A highly efficient and pollution-free silver ingot casting deoxidizer and its deoxidation method and application

Abstract

The invention discloses a high-efficiency and no-pollution silver ingot casting deoxidizing agent and a deoxidizing method thereof. The deoxidizing agent is wheat strong flour; and the deoxidizing method comprises the following steps: (1) melting: electric silver powder is put in a crucible; the crucible is put in a medium-frequency furnace of 100 KW for melting; the temperature is quickly increased to 1050 DEG C with high power; at this time, the silver powder is molten to silver liquid; and when the weight of the silver powder reaches the casting weight, the power of the medium-frequency furnace is adjusted to 80 KW; (2) deoxidation: after the silver powder is totally molten to the silver liquid, the wheat strong flour is added in the crucible; the adding quantity of the flour is 0.42-1.67% of the weight of the silver powder; the paving thickness is 15-20 mm; the deoxidizing time is 6-20 min; and deslagging is performed after deoxidation; and (3) casting: a port of the crucible is aligned to a casting mold port; and the silver liquid is cast in a casting mold with a temperature of 250-300 DEG C and coated with a layer of carbon black. The deoxidizing agent has such advantages as low cost, short deoxidizing time and deoxidizing efficiency of not lower than 98%.

Description

technical field

[0001] The invention relates to the technical field of precious metal casting process improvement, in particular to an efficient and pollution-free silver ingot casting deoxidizer and its deoxidation method and application. Background technique

[0002] At present, the current production process of major smelters at home and abroad to deal with copper anode slime mainly adopts pyromelting-electrolysis or wet extraction-electrolysis process. The electrolysis process is to recover gold and silver from copper electrolysis anode slime. The main process is as follows: the anode slime undergoes sulfate roasting, leaching and decopper, and then separates gold from chloride and silver from sodium sulfite to obtain coarse silver powder, and the coarse silver powder undergoes fire blowing Become a silver anode plate, and then produce silver ingots that meet the national standard through electrolytic refining. The silver ingot casting process consists of four processes...

Examples

Embodiment 1

[0021] An efficient and pollution-free deoxidizer for casting silver ingots in this embodiment, the deoxidizer is wheat high-gluten flour.

[0022] The grain size of the wheat high-gluten flour described in this example is 90 mesh.

[0023] In the wheat high-gluten flour described in the present embodiment, the gluten quality is 32% on a wet basis, the protein is 12.5% ​​on a dry basis, the ash content is 0.65% on a dry basis, the sand content is 0.01%, and the magnetic metal is 0.002g / kg. It meets the technical requirements of first-class high-gluten wheat flour in the national standard GB / T 8607-88.

[0024] An efficient and pollution-free silver ingot casting deoxidizer deoxidation method in this embodiment includes the following steps: (1) Melting: put 120kg of electric silver powder in a crucible, and then put the crucible in a 100KW intermediate frequency furnace to melt, high-power Rapidly raise the temperature to 1050°C, at this time, the silver powder starts to melt ...

Embodiment 2

[0029] An efficient and pollution-free deoxidizer for casting silver ingots in this embodiment, the deoxidizer is wheat high-gluten flour.

[0030] The grain size of wheat high-gluten flour described in this example is 80 mesh.

[0031] In the wheat high-gluten flour described in this embodiment, the gluten is 38% on a wet basis, the protein is 13.2% on a dry basis, the ash content is 0.50% on a dry basis, the sand content is 0.01%, and the magnetic metal is 0.001g / kg. It meets the technical requirements of first-class high-gluten wheat flour in the national standard GB / T 8607-88.

[0032] An efficient and pollution-free silver ingot casting deoxidizer deoxidation method in this embodiment includes the following steps: (1) Melting: put 120kg of electric silver powder in a crucible, and then put the crucible in a 100KW intermediate frequency furnace to melt, high-power Rapidly raise the temperature to 1050°C, at this time, the silver powder starts to melt into silver liquid. A...

Embodiment 3

[0034] An efficient and pollution-free deoxidizer for casting silver ingots in this embodiment, the deoxidizer is wheat high-gluten flour.

[0035] The grain size of wheat high-gluten flour described in this example is 100 mesh.

