Method for preparation of sodium bicarbonate and ammonium sulfate from chemical strong brine

A technology of baking soda and concentrated brine, which is applied in chemical instruments and methods, ammonia compounds, inorganic chemistry, etc., can solve the problems of difficult treatment of chemical concentrated brine, achieve effective utilization, simple production process, and reduce anti-corrosion requirements

Active Publication Date: 2017-06-20
科莱环保(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the problem that the chemical concentrated brine is difficult to handle in the existing technology, the present invention provides a method for producing baking soda and ammonium sulfate from the chemical concentrated brine, so as to realize the resourceful treatment of miscellaneous salts
In this method, sodium bicarbonate and ammonium sulfate products are obtained by reacting the refined Glauber's salt liquid obtained after dehardening the evaporated and concentrated chemical concentrated brine by the ammonia-alkali method. This method not only solves the problem that the chemical concentrated brine is difficult to handle, but also realizes Recycling of salt to meet the requirements of sustainable development

Method used

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  • Method for preparation of sodium bicarbonate and ammonium sulfate from chemical strong brine
  • Method for preparation of sodium bicarbonate and ammonium sulfate from chemical strong brine
  • Method for preparation of sodium bicarbonate and ammonium sulfate from chemical strong brine

Examples

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Effect test

Embodiment 1

[0044] 1) Pretreatment: Evaporating and concentrating chemical concentrated brine to obtain a 91% sodium sulfate solution by mass percentage, passing 150t of 91% sodium sulfate solution into a raw material tank for storage;

[0045]2) Remove calcium and magnesium ions: pass step 1) saturated sodium sulfate solution into the reaction tank, add 2t sodium hydroxide and 8t sodium carbonate to the reaction tank, eliminate calcium and magnesium ions in the solution and make refined Glauber's salt liquid;

[0046] 3) Coagulation and clarification: pass the solution for removing calcium and magnesium ions in step 2) into the coagulation and clarification tank and add polyaluminum chloride to stir, stir for 13 minutes and then let stand for 30 minutes to clarify to obtain the supernatant;

[0047] 4) Preparation of ammonium bicarbonate: passing the supernatant in step 3) into a refined Glauber's salt tank, passing ammonia and carbon dioxide gas into the refined Glauber's salt tank to re...

Embodiment 2

[0058] On the basis of Example 1, this example modifies the conditions of some steps in Example 1, and the remaining parts are completely the same as Example 1.

[0059] 5) carbonization reaction: pass the solution after the fully mixed reaction in step 4) into the carbonization tower for carbonization reaction, continuously add carbon dioxide gas during the reaction, the pressure of the carbonization tower is 0.4MPa, and feed CO 2 75% by volume, CO 2 The temperature of entering the tower is 45°C, and the carbonization time takes 4 hours. The sodium bicarbonate crystals generated by the reaction are precipitated from the bottom of the tower and passed into the salt slurry tank;

[0060] 8) Ammonia and carbon dioxide recovery: store the supernatant obtained in step 6) and the mother liquor obtained in step 7) in a centrifuge bucket, add sulfuric acid to adjust the pH to 4, and recover ammonia and carbon dioxide;

[0061] The purity of the sodium bicarbonate prepared by the abo...

Embodiment 3

[0063] On the basis of Example 1, this example modifies the conditions of some steps in Example 1, and the remaining parts are completely the same as Example 1.

[0064] 5) carbonization reaction: pass the solution after the fully mixed reaction in step 4) into the carbonization tower for carbonization reaction, continuously add carbon dioxide gas during the reaction process, the pressure of the carbonization tower is 0.35MPa, and feed CO 2 Volume content is 65%, CO 2 The temperature of entering the tower is 40°C, and the carbonization time takes 3 hours. The sodium bicarbonate crystals generated by the reaction are precipitated from the bottom of the tower and passed into the salt slurry tank;

[0065] 8) Ammonia and carbon dioxide recovery: store the supernatant obtained in step 6) and the mother liquor obtained in step 7) in a centrifuge bucket, add sulfuric acid to adjust the pH to 2.5, and recover ammonia and carbon dioxide;

[0066] The purity of the sodium bicarbonate ...

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Abstract

Belonging to the technical field of solid waste miscellaneous salt recycling treatment, the invention discloses a method for preparation of sodium bicarbonate and ammonium sulfate from chemical strong brine. According to the method, evaporated and concentrated chemical strong brine is subjected to hardness removal to obtain a delicate mirabilite solution, and then ammonia-soda process reaction is carried out to obtain sodium bicarbonate and ammonium sulfate products. The method provided by the invention solves the difficult treatment problem of chemical strong brine, realizes recycling of miscellaneous salt in strong brine, and meets the sustainable development requirements. At the same time, compared with the salt method for preparation of sodium bicarbonate, the method provided by the invention reduces the anti-corrosion requirement of equipment, saves the project investment for preparation of sodium bicarbonate, has the byproduct ammonium sulfate with a value higher than ammonium chloride, and has obvious advantages in economic benefits.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and in particular relates to a method for producing sodium bicarbonate and ammonium sulfate products by using hazardous waste residue salt sodium sulfate as a raw material through an ammonia-soda method. Background technique [0002] In recent years, my country's coal chemical industry has developed rapidly, and coal chemical industry has played a very important and positive role in the implementation of the petroleum substitution strategy and the structural adjustment of the chemical industry in my country. [0003] The coal chemical industry usually has a large amount of saline wastewater and is difficult to deal with. The wastewater discharge problem of the coal chemical industry has become the focus of environmental protection. Enterprises usually pretreat saline wastewater and then use evaporation and crystallization process to reduce the accumulation of saline wastewater. Crystall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/242C01C1/244C01D7/00
CPCC01C1/242C01C1/244C01D7/00C01P2006/80
Inventor 董文波郝耿健
Owner 科莱环保(北京)有限公司
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