CN107051118A - A kind of alum decomposes kiln exhaust gas recycle and reuse technique - Google Patents

A kind of alum decomposes kiln exhaust gas recycle and reuse technique Download PDF

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Publication number
CN107051118A
CN107051118A CN201710053305.2A CN201710053305A CN107051118A CN 107051118 A CN107051118 A CN 107051118A CN 201710053305 A CN201710053305 A CN 201710053305A CN 107051118 A CN107051118 A CN 107051118A
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CN
China
Prior art keywords
sulfuric acid
alum
absorbing liquid
ammonia
exhaust gas
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Pending
Application number
CN201710053305.2A
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Chinese (zh)
Inventor
陈珍富
王国良
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Sichuan Province Long Crystal Technology Co Ltd
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Sichuan Province Long Crystal Technology Co Ltd
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Priority to CN201710053305.2A priority Critical patent/CN107051118A/en
Publication of CN107051118A publication Critical patent/CN107051118A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1481—Removing sulfur dioxide or sulfur trioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/73—After-treatment of removed components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B01D2252/102—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/406—Ammonia

Abstract

The invention belongs to air contaminant treatment field, more particularly to a kind of alum decomposes kiln exhaust gas recycle and reuse technique.Technical problem solved by the invention is to provide a kind of alum and decomposes kiln exhaust gas recycle and reuse technique, it is high with desulfurization and ammonia removal efficiency, tail gas is entirely capable of the advantage of qualified discharge, can also further produce and obtain High-Purity Aluminum Ammonium Sulfate, realizes recycling for resource.Present invention process includes：A, reaction unit contained into SO3And NH3Tail gas be first passed through sulfuric acid absorption device and ammonia absorption plant, tail gas qualified discharge；B, maintain sulfuric acid absorption device absorbing liquid sulfuric acid concentration between 65 70% and ammonia absorption plant absorbing liquid pH value be 6.5 7.5, partially absorb liquid in amount removed device respectively；C, the logical tail gas of continuation, repeat step A, B；D, the absorbing liquid mixing progress neutralization reaction by removal, obtain aluminum ammonium sulfate solution；E, Solid aluminum sulfate ammonium is made in the aluminum ammonium sulfate solution described in step D.

