CN116083733A - Method for removing cadmium element in crude lead - Google Patents
Method for removing cadmium element in crude lead Download PDFInfo
- Publication number
- CN116083733A CN116083733A CN202211510428.1A CN202211510428A CN116083733A CN 116083733 A CN116083733 A CN 116083733A CN 202211510428 A CN202211510428 A CN 202211510428A CN 116083733 A CN116083733 A CN 116083733A
- Authority
- CN
- China
- Prior art keywords
- lead
- cadmium
- boiler
- liquid
- content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052793 cadmium Inorganic materials 0.000 title claims abstract description 74
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 66
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 239000002893 slag Substances 0.000 claims abstract description 25
- 238000007670 refining Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000001179 sorption measurement Methods 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- C22B13/00—Obtaining lead
- C22B13/06—Refining
-
- 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
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
- C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of fire refining, in particular to a method for removing cadmium element in crude lead, which comprises the following steps: step 1: liquefying crude lead, namely filling 120 parts of crude lead into a boiler, arranging a boiler cover above the boiler, and heating the boiler to melt the crude lead into liquid; step 2: and (3) carrying out oxidation refining to remove cadmium, keeping the temperature of the boiler in a certain range, stirring the lead liquid for 20-40min, adding 0.2-0.3 part of industrial salt for adsorption slagging after stirring, and carrying out slag dragging operation after continuously stirring the lead liquid for 20-40 min. The invention provides a method for removing cadmium element in lead bullion, which can reduce the content of cadmium element in lead bullion to less than or equal to 0.0001 percent and meet the production requirement.
Description
Technical Field
The invention relates to the technical field of fire refining, in particular to a method for removing cadmium element in crude lead.
Background
The crude lead contains various noble metals and harmful impurities, cannot be directly used, and must be refined to remove the harmful impurities in the crude lead and recover the noble metals. CN1129811132a discloses an electrolytic refining method of lead bullion which is beneficial to cadmium removal, and can reduce the content of cadmium element in lead bullion to less than or equal to 0.0002%, but with the improvement of production standard, the adoption of the method can not meet the production requirement.
Disclosure of Invention
The purpose of the invention is that: the invention provides a method for removing cadmium element in lead bullion, which can reduce the content of cadmium element in lead bullion to less than or equal to 0.0001 percent and meet the production requirement.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method for removing cadmium element in crude lead, comprising the following steps: step 1: liquefying crude lead, namely filling 120 parts of crude lead into a boiler, arranging a boiler cover above the boiler, and heating the boiler to melt the crude lead into liquid;
step 2: refining by oxidation to remove cadmium, maintaining the temperature of the boiler in a certain range, stirring the lead liquid for 20-40min, adding 0.2-0.3 part of industrial salt to adsorb and slag after stirring, continuing stirring the lead liquid for 20-40min, and then carrying out slag dragging operation;
step 3: performing alkaline refining to remove cadmium, cooling the lead liquid obtained in the step 2, maintaining the temperature of the lead liquid between 450 and 550 ℃, adding 0.05 to 0.15 part of sodium hydroxide into the lead liquid, stirring the lead liquid for 1 to 2 hours, and then performing slag fishing operation;
step 4: detecting the content of cadmium element in the lead liquid obtained in the step 3;
step 5: removing cadmium from ferrous sulfide, cooling the lead solution obtained in the step 3, maintaining the temperature of the lead solution at 380-460 ℃, adding a certain amount of ferrous sulfide into the lead solution according to the content of cadmium element detected in the step 4, stirring the lead solution for 1-2h, and fishing out slag;
taking the lead liquid after slag dragging, detecting the content of cadmium element in the lead liquid, and if the content of cadmium element is less than or equal to 0.0001%, obtaining a qualified product;
if the content of cadmium element is more than 0.0001%, continuously adding a certain amount of ferrous sulfide, stirring the lead liquid again for 1-2h, and detecting the content of cadmium element in the lead liquid again after slag dragging until the content of cadmium element in the lead liquid is reached
≤0.0001％。
Preferably: in the step 1, the heating temperature of the boiler is 700-800 ℃.
Preferably: in the step 2, the temperature of the boiler is required to be kept between 700 ℃ and 800 ℃.
