CN1180995C - Method for treating high-concentration sulfur dioxide waste liquid - Google Patents
Method for treating high-concentration sulfur dioxide waste liquid Download PDFInfo
- Publication number
- CN1180995C CN1180995C CNB031265944A CN03126594A CN1180995C CN 1180995 C CN1180995 C CN 1180995C CN B031265944 A CNB031265944 A CN B031265944A CN 03126594 A CN03126594 A CN 03126594A CN 1180995 C CN1180995 C CN 1180995C
- Authority
- CN
- China
- Prior art keywords
- waste liquid
- sulfur dioxide
- powder
- concentration sulfur
- calcium sulfate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The present invention discloses a method for treating high-concentration sulfur dioxide waste liquid. The aim of the present invention is to provide a treating method which can ensure that the high-concentration sulfur dioxide waste liquid and marble or limestone can moderately and completely react without discharging sulfur dioxide gas to environment or causing secondary pollution and the reaction residue can be converted into gypsum. The present invention comprises: the marble or the limestone is pulverized into more than 200 mesh of powder, and the powder and water are mixed into material slurry in a proportion of 1 to 5. The waste liquid is injected into a reaction tank by a plurality of holes on the bottom of the reaction tank according to the weight ratio of the powder to the waste liquid of 1 to 1 along with agitation. When the pH value is reduced to about 6.4 in the reaction process, the air is filled, and then, calcium sulfite is oxidized into calcium sulfate. Subsequently, the suspending liquid is centrifugally separated to obtain hydrous calcium sulfate. Finally, the hydrous calcium sulfate is roasted to manufacture the gypsum.
Description
Technical Field
The invention relates to an industrial wastewater treatment technology, in particular to a method for treating high-concentration sulfur dioxide waste liquid.
Background
Industrially, the high-concentration sulfur dioxide waste liquid comes from the washing purification of raw material gas sulfur dioxide; at present, a stripping tower is mostly adopted for treating the waste water at home and abroad, sulfur dioxide is recycled, and the rest sewage is sent to a sewage treatment plant for treatment or retreatment. The mode has large investment and high energy consumption, and is difficult to bear by common medium and small-sized production plants. Therefore, some domestic medium and small-sized manufacturers often directly discharge the high-concentration sulfur dioxide waste liquid into rivers, lakes and seas without treatment, thereby causing serious pollution to the environment. The high-concentration sulfur dioxide waste liquid is a strong acid concentrated solution, and can cause serious secondary pollution by directly reacting with an alkali sodium hydroxide solution or lime water, on one hand, the reaction is too violent and is difficult to control, and a large amount of heat needs to be released; on the other hand, the high-concentration sulfur dioxide waste liquid is unstable and is heated to volatilize a large amount of sulfur dioxidewaste liquid into the air. If the high-concentration sulfur dioxide waste liquid is directly reacted with the granular marble or limestone, the reaction is difficult to be completed, the utilization rate of raw materials is not high, and a large amount of sulfur dioxide gas is still discharged, so that serious secondary pollution is caused.
Disclosure of Invention
The invention aims to provide a method for reacting high-concentration sulfur dioxide waste liquid with marble or limestone mildly and completely; no sulfur dioxide gas is discharged to the environment, no secondary pollution is caused, and the waste residue can be converted into gypsum.
The purpose of the invention is realized by the following technical scheme.
The method for treating the high-concentration sulfur dioxide waste liquid sequentially comprises the following steps of:
(a) pulverizing one of marble or limestone into powder with more than 200 meshes;
(b) preparing the powder and water into slurry in a reaction tank according to the weight ratio of 1: 5;
(c) injecting high-concentration sulfur dioxide waste liquid from the middle lower part of the reaction tank by using a plurality of holes according to the weight ratio of 1: 1 of the powder to the waste liquid under stirring;
(d) after the waste liquid is added, continuously stirring and reacting until the pH value is changed to 6.4, and introducing air to oxidize the calcium sulfite into calcium sulfate;
(e) centrifuging to separate out the hydrous calcium sulfate product;
(f) calcining the product obtained in the step e to prepare gypsum.
The particle size of the powder of step (a) is 200 mesh.