Description

A kind of alum decomposes kiln exhaust gas recycle and reuse technique
Technical field
The invention belongs to air contaminant treatment field, more particularly to a kind of alum decomposes kiln exhaust gas recycle and reuse Technique.
Background technology
Sapphire (Sapphire) is a kind of alundum (Al2O3) (α and Al2O3) monocrystalline, also known as corundum.It is artificial blue precious Masonry is a kind of important artificial-synthetic crystal, has been widely used in many necks of science and technology, national defence and civilian industry Domain.There have been 40 many enterprises' investment and production sapphire crystals the country within nearly 2 years, and Chinese sapphire enterprise can go from strength to strength, and Foreign countries also have many enterprises to carry out Chinese foundation production sapphire crystal, and following LED market can pour into China.Sapphire crystallization pair The demand of high-purity alundum (Al2O3) can be increasing, and the market prospects of high purity aluminium oxide are considerable.
At present, prepare the method for high purity aluminium oxide powder mainly have choline aluminium Hydrolyze method, alum pyrolysismethod, Aluminium carbonate ammonium pyrolysismethod, aluminium isopropoxide Hydrolyze method, rafifinal activation Hydrolyze method etc..
Although alum pyrolysismethod technique is relatively simple, technology is more ripe, and cost is relatively low, is produced in decomposable process A large amount of SO3And NH3If, without effective recovery, it will cause severe contamination to environment；The country's also not good recovery at present Processing method, this is also the technology development for limiting alum pyrolysismethod and the main cause promoted.With Environmental It is increasingly stricter that protection is required, because problem of environmental pollution, this method is it could even be possible to the danger gradually eliminated.
Present invention process is under this application background, and solving alum pyrolysismethod production high purity aluminium oxide may be right The problem of environment causes severe contamination, and also by the SO of recovery3And NH3Production obtains out high-purity alum, realizes sulfuric acid Aluminium ammonium is recycled., alum pyrolysismethod will be made, which to produce high purity aluminium oxide, to have wide market prospects.
The content of the invention
Technical problem solved by the invention is to provide a kind of alum and decomposes kiln exhaust gas recycle and reuse technique, tool There are desulfurization and ammonia removal efficiency height, tail gas is entirely capable of the advantage of qualified discharge, can also further produce and obtain High-Purity Aluminum Ammonium Sulfate, Realize recycling for resource.
Alum of the present invention decomposes kiln exhaust gas recycle and reuse technique, comprises the following steps：
A, by what reaction unit roller kilns were produced contain SO3And NH3Tail gas be first passed through sulfuric acid absorption tower absorption plant, tail SO in gas3And NH3Reaction, which is carried out, with circulating absorption solution removes most SO3And NH3, absorb and fill subsequently into ammonia absorber Put, remove unabsorbed SO3Afterwards, qualified discharge；
Wherein, circulating absorption solution includes sulfuric acid and ammonium sulfate in control sulfuric acid absorption device tower, and solvent is water, absorbing liquid Sulfuric acid concentration is 65-70%；
Circulating absorption solution in ammonia absorption plant is controlled to include ammonia and ammonium sulfate, solvent is water, and the pH value of absorbing liquid is 6.5- 7.5；
B, when sulfuric acid concentration is close to 70% in the middle circulating absorption solution for the sulfuric acid absorption device tower that step A is obtained, by portion Divide circulating absorption solution to remove sulfuric acid absorption device, and supplement part water simultaneously, to maintain the sulfuric acid concentration in circulating absorption solution to exist Between 65-70%；Part ammonium hydrogen carbonate, dimension are supplemented when ammonia in ammonia absorption plant and ammonium sulfate circulating absorption solution PpH values≤6.5 Hold the PpH values 6.5-7.5 of circulating absorption solution in ammonia absorber；Part circulating absorption solution is removed into ammonia absorber simultaneously and absorbs dress Put；
C, it is continuous be passed through roller kilns generation into sulfuric acid absorption device tower and ammonia absorber device contain SO3And NH3Tail Gas, then repeat step A, B；
D, the circulating absorption solution removed respectively in step B mixed in enamel reaction still, and add ammonium hydrogen carbonate and hydrogen Aluminum oxide carries out neutralization reaction, obtains aluminum ammonium sulfate solution；
E, the aluminum ammonium sulfate solution described in step D conventionally concentrated, crystallisation by cooling, recrystallization, filtering It can obtain high purity solid alum；.
Further, realization is recycled, and can also carry out following steps F operation：
It F, will be decomposed in the alum return roller table kiln reaction unit described in step E, obtain three high-purity oxidations Two aluminium powder material, realize the recycling of alum.
In above-mentioned technical proposal, the reaction unit is roller kilns；The sulfuric acid absorption device is sulfuric acid absorption tower；It is described Ammonia absorption plant is ammonia absorber.
In above-mentioned technical proposal, step D is to carry out neutralization reaction in a kettle.；It is preferred that the reactor for enamel it is anti- Answer kettle.
Removed in above-mentioned technical proposal, described in step B and partially absorb liquid, the amount once removed is the 20% of circulating absorption solution Left and right.
Alum of the present invention decomposes kiln exhaust gas recycle and reuse technique, the generation that alum in roller kilns is decomposed Contain SO3And NH3Tail gas desulfurization and deamination reaction are carried out in sulfuric acid absorption tower, further taken off in ammonia absorber Reaction of Salmon-Saxl, and circulating absorption solution with ammonium hydrogen carbonate ammonia and aluminium hydroxide neutralize obtain alum, production high-purity Go out alum product, and realize recycling for alum.
In sulfuric acid absorption tower, SO3Water in gas and circulating absorption solution reacts generation sulfuric acid, NH3With sulfuric acid reaction Ammonium sulfate is generated, water and sulfuric acid solution are main absorbers；In ammonia absorber, NH3With SO3Gas and water reaction generation sulfuric acid Ammonium, NH3It is main absorber.Key reaction is as follows：
1st, the key reaction in sulfuric acid absorption tower：
SO3+2NH3+H2O=(NH4)2SO4
SO3+H2O=H2SO4
