CN111453782B - Steel plant water treatment filter material and application thereof - Google Patents
Steel plant water treatment filter material and application thereof Download PDFInfo
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- CN111453782B CN111453782B CN201910053348.XA CN201910053348A CN111453782B CN 111453782 B CN111453782 B CN 111453782B CN 201910053348 A CN201910053348 A CN 201910053348A CN 111453782 B CN111453782 B CN 111453782B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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Abstract
The invention discloses two kinds of filter materials for water treatment in steel plants and application, wherein one kind of filter material is prepared as follows: 1. after the waste refractory materials are classified, the true density is 1.4-2.5 g/cm3The average particle size of the filter material is 1.5-5 mm, and the filter material is used as a light refractory material filter material; taking the true density of 2.5-3.2 g/cm3Taking the mixture with the average particle size of 0.5-3 mm as a medium-quality refractory material filter material; the true density is not less than 3.2g/cm3Taking the material with the average particle size of 4-10 mm as a heavy refractory material filter material; 2. and sequentially putting heavy, medium and light refractory filter materials into a filter container according to the supporting layer at the bottom layer and the filter layers at the middle layer and the upper layer, wherein the volume ratio of the heavy, medium and light refractory filter materials to the supporting layer at the bottom layer to the filter layers at the middle layer and the upper layer is 0-20: 20-40: 30-80. The other filter material is the steel slag filter material substituted by the heavy refractory material filter material.
Description
Technical Field
The invention relates to the technical field of industrial water treatment, in particular to a water treatment filter material for a steel plant and application thereof.
Background
Water is an important natural resource, and as a water-consuming large-scale steel plant, a water treatment system of the water treatment plant usually adopts the processes of coagulation, precipitation, filtration and the like to remove substances such as suspended matters, turbidity, oil and the like in wastewater, so as to achieve the purposes of purifying water quality and recycling. The filtration step is: under the action of gravity or pressure difference, the waste water passes through the pore channels of the porous material layer, and impurities such as suspended matters and the like are intercepted on the medium. The porous materials used for filtration are referred to as filter media or filter media.
At present, anthracite, quartz sand and gravel are often selected as the filtering material for water treatment in steel plants. Although the one-time purchase and filling cost is relatively low, the disadvantage is that the service life is only 2 to 3 years generally; meanwhile, hardening is easily formed in the filtering process, so that filtering pore channels are blocked, and the effluent quality and the treated water quantity are influenced. Therefore, the development of a novel filter medium with low cost and high efficiency is always an important subject for water treatment in steel plants.
Chinese patent publication No. CN100519430C discloses a process for applying ceramic particle filter material in the treatment of wastewater in the steel industry. Ceramic particle filter materials are filled in a filter tank of a steel industrial wastewater treatment device. The ceramic particle filter material comprises a ceramsite filter material, a porcelain sand filter material and a porcelain ball filter material which are sequentially filled in the filter tank layer by layer from top to bottom. The technical scheme involved in the method has good filtering effect, but the ceramic particle filtering material has unstable source and relatively high cost.
Chinese patent publication No. CN100522827C discloses a method for treating sewage with metallurgical slag. The metallurgical slag double-filter material is composed of metallurgical water-quenched slag and metallurgical heavy slag, and the filter material is filled into a filter tower (tank) for sewage treatment. The metallurgical slag filter material in the method has low cost and wide source, but the metallurgical slag has small amount of micropores and low specific surface area, so the filtering and adsorbing capacity of the metallurgical slag filter material is not strong.
Chinese patent publication No. CN103977636A discloses a method for preparing water treatment filter material from waste red brick blocks. The method mainly aims at the problem of treatment of waste red brick blocks of building wastes, and the waste red brick blocks are crushed, screened and graded to prepare filter materials with 3 specifications of particle sizes for sewage treatment. The waste red bricks used by the method have wide sources and low cost, but have low density and poor mechanical strength, and are not suitable for filter materials for water treatment.
In addition, steel plants can produce a lot of solid wastes, such as slag, waste refractory materials, dust and mud, during the production process, the stacking of the solid wastes can occupy a large amount of land and pollute the surrounding environment, the resource utilization degree is low, and the problems are urgently needed to be solved and treated.
Disclosure of Invention
The invention aims to provide the filter material for the water treatment in the steel plant, which has the advantages of wide raw material source, low cost, excellent filtering effect and long service life.
The technical problem to be solved can be implemented by the following technical scheme.
