CN102826582A - Method for producing impurity-bearing liquid calcium chloride by utilization of converter dedusting wastewater - Google Patents
Method for producing impurity-bearing liquid calcium chloride by utilization of converter dedusting wastewater Download PDFInfo
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- CN102826582A CN102826582A CN2011101599740A CN201110159974A CN102826582A CN 102826582 A CN102826582 A CN 102826582A CN 2011101599740 A CN2011101599740 A CN 2011101599740A CN 201110159974 A CN201110159974 A CN 201110159974A CN 102826582 A CN102826582 A CN 102826582A
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- converter
- waste water
- carbide slag
- calcium chloride
- dust
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Abstract
The invention discloses a method for impurity-bearing liquid calcium chloride by the utilization of converter dedusting wastewater. Materials for the production of the impurity-bearing liquid calcium chloride comprise the converter dedusting wastewater, a pickling waste liquid and dust or carbide slag. The method comprises the following steps of: a, examining mole concentration of HCl in the pickling waste liquid and mass percentage of CaO in the dust or carbide slag; calculating mole number of the added converter dedusting wastewater, dust or carbide slag and pickling waste liquid required by each unit volume of an impurity-bearing CaCl2 solution according to the mole concentration of the impurity-bearing CaCl2 solution which is expected to be prepared and according to the formula of CaO+2HCl=CaCl2+H2O, and calculating the volume of the added converter dedusting wastewater and the pickling waste liquid and the weight of dust or carbide slag which are required by each unit volume of the impurity-bearing CaCl2 solution according to the mole concentration of HCl in the pickling waste liquid and mass percentage of CaO in dust or carbide slag; b, preparing an emulsion by the use of the dust or carbide slag and the converter dedusting wastewater in an emulsion preparation pot; c, respectively adding the emulsion prepared from the step b, the pickling waste liquid and the converter dedusting wastewater into a neutralization pond; and d, allowing the solution obtained from the step c to flow into a settler for static settlement. The clear upper layer is the impurity-bearing liquid calcium chloride solution.
Description
Technical field
The invention belongs to environment protection and technical field of resource utilization, relate in particular to a kind of method of in ferrous metallurgy, utilizing dust waste water of converter production to contain assorted liquid calcium chloride.
Background technology
Produced the great amount of high-temperature flue gas in the convertor steelmaking process; Fixedly petticoat pipe and gasification cooling flue are cooled to 800 ℃～1000 ℃ to flue gas through movable gas hood, top; Then successively through fixedly Venturi meter (being commonly called as a literary composition) and the adjustable Venturi meter of secondary (being commonly called as two literary compositions) washing of one-level water overflow, again through gravity dehydration device and 90 ° of elbows; Dust in the flue gas is removed, reduced the temperature of stack gas simultaneously.The water that supplies the two-stage Venturi meter to carry out dedusting and cooling uses the back to discharge through water trap, is dust waste water of converter.Its pH value is high, high, the suspension object height of hardness, must be after treatment could reuse or efflux, otherwise will cause system's fouling, environmental pollution and the wasting of resources.The treatment process of traditional dust waste water of converter is to use the dosing coagulating sedimentation, and shortcoming is that processing cost is high, and simultaneously because outer draining variation water quality, the discharging that exceeds standard of part pollutent causes destruction in various degree to environment.Like certain steelwork converter dust waste water,, add soda ash and remove hardness through coarse separator; Flow into inclined-plate clarifying basin, remove a large amount of throw outs, reduce water temperature through cooling tower again; Flow into suction well at last, after handling through this four procedure, a part of water carries out regeneration through advanced treatment; Some water effluxes, and outer discharge capacity reaches 100～200m
3/ h, outer draining water-quality guideline is Cl
-: 0.18mg/L, pH:11.74, Ca
2+: 59.60mg/L, directly discharge not still to water resource waste, and also can pollute environment and water body.
