System for in-situ trapping and smelting of silver chloride precipitate from metal lead
The system of sedimentation of silver chloride sedimentation through metal lead was captured, and the existing silver chloride smelting and recycling process has low direct silver receipt and high smelting costs. The quality of the product has reached more than 98%.
Patent Information
- Application Number
- CN202420941027.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-05
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-05
AI Technical Summary
In the existing silver chloride smelting and recycling process, the direct yield of silver is low, and the silver content in the smelting slag is high, resulting in high smelting costs and poor operating environment, which poses safety hazards.
Metal lead can be used to capture the system of silver chloride precipitation, and the efficient smelting recycling of silver chloride is achieved by replacing the reactor and filtering mechanism. The system includes reactors, filtering mechanisms, silver mud smelting furnaces, slag smelting furnaces, and vacuum distillation furnaces to reduce the silver content in the smelting slag through multiple steps and increase the direct collection of silver.
The efficient smelting recycling of silver chloride has been achieved, and the smelting recovery rate of silver has reached more than 98%. The gold and silver content of the thick silver obtained by the smelting is more than 98%. It is suitable for the electrolytic refinement process, reducing the smelting costs and operating risks.
Smart Images
Figure CN222411753U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of precious metal smelting, and relates to a smelting and recovery system for silver chloride. Background Art
[0002] In the process of cyanide replacement gold mud or mixed gold refining and purification, the classification and recovery of gold and silver is the core step of the process. At present, the nitric acid method and the controlled potential chlorination method are the current common refining processes. During the purification process, silver is classified and enriched in the form of silver chloride, and used as the main raw material for subsequent silver smelting and recovery. Due to its high smelting recovery rate and good product quality, "ammonia leaching-hydrazine hydrate reduction" may be the most efficient and simple process system in the silver chloride recovery process, but the operating environment of the system is poor and hydrazine hydrate is an explosive chemical with extremely strict purchase and storage conditions. Therefore, the system is no longer suitable for the existing production environment.
[0003] Silver chloride is directly reduced using zinc powder or iron powder. The resulting replacement silver mud has a high impurity content and usually needs to be pyro-refined again. However, the silver content entrained in the pyro-refining slag is high, which can reach 20~40%. In addition, the process cost of recovering silver from the smelting slag is too high. Therefore, it can only be sold as a silver-containing material, which ultimately leads to a low direct recovery rate of silver metal. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a system for in-situ capture and smelting of silver chloride precipitation by metal lead, which is used for realizing high-efficiency smelting and recovery of silver chloride.
[0005] The technical solution of the utility model is as follows:
[0006] A system for in-situ capture and smelting of silver chloride precipitation of metallic lead comprises a displacement reactor and a filtering mechanism connected to each other, wherein the displacement reactor comprises a reactor body, an agitator is installed inside the reactor body, an end cover is installed at the upper end, and a heating mechanism is installed at the lower end, and the end cover is connected to a silver chloride feeding hopper and a zinc powder feeding hopper; the filtering mechanism comprises a filtering container, a filter element is detachably installed in the filtering container, and the filter element divides the interior of the filtering container into two spaces, an upper and a lower space; the filtering container is connected to a drain pipe, the inner end of which is communicated with the space below the filter element and the outer end is used to connect to a waste liquid container and is provided with a control valve; the filtering container is also connected to an exhaust pipe, the inner end of which is communicated with the space below the filter element and the outer end is used to connect to a fan and is provided with a control valve; the filtering container is also connected to a water supply pipe, the inner end of which is communicated with the space above the filter element and is provided with a control valve; the reactor body is connected to the space above the filter element through a pipeline with a control valve and a suction pump.
[0007] It also includes a silver mud smelting furnace which is arranged behind the filtering mechanism and used as a mechanism for replacing the filter cake silver mud produced by the filtering mechanism, a slag smelting furnace which is arranged behind the silver mud smelting furnace and used as a furnace for smelting the smelting slag produced by the silver mud smelting furnace, and a vacuum distillation furnace which is arranged behind the slag smelting furnace and used as a furnace for separating crude silver from lead-silver alloy produced by the slag smelting furnace.
[0008] Compared with the prior art, the utility model has the following characteristics:
[0009] The utility model provides a new silver chloride precipitate smelting and recovery system. The smelting slag obtained by the replacement silver mud fire smelting is subjected to secondary smelting, and the metallic lead produced by the reduction of lead oxide and coke powder is used to capture the silver in the slag in situ, thereby reducing the silver content in the final waste slag and improving the direct recovery rate of precious metal smelting. The silver-lead alloy obtained by smelting with the utility model system is classified by vacuum distillation process, and the crude silver obtained by distillation has a low impurity content and can be directly used in the electrolytic refining process. The crude silver obtained by smelting can meet the requirements of the anode plate for electrolytic refining, and its gold and silver content reaches more than 98% in total. Therefore, the utility model realizes the efficient smelting and recovery of silver chloride precipitate. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural schematic diagram of a displacement reactor and a filtering mechanism in an embodiment of the system of the utility model.
[0011] Figure 2 It is a process flow chart of an embodiment of the utility model system.
[0012] In the figure, 1. displacement reactor; 11. reactor body; 12. heating mechanism; 13. end cover; 14. silver chloride hopper; 15. agitator; 16. zinc powder hopper; 2. suction pump; 3. filtering mechanism; 31. filtering container; 32. upper cover; 33. water supply pipe; 34. filter element; 35. drain pipe; 36. exhaust pipe; 4. silver mud smelting furnace; 5. crucible; 6. slag smelting furnace; 7. vacuum distillation furnace. DETAILED DESCRIPTION
[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0014] like Figure 1 The present system embodiment includes a displacement reactor 1, which includes a reactor body 11, an agitator 15 is installed inside the reactor body 11, an end cover 13 is installed at the upper end, and a heating mechanism 12 is installed at the lower end. The end cover 13 is connected to a silver chloride feeding hopper 14 and a zinc powder feeding hopper 16.
[0015] The reactor body 11 is connected to a filter mechanism 3 through a pipeline with a control valve and a suction pump 2. The filter mechanism 3 includes a filter container 31 with an upper cover 32, in which a filter element 34 is detachably installed, and the filter element 34 divides the interior of the filter container 31 into two upper and lower spaces. The end of the pipeline with the control valve and the suction pump 2 is connected to the space above the filter element 34. The filter container 31 is also connected to a drain pipe 35, whose inner end is connected to the space below the filter element 34 and whose outer end is used to connect to a waste liquid container and has a control valve. The filter container 31 is also connected to an exhaust pipe 36, whose inner end is connected to the space below the filter element 34 and whose outer end is used to connect to a fan and has a control valve. The filter container 31 is also connected to a water supply pipe 33, whose inner end is connected to the space above the filter element 34 and has a control valve.
[0016] like Figure 2 The embodiment of the system further includes a silver mud smelting furnace 4 disposed behind the filtering mechanism 3 and used as a mechanism for replacing the filter cake silver mud produced by the filtering mechanism 3, a slag smelting furnace 6 disposed behind the silver mud smelting furnace 4 and used as a furnace for melting the smelting slag produced by the silver mud smelting furnace 4, and a vacuum distillation furnace 7 disposed behind the slag smelting furnace 6 and used as a furnace for separating the lead-silver alloy produced by the slag smelting furnace 6 from the crude silver. The filter cake produced by the filtering mechanism 3 enters the silver mud smelting furnace 4, the smelting slag produced by the silver mud smelting furnace 4 enters the slag smelting furnace 6, and the lead-silver alloy produced by the slag smelting furnace 6 enters the vacuum distillation furnace 7.
[0017] The displacement reactor 1 is preferably a titanium reactor. The slag smelting furnace 6 is an induction furnace.
[0018] The following examples illustrate how to use the system of the utility model.
