WO2022141413A1 - 混酸废液处理系统 - Google Patents
混酸废液处理系统 Download PDFInfo
- Publication number
- WO2022141413A1 WO2022141413A1 PCT/CN2020/142189 CN2020142189W WO2022141413A1 WO 2022141413 A1 WO2022141413 A1 WO 2022141413A1 CN 2020142189 W CN2020142189 W CN 2020142189W WO 2022141413 A1 WO2022141413 A1 WO 2022141413A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mixed acid
- waste liquid
- acid waste
- sludge
- washing
- Prior art date
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- 239000002253 acid Substances 0.000 title claims abstract description 101
- 239000002699 waste material Substances 0.000 title claims abstract description 77
- 238000005406 washing Methods 0.000 claims abstract description 66
- 238000001914 filtration Methods 0.000 claims abstract description 47
- 230000009467 reduction Effects 0.000 claims abstract description 31
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 30
- 238000005189 flocculation Methods 0.000 claims abstract description 16
- 230000016615 flocculation Effects 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims description 95
- 239000010802 sludge Substances 0.000 claims description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000001514 detection method Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 23
- 239000003638 chemical reducing agent Substances 0.000 claims description 21
- 230000003472 neutralizing effect Effects 0.000 claims description 21
- 229910021645 metal ion Inorganic materials 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims description 16
- 239000010935 stainless steel Substances 0.000 claims description 16
- 230000007935 neutral effect Effects 0.000 claims description 14
- 238000005554 pickling Methods 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 239000000706 filtrate Substances 0.000 claims description 12
- 238000000746 purification Methods 0.000 claims description 12
- 229910001430 chromium ion Inorganic materials 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 8
- 239000002244 precipitate Substances 0.000 claims description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 6
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 239000008235 industrial water Substances 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 3
- -1 pyrosulfite Chemical compound 0.000 claims description 3
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 claims description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 230000008901 benefit Effects 0.000 description 9
- 239000008213 purified water Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000032258 transport Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000159 acid neutralizing agent Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- LQIIRBFXBIGGAZ-UHFFFAOYSA-L calcium;sodium;dihydroxide Chemical compound [OH-].[OH-].[Na+].[Ca+2] LQIIRBFXBIGGAZ-UHFFFAOYSA-L 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003311 flocculating effect Effects 0.000 description 2
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/26—Filters with built-in pumps filters provided with a pump mounted in or on the casing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
Definitions
- the invention relates to a treatment system, in particular to a mixed acid waste liquid treatment system.
- a layer of oxide skin composed of chromium, iron, nickel, silicon and other elements will be formed on the surface of the stainless steel strip during rolling or annealing. Acids are difficult to remove and are usually treated with mixed acids (nitric and hydrofluoric).
- the waste liquid after pickling contains residual nitric acid, hydrogen fluoride, oxides of chromium, iron, nickel, silicon and other elements and metal ions of metal elements.
- the production cost and maintenance cost of the spray roasting method are relatively high, which is suitable for large-scale enterprises, such as large-scale cold rolling plants that form a considerable amount of waste acid. Based on cost considerations, it is not suitable for small-scale enterprises. In particular, the cost performance is not high when the amount of waste acid is small.
- the resin exchange method has been applied in small cold rolling mills with a small amount of waste acid, but the total acid recovery rate is less than or equal to 45%, which is a low situation, which is likely to cause serious system blockage, and there is still a certain amount of mixed acid waste.
- the liquid is discharged into the water treatment station.
- the calcium hydroxide-sodium hydroxide neutralization method is widely used in the treatment of mixed acid waste liquid, but the operation cost is high when dealing with waste acid, and the recovery rate of waste acid is 0%, which cannot realize resource recovery and utilization.
- the specific operation of the sulfuric acid replacement method is as follows: first, the waste acid is filtered, added to the evaporator simultaneously with sulfuric acid in a certain proportion, heated and evaporated, and the evaporated gas is cooled to obtain regenerated acid; the crystallized liquid is cooled and added with sulfuric acid (concentrated) to increase the acidity rapidly. Crystallization and filtration to obtain water-containing ferrous sulfate, and the filtrate is then added to the evaporator in proportion for recycling.
- the above-mentioned sulfuric acid replacement method has high operation and maintenance costs, and puts forward requirements on production costs, resulting in less market application, low penetration rate, low practicability, low acid recovery rate, and serious system blockage.
- One advantage of the present invention is to provide a mixed acid waste liquid treatment system, wherein the mixed acid waste liquid treatment system improves the resource recovery rate.
- Another advantage of the present invention is to provide a mixed acid waste liquid treatment system, wherein the mixed acid waste liquid treatment system can effectively treat the acid-containing sludge in the stainless steel strip pickling system into neutral sludge, and solve the system blockage The problem.