The density of the high-concentration sulfur dioxide waste liquid in the step (c) is 1.56g/cm3-1.64g/cm3The stirring speed is 20-30 r/min, and the feeding speed of high-concentration sulfur dioxide is 0.5dm3/s。
The invention enables the high-concentration sulfur dioxide waste liquid and the marble or the limestone to react mildly and completely by improving the process conditions of the reaction of the sulfur dioxide and the marble or the limestone; sulfur dioxide gas is not discharged to the environment, secondary pollution is not caused, and waste residues of the waste residues can be converted into gypsum, so that the beneficial effects of reasonably utilizing resources and preventing pollution are achieved.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
In the figure: crusher 1 reaction tank 2 waste liquid feed pipe 3 centrifugal separator 4 roasting furnace 5
Detailed Description
The invention is further described below with reference to the accompanying drawings.
According to the process shown in FIG. 1, the specific example of the present invention uses marble with a calcium carbonate content of not less than 99%, and 1 ton of marble is pulverized in a pulverizer1, crushing into 200-mesh powder; 10M with about 5 tons of water3The reaction tank 2 is made into slurry with water; starting stirring, stirring at 25 rpm, injecting 1 ton of the waste liquid with a density of 1.61g/cm from a porous waste liquid feeding pipe 3 at the middle lower part of the reaction tank3The feeding speed of the high-concentration sulfur dioxide waste liquid is 0.5dm3S; after the addition is finished, continuously stirring and reacting for about 2 hours until the pH value is reduced to 6.4, and introducing air to oxidize the calcium sulfite into calcium sulfate; adding the suspension into a centrifugal separator 4, and centrifugally separating out hydrous calcium sulfate; the hydrous calcium sulfate is put into a roasting furnace 5 and roasted to prepare gypsum.
The method is characterized in that marble or limestone is used as a raw material to treat the high-concentration sulfur dioxide waste liquid, calcium carbonate in the marble or the limestone is used to react with the high-concentration sulfur dioxide to generate calcium sulfite, and carbon dioxide is released at the same time, wherein the reaction formula is as follows:
introducing air into the reaction tank, oxidizing the calcium sulfite into calcium sulfate by oxygen in the air, wherein the reaction formula is as follows:
the roasting removes part of crystal water of hydrous calcium sulfate to prepare gypsum, and the reaction formula is as follows:
it should be noted that, because marble or limestone powder with about 200 meshes is adopted, the particle size is large, the reaction is incomplete, the utilization rate of raw materials is low, and the purity of the generated calcium sulfate is low; too small a particle size makes centrifugal separation difficult and increases processing costs. If the density of the high-concentration sulfur dioxide wasteliquid is changed, the weight ratio of the marble or limestone can be properly adjusted according to the actual situation. A stirring device is added in the reaction tank, so that the sulfur dioxide waste liquid is fully contacted with the powder slurry, and the phenomenon that the local reaction is too fast and the temperature is too high, so that the unreacted sulfur dioxide is discharged in a gas form to cause secondary pollution is avoided. The stirring speed is preferably 20-30 rpm. Meanwhile, the stirring is also beneficial to the release of carbon dioxide, and the reaction time is shortened. High-concentration sulfur dioxide waste liquid is injected from the middle lower part of the reaction tank through a plurality of holes, so that the reaction can be fully carried out, and even a small amount of sulfur dioxide is discharged, the sulfur dioxide can be dissolved in water before rising to the surface of the reaction tank, and the air can be polluted. The flow of the sulfur dioxide waste liquid in the reaction tank is proper, so that the phenomenon that the partial reaction is too fast and the temperature is too high, and the unreacted sulfur dioxide is discharged in a gas form to cause secondary pollution is prevented.
Claims (3)
1. A method for treating high-concentration sulfur dioxide waste liquid sequentially comprises the following steps:
(a) pulverizing one of marble or limestone into powder with more than 200 meshes;
(b) preparing the powder and water into slurry in a reaction tank according to the weight ratio of 1: 5;
(c) injecting high-concentration sulfur dioxide waste liquid from the middle lower part of the reaction tank by using a plurality of holes according to the weight ratio of 1: 1 of the powder to the waste liquid under stirring;
(d) after the waste liquid is added, continuously stirring and reacting until the pH value is changed to 6.4, and introducing air to oxidize the calcium sulfite into calcium sulfate;
(e) centrifuging to separate out the hydrous calcium sulfate product;
(f) calcining the product obtained in step (e) to form gypsum.
