CN115745436A - Method for cooperatively treating multiple heavy metal combined contaminated soil by using cement kiln - Google Patents
Method for cooperatively treating multiple heavy metal combined contaminated soil by using cement kiln Download PDFInfo
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- CN115745436A CN115745436A CN202211465761.5A CN202211465761A CN115745436A CN 115745436 A CN115745436 A CN 115745436A CN 202211465761 A CN202211465761 A CN 202211465761A CN 115745436 A CN115745436 A CN 115745436A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention discloses a method for cooperatively treating multiple heavy metal compound contaminated soil by a cement kiln, which comprises the following steps: step one, when the device is used, limestone and sandstone are placed in a drying box to be dried, after the drying, polluted soil, the dried limestone and the sandstone are placed in a crusher together to be crushed, and after the crushing, the crushed mixture is added into a low-speed mixer to be stirred and mixed. The air pump and the filter are matched with each other, so that generated high-temperature gas can be effectively recycled when the air pump and the filter are used, the utilization rate of the whole method is effectively ensured, the utilization rate of the calcined gas is further ensured after calcination is carried out, and meanwhile, the treatment effect on heavy metals can be effectively improved when the air pump and the filter are used, so that the mixing effect between the air pump and cement is better.
Description
Technical Field
The invention relates to the technical field related to soil heavy metal treatment, in particular to a method for treating multiple heavy metal compound contaminated soil by using a cement kiln in a synergistic manner.
Background
The soil inorganic pollutants are relatively prominent in heavy metals, and the heavy metals are easy to accumulate due to the fact that the heavy metals cannot be decomposed by soil microorganisms and are converted into methyl compounds with higher toxicity, even some of the heavy metals are accumulated in a human body through a food chain in harmful concentration and seriously harm the health of the human body, when the soil heavy metals are treated, a cement kiln cooperative treatment method is usually adopted, so that the soil with the heavy metals is favorably mixed into cement for treatment and use, when the soil is treated, because the cement is composed of limestone, sandstone iron powder and coal ash, when limestone and sandstone are processed, the soil needs to be dried, and when the soil is continuously formed, the soil needs to be formed through high-temperature calcination, the gas after high-temperature calcination is inconvenient to recycle, and the treatment cost of the whole treatment method is increased.
Disclosure of Invention
The invention aims to provide a method for cooperatively treating multiple heavy metal compound contaminated soil by using a cement kiln so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a method for cooperatively treating multiple heavy metal compound contaminated soil by a cement kiln comprises the following steps:
step one, when the sand crusher is used, placing limestone and sandstone into a drying box for drying, after drying, placing polluted soil, the dried limestone and sandstone into a crusher together for crushing treatment, after crushing, adding the crushed mixture into a low-speed mixer for stirring and mixing, and adding a proper amount of iron powder and fly ash while stirring and mixing;
step two, after mixing, placing the mixture into a material storage tank for storage, simultaneously placing the cement curing matrix and tap water into a low-speed mixer for mixing, adding the mixture into the material storage tank for standing after mixing, so that the mixture in the step one is mixed with the added cement curing matrix and tap water for standing, and the treatment effect is ensured;
after standing, adding the mixture obtained in the third step into a flour mill together for milling, so that the crushing effect of the mixture is better, and after milling, continuously mixing and stirring the mixture through a high-speed mixer, so that the mixing effect of the mixture is further improved;
step four, adding the mixture obtained in the step three into a rotary kiln for high-temperature calcination, then placing the calcined cement into a cooling chamber for cooling, and obtaining the final clinker after cooling;
and step five, extracting high-temperature air generated by calcination in the rotary kiln by starting the air extraction pump, filtering the high-temperature air by using the filter after extraction, and conveying the filtered air into the drying box, so that the limestone and the sandstone are conveniently dried subsequently, the utilization of energy in the whole treatment method is effectively improved, and then the material mixture filtered by the filter is conveyed into the rotary kiln again for calcination and molding.
Further, the rotating speed of the low-speed mixer in the first step and the second step is set to be 500r/min, and the mixing and stirring time is set to be 10 to 20min.
Further, when the material storage tank in the second step is in standing, the standing time is set to be 30-50 min.
Further, the rotation speed of the high-speed mixer in the third step is set to 2000r/min, and the mixing and stirring time is set to 20 to 30min.
Further, the working time of the pulverizer in the third step is set to be 20 to 30min.