- Another advantage of the present invention is to provide a mixed acid waste liquid treatment system, wherein the acid mixed waste liquid treatment system can effectively treat the acid-containing sludge in the stainless steel strip pickling system into neutral sludge, greatly reducing the The discharge of concentrated waste acid has low use cost and high cost performance, which is conducive to the sustainable development of the ecological environment and can be widely used.
- Another advantage of the present invention is to provide a mixed acid waste liquid treatment system, wherein the mixed acid waste liquid treatment system can directly process the sludge produced by filtration.
- Another advantage of the present invention is to provide a mixed acid waste liquid treatment system, wherein the mixed acid waste liquid treatment system can recover free acid to the pickling system for recycling.
- Another advantage of the present invention is to provide a mixed acid waste liquid treatment system, wherein the mixed acid waste liquid treatment system can reduce energy medium consumption.
- the present invention provides a mixed acid waste liquid treatment system, comprising:
- a filter device wherein the filter device includes a pump, and the filter device receives the mixed acid waste liquid and filters it to produce sludge;
- a washing device connected to the filtering device wherein the washing device delivers the washing liquid to the filtering device through the pump, the washing device comprises a washing tank containing the washing liquid, a washing liquid arranged in the a detection instrument of the washing tank and a washing pipeline connected to the washing tank and the filtering device, and the washing device washes the sludge through the washing liquid;
- a neutralizing device connected to the filtering device, wherein the neutralizing device delivers a neutralizing agent to the filtering device via the pump, the neutralizing device including a neutralizing device containing the neutralizing agent tank, a detection instrument provided in the neutralization tank, and a neutralization pipeline connected with the neutralization tank and the filter device, and the neutralizer adjusts the sludge to be neutral; and
- the flocculation device connected to the neutralization device, wherein the flocculation device delivers flocculant to the flocculation device through the pump, the flocculation device comprises a flocculant tank, a A detection instrument of the tank and a flocculation pipeline connected to the flocculant tank and the filter device.
- the pressing device further includes a pressing device connected to the filtration system, the pressing device includes a high-pressure pump, a water purification tank connected to the high-pressure pump, a detection device provided in the water purification tank meter and a pressing line connected to the water purification tank and the filter device.
- the filter device is any one of a filter press device and a centrifugal filter device.
- washing liquid is any one of industrial water, domestic water, desalinated water, and steam condensed water.
- washing liquid absorbs the free acid and metal ions of the sludge.
- the reducing agent is any one of sodium bisulfite, pyrosulfite, sodium sulfite and sodium hydrosulfite.
- the neutralizing agent is any one or a combination of both sodium hydroxide and calcium hydroxide.
- the flocculant is any one or a combination of polyaluminum chloride and polyacrylamide.
- the neutralizing agent further precipitates metal ions remaining after the sludge is washed.
- the filtering device filters the mixed acid waste liquid, a filtrate is generated, and the filtrate is recycled.
- the present invention further provides a method for treating mixed acid waste liquid, comprising the following steps:
- a flocculant is added to the sludge to precipitate metal ions of the sludge.
- step F pressing out the neutral water of the sludge layer to form a neutral mud cake with a moisture content below 60%.
- the step A includes a sub-step: after filtering the mixed acid waste liquid, a filtrate is generated, and the filtrate can be recycled.
- the step B includes a sub-step: absorbing the free acid and metal ions of the sludge into the washing liquid.
- the step C includes a sub-step: the reducing agent reduces the hexavalent chromium ions of the sludge to trivalent chromium ions.
- the step D includes a sub-step: precipitating residual metal ions after the sludge layer is washed.
- FIG. 1 is a schematic flow diagram of a mixed acid waste liquid treatment system according to an embodiment of the present invention.
- FIG. 2 is a flow chart of the steps of the mixed acid waste liquid treatment system according to the above-mentioned embodiment of the present invention.
- FIG. 1 it is a schematic flow diagram of a mixed acid waste liquid treatment system according to an embodiment of the present invention, which is used for processing mixed acid waste liquid.
- the mixed acid waste liquid treatment system 10 includes a filter device 11, a The washing device 12 of the filter device 11, a reduction device 13 connected to the filter device 11, a neutralization device 14 connected to the filter device 11, and a flocculation device 15 connected to the neutralization device 14, so
- the mixed acid waste liquid treatment system is used to process a stainless steel plate and belt mixed acid waste liquid, and the stainless steel plate and belt mixed acid waste liquid is transported to the filter device 11, and the filter device 11 receives the stainless steel plate and belt mixed acid waste liquid
- the filtering device 11 includes at least one pump, the washing device 12 sends the washing liquid (initially purified water) to the filtering device 11 through any one of the pumps, and the reducing device 13 passes through any one of the pumps.
- the pump transports the reducing agent to the filtering device 11 to reduce the harmful hexavalent chromium ions contained in the sludge layer to trivalent chromium ions.
- the flocculant is transported to the filtering device 11, and the flocculating device 15 transports the flocculant to the neutralization tank through any of the pumps, and utilizes the polymerization of the flocculant to more effectively precipitate metal ions.
