CN111410211B - Sintering machine head ash filtrate deamination treatment method - Google Patents
Sintering machine head ash filtrate deamination treatment method Download PDFInfo
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- CN111410211B CN111410211B CN202010327935.6A CN202010327935A CN111410211B CN 111410211 B CN111410211 B CN 111410211B CN 202010327935 A CN202010327935 A CN 202010327935A CN 111410211 B CN111410211 B CN 111410211B
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- filtrate
- deamination
- ammonia
- sintering machine
- machine head
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- 239000000706 filtrate Substances 0.000 title claims abstract description 62
- 230000009615 deamination Effects 0.000 title claims abstract description 61
- 238000006481 deamination reaction Methods 0.000 title claims abstract description 61
- 238000005245 sintering Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 38
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 116
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 46
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 40
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000001103 potassium chloride Substances 0.000 claims abstract description 20
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 20
- 239000012452 mother liquor Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 15
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000011591 potassium Substances 0.000 claims abstract description 14
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 14
- 238000010521 absorption reaction Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000000746 purification Methods 0.000 claims abstract description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 3
- 239000011259 mixed solution Substances 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 9
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 5
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 5
- 239000011152 fibreglass Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 18
- 235000011114 ammonium hydroxide Nutrition 0.000 description 18
- 238000005507 spraying Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- -1 magnesium nitride Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/24—Sulfates of ammonium
- C01C1/242—Preparation from ammonia and sulfuric acid or sulfur trioxide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Treating Waste Gases (AREA)
Abstract
A sintering machine head ash filtrate deamination treatment method belongs to the field of sintering machine head ash filtrate deamination treatment, and comprises the following substances in parts by weight: the method comprises the following steps: mixing the sintering machine head ash and clear water, stirring for 1-1.5h, carrying out solid-liquid separation, and reserving filtrate for later use; step two: adding the filtrate obtained in the step one into a buffer tank, adding a potassium chloride mother liquor containing ammonium chloride, mixing with the filtrate, and obtaining a mixed liquor after mixing; step three: the mixed liquid is pumped into a deamination tower through a deamination centrifugal pump, ammonia volatilizes from the mixed liquid, the ammonia is sent into an ammonia absorption tank filled with concentrated sulfuric acid through a vacuum pump, the mixed liquid with the ammonia removed falls to the bottom of the deamination tower, and the mixed liquid with the ammonia removed is sent into a purification process through a purification centrifugal pump. The ammonia gas content in the treated filtrate is reduced to below 1g/L from 5-10g/L, and the potassium content in the filtrate can be increased to 160g/L-220g/L by adding the potassium chloride mother liquor, so that the full utilization of resources is realized, and the energy is effectively saved.
Description
Technical Field
The invention belongs to the field of sintering machine head ash filtrate deamination treatment, and particularly relates to a sintering machine head ash filtrate deamination treatment method and a preparation method thereof.
Background
When the sintering machine head ash is used for producing potassium chloride, because the sintering machine head ash contains nitrides such as magnesium nitride and the like, ammonia gas is generated in the wet leaching process, part of ammonia gas is combined with water to produce ammonia water, and the rest ammonia gas escapes into the air, so that the environmental pollution is caused, and the operation environment is severe. After the first ash filtrate of the sintering machine is purified, ammonia gas still exists in the purified filtrate in the form of ammonia water, even if the PH of the purified filtrate is adjusted to 7.5-8, the ammonia gas cannot be removed, the ammonia gas enters an evaporative crystallization system, and finally the ammonia gas is converted into ammonium chloride and exists in mother liquor, so that the mother liquor is acidic and corrodes equipment. By combining the characteristics of the process for producing potassium chloride by sintering machine head ash, how to thoroughly remove ammonia can solve the environmental protection problem and comprehensively utilize ammonia.
