CN110589856A - Method for recovering and separating potassium salt and sodium salt in waste incineration fly ash - Google Patents
Method for recovering and separating potassium salt and sodium salt in waste incineration fly ash Download PDFInfo
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- CN110589856A CN110589856A CN201910941482.3A CN201910941482A CN110589856A CN 110589856 A CN110589856 A CN 110589856A CN 201910941482 A CN201910941482 A CN 201910941482A CN 110589856 A CN110589856 A CN 110589856A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 41
- 159000000000 sodium salts Chemical class 0.000 title claims abstract description 24
- 238000004056 waste incineration Methods 0.000 title claims abstract description 23
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 title claims abstract description 18
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 71
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical class [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 68
- 150000003839 salts Chemical class 0.000 claims abstract description 34
- 239000011780 sodium chloride Substances 0.000 claims abstract description 34
- 239000001103 potassium chloride Substances 0.000 claims abstract description 30
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 30
- 238000005188 flotation Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000005406 washing Methods 0.000 claims abstract description 22
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000006004 Quartz sand Substances 0.000 claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000001110 calcium chloride Substances 0.000 claims abstract description 13
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 13
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 claims abstract description 12
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 11
- 239000000243 solution Substances 0.000 claims abstract description 11
- 239000012047 saturated solution Substances 0.000 claims abstract description 8
- 239000012267 brine Substances 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims abstract description 5
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000006260 foam Substances 0.000 claims abstract description 3
- 239000002002 slurry Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 17
- 238000001704 evaporation Methods 0.000 claims description 11
- 238000005201 scrubbing Methods 0.000 claims description 9
- 230000008020 evaporation Effects 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 150000001412 amines Chemical class 0.000 claims description 7
- 229910001385 heavy metal Inorganic materials 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 3
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 2
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 claims description 2
- BUHXFUSLEBPCEB-UHFFFAOYSA-N icosan-1-amine Chemical compound CCCCCCCCCCCCCCCCCCCCN BUHXFUSLEBPCEB-UHFFFAOYSA-N 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 2
- 239000001509 sodium citrate Substances 0.000 claims description 2
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 9
- 238000001914 filtration Methods 0.000 abstract description 9
- 239000012141 concentrate Substances 0.000 abstract 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 10
- 229910052700 potassium Inorganic materials 0.000 description 10
- 239000011591 potassium Substances 0.000 description 10
- 238000002425 crystallisation Methods 0.000 description 8
- 230000008025 crystallization Effects 0.000 description 8
- 239000004568 cement Substances 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 238000002386 leaching Methods 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- 238000001238 wet grinding Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
- C01D3/08—Preparation by working up natural or industrial salt mixtures or siliceous minerals
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
本发明涉及回收并分离垃圾焚烧飞灰中钾盐和钠盐的方法，包括：将石英砂与水从垃圾焚烧飞灰中提取钾盐、钠盐、钙盐，得高浓度含盐水，石英砂与飞灰分离后返回继续使用；高浓度含盐水用酸调pH为5～7，经蒸发浓缩得钾钠混盐及残余氯化钙饱和溶液；将钾钠混盐在饱和氯化钾、氯化钠溶液中浮选分离、过滤，泡沫产品为氯化钾，尾矿浆为氯化钠；浮选所得氯化钾和氯化钠分别用对应饱和盐水进行搅拌洗涤、过滤，得工业级氯化钾及氯化钠产品，洗涤液为饱和氯化钾、氯化钠混合液，返回浮选作为浮选介质补充液。本发明有效分离飞灰中可溶性盐：氯化钾、氯化钠及氯化钙，无需脱钙，得高纯度的或工业级氯化钾和氯化钠产品；极大提升处理工艺的效费比。
The invention relates to a method for recovering and separating potassium salt and sodium salt in waste incineration fly ash, comprising: extracting potassium salt, sodium salt and calcium salt from waste incineration fly ash with quartz sand and water to obtain high-concentration salt water, quartz sand After being separated from the fly ash, return to continue to use; the high-concentration brine contains acid to adjust the pH to 5-7, and evaporate and concentrate to obtain potassium-sodium mixed salt and residual calcium chloride saturated solution; mix potassium-sodium mixed salt in saturated potassium chloride, chloride Flotation separation and filtration in sodium chloride solution, the foam product is potassium chloride, and the tailings slurry is sodium chloride; the potassium chloride and sodium chloride obtained by flotation are stirred, washed and filtered with corresponding saturated brine respectively to obtain industrial grade chloride Potassium and sodium chloride products, the washing liquid is a mixture of saturated potassium chloride and sodium chloride, which is returned to the flotation as the supplementary liquid of the flotation medium. The present invention effectively separates soluble salts in fly ash: potassium chloride, sodium chloride and calcium chloride, and obtains high-purity or industrial-grade potassium chloride and sodium chloride products without decalcification; greatly improving the efficiency of the treatment process Compare.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method for recovering and separating potassium salt and sodium salt in waste incineration fly ash.
