Method for increasing gold leaching rate through suspension roasting of carbon-containing gold ore

A suspension roasting and suspension roasting furnace technology, applied in the direction of improving process efficiency, can solve the problems of complex process, difficult product separation, poor roasting effect, etc., and achieve high heat and mass transfer efficiency, good continuity, and complete reaction. Effect

Active Publication Date: 2020-08-04
NORTHEASTERN UNIV
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Problems solved by technology

[0003] Patent CN201710369536.4 relates to a beneficiation method of high-carbon fine-grained microscopic gold ore, which proposes to grind and flotation the raw ore to obtain rough concentrate, then grind the coarse concentrate and then separate to obtain gold concentrate, and then roast the gold concentrate For decarburization and desulfurization, the tailings undergo secondary roasting and leaching to obtain a total gold recovery rate of more than 90%. However, the process is complicated, the roasting time is long (2 to 3 hours), and the leaching rate of the tailings after the second-stage roasting is low, the highest is only 38.64 %, there are problems such as low efficiency, weak production co

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  • Method for increasing gold leaching rate through suspension roasting of carbon-containing gold ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Process such as figure 1 shown;

[0029] The Au content of carbon-bearing gold ore is 5.74g / t, the mass percentage of C is 2.93%, the mass percentage of As is 0.15%, and the mass percentage of S is 5.82%;

[0030] Crush the carbon-containing gold ore to a particle size of 5-15 mm, and then grind the ore to a particle size of -0.074 mm, accounting for 90% of the total mass, to obtain fine ore;

[0031] The fine ore is transported to the pre-oxidation suspension roaster with a burner at the bottom, and the top of the pre-oxidation suspension roaster is connected to the induced draft fan through a pipeline; under the condition of the induced draft fan, the gas and air are ignited by the burner to generate High-temperature flue gas, high-temperature flue gas enters the pre-oxidation suspension roaster, and the fine ore is in a suspended state under the action of air flow and negative pressure, and is heated to 650°C for dearsenic roasting, and the As in the fine ore is con...

Embodiment 2

[0036] Method is with embodiment 1, and difference is:

[0037] (1) The Au content of carbon-bearing gold ore is 18.37g / t, the mass percentage of C is 15.37%, the mass percentage of As is 0.62%, and the mass percentage of S is 9.94%; %;

[0038] (2) The roasting temperature for dearsenicization is 680°C; the residence time of fine ore in the pre-oxidation roasting furnace is 18 minutes;

[0039] (3) The strong oxidation roasting temperature is 570°C; the amount of oxygen introduced is O 2 1.2 times the amount required for the complete reaction of C and S in the pre-oxidized roasted powder; the volume concentration of oxygen in the strong oxidation suspension roaster is 30%; the residence time of the pre-oxidized roasted powder in the strong oxidation suspension roaster 40min;

[0040] (4) Grinding to the part of particle size-0.074mm accounts for 93% of the total mass, and obtains the secondary powder ore; the secondary powder ore is added with water to make a slurry with a...

Embodiment 3

[0043] Method is with embodiment 1, and difference is:

[0044] (1) The Au content of carbon-bearing gold ore is 24.58g / t, the mass percentage of C is 8.66%, the mass percentage of As is 0.77%, and the mass percentage of S is 6.05%; %;

[0045] (2) Roasting temperature for arsenic removal is 700°C; the residence time of fine ore in the pre-oxidation roaster is 15 minutes;

[0046] (3) The strong oxidation roasting temperature is 600°C; the amount of oxygen introduced is O 2 1.3 times the amount required for the complete reaction of C and S in the pre-oxidized roasted powder; the volume concentration of oxygen in the strong oxidation suspension roaster is 20%; the residence time of the pre-oxidized roasted powder in the strong oxidation suspension roaster 30min;

[0047] (4) Grinding to a particle size of -0.074mm accounts for 90% of the total mass to obtain secondary powder ore; add water to the secondary powder ore to make a slurry with a mass concentration of 45%, and the...

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Abstract

A method for increasing the gold leaching rate through suspension roasting of a carbon-containing gold ore includes the following steps of firstly, breaking and grinding the carbon-containing gold oreto obtain a fine ore; secondly, conveying the fine ore to a pre-oxidizing and suspension roasting furnace, making the fine ore at a suspension state under the action of gas flow and negative pressure, and heating the fine ore to 650-700 DEG C for dearsenification roasting to obtain pre-oxidized and roasted powder; thirdly, introducing the pre-oxidized and roasted powder into a strong-oxidizing and suspension roasting furnace, making the pre-oxidized and roasted powder at a suspension state under the action of gas flow, and performing strong-oxidizing and roasting at 550-600 DEG C to obtain strong-oxidized slag powder; fourthly, grinding the ore after cooling to obtain a secondary fine ore; and fifthly, adding water to prepare ore slurry, then adding sodium cyanide to be evenly stirred forcyanide leaching, and filtering a material subjected to leaching to obtain a liquid-phase gold-containing cyanide leaching solution. The method is high in production continuity and high in adaptability to different ores and equipment can be easily upsized and industrialized.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for enhancing gold leaching rate by suspending and roasting carbon-containing gold ore. Background technique [0002] Carbon-bearing gold ore is one of the difficult gold ores to treat. When the carbon content in the primary gold ore exceeds 0.2%, it will seriously interfere with the cyanidation gold extraction, and the phenomenon of "gold robbery" will obviously affect the gold leaching rate. With the dwindling resources of easy-to-handle gold mines, the efficient utilization of carbon-containing gold mines has become increasingly urgent. The cyanide gold extraction method has the characteristics of less cyanide consumption, high leaching rate and strong adaptability to ore. The first choice for gold production. According to statistics, 75% of the world’s gold is produced by cyanide gold extraction; therefore, how to efficiently remove carbon from...

Claims

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Application Information

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IPC IPC(8): C22B1/04C22B3/04C22B11/08
CPCC22B1/04C22B3/04C22B11/08Y02P10/20
Inventor 李艳军韩跃新肖汉新袁帅高鹏孙永升
Owner NORTHEASTERN UNIV
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