The Chinese patent with the application number of 201720668205.6 and the invention name of 'a deamination tower' discloses: a deamination tower, comprising: the device comprises a tower body, wherein an air inlet pipe, a liquid level meter and a water discharge pipe are arranged on the side wall close to the bottom of the tower body, a sludge discharge port is arranged on the bottom surface of the tower body, a discharge port is arranged on the top surface of the top of the tower body, a demister, a first air distribution plate and a second air distribution plate are arranged in the tower body, and a water discharge valve is arranged on the water discharge pipe; the device comprises a waste liquid tank, a pH value detector and an alkali liquid filling port are arranged on the side surface of the waste liquid tank, and a water inlet and a water outlet are arranged on the top of the waste liquid tank; the first spraying device comprises a first connecting pipe, a first spraying pipe, a first water pump and a first spray head, wherein one end of the first connecting pipe is connected with the water outlet; a part of the first spraying pipe extends into the tower body, and the part of the first spraying pipe extending into the tower body is positioned between the demister and the first air distribution plate; the second spray device comprises a second connecting pipe, a second spray pipe, a second water pump and a second spray head, wherein one end of the second connecting pipe is arranged in the tower body; and one part of the second spraying pipe extends into the tower body, and the part of the second spraying pipe extending into the tower body is positioned between the first air distribution plate and the second air distribution plate. The patent is not enough to only aim at the conventional ammonia-containing wastewater, and the wastewater is not treated, so that the removal efficiency is low.
The invention discloses a Chinese invention patent with the application number of 201510142238.2 and the invention name of 'an energy-saving deamination method for negative pressure deamination of coking residual ammonia water', which discloses: conveying the residual ammonia water to a liquid distributor at the upper part of a stripping section of the deamination tower, and enabling the residual ammonia water to flow through a packing layer of the stripping section from top to bottom after liquid distribution; heating the residual ammonia water by adopting waste heat of the enterprise circulating diluted ammonia water, returning the residual ammonia water to the deamination tower, and continuously evaporating under the negative pressure of 20-28KPa to generate secondary steam; the secondary steam passes through a packing layer of a stripping section from bottom to top and contacts with the residual ammonia water flowing reversely to deaminate the residual ammonia water; when the residual ammonia water reaches the bottom of the tower, the residual ammonia water becomes qualified residual ammonia water meeting the requirements, and the qualified residual ammonia water is extracted from the tower; when secondary steam reaches the top of the deamination tower, most ammonia gas is absorbed, the secondary steam is led out from the deamination tower and enters a condenser, ammonia mixed gas pumped out by the condenser is led into an ammonia absorption tower, desalted water is used for cyclic absorption, 10-20% concentrated ammonia water is produced and conveyed to a concentrated ammonia water storage tank for standby or sale, and dilute ammonia water condensed by the condenser continues deamination in a reflux tower. The disadvantages of this patent are: the treatment steps are complex, the process pertinence is strong, and the method is only suitable for treating ammonia water with higher concentration to remove ammonia.
The prior art has the following problems when the sintering machine first ash deamination operation is carried out: 1. ammonia gas in the sintering machine head ash filtrate is removed, but the ammonia gas is difficult to remove in a desulfurizing tower at normal temperature; 2. the mother liquor of potassium chloride evaporation crystallization contains ammonium chloride, which affects the quality of potassium chloride products; 3. the potassium content in the sintering machine head ash filtrate is only about 120g/L, the concentration cannot be further improved, and the steam consumption cost is increased.
Disclosure of Invention
The invention provides a sintering machine head ash filtrate deamination treatment method, which is used for overcoming the defects in the prior art.
