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Method for judging blowing end point of precious metal smelting of Kaldo furnace

A precious metal and end-point technology, applied in the field of metal smelting, can solve the problems of long analysis period of gold and silver alloys, inability to use on-site production guidance immediately, etc., and achieve the effect of improving the yield

Pending Publication Date: 2022-06-28
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the gold-silver alloy analysis cycle is long during the precious metal smelting process of the Kaldor furnace and cannot be immediately used for on-site production guidance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1. 50t of material is fed into the Kaldor furnace, and the impurity removal reaction is carried out after reaching the blowing period. When the refining slag period is reached, 80KG sodium carbonate and 100KG quartz are added, and blowing is continued for 1 hour;

[0013] 2. Punch the furnace door to carry out the slag removal operation, observe the slag liquid level from rising to falling, take the slag liquid level monitoring point temperature as 1112°C, and detect its viscosity as 0.2 Pa.s;

[0014] 3. Remove the viscous slag from the upper layer, and a silver mirror reaction will appear on the surface of the melt, and light blue smoke will be produced in the form of fine filaments;

[0015] 4. Pour out the gold and silver alloy and cast it into cathode and anode plates, take a sample to test the composition of the sample, and its ω (Au+Ag)=97.56%, which meets the requirements of the blowing end point.

Embodiment 2

[0017] 1. The Kaldor furnace enters 60t of materials, and after reaching the blowing period, the impurity removal reaction is carried out. When the refining slag period is reached, 90KG sodium carbonate and 100KG quartz are added, and the blowing is continued for 1 hour;

[0018] 2. Punch the furnace door to carry out the slag removal operation, observe the slag liquid level from rising to falling, take the slag liquid level monitoring point temperature as 1125°C, and detect its viscosity as 0.22Pa.s;

[0019] 3. Remove the viscous slag from the upper layer, and a silver mirror reaction will appear on the surface of the melt, and light blue smoke will be produced in the form of fine filaments;

[0020] 4. Pour out the gold-silver alloy and cast it into cathode and anode plates, take a sample to test the composition of the sample, and its ω (Au+Ag)=97.69%, which meets the requirements of the blowing end point.

Embodiment 3

[0022] 1. The Kaldor furnace enters 55t of materials, and after reaching the blowing stage, the impurity removal reaction is carried out. When the refining slag stage is reached, 90KG sodium carbonate and 100KG quartz are added, and blowing is continued for 1 hour;

[0023] 2. Punch the furnace door to carry out the slag removal operation, observe the slag liquid level from rising to falling, take the slag liquid level monitoring point temperature as 1140°C, and detect its viscosity as 0.23Pa.s;

[0024] 3. Remove the viscous slag from the upper layer, and a silver mirror reaction will appear on the surface of the melt, and light blue smoke will be produced in the form of fine filaments;

[0025] 4. Pour out the gold-silver alloy and cast it into cathode and anode plates, take a sample to detect the composition of the sample, and its ω (Au+Ag)=97.85%, which meets the requirements of the blowing end point.

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Abstract

The invention discloses a method for judging a converting end point of precious metal smelting of a Kaldo furnace, which comprises the following steps: 1) after converting slag of the Kaldo furnace rises and falls back, when the liquid level of the slag is stable, measuring that the temperature of the slag reaches 1100 + / -20 DEG C; (2) adding a quartz reagent and a sodium carbonate reagent into the Kaldo furnace, blowing for 1 hour to make the furnace slag sticky, and measuring the viscosity to be 0.1-0.3 Pa.s, and (3) pushing open the upper-layer furnace slag by 5-10 mm, and visually observing that the lower-layer melt liquid level is in a silver mirror shape, and the smelting flue gas is relatively small and is in a light cyan shape, so that the smelting end point is reached.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and relates to a Kaldor furnace noble metal smelting and blowing process, and more specifically, relates to a method for judging the end point of the Kaldor furnace noble metal smelting and blowing. Background technique [0002] In the precious metal smelting process, gold, silver, platinum, palladium, rhodium, iridium and other precious metals and platinum group metals are separated and extracted from copper anode slime, which is mainly smelted by Kaldor furnace fire method. The production operation process is to remove the copper anode slime by pressure leaching base metals such as Cu, Ni, etc., and then dried into the furnace to smelt slag, after blowing and refining, it is cast into a silver anode plate and then electrolyzed. The entire smelting and blowing process is carried out in the Caldo furnace, and the end point of blowing directly affects the quality of the silver anode plate, ...

Claims

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Application Information

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IPC IPC(8): C22B11/02C22B7/00
CPCC22B11/021
Inventor 程东杰刘兴焘杜彦君王立刘发存杜建云董春俊赵军亮
Owner JINCHUAN GROUP LIMITED
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