Background
China is a country with relatively poor potassium resources, the production of potassium salt in China is mainly extracted from salt lakes and seawater, and most of the other parts need to be imported from abroad. Research results show that the content of potassium and sodium salts in the incineration fly ash is up to more than 20 percent, and if the potassium and sodium salts are not utilized, a huge 'salt mine' is wasted. The potassium and sodium salts in the fly ash mainly exist in the form of chloride, and the content of chloride ions reaches about 20 percent. According to the characteristics of the components of the waste fly ash, the method for effectively disposing the waste fly ash by using the cement as the raw material is adopted, but the waste fly ash has high chloride ion content, and the cement is directly used as the cement raw material to cause skinning and blockage, so that the normal operation of a cement kiln is influenced. Therefore, the potassium and sodium salts in the waste incineration fly ash are separated and recovered, the content of chloride ions can be greatly reduced, the requirement and the suitability for subsequent cement kiln treatment can be met, and the resource treatment of the fly ash can be realized.
Hangzhou xiu environmental protection science and technology limited company patent No. CN109396163A discloses a garbage fly ash treatment process for improving the dissolution rate of chloride ions, and the process effectively improves the dissolution rate of chloride ions in fly ash by combining wet grinding with a three-stage water washing process. Another patent No. CN109455738A discloses a process for preparing high-quality industrial salt from fly ash from waste incineration, which comprises the steps of washing fly ash with water, removing heavy metals, decoloring, removing calcium, evaporating for crystallization and separating potassium and sodium. In the process, sodium chloride is obtained by primary centrifugal separation during evaporation crystallization, separated liquid is subjected to secondary centrifugal separation after being cooled and crystallized, the liquid subjected to secondary centrifugal separation enters the heavy metal removal step again, the solid subjected to secondary centrifugal separation is refined by taking saturated potassium chloride solution as refined washing liquid, and potassium chloride is obtained after tertiary centrifugal separation, wherein the heavy metal content of the potassium chloride is within the national standard requirement.
Chinese Zhongji International engineering Co., Ltd, patent No. CN110040748A discloses a method for producing potassium salt and sodium salt by using waste incineration fly ash, which comprises the steps of leaching the waste incineration fly ash with water to obtain leaching solution, removing calcium ions and heavy metal impurities in the leaching solution by sodium carbonate, sodium sulfide and other medicaments in sequence, and evaporating and crystallizing the leaching solution in multiple steps after removing impurities to obtain high-purity or industrial sodium chloride and potassium chloride crystals.
Patent No. CN109354041A of Nanjing Nanhuan Water science and technology Limited discloses a method for extracting potassium from fly ash water washing liquid, which comprises the steps of carrying out front-stage filtration on the fly ash water washing liquid and removing suspended matters, sequentially adding sulfuric acid and sodium sulfate for clarification and sludge filtration, carrying out evaporative crystallization on the clarified liquid to separate out sodium chloride, adding sodium sulfate for freezing crystallization, obtaining glaserite solid, and further purifying by using potassium chloride regulating solution to obtain potassium sulfate crystal salt with higher value.
However, in the above technical achievement, patent CN109396163A discloses a waste fly ash treatment process for improving the dissolution rate of chloride ions, which adopts a wet grinding combined with a three-stage water washing process to effectively improve the dissolution rate of chloride ions in fly ash. As the fly ash is from waste incineration, a certain proportion of aggregation particles which are difficult to disperse can be formed in the fly ash production process, the fly ash is directly mixed with water and is not uniform, soluble salts in the fly ash particles are difficult to dissolve out, and meanwhile, the fly ash particles are easy to agglomerate and agglomerate while the fly ash is stirred and washed, so that the soluble salts are difficult to dissolve out, therefore, the fly ash particles after wet grinding are finer and are easy to agglomerate and agglomerate, and the difficulty in subsequent filtration is increased. The fly ash is washed by water to obtain high-concentration salt water, mainly comprising potassium chloride, sodium chloride and calcium chloride, the contents of the potassium chloride, the sodium chloride and the calcium chloride are close to each other, decalcification and heavy metal removal treatment are required before an evaporation crystallization process is adopted, a large amount of sodium carbonate or sodium sulfate is required to be added in the decalcification process, the dosage of a medicament is large, the disposal cost is high, and a large amount of calcium mud is generated at the same time. The potassium and sodium salts are separated by an evaporative crystallization process, crystallization separation needs to be carried out in multiple steps, and washing water with approximate potassium and sodium contents cannot be effectively separated, so that the method is narrow in applicability.
