Selective zinc oxide leaching and weak acidic zinc sulfide flotation smelting and selection combining process

Abstract

The invention discloses a selective zinc oxide leaching and weak acidic zinc sulfide flotation smelting and selection combining process. For oxygen and sulfide mixed lead zinc ore, a zinc wet-method smelting process and a zinc flotation process are combined, zinc oxide in the ore is partially and selectively leached out by the first wet-method smelting process, and then zinc sulfide in the ore is floated out by the flotation process. In order to overcome the difficulty in treating the oxygen and sulfide mixed lead zinc ore, the invention provides the smelting and selection combining process which is short in process flow, reliable in technology, easy to operate and control, relatively low in material consumption and energy consumption for production, high in metal reclaiming efficiency, relatively good in economic benefit and high in practicability, the recovery of lead and zinc in the low-grade complex difficultly-selected oxygen and sulfide mixed lead zinc ore can be greatly improved, and the total recovery of lead and zinc can be up to over 90 percent.

Description

technical field [0001] The invention relates to the technical field of lead-zinc ore hydrometallurgy and flotation. Background technique [0002] my country is the largest producer and consumer of zinc metal. The shortage of zinc ore resources has become increasingly prominent. About one-third of zinc raw materials need to be imported every year. Insufficient supply of resources has become an important factor restricting the sustainable development of society. However, my country's zinc ore resources, especially low-grade and high-impurity zinc ore, have not been rationally utilized due to the lack of effective processing technology. [0003] At present, there are at least 50 million tons of low-grade refractory complex oxygen-sulfur mixed lead-zinc ores in my country. In particular, there are more than 40 million tons of such ores in the Lanping mining area in western Yunnan, with a potential economic value of more than 30 billion yuan. Due to The nature of its ore is extre...

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Problems solved by technology

In the prior art, there is also a combined process of zinc extraction with organic solvents and zinc hydrometallurgy, such as Chinese patent 200610010938.7, in which the stripping solution after zinc stripping is returned to the leaching process of the zinc hydrometallurgy process. In this process, the stripping agent contains H 2 SO 4 Usually as high as 150-200 grams per liter, not only the acid consumption is high, but also further purification treatment is required in actual production, increasing the purification process, prolonging the production process, increasing the production consumption of coal and purification agents, and pushing up the production cost

In addition, the flotation of the prior art usually carries out the flotation of lead-zinc sulfide ore under weakly alkaline conditions with a pulp pH value of 8 to 11, while the flotation under weakly alkaline conditions not only requires a large investment in equipment, but also can be used The type of flotation reagents is small, the amount is large, the water and electricity consumption is high, and the grade and recovery rate of the obtained zinc sulfide concentrate and lead sulfide concentrate are also low.

[0006] For a long time, both at home and abroad have not been able to develop a short process flow, reliable technology, easy operation and control, low production material consumption and energy consumption, high metal recovery rate, good economic benefits, and good industrialization prospects. Process technology for processing low-grade refractory complex oxygen-sulfur mixed lead-zinc ore

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