CN102826582B - 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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- CN102826582B CN102826582B CN201110159974.0A CN201110159974A CN102826582B CN 102826582 B CN102826582 B CN 102826582B CN 201110159974 A CN201110159974 A CN 201110159974A CN 102826582 B CN102826582 B CN 102826582B
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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, particularly relate to a kind of dust waste water of converter that utilizes in ferrous metallurgy and produce the method containing assorted liquid calcium chloride.
Background technology
A large amount of high-temperature flue gas is created in convertor steelmaking process, flue gas through movable gas hood, petticoat pipe is fixed on top and gasification cooling flue is cooled to 800 DEG C ~ 1000 DEG C, then Venturi meter (be commonly called as a literary composition) is fixed by the overflow of one-level water successively and the adjustable Venturi meter of secondary (being commonly called as two literary compositions) washs, again through gravity dewatering apparatus and 90 ° of elbows, dust in flue gas is removed, reduces the temperature of stack gas simultaneously.Carry out the water of dedusting and cooling for two-stage Venturi meter, discharged by water trap after using, be dust waste water of converter.Its pH value is high, hardness is high, suspension object height, could reuse or arrange outward after having to pass through process, otherwise will cause scaling, environmental pollution and the wasting of resources.The treatment process of traditional dust waste water of converter uses dosing coagulating sedimentation, and shortcoming is that processing cost is high, and simultaneously because outer draining variation water quality, part pollutent discharge beyond standards, causes destruction in various degree to environment.As certain steelwork converter dust waste water, through coarse separator, add soda ash and remove hardness, flow into inclined-plate clarifying basin, remove a large amount of throw out, water temperature is reduced again through cooling tower, finally flow into suction well, after this four procedures process, a part of water carries out regeneration by advanced treatment, some water is arranged outward, 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 is not still to water resource waste, and also can pollute environment and water body.
In the course of processing of steel product, often with hydrochloric acid, processing of rust removing is carried out to its surface, produce a large amount of spent pickle liquors thus, general employing Shandong is grown nanofarad recovery hydrochloric acid and is produced red iron oxide byproduct, but this method investment operation cost is high, energy consumption is high, some small business do not have condition to recycle acid waste liquid, and general employing adds the method process of alkali neutralization.Alkali neutralizing treatment is added owing to passing through containing acid waste liquid, often occur that pH value exceeds standard or ss suspended solid exceeds standard situation, during outer row, pipeline and environment are caused and have a strong impact on, and the effluent charge of considerable number will be paid every year, cold rolling acid waste liquid processing cost is high and be difficult to qualified discharge, is the difficult problem of environmental protection troubling iron and steel enterprise always.Find 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 the higher dedusting ash of a large amount of CaO content, as certain LF furnace dedusting ash CaO content reaches 50.2%, because sulphur content is comparatively up to 0.712%, and steel-making solvent or sintering solvent cannot be used as, garbage loading embeading factory landfill can only be transported to, this method process LF stove dedusting ash, not only increase the cost of enterprise, and be that the one of calcium resource is wasted.
On the other hand, calcium chloride is widely used as the raw material etc. of the synergistic agent of siccative, textile sizing agent and fireproofing agent, road surface dust-collecting agent, food preservatives, refrigeration agent, harbour and airport and road surface antifogging agent, dyestuff grinding aid, snow-melting agent, water purification agent, agglomerate and pellet, aluminum chloride and bariumchloride and calcium salt as a kind of important industrial chemicals, and use range is wide, demand is large.Calcium chloride product both can be solid, also can make liquid, in fact, a lot of calcium chloride product is without the need for very high purity, as the synergistic agent etc. of road surface dust-collecting agent, harbour and airport and road surface antifogging agent, agglomerate and pellet, the calcium chloride product preparation that the large multiplex purity of these products is higher, does not calculate economically.
The number of accepting be 200810015605.2 patent " a kind of industrial waste acid that utilizes produces the method for liquid calcium chloride " propose the waste hydrochloric acid after utilizing block Wingdale and strip pickling and react according to certain ratio, with lime slurry neutralization, obtain certain density calcium chloride solution, but do not mention with cold-rolling pickling waste liquid, dust waste water of converter and dedusting ash reaction prepare calcium chloride solution.
The number of accepting is the patent " a kind of method utilizing industrial waste carbide slag to produce calcium chloride " of 200610124541.0, carbide slag and technical hydrochloric acid is utilized to react under 40 DEG C ~ 95 DEG C conditions, add activated carbon decolorizing, add bariumchloride and remove sulfate ion, filter, concentrated, crystallization, drying obtain calcium chloride.Not mentioned spent pickle liquor prepares calcium chloride, and this technical process is long, and needs additionally to control temperature of reaction.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, carry out recycling to dust waste water of converter, technical problem to be solved by this invention is to provide a kind of dust waste water of converter that utilizes and produces the method containing 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 as follows:
The volumetric molar concentration of HCl in a, inspection spent pickle liquor, the mass percent of CaO in dedusting ash or carbide slag; According to required preparation containing assorted CaCl
2the volumetric molar concentration of solution, calculates according to following formula and generates unit volume containing assorted CaCl
2the mole number of the dust waste water of converter added required for solution, dedusting ash or carbide slag, spent pickle liquor, then the mass percent of CaO in the volumetric molar concentration of HCl, dedusting ash or carbide slag in foundation and spent pickle liquor, calculate and generate unit volume containing assorted CaCl
2the quality of the dust waste water of converter added required for 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 emulsion preparation joining in newborn tank.