- the filter device 11 is any one of a filter press device and a centrifugal filter device, and the mixed acid waste liquid is transported to the filter device 11 for filtration through the pump, and the filtrate generated by the filtration is refluxed and recycled. The resulting sludge is further processed by subsequent processes.
- the washing device 12 transports the washing liquid to the filtering device 11 through the pump, washes the sludge layer, and absorbs the free acid and metal ions in the sludge into the washing liquid.
- washing liquid is one of industrial water, domestic water, desalinated water, and steam condensed water.
- the washing liquid After the washing liquid reaches a certain concentration, it is recycled to the stainless steel strip pickling system for recycling, and the above-mentioned concentration is a saturated concentration, that is, the concentration of the washing liquid reaches the ion contained in the mixed acid waste liquid. Consistent concentration, that is, when the ions contained in the mixed acid waste liquid cannot be absorbed into the washing liquid.
- the washing device 12 includes a washing tank accommodating the washing liquid, a detection instrument disposed in the washing tank, and a washing pipeline connected to the washing tank and the filtering device 11 .
- the washing tank contains the washing liquid, and the pump is connected to the washing tank, through which the washing liquid passes from the washing tank through the washing line, and the washing liquid is conveyed to the washing tank.
- the filter device 11, the detection instrument is used to detect the operation status of the washing tank, and the detection instrument can realize the feedback of the operation status of the washing tank, so as to ensure the outside world's understanding of the operation program of the washing device 12. .
- washing liquid After the washing liquid reaches a certain concentration, it is sent to the stainless steel plate and belt mixed acid pickling system for recycling.
- the reducing device 13 sends the reducing agent to the filtering device 11 through the pump, and the reducing agent can reduce the harmful hexavalent chromium ions contained in the sludge layer to trivalent chromium ions.
- the reducing agent is any one of sodium bisulfite, pyrosulfite, sodium sulfite and sodium hydrosulfite.
- the reduction device 13 includes a reduction tank accommodating the reduction agent, a detection instrument arranged in the reduction tank, and a reduction pipeline connected to the reduction tank and the filter device 11,
- the reductant is contained in the reduction tank, the pump is connected to the reduction tank, and the reductant is transported from the reduction tank through the reduction line by the pump
- the detection instrument is used to detect the operation status of the reduction tank, and the detection instrument can realize feedback on the operation status of the reduction tank, so as to ensure the operation program of the reduction device 13 from the outside world. understanding.
- the neutralizing device 14 transports the neutralizing agent to the filtering device 11 through the pump, adjusts the sludge layer to be neutral, and also precipitates the residual metal ions after the sludge layer is washed. down.
- the neutralizing agent is any one or a combination of both sodium hydroxide and calcium hydroxide.
- the neutralization device 14 includes a neutralization tank accommodating the neutralization agent, a detection instrument arranged in the neutralization tank, and a detection instrument connected to the neutralization tank and the filter device 11 the neutralization pipeline, the neutralization agent is contained in the neutralization tank, the pump is connected to the neutralization tank, and the neutralization agent passes through the neutralization tank from the neutralization tank through the pump.
- the neutralizing pipeline the neutralizing agent is sent to the filtering device 11, and the detection instrument is used to detect the operation condition of the neutralization tank, and the detection instrument can realize the operation of the neutralization tank.
- the feedback of the situation ensures that the outside world has an understanding of the operation procedure of the neutralization device 14 .
- the flocculation device 15 transports the flocculant to the neutralization tank through the pump, and utilizes the polymerization of the flocculant to more effectively precipitate metal ions.
- the flocculant is any one or a combination of polyaluminum chloride and polyacrylamide.
- the flocculation device 15 includes a flocculant tank, a detection instrument arranged in the flocculant tank, and a flocculation pipeline connected to the flocculant tank and the filter device 11 .
- the flocculant is contained in the flocculant tank, the pump is connected to the flocculant tank, and the flocculant is transported from the flocculant tank through the flocculation pipeline through the pump
- the detection instrument is used to detect the operating condition of the flocculant tank.
- the mixed acid waste liquid treatment system 10 further includes a pressing device 16, the pressing device 16 includes a high-pressure pump, and the pressing device 16 transmits a purified water to the filter-pressing device 11 through the high-pressure pump In a diaphragm chamber, the neutral water in the sludge layer is pressed out by hydraulic pressure to obtain a neutral mud cake with a moisture content below 60%.
- the pressing device 16 also includes a water purification tank, a detection instrument arranged in the water purification tank, and a pressing pipeline connected to the water purification tank and the filter device 11 .
- the purified water is accommodated in the water purification tank, the pump is connected to the water purification tank, and the purified water is passed from the water purification tank through the pressing line by the pump, and the purified water is It is sent to the filtering device 11, and the detection instrument is used to detect the operation status of the water purification tank.