Preferably: in the step 5, the part range of the added ferrous sulfide is as follows: 0.05-0.15 parts.
In summary, the invention has the following beneficial effects:
the invention provides a method for removing cadmium element in lead bullion, which comprises liquefying lead bullion, removing cadmium by oxidation refining, removing cadmium by alkaline refining and removing cadmium by ferrous sulfide, wherein the cadmium removal steps can reduce the content of cadmium element in lead bullion to the extent that
Less than or equal to 0.0001 percent, and meets the production requirement.
Detailed Description
The present invention will be described in further detail below.
A method for removing cadmium element in crude lead, comprising the following steps: step 1: liquefying crude lead, namely filling 120 parts of crude lead into a boiler, arranging a boiler cover above the boiler, heating the boiler to melt the crude lead into liquid, and heating the boiler to 700-800 ℃;
step 2: refining by oxidation to remove cadmium, keeping the temperature of the boiler in a certain range, stirring the lead liquid for 20-40min at 700-800 ℃, adding 0.2-0.3 part of industrial salt to adsorb and slag after stirring, continuing stirring the lead liquid for 20-40min, and then carrying out slag dragging operation;
step 3: alkaline refining to remove cadmium, cooling the lead liquid obtained in the step 2, maintaining the temperature of the lead liquid between 450 and 550 ℃, adding 0.05 to 0.15 part of sodium hydroxide into the lead liquid, stirring the lead liquid for 1 to 2 hours, and then carrying out slag fishing operation;
step 4: detecting the content of cadmium element in the lead liquid obtained in the step 3;
step 5: removing cadmium from ferrous sulfide, cooling the lead solution obtained in the step 3, maintaining the temperature of the lead solution at 380-460 ℃, adding a certain amount of ferrous sulfide into the lead solution according to the content of cadmium element detected in the step 4, stirring the lead solution for 1-2h, and fishing out slag;
taking the lead liquid after slag dragging, detecting the content of cadmium element in the lead liquid, and if the content of cadmium element is less than or equal to 0.0001%, obtaining a qualified product;
if the content of cadmium element is more than 0.0001%, continuously adding a certain amount of ferrous sulfide, stirring the lead liquid again for 1-2h, and detecting the content of cadmium element in the lead liquid again after slag dragging until the content of cadmium element in the lead liquid is reached
≤0.0001％。
In the step 5, the range of parts of the added ferrous sulfide is as follows: 0.05-0.15 parts.
The specific embodiment is as follows: step 1: liquefying crude lead, loading 120 tons of crude lead into a boiler, arranging a boiler cover above the boiler, heating the boiler to 700-800 ℃ to melt the crude lead into liquid, and detecting the content of cadmium element in the lead liquid;
step 2: refining by oxidation to remove cadmium, maintaining the temperature of the boiler between 700 ℃ and 800 ℃, stirring the lead liquid for 20-40min, adding 200-300kg of industrial salt to adsorb and slag after stirring, continuing stirring the lead liquid for 20-40min, and then carrying out slag dragging operation and detecting the content of cadmium element in the lead liquid;
step 3: performing alkaline refining to remove cadmium, cooling the lead liquid obtained in the step 2, maintaining the temperature of the lead liquid between 450 and 550 ℃, adding 50 to 150kg of sodium hydroxide into the lead liquid, stirring the lead liquid for 1 to 2 hours, and then performing slag fishing operation;
step 4: detecting the content of cadmium element in the lead liquid obtained in the step 3;
step 5: removing cadmium from ferrous sulfide, cooling the lead solution obtained in the step 3, maintaining the temperature of the lead solution at 380-460 ℃, adding 50-150kg of ferrous sulfide into the lead solution according to the content of cadmium element detected in the step 4, stirring the lead solution for 1-2h, and fishing out slag;
taking the lead liquid after slag dragging, detecting the content of cadmium element in the lead liquid, and if the content of cadmium element is less than or equal to 0.0001%, obtaining a qualified product;
if the content of cadmium element is more than 0.0001%, continuously adding 50-150kg of ferrous sulfide, stirring the lead liquid again for 1-2h, removing slag, detecting the content of cadmium element in the lead liquid again, and repeating the operation until the content of cadmium element in the lead liquid is detected to be less than or equal to 0.0001%.
