A high-efficiency flotation process for high-arsenic and high-carbon refractory gold ores

Abstract

The invention discloses a high-efficiency flotation technology for high-arsenic high-carbon refractory gold ore. The high-efficiency flotation technology comprises the following steps that 1) a flashfloatation technology is performed; 2), a preferential flotation technology is performed; 3), a branch flotation technology is performed; and 4) a bulk concentrate re-floatation technology is performed. The high-efficiency flotation technology is suitable for the high-arsenic high-carbon refractory gold ore, in particular to the high-arsenic high-carbon micro-fine-grain altered rock type refractory gold ore with the gold grade of 2-3 g / t, the flotation index is stable, the problem that the floatation index of the high-arsenic high-carbon refractory gold ore is relatively low is effectively solved, the grade of the concentrate obtained through the flotation processes can reach 30 g / t or above, the flotation recovery rate can be improved to 85% or above, and the high-efficiency flotation technology has very good economic and social benefits.

Description

Technical field [0001] The invention relates to the technical field of gold ore beneficiation, in particular to an efficient flotation process for high-arsenic and high-carbon refractory gold ore. Background technique [0002] my country is rich in metallurgical resources that are difficult to select. Among the proven gold geological reserves, about 1,200 tons are all difficult to select gold resources, which account for about 1 / 3 of the total proven reserves. Such resources are widely distributed, such as Guizhou Lannigou Gold Mine (52t), Qinghai Dachaidan Gold Mine (50t), Qinghai Wulonggou Gold Mine (50t), Liaoning Fengcheng (38t), Gansu Minxian Luerba Mine ( 30t), Guangxi Jinya Gold Mine (30t), Guizhou Zimuhan Mine (26t), Guizhou Yata Gold Mine (16t), Guangdong Changkeng Gold Mine (25t), Anhui Mashan Gold Mine (14t), Gansu Zhouquping Dingjin Mine (10t), Yunnan Zhenyuan Dongguayao Gold Mine (10t), etc. There are many reasons why these ores are difficult to handle, but the occ...

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Problems solved by technology

[0003] The first type is gold ore with high arsenic, carbon and sulfur. In this type of ore, it contains more than 3% arsenic, 1-2% carbon, and 5-6% sulfur. , the gold leaching rate is generally 20-50%, and a large amount of NaCN is consumed. When the flotation process is used for enrichment, although a higher gold concentrate grade can be obtained, the arsenic, carbon, and antimony contained in the concentrate Such harmful elements are high, which will have a great impact on the next step of gold extraction process

[0004] The second type is gold-bearing ore in which gold is wrapped in gangue minerals and harmful impurities in fine particles and microscopic forms. In this type of ore, the content of metal sulfide is small, about 1-2%, embedded in gangue The fine particles of gold in mineral crystals account for 20-30%, and the recovery rate of gold is very low by conventional cyanidation or flotation.

For semi-oxidized ores, especially those containing harmful components such as arsenic, sulfur and organic carbon, there are many shortcomings in the extraction of gold by leaching. First, the recovery rate of gold is not high; Pretreatment of the ore, oxidation of harmful components and elements before leaching can increase the leaching rate of gold, but the process is complicated and the production cost is high; the third is that the ore contains organic carbon, and the phenomenon of "robbing gold" will occur during the leaching process , reduce the leaching rate of gold; Fourth, these oxidized ores contain a large amount of primary slime, and the oxidized ores have poor floatability, and the flotation recovery rate is not high

From the above analysis, it can be seen that the high-arsenic and high-carbon fine-grained semi-oxidized gold ore is a refractory gold ore, and the existing recovery process often has the problem of low recovery rate.

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