A water treatment filter material for a steel plant is prepared by the following steps:
1) preparing materials:
selecting waste refractory materials of a steel plant to classify, crush, screen and wash according to the application and the physical and chemical properties;
selecting a material with a true density of 1.4 or more and less than 2.5g/cm3Taking the product with the average particle size of 1.5-5 mm as a light refractory material filter material for later use; according to the mass percentage, the light refractory material filter material consists of 10-75% of alumina, 10-75% of silicon dioxide, 0-70% of magnesium oxide, 5-20% of a binder and 0-10% of impurities which mainly comprise oxides; the binder may be an inorganic binder including silicate-based, phosphate-based, and metal oxide-based binders such as titanium and zirconium; the adhesive may be an organic adhesive including a phenol resin, an epoxy resin, a polytetrafluoroethylene, and a silicone. The types of the impurities are related to the components of the steel and the molten iron in the using process of the refractory material; this is true both with respect to binder and oxide impurities as described below.
Selecting a material with true density of more than or equal to 2.5 and less than 3.2g/cm3Taking the product with the average particle size of 0.5-3 mm as a medium-quality refractory material filter material for later use; according to the mass percentage, the medium-quality refractory material filter material consists of 10-75% of alumina, 10-75% of silicon dioxide, 5-70% of magnesium oxide, 0-5% of calcium oxide, 0-5% of ferric oxide and 0-5% of impurities mainly containing oxides;
selecting a material with a true density of 3.2g/cm or more3Taking the product with the average particle size of 4-10 mm as a heavy refractory material filter material for later use; according to the mass percentage, the heavy refractory filter material consists of 0-60% of zirconia, 0-60% of chromic oxide, 5-90% of alumina, 0-10% of silicon dioxide, 0-20% of magnesia and 0-10% of impurities which mainly comprise oxides;
2) the heavy refractory filter material is placed in the bottom layer of a filter container to serve as a supporting layer, the medium refractory filter material is placed in the middle layer of the filter container to serve as a second filter layer, the light refractory filter material is placed in the upper layer of the filter container to serve as a first filter layer, and the volume percentage of the heavy refractory filter material to the medium refractory filter material to the light refractory filter material is 0-20%, 20-40%, and 30-80%.
As a preferred embodiment of the water treatment filter material, in the step 2), the volume percentage of the heavy refractory material filter material, the medium refractory material filter material and the light refractory material filter material is 12-20%, 25-38% and 42-63%.
As a more preferable embodiment of the water treatment filter material, in the step 2), the volume percentage of the heavy refractory filter material, the medium refractory filter material and the light refractory filter material is 16 percent, 28 percent and 56 percent.
As a further improvement of the technical scheme, the raw material of the light refractory material filter material is selected from one or more of waste refractory materials of steel plants, including castable and spray coating; the raw material of the medium refractory material filter material is selected from one or more of waste refractory materials of steel plants including aluminum silicate and magnesium oxide; the raw material of the heavy refractory filter material is selected from one or more of heavy metal oxide containing zirconium, chromium and corundum and/or compact waste refractory material with low porosity.
The invention aims to solve another technical problem of providing another filter material for water treatment in steel plants, which has the advantages of wide raw material source, low cost, excellent filtering effect and long service life.
In order to solve the technical problem, the invention adopts the following technical scheme.
A water treatment filter material for a steel plant is prepared by the following steps:
1) preparing materials A:
selecting waste refractory materials of a steel plant to classify, crush, screen and wash according to the application and the physical and chemical properties;
selecting a material with a true density of 1.4 or more and less than 2.5g/cm3Taking the product with the average particle size of 1.5-5 mm as a light refractory material filter material for later use; according to mass percentIn comparison, the light refractory filter material consists of 10-75% of alumina, 10-75% of silica, 0-70% of magnesia, 5-20% of a binder and 0-10% of impurities mainly containing oxides;
selecting a material with true density of more than or equal to 2.5 and less than 3.2g/cm3Taking the product with the average particle size of 0.5-3 mm as a medium-quality refractory material filter material for later use; according to the mass percentage, the medium-quality refractory material filter material consists of 10-75% of alumina, 10-75% of silicon dioxide, 5-70% of magnesium oxide, 0-5% of calcium oxide, 0-5% of ferric oxide and 0-5% of impurities mainly containing oxides;
2) and preparing a material B:
selecting steel slag of a steel plant, crushing, screening and washing;
selecting the material with true density more than 3.0g/cm3Taking the product with the average particle size of 4-10 mm as a steel slag filter material for later use; according to the mass percentage, the steel slag filter material consists of 30-60% of calcium oxide, 5-20% of ferric oxide, 5-20% of ferrous oxide, 5-15% of silicon dioxide, 0-10% of magnesium oxide and 0-10% of impurities mainly containing oxides;
3) the steel slag filter material is filled into the bottom layer of a filter container to serve as a supporting layer, the medium-quality refractory material filter material is filled into the middle layer of the filter container to serve as a second filter layer, the light-weight refractory material filter material is filled into the upper layer of the filter container to serve as a first filter layer, and the steel slag filter material, the medium-quality refractory material filter material and the light-weight refractory material filter material are 0-20% to 20-40% to 30-80% in percentage by volume.