2nd, the key reaction in ammonia absorber：
SO3+2NH4HCO3=(NH4)2SO4+2CO2+H2O
3rd, the key reaction in enamel reaction still：
(NH4)2SO4+H2SO4+Al2O3+24H2O=Al2(SO4)3.(NH4)2SO4。24H2O
Beneficial effects of the present invention：Alum of the present invention decomposes kiln exhaust gas recycle and reuse technique, solves long-term Since alum decompose problem of environmental pollution in high purity aluminium oxide technology processed, rate of recovery height can obtain high-purity Alum product, realizes recycling for alum.And to SO3Extrusion rate reaches more than 99%, to NH3Extrusion rate It can reach SO in more than 99.95%, emission3Concentration≤35mg/Nm3, NH3Concentration≤8mg/Nm3, it is entirely capable of reaching The discharge standard of national regulation, environmentally friendly, the product utilization value of generation is high.
Brief description of the drawings
Fig. 1 alum decomposed tail gas recycle and reuse process charts.
Embodiment
The embodiment of form, remakes further specifically to the above of the invention by the following examples It is bright, illustrate but do not limit the present invention.
Embodiment 1
Alum decomposed tail gas recycle and reuse technique, flow chart is as shown in figure 1, comprise the following steps：
A, roller kilns are preheating to after 1000 DEG C, then alum is added in roller kilns by 500kg/h speed, now Alum, which decomposes to produce, contains H2O、SO3And NH3Tail gas, what low-temperature space was produced when decomposing contains H2O tail gas is passed directly into water absorption Tower, is cooled to liquid water.What high-temperature region was produced when decomposing contains SO3And NH3Tail gas is first passed through sulfuric acid absorption tower, uses sulfur acid 65- 66% circulating absorption solution is as absorbent, most SO in tail gas3And NH3It is removed；Then gas enter ammonia absorber with The ammonia absorbing liquid of circulation is reacted, and removes unabsorbed SO3.Sulfur acid is obtained in sulfuric acid absorption tower and ammonium sulfate circulation is inhaled Liquid is received, the sulfuric acid concentration that sulfuric acid circulating absorption solution is controlled by adding water is 65-66%；Ammonia absorber obtains ammonia and ammonium sulfate circulation Absorbing liquid, controls the pH value 6.5-7.5 of ammonia circulating absorption solution；Tail gas SO3Extrusion rate is 99%, NH3Extrusion rate 99.95%, discharge SO in tail gas3Concentration≤35mg/Nm3, NH3Concentration≤8mg/Nm3, meet the discharge standard of national regulation.
When sulfuric acid concentration is higher than 66% in circulating absorption solution in B, the sulfuric acid absorption tower for obtaining step A, part is followed Ring absorbing liquid removes sulfuric acid absorption tower to storage tank；Part water is supplemented simultaneously, maintains the sulfuric acid concentration in circulating absorption solution in 65- 66%；Ammonium hydrogen carbonate is supplemented when ammonia and ammonium sulfate circulating absorption solution pH value≤6.5, the pH value 6.5-7.5 of circulating absorption solution is maintained； Part circulating absorption solution is removed into ammonia absorber to storage tank simultaneously；
C, continuously the gas decomposed in roller kilns is passed through in sulfuric acid absorption tower and ammonia absorber, then repeat step A, B；
D, the sulfuric acid circulating absorption solution removed in step B and ammonia circulating absorption solution added into reactor after metering in proportion After interior mixing and 20kg/h ammonium hydrogen carbonate and 86kg/h aluminium hydroxides are added, be heated to carrying out neutralization reaction 2.5 at 105 DEG C small When, aluminum ammonium sulfate solution is obtained, described aluminum ammonium sulfate solution is concentrated, crystallisation by cooling, vacuum are crossed from obtaining about 485kg/h Solid aluminum sulfate ammoniums；
E, the Solid aluminum sulfate ammonium return roller table kiln for obtaining step D are recycled.
Embodiment 2
Alum decomposed tail gas recycle and reuse technique, flow chart is as shown in figure 1, comprise the following steps：
A, roller kilns are preheating to after 1000 DEG C, then alum is added in roller kilns by 1000kg/h speed, this When alum decompose produce contain H2O、SO3And NH3Tail gas, what low-temperature space was produced when decomposing contains H2O tail gas is passed directly into water absorption Tower, is cooled to liquid water.What high-temperature region was produced when decomposing contains SO3And NH3Tail gas is first passed through sulfuric acid absorption tower, uses sulfur acid 68- 70% circulating absorption solution is as absorbent, most SO in tail gas3And NH3It is removed；Then gas enter ammonia absorber with The ammonia absorbing liquid of circulation is reacted, and removes unabsorbed SO3.Sulfur acid is obtained in sulfuric acid absorption tower and ammonium sulfate circulation is inhaled Liquid is received, the sulfuric acid concentration that sulfuric acid circulating absorption solution is controlled by adding water is 68-70%；Ammonia absorber obtains ammonia and ammonium sulfate circulation Absorbing liquid, controls the pH value 6.5-7.5 of ammonia circulating absorption solution；Tail gas SO3Extrusion rate is 99.5%, NH3Extrusion rate 99.99%, row Put SO in tail gas3Concentration≤35mg/Nm3, NH3Concentration≤8mg/Nm3, meet the discharge standard of national regulation.
When sulfuric acid concentration is higher than 70% in circulating absorption solution in B, the sulfuric acid absorption tower for obtaining step A, part is followed Ring absorbing liquid removes sulfuric acid absorption tower to storage tank；Part water is supplemented simultaneously, maintains the sulfuric acid concentration in circulating absorption solution in 68- 70%；Ammonium hydrogen carbonate is supplemented when ammonia and ammonium sulfate circulating absorption solution pH value≤6.5, the pH value 6.5-7.5 of circulating absorption solution is maintained； Part circulating absorption solution is removed into ammonia absorber to storage tank simultaneously；
C, continuously the gas decomposed in roller kilns is passed through in sulfuric acid absorption tower and ammonia absorber, then repeat step A, B；
D, the sulfuric acid circulating absorption solution removed respectively in step B and ammonia circulating absorption solution added after metering in proportion it is anti- Answer after being mixed in kettle and add 40kg/h ammonium hydrogen carbonate and 172kg/h aluminium hydroxides, be heated to carrying out neutralization reaction at 110 DEG C 2 hours, aluminum ammonium sulfate solution is obtained, described aluminum ammonium sulfate solution is concentrated, crystallisation by cooling, vacuum are crossed from obtaining about 980kg/h Solid aluminum sulfate ammoniums；
E, the Solid aluminum sulfate ammonium return roller table kiln for obtaining step D are recycled.

