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Enhanced acid dissolve of acidizing fired slags of concentrated gold ores containing sulfur
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A technology for sulfation roasting and gold concentrate, which is applied in the direction of improving process efficiency and can solve the problems of low gold concentrate extraction rate and the like
Inactive Publication Date: 2007-03-14
DONGHUA UNIV +1
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Problems solved by technology
Generally, the extraction rate of gold from roasting refractory gold concentrate is lower than 95%, and the higher the arsenic content, the lower the extraction rate of gold concentrate. Therefore, it is necessary to propose a compound film that breaks the iron oxide and arsenic that wraps gold, so that the gold Expose it to improve the extraction rate of gold and silver, and at the same time, it can make comprehensive use of other valuable metals
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Embodiment 1
[0019] Add 60% sulfuric acid into the reaction kettle with agitator, start the agitator to stir, and add roasted slag at one time, the weight percentage of sulfuric acid solution and roasted slag is 1: 2, and the weight percentage of cosolvent and roasted slag is 1: 1. Diethylaminetetraacetic acid (EDTA), CuO, Fe in the solvent 2 o 3 , SiO 2 、Al 2 o 3 The proportioning ratio is 1%, 85%, 5%, 4%, 5%, the reaction temperature is 80°C, and the reaction time is 6 hours. According to the national standard, the iron leaching rate is 100%, and the gold and silver extraction rate is 98%.
Embodiment 2
[0021] Add 30% sulfuric acid into the reaction kettle with agitator, start the agitator to stir, add roasted slag at one time, the weight percentage of sulfuric acid solution and roasted slag is 1: 10, and the weight percentage of cosolvent and roasted slag is 1: 50. Diethylaminetetraacetic acid (EDTA), CuO, Fe in the solvent 2 o 3 , SiO 2 、Al 2 o 3 The proportioning ratio is 1%, 80%, 10%, 4%, 5%, the reaction temperature is 100°C, and the reaction time is 4 hours. According to the national standard, the leaching rate of iron is 100%, and the gold extraction rate of gold and silver is 98%.
Embodiment 3
[0023] Add 45% sulfuric acid in the reaction kettle with agitator, start the agitator to stir, add roasted slag at one time, the weight percentage of sulfuric acid solution and roasted slag is 1: 5, and the weight percentage of cosolvent and roasted slag is 1: 5. Diethylaminetetraacetic acid (EDTA), CuO, Fe in the solvent 2 o 3 , SiO 2 、Al 2 o 3 The proportions are 0.5%, 85%, 10.5%, 4%, 5%, the reaction temperature is 90°C, and the reaction time is 5 hours. According to the national standard, the leaching rate of iron is 100%, and the gold extraction rate of gold and silver is 98%. .
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Abstract
The invention was involved in the method to dissolve sulphating roasting slag of sulfureous gold ore by acid . The steps consist of the following: a) 20%-80% acid, roasting slag and lacquer solvent were added into the reactor and was mixed. The mass percent of acid and roasting slag was 1 to 1-15 and the mass percent of lacquer solvent and roasting slag was 1 to 1-100. b) All the materials were reacted for 1-6h at 60-120deg.C. c) Gold and silver were extracted by traditional method from filter residue. Extracted rate of ferrum in roasting slag was 1 fold more than traditional method under same temperature, time and concentration of acid solution .The method promoted extract of gold in the cyaniding technology and the efficiency was improved by 3%-4%.
Description
technical field [0001] The invention relates to a method for smelting sulfur-containing gold concentrate, in particular to a method for strengthening acid dissolution of acidified roasting slag of sulfur-containing gold concentrate. Background technique [0002] For difficult-to-select sulfur-containing gold concentrates, the traditional cyanidation method is used to directly extract gold and silver, and the extraction rate is low. The acid roasting method can increase the extraction rate of gold and silver, but the disadvantage of this process is that it is easy to cause over-burning or under-burning, and the decomposition of sulfur-containing and arsenic-containing minerals in the ore is not sufficient during under-burning, and the purpose of exposing the wrapped gold cannot be achieved. , When the calcine is overfired, the calcine is partially burnt to death, the pores of the calcine are closed by iron oxides, and the fine gold particles are wrapped twice, resulting in a ...
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