Disclosure of Invention
The technical problem solved by the invention is to overcome the defects in the prior art, and provide a method for effectively separating soluble salt from fly ash, which comprises the following steps: potassium chloride, sodium chloride and calcium chloride, without decalcification, and obtaining high-purity or industrial-grade potassium chloride and sodium chloride products; the method has the advantages of high potassium-sodium salt extraction rate in the fly ash, high potassium-sodium mixed salt separation efficiency, greatly reduced operation cost, and greatly improved efficiency-cost ratio of the treatment process, and can be used for recovering and separating potassium salt and sodium salt in the waste incineration fly ash.
The technical scheme of the invention is that the method for recovering and separating the potassium salt and the sodium salt in the waste incineration fly ash is characterized by comprising the following steps:
(1) quartz sand and water are used for extracting soluble salts of potassium, sodium and calcium from waste incineration fly ash to obtain high-concentration salt-containing water, and the quartz sand and the fly ash are separated and then return to the process for continuous use;
(2) adjusting the pH value of the high-concentration salt-containing water obtained in the step (1) to 5-7 with acid, and evaporating and concentrating to obtain potassium-sodium mixed salt and residual calcium chloride saturated solution;
(3) carrying out flotation separation on the potassium-sodium mixed salt obtained in the step (2) in a saturated potassium chloride and sodium chloride solution, and filtering to obtain a foam product, namely potassium chloride and tailing slurry, namely sodium chloride;
(4) and (4) respectively stirring and washing the potassium chloride salt and the sodium chloride salt obtained by the flotation separation in the step (3) by using corresponding saturated saline water, filtering to obtain industrial potassium chloride and sodium chloride products, wherein the washing liquid is a mixed liquid of saturated potassium chloride and sodium chloride, and returning to the flotation process as a flotation medium supplementary liquid.
Preferably, the step (1) further comprises: the waste incineration fly ash mainly refers to fly ash with low heavy metal content, and soluble salts of potassium salt, sodium salt and calcium salt mainly include potassium chloride, sodium chloride and calcium chloride.
Preferably, the step (1) further comprises: the mass ratio of the quartz sand to the fly ash is 1: 2-2: 1, the granularity of the quartz sand is 40-60 meshes, the mass ratio of the fly ash to water is 1: 1-1: 4, the stirring speed is 200-500 r.min < -1 >, the stirring time is 10-60 min, and the scrubbing times are 2-5 times.
Preferably, the step (1) further comprises: the quartz sand and fly ash are separated by adopting a cyclone classifier, and the quartz sand is separated firstly and then the solid and the liquid are separated.
Preferably, the step (2) further comprises: the acid is hydrochloric acid, and the preferable evaporation pH range is 5-5.5.
Preferably, the step (3) further comprises: the flotation separation adopts a collecting agent which is self-made water-soluble amine, the amine comprises one or a mixture of ethylenediamine, dodecylamine, octadecylamine, eicosylamine and mixed amine, the inhibitor mainly comprises one or any two of citric acid, sodium citrate and carboxymethyl cellulose, and the waste brine generated after the flotation is filtered and then returns to the flow for continuous use.
Preferably, the step (4) further comprises: the amount of saturated salt water adopted for stirring and washing potassium chloride and sodium chloride is 2-5 times of the impurity content, the stirring and washing time is 10-60 min, and the saturated salt water after washing and separation returns to the flotation process to be used as flotation medium supplementary liquid.
Compared with the prior art, the invention has the beneficial effects that:
the method has the advantages that the quartz sand is adopted for scrubbing the fly ash, so that the dissolution rate of soluble salt in the fly ash can be effectively improved, high-concentration salt-containing water is obtained, the energy consumption during evaporative crystallization is greatly reduced, and the production cost is reduced;
the decalcification process is not needed, so that the consumption cost of the agent is reduced;
the evaporation process is effectively reduced, and the evaporation cost is reduced;
and the flotation process can effectively separate potassium-sodium mixed salt in any proportion, the adaptability is strong, flotation wastewater can be recycled, and secondary pollution is avoided.
