of the premix tank is 30°C, and the reaction equation is as follows:

[0027] 2NH 4 HCO 3 +Na 2 SO 4 ===2NaHCO 3 +(NH 4 ) 2 SO 4

[0028] (3) The mixed material after the pre-reaction is sent to the reaction crystallizer, the material reacts further, the sodium bicarbonate crystallization grows up, the reaction crystallizer temperature is 50 ℃, the press...

Embodiment 2

[0036] A method for jointly producing soda ash and compound nitrogen fertilizer with mirabilite and ammonium bicarbonate as raw materials, the technological process is as follows figure 1 As shown, the specific steps are as follows:

[0037] (1) Send the sodium sulfate solution into the premixing tank, and add solid ammonium bicarbonate to it under stirring at the same time, the mass ratio of water and ammonium bicarbonate is 1:1.5, and the mass ratio of sodium sulfate and ammonium bicarbonate is 1:1.3 ;

[0038] (2) The residence time of the material in the premix tank is 1h, the temperature of the premix tank is 28°C, and the reaction equation is as follows:

[0039] 2NH 4 HCO 3 +Na 2 SO 4 ===2NaHCO 3 +(NH 4 ) 2 SO 4

[0040] (3) The mixed material after the pre-reaction is sent to the reaction crystallizer, the material reacts further, the sodium bicarbonate crystallization grows up, the reaction crystallizer temperature is 40 ℃, the pressure is 0.3MPa, and the re...

Embodiment 3

[0049] A method for jointly producing soda ash and compound nitrogen fertilizer with mirabilite and ammonium bicarbonate as raw materials, the technological process of the method is as follows figure 1 As shown, the specific steps are as follows:

[0050] (1) Send the sodium sulfate solution into the premixing tank, and add solid ammonium bicarbonate to it under stirring at the same time, the mass ratio of water and ammonium bicarbonate is 1:1.2, and the mass ratio of sodium sulfate and ammonium bicarbonate is 1:1.3 ;

[0051] (2) The residence time of the material in the premix tank is 1.5h, the temperature of the premix tank is 35°C, and the reaction equation is as follows:

[0052] 2NH 4 HCO 3 +Na 2 SO 4 ===2NaHCO 3 +(NH 4 ) 2 SO 4

[0053] (3) The mixed material after the pre-reaction is sent to the reaction crystallizer, the material reacts further, the sodium bicarbonate crystallization grows up, the reaction crystallizer temperature is 45 ℃, the pressure is 0....

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Abstract

The invention belongs to the technical field of chemical technology, in particular to a method for jointly producing soda ash and compound nitrogen fertilizer by using Glauber's salt and ammonium bicarbonate as raw materials. In the method, sodium sulfate and ammonium bicarbonate are prepared into a suspension, and the mass ratio of ammonium bicarbonate, water and sodium sulfate is controlled, so that the mixed material is reacted under certain conditions, that is, sodium bicarbonate crystals are formed, and the mixed material is dehydrated , washing, the filter cake is the wet material of sodium bicarbonate, and the wet material is sent to the calcination section to obtain the soda ash product. The unreacted ammonium bicarbonate in the reaction mother liquor is decomposed with nitric acid, and then sent to the mother liquor evaporation section for vacuum evaporation and crystallization, and the ammonium sulfate and sodium sulfate in it are separated out step by step, and the remaining material is sent to the compound fertilizer device, and other elements are added according to the formula to produce compound nitrogen fertilizer . In the soda ash production method of the present invention, the conversion rate of sodium sulfate reaches more than 70%, and the mother liquor treatment process has a short technological process, simple operation, few equipment and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of chemical technology, and specifically relates to a method for jointly producing soda ash and compound nitrogen fertilizer by using mirabilite and ammonium bicarbonate as raw materials. Background technique [0002] my country's soda ash production capacity is nearly 30 million tons. The production methods include trona method, ammonia soda method and combined soda method. Among them, trona is limited by natural resources and is mainly distributed in a few regions such as Inner Mongolia and Henan. The production of soda ash by the ammonia-soda method produces a large amount of waste water and waste solids, and the pressure on environmental protection is high, so it can only be built in coastal and salt lake areas. And the by-product of Hou's soda making method using sodium chloride salt as raw material is ammonium chloride, and chloride ion is easy to cause hardening of upland field as nitrogen fertilizer,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D7/02C05G1/00
CPCC01D7/02C05G1/00
Inventor 唐印冯瑞郭利红雷林
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD