System for extracting gold and silver from electric precipitation ash of sintering machine head

Abstract

The utility model discloses a system for extracting gold and silver from electric precipitation ash of a sintering machine head, which comprises a first stirring tank connected with a first filter press through a pipeline; the second stirring tank is used for receiving tailings produced by the first filter press; the second stirring tank is connected with a liquid inlet pipeline and a liquid outlet pipeline; the other end of the liquid outlet pipeline is connected with the leaching tank, and the liquid outlet pipeline is also connected with a dosing device; the leaching tank is further connected with a pregnant solution pool, the pregnant solution pool is connected with a replacement device, and the replacement device is used for replacing gold and silver in the pregnant solution through added zinc powder; the tailings containing gold and silver are collected through the second stirring tank, gold and silver in the tailings form a gold and silver complex through the leaching tank, the gold and silver complex is dissolved in a solution, gold and silver can be conveniently extracted in the subsequent replacement procedure, gold and silver metal can be effectively extracted from sintering ash, and the utilization value of the sintering ash is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrostatic precipitator ash recycling and utilization, in particular to a system for extracting gold and silver from electrostatic precipitator ash of a sintering machine head. Background Art

[0002] Sintering machine head electrostatic precipitator ash, referred to as sintering ash, is the dust collected by the sintering machine head flue gas electrostatic precipitator during the iron ore sintering process. It has high content of iron, potassium, lead and carbon. Its main chemical components are Fe2O3, Fe3O4, Ca0, C, Si02, KC1, NaC1, PbCl2, etc., and it also contains a small amount of gold and silver elements.

[0003] At present, the main use of sinter ash is to add it to sintered ore as a raw material for sintering. In addition, some companies use sinter ash as a resource, extracting potassium and sodium salts from it through water washing + evaporation process, and then returning the iron-containing slag as a raw material for sintered ore. However, these methods do not extract gold and silver from sinter ash, resulting in a waste of resources. Utility Model Content

[0004] The utility model aims to provide a system for extracting gold and silver from electrostatic dust removal ash of a sintering machine head, so as to extract the gold and silver metals in the sintering ash.

[0005] The utility model adopts the following technical scheme: a system for extracting gold and silver from electrostatic dust removal ash of a sintering machine head, comprising a first stirring tank, the first stirring tank being connected to a first filter press through a pipeline;

[0006] It also includes a second stirring tank, which is used to receive tailings produced by the first filter press; the second stirring tank is connected to a liquid inlet pipeline and a liquid outlet pipeline;

[0007] The other end of the liquid outlet pipeline is connected to the leaching tank, and the liquid outlet pipeline is also connected to a dosing device;

[0008] The leaching tank is also connected to the precious liquid pool, and the precious liquid pool is connected to the replacement device, which is used to replace the gold and silver in the rich solution by adding zinc powder.

[0009] Furthermore, the liquid outlet of the first filter press is connected to a collecting tank, and the collecting tank is used to provide raw liquid for the evaporation system.

[0010] Furthermore, the liquid outlet of the replacement device is connected to the lean liquid tank through the fourth filter press, and the lean liquid tank is connected to the liquid inlet pipeline of the second stirring tank.

[0011] Furthermore, a deoxidation tower is provided between the noble liquid tank and the replacement device.

[0012] Furthermore, there are multiple leaching tanks, and the multiple leaching tanks are connected in parallel.

[0013] Furthermore, a third slag pump and a second filter press are sequentially arranged between the leaching tank and the precious liquid pool along the liquid flow direction.

[0014] Furthermore, a third filter press is arranged between the precious liquid tank and the deoxygenation tower.

[0015] The beneficial effects of the utility model are as follows: the utility model collects tailings containing gold and silver through the second stirring tank, and then uses the leaching tank to make the gold and silver in the tailings form a gold-silver complex and dissolve in the solution, so as to facilitate the subsequent replacement process to extract gold and silver, and can effectively extract gold and silver metals from the sintered ash, thereby improving the utilization value of the sintered ash. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a system for extracting gold and silver from electrostatic precipitator ash from a sintering machine head according to an embodiment of the utility model.