Drawings
FIG. 1 is a simplified process flow diagram of the present invention;
FIG. 2 is a detailed process flow diagram of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following examples:
example 1:
(1) stirring and scrubbing quartz sand and fly ash with the granularity of 40-60 meshes according to the mass ratio of 0.5:1, stirring and scrubbing fly ash and water according to the mass ratio of 1:4, wherein the stirring speed is 300 r.min < -1 >, the stirring time is 30min, filtering and then repeatedly scrubbing are carried out for 2 times, scrubbing liquid returns to the previous stage for repeated use until the salt content in high-concentration salt-containing water obtained by the first stage of scrubbing reaches 20-30%, and the fly ash is separated from the quartz sand by a cyclone after the last stage of scrubbing and then returns to the process for continuous use;
(2) adjusting the pH value of the high-concentration salt water obtained in the step (1) to 5 by using hydrochloric acid, and performing evaporation concentration to obtain a potassium-sodium mixed salt and a residual calcium chloride saturated solution, wherein the content of calcium chloride in the potassium-sodium mixed salt is 6.15%, and the content of calcium chloride in the residual calcium chloride saturated solution is 89.17%;
(3) taking water-soluble amines prepared by taking octadecylamine as a main raw material as a collecting agent, taking carboxymethyl cellulose as an inhibitor, taking saturated potassium chloride and sodium chloride solution as a flotation medium, carrying out flotation separation on the potassium-sodium mixed salt obtained in the step (2), and filtering waste brine generated after flotation and returning the filtered waste brine to the flow for continuous use;
wherein the potassium chloride content in the separated potassium salt is 93.12%, and the recovery rate is 89.14%; the sodium chloride content in the sodium salt is 86.23 percent, and the recovery rate is 90.00 percent;
(4) respectively using potassium chloride saturated solution and sodium chloride saturated solution as washing solutions, respectively stirring and washing potassium chloride salt and sodium chloride salt obtained by flotation separation in the step (3), filtering to obtain industrial-grade potassium chloride and sodium chloride products, and mixing the washed potassium chloride and sodium chloride saturated solutions with each other to return to the process as flotation medium replenishing solution when the impurity content reaches a certain degree in the mixed solution of the potassium chloride and the sodium chloride;
the saturated brine for stirring and washing is 3 times of the impurity content, and the stirring and washing time is 30 min. After stirring and washing, the potassium chloride content in the sylvite is more than or equal to 95 percent, and the effective sodium chloride content in the sodium salt is more than or equal to 92 percent.
The above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (7)
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| CN201910941482.3A CN110589856A (en) | 2019-09-30 | 2019-09-30 | Method for recovering and separating potassium salt and sodium salt in waste incineration fly ash |
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| CN201910941482.3A CN110589856A (en) | 2019-09-30 | 2019-09-30 | Method for recovering and separating potassium salt and sodium salt in waste incineration fly ash |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112225242A (en) * | 2020-09-10 | 2021-01-15 | 杭州逐真科技有限公司 | Resourceful treatment device and process for mother liquor generated by reaction of waste incineration fly ash and hydrochloric acid |
| CN112374521A (en) * | 2020-11-13 | 2021-02-19 | 河北金坦化工装备有限公司 | Process for extracting calcium chloride from waste incineration fly ash |
| CN112391642A (en) * | 2020-10-16 | 2021-02-23 | 浙江中陶环保科技集团有限公司 | Method for preparing sodium hydroxide and potassium hydroxide by using municipal solid waste incineration fly ash |
| CN112479232A (en) * | 2020-12-16 | 2021-03-12 | 深圳清华大学研究院 | Floatation separation method for industrial by-product sodium chloride and sodium sulfate |
| CN112474707A (en) * | 2020-10-28 | 2021-03-12 | 宝武集团环境资源科技有限公司 | Efficient single-stage washing method and harmless treatment process for fly ash |
| CN112871961A (en) * | 2021-01-06 | 2021-06-01 | 宝武集团环境资源科技有限公司 | Detoxification method of municipal solid waste incineration fly ash |
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| CN112479232A (en) * | 2020-12-16 | 2021-03-12 | 深圳清华大学研究院 | Floatation separation method for industrial by-product sodium chloride and sodium sulfate |
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