WO2020238479A1 - Improved process for wet detoxification of hexavalent-chromium-containing waste residue or hexavalent chromium polluted soil - Google Patents
Improved process for wet detoxification of hexavalent-chromium-containing waste residue or hexavalent chromium polluted soil Download PDFInfo
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- WO2020238479A1 WO2020238479A1 PCT/CN2020/085701 CN2020085701W WO2020238479A1 WO 2020238479 A1 WO2020238479 A1 WO 2020238479A1 CN 2020085701 W CN2020085701 W CN 2020085701W WO 2020238479 A1 WO2020238479 A1 WO 2020238479A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- the present invention relates to the technical field of pollution control, in particular to an improved process for wet detoxification of hexavalent chromium-containing waste residue or hexavalent chromium-contaminated soil, so as to realize the harmless treatment of hexavalent chromium-containing pollutants.
- the waste slag containing hexavalent chromium has been harmlessly treated.
- the soil of the chromium slag deposits has also been seriously polluted.
- the site contains hexavalent chromium waste residue mixed with contaminated soil.
- the harmless treatment of the hexavalent chromium-containing waste residue and the heavily polluted soil of hexavalent chromium is an important link in the comprehensive treatment of hexavalent chromium-contaminated sites.
- the reducing agent and the acidified hexavalent chromium slurry are matured in a mixing tank. If the aging time is not long enough, it will be unfavorable for the reduction of hexavalent chromium. If the aging time is too long, energy consumption will be high on the one hand, Reduce the efficiency of the wet detoxification system.
- the present invention provides an improved process for wet detoxification of hexavalent chromium-containing waste residue or hexavalent chromium-contaminated soil to improve the thoroughness and long-term effectiveness of the wet detoxification.
- the present invention discloses an improved process for wet detoxification of hexavalent chromium-containing waste residue or hexavalent chromium-contaminated soil, including:
- the hexavalent chromium-containing waste residue or hexavalent chromium-contaminated soil is subjected to wet grinding treatment to obtain a slurry;
- the trivalent chromium slurry after the reduction reaction is subjected to solid-liquid separation, the separated filtrate is partially recycled for acidification treatment, and the separated filter cake is subjected to external curing treatment.
- the wet grinding treatment of waste slag containing hexavalent chromium or soil contaminated with hexavalent chromium to obtain a slurry comprising:
- the hexavalent chromium waste residue or hexavalent chromium contaminated soil that has been sieved and ground is put into a wet milling device, and it is ground to 100-150 meshes to obtain the slurry.
- the said conveying the said slurry into the sulfuric acid-acetic acid mixed liquid for acidification treatment to obtain the slurry comprising:
- the slurry is gradually transported to the acidification reaction tank, stirred and mixed with the sulfuric acid-acetic acid mixture in the acidification reaction tank, so that the pH of the slurry is maintained at 5-6 and aged for 5-6 hours.
- the mass percentage of the sulfuric acid is 10%-20%
- the mass percentage of the acetic acid is 5%-10%
- the volume ratio of the sulfuric acid to the acetic acid is 1:1-3:1.
- the said transferring the slurry to the reducing agent solution to carry out a reduction reaction, so that the hexavalent chromium in the slurry is converted into trivalent chromium; comprising:
- the slurry is gradually transported to the reduction reaction tank, stirred and mixed with the reducing agent solution in the reduction reaction tank, and the reaction time is 5-8 hours to convert the hexavalent chromium in the slurry into trivalent chromium.
- the reducing agent solution is a solution of ferrous sulfate and sodium metabisulfite dissolved in water, and the molar ratio of the ferrous sulfate to sodium metabisulfite is 4:1 to 6:1.
- the concentration of ferrous sulfate is 15%-20%.
- the trivalent chromium slurry after the reduction reaction is subjected to solid-liquid separation, the separated filtrate is partially recycled for acidification treatment, and the separated filter cake is subjected to external curing treatment; including:
- the separated filtrate enters the filtrate tank, and a part of the filtrate in the filtrate tank is recycled to the acidification reaction tank for acidification treatment; the separated filtration
- the cake pile is placed in the curing tank for airtight curing.
- the filter cake is cured in a curing tank for 7-15 days. During the curing, the filter cake is sprayed with filtrate to ensure that the filter cake remains moist.
- the curing tank is a circular tank with HDPE film and impermeable cement anti-seepage treatment. It is located 2 to 3 meters below the ground and has a diameter of 4 to 6 meters. The top is covered with HDPE film and the center is at the top. The location is equipped with a nozzle for spraying filtrate, and the nozzle is connected to the filtrate tank through a pipe.
- the wet-milled slurry is gradually added to the sulfuric acid-acetic acid solution, so as to promote the full contact between the slurry and the acid solution, and maintain a microenvironment that is conducive to the acidification reaction on the reaction interface;
- the present invention reduces the generation of calcium sulfate precipitation in the wet detoxification process by adding acetic acid, thereby avoiding calcium sulfate precipitation to wrap the hexavalent chromium pollutant particles and improving the dissolution of hexavalent chromium in the acid leaching stage;
- the acidified slurry is gradually added to the reducing agent solution, thereby promoting full contact between the hexavalent chromium pollutant particles and the reducing agent, and maintaining a microenvironment that is conducive to the occurrence of the reduction reaction on the reaction interface;
- the present invention places the separated filter cake in an external curing tank for curing, reduces the aging time in the reduction reaction tank, improves the production efficiency of the wet detoxification system and prolongs the reaction time of hexavalent chromium and the reducing agent. Conducive to the complete reduction of hexavalent chromium to trivalent chromium.
- Figure 1 is a flow chart of an improved process for wet detoxification of hexavalent chromium-containing waste residue or hexavalent chromium-contaminated soil disclosed in an embodiment of the present invention.
- the present invention provides an improved process for wet detoxification of hexavalent chromium-containing waste residue or hexavalent chromium-contaminated soil, including:
- the hexavalent chromium waste residue or hexavalent chromium contaminated soil that has been sieved and ground is put into a wet grinding equipment, and it is ground to 100-150 mesh to obtain a slurry.
- the sulfuric acid-acetic acid mixture First add the sulfuric acid-acetic acid mixture to the acidification reaction tank, and then gradually transport the slurry to the acidification reaction tank for acidification, so that the pH of the slurry is maintained at 5-6 and aged for 5-6 hours; among them, the mass percentage of sulfuric acid It is 10% to 20%, the mass percentage of acetic acid is 5% to 10%, and the volume ratio of sulfuric acid to acetic acid is 1:1 to 3:1.
- the principle of the addition sequence of the acidification process of the present invention is: different from the traditional wet detoxification process, the acid solution is not added to the slag slurry, but the slag slurry is gradually added to the acid solution to make the slag slurry and the acid solution have sufficient To ensure that the microenvironment on the reaction interface is most conducive to the acidification of the slurry.
- the principle of selecting the sulfuric acid-acetic acid mixture for acidification in the present invention is:
- the solubility of calcium acetate at 20°C is about 340g/L, which facilitates the stirring of the slurry and avoids the problem that calcium sulfate precipitation can wrap the chromium slag particles and cannot react with acid. .
- the slurry is gradually transported to the reduction reaction tank and stirred and mixed with the reducing agent solution.
- the reaction time is 5-8 hours, and the hexavalent chromium in the slurry is converted into trivalent chromium; wherein the reducing agent solution is sulfurous acid dissolved in water
- the molar ratio of iron and sodium metabisulfite solution, ferrous sulfate and sodium metabisulfite is 4:1 to 6:1, and the concentration of ferrous sulfate in the prepared solution is 15% to 20%.
- the hexavalent chromium-containing waste residue or hexavalent chromium-contaminated soil slurry is added to the reducing agent In the solution, make the slurry and the reducing agent have sufficient contact to ensure that the reaction interface is the most favorable micro-environment for the reduction of hexavalent chromium.
- the separated filtrate enters the filtrate tank, and a part of the filtrate in the filtrate tank is recycled to the acidification reaction tank for acidification treatment; the separated filter cake stack Place it in the curing tank for airtight curing; among them, the filter cake is cured in the curing tank for 7-15 days. During the curing period, the filter cake is sprayed with the filtrate to ensure that the filter cake remains moist.
- the curing tank is a circular tank with HDPE membrane and impermeable cement anti-seepage treatment. It is located 2 to 3 meters below the ground and has a diameter of 4 to 6 meters.
- the top is covered with HDPE membrane, and the top center is equipped with a nozzle for spraying filtrate. The nozzle is connected to the filtrate tank through a pipe.