As the preferable form of the filter material for water treatment in the steel and iron plant, in the step 3), the volume percentage of the steel slag filter material, the medium-quality refractory material filter material and the light refractory material filter material is 12-20%, 25-38% and 42-63%.
As a more preferable form of the filtering material for water treatment in the steel plant, in the step 3), the volume percentage of the steel slag filtering material, the medium-quality refractory material filtering material and the light refractory material filtering material is 16 percent to 28 percent to 56 percent.
As a further improvement of the water treatment filter material in the steel plant, the raw material of the light refractory material filter material is selected from one or more of waste refractory materials in the steel plant, including castable and spray coating; the raw material of the medium refractory material filter material is selected from one or more of waste refractory materials of steel plants, including aluminum silicate and magnesia; the steel slag filter material is prepared from converter steel slag and/or electric furnace steel slag.
Another technical problem to be solved by the present invention is to provide an application of the filter material for water treatment in steel plant in wastewater treatment, which comprises the steps of, before the wastewater is treated by the filter material for water treatment in steel plant, performing surface activation treatment:
adding 30-50 mg/L of surfactant solution into the filtering container, submerging the prepared water treatment filter material of the iron and steel plant, soaking for more than 8 hours, backwashing for 10-15 min every 1-2 hours along with compressed air, wherein the pressure of backwashing compressed air is 0.05-0.08 MPa, and the strength of backwashing compressed air is 0.5-0.8 m3/m2·min。
As a further improvement of the method, the surfactant is one or more of nonylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, alkanolamide and sodium alkylsulfonate.
As a further improvement of the method, the volume percentage of the light refractory filter material in the filter container is positively correlated with the content of suspended matters and oil in the treated wastewater.
Wherein, as a preferred embodiment of the method, when the suspended matter in the treated wastewater is more than 100mg/L or the oil content is more than 15mg/L, the volume ratio of the light refractory filter material to the medium refractory filter material filled in the filter container is more than 2.3; when the suspended matters in the treated wastewater are 40-100 mg/L or the oil content is 10-15 mg/L, the volume ratio of the light-weight refractory filter material to the medium-weight refractory filter material filled in the filter container is 2.0-2.3; when the suspended matter in the treated wastewater is less than 40mg/L or the oil content is less than 10mg/L, the volume ratio of the light-weight refractory filter material to the medium-weight refractory filter material filled in the filter container is less than 2.0.
As a further improvement of the method, the average particle size of the light refractory filter material and the medium refractory filter material is positively correlated with the size of the particulate pollutants in the treated wastewater.
In a preferable embodiment, when the average particle size of suspended matters in the treated wastewater is less than 1 μm, the average particle size of the selected light-weight refractory filter material is 1.5-2.0 mm, and the average particle size of the selected medium-weight refractory filter material is 0.5-1.0 mm; when the average particle size of suspended matters in the treated wastewater is 1-6 mu m, the average particle size of the selected light-weight refractory filter material is 2.0-3.0 mm, and the average particle size of the selected medium-weight refractory filter material is 1.0-1.8 mm; when the average particle size of suspended matters in the treated wastewater is larger than 6 mu m, the average particle size of the selected light-weight refractory material filter material is 3.0-5.0 mm, and the average particle size of the selected medium-weight refractory material filter material is 1.8-3.0 mm.
Compared with the prior art, the filter material for water treatment in the steel plant and the application thereof adopting the technical scheme have the following advantages and beneficial effects:
1. the raw materials of the water treatment filter material for the steel plant provided by the invention directly come from solid wastes (waste refractory materials and steel slag) of the steel plant, have wide sources and low price, are convenient to transport and store in the plant, and consume the solid wastes while being used as a filter medium.
2. The water treatment filter material for the steel plant provided by the invention is mainly prepared from waste refractory materials, and the true density of the light refractory material filter material is 1.8g/cm3Left and right, similar to anthracite; true density of heavy refractory filter material or steel slag filter material>3.0g/cm3The requirement of bearing materials is met; the true density of the medium refractory filter material is between the two. The indexes of mud content, breakage rate, wear rate and the like reach the standards of CJ/T43-2005 filter materials for water treatment. The specific surface area of the filter material of the filter layer can reach 8m2The filter material has the advantages of rich pores, stable chemical property, strong interception and adsorption effects, and can be used as a filter material of a filter (tank) and a filling carrier for microbial treatment and the like.