In the course of processing of steel product; Often to carry out processing of rust removing to its surface with hydrochloric acid; Produce a large amount of spent pickle liquors thus, generally adopt the Shandong to grow nanofarad and reclaim hydrochloric acid and produce the red iron oxide sub product, but this method investment operation cost is high, energy consumption is high; Some small business do not have condition that acid waste liquid is recycled, and general the employing adds the processing of alkali neutral method.Owing to contain acid waste liquid through adding the alkali neutralizing treatment; The situation that often occurs that the pH value exceeds standard or ss suspended solid exceeds standard; When effluxing pipeline and environment caused and have a strong impact on; And the annual effluent charge that will pay considerable number, cold rolling acid waste liquid processing cost is high and be difficult to qualified discharge, is an environmental protection difficult problem that troubles iron and steel enterprise always.Seek a low cost, less energy-consumption, free of contamination spent pickle liquor recoverying and utilizing method, have important practical significance.
In addition, iron and steel enterprise produces a large amount of higher dedusting ash of CaO content, reaches 50.2% like certain steel-making LF stove dedusting ash CaO content; Because sulphur content is up to 0.712%; And can't can only transport to garbage loading embeading factory landfill as steel-making solvent or sintering solvent, this method is handled LF stove dedusting ash; Not only increased the cost of enterprise, and be a kind of waste the calcium resource.
On the other hand; Calcium chloride is widely used as siccative, textile sizing agent and fireproofing agent, road surface dust-collecting agent, food preservatives, refrigeration agent, harbour and airport and synergistic agent, aluminum chloride and the bariumchloride of road surface antifogging agent, dyestuff grinding aid, snow-melting agent, water purification agent, agglomerate and pellet and the raw material of calcium salt etc. as a kind of important chemical material, and use range is wide, demand is big.The calcium chloride product both can be solid, also can make liquid; In fact; A lot of calcium chloride products do not need very high purity; Like the synergistic agent of road surface dust-collecting agent, harbour and airport and road surface antifogging agent, agglomerate and pellet etc., these products are not calculated mostly with the higher calcium chloride product preparation of purity economically.
The number of accepting is that 200810015605.2 patent " a kind of method of utilizing industrial waste acid to produce liquid calcium chloride " proposes to utilize the abraum salt acid behind block Wingdale and the strip pickling to react according to certain ratio; Neutralize with milk of lime; Obtain certain density calcium chloride solution, but do not mention with cold-rolling pickling waste liquid, dust waste water of converter and dedusting ash prepared in reaction calcium chloride solution.
The number of accepting is 200610124541.0 patent " a kind of method of utilizing industrial waste carbide slag to produce calcium chloride "; Utilize carbide slag and technical hydrochloric acid under 40 ℃～95 ℃ conditions, to react; Add activated carbon decolorizing, add bariumchloride and remove sulfate ion, filter, concentrate, crystallization, drying obtain calcium chloride.Not mentionedly prepare calcium chloride, and this technical process is long, and needs extra control reaction temperature with spent pickle liquor.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, dust waste water of converter is carried out recycling, technical problem to be solved by this invention provides a kind of method of utilizing dust waste water of converter production to contain assorted liquid calcium chloride.
The present invention includes dust waste water of converter, spent pickle liquor and dedusting ash or carbide slag, concrete steps are following:
The volumetric molar concentration of HCl in a, the check spent pickle liquor, the mass percent of CaO in dedusting ash or the carbide slag; According to containing of required preparation of assorted CaCl
2The volumetric molar concentration of solution generates unit volume according to computes and contains assorted CaCl
2The mole number of the dust waste water of converter of the required adding of solution, dedusting ash or carbide slag, spent pickle liquor, the mass percent of CaO in volumetric molar concentration, dedusting ash or the carbide slag of HCl in foundation and the spent pickle liquor is again calculated and is generated unit volume and contain assorted CaCl
2The quality of the dust waste water of converter of the required adding of solution, the volume of spent pickle liquor and dedusting ash or carbide slag;
CaO+2HCl＝CaCl
2+H
2O
B, dedusting ash or carbide slag and dust waste water of converter are carried out the emulsion preparation in joining breast jar.