Further, the cement solidification matrix is formed by mixing municipal waste incineration fly ash, an aluminum-containing additive and a calcium control agent.
Furthermore, manganese oxide and iron oxide powder can be added in the third step, so that the solid forming effect is ensured.
Furthermore, lime powder can be added into the rotary kiln and the cooling chamber in the fourth step, so that the molding during calcining and cooling is ensured.
Compared with the prior art, the invention has the following beneficial effects:
(1) The air pump and the filter are matched with each other, so that generated high-temperature gas can be effectively recycled when the air pump and the filter are used, the utilization rate of the whole method is effectively ensured, the utilization rate of the gas after calcination is ensured, and meanwhile, the treatment effect on heavy metals can be effectively improved when the air pump and the filter are used, so that the mixing effect between the air pump and cement is better.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the steps of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 and 2, the present invention provides a technical solution: a method for cooperatively treating multiple heavy metal compound contaminated soil by a cement kiln comprises the following steps:
step one, when in use, placing limestone and sandstone into a drying box for drying, after drying, placing polluted soil, dried limestone and sandstone into a crusher together for crushing treatment, after crushing, adding the crushed mixture into a low-speed mixer for stirring and mixing, and adding a proper amount of iron powder and fly ash while stirring and mixing;
step two, after mixing, placing the mixture into a material storage tank for storage, simultaneously placing the cement curing matrix and tap water into a low-speed mixer for mixing, adding the mixture into the material storage tank for standing after mixing, so that the mixture in the step one is mixed with the added cement curing matrix and tap water for standing, and the treatment effect is ensured;
step three, after standing, adding the mixture obtained in the step three into a flour mill together for milling, so that the crushing effect of the mixture is better, and after milling, continuously mixing and stirring the mixture through a high-speed mixer, so that the mixing effect of the mixture is further improved;
step four, adding the mixture obtained in the step three into a rotary kiln for high-temperature calcination, then placing the calcined cement into a cooling chamber for cooling, and obtaining the final clinker after cooling;
and step five, extracting high-temperature air generated by calcination in the rotary kiln by starting the air extraction pump, filtering the high-temperature air by using the filter after extraction, and conveying the filtered air into the drying box, so that the limestone and the sandstone are conveniently dried subsequently, the utilization of energy in the whole treatment method is effectively improved, and then the material mixture filtered by the filter is conveyed into the rotary kiln again for calcination and molding.
Specifically, the rotating speed of the low-speed mixer in the first step and the second step is set to be 500r/min, the mixing and stirring time is set to be 10-20 min, and when the mixer is used, the preliminary mixing of materials is effectively guaranteed through the setting.
Specifically, when the material storage tank in the second step is in standing, the standing time is set to be 30-50 min, and through the setting, the cement solidification matrix and tap water can be in full contact with the material.
Specifically, the rotating speed of the high-speed mixer in the third step is set to 2000r/min, the mixing and stirring time is set to 20-30 min, and through the setting, the mixing effect during the secondary mixing of the materials is effectively guaranteed, so that the subsequent calcining and forming are facilitated.
Specifically, operating time when the crocus of milling machine in the third step sets up to 20 to 30min, through above-mentioned setting for when carrying out the crocus, the effectual effect of guaranteeing the crocus.
The cement solidification matrix is formed by mixing municipal waste incineration fly ash, an aluminum-containing additive and a calcium control agent, and through the arrangement, the mixing effect of heavy metal components and cement in soil is ensured when heavy metals in the soil are treated.
Specifically, manganese oxide and iron oxide powder can be added in step three, so that the solid-state forming effect is guaranteed, and by adding the materials, when the powder is milled, the forming effect of the powder is guaranteed due to the drying of the powder when the powder is formed.