2. The process of claim 1 wherein the powder of step (a) has a particle size of 200 mesh.
3. The treatment method according to claim 1 or 2, wherein the density of the high-concentration sulfur dioxide waste liquid in the step (c) is 1.56g/cm3-1.64g/cm3The stirring speed is 20-30 r/min, and the feeding speed of high-concentration sulfur dioxide is 0.5dm3/s。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031265944A CN1180995C (en) | 2003-05-16 | 2003-05-16 | Method for treating high-concentration sulfur dioxide waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031265944A CN1180995C (en) | 2003-05-16 | 2003-05-16 | Method for treating high-concentration sulfur dioxide waste liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1451616A CN1451616A (en) | 2003-10-29 |
| CN1180995C true CN1180995C (en) | 2004-12-22 |
Family
ID=29222899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031265944A Expired - Fee Related CN1180995C (en) | 2003-05-16 | 2003-05-16 | Method for treating high-concentration sulfur dioxide waste liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1180995C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007107111A1 (en) | 2006-03-23 | 2007-09-27 | Mg Century Mining Corporation | Mg-slag brick with high strength and method for preparing the same |
| CN104355475B (en) * | 2014-11-13 | 2016-02-24 | 湖北华巳新能源环保工程有限公司 | A kind for the treatment of process of G salt mother liquor |
| CN105032149A (en) * | 2015-07-07 | 2015-11-11 | 沈阳化工大学 | Calcium carbonate/calcium hydrate-gypsum wet desulphurization and dedusting process for flue gas |
-
2003
- 2003-05-16 CN CNB031265944A patent/CN1180995C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1451616A (en) | 2003-10-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109775743B (en) | Method for extracting pure calcium fluoride from calcium fluoride sludge | |
| CN113620331B (en) | CO (carbon monoxide)2Method for preparing nanosphere aragonite calcium carbonate by mineralizing carbide slag | |
| CN105016589B (en) | A kind of method of iron cement recycling | |
| CN102491402A (en) | Method for producing refined copper oxide by utilizing acidic waste etching solution | |
| CN109179476B (en) | Method for controlling water content of titanium gypsum | |
| CN102390848B (en) | Comprehensive utilization process for magnesium sulfate | |
| CN101531384A (en) | Technique for preparing electronic grade magnesium hydrate and ammonium sulphate by cycle serum featuring in flue gas desulfurization by method of magnesium oxidization | |
| CN102285676B (en) | Method for preparing nano calcium carbonate from epoxypropane saponification waste water by chlorhydrin method | |
| CN1180995C (en) | Method for treating high-concentration sulfur dioxide waste liquid | |
| CN101816889A (en) | Desulphurization process by combining printing and dyeing wastewater | |
| CN102285677B (en) | Method for producing calcium chloride based on carbide slag as raw material | |
| CN113929328A (en) | Method for promoting crystal growth of desulfurized gypsum by regulating and controlling carbide slag-based desulfurizer | |
| CN112028094A (en) | Method for preparing magnesium hydroxide and calcium chloride by treating desulfurization wastewater of coal-fired power plant | |
| CN1377830A (en) | Producing light calcium carbonate from calcium carbide waste slurry | |
| CN109081382A (en) | A kind of processing technology of bodied ferric sulfate | |
| CN113603127B (en) | Method for concentrated sulfuric acid treatment of calcium chloride wastewater and co-production of chemical gypsum | |
| CN101935061B (en) | Method for removing impurity of mother liquid in preparation process of calcium carbonate crystal whisker | |
| CN110304755A (en) | A kind of wastewater treatment method and its processing system containing electrolytic manganese residues | |
| CN114804673A (en) | Comprehensive utilization method of red mud | |
| CN109095731A (en) | A kind of system based on magnesium processes desulfurization wastewater high-purity magnesium hydroxide | |
| CN209338324U (en) | A kind of system based on magnesium processes desulfurization wastewater high-purity magnesium hydroxide | |
| CN111484081B (en) | Method for preparing manganese carbonate, ammonium sulfate and dry powder building coating by using electrolytic manganese leaching residues | |
| CN105540813A (en) | Nano calcium carbonate filter pressing wastewater treatment method and equipment | |
| CN1270982C (en) | Process for comprensive treating waste water of paper making by grass pulp | |
| CN114105343A (en) | Method for cooperatively treating desulfurization ash by desulfurization wastewater treatment system and application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |