CN111020237A - Method for recovering waste mercury acetate reagent - Google Patents
Method for recovering waste mercury acetate reagent Download PDFInfo
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- CN111020237A CN111020237A CN201911248992.9A CN201911248992A CN111020237A CN 111020237 A CN111020237 A CN 111020237A CN 201911248992 A CN201911248992 A CN 201911248992A CN 111020237 A CN111020237 A CN 111020237A
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- mercury
- mercuric
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- acetate reagent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B43/00—Obtaining mercury
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a method for recovering a waste mercuric acetate reagent, which comprises the steps of carrying out chemical decomposition reaction on mercuric acetate and a sodium hydroxide solution under the condition of hot melting to obtain a mercuric carbonate precipitate, drying and heating the mercuric carbonate precipitate after separation to obtain mercuric oxide, and carrying out pyrogenic process to the mercuric oxide precipitate to recover elemental mercury. Meanwhile, the produced mercury-containing waste gas is condensed and subjected to multi-stage adsorption treatment and emission up to the standard, and the wastewater is subjected to precipitation treatment and emission up to the standard. The method has the advantages of simple operation, low treatment cost, average mercury recovery rate of over 99 percent, simple process, low cost, good economy and the like compared with a solidification landfill method.
Description
Technical Field
The invention relates to the technical field of a waste mercury acetate reagent recovery method, in particular to a mercury-containing waste resource recovery method, and belongs to the technical field of mercury wet regeneration.
Background
In recent years, the national emphasis on the prevention and control of heavy metal pollution is increasing, and people pay more and more attention to the prevention and control of mercury pollution due to the effective notice of 'water guarantee about mercury' issued by the country in 8 months in 2017, and the pressure on the prevention and control of mercury pollution in the mercury-related industry is increasing. Particularly, the mercury smelting industry is strictly regulated by related national departments, and the industry faces huge environmental protection pressure.
At present, the waste mercury-containing reagent is treated by adopting a curing and burying technology in China, and the technology mainly has the problems of large consumption of a curing stabilizer, no resource recovery and the like.
In recent years, most of the domestic and foreign treatment and disposal of mercury-containing reagents are solidification landfill technologies, such as "a mercury-containing reagent waste stabilization and solidification disposal process" (application publication No. CN 108687114 a). The technology has a certain curing and stabilizing effect on the treatment of the waste mercury-containing reagent, is suitable for the treatment and disposal of various waste mercury-containing reagents, but has the problems of complex process, high treatment cost, certain landfill cost needing to be paid and the like, and is difficult to meet the actual requirements of waste production units.
The method has good application value in recovering metallic mercury from waste mercury-containing reagent by wet extraction technology, and the mercury recovery rate can reach more than 99% by adding sodium hydroxide and reaction raw materials and controlling reaction temperature and time.
Disclosure of Invention
The invention provides a method for recovering a waste mercury acetate reagent, which aims to solve the problems of difficult disposal and high cost of the current waste mercury-containing reagent.
The technical scheme provided by the invention is as follows: adding waste mercuric acetate reagent into a reaction kettle, adding NaOH for chemical decomposition reaction to obtain mercuric carbonate precipitate, stirring to fully dissolve the mercuric carbonate precipitate, controlling reaction temperature and time, carrying out chemical decomposition reaction in the reaction kettle, and naturally cooling to obtain mercuric carbonate precipitate HgCO3Precipitate and Na2CO3Separating crystal, dissolving in hot water, and hot filtering to obtain HgCO3Drying and heating the mercury-containing waste gas to obtain HgO, then carrying out pyrogenic distillation and condensation on the HgO to obtain crude mercury, purifying the crude mercury to obtain a simple substance mercury product, wherein the produced mercury-containing waste gas is subjected to condensation and adsorption treatment and then is discharged up to the standard, and the produced wastewater is subjected to precipitation treatment and then is discharged up to the standard.
The chemical reaction formula of the method is as follows:
in the invention, the addition amount of NaOH is 0.3-1.5 kg/kg C4H6O4Hg is preferably in the range of 1.2 to 1.5 kg/kgC4H6O4Hg。
The reaction temperature in the invention is 250-300 ℃, and the optimal range is 270-290 ℃.
The reaction time is 0.5-1.5 h, and the optimal range is more than 1 h.
Compared with the prior art, the expected effects of the invention are as follows: the method has the advantages of simple operation, low treatment cost, average mercury recovery rate of over 99 percent, simple process, low cost, good economy and the like compared with a solidification landfill method.
Drawings
FIG. 1 is a flow chart of a method for recovering a waste mercuric acetate reagent according to the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
5g of waste mercuric acetate reagent and 2.5g of NaOH are added into 1L of deionized water (the temperature is 80 ℃), stirred and dissolved, and then transferred into a 2L reaction kettle to react for 0.5h at the temperature of 250 ℃.
Cooling to room temperature to generate HgCO3Precipitate and Na2CO3Adding hot water (above 80 deg.C), and filtering to obtain HgCO3Drying and heating the mercury to obtain HgO, then carrying out pyrogenic distillation and condensation on the HgO to obtain crude mercury, and purifying to obtain a simple substance mercury product, wherein the purity of the mercury is 99.21% by testing.