3. The filter layer of the filter material for water treatment in the steel plant provided by the invention adopts light and medium waste refractory filter materials with different particle sizes and densities, and is very favorable for removing pollutants in the backwashing process through the mutual friction action among different filter materials, the regeneration effect of the filter materials is good, and the service life of the filter materials can reach more than 3 years.
4. After the filter material for water treatment in steel plants provided by the invention is used for reaching the service life, the basic property of the filter material as a refractory material is not changed, and the filter material can be continuously recycled as a production raw material of the refractory material according to the existing refractory material recycling technology.
Drawings
FIG. 1 is a flow chart of the preparation and application of the filter material for water treatment in steel plants;
Detailed Description
The invention aims to provide a water treatment filter material for a steel plant and a use method thereof.
Referring to the preparation process and the use process in the attached figure 1, the technical scheme of the invention is as follows:
firstly, classifying, crushing, screening and washing the waste refractory materials of the steel plant according to the materials and the purposes to obtain a light refractory material filter material, a medium refractory material filter material and a heavy refractory material filter material.
(1) The light refractory filter material is characterized in that the light refractory filter material is prepared from waste bulk refractory materials such as castable, spray coating and the like, the waste refractory materials are concentrated and then conveyed to a crusher to be crushed, then conveyed to a vibrating screen to be screened, large particles are returned to the crusher to be crushed for the second time, floating slag and small particles are removed by washing, and the light refractory filter material meeting the size specification is obtained, and the light refractory filter material is characterized in that the weight of the light refractory filter material is 1.4g/cm3The true density is less than or equal to 2.5g/cm3The average particle size is 1.5-5 mm, and the components include 10-75% of alumina, 10-75% of silica, 0-70% of magnesia, 5-20% of other oxides (impurities mainly including oxides, the same applies hereinafter), and 0-10%.
(2) The medium refractory filter material is prepared from a plurality of waste refractory materials, such as aluminum silicate, magnesium oxide and the like, the waste refractory materials are concentrated and then conveyed to a crusher for crushing, then conveyed to a vibrating screen for screening, large particles are returned to the crusher for secondary crushing, and scum and small particles are removed by washing to obtain the medium refractory filter material meeting the size specificationThe medium-quality refractory material filter material is characterized by being 2.5g/cm3The true density is less than or equal to 3.2g/cm3The average particle size is 0.5-3 mm, and the components include 10-75% of alumina, 10-75% of magnesia, 10-70% of calcium oxide, 5-70% of ferric oxide and 0-5% of other oxides.
(3) The heavy refractory filter material is prepared from compact waste refractory materials containing heavy metal oxides or low in porosity, such as waste refractory materials containing zirconium, chromium, corundum and the like, the waste refractory materials are concentrated and then conveyed to a crusher for crushing, then conveyed to a vibrating screen for screening, large particles are returned to the crusher for secondary crushing, and scum and small particles are removed by washing to obtain the heavy refractory filter material meeting the size specification, and the heavy refractory filter material is characterized in that the true density is not less than 3.2g/cm3The average grain size is 4-10 mm, and the components comprise 0-60% of zirconia, 0-60% of chromia, 0-10% of alumina, 0-20% of magnesia and 0-10% of other oxides.
(4) And (3) discharging the wastewater generated by washing the filter material into a turbid circulating cooling water system of an iron and steel plant nearby for disposal, and recycling the wastewater after treatment.
And secondly, crushing, screening and washing the steel slag of the steel plant to obtain a steel slag filter material. The steel slag filter material is derived from converter steel slag or electric furnace steel slag, the waste steel slag is conveyed to a crusher to be crushed after being concentrated, then conveyed to a vibrating screen to be screened, large particles are returned to the crusher to be crushed for the second time, and the steel slag filter material meeting the size specification is obtained after scum and small particles are removed by washing>3.0g/cm3The average particle size is 4 to 10 mm. The composition comprises (by weight) calcium oxide, ferric oxide, ferrous oxide, silicon dioxide, magnesium oxide and other oxides 30-60%, 5-20%, 5-15%, 0-10% and 0-10%. And (3) discharging the wastewater generated by washing the filter material into a turbid circulating cooling water system of an iron and steel plant nearby for disposal, and recycling the wastewater after treatment.
And thirdly, the filter material for the water treatment in the steel plant comprises a light refractory material filter material, a medium refractory material filter material and a heavy refractory material filter material or a steel slag filter material.
Finally, the water treatment filter material of the steel plant is filled into a filter (pool). The heavy refractory material filter material is filled into the bottom layer of the filter (tank) to be used as a bearing layer, the medium refractory material filter material is filled into the middle layer of the filter (tank) to be used as a filter layer, the light refractory material filter material is filled into the upper layer of the filter (tank) to be used as a filter layer, and the volume percentages of the heavy refractory material filter material, the medium refractory material filter material and the light refractory material filter material are as follows: 0-20%, 20-40%, 30-80%. Wherein, the heavy refractory material filter material can be replaced by a steel slag filter material.