- the filter cake after reduction reaction and dehydration treatment needs to be cured in the curing tank for 7-15 days, thereby reducing the aging time in the reduction reaction tank, improving the production efficiency of the wet detoxification system and prolonging the reaction of hexavalent chromium with the reducing agent Time is conducive to the complete reduction of hexavalent chromium to trivalent chromium.
- the mixture of chromium residue and soil at the original site of a chromium salt production enterprise in Baiyin, Gansu, has a hexavalent chromium content of 2000-3000mg/kg.
- the acidified slurry is gradually pumped to the reduction reaction tank and mixed with the reducing agent.
- the pumping takes 2 hours.
- the ratio of the reducing agent aqueous solution in the reduction reaction tank is as follows: the molar ratio of ferrous sulfate to sodium metabisulfite is 6:1, the concentration of ferrous sulfate in the reducing agent aqueous solution is 15%, and the reaction time is 5 hours;
- the filter cake is cured in a curing tank (2 meters deep and 4 meters in diameter). During the curing, the filter cake is sprayed with the filtrate in the filtrate storage tank to ensure that the filter cake remains moist. After 7 days, take 3 mixed samples in the curing tank, and the contents of hexavalent chromium were detected as: 0.14mg/kg, 0.20mg/L, 0.12mg/L; 1 month later, take the detoxified residue In the three mixed samples, the contents of hexavalent chromium detected were: 0.13mg/kg, 0.17mg/L, 0.18mg/L.
- the mixture of chromium residue and soil at the original site of a chromium salt production enterprise in Zhangye, Gansu, has a hexavalent chromium content of 4000-5000mg/kg.
- the acidified slurry is gradually pumped to the reduction reaction tank and mixed with the reducing agent.
- the pumping takes 2 hours.
- the ratio of the reducing agent aqueous solution in the reduction reaction tank is as follows: the molar ratio of ferrous sulfate to sodium metabisulfite is 4:1, the concentration of ferrous sulfate in the reducing agent aqueous solution is 20%, and the reaction time is 8 hours;
- the filter cake is cured in a curing tank (3 meters deep and 5 meters in diameter). During the curing, the filter cake is sprayed with the filtrate in the filtrate storage tank to ensure that the filter cake remains moist.
- three mixed samples were taken in the curing tank, and the contents of hexavalent chromium were detected as: 0.25mg/kg, 0.18mg/L, 0.19mg/L.
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Abstract
Description
Claims (9)
- 一种用于含六价铬废渣或六价铬污染土壤湿法解毒的改进工艺,其特征在于,包括:An improved process for wet detoxification of hexavalent chromium-containing waste residue or hexavalent chromium-contaminated soil, which is characterized in that it comprises:将含六价铬废渣或六价铬污染土壤进行湿磨处理,得到渣浆;The hexavalent chromium-containing waste residue or hexavalent chromium-contaminated soil is subjected to wet grinding treatment to obtain a slurry;将所述渣浆输送至硫酸-醋酸混合液中进行酸化处理,得到料浆;Transporting the slurry to the sulfuric acid-acetic acid mixed liquid for acidification treatment to obtain a slurry;将所述料浆输送至还原剂溶液中进行还原反应,使所述料浆中的六价铬转化为三价铬;Transporting the slurry to the reducing agent solution for reduction reaction, so that the hexavalent chromium in the slurry is converted into trivalent chromium;将还原反应后的三价铬料浆进行固液分离,分离后的滤液部分循环用于酸化处理,分离后的滤饼进行外部养护处理。The trivalent chromium slurry after the reduction reaction is subjected to solid-liquid separation, the separated filtrate is partially recycled for acidification treatment, and the separated filter cake is subjected to external curing treatment.
- 如权利要求1所述的改进工艺,其特征在于,所述将含六价铬废渣或六价铬污染土壤进行湿磨处理,得到渣浆;包括:The improved process according to claim 1, wherein the wet grinding treatment is performed on waste slag containing hexavalent chromium or soil contaminated with hexavalent chromium to obtain a slurry; comprising:将经过筛分磨碎的六价铬废渣或六价铬污染土壤置入湿磨设备,将其磨碎至100~150目,得到所述渣浆。The hexavalent chromium waste residue or hexavalent chromium contaminated soil that has been sieved and ground is put into a wet milling device, and it is ground to 100-150 meshes to obtain the slurry.