C, b is walked the emulsion and spent pickle liquor of joining and dust waste water of converter joins in neutralization tank respectively;
D, c walked gained solution and flow into settling tank and staticly settle, upper strata is limpid to be containing assorted liquid chlorine calcium solution.
B step and c walk the dust waste water of converter total amount that dust waste water of converter summation equals the calculating of a step.
Adopt the inventive method can obtain following beneficial effect: 1, to save dust waste water of converter processing cost, make this waste water obtain recycling.Calcium ion in dust waste water is utilized, and avoids using high cost medicament---soda ash, and save the medicament expense use of great number, improve area ecological environment simultaneously; 2, cold-rolling pickling waste liquid gets utilization, and not only makes the remaining hydrochloric acid in spent pickle liquor be utilized effectively, but also reduces the energy consumption that nanofarad process spent pickle liquor is grown in traditional Shandong; 3, dedusting ash (or carbide slag) gets utilization, and saves its processing cost, avoids its contaminate environment; 4, this legal system is for CaCl
2the cost of solution is low, may be used for different occasion, and steel industry can be suited measures to local conditions, and the input of carrying out a little civil engineering and installation cost just can prepare this CaCl
2solution, reduce enterprise's production cost, the method has very large application value.
Accompanying drawing explanation
Fig. 1 utilizes dust waste water of converter to produce the process flow sheet containing assorted liquid calcium chloride.
Embodiment
Below in conjunction with embodiment, the present invention is further described:
Embodiment 1
In inspection spent pickle liquor, the volumetric molar concentration of HCl is that in 2.53mol/L, LF stove dedusting ash, CaO massfraction is 50.20%; That determines required preparation contains CaCl
2the volumetric molar concentration 0.18mol/L of waste water solution.Concrete technology is as follows: by LF stove dedusting ash 972.69kg and 10m
3cold rolling acid-bearing wastewater add and join newborn tank, stir and make milk of lime after 1 hour; Again respectively the milk of lime made and 9.96m
3spent pickle liquor add neutralization tank, inject 50.04m
3dust waste water of converter, solution after neutralization flows into settling tank and staticly settles, and upper strata is limpid is CaCl
2volumetric molar concentration be 0.18mol/L containing assorted liquid chlorine calcium solution.
Embodiment 2
In inspection spent pickle liquor, the volumetric molar concentration of HCl is 2.53mol/L, and in carbide slag, CaO massfraction is 63.00%; That determines required preparation contains assorted CaCl
2the volumetric molar concentration 0.10mol/L of solution.Concrete technology is as follows: by dry for the calcium carbide of 417.65kg slag and 5.20m
3dust waste water of converter add and join newborn tank, stir and make milk of lime after 1 hour; Again respectively the milk of lime made and 5.53m
3spent pickle liquor add neutralization tank, inject 59.27m
3dust waste water of converter, solution after neutralization flows into settling tank and staticly settles, and upper strata is limpid is CaCl
2volumetric molar concentration be 0.10mol/L containing assorted liquid chlorine calcium solution.
Claims (2)
1. utilize dust waste water of converter to produce the method containing assorted liquid chlorine calcium solution, comprise dust waste water of converter, spent pickle liquor and dedusting ash or carbide slag, concrete steps are as follows:
The volumetric molar concentration of HC1 in a, inspection spent pickle liquor, the mass percent of CaO in dedusting ash or carbide slag; Again according to the volumetric molar concentration of HC1 in spent pickle liquor, in dedusting ash or carbide slag, the mass percent of CaO, calculates according to following formula and generates unit volume containing assorted CaC1
2the quality of the dust waste water of converter added required for solution, the volume of spent pickle liquor and dedusting ash or carbide slag;
CaO+2HC1＝CaC1
2+H
2O
B, dedusting ash or carbide slag and dust waste water of converter are carried out emulsion preparation joining in newborn tank;
C, b is walked the emulsion and spent pickle liquor of joining and dust waste water of converter joins in neutralization tank respectively;
D, c walked gained solution and flow into settling tank and staticly settle, upper strata is limpid to be containing assorted liquid chlorine calcium solution.
2. utilize dust waste water of converter to produce the method containing assorted liquid chlorine calcium solution according to claim 1, it is characterized in that described b step and c walk the dust waste water of converter total amount that dust waste water of converter summation equals the calculating of a step.
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|---|---|---|---|
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|---|---|---|---|
| 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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| CN102826582B true CN102826582B (en) | 2015-04-08 |
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| 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 |
| CN106745960B (en) * | 2016-11-25 | 2020-11-13 | 江苏省沙钢钢铁研究院有限公司 | Comprehensive utilization method of steelmaking refining fly ash |
| 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 (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| JP4137052B2 (en) * | 2004-12-28 | 2008-08-20 | 煕濬 金 | Method and apparatus for treating halogen compound aqueous solution, acidic aqueous solution or acidic gas |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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