- the mixed acid waste liquid treatment system 10 continuously filters and separates the sludge produced by a stainless steel plate-belt mixed acid pickling system, thereby reducing the probability of blockage and damage of the pickling system equipment and pipes caused by the sludge, and improving the acidity of the acid. Washing efficiency and equipment pipeline life.
- the generated filtrate is returned to the stainless steel strip mixed acid pickling system for recycling, and the sludge generated after filtration is further processed by subsequent processes.
- the filtrate containing free acid after being filtered by the filtering device 11 is recycled to the stainless steel plate-belt mixed acid pickling system for recycling, so as to greatly save the consumption of new hydrogen fluoride and new nitric acid.
- the mixed acid waste liquid treatment system 10 of the embodiment of the present invention the quantity of free acid discharged to the downstream treatment system is reduced, and the production and maintenance costs are reduced.
- the acid-containing sludge produced by the filtering device 11 can be washed out of the effective free acid and metal ions contained in the sludge by the washing device 12, and after reaching a certain concentration, it is returned to the stainless steel plate with mixed acid.
- the washing system continues to recycle.
- washed sludge can continue to pass through the reduction device 13, the neutralization device 14, and the pressing device 16 to convert the free metal ions into precipitates, thereby producing the sludge with a water content below 60%. Neutral Mud Cake.
- the reducing device 13, the neutralizing device 14, and the flocculating device 15 all directly operate the sludge, thereby reducing the amount of the reducing agent, the neutralizing agent, and the flocculant. Reduce costs and contribute to sustainable development.
- the mixed acid waste liquid treatment system 10 of the present invention realizes the proper treatment of concentrated waste acid, has low use cost, high cost performance, and is conducive to the sustainable development of the ecological environment.
- Step A filter the mixed acid waste liquid