[0019] Step 1, replacement reaction: AgCl precipitate is added into the reactor body 11 through the silver chloride feeder 14, and water is added through the silver chloride feeder 14 to adjust the liquid-solid ratio, and hydrochloric acid for adjusting the pH value of the reaction system is added through the silver chloride feeder 14, and finally zinc powder is added through the zinc powder feeder 16. The heating mechanism 12 is turned on for heating, and then the stirrer 15 is turned on for continuous stirring, and the replacement reaction is carried out for 1.5 hours.
[0020] Step 2, filtering and washing: First, open the fan and control valve connected to the air extraction pipe 36 to extract air, then open the suction pump 2 and the control valve on the pipeline where the suction pump 2 is located to implement suction filtration. After the suction filtration is completed, close the suction pump 2 and the control valve on the pipeline where the suction pump 2 is located, and open the control valve connected to the water supply pipe 33 to add clean water to the filter container 31 to implement washing. After washing is completed, close the control valve connected to the water supply pipe 33, open the control valve connected to the drain pipe 35, and discharge the waste liquid into the waste liquid container.
[0021] Step 3: silver mud replacement: open the upper cover 32, take out the filter element 34 from the filter container 31, and remove the filter cake from the filter element 34, dry the filter cake and place it in the silver mud smelting furnace 4, add slag-making agent, stir and smelt (silver mud replacement) for 30 minutes to obtain crude silver and smelting slag.
[0022] Step 4, smelting: the smelting slag obtained in the third step is transferred to the slag smelting furnace 6 through the crucible 5, and then lead oxide and coke powder are added to the slag smelting furnace 6, and the lead-silver alloy is obtained after stirring and smelting for 30 minutes, and the smelting slag is discarded.
[0023] Step 5, separation of crude silver: transfer the lead-silver alloy to a vacuum distillation furnace 7, and perform vacuum distillation smelting for 0.6 h at a vacuum degree of less than 10 MPa and a temperature of 970±10° C. to separate the crude silver.
[0024] The crude silver obtained in the third and fifth steps was combined for melting and sampling for testing, and the combined gold and silver content reached more than 98%, and the smelting recovery rate of silver reached more than 98%.
Claims
1. A system for in-situ capture of silver chloride precipitate from metallic lead smelting, comprising a displacement reactor (1) and a filtering mechanism (3) connected to each other, characterized in that: The displacement reactor (1) comprises a reactor body (11), an agitator (15) is installed inside the reactor body (11), an end cover (13) is installed at the upper end, and a heating mechanism (12) is installed at the lower end, the end cover (13) is connected to a silver chloride feed hopper (14) and a zinc powder feed hopper (16); the filtering mechanism (3) comprises a filtering container (31), a filter element (34) is detachably installed in the filtering container (31), and the filter element (34) divides the interior of the filtering container (31) into two upper and lower spaces; the filtering container (31) 1) is connected to a drain pipe (35) having an inner end communicating with the space below the filter element (34) and an outer end for connecting to a waste liquid container and having a control valve; the filter container (31) is also connected to an exhaust pipe (36) having an inner end communicating with the space below the filter element (34) and an outer end for connecting to a fan and having a control valve; the filter container (31) is also connected to a water supply pipe (33) having an inner end communicating with the space above the filter element (34) and having a control valve; the reactor body (11) is connected to the space above the filter element (34) via a pipeline having a control valve and a suction pump (2).
2. The system for in-situ capture and smelting of silver chloride precipitate by metallic lead as claimed in claim 1, characterized in that: It also includes a silver mud smelting furnace (4) arranged at the rear of the filtering mechanism (3) and used as a mechanism for replacing the filter cake silver mud produced by the filtering mechanism (3), a slag smelting furnace (6) arranged at the rear of the silver mud smelting furnace (4) and used as a furnace for smelting the smelting slag produced by the silver mud smelting furnace (4), and a vacuum distillation furnace (7) arranged at the rear of the slag smelting furnace (6) and used as a furnace for separating the crude silver from the lead-silver alloy produced by the slag smelting furnace (6).