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A method of mixing high-arsenic gold ore calcined sand into the side-blowing reduction furnace of the lead smelting system in hot state

A technology of lead smelting and reduction furnace, which is applied in the field of recovering precious metals in high-arsenic gold ore calcine by using lead smelting process, which can solve the problems of low processing capacity of gold-containing calcine, avoid low extraction efficiency, and avoid cyanide tailings and waste water, the effect of shortening the extraction time

Inactive Publication Date: 2020-08-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem of low processing capacity of gold-bearing calcine in the current lead smelting system, the present invention aims to provide a method for adding hot gold-containing calcine on a large scale in the side blowing reduction furnace of the lead smelting system

Method used

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  • A method of mixing high-arsenic gold ore calcined sand into the side-blowing reduction furnace of the lead smelting system in hot state

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Embodiment 1

[0023] For a gold-bearing calcine, the gold content is 30g / t, the mass percentage of silica is 35%, the mass percentage of sulfur is 1.0%, and the mass percentage of As is 0.1%. The content of iron in iron ore is 35%, the content of silicon dioxide is 5.1%, the content of calcium oxide in limestone is 60%, the content of silicon dioxide is 2%, the reducing agent is coke particles, and its fixed carbon mass percentage is 80% .

[0024] Use an electric arc furnace to melt the gold-containing calcine at 1300 ° C, and press the Fe / SiO in the slag 2 The mass ratio is 1.0 to add iron ore. Add molten gold-bearing calcine into the tuyere area with a cross-sectional area of ​​8.4m 2 In the oxygen-enriched side-blown reduction furnace, the amount of molten high-lead slag processed in a single operation cycle of the furnace is 42t. 5 minutes after the molten high-lead slag is fed, the molten gold-containing calcine is added through the chute at a feeding rate of 50.4t / h and the molten...

Embodiment 2

[0027] For a gold-bearing calcine, the gold content is 70g / t, the mass percentage of silica is 25%, the mass percentage of sulfur is 1.8%, and the mass percentage of As is 0.6%. The content of iron in iron ore is 30%, the content of silicon dioxide is 3.5%, the content of calcium oxide in limestone is 65%, the content of silicon dioxide is 3%, the reducing agent is coke particles, and its fixed carbon mass percentage is 80% .

[0028] Use an oxygen-enriched top-blown furnace to melt the gold-containing calcine at 1300 ° C, and press the Fe / SiO in the slag 2 Add iron ore at a mass ratio of 1.1. Add molten gold-bearing calcine into the tuyere area with a cross-sectional area of ​​8.4m 2 In the oxygen-enriched side-blown reduction furnace, the amount of molten high-lead slag processed in a single operation cycle of the furnace is 42t. 5 minutes after the molten high-lead slag is fed, the molten gold-containing calcine is added through the chute at a feeding rate of 31.5t / h and...

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Abstract

The invention discloses a method for mixing high-arsenic gold ore roasted sand into a lead smelting system side blowing reducing furnace in a heat state. The gold containing roasted sand is fused at the temperature ranging from 1,100 DEG C to 1,350 DEG C, and iron ore is mixed; after oxygen-rich side blowing reducing furnace fused high-lead slag feeding is conducted for 5 min and before 5-10 min of fused high-lead slag feeding completion, the fused gold containing roasted sand and fused high-lead slag are combined through a chute to be added into the furnace, the gold containing roasted sand charging speed is 0.1-6 tons / square meter oxygen-rich side blowing reducing furnace tuyere zone section area.hour, limestone and a reducing agent are added, oxygen-rich air is blown in, and the temperature of melt in the furnace is kept to range from 1,050 DEG C to 1,200 DEG C; after high-lead slag feeding is finished, the reducing agent is added, the temperature of the melt in the furnace is keptto range from 1,200 DEG C to 1,300 DEG C, and reducing smelting is conducted for 30-60 min. According to the method, the matching handling capacity of the gold containing roasted sand in the lead smelting system can be improved by 12 or more times; and the noble metal recycling rate reaches 99% or above, the method is suitable for large-scale processing of multiple noble metal containing materialshard to treat.

Description

technical field [0001] The invention belongs to the field of pyrometallurgy of nonferrous metals, and in particular relates to a method for recovering precious metals in high-arsenic gold ore calcine by using a lead smelting process. Background technique [0002] Refractory gold ores refer to ores that cannot effectively leach most of the gold by conventional cyanidation after fine grinding. Therefore, in order to effectively extract gold from these ores, such ores must be pretreated to eliminate factors that affect gold cyanide leaching. Industrial pretreatment methods for such minerals include two-stage roasting, pressurized oxidation, and bacterial oxidation [Yang Tianzu, Metallurgy of Precious Metals, Central South University Press]. However, the cyanide leaching rate of some refractory gold ores is still difficult to improve even after pretreatment. For example, the high-arsenic refractory gold ore treated by two-stage roasting process is prone to over-burning and loc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B13/02C22B11/02
CPCC22B11/02C22B13/02Y02P10/20
Inventor 陈霖王振虎黄晴宇刘伟锋张杜超杨天足
Owner CENT SOUTH UNIV