- Step B washing and filtering the sludge produced by the mixed acid waste liquid
- Step C adding a reducing agent to the sludge
- Step D adding a neutralizing agent to the sludge to adjust the sludge to be neutral;
- Step E adding a flocculant to the sludge to precipitate metal ions of the sludge.
- step F pressing out the neutral water of the sludge layer to form a neutral mud cake with a moisture content below 60%.
- the step A includes a sub-step: after filtering the mixed acid waste liquid, a filtrate is generated, and the filtrate can be recycled.
- the step B includes a sub-step: absorbing the free acid and metal ions of the sludge into the washing liquid.
- the step C includes a sub-step: the reducing agent reduces the hexavalent chromium ions of the sludge to trivalent chromium ions.
- the step D includes a sub-step: precipitating the residual metal ions after the sludge layer is washed.
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
本发明提供一种混酸废液处理系统，包括一个过滤装置、一个被连接至所述过滤装置的洗涤装置、一个被连接至所述过滤装置的还原装置、一个被连接至所述过滤装置的中和装置和一个被连接至所述中和装置的絮凝装置。
Description
本发明涉及一种处理系统，尤其涉及一种混酸废液处理系统。
冶金行业的不锈钢板带生产线废酸在处理过程中，不锈钢板带表面在轧制或退火过程中表面会生成一层由铬、铁、镍、硅等元素组成的氧化皮，这些氧化皮采用单一酸很难去除，通常采用混酸(硝酸及氢氟酸)进行处理。酸洗后的废液中含有残留的硝酸、氟化氢以及铬、铁、镍、硅等元素的氧化物和金属元素的金属离子。
针对不锈钢板带酸洗废液的特点，目前市场上有以下几种主流处理方式，包括喷雾焙烧法、树脂交换法、氢氧化钙-氢氧化钠中和法和硫酸置换法。其中，喷雾焙烧法所需生产成本和维护成本较高，适用于较大规模的企业，如，形成一定可观废酸量的规模化冷轧厂，基于成本的考量，并不适用于规模较小的企业，尤其，在废酸量较少时性价比不高。树脂交换法在小型的废酸量较少的冷轧厂得到了应用，但总酸回收率小于或等于45％，属于偏低的情况，容易导致系统堵塞较严重，且仍有一定量的混酸废液排入水处理站。氢氧化钙-氢氧化钠中和法在处理混酸废液方面应用广泛，但在处理废酸时运行成本较高，且废酸回收率为0％，无法实现资源回收利用。硫酸置换法的具体操作为，首先，废酸过滤，按一定比例与硫酸同时加入蒸发器，加热蒸发，蒸发出来的气体通过冷却得到再生酸；结晶液经冷却和加入硫酸(浓)提高酸度快速结晶过滤，得到含水硫酸亚铁，过滤液再按比例加入蒸发器循环处理。上述硫酸置换法的运行及维护费用较高，对生产成本提出了要求，导致市场应用较少，普及率不高，实用性不强，并且，酸回收率较低，系统堵塞严重。
发明内容
本发明的一个优势在于提供一种混酸废液处理系统，其中，所述混酸废液处理系统提升了资源回收利用率。
本发明的另一优势在于提供一种混酸废液处理系统，其中，所述混酸废液处理系统能有效的处理不锈钢板带酸洗系统中的含酸污泥成为中性污泥，解决系统堵塞的问题。
本发明的另一优势在于提供一种混酸废液处理系统，其中，所述混酸废液处理系统能有效的处理不锈钢板带酸洗系统中的含酸污泥成为中性污泥，大幅度减少浓废酸的排放，使用成本较低，性价比高，有利于生态环境的可持续发展，能够被广泛应用。
本发明的另一优势在于提供一种混酸废液处理系统，其中，所述混酸废液处理系统能直接对过滤产生的污泥进行处理。
本发明的另一优势在于提供一种混酸废液处理系统，其中，所述混酸废液处理系统能回收游离酸到酸洗系统进行循环利用。
本发明的另一优势在于提供一种混酸废液处理系统，其中，所述混酸废液处理系统能够减少能源介质消耗。
为实现上述目的，本发明提供一种混酸废液处理系统，包括：
一个过滤装置，其中所述过滤装置包括一个泵，所述过滤装置接收所述混酸废液并过滤，产生污泥；