[0017] Wherein: 101. hopper; 102. ball mill; 103. first stirring tank; 104. first slurry pump; 105. first filter press; 106. collecting tank;

[0018] 201. second mixing tank; 202. second slurry pump; 203. dosing device; 204. leaching tank; 205. slag bin; 206. third slag pump; 207. second filter press; 208. precious liquid tank; 209. third filter press; 210. deoxidation tower; 211. replacement device; 212. fourth filter press; 213. lean liquid tank; 214. water supply pipe. DETAILED DESCRIPTION

[0019] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0020] The utility model discloses a system for extracting gold and silver from electrostatic dust removal ash of a sintering machine head. Figure 1 As shown, it includes a first stirring tank 103, which is connected to a first filter press 105 through a pipeline; it also includes a second stirring tank 201, which is used to receive tailings produced by the first filter press 105; the second stirring tank 201 is connected with a liquid inlet pipeline and a liquid outlet pipeline; the other end of the liquid outlet pipeline is connected to a leaching tank 204, and the liquid outlet pipeline is also connected to a dosing device 203; the leaching tank 204 is also connected to a precious liquid pool 208, and the precious liquid pool 208 is connected to a replacement device 211, and the replacement device 211 is used to replace gold and silver in the rich solution by adding zinc powder.

[0021] The utility model collects tailings containing gold and silver through the second stirring tank, and then dissolves the gold and silver in the tailings into a gold-silver complex through the leaching tank 204, so as to facilitate the subsequent replacement process to extract gold and silver, and can effectively extract gold and silver metals from the sintered ash, thereby improving the utilization value of the sintered ash.

[0022] In one embodiment, the liquid outlet of the first filter press 105 is connected to the collection tank 106, and the collection tank 106 is used to provide the stock solution for the evaporation system. The stock solution contains high content of potassium and sodium, which can be extracted by the evaporation system. Specifically, the sintered ash is stored in the hopper 101. When the system is started, the sintered ash in the hopper 101 is sent to the ball mill 102 through the disc feeder and the belt conveyor mechanism, and the sintered ash is ground and mixed with water into slurry. It is usually required that the fineness of the sintered ash after grinding is 200 mesh>90%. Then, the obtained slurry enters the first stirring tank 103, and the slag is sent to the first filter press 105 through the first slurry pump 104. The first filter press 105 collects the liquid in the slurry and sends it to the collection tank 106 as the stock solution of the evaporation system. The tailings contain gold and silver, which are sent to the second stirring tank 201.

[0023] In one embodiment, the liquid outlet of the replacement device 211 is connected to the barren liquid pool 213 through the fourth filter press 212, and the barren liquid pool 213 is connected to the liquid inlet pipeline of the second stirring tank 201. The precious liquid is filtered again by the fourth filter press 212, and the filtered liquid is sent to the barren liquid pool 213 as the barren liquid, and finally sent to the second stirring tank 201 through the liquid inlet pipeline to mix with the tailings, which can save water resources and recycle the liquid of the entire system. In addition, while using the barren liquid, gold and silver in the barren liquid can be extracted again, saving costs and improving benefits.

[0024] In the embodiment of the utility model, a deoxidation tower 210 is also provided between the noble liquid pool 208 and the displacement device 211. Since a displacement reaction will occur in the displacement device 211, if the liquid contains oxygen, it will hinder the displacement reaction, so the deoxidation tower 210 is added to remove oxygen in the liquid and improve the efficiency of the displacement reaction.

[0025] In one embodiment, there are multiple leaching tanks 204, and the multiple leaching tanks 204 are connected in parallel.

[0026] In order to ensure smooth operation of the system, a third slag pump 206 and a second filter press 207 are sequentially arranged along the liquid flow direction between the leaching tank 204 and the noble liquid tank 208. In addition, a third filter press 209 is arranged between the noble liquid tank 208 and the deoxidation tower 210.

[0027] The working process of the utility model is:

[0028] The sintered ash enters the ball mill 102 through the hopper 101 and the belt conveyor in turn. The ball mill 102 grinds the sintered ash to make the fineness of the ground sintered ash 200 mesh>90%. Then, the slurry is sent to the first filter press 105 through the first slurry pump 104 for solid-liquid separation. The solution rich in potassium and sodium is sent to the collection tank 106 for subsequent evaporation process.