- 如权利要求1所述的改进工艺,其特征在于,所述将所述渣浆输送至硫酸-醋酸混合液中进行酸化处理,得到料浆;包括:The improved process according to claim 1, characterized in that said transporting said slurry to a sulfuric acid-acetic acid mixture for acidification treatment to obtain slurry; comprising:将所述渣浆逐渐输送到酸化反应罐中,与酸化反应罐内的硫酸-醋酸混合液搅拌混合,使所述料浆的pH维持在5~6,老化5~6小时。The slurry is gradually transported to the acidification reaction tank, stirred and mixed with the sulfuric acid-acetic acid mixture in the acidification reaction tank, so that the pH of the slurry is maintained at 5-6 and aged for 5-6 hours.
- 如权利要求3所述的改进工艺,其特征在于,所述硫酸的质量百分数为10%~20%,所述醋酸的质量百分数为5%~10%,所述硫酸与醋酸的体积比为1:1~3:1。The improved process according to claim 3, wherein the mass percentage of the sulfuric acid is 10%-20%, the mass percentage of the acetic acid is 5%-10%, and the volume ratio of the sulfuric acid to acetic acid is 1. :1~3:1.
- 如权利要求1所述的改进工艺,其特征在于,所述将所述料浆输送至还原剂溶液中进行还原反应,使所述料浆中的六价铬转化为三价铬;包括:5. The improved process according to claim 1, wherein said transferring said slurry to a reducing agent solution for reduction reaction to convert hexavalent chromium in said slurry into trivalent chromium; comprising:将所述料浆逐渐输送到还原反应罐中,与还原反应罐内的还原剂溶液搅拌混合,反应时间5-8小时,将所述料浆中的六价铬转化为三价铬。The slurry is gradually transported to the reduction reaction tank, stirred and mixed with the reducing agent solution in the reduction reaction tank, and the reaction time is 5-8 hours to convert the hexavalent chromium in the slurry into trivalent chromium.
- 如权利要求5所述的改进工艺,其特征在于,所述还原剂溶液为溶解在水中的硫酸亚铁与焦亚硫酸钠溶液,所述硫酸亚铁与焦亚硫酸钠的摩尔比为4:1~6:1,配置好的溶液中硫酸亚铁的浓度为15%~20%。The improved process according to claim 5, wherein the reducing agent solution is a solution of ferrous sulfate and sodium metabisulfite dissolved in water, and the molar ratio of the ferrous sulfate to sodium metabisulfite is 4:1 to 6: 1. The concentration of ferrous sulfate in the prepared solution is 15%-20%.
- 如权利要求1所述的改进工艺,其特征在于,所述将还原反应后的三价铬料浆进行固液分离,分离后的滤液部分循环用于酸化处理,分离后的滤饼进行外部养护处理;包括:The improved process of claim 1, wherein the trivalent chromium slurry after the reduction reaction is subjected to solid-liquid separation, the separated filtrate is partially recycled for acidification treatment, and the separated filter cake is externally cured Processing; including:将还原反应后的料浆泵入板框压滤机进行固液分离,分离后的滤液进入 滤液罐,所述滤液罐中的一部分滤液循环至酸化反应罐,用于酸化处理;分离后的滤饼堆置于养护槽内进行密闭养护。Pump the reduction reaction slurry into a plate and frame filter press for solid-liquid separation, the separated filtrate enters the filtrate tank, and a part of the filtrate in the filtrate tank is recycled to the acidification reaction tank for acidification treatment; the separated filtration The cake pile is placed in the curing tank for airtight curing.
- 如权利要求7所述的改进工艺,其特征在于,还包括:The improved process according to claim 7, characterized in that it further comprises:所述滤饼在养护槽内养护7~15天,养护期间,用滤液喷洒滤饼,确保滤饼保持湿润状态。The filter cake is cured in the curing tank for 7-15 days. During the curing, the filter cake is sprayed with the filtrate to ensure that the filter cake remains moist.
- 如权利要求8所述的改进工艺,其特征在于,所述养护槽是经过HDPE膜和抗渗水泥防渗处理的圆形槽,位于地面下2~3米,直径4~6米,顶部覆盖HDPE膜,并在顶部中心位置配备有用于喷洒滤液的喷头,喷头通过管道与滤液罐相连。The improved process according to claim 8, characterized in that, the curing tank is a circular tank with HDPE film and impermeable cement anti-seepage treatment. It is located 2 to 3 meters below the ground and has a diameter of 4 to 6 meters. HDPE membrane, and is equipped with a spray head for spraying filtrate at the top center, which is connected to the filtrate tank through a pipe.