C, the emulsion of respectively b step being joined and spent pickle liquor and dust waste water of converter join in the neutralization tank;
D, c is gone on foot gained solution flow into settling tank and staticly settle, limpid being in upper strata contains assorted liquid calcium chloride solution.
B step and c step dust waste water of converter summation equal the dust waste water of converter total amount of a step calculating.
Adopt the inventive method can obtain following beneficial effect: the processing cost of 1, having practiced thrift dust waste water of converter makes this waste water obtain recycling.Calcium ion in the dust waste water obtains utilizing, and avoids the use of expensive medicament---soda ash, has practiced thrift the medicament expense usefulness of great number, has improved area ecological environment simultaneously; 2, the cold-rolling pickling waste liquid gets utilization, and the remaining hydrochloric acid in the spent pickle liquor is utilized effectively, and grows the energy consumption that nanofarad is handled spent pickle liquor but also reduced traditional Shandong; 3, dedusting ash (or carbide slag) gets utilization, and practices thrift its processing cost, avoids its contaminate environment; 4, this legal system is equipped with CaCl
2The cost of solution is low, can be used for different occasions, and steel industry can be suited measures to local conditions, and carries out the civil engineering of a little and the input of installation cost and just can prepare this CaCl
2Solution reduces the enterprise production cost, and this method has very big application value.
Description of drawings
Fig. 1 utilizes dust waste water of converter production to contain the process flow sheet of assorted liquid calcium chloride.
Embodiment
Below in conjunction with embodiment the present invention is further specified:
Embodiment 1
The volumetric molar concentration of HCl is 2.53mol/L in the check spent pickle liquor, and the CaO massfraction is 50.20% in the LF stove dedusting ash; Confirm the CaCl that contains of required preparation
2The volumetric molar concentration 0.18mol/L of waste water solution.Concrete technology is following: with LF stove dedusting ash 972.69kg and 10m
3Cold rolling acid-bearing wastewater add and join breast jar, stir and process milk of lime after 1 hour; Again respectively milk of lime of processing and 9.96m
3Spent pickle liquor add neutralization tank, inject 50.04m
3Dust waste water of converter, solution after the neutralization flows into settling tank and staticly settles the limpid CaCl that is in upper strata
2Volumetric molar concentration is containing of 0.18mol/L of an assorted liquid calcium chloride solution.
Embodiment 2
The volumetric molar concentration of HCl is 2.53mol/L in the check spent pickle liquor, and the CaO massfraction is 63.00% in the carbide slag; Confirm containing of required preparation of assorted CaCl
2The volumetric molar concentration 0.10mol/L of solution.Concrete technology is following: with dried slag of calcium carbide and the 5.20m of 417.65kg
3Dust waste water of converter add and to join breast jar, stir and process milk of lime after 1 hour; Again respectively milk of lime of processing and 5.53m
3Spent pickle liquor add neutralization tank, inject 59.27m
3Dust waste water of converter,, solution after the neutralization flows into settling tank and staticly settles the limpid CaCl that is in upper strata
2Volumetric molar concentration is containing of 0.10mol/L of an assorted liquid calcium chloride solution.
Claims (2)
1. a method of utilizing dust waste water of converter production to contain assorted liquid calcium chloride comprises dust waste water of converter, spent pickle liquor and dedusting ash or carbide slag, and concrete steps are following:
The volumetric molar concentration of HCl in a, the check spent pickle liquor, the mass percent of CaO in dedusting ash or the carbide slag; According to containing of required preparation of assorted CaCl
2The volumetric molar concentration of solution generates unit volume according to computes and contains assorted CaCl
2The mole number of the dust waste water of converter of the required adding of solution, dedusting ash or carbide slag, spent pickle liquor, the mass percent of CaO in volumetric molar concentration, dedusting ash or the carbide slag of HCl in foundation and the spent pickle liquor is again calculated and is generated unit volume and contain assorted CaCl
2The quality of the dust waste water of converter of the required adding of solution, the volume of spent pickle liquor and dedusting ash or carbide slag;
CaO+2HCl＝CaCl
2+H
2O
B, dedusting ash or carbide slag and dust waste water of converter are carried out the emulsion preparation in joining breast jar;
C, the emulsion of respectively b step being joined and spent pickle liquor and dust waste water of converter join in the neutralization tank;
D, c is gone on foot gained solution flow into settling tank and staticly settle, limpid being in upper strata contains assorted liquid calcium chloride solution.
