PTA incineration boiler ash residue solution salt separation crystallization process

A boiler ash and solution technology, applied in alkali metal carbonate, alkali metal carbonate shape preparation, alkali metal bromide, etc., can solve unfavorable production, high economic cost, huge consumption of hydrobromic acid, etc. question

Active Publication Date: 2021-05-18
河北工大晟珂工程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And when the content of sodium carbonate is higher, it needs to consume a huge amount of hydrobromic acid to convert it into sodium bromide by displacement method, and the economic cost is higher, which is not conducive to large-scale production.
However, there is no prior art that can thoroughly separate sodium carbonate and sodium bromide mixed salts

Method used

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  • PTA incineration boiler ash residue solution salt separation crystallization process
  • PTA incineration boiler ash residue solution salt separation crystallization process
  • PTA incineration boiler ash residue solution salt separation crystallization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A PTA incineration boiler ash solution salt separation crystallization process, the quality of the PTA incineration boiler ash is 1360Kg / h, the weight percentage of each component is: sodium carbonate: 94%, sodium bromide: 5%, and the rest is metal and miscellaneous salts, such as figure 1 shown, including the following steps:

[0040] A, dissolving and filtering of PTA incineration boiler ash: the PTA incineration boiler ash with waste heat is dissolved in ash dissolving tank 1 with desalted water to be dissolved into a solution containing 27.07% of sodium carbonate and 1.44% of sodium bromide. The pH of the solution is about 12, and the temperature is 50°C. Metal sintered filter 2 is used to remove metal and other insoluble matter, and the obtained filter residue is discharged into filter residue storage tank 3, and the filtrate enters sodium carbonate crystallization raw material tank 4;

[0041] B, sodium carbonate evaporative crystallization: the filtrate in the s...

Embodiment 2

[0046] A PTA incineration boiler ash solution salt separation crystallization process, the quality of the PTA incineration boiler ash is about 1240Kg / h, the weight percentage of each component is: sodium carbonate: 88%, sodium bromide: 11%, the rest is Metals and miscellaneous salts, such as figure 1 shown, including the following steps:

[0047] A. Dissolving and filtering of PTA incineration boiler ash: add desalted water to dissolve the PTA incineration boiler ash with waste heat in the ash dissolving tank 1 to a solution containing about 25.20% of sodium carbonate and about 3.20% of sodium bromide, The pH value of the solution is about 12, and the temperature is about 60°C. Metal sintered filter 2 is used to remove metal and other insoluble matter, and the obtained filter residue is discharged into filter residue storage tank 3, and the filtrate enters sodium carbonate crystallization raw material tank 4;

[0048] B, sodium carbonate evaporative crystallization: the filtr...

Embodiment 3

[0053] A PTA incineration boiler ash solution salt separation crystallization process, the quality of the PTA incineration boiler ash is about 1348Kg / h, the weight percentage of each component is: sodium carbonate: 81%, sodium bromide: 18%, the rest is Metals and miscellaneous salts, such as figure 1 shown, including the following steps:

[0054] A, dissolving and filtering of PTA incineration boiler ash: the PTA incineration boiler ash with waste heat is dissolved in ash dissolving tank 1 with desalted water to be dissolved into a solution containing 23.20% of sodium carbonate and 5.23% of sodium bromide. The pH value of the solution is about 12, and the temperature is 70°C. Metal sintered filter 2 is used to remove metal and other insoluble matter, and the obtained filter residue is discharged into filter residue storage tank 3, and the filtrate enters sodium carbonate crystallization raw material tank 4;

[0055] B, sodium carbonate evaporative crystallization: the filtrat...

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Abstract

The invention relates to a PTA incineration boiler ash residue solution salt separation crystallization process, and belongs to the technical field of evaporative crystallization. The process comprises the following steps of: dissolving ash of the PTA incineration boiler with waste heat into a nearly saturated solution of sodium carbonate and sodium bromide, and removing metals and other insoluble substances from the solution by adopting a metal sintering filter, separating the obtained filtrate by adopting an evaporative crystallization method to obtain sodium carbonate monohydrate crystals, removing sodium carbonate from the mother liquor by adopting a replacement method, and then separating by adopting an evaporative crystallization method to obtain sodium bromide crystals. Sodium carbonate and sodium bromide in the PTA boiler ash are separated and recovered by adopting an evaporative crystallization method, the process flow is simple, the operation conditions are simple, convenient and stable, and industrialization is facilitated; the high-purity sodium carbonate and sodium bromide recovered by the method can meet the quality requirements of industrial-grade products and can be directly recovered and reused or sold as by-products, so that the purpose of treating waste residues and wastewater is achieved, the requirements of the current environmental protection situation are met, waste can be turned into wealth, recycling of salt is realized, and the benefits of factories are improved.

Description

technical field [0001] The invention relates to a salt separation and crystallization process of a PTA incineration boiler ash solution, belonging to the technical field of evaporation crystallization. Background technique [0002] Purified terephthalic acid (PTA) is the main raw material for the manufacture of polyester fibers, films, and insulating varnishes. It is mainly used to produce polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), etc. It can also be used as a dye intermediate. In recent years, my country's PTA production has shown a rapid growth trend year by year, but the resulting waste residue and waste water have also brought enormous pressure on the environment. Since the main components of incinerator ash are sodium carbonate and sodium bromide, reasonable recovery can bring greater economic value. Sodium carbonate is one of the important chemical raw materials, widely used in light industry daily chemical, building materials, chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/40C01D7/24C01D3/10C01D3/24C01D3/14
CPCC01D7/40C01D7/24C01D3/10C01D3/24C01D3/14C01P2006/80Y02P20/129
Inventor 武彦芳王国清曹吉林李楼胡晓静郭瑞亚李宁吴浪唐少康
Owner 河北工大晟珂工程科技有限公司
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