The surface activation treatment is carried out on the water treatment filter material in the steel plant before the wastewater treatment. Adding 30-50 mg/L surfactant solution into a filter (pool), submerging water treatment filter materials of a steel plant, soaking for more than 8 hours, backwashing for 10-15 min every 1-2 hours along with compressed air, wherein the pressure of backwashing compressed air is 0.05-0.08 MPa, and the strength of backwashing compressed air is 0.5-0.8 m3/m2Min. The surfactant comprises one or more of nonylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, alkanolamide and sodium alkyl sulfonate. The wastewater generated by the surface activated filter material is discharged into a turbid circulating cooling water system of an iron and steel plant nearby for disposal, and the wastewater is recycled after being treated.
The selection of the grain diameter and the volume of the filtering material for water treatment in the steel plant is adjusted according to the pollution condition of the wastewater, and when the suspended matters in the wastewater are more and the oil content is large, the volume percentage of the filtering material filled in the lightweight refractory material is increased;
such as:
when the suspended matter in the waste water is more than 100mg/L or the oil content is more than 15mg/L, the volume ratio of the light refractory filter material and the medium refractory filter material is more than 2.3. When the suspended matter in the waste water is 40-100 mg/L or the oil content is 10-15 mg/L, the volume ratio of the light-weight refractory filter material to the medium-weight refractory filter material is 2.0-2.3. When the suspended matter of the wastewater is less than 40mg/L or the oil content is less than 10mg/L, the volume ratio of the light-weight refractory filter material to the medium-weight refractory filter material is less than 2.0.
The volume ratio scheme of the water treatment filter material of the steel plant with more suspended matters or large oil content is optimized.
When the size of the particle pollutants in the wastewater is small, the average particle size of the light refractory filter material and the medium refractory filter material is reduced.
Such as:
when the average particle size of the wastewater suspended matter is less than 1 mu m, the average particle size of the light refractory filter material is 1.5-2.0 mm, and the average particle size of the medium refractory filter material is 0.5-1.0 mm. When the average particle size of the wastewater suspended matter is 1-6 μm, the average particle size of the light refractory filter material is 2.0-3.0 mm, and the average particle size of the medium refractory filter material is 1.0-1.8 mm. When the average particle size of the wastewater suspended matters is larger than 6 mu m, the average particle size of the light refractory material filter material is 3.0-5.0 mm, and the average particle size of the medium refractory material filter material is 1.8-3.0 mm.
The following describes the embodiments of the present invention in further detail with reference to specific examples.
Example 1:
the continuous casting turbid circulating water treatment system of a certain steel plant comprises treatment processes of sedimentation in a cyclone tank, sedimentation in an inclined plate sedimentation tank, filtration by a filter and the like. Wherein, the filter has large load of water inlet suspended matters and oil, the diameter of a single filter is 5000mm, and the treated water quantity is 750m3H, backwash water volume 15m3Min, backwash cycle 1/d.
The heavy refractory filter material selected in the embodiment is derived from waste magnesium-chromium refractory materials of a VD refining furnace, and is crushed, sieved and washed to obtain a heavy refractory filter material with the average particle size of 7mm and the true density of 3.4g/cm3The filter material is filled into the bottom layer of the filter, and the filling height is 0.4 m.
The selected medium refractory filter material is derived from waste magnesia refractory materials of a converter, and the medium refractory filter material is crushed, screened and washed to obtain a medium refractory filter material with the average particle size of 1.5mm and the true density of 2.8g/cm3The filter material of (2) is filled into the upper layer of the filter, and the filling height is 0.7 m.
The selected light refractory filter material is made from waste and old poured refractory materials of a converter, and the average particle size of the filter material is 2.5mm, and the true density of the filter material is 1.9g/cm3The filter material of (2) is filled into the upper layer of the filter, and the filling height is 1.4 m.
Before the filter material is used, 40mg/L of surfactant (nonylphenol polyoxyethylene ether OP-10: sodium dodecyl sulfate: 1) solution is added into a filter (pool), the filter material is submerged and soaked for 8 hours, backwashing is carried out once every 1 hour for 10min, the pressure of backwashing compressed air is 0.07MPa, and the backwashing compressed air is usedStrength 0.6m3/m2And min, performing activation treatment on the surface of the filter material.
The water treatment filter material for the steel plant directly uses continuous casting turbid circulating water in the washing and surface activation processes, wastewater is discharged into a continuous casting water treatment cyclone pool nearby, and water resources are efficiently utilized. As the main component of the filter material is metal oxide, a very small amount of metal ions possibly enter the treated water in the use process, but an alkali adding precipitation step generally exists in a continuous casting turbid circulating water treatment system, so that the normal use of the filter material and the effluent quality are not influenced.