Example 2
5g of waste mercuric acetate reagent and 5g of NaOH are added into 1L of deionized water (the temperature is 80 ℃), stirred and dissolved, and then transferred into a 2L reaction kettle to react for 1.0h at the temperature of 270 ℃.
Cooling to room temperature to generate HgCO3Precipitate and Na2CO3Adding hot water (above 80 deg.C), and filtering to obtain HgCO3Drying and heating the mercury to obtain HgO, then carrying out pyrogenic distillation and condensation on the HgO to obtain crude mercury, and purifying to obtain a simple substance mercury product, wherein the purity of the mercury is 99.35% by testing.
Example 3
5g of waste mercuric acetate reagent and 7.5g of NaOH are added into 1L of deionized water (the temperature is 80 ℃), stirred and dissolved, and then transferred into a 2L reaction kettle to react for 1.0h at the temperature of 290 ℃.
Cooling to room temperature to generate HgCO3Precipitate and Na2CO3Adding hot water (above 80 deg.C), and filtering to obtain HgCO3Drying and heating the mercury to obtain HgO, then carrying out pyrogenic distillation and condensation on the HgO to obtain crude mercury, and purifying to obtain a simple substance mercury product, wherein the purity of the mercury is 99.87% by testing.
The above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the scope of the present invention. Any modification and replacement within the principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for recovering a waste mercuric acetate reagent is characterized by comprising the following steps: adding waste mercuric acetate reagent into a reaction kettle, adding NaOH, carrying out chemical decomposition reaction to obtain mercuric carbonate precipitate, stirring to fully dissolve the mercuric carbonate precipitate, controlling reaction temperature and time, carrying out chemical decomposition reaction in the reaction kettle, and naturally cooling to obtain mercuric carbonate precipitate HgCO3Precipitate and Na2CO3Separating crystal, dissolving in hot water, and hot filtering to obtain HgCO3Drying and heating the mercury-containing waste gas to obtain HgO, then carrying out pyrogenic distillation and condensation on the HgO to obtain crude mercury, purifying the crude mercury to obtain a simple substance mercury product, wherein the produced mercury-containing waste gas is subjected to condensation and adsorption treatment and then is discharged up to the standard, and the produced wastewater is subjected to precipitation treatment and then is discharged up to the standard.
2. The method for recovering the waste mercury acetate reagent as claimed in claim 1, which is characterized in that: the addition amount of NaOH is 0.3-1.5 kg/kg C4H6O4Hg is preferably 1.2 to 1.5kg/kg C4H6O4Hg。
3. The method for recovering the waste mercury acetate reagent as claimed in claim 1, which is characterized in that: the reaction temperature is 250-300 ℃, and the optimal range is 270-290 ℃.
4. The method for recovering the waste mercury acetate reagent as claimed in claim 1, which is characterized in that: the reaction time is 0.5-1.5 h, and the optimal range is more than 1 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911248992.9A CN111020237A (en) | 2019-12-09 | 2019-12-09 | Method for recovering waste mercury acetate reagent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911248992.9A CN111020237A (en) | 2019-12-09 | 2019-12-09 | Method for recovering waste mercury acetate reagent |
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| Publication Number | Publication Date |
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| CN111020237A true CN111020237A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911248992.9A Withdrawn CN111020237A (en) | 2019-12-09 | 2019-12-09 | Method for recovering waste mercury acetate reagent |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575507A (en) * | 2020-06-02 | 2020-08-25 | 沈阳环境科学研究院 | Method for recovering waste mercury bromored reagent |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344212A (en) * | 2011-07-04 | 2012-02-08 | 北京中科百旺环保科技有限公司 | Technology for removing mercury from mercury-containing waste alkali |
| CN104532018A (en) * | 2014-12-12 | 2015-04-22 | 贵州重力科技环保有限公司 | Method for recovering mercury from multi-element mercury-containing hazardous solid wastes by high-temperature rotary roasting |
| CN107012329A (en) * | 2017-03-27 | 2017-08-04 | 昆明理工大学 | A kind of method of the synchronous mercury reclaimed in useless mercury catalyst and regenerated carbon |
-
2019
- 2019-12-09 CN CN201911248992.9A patent/CN111020237A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344212A (en) * | 2011-07-04 | 2012-02-08 | 北京中科百旺环保科技有限公司 | Technology for removing mercury from mercury-containing waste alkali |
| CN104532018A (en) * | 2014-12-12 | 2015-04-22 | 贵州重力科技环保有限公司 | Method for recovering mercury from multi-element mercury-containing hazardous solid wastes by high-temperature rotary roasting |
| CN107012329A (en) * | 2017-03-27 | 2017-08-04 | 昆明理工大学 | A kind of method of the synchronous mercury reclaimed in useless mercury catalyst and regenerated carbon |
Non-Patent Citations (1)
| Title |
|---|
| 姜晓明，陈扬，刘俐媛主编: "《含汞废物处置与环境风险管理》", 31 July 2018, 上海：上海科学技术出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575507A (en) * | 2020-06-02 | 2020-08-25 | 沈阳环境科学研究院 | Method for recovering waste mercury bromored reagent |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200417 |
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| WW01 | Invention patent application withdrawn after publication |