[0036] In the wheat high-gluten flour described in the present embodiment, the gluten quality is 37% on a wet basis, the protein is 14.1% on a dry basis, the ash content is 0.60% on a dry basis, the sand content is 0.01%, and the magnetic metal is 0.002g / kg. It meets the technical requirements of first-class high-gluten wheat flour in the national standard GB / T 8607-88.

[0037]An efficient and pollution-free silver ingot casting deoxidizer deoxidation method in this embodiment includes the following steps: (1) Melting: put 120kg of electric silver powder in a crucible, and then put the crucible in a 100KW intermediate frequency furnace to melt, high-power Rapidly raise the temperature to 1050°C, at this time, the silver powder starts to melt into s...

technical field

[0001] The invention relates to the technical field of precious metal casting process improvement, in particular to an efficient and pollution-free silver ingot casting deoxidizer and its deoxidation method and application. Background technique

[0002] At present, the current production process of major smelters at home and abroad to deal with copper anode slime mainly adopts pyromelting-electrolysis or wet extraction-electrolysis process. The electrolysis process is to recover gold and silver from copper electrolysis anode slime. The main process is as follows: the anode slime undergoes sulfate roasting, leaching and decopper, and then separates gold from chloride and silver from sodium sulfite to obtain coarse silver powder, and the coarse silver powder undergoes fire blowing Become a silver anode plate, and then produce silver ingots that meet the national standard through electrolytic refining. The silver ingot casting process consists of four processes...

Examples

Embodiment 1

[0021] An efficient and pollution-free deoxidizer for casting silver ingots in this embodiment, the deoxidizer is wheat high-gluten flour.

[0022] The grain size of the wheat high-gluten flour described in this example is 90 mesh.

[0023] In the wheat high-gluten flour described in the present embodiment, the gluten quality is 32% on a wet basis, the protein is 12.5% ​​on a dry basis, the ash content is 0.65% on a dry basis, the sand content is 0.01%, and the magnetic metal is 0.002g / kg. It meets the technical requirements of first-class high-gluten wheat flour in the national standard GB / T 8607-88.

[0024] An efficient and pollution-free silver ingot casting deoxidizer deoxidation method in this embodiment includes the following steps: (1) Melting: put 120kg of electric silver powder in a crucible, and then put the crucible in a 100KW intermediate frequency furnace to melt, high-power Rapidly raise the temperature to 1050°C, at this time, the silver powder starts to melt ...

Embodiment 2

[0029] An efficient and pollution-free deoxidizer for casting silver ingots in this embodiment, the deoxidizer is wheat high-gluten flour.

[0030] The grain size of wheat high-gluten flour described in this example is 80 mesh.

[0031] In the wheat high-gluten flour described in this embodiment, the gluten is 38% on a wet basis, the protein is 13.2% on a dry basis, the ash content is 0.50% on a dry basis, the sand content is 0.01%, and the magnetic metal is 0.001g / kg. It meets the technical requirements of first-class high-gluten wheat flour in the national standard GB / T 8607-88.

[0032] An efficient and pollution-free silver ingot casting deoxidizer deoxidation method in this embodiment includes the following steps: (1) Melting: put 120kg of electric silver powder in a crucible, and then put the crucible in a 100KW intermediate frequency furnace to melt, high-power Rapidly raise the temperature to 1050°C, at this time, the silver powder starts to melt into silver liquid. A...

Embodiment 3

[0034] An efficient and pollution-free deoxidizer for casting silver ingots in this embodiment, the deoxidizer is wheat high-gluten flour.

[0035] The grain size of wheat high-gluten flour described in this example is 100 mesh.

[0036] In the wheat high-gluten flour described in the present embodiment, the gluten quality is 37% on a wet basis, the protein is 14.1% on a dry basis, the ash content is 0.60% on a dry basis, the sand content is 0.01%, and the magnetic metal is 0.002g / kg. It meets the technical requirements of first-class high-gluten wheat flour in the national standard GB / T 8607-88.

[0037]An efficient and pollution-free silver ingot casting deoxidizer deoxidation method in this embodiment includes the following steps: (1) Melting: put 120kg of electric silver powder in a crucible, and then put the crucible in a 100KW intermediate frequency furnace to melt, high-power Rapidly raise the temperature to 1050°C, at this time, the silver powder starts to melt into s...