The waste water enters from the upper end of the filter, and the water quality is purified by the interception and adsorption of the filter material, and the service life of the filter material reaches more than 3 years. The water quality indexes of inlet and outlet water of the filter are as follows:
example 1 influent suspension: 36.7 mg/L;
example 1 effluent suspension: 6.6 mg/L;
example 1 water and oil feed: 7.5 mg/L;
example 1 water and oil content: 2.8 mg/L.
Comparative example 1:
the implementation conditions are similar to those of the above example 1, but the comparative example adopts a conventional filter material, gravel is filled in the bottom layer of the filter, the average particle size is 7mm, and the filling height is 0.4 m; quartz sand is filled into the middle layer of the filter, the average grain diameter is 1.25mm, and the filling height is 0.7 m; anthracite coal is loaded into the upper layer of the filter, the average grain diameter is 2.6mm, and the filling height is 1.4 m. Comparative example 1 the water quality index of the inlet water of the filter is the same as that of example 1, and the water quality index of the outlet water is as follows:
comparative example 1 effluent suspension: 8.7 mg/L;
comparative example 1 water and oil fractions: 3.4 mg/L.
The water quality treatment effect of the example 1 is better than that of the comparative example 1.
Example 2:
the hot-rolled turbid circulating water treatment system of a certain steel plant comprises treatment processes of sedimentation in a cyclone tank, sedimentation in a horizontal sedimentation tank, filtration by a filter and the like. Wherein, the filter has large load of water inlet suspended matters and oil, the diameter of a single filter is 5000mm, and the treated water quantity is 700m3/h，Backwashing water quantity of 15m3Min, backwash cycle 1/d.
The heavy refractory filter material selected in the embodiment is made from converter steel slag, and is crushed, sieved and washed to obtain a filter material with an average particle size of 7mm and a true density of 3.3g/cm3The filter material is filled into the bottom layer of the filter, and the filling height is 0.3 m.
The selected medium-quality refractory filter material is made from waste silicon oxide refractory of a coke oven, and the medium-quality refractory filter material is crushed, screened and washed to obtain the medium-quality refractory filter material with the average particle size of 1.5mm and the true density of 2.8g/cm3The filter material of (2) is filled into the upper layer of the filter, and the filling height is 0.7 m.
The selected light refractory filter material is made from waste sprayed refractory material of an electric furnace, and the average particle size of the filter material is 2.5mm, and the true density of the filter material is 1.8g/cm3The filter material of (2) is filled into the upper layer of the filter, and the filling height is 1.5 m.
Before the filter material is used, 40mg/L of surfactant (nonylphenol polyoxyethylene ether OP-10: sodium dodecyl sulfate ═ 1:1) solution is added into a filter (tank), the filter material is submerged and soaked for 8 hours, backwashing is carried out every 1 hour for 10 minutes, the pressure of backwashing compressed air is 0.07MPa, and the strength of backwashing compressed air is 0.6m3/m2And min, performing activation treatment on the surface of the filter material.
The filter material for water treatment in the steel plant directly uses hot-rolling turbid circulating water in the washing and surface activation processes, and wastewater is discharged into the hot-rolling water treatment cyclone tank nearby, so that water resources are efficiently utilized. As the main component of the filter material is metal oxide, a very small amount of metal ions possibly enter the treated water in the use process, but the step of adding alkali for precipitation is commonly existed in a hot-rolling turbid circulating water treatment system, so the normal use of the filter material and the effluent quality are not influenced.
The waste water enters from the upper end of the filter, and the water quality is purified through interception and adsorption of the filter material, and the service life of the filter material reaches more than 3 years. The water quality indexes of inlet and outlet water of the filter are as follows:
example 2 influent suspension: 53.2 mg/L;
example 2 effluent suspension: 8.6 mg/L;
example 2 water and oil feed: 11.1 mg/L;
example 2 effluent oil part: 3.3 mg/L.
Comparative example 2:
the implementation conditions are similar to those of the above example 2, but the comparative example adopts a conventional filter material, gravel is filled into the bottom layer of the filter, the average particle size is 7mm, and the filling height is 0.4 m; quartz sand is filled into the middle layer of the filter, the average grain diameter is 1.25mm, and the filling height is 0.7 m; anthracite coal is loaded into the upper layer of the filter, the average grain diameter is 2.6mm, and the filling height is 1.4 m. Comparative example 2 the water quality index of the filter inlet water is the same as that of example 2, and the water quality index of the outlet water is as follows:
comparative example 2 effluent suspension: 9.8 mg/L;
comparative example 2 water and oil content: 3.9 mg/L.
