CN1248973C - Utilizing method for waste sulfuric radical - Google Patents
Utilizing method for waste sulfuric radical Download PDFInfo
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- CN1248973C CN1248973C CN 03111227 CN03111227A CN1248973C CN 1248973 C CN1248973 C CN 1248973C CN 03111227 CN03111227 CN 03111227 CN 03111227 A CN03111227 A CN 03111227A CN 1248973 C CN1248973 C CN 1248973C
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Abstract
The present invention provides a use method for discarded sulphuric acid radicals. Waste water containing sulphuric acid radicals is led into a pretreatment pool, a sodium hydroxide solution is added into the pretreatment pool, and a pH value is regulated to be greater than 13; the waste water and the sodium hydroxide solution are sufficiently stirred, and sediment is filtered; a filtered solution is led into a reactor, and the water solution of calcium hydroxide is added into the reactor; after reaction is finished, solid and liquid separation is carried out, and hydrous calcium sulphate is obtained; reaction liquid flows back to the pretreatment pool. The present invention has the advantages of little raw material consumption, low operation cost, good waste water purification effect, no secondary pollution, etc.
Description
(1), affiliated field
What the present invention relates to is a kind of treatment process of sewage.The present invention also relates to a kind of method of comprehensive utilization of waste.
(2), background technology
In many industrial production such as store battery manufacturing, plating, can produce a large amount of sulfuric acid or the acid waste of vitriol.Because the severe corrosive of acid is very big to environmental influence,, but allow the neutral discharging of salt so discarded acid and discarded salt are not allow directly discharging.At present, produce the enterprise of discarded acid and the discarded salt of solubility, all use sodium hydroxide to carry out neutralizing treatment, make it to reach neutral and discharging afterwards discarding sour and discarded salt.To the pollution survey analysis in most of regional rivers and lakes and shoreline, pollution situation is still quite serious.Trace it to its cause, except that the pollution that has the part discharge in violation of regulations to bring, the environmental pollution that the neutral salt discharging brings also can not be ignored.After the neutral discharging of the discarded acid treatment of solubility, variation because of factors such as the temperature of liquid in the discharge process, concentration, hydrolysising balance is with destroyed, and the reasons such as other pollutent generation chemical reaction in discharging back and the basin, and the vitriol of neutral discharging also can pollute.The water that exceeds standard of saltiness is used for agricultural irrigation in addition, soil compaction will occur, influence hazardness disasters such as crop growth.In fact, will discard the discarded salt of acid and solubility and handle the neutral discharging in back, just reduce pollution level, slowly-releasing the generation of polluting, fundamentally eliminate because of discarded acid and soluble salt and discharge the environmental pollution that brings.Adopt sodium hydroxide neutral treatment process cost higher in addition.
(3), summary of the invention
The object of the present invention is to provide a kind of pollution that can eliminate waste sulfate and waste sulfate salt pair environment, and can access valuable industrial chemicals the waste sulfate root utilize method.
The object of the present invention is achieved like this: the waste water that will contain sulfate radical is introduced pretreatment pool, adds sodium hydroxide solution in pretreatment pool, and adjust pH is greater than 13; Fully stir the filtering throw out; Filtrate is introduced in the reactor, adds calcium hydroxide aqueous solution in reactor; Reaction is carried out solid-liquid separation after finishing, and obtains containing the calcium sulfate and the reaction solution of crystal water, and reaction solution is back to pretreatment pool.The present invention can also comprise: gypsum is made in the calcium sulfate calcining that 1, will contain crystal water, again gypsum is made gypsum brick, be built into one group of absorption tower with gypsum brick, partial reaction liquid is introduced an absorption tower, treat that this absorption tower suctions after the reaction solution, introduces next absorption tower again, suction absorption tower seasoning in air of reaction solution, with the crystallization in the reaction solution flushing gypsum brick, wash-down water is back to pretreatment pool behind the evaporation moisture wherein, and the absorption tower enters next again and absorbs operation.2, used calcium hydroxide with partial reaction liquid and lime reaction, generates the mixed solution that contains calcium hydroxide and adds in the reactor with lime system in the reaction.
The invention has the advantages that: adopting calcium hydroxide is that raw material is handled the waste water that contains sulfuric acid or contain vitriol, calcium hydroxide can add water with the lime of cheapness and obtain, sodium hydroxide wherein is just as the middle transition material, in the full cycle process, recycle, do not consume basically.The price of lime is about 1/20 of a sodium hydroxide.Therefore the bright method of we can make the processing cost of sewage reduce greatly.The calcium sulfate that the present invention obtained has higher purity, can directly use as industrial chemicals after the drying, can further be processed into gypsum again.Method of the present invention adopts sodium hydroxide to carry out pre-treatment, the sulfuric acid that contains in the waste liquid, the metabisulfite solution that the sulfate ion in the vitriol changes into solubility both can have been made, can make the most of heavy metal ion that contain in the waste liquid again, formation is insoluble in the oxyhydroxide of water, be removed after filtration, can prevent the pollution of heavy metal ion discharging back contained in the waste water effectively environment.Method of the present invention has changed into calcium sulfate, the gypsum of higher degree with cheap lime in operational process, except that the starting stage need add the part sodium hydroxide, do not have other consumption basically.Raw materials consumption is few, working cost is low so the present invention has, to advantages such as the good purification of waste water, non-secondary pollutions.
(4), description of drawings
Accompanying drawing is a process flow diagram of the present invention.