Experimental data illustrates: the cadmium content in the lead liquid can be greatly reduced by oxidation refining cadmium removal and alkaline refining cadmium removal, but after the steps are carried out, the cadmium content in the lead liquid cannot be continuously reduced, so that the cadmium content in the lead liquid needs to be further reduced through the step 5, the cadmium content in the lead liquid needs to be detected at the moment after the alkaline refining cadmium removal, so that the quality of ferrous sulfide is determined according to the current cadmium content in the lead liquid and the total mass of the lead liquid, namely, the higher the current cadmium content in the lead liquid is, the higher the total mass of the lead liquid is, the ferrous sulfide to be added each time is, otherwise, the specific experimental data are shown in the following table 1, and in the table, the total mass of the lead liquid after liquefaction of each sample is 120 tons:
TABLE 1
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that; modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to be covered by the scope of the claimed invention.
Claims (4)
1. A method for removing cadmium element from lead bullion, which is characterized by comprising the following steps: step 1: liquefying crude lead, namely filling 120 parts of crude lead into a boiler, arranging a boiler cover above the boiler, and heating the boiler to melt the crude lead into liquid;
step 2: refining by oxidation to remove cadmium, maintaining the temperature of the boiler in a certain range, stirring the lead liquid for 20-40min, adding 0.2-0.3 part of industrial salt to adsorb and slag after stirring, continuing stirring the lead liquid for 20-40min, and then carrying out slag dragging operation;
step 3: performing alkaline refining to remove cadmium, cooling the lead liquid obtained in the step 2, maintaining the temperature of the lead liquid between 450 and 550 ℃, adding 0.05 to 0.15 part of sodium hydroxide into the lead liquid, stirring the lead liquid for 1 to 2 hours, and then performing slag fishing operation;
step 4: detecting the content of cadmium element in the lead liquid obtained in the step 3;
step 5: removing cadmium from ferrous sulfide, cooling the lead solution obtained in the step 3, maintaining the temperature of the lead solution at 380-460 ℃, adding a certain amount of ferrous sulfide into the lead solution according to the content of cadmium element detected in the step 4, stirring the lead solution for 1-2h, and fishing out slag;
taking the lead liquid after slag dragging, detecting the content of cadmium element in the lead liquid, and if the content of cadmium element is less than or equal to 0.0001%, obtaining a qualified product;
if the content of cadmium element is more than 0.0001%, adding a certain amount of ferrous sulfide, stirring the lead liquid again for 1-2h, and detecting the content of cadmium element in the lead liquid again after slag dragging until the content of cadmium element in the lead liquid is less than or equal to 0.0001%.
2. The method for removing cadmium from lead bullion according to claim 1, wherein in step 1, the heating temperature of the boiler is 700-800 ℃.
3. A method for removing cadmium from lead bullion according to claim 1 wherein in step 2 the temperature of the boiler is maintained between 700 ℃ and 800 ℃.
4. The method for removing cadmium in lead bullion according to claim 1, wherein in the step 5, the added ferrous sulfide has the following parts: 0.05-0.15 parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211510428.1A CN116083733A (en) | 2022-11-29 | 2022-11-29 | Method for removing cadmium element in crude lead |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211510428.1A CN116083733A (en) | 2022-11-29 | 2022-11-29 | Method for removing cadmium element in crude lead |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116083733A true CN116083733A (en) | 2023-05-09 |
Family
ID=86211051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211510428.1A Pending CN116083733A (en) | 2022-11-29 | 2022-11-29 | Method for removing cadmium element in crude lead |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116083733A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112981132A (en) * | 2019-12-15 | 2021-06-18 | 湖南省桂阳银星有色冶炼有限公司 | Lead bullion electrolytic refining method beneficial to cadmium removal |
-
2022
- 2022-11-29 CN CN202211510428.1A patent/CN116083733A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112981132A (en) * | 2019-12-15 | 2021-06-18 | 湖南省桂阳银星有色冶炼有限公司 | Lead bullion electrolytic refining method beneficial to cadmium removal |
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