Example 2 the water treatment effect is better than that of comparative example 2.
The above description of the embodiments and comparative examples is provided to facilitate understanding and application of the present invention by those of ordinary skill in the art. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments and the present invention can be applied to other embodiments without inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the contents of the present invention.
Claims (12)
1. The filter material for water treatment in the steel plant is characterized by being prepared by the following steps:
1) preparing materials:
selecting waste refractory materials of a steel plant for classification, crushing, screening and washing;
selecting a material with a true density of 1.4 or more and less than 2.5g/cm3Taking the product with the average particle size of 1.5-5 mm as a light refractory material filter material for later use; according to the mass percentage, the light refractory material filter material consists of 10-75% of alumina, 10-75% of silicon dioxide, 0-70% of magnesium oxide, 5-20% of a binder and 0-10% of impurities mainly containing oxides;
selecting a material with a true density of more than or equal to 2.5 and less than 3.2g/cm3Taking the product with the average particle size of 0.5-3 mm as a medium-quality refractory material filter material for later use; according to the mass percentage, the medium-quality refractory material filter material consists of 10-75% of alumina, 10-75% of silicon dioxide, 5-70% of magnesium oxide, 0-5% of calcium oxide, 0-5% of ferric oxide and 0-5% of impurities mainly comprising oxides;
selecting a material with a true density of 3.2g/cm or more3Taking the product with the average particle size of 4-10 mm as a heavy refractory material filter material for later use; according to the mass percentage, the heavy refractory filter material consists of 0-60% of zirconia, 0-60% of chromic oxide, 5-90% of alumina, 0-10% of silicon dioxide, 0-20% of magnesia and 0-10% of impurities which mainly comprise oxides;
2) filling the heavy refractory material filter material into the bottom layer of a filter container to serve as a supporting layer, filling the medium refractory material filter material into the middle layer of the filter container to serve as a second filter layer, and filling the light refractory material filter material into the upper layer of the filter container to serve as a first filter layer;
the volume percentage of the heavy refractory filter material, the medium refractory filter material and the light refractory filter material is 12-20%, 25-38% and 42-63%.
2. The steel and iron plant water treatment filter material of claim 1, wherein in step 2), the volume percentage of the heavy refractory filter material, the medium refractory filter material and the light refractory filter material is 16% to 28% to 56%.
3. The filter material for water treatment in steel and iron works according to claim 1, wherein the raw material of the filter material is selected from one or more of steel and iron works waste refractory materials including castable and spray coating; the raw material of the medium refractory material filter material is selected from one or more of waste refractory materials of steel plants including aluminum silicate and magnesium oxide; the raw material of the heavy refractory filter material is selected from one or more of heavy metal oxide containing zirconium, chromium and corundum and/or compact waste refractory material with low porosity.
4. The filter material for water treatment in the steel plant is characterized by being prepared by the following steps:
1) and preparing a material A:
selecting waste refractory materials of a steel plant to classify, crush, screen and wash according to the application and the physical and chemical properties;
selecting a material with a true density of 1.4 or more and less than 2.5g/cm3Taking the product with the average particle size of 1.5-5 mm as a light refractory material filter material for later use; according to the mass percentage, the light refractory material filter material consists of 10-75% of alumina, 10-75% of silicon dioxide, 0-70% of magnesium oxide, 5-20% of a binder and 0-10% of impurities mainly containing oxides;
selecting a material with a true density of more than or equal to 2.5 and less than 3.2g/cm3Taking the product with the average particle size of 0.5-3 mm as a medium-quality refractory material filter material for later use; according to the mass percentage, the medium-quality refractory material filter material consists of 10-75% of alumina, 10-75% of silicon dioxide, 5-70% of magnesium oxide, 0-5% of calcium oxide, 0-5% of ferric oxide and 0-5% of impurities mainly containing oxides;
2) preparing materials B:
selecting steel slag of a steel plant, crushing, screening and washing;
selecting a material with true density of more than 3.0g/cm3Taking the product with the average particle size of 4-10 mm as a steel slag filter material for later use; according to the mass percentage, the steel slag filter material consists of 30-60% of calcium oxide, 5-20% of ferric oxide, 5-20% of ferrous oxide, 5-15% of silicon dioxide, 0-10% of magnesium oxide and 0-10% of impurities mainly containing oxides;
3) putting the steel slag filter material into the bottom layer of a filter container to serve as a supporting layer, putting the medium-quality refractory material filter material into the middle layer of the filter container to serve as a second filter layer, and putting the light-weight refractory material filter material into the upper layer of the filter container to serve as a first filter layer;
the steel slag filter material, the medium-quality refractory material filter material and the light refractory material filter material are filled in a volume percentage of 12-20%, 25-38% and 42-63%.