The invention is realized by the following technical scheme:
a sintering machine head ash filtrate deamination treatment method comprises the following substances in parts by weight:
the method comprises the following steps: mixing the sintering machine head ash and clear water, stirring for 1-1.5h, carrying out solid-liquid separation, and reserving filtrate for later use;
step two: adding the filtrate obtained in the step one into a buffer tank, adding a potassium chloride mother liquor containing ammonium chloride, mixing with the filtrate, and obtaining a mixed liquor after mixing;
step three: the mixed liquid is pumped into a deamination tower through a deamination centrifugal pump and is sprayed out from a spray head arranged at the upper part in the deamination tower, the deamination tower passes through steam with the temperature of 150-200 ℃, ammonia volatilizes from the mixed liquid after the steam contacts the mixed liquid, the ammonia is sent into an ammonia absorption tank filled with concentrated sulfuric acid through a vacuum pump, the concentrated sulfuric acid absorbs the ammonia to form ammonium sulfate, residual air is discharged through an exhaust pipe arranged on the ammonia absorption tank, the mixed liquid with the ammonia removed simultaneously falls to the bottom of the deamination tower, and the mixed liquid with the ammonia removed is sent into a purification process through a purification centrifugal pump.
According to the method for deaminating sintering machine head ash filtrate, in the first step, the sintering machine head ash and clean water are mixed according to the ratio of 1.5: 1-2: 1 solid-to-liquid ratio.
According to the method for deaminating sintering machine head ash filtrate, the ammonia gas content in the filtrate obtained in the step one is 5-10g/L, and the potassium content is 120 g/L.
The deamination treatment method for the sintering machine head ash filtrate is characterized in that the temperature of the filtrate obtained in the step one is 15-20 ℃.
According to the method for deaminating sintering machine head ash filtrate, the ammonium chloride content in the potassium chloride mother liquor used in the second step is 3-8 g/L.
In the method for deaminating sintering machine dust filtrate, the temperature of the potassium chloride mother liquor used in the second step is 65-75 ℃.
According to the method for deaminating sintering machine head ash filtrate, in the second step, the filtrate and the potassium chloride mother liquor are mixed according to the ratio of 3: 1-4: the volume ratio of 1 was mixed in a buffer tank.
According to the method for deaminating sintering machine head ash filtrate, the mixed liquid obtained in the second step contains 160-220 g/L of potassium.
In the method for deaminating sintering machine top ash filtrate, the temperature of the mixed solution obtained in the second step is 25-35 ℃.
According to the deamination treatment method for the sintering machine top ash filtrate, the deamination tower in the third step is made of glass fiber reinforced plastic.
The deamination treatment method for the sintering machine head ash filtrate is described.
The invention has the advantages that: the ammonia gas content in the treated filtrate is reduced to below 1g/L from 5-10g/L, meanwhile, the potassium content in the filtrate can be increased to 160g/L-220g/L by adding the potassium chloride mother liquor, and the ammonium chloride content in the potassium chloride mother liquor can be reduced to below 0.2% from 1% -1.5%, so that the full utilization of resources is realized, and the energy is effectively saved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The method comprises the following steps: sintering machine head ash and clean water are mixed according to the proportion of 1.7: 1, stirring for 1h, and carrying out solid-liquid separation to obtain a filtrate with the ammonia gas content of 9g/L, the potassium content of 114g/L and the temperature of 18 ℃ for later use;
step two: adding the filtrate obtained in the step one into a buffer tank, adding potassium chloride mother liquor with the ammonium chloride content of 7g/L and the temperature of 71 ℃ according to the proportion of 1: 4, mixing the filtrate with the mixed solution in a volume ratio of 32 ℃ to obtain a mixed solution;
step three: the mixed liquid is pumped into a deamination tower through a deamination centrifugal pump and is sprayed out from a spray head arranged at the upper part in the deamination tower, the deamination tower passes through steam with the temperature of 150-200 ℃, ammonia volatilizes from the mixed liquid after the steam contacts the mixed liquid, the ammonia is sent into an ammonia absorption tank filled with concentrated sulfuric acid through a vacuum pump, the concentrated sulfuric acid absorbs the ammonia to form ammonium sulfate, residual air is discharged through an exhaust pipe arranged on the ammonia absorption tank, the mixed liquid with the ammonia removed simultaneously falls to the bottom of the deamination tower, and the mixed liquid with the ammonia removed is sent into a purification process through a purification centrifugal pump to be purified.
