CN85107864A - The Pollution abatement of sulfur-containing wasting alkali and utilization - Google Patents
The Pollution abatement of sulfur-containing wasting alkali and utilization Download PDFInfo
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- CN85107864A CN85107864A CN 85107864 CN85107864A CN85107864A CN 85107864 A CN85107864 A CN 85107864A CN 85107864 CN85107864 CN 85107864 CN 85107864 A CN85107864 A CN 85107864A CN 85107864 A CN85107864 A CN 85107864A
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- sulfur
- gas
- alkali
- sodiumnitrate
- pollution abatement
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Abstract
The invention belongs to environment protection and chemical industry technology.
The present invention is mainly used in the Pollution abatement and the comprehensive utilization of sulfur-containing waste lye (or slag).
Technical characterictic of the present invention is: use the nitric acid treatment salkali waste, form liquids and gases two portions.Recovery sulphur and SODIUMNITRATE from liquid.Gas absorbs with alkali, then therefrom recovery sulphur, Sodium Nitrite and yellow soda ash or the former two.
Description
The invention belongs to environmental protection technology and chemical industry technology.
In the industry such as chemical industry, oil and coal processing, the process of sulfurous gas desulfurization is arranged all.With the sodium hydroxide solution washing is one of sulfur method of using always.When making in this way, in the waste lye or alkaline residue that is produced, contain materials such as sodium sulphite, yellow soda ash, sodium hydroxide and organosulfur, the composition complexity, seriously polluted.For example: China does not all address this problem well from a few cover ethylene units of external introduction.The station-service dioxy carbon that has is handled, and the hydrogen sulfide that generates is discharged into torch burns, with alkaliferous discharge of wastewater.So not only do not obtain product, and form serious secondary pollution.The station-service vitriolization that has is sent to boiler with the hydrogen sulfide that generates and makes fuel, though obtain some sodium salt products, still exists sulfurous gas to atmospheric pollution.The factory that abroad has with waste lye with atmospheric oxidation after discharge into sea, though eliminated the pollution of sulphur, do not have economic benefit.
The objective of the invention is: the first, utterly destroy pollution (no waste gas, no waste residue, the water that only steams that will discharge); The second, the pollutent in waste lye or the alkaline residue all is recycled into commodity short on the domestic market; The 3rd, when administering pollution, obtain big economic benefit.
Technical characterictic of the present invention is: with nitric acid treatment waste lye or alkaline residue, make it to form liquids and gases two partly.Mainly contain SODIUMNITRATE and sulphur in the liquid, through Separation and Recovery sulphur, again with solution concentration, crystallisation by cooling, Separation and Recovery SODIUMNITRATE.Contain nitrogen oxide, hydrogen sulfide and carbonic acid gas in the gas.With absorption liquid (with waste lye, alkaline residue add solution, sodium sulfide solution or milk of lime that water is made into all can) absorb this gas, generate the mixture that contains Sodium Nitrite (or calcium), yellow soda ash (or calcium), sulphur and water.Elder generation's Separation and Recovery sulphur separates (concentrating earlier in case of necessity) again and reclaims yellow soda ash (or calcium), at last again with solution concentration, crystallisation by cooling, Separation and Recovery Sodium Nitrite (or calcium).
Example: the desulfurization spent lye treatment method of ethylene unit is as follows:
(1) acidifying: waste lye is mixed with nitric acid, make it to generate the mixed solution of SODIUMNITRATE, sulphur and water, emit the mixed gas that contains nitrogen oxide, hydrogen sulfide and carbonic acid gas simultaneously.
(2) reclaim sulphur: from acidifying gained liquid, isolate sulphur (available filtration method or heating top and bottom process), as product.
(3) reclaim SODIUMNITRATE: will arrive 110-125 ℃ except that the liquid concentration of desulfuration, crystallisation by cooling is promptly separated out SODIUMNITRATE.Isolate crystallization, according to analytical results, packing or recrystallization once promptly get the SODIUMNITRATE product immediately.Recycling Mother Solution last during separation is used, and returns to concentrate or acidization.
(4) absorb: absorb the gas that acidization is emitted with another strand waste lye, generate the mixture that Sodium Nitrite, yellow soda ash and sulphur are equal to water.Unabsorbed a small amount of gas is stored in the gas holder, recycles after oxidation, so that all absorb.