5. The filter material for water treatment in steel and iron works as claimed in claim 4, wherein in step 3), the steel slag filter material, the medium-quality refractory filter material and the light-weight refractory filter material are filled in a volume percentage of 16%: 28%: 56%.
6. The filter material for water treatment in steel and iron works as claimed in claim 4, wherein the raw material of the filter material is selected from one or more of steel and iron works waste refractory materials including castable and spray coating; the raw material of the medium refractory material filter material is selected from one or more of waste refractory materials of steel plants, including aluminum silicate and magnesia; the steel slag filter material is made of converter steel slag and/or electric furnace steel slag.
7. The use of the filter material for water treatment in a steel plant according to claim 1, 3, 4 or 6, in wastewater treatment, comprising the step of performing a surface activation treatment before wastewater treatment using the filter material for water treatment in a steel plant:
adding 30-50 mg/L of surfactant solution into the filtering container, submerging the prepared water treatment filter material of the iron and steel plant, soaking for more than 8 hours, backwashing for 10-15 min every 1-2 hours along with compressed air, wherein the pressure of backwashing compressed air is 0.05-0.08 MPa, and the strength of backwashing compressed air is 0.5-0.8 m3/m2·min。
8. The use according to claim 7, wherein the surfactant is one or more of nonylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, alkanolamide and sodium alkylsulfonate.
9. The use according to claim 7, wherein the volume percentage of the lightweight refractory filter material in the filter vessel is positively correlated to the suspended matter and oil content of the wastewater being treated.
10. Use according to claim 7,
when the suspended matters in the treated wastewater are more than 100mg/L or the oil content is more than 15mg/L, the volume ratio of the light refractory material filter material to the medium refractory material filter material filled in the filter container is more than 2.3;
when the suspended matters in the treated wastewater are 40-100 mg/L or the oil content is 10-15 mg/L, the volume ratio of the light-weight refractory filter material to the medium-weight refractory filter material filled in the filter container is 2.0-2.3;
when the suspended matters in the treated wastewater are less than 40mg/L or the oil content is less than 10mg/L, the volume ratio of the light-weight refractory filter material and the medium-weight refractory filter material filled in the filter container is less than 2.0.
11. The use of claim 7, wherein the average particle size of the light and medium refractory filter material is positively correlated to the size of particulate contaminants in the wastewater being treated.
12. Use according to claim 11,
when the average particle size of suspended matters in the treated wastewater is less than 1 mu m, the average particle size of the selected light-weight refractory filter material is 1.5-2.0 mm, and the average particle size of the selected medium-weight refractory filter material is 0.5-1.0 mm;
when the average particle size of suspended matters in the treated wastewater is 1-6 mu m, the average particle size of the selected light-weight refractory filter material is 2.0-3.0 mm, and the average particle size of the selected medium-weight refractory filter material is 1.0-1.8 mm;
when the average particle size of suspended matters in the treated wastewater is greater than 6 mu m, the average particle size of the selected light-weight refractory filter material is 3.0-5.0 mm, and the average particle size of the selected medium-weight refractory filter material is 1.8-3.0 mm.
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| US4137162A (en) * | 1976-09-10 | 1979-01-30 | Nippon Oil Company, Ltd. | Method for treating waste waters |
| CN1594117A (en) * | 2004-07-08 | 2005-03-16 | 武汉理工大学 | Ceramic filtering material filter tank for water treatment |
| CN101092255A (en) * | 2007-05-23 | 2007-12-26 | 王福绵 | Technical method of applying filter material of ceramics granules to treating wastewater from iron and steel industry |
| CN101244867A (en) * | 2008-03-25 | 2008-08-20 | 华南理工大学 | Downflow double-layer filter material aerating biological filter and method for using the filter chamber to process raw water |
| CN103977636A (en) * | 2014-05-08 | 2014-08-13 | 常州大学 | Method for preparing water treatment filter material from waste red brick block |
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| US4137162A (en) * | 1976-09-10 | 1979-01-30 | Nippon Oil Company, Ltd. | Method for treating waste waters |
| CN1594117A (en) * | 2004-07-08 | 2005-03-16 | 武汉理工大学 | Ceramic filtering material filter tank for water treatment |
| CN101092255A (en) * | 2007-05-23 | 2007-12-26 | 王福绵 | Technical method of applying filter material of ceramics granules to treating wastewater from iron and steel industry |
| CN101244867A (en) * | 2008-03-25 | 2008-08-20 | 华南理工大学 | Downflow double-layer filter material aerating biological filter and method for using the filter chamber to process raw water |
| CN103977636A (en) * | 2014-05-08 | 2014-08-13 | 常州大学 | Method for preparing water treatment filter material from waste red brick block |
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