一个被连接至所述过滤装置的洗涤装置，其中所述洗涤装置通过所述泵将洗涤液输送至所述过滤装置，所述洗涤装置包括一个容纳所述洗涤液的洗涤罐、一个被设于所述洗涤罐的检测仪表和一个被连通至所述洗涤罐和所述过滤装置的洗涤管路，所述洗涤装置通过所述洗涤液对所述污泥进行洗涤；
一个被连接至所述过滤装置的还原装置，其中所述还原装置通过所述泵将还原剂输送至所述过滤装置，所述还原装置包括一个容纳所述还原剂的还原罐、一个被设于所述还原罐的检测仪表和一个被连通于所述还原罐和所述过滤装置的还原管路，所述还原剂被作用于所述污泥；
一个被连接至所述过滤装置的中和装置，其中所述中和装置通过所述泵将中和剂输送至所述过滤装置，所述中和装置包括一个容纳所述中和剂的中 和罐、一个被设于所述中和罐的检测仪表和一个被连通于所述中和罐和所述过滤装置的中和管路，所述中和剂调节所述污泥为中性；和
一个被连接至所述中和装置的絮凝装置，其中所述絮凝装置通过所述泵将絮凝剂输送至所述絮凝装置，所述絮凝装置包括一个絮凝剂罐、一个被设于所述絮凝剂罐的检测仪表和一个被连通于所述絮凝剂罐和所述过滤装置的絮凝管路。
进一步的，进一步包括一个被连接至所述过滤系统的压榨装置，所述压榨装置包括一个高压泵、一个被连接至所述高压泵的净水罐、一个被设于所述净水罐的检测仪表和一个被连通于所述净水罐和所述过滤装置的压榨管路。
进一步的，所述过滤装置为压滤装置、离心过滤装置的任一。
进一步的，所述洗涤液为工业水、生活水、脱盐水、蒸汽冷凝水的任一。
进一步的，所述洗涤液吸收所述污泥的游离酸、金属离子。
进一步的，所述还原剂为亚硫酸氢钠、焦亚硫酸、亚硫酸钠、连二亚硫酸钠的任一。
进一步的，所述中和剂为氢氧化钠、氢氧化钙的任一或两种组合。
进一步的，所述絮凝剂为聚合氯化铝、聚丙烯酰胺的任一或两种组合。
进一步的，所述中和剂进一步沉淀所述污泥被洗涤后残留的金属离子。
进一步的，所述过滤装置过滤所述混酸废液后产生滤清液，所述滤清液被回收利用。
依本发明的另一方面，本发明进一步提供一种混酸废液处理方法，包括以下步骤：
A：过滤混酸废液；
B：洗涤过滤所述酸液产生的污泥；
C：向所述污泥中加入还原剂；
D：向所述污泥中加入中和剂，调节所述污泥为中性；和
E：向所述污泥中加入絮凝剂以沉淀所述污泥的金属离子。
根据本发明的一个实施例，进一步包括步骤F：压出所述污泥层的中性水，形成含水率在60％以下的中性泥饼。
根据本发明的一个实施例，所述步骤A包括子步骤：过滤所述混酸废液后产生滤清液，所述滤清液能够被回收利用。
根据本发明的一个实施例，所述步骤B包括子步骤：吸收所述污泥的游离酸、金属离子到洗涤液。
根据本发明的一个实施例，所述步骤C包括子步骤：所述还原剂还原所述污泥的六价铬离子为三价铬离子。
根据本发明的一个实施例，所述步骤D包括子步骤：沉淀污泥层洗涤后残留的金属离子。
本发明的其它优势和特点通过下述的详细说明得以充分体现并可通过所附权利要求中特地指出的手段和装置的组合得以实现。
通过对随后的描述和附图的理解，本发明进一步的目的和优势将得以充分体现。
本发明的这些和其它目的、特点和优势，通过下述的详细说明，附图和权利要求得以充分体现。
图1是根据本发明的一个实施例的混酸废液处理系统的流程示意图。
图2是根据本发明的上述实施例的混酸废液处理系统的步骤流程图。
以下描述用于揭露本发明以使本领域技术人员能够实现本发明。以下描述中的优选实施例只作为举例，本领域技术人员可以想到其他显而易见的变型。在以下描述中界定的本发明的基本原理可以应用于其他实施方案、变形方案、改进方案、等同方案以及没有背离本发明的精神和范围的其他技术方案。
本领域技术人员应理解的是，在本发明的揭露中，术语“纵向”、“横向”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系是基于附图所示的方位或位置关系，其仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此上述术语不能理解为对本发明的限制。
可以理解的是，术语“一”应理解为“至少一”或“一个或多个”，即在一个实施例中，一个元件的数量可以为一个，而在另外的实施例中，该元件的数量可以为多个，术语“一”不能理解为对数量的限制。
如图1所示，为本发明的一个实施例的混酸废液处理系统的流程示意图，用于处理混酸废液，所述混酸废液处理系统10包括一个过滤装置11、一个被连接至所述过滤装置11的洗涤装置12、一个被连接至该过滤装置11的还原装置13、一个被连接至该过滤装置11的中和装置14和一个被连接至该中和装置14的絮凝装置15，所述混酸废液处理系统被用于处理一种不锈钢板带混酸废液，所述不锈钢板带混酸废液被输送至所述过滤装置11，所述过滤装置11接收所述不锈钢板带混酸废液进行过滤，所述过滤装置11包括至少一个泵，所述的洗涤装置12通过任一所述泵将洗涤液(初始为净水)输送至所述过滤装置11，所述还原装置13通过任一所述泵将还原剂输送至所述过滤装置11，对污泥层中含有微量的有害六价铬离子还原为三价铬离子，所述中和装置14通过任一所述泵将中和剂输送至所述过滤装置11，所述的絮凝装置15通过任一所述泵将絮凝剂输送至所述中和罐，利用所述絮凝剂的聚合作用更有效的沉淀金属离子。
进一步的，所述过滤装置11为压滤装置、离心过滤装置的任一，通过所述泵将混酸废液输送至所述过滤装置11进行过滤，过滤产生的滤清液回流并循环利用，过滤后产生的污泥利用后续工序进一步处理。