2. according to the said method of utilizing dust waste water of converter production to contain assorted liquid calcium chloride of claim 1, it is characterized in that described b step and c step dust waste water of converter summation equal the dust waste water of converter total amount of a step calculating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110159974.0A CN102826582B (en) | 2011-06-14 | 2011-06-14 | Method for producing impurity-bearing liquid calcium chloride by utilization of converter dedusting wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110159974.0A CN102826582B (en) | 2011-06-14 | 2011-06-14 | Method for producing impurity-bearing liquid calcium chloride by utilization of converter dedusting wastewater |
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| Publication Number | Publication Date |
|---|---|
| CN102826582A true CN102826582A (en) | 2012-12-19 |
| CN102826582B CN102826582B (en) | 2015-04-08 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105858702A (en) * | 2016-05-24 | 2016-08-17 | 江苏新泰材料科技股份有限公司 | Technology for calcium chloride with fluoride-containing hydrochloric acid |
| CN106745960A (en) * | 2016-11-25 | 2017-05-31 | 江苏省沙钢钢铁研究院有限公司 | A kind of method for making steel refining dedusting ash comprehensive utilization |
| CN109331597A (en) * | 2018-11-26 | 2019-02-15 | 汕头市联和环保科技有限公司 | Spray tower waste gas purification recovery device |
| CN115093057A (en) * | 2022-07-20 | 2022-09-23 | 武汉钢铁有限公司 | Method for treating continuous casting turbid ring wastewater by using converter flue gas washing circulating water sewage |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005145818A (en) * | 2004-12-28 | 2005-06-09 | Kishun Kin | Method and apparatus for treating aqueous halogen compound solution, aqueous acidic solution or acidic gas |
| CN1923700A (en) * | 2006-09-15 | 2007-03-07 | 游川北 | Method of producing calcium chloride from industrial waste carbide slag |
| CN101045546A (en) * | 2007-04-28 | 2007-10-03 | 沈阳化工股份有限公司 | Production method of calcium chloride snow melting agent |
| CN101254937A (en) * | 2008-03-24 | 2008-09-03 | 莱芜钢铁股份有限公司 | Method for producing liquid calcium chloride by using industry waste acid |
-
2011
- 2011-06-14 CN CN201110159974.0A patent/CN102826582B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005145818A (en) * | 2004-12-28 | 2005-06-09 | Kishun Kin | Method and apparatus for treating aqueous halogen compound solution, aqueous acidic solution or acidic gas |
| CN1923700A (en) * | 2006-09-15 | 2007-03-07 | 游川北 | Method of producing calcium chloride from industrial waste carbide slag |
| CN101045546A (en) * | 2007-04-28 | 2007-10-03 | 沈阳化工股份有限公司 | Production method of calcium chloride snow melting agent |
| CN101254937A (en) * | 2008-03-24 | 2008-09-03 | 莱芜钢铁股份有限公司 | Method for producing liquid calcium chloride by using industry waste acid |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105858702A (en) * | 2016-05-24 | 2016-08-17 | 江苏新泰材料科技股份有限公司 | Technology for calcium chloride with fluoride-containing hydrochloric acid |
| CN106745960A (en) * | 2016-11-25 | 2017-05-31 | 江苏省沙钢钢铁研究院有限公司 | A kind of method for making steel refining dedusting ash comprehensive utilization |
| CN109331597A (en) * | 2018-11-26 | 2019-02-15 | 汕头市联和环保科技有限公司 | Spray tower waste gas purification recovery device |
| CN115093057A (en) * | 2022-07-20 | 2022-09-23 | 武汉钢铁有限公司 | Method for treating continuous casting turbid ring wastewater by using converter flue gas washing circulating water sewage |
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|---|---|
| CN102826582B (en) | 2015-04-08 |
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