And detecting the mixed solution from which ammonia gas is removed in the third step to obtain a mixed solution with ammonia gas content of 0.7g/L, potassium content of 213g/L and ammonium chloride content of 0.6 g/L.
Example 2
The method comprises the following steps: sintering machine head ash and clean water are mixed according to the ratio of 2: 1, stirring for 1.4h, and carrying out solid-liquid separation to obtain a filtrate with the ammonia gas content of 9.5g/L, the potassium content of 117.4g/L and the temperature of 17.4 ℃ for later use;
step two: adding the filtrate obtained in the step one into a buffer tank, adding potassium chloride mother liquor with the ammonium chloride content of 6.3g/L and the temperature of 67 ℃ according to the proportion of 1: 3.4, mixing the filtrate, and obtaining mixed liquor with the temperature of 26 ℃ after mixing;
step three: the mixed liquid is pumped into a deamination tower through a deamination centrifugal pump and is sprayed out from a spray head arranged at the upper part in the deamination tower, the deamination tower passes through steam with the temperature of 150-200 ℃, ammonia volatilizes from the mixed liquid after the steam contacts the mixed liquid, the ammonia is sent into an ammonia absorption tank filled with concentrated sulfuric acid through a vacuum pump, the concentrated sulfuric acid absorbs the ammonia to form ammonium sulfate, residual air is discharged through an exhaust pipe arranged on the ammonia absorption tank, the mixed liquid with the ammonia removed simultaneously falls to the bottom of the deamination tower, and the mixed liquid with the ammonia removed is sent into a purification process through a purification centrifugal pump to be purified.
And detecting the mixed solution from which ammonia gas is removed in the third step to obtain a mixed solution with the ammonia gas content of 0.5g/L, the potassium content of 198g/L and the ammonium chloride content of 0.4 g/L.
Example 3
The method comprises the following steps: sintering machine head ash and clean water are mixed according to the proportion of 1.5: 1, stirring for 1h, and carrying out solid-liquid separation to obtain a filtrate with the ammonia gas content of 7g/L, the potassium content of 11.7g/L and the temperature of 19 ℃ for later use;
step two: adding the filtrate obtained in the step one into a buffer tank, adding potassium chloride mother liquor with the ammonium chloride content of 6g/L and the temperature of 67 ℃ according to the proportion of 1: 4, mixing the filtrate with the mixed solution in a volume ratio of 29 ℃ to obtain a mixed solution;
step three: the mixed liquid is pumped into a deamination tower through a deamination centrifugal pump and is sprayed out from a spray head arranged at the upper part in the deamination tower, the deamination tower passes through steam with the temperature of 150-200 ℃, ammonia volatilizes from the mixed liquid after the steam contacts the mixed liquid, the ammonia is sent into an ammonia absorption tank filled with concentrated sulfuric acid through a vacuum pump, the concentrated sulfuric acid absorbs the ammonia to form ammonium sulfate, residual air is discharged through an exhaust pipe arranged on the ammonia absorption tank, the mixed liquid with the ammonia removed simultaneously falls to the bottom of the deamination tower, and the mixed liquid with the ammonia removed is sent into a purification process through a purification centrifugal pump to be purified.
And detecting the mixed solution from which ammonia gas is removed in the third step to obtain a mixed solution with ammonia gas content of 0.6g/L, potassium content of 204g/L and ammonium chloride content of 0.8 g/L.