进一步的，所述的洗涤装置12通过所述泵将所述洗涤液输送至所述过滤装置11，对污泥层进行洗涤，将污泥中的游离酸、金属离子吸收到洗涤液中。
进一步的，所述洗涤液为工业水、生活水、脱盐水、蒸汽冷凝水中的一种。
进一步的，所述洗涤液达到一定浓度后，被回收至所述不锈钢板带酸洗系统进行循环利用，上述浓度为饱和浓度，即所述洗涤液的浓度达到与所述混酸废液含有的离子一致的浓度，即在所述混酸废液含有的离子无法吸收到所述洗涤液里面时。
进一步的，所述洗涤装置12包括一个容纳所述洗涤液的洗涤罐、一个被设于所述洗涤罐的检测仪表和一个被连通至所述洗涤罐和所述过滤装置11的洗涤管路。所述洗涤罐容纳所述洗涤液，所述泵被连接至所述洗涤罐，通过所述泵，所述洗涤液自所述洗涤罐经过所述洗涤管路，所述洗涤液被输送至所述过滤装置11，所述检测仪表用于检测所述洗涤罐的运行状况，所述检测仪表能够实现对所述洗涤罐的运行状况的反馈，保障外界对所述洗涤装置12的运行程序的了解。
进一步的，所述洗涤液到达一定浓度后，被送至所述不锈钢板带混酸酸洗系统循环利用。
进一步的，所述还原装置13通过所述泵将所述还原剂输送至所述过滤装置11，所述还原剂能够对污泥层中含有微量的有害六价铬离子还原为三价铬离子。
进一步的，所述还原剂为亚硫酸氢钠、焦亚硫酸、亚硫酸钠、连二亚硫酸钠的任一。
进一步的，所述还原装置13包括一个容纳所述还原剂的还原罐、一个被设于所述还原罐的检测仪表和一个被连通于所述还原罐和所述过滤装置11的还原管路，所述还原剂被容纳于所述还原罐，所述泵被连接至所述还原罐，通过所述泵，所述还原剂自所述还原罐经过所述还原管路，所述还原剂被输送至所述过滤装置11，所述检测仪表用于检测所述还原罐的运行状况，所述检测仪表能够实现对所述还原罐的运行状况的反馈，保障外界对所述还原装置13的运行程序的了解。
进一步的，所述中和装置14通过所述泵将所述中和剂输送至所述过滤装置11，将污泥层调节为中性的同时，也将污泥层洗涤后残留的金属离子沉淀下来。
进一步的，所述中和剂为氢氧化钠、氢氧化钙的任一或两种组合。
进一步的，所述中和装置14包括一个容纳所述中和剂的中和罐、一个被设于所述中和罐的检测仪表和一个被连通于所述中和罐和所述过滤装置11的中和管路，所述中和剂被容纳于所述中和罐，所述泵被连接至所述中和罐，通过所述泵，所述中和剂自所述中和罐经过所述中和管路，所述中和剂被输送至所述过滤装置11，所述检测仪表用于检测所述中和罐的运行状况，所述检测仪表能够实现对所述中和罐的运行状况的反馈，保障外界对所述中和装置14的运行程序的了解。
进一步的，所述的絮凝装置15通过所述泵将所述絮凝剂输送至所述中和罐，利用所述絮凝剂的聚合作用更有效的沉淀金属离子。
进一步的，所述絮凝剂为聚合氯化铝、聚丙烯酰胺的任一或两种组合。
进一步的，所述絮凝装置15包括一个絮凝剂罐、一个被设于所述絮凝剂罐的检测仪表和一个被连通于所述絮凝剂罐和所述过滤装置11的絮凝管路，所述絮凝剂被容纳于所述絮凝剂罐，所述泵被连接至所述絮凝剂罐，通过所述泵，所述絮凝剂自所述絮凝剂罐经过所述絮凝管路，所述絮凝剂被输送至所述过滤装置11，所述检测仪表用于检测所述絮凝剂罐的运行状况。
进一步的，所述混酸废液处理系统10还包括一个压榨装置16，所述压榨装置16包括一个高压泵，所述压榨装置16通过所述高压泵将一个净水输送至所述压滤装置11的一个隔膜室，利用水压将污泥层中的中性水压出，得到含水率在60％以下的中性泥饼。
进一步的，所述压榨装置16还包括一个净水罐、一个被设于所述净水罐的检测仪表和一个被连通于所述净水罐和所述过滤装置11的压榨管路，所述净水被容纳于所述净水罐，所述泵被连接至所述净水罐，通过所述泵，所述净水自所述净水罐经过所述压榨管路，所述净水被输送至所述过滤装置11，所述检测仪表用于检测所述净水罐的运行状况。
进一步的，所述混酸废液处理系统10持续的将一个不锈钢板带混酸酸洗系统产生的污泥进行过滤分离，从而减少因污泥造成的酸洗系统设备、管道堵塞、损坏机率，提高酸洗效率及设备管道寿命。
进一步的，所述过滤装置11过滤所述混酸废液之后，产生的所述滤清液回流至所述不锈钢板带混酸酸洗系统循环利用，过滤后产生的污泥利用后续工序进一步处理。
进一步的，所述过滤装置11过滤后含游离酸的所述滤清液被回收到所述不锈钢板带混酸酸洗系统循环利用，实现大幅度的节省新氟化氢和新硝酸的耗量。
进一步的，通过本发明的所述实施例的所述混酸废液处理系统10，减少了游离酸的被排放至下游处理系统的数量，降低了生产和维护费用。
进一步的，所述过滤装置11产出的含酸污泥可以通过所述洗涤装置12将污泥中含有的有效游离酸和金属离子洗涤出来，达到一定浓度后，返回所述不锈钢板带混酸酸洗系统继续循环利用。
进一步的，洗涤后的污泥可以继续通过所述还原装置13、所述中和装置14、所述压榨装置16，将游离的金属离子转化为沉淀物，从而产出含水率在60％以下的中性泥饼。
进一步的，所述还原装置13、所述中和装置14、所述絮凝装置15均直接对污泥进行操作，从而减少了所述还原剂、所述中和剂、所述絮凝剂的用量，降低成本，有益于可持续发展。