(5), specific embodiments
For example the present invention is done in more detail below and describes:
Embodiment 1.In conjunction with the accompanying drawings, the waste water that will contain sulfuric acid or vitriol is introduced pretreatment pool 1, adds sodium hydroxide solution in pretreatment pool, and adjust pH is greater than 13; Under the effect of agitator 2, fully stir, the sulfuric acid conversion in the waste water is become metabisulfite solution, and make the heavy metal ion that may contain in the waste water form precipitation of hydroxide; The filtering throw out; Filtrate is introduced in the hold-up vessel 3, introduce again in the rotary type reactor 4, in reactor, add calcium hydroxide aqueous solution, reacted 5-15 minute; Reaction is introduced belt centrifuge separator 5 with product after finishing, and carries out solid-liquid separation under suction function, obtains containing the calcium sulfate and the reaction solution of crystal water, and reaction solution enters pond for recovering 6.
Embodiment 2.Used calcium hydroxide adopts lime to produce in the treating processes, and partial reaction liquid and lime reaction with in the pond for recovering make calcium hydroxide.
Embodiment 3.The major ingredient of reaction solution is a sodium hydroxide, solid substance after the filtration can obtain more purified calcium sulfate by convection drying, gypsum is made in the calcium sulfate calcining that perhaps will contain crystal water, again gypsum is made gypsum brick, be built into one group of absorption tower with gypsum brick, reaction solution in the pond for recovering is introduced an absorption tower, treat that the absorption tower suctions after the reaction solution, change reaction solution over to next absorption tower, suction absorption tower seasoning in air of reaction solution, with the crystallization in the reaction solution flushing gypsum brick, wash-down water is back to pretreatment pool behind the evaporation moisture wherein, and the absorption tower enters next again and absorbs operation.Absorbed the absorption tower of liquid, evaporated moisture after, in gypsum, formed the sodium hydroxide crystallization, with the crystallization of reaction solution flush of hydrogen sodium oxide be dissolved in the flushing reaction solution in.Therefore make the concentration sodium hydroxide in the reaction solution that is back in the pretreatment pool higher, reduce the consumption of sodium hydroxide, even do not need hydrogen make-up sodium oxide once more.Redundant moisture has adopted the mode of spontaneous evaporation to handle in the circulation, has realized the zero release of waste water, has eliminated the pollution of discharge of wastewater to water system.
Claims (3)
1, a kind of waste sulfate root utilize method, it is characterized in that: the waste water that will contain sulfate radical is introduced pretreatment pool, adds sodium hydroxide solution in pretreatment pool, and adjust pH is greater than 13; Fully stir the filtering throw out; Filtrate is introduced in the reactor, adds calcium hydroxide aqueous solution in reactor; Reaction is carried out solid-liquid separation after finishing, and obtains containing the calcium sulfate and the reaction solution of crystal water, and reaction solution is back to pretreatment pool.
2, waste sulfate root according to claim 1 utilizes method, it is characterized in that: gypsum is made in the calcium sulfate calcining that will contain crystal water, again gypsum is made gypsum brick, be built into one group of absorption tower with gypsum brick, partial reaction liquid is introduced an absorption tower, treat that this absorption tower suctions after the reaction solution, introduce next absorption tower again, suction absorption tower seasoning in air of reaction solution, behind wherein the moisture of evaporation with the crystallization in the reaction solution flushing gypsum brick, wash-down water is back to pretreatment pool, and the absorption tower enters next again and absorbs operation.
3, waste sulfate root according to claim 1 and 2 utilize method, it is characterized in that: used calcium hydroxide with partial reaction liquid and lime reaction, generates the mixed solution that contains calcium hydroxide and adds in the reactor with lime system in the reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03111227 CN1248973C (en) | 2003-03-18 | 2003-03-18 | Utilizing method for waste sulfuric radical |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03111227 CN1248973C (en) | 2003-03-18 | 2003-03-18 | Utilizing method for waste sulfuric radical |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1532149A CN1532149A (en) | 2004-09-29 |
| CN1248973C true CN1248973C (en) | 2006-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03111227 Expired - Fee Related CN1248973C (en) | 2003-03-18 | 2003-03-18 | Utilizing method for waste sulfuric radical |
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| Country | Link |
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| CN (1) | CN1248973C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823750A (en) * | 2010-04-30 | 2010-09-08 | 汪晋强 | Method for co-production of raw gypsum in preparation of Yengsu calcium chloride dihydrate by phosphogypsum |
| CN102225818B (en) * | 2011-04-15 | 2012-12-12 | 四川省环保科技工程有限责任公司 | Technological process for toxicity elimination of extracted wastewater with high concentrated acid |
| CN103011757A (en) * | 2012-11-27 | 2013-04-03 | 常州大学 | Treatment method for sulfur-containing wastewater |
| CN103819027A (en) * | 2014-03-13 | 2014-05-28 | 安徽天意环保科技有限公司 | Joint treatment method for various types of sewage |
| CN104192971A (en) * | 2014-08-29 | 2014-12-10 | 中国科学院过程工程研究所 | Method for treating industrial wastewater containing sulfuric acid |
| CN104528898B (en) * | 2014-12-16 | 2017-03-29 | 湖北万润新能源科技发展有限公司 | The recovery method of high concentration nitrogen phosphate and sulfur waste water resource |
| CN112723468A (en) * | 2020-12-24 | 2021-04-30 | 锦西化工研究院有限公司 | Method for reducing sulfate radical concentration in polysulfide sewage |
| CN113698038A (en) * | 2021-09-01 | 2021-11-26 | 山东凯翔生物科技股份有限公司 | Utilization and treatment method of gluconolactone high-salt ion exchange wastewater |
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2003
- 2003-03-18 CN CN 03111227 patent/CN1248973C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1532149A (en) | 2004-09-29 |
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