Through the embodiments 1-3, the method disclosed by the invention can effectively remove ammonia gas, improve the potassium content of the filtrate, and reduce the ammonium chloride content in the potassium chloride mother liquor, so that resources are fully utilized, and the utilization rate of energy is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A sintering machine head ash filtrate deamination treatment method is characterized by comprising the following steps: the composition comprises the following substances in parts by weight:
the method comprises the following steps: mixing the sintering machine head ash and clear water, stirring for 1-1.5h, carrying out solid-liquid separation, and reserving filtrate for later use;
step two: adding the filtrate obtained in the step one into a buffer tank, adding a potassium chloride mother liquor containing ammonium chloride, mixing with the filtrate, and obtaining a mixed liquor after mixing;
step three: the mixed liquid is pumped into a deamination tower through a deamination centrifugal pump and is sprayed out from a spray head arranged at the upper part in the deamination tower, the deamination tower passes through steam with the temperature of 150-200 ℃, ammonia volatilizes from the mixed liquid after the steam contacts the mixed liquid, the ammonia is sent into an ammonia absorption tank filled with concentrated sulfuric acid through a vacuum pump, the concentrated sulfuric acid absorbs the ammonia to form ammonium sulfate, residual air is discharged through an exhaust pipe arranged on the ammonia absorption tank, the mixed liquid with the ammonia removed simultaneously falls to the bottom of the deamination tower, and the mixed liquid with the ammonia removed is sent into a purification process through a purification centrifugal pump.
2. The sintering machine head ash filtrate deamination treatment method according to claim 1, characterized in that: in the first step, the sintering machine head ash and the clear water are mixed according to the ratio of 1.5: 1-2: 1 solid-to-liquid ratio.
3. The sintering machine head ash filtrate deamination treatment method according to claim 1, characterized in that: the ammonia gas content in the filtrate obtained in the step one is 5-10g/L, and the potassium content is 120 g/L.
4. The sintering machine head ash filtrate deamination treatment method according to claim 1, characterized in that: the temperature of the filtrate obtained in the first step is 15-20 ℃.
5. The sintering machine head ash filtrate deamination treatment method according to claim 1, characterized in that: and the content of ammonium chloride in the potassium chloride mother liquor used in the second step is 3-8 g/L.
6. The sintering machine head ash filtrate deamination treatment method according to claim 1, characterized in that: the temperature of the potassium chloride mother liquor used in the second step is 65-75 ℃.
7. The sintering machine head ash filtrate deamination treatment method according to claim 1, characterized in that: and in the second step, the filtrate and the potassium chloride mother liquor are mixed according to the ratio of 3: 1-4: the volume ratio of 1 was mixed in a buffer tank.
8. The sintering machine head ash filtrate deamination treatment method according to claim 1, characterized in that: the mixed liquid obtained in the second step has potassium content of 160g/L-220 g/L.
9. The sintering machine head ash filtrate deamination treatment method according to claim 1, characterized in that: the temperature of the mixed solution obtained in the second step is 25-35 ℃.
10. The sintering machine head ash filtrate deamination treatment method according to claim 1, characterized in that: and the deamination tower in the third step is made of glass fiber reinforced plastic.
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| CN114956424B (en) * | 2022-05-31 | 2023-09-26 | 中冶赛迪技术研究中心有限公司 | Sintering machine head ash deamination method utilizing desulfurization waste liquid disposal system |
| CN115231753B (en) * | 2022-07-25 | 2024-02-02 | 中冶赛迪技术研究中心有限公司 | Method for treating sintering machine head ash by using membrane concentrated strong brine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5719078A (en) * | 1980-07-09 | 1982-02-01 | Babcock Hitachi Kk | Disposal of fly ash |
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| CN104355472A (en) * | 2014-10-28 | 2015-02-18 | 北京赛科康仑环保科技有限公司 | Inorganic ammonium salt-containing wastewater treatment system, treatment process and application of wastewater treatment system |
| CN105776250A (en) * | 2016-04-20 | 2016-07-20 | 武汉长海高新技术有限公司 | Method for extracting potassium chloride from sintering dust in iron and steel enterprises |
| DE102016122869A1 (en) * | 2016-11-28 | 2018-05-30 | Chemische Fabrik Budenheim Kg | Overall process for the treatment of biological waste |
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