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CN111607401A (en) * | 2020-05-27 | 2020-09-01 | 重庆大学 | Repairing agent for in-situ repairing hexavalent chromium pollution and preparation method and application thereof |
CN115889435A (en) * | 2022-11-07 | 2023-04-04 | 中冶南方都市环保工程技术股份有限公司 | Heap leaching reduction repair method for high-concentration Cr (VI) polluted muck |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102614620A (en) * | 2012-03-15 | 2012-08-01 | 中国科学院过程工程研究所 | Wet detoxification method of hexavalent chromium contained alkali waste residues |
JP2013116465A (en) * | 2011-10-31 | 2013-06-13 | Jfe Steel Corp | Material for reducing harmful element, and method for reducing harmful element |
KR101349073B1 (en) * | 2013-08-30 | 2014-01-09 | 한국지질자원연구원 | Heavy metal-contaminated soil washing method using soil washing solution including siderophore and heavy metal-contaminated soil washing device |
CN103894406A (en) * | 2014-03-18 | 2014-07-02 | 江苏维尔利环保科技股份有限公司 | Method for restoring polluted chromium-containing soil by combining wet detoxification and stabilization |
CN103071670B (en) * | 2013-01-24 | 2016-03-16 | 韩清洁 | A kind of equipment for chromium slag contaminated soil Detoxified treatment |
CN108723071A (en) * | 2018-05-22 | 2018-11-02 | 河北省冀信环保科技有限公司 | One kind harmless treatment device containing chromium soil and processing method |
CN110125164A (en) * | 2019-05-29 | 2019-08-16 | 北京高能时代环境技术股份有限公司 | Improvement technique for waste residue containing Cr VI or hexavalent chromium polluted soil wet method detoxifcation |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102189093B (en) * | 2010-03-09 | 2015-02-04 | 刘杰 | Method for detoxicating chromium residues and comprehensive utilization of detoxicated chromium residues |
CN103586273A (en) * | 2012-08-14 | 2014-02-19 | 江苏盖亚环境工程有限公司 | Method for treating contaminated soil by utilizing wedge-shape high-strength isolated leaching reaction tank |
CN103934256B (en) * | 2014-04-21 | 2019-06-04 | 江苏维尔利环保科技股份有限公司 | Chromium slag and wet method detoxifcation method containing chromium pollutant |
CN204148233U (en) * | 2014-09-23 | 2015-02-11 | 中科华南(厦门)环保有限公司 | A kind of modular optimizes integrated-type high chromium concentration contaminated soil remediation system adopting recirculating |
CN109304356A (en) * | 2018-11-07 | 2019-02-05 | 长沙汇聚环境技术有限公司 | A kind of method of zinc and organic material contaminated soil reparation |
-
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Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013116465A (en) * | 2011-10-31 | 2013-06-13 | Jfe Steel Corp | Material for reducing harmful element, and method for reducing harmful element |
CN102614620A (en) * | 2012-03-15 | 2012-08-01 | 中国科学院过程工程研究所 | Wet detoxification method of hexavalent chromium contained alkali waste residues |
CN103071670B (en) * | 2013-01-24 | 2016-03-16 | 韩清洁 | A kind of equipment for chromium slag contaminated soil Detoxified treatment |
KR101349073B1 (en) * | 2013-08-30 | 2014-01-09 | 한국지질자원연구원 | Heavy metal-contaminated soil washing method using soil washing solution including siderophore and heavy metal-contaminated soil washing device |
CN103894406A (en) * | 2014-03-18 | 2014-07-02 | 江苏维尔利环保科技股份有限公司 | Method for restoring polluted chromium-containing soil by combining wet detoxification and stabilization |
CN108723071A (en) * | 2018-05-22 | 2018-11-02 | 河北省冀信环保科技有限公司 | One kind harmless treatment device containing chromium soil and processing method |
CN110125164A (en) * | 2019-05-29 | 2019-08-16 | 北京高能时代环境技术股份有限公司 | Improvement technique for waste residue containing Cr VI or hexavalent chromium polluted soil wet method detoxifcation |
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