In the fourth step, lime powder can be added into the rotary kiln and the cooling chamber, so that the forming during calcining and cooling is ensured.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for cooperatively treating multiple heavy metal compound contaminated soil by a cement kiln is characterized by comprising the following steps: the method comprises the following steps:
step one, when in use, placing limestone and sandstone into a drying box for drying, after drying, placing polluted soil, dried limestone and sandstone into a crusher together for crushing treatment, after crushing, adding the crushed mixture into a low-speed mixer for stirring and mixing, and adding a proper amount of iron powder and fly ash while stirring and mixing;
step two, after mixing, placing the mixture into a material storage tank for storage, simultaneously placing the cement curing matrix and tap water into a low-speed mixer for mixing, adding the mixture into the material storage tank for standing after mixing, so that the mixture in the step one is mixed with the added cement curing matrix and tap water for standing, and the treatment effect is ensured;
step three, after standing, adding the mixture obtained in the step three into a flour mill together for milling, so that the crushing effect of the mixture is better, and after milling, continuously mixing and stirring the mixture through a high-speed mixer, so that the mixing effect of the mixture is further improved;
step four, adding the mixture obtained in the step three into a rotary kiln for high-temperature calcination, then placing the calcined cement into a cooling chamber for cooling, and obtaining the final clinker after cooling;
and step five, extracting high-temperature air generated by calcination in the rotary kiln by starting the air extraction pump, filtering the high-temperature air by using the filter after extraction, and conveying the filtered air into the drying box, so that the limestone and the sandstone are conveniently dried subsequently, the utilization of energy in the whole treatment method is effectively improved, and then the material mixture filtered by the filter is conveyed into the rotary kiln again for calcination and molding.
2. The method for the cooperative treatment of the soil polluted by multiple heavy metals by the cement kiln according to claim 1, wherein the method comprises the following steps: the rotating speed of the low-speed mixer in the first step and the second step is set to be 500r/min, and the mixing and stirring time is set to be 10-20 min.
3. The method for the cooperative treatment of the soil polluted by multiple heavy metals by the cement kiln according to claim 1, wherein the method comprises the following steps: and when the material storage tank in the step two is in standing, the standing time is set to be 30-50 min.
4. The method for the cooperative treatment of the soil polluted by multiple heavy metals by the cement kiln according to claim 1, wherein the method comprises the following steps: the rotating speed of the high-speed mixer in the third step is set to be 2000r/min, and the mixing and stirring time is set to be 20-30 min.
5. The method for the cooperative treatment of the soil polluted by multiple heavy metals by the cement kiln according to claim 1, wherein the method comprises the following steps: and the working time of the pulverizer in the third step is set to be 20-30 min.
6. The method for the cooperative treatment of the soil polluted by multiple heavy metals by the cement kiln according to claim 1, wherein the method comprises the following steps: the cement solidification matrix is formed by mixing municipal waste incineration fly ash, an aluminum-containing additive and a calcium control agent.
7. The method for the cooperative treatment of the soil polluted by multiple heavy metals by the cement kiln according to claim 1, wherein the method comprises the following steps: manganese oxide and iron oxide powder can be added in the third step, so that the solid forming effect is ensured.
8. The method for the cooperative treatment of the soil polluted by multiple heavy metals by the cement kiln according to claim 1, wherein the method comprises the following steps: in the fourth step, lime powder can be added into the rotary kiln and the cooling chamber, so that the molding during calcining and cooling is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211465761.5A CN115745436A (en) | 2022-11-22 | 2022-11-22 | Method for cooperatively treating multiple heavy metal combined contaminated soil by using cement kiln |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211465761.5A CN115745436A (en) | 2022-11-22 | 2022-11-22 | Method for cooperatively treating multiple heavy metal combined contaminated soil by using cement kiln |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107204A (en) * | 2009-12-23 | 2011-06-29 | 湖南布鲁斯凯环保科技发展有限公司 | Innocent treatment process for industrial heavy metal waste residue by utilizing treating waste with waste |
| CN110683776A (en) * | 2019-11-14 | 2020-01-14 | 北京城建北方集团有限公司 | Method for treating polluted soil by co-processing of cement kilns |
| CN210741028U (en) * | 2019-09-10 | 2020-06-12 | 青海盐湖工业股份有限公司 | System for utilize cement manufacture waste heat to carry out material drying |
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- 2022-11-22 CN CN202211465761.5A patent/CN115745436A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107204A (en) * | 2009-12-23 | 2011-06-29 | 湖南布鲁斯凯环保科技发展有限公司 | Innocent treatment process for industrial heavy metal waste residue by utilizing treating waste with waste |
| CN210741028U (en) * | 2019-09-10 | 2020-06-12 | 青海盐湖工业股份有限公司 | System for utilize cement manufacture waste heat to carry out material drying |
| CN110683776A (en) * | 2019-11-14 | 2020-01-14 | 北京城建北方集团有限公司 | Method for treating polluted soil by co-processing of cement kilns |
Non-Patent Citations (1)
| Title |
|---|
| 马秀琴等: "我国钢铁与水泥行业碳排放核查技术与低碳技术", vol. 1, 中国环境科学出版社, pages: 307 * |
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