[0029] The tailings are sent to the second stirring tank 201, and liquid (i.e., lean liquid) is added through the liquid inlet pipeline to stir into slurry again. After being stirred evenly, it is sent to the leaching tank 204 through the second slurry pump 202. At the same time, a dosing device 203 is set on the pipeline between the two to add reagents to the leaching tank 204 through the pipeline to convert the chlorides and oxides containing gold and silver in the slurry into a complex solution (precious liquid) containing gold and silver ions, and the precious liquid is sent to the precious liquid pool 208 through the third slurry pump 206. In order to further remove the impurity solids in the precious liquid, a second filter press 207 is added between the third slurry pump 206 and the precious liquid pool 208.

[0030] The precious liquid is stored in the precious liquid pool 208, and then undergoes subsequent deoxidation and replacement processes. In order to further increase the purity of the precious liquid, a third filter press 209 is added between the precious liquid pool 208 and the deoxidation tower 210. The precious liquid then enters the deoxidation tower for deoxidation (this is because air is blown into the solution during the reaction in the leaching tank 204, and the addition of the rich liquid pool 208 can also reduce the oxygen content in the precious liquid by standing still), and then proceeds to the replacement device 211, where zinc powder is used to replace the gold and silver in the precious liquid to obtain a gold and silver mud product. The gold and silver content of the replaced solution is very low, and it is then filtered by the fourth filter press 212 and sent to the lean liquid pool 213.

[0031] In addition, when there is insufficient liquid in the entire system (such as in special circumstances such as leakage), water can be replenished through the water replenishment pipe 214 connected to the liquid inlet pipe.

Claims

1. A system for extracting gold and silver from electrostatic dust removal ash from sintering machine heads, characterized in that: It comprises a first stirring tank (103), wherein the first stirring tank (103) is connected to a first filter press (105) via a pipeline; It also includes a second stirring tank (201), wherein the second stirring tank (201) is used to receive tailings produced by the first filter press (105); the second stirring tank (201) is connected to a liquid inlet pipeline and a liquid outlet pipeline; The other end of the liquid outlet pipeline is connected to the leaching tank (204), and the liquid outlet pipeline is also connected to a dosing device (203); The leaching tank (204) is also connected to a noble liquid pool (208), and the noble liquid pool (208) is connected to a replacement device (211), and the replacement device (211) is used to replace gold and silver in the noble liquid by adding zinc powder.

2. A system for extracting gold and silver from electrostatic dust removal ash from sintering machine head as claimed in claim 1, characterized in that: The liquid outlet of the first filter press (105) is connected to a collecting tank (106), and the collecting tank (106) is used to provide raw liquid for the evaporation system.

3. A system for extracting gold and silver from electrostatic dust removal ash from sintering machine head as claimed in claim 2, characterized in that: The liquid outlet of the replacement device (211) is connected to the lean liquid pool (213) via the fourth filter press (212), and the lean liquid pool (213) is connected to the liquid inlet pipeline of the second stirring tank (201).

4. A system for extracting gold and silver from electrostatic dust removal ash from sintering machine head as claimed in claim 3, characterized in that: A deoxidation tower (210) is also provided between the noble liquid tank (208) and the replacement device (211).

5. A system for extracting gold and silver from electrostatic dust removal ash from sintering machine head as claimed in claim 4, characterized in that: There are a plurality of leaching tanks (204), and the plurality of leaching tanks (204) are connected in parallel.

6. A system for extracting gold and silver from electrostatic dust removal ash from sintering machine head as claimed in claim 5, characterized in that: A third slag pump (206) and a second filter press (207) are sequentially arranged between the leaching tank (204) and the noble liquid pool (208) along the liquid flow direction.

7. A system for extracting gold and silver from electrostatic dust removal ash from a sintering machine head as described in any one of claims 4 to 6, characterized in that: A third filter press (209) is provided between the noble liquid tank (208) and the deoxidation tower (210).

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