The terminal point of absorption process, control weakly alkaline to slightly acidic is as the criterion, preferably PH=7-8.Normal pressure or pressurizing absorption all can.
(5) reclaim sulphur: method is identical with (2).
(6) separate alkali: will be except that the solution concentration of desulfuration, until there being quite a lot of crystallize sodium carbonate to occur.Filter to isolate crystallization, and, promptly obtain yellow soda ash with the less water washing.Can regard product, also can with in the nitric acid and after, incorporate the concentration process of (3) into.
(7) reclaim Sodium Nitrite: will separate filter, washing lotion crystallisation by cooling behind the alkali, and isolate crystallization again, and promptly obtain the nitrous acid product.Mother liquor returns the concentration process that separates alkali and recycles.Contain a small amount of SODIUMNITRATE in this kind Sodium Nitrite, can be directly use, also can recrystallization purify or be used to produce saltpetre and commercially pure Sodium Nitrite as concrete early strength agent.
As doing absorption liquid with milk of lime, then recyclable SODIUMNITRATE, sulphur, calcium nitrite and lime carbonate.
As replacing waste lye with Gas with Sodium Sulfide Solution, use the present invention, promptly be chemical process with sodium sulfate and nitric acid production SODIUMNITRATE and Sodium Nitrite.
Claims (1)
1, the present invention is used for the Pollution abatement and the comprehensive utilization of sulfur-containing wasting alkali.Its characteristics are:
A. use the reactant aqueous solution of the nitric acid gas of nitrogen peroxide (or contain) and sulfur-containing wasting alkali, make material be divided into solution and gas two portions.
B. from solution, reclaim sulphur, SODIUMNITRATE, Sodium Nitrite and yellow soda ash (or former three) through processes such as concentrated, crystallisation by cooling, separation.
C. contain nitrogen protoxide in the gas, after oxidation, recycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85107864 CN85107864A (en) | 1985-10-25 | 1985-10-25 | The Pollution abatement of sulfur-containing wasting alkali and utilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85107864 CN85107864A (en) | 1985-10-25 | 1985-10-25 | The Pollution abatement of sulfur-containing wasting alkali and utilization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85107864A true CN85107864A (en) | 1987-05-06 |
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ID=4795812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85107864 Pending CN85107864A (en) | 1985-10-25 | 1985-10-25 | The Pollution abatement of sulfur-containing wasting alkali and utilization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85107864A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671087B (en) * | 2009-09-11 | 2011-06-15 | 广东光华科技股份有限公司 | Method for recovering reagent grade sodium nitrate from waste liquid of bismuth subnitrate production |
| CN104249065A (en) * | 2013-06-26 | 2014-12-31 | 浙江昱辉阳光能源有限公司 | Cleaning method of silicon material waste gas absorption tower |
| CN108251124A (en) * | 2018-03-14 | 2018-07-06 | 天津立昌科技有限公司 | The modification method of alkaline land modifying agent and alkaline land soil |
| CN113173662A (en) * | 2021-06-04 | 2021-07-27 | 杭州兴洋环保科技有限公司 | Acid mist tower wastewater treatment method and system |
-
1985
- 1985-10-25 CN CN 85107864 patent/CN85107864A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671087B (en) * | 2009-09-11 | 2011-06-15 | 广东光华科技股份有限公司 | Method for recovering reagent grade sodium nitrate from waste liquid of bismuth subnitrate production |
| CN104249065A (en) * | 2013-06-26 | 2014-12-31 | 浙江昱辉阳光能源有限公司 | Cleaning method of silicon material waste gas absorption tower |
| CN104249065B (en) * | 2013-06-26 | 2016-12-28 | 浙江昱辉阳光能源有限公司 | A kind of cleaning method of silicon material waste gas absorption tower |
| CN108251124A (en) * | 2018-03-14 | 2018-07-06 | 天津立昌科技有限公司 | The modification method of alkaline land modifying agent and alkaline land soil |
| CN108251124B (en) * | 2018-03-14 | 2021-04-23 | 上海立昌环境科技股份有限公司 | Saline-alkali soil conditioner and saline-alkali soil improvement method |
| CN113173662A (en) * | 2021-06-04 | 2021-07-27 | 杭州兴洋环保科技有限公司 | Acid mist tower wastewater treatment method and system |
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| WD01 | Invention patent application deemed withdrawn after publication |