Claims (7)

1. alum decomposes kiln exhaust gas recycle and reuse technique, it is characterised in that：Comprise the following steps：
A, reaction unit contained into SO3And NH3Tail gas be first passed through SO in sulfuric acid absorption device, tail gas3And NH3Enter with absorbing liquid Row reaction removes most SO3And NH3, subsequently into ammonia absorption plant, tail gas removes unabsorbed SO3Qualified discharge afterwards； Wherein, absorbing liquid is sulfuric acid and ammonium sulfate in sulfuric acid absorption device, and the sulfuric acid concentration of absorbing liquid is 65-70%；Ammonia absorption plant Middle absorbing liquid is ammonia and ammonium sulfate, and the pH value of absorbing liquid is 6.5-7.5；
B, when sulfuric acid concentration is more than 70% in the absorbing liquid of step A sulfuric acid absorption devices, will partially absorb liquid remove sulfuric acid inhale Receiving apparatus, and supplement add water to maintain the sulfuric acid concentration in absorbing liquid between 65-70%；When the absorption liquid pH of ammonia absorption plant Supplement ammonium hydrogen carbonate maintains the pH value 6.5-7.5 of absorbing liquid during value≤6.5；Liquid will be partially absorbed simultaneously removes ammonia absorption plant；
C, continuously it is passed through into sulfuric acid absorption device and ammonia absorption plant containing SO3And NH3Tail gas, then repeat step A, B；
D, the absorbing liquid removed respectively in step B mixed, and add ammonium hydrogen carbonate and aluminium hydroxide and carry out neutralization reaction, obtained Aluminum ammonium sulfate solution；
E, the aluminum ammonium sulfate solution described in step D conventionally concentrated, crystallisation by cooling, recrystallizes, be filtrated to get Solid aluminum sulfate ammonium.
2. alum according to claim 1 decomposes kiln exhaust gas recycle and reuse technique, it is characterised in that：Step E The further utilization of gained alum：
Step F, alum described in step E returned and decomposed in reaction unit, obtain alundum (Al2O3) powder.
3. alum according to claim 1 decomposes kiln exhaust gas recycle and reuse technique, it is characterised in that：It is described anti- It is roller kilns to answer device.
4. alum according to claim 1 decomposes kiln exhaust gas recycle and reuse technique, it is characterised in that：The sulphur Sour absorption plant is sulfuric acid absorption tower.
5. alum according to claim 1 decomposes kiln exhaust gas recycle and reuse technique, it is characterised in that：The ammonia Absorption plant is ammonia absorber.
6. alum according to claim 1 decomposes kiln exhaust gas recycle and reuse technique, it is characterised in that：Step D It is to carry out neutralization reaction in a kettle..
7. alum according to claim 6 decomposes kiln exhaust gas recycle and reuse technique, it is characterised in that：It is described anti- It is enamel reaction still to answer kettle.
CN201710053305.2A 2017-01-22 2017-01-22 A kind of alum decomposes kiln exhaust gas recycle and reuse technique Pending CN107051118A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109650627A (en) * 2019-01-04 2019-04-19 南京馥安投资管理有限公司 A kind of organic liquid waste resource utilization method containing ammonium sulfate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090104099A1 (en) * 2007-10-17 2009-04-23 Au-Yeung Patrick H Rich gas absorption apparatus and method
CN104941404A (en) * 2015-06-10 2015-09-30 云南驰宏锌锗股份有限公司 Deep tail gas purification method for fuming furnace

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090104099A1 (en) * 2007-10-17 2009-04-23 Au-Yeung Patrick H Rich gas absorption apparatus and method
CN104941404A (en) * 2015-06-10 2015-09-30 云南驰宏锌锗股份有限公司 Deep tail gas purification method for fuming furnace

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
高劲豪，高原: "硫酸铝铵法氧化铝生产中尾气的循环利用", 《山东化工》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109650627A (en) * 2019-01-04 2019-04-19 南京馥安投资管理有限公司 A kind of organic liquid waste resource utilization method containing ammonium sulfate

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