进一步的，本发明的所述混酸废液处理系统10实现了妥善处理浓废酸，使用成本较低，性价比高，有利于生态环境的可持续发展。
参考附图2，为根据本发明的上述实施例的混酸废液处理系统的步骤流程图，其中所述混酸废液处理系统处理混酸废液的步骤如下：
步骤A：过滤所述混酸废液；
步骤B：洗涤过滤所述混酸废液产生的所述污泥；
步骤C：向所述污泥中加入还原剂；
步骤D：向所述污泥中加入中和剂，调节所述污泥为中性；和
步骤E：向所述污泥中加入絮凝剂以沉淀所述污泥的金属离子。
进一步的，包括步骤F：压出所述污泥层的中性水，形成含水率在60％以下的中性泥饼。
所述步骤A包括子步骤：过滤所述混酸废液后产生滤清液，所述滤清液能够被回收利用。
所述步骤B包括子步骤：吸收所述污泥的游离酸、金属离子到洗涤液。
所述步骤C包括子步骤：所述还原剂还原所述污泥的六价铬离子为三价铬离子。
所述步骤D包括子步骤：沉淀污泥层洗涤后残留的金属离子。
本领域的技术人员应理解，上述描述及附图中所示的本发明的实施例只作为举例而并不限制本发明。本发明的目的已经完整并有效地实现。本发明的功能及结构原理已在实施例中展示和说明，在没有背离所述原理下，本发明的实施方式可以有任何变形或修改。
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- 一种混酸废液处理系统，其特征在于，包括：一个过滤装置，其中所述过滤装置包括至少一个泵，所述过滤装置接收所述混酸废液并过滤，产生污泥；一个被连接至所述过滤装置的洗涤装置，其中所述洗涤装置通过任一所述泵将洗涤液输送至所述过滤装置，所述洗涤装置包括一个容纳所述洗涤液的洗涤罐、一个被设于所述洗涤罐的检测仪表和一个被连通至所述洗涤罐和所述过滤装置的洗涤管路，所述洗涤装置通过所述洗涤液对所述污泥进行洗涤；一个被连接至所述过滤装置的还原装置，其中所述还原装置通过任一所述泵将还原剂输送至所述过滤装置，所述还原装置包括一个容纳所述还原剂的还原罐、一个被设于所述还原罐的检测仪表和一个被连通于所述还原罐和所述过滤装置的还原管路，所述还原剂被作用于所述污泥；一个被连接至所述过滤装置的中和装置，其中所述中和装置通过任一所述泵将中和剂输送至所述过滤装置，所述中和装置包括一个容纳所述中和剂的中和罐、一个被设于所述中和罐的检测仪表和一个被连通于所述中和罐和所述过滤装置的中和管路，所述中和剂调节所述污泥为中性；和一个被连接至所述中和装置的絮凝装置，其中所述絮凝装置通过任一所述泵将絮凝剂输送至所述絮凝装置，所述絮凝装置包括一个絮凝剂罐、一个被设于所述絮凝剂罐的检测仪表和一个被连通于所述絮凝剂罐和所述过滤装置的絮凝管路。
- 根据权利要求1所述的混酸废液处理系统，其特征在于，进一步包括一个被连接至所述过滤系统的压榨装置，所述压榨装置包括一个高压泵、一个被连接至所述高压泵的净水罐、一个被设于所述净水罐的检测仪表和一个被连通于所述净水罐和所述过滤装置的压榨管路。
- 根据权利要求1所述的混酸废液处理系统，其特征在于，所述过滤装置为压滤装置、离心过滤装置的任一。
- 根据权利要求1所述的混酸废液处理系统，其特征在于，所述洗涤液为工业水、生活水、脱盐水、蒸汽冷凝水的任一。
- 根据权利要求4所述的混酸废液处理系统，其特征在于，所述洗涤液吸收所述污泥的游离酸、金属离子。
- 根据权利要求1所述的混酸废液处理系统，其特征在于，所述还原剂为亚硫酸氢钠、焦亚硫酸、亚硫酸钠、连二亚硫酸钠的任一。
- 根据权利要求1所述的混酸废液处理系统，其特征在于，所述中和剂为氢氧化钠、氢氧化钙的任一或两种组合。
- 根据权利要求1所述的混酸废液处理系统，其特征在于，所述絮凝剂为聚合氯化铝、聚丙烯酰胺的任一或两种组合。
- 根据权利要求1所述的混酸废液处理系统，其特征在于，所述中和剂进一步沉淀所述污泥被洗涤后残留的金属离子。
- 根据权利要求1所述的混酸废液处理系统，其特征在于，所述过滤装置过滤所述混酸废液后产生滤清液，所述滤清液被回收至一个不锈钢板带酸洗系统循环利用。
- 根据权利要求1所述的混酸废液处理系统，其特征在于，所述洗涤液被回收到所述不锈钢板带酸洗系统循环利用。
- 一种混酸废液处理方法，其特征在于，包括以下步骤：A：过滤所述混酸废液；B：洗涤过滤所述混酸废液产生的所述污泥；C：向所述污泥中加入还原剂；D：向所述污泥中加入中和剂，调节所述污泥为中性；和E：向所述污泥中加入絮凝剂以沉淀所述污泥的金属离子。
- 根据权利要求12所述的混酸废液处理方法，其特征在于，进一步包括步骤F：压出所述污泥层的中性水，形成含水率在60％以下的中性泥饼。
- 根据权利要求12所述的混酸废液处理方法，其特征在于，所述步骤A包括子步骤：过滤所述混酸废液后产生滤清液，所述滤清液能够被回收利用。
- 根据权利要求12所述的混酸废液处理方法，其特征在于，所述步骤B包括子步骤：洗涤所述污泥时，吸收所述污泥的游离酸、金属离子。
- 根据权利要求12所述的混酸废液处理方法，其特征在于，所述步骤C包括子步骤：所述还原剂还原所述污泥的六价铬离子为三价铬离子。
- 根据权利要求12所述的混酸废液处理方法，其特征在于，所述步骤D包括子步骤：沉淀污泥层洗涤后残留的金属离子。
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