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Method for recovering metal resource from zinc calcine through reduction roasting-leaching-zinc sinking

A roasting and leaching technology, which is applied in the direction of improving process efficiency, can solve problems such as difficult follow-up treatment, pollution, and high labor operation intensity, and achieve the effects of reducing iron leaching rate, shortening process flow, and improving leaching efficiency

Inactive Publication Date: 2015-09-30
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

The process has high energy consumption, high labor operation intensity, low recovery rate of zinc, and serious environmental pollution.
The generated rotary kiln slag is mainly a solid solution of carbon, iron, lead, silver and scattered metals, which is hard, difficult to grind, difficult to follow-up treatment, and a large amount of accumulation pollutes the environment
The wet treatment process is mainly high temperature and high acid leaching-iron precipitation process. Zinc ferrite is forcibly dissolved under high temperature and high acid conditions. The sinking iron process is complicated, the production cost is high, and the requirements for equipment are high. A large amount of sinking iron slag is also a waste of resources and pollutes the environment.

Method used

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  • Method for recovering metal resource from zinc calcine through reduction roasting-leaching-zinc sinking
  • Method for recovering metal resource from zinc calcine through reduction roasting-leaching-zinc sinking
  • Method for recovering metal resource from zinc calcine through reduction roasting-leaching-zinc sinking

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Embodiment

[0036] In the present embodiment, the method of zinc calcined reduction roasting-alkali leaching-precipitating zinc comprises the following steps:

[0037] (1) Dry the zinc-zinc calcined sand of a lead-zinc smelter and grind it until it passes through a 100-200-mesh sieve. The chemical phase analysis and XRD analysis of all elements and zinc of zinc calcine are shown in Table 1, 2 and figure 1 . It can be seen from the analysis that the zinc calcine mainly contains 53.5% Zn and 12.1% Fe, and the Fe mainly exists in the form of ferrite. The recovery of zinc in zinc ferrite is the key to improving the overall zinc recovery rate.

[0038] Table 1 Elemental analysis results of zinc calcine, wt%

[0039]

[0040] Table 2 zinc phase analysis results, wt%

[0041]

[0042] (2) Put the dry and fine zinc calcined sand into the reduction roasting furnace, use N 2 Purify the air in the furnace, raise the temperature of the reduction roasting furnace to 700-800°C, start to add C...

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Abstract

The invention discloses a method for recovering a metal resource from zinc calcine through reduction roasting-leaching-zinc sinking. High-iron zinc calcine containing zinc ferrite is reduced and roasted under the CO atmosphere, so that the zinc ferrite is decomposed to zinc oxide and iron oxide; the alkaline leaching is performed for the roasting product by sodium hydroxide solution to obtain sodium zincate solution containing few impurity ions; and iron, lead and silver enter the leaching slag for enriching and recovering to realize high-efficiency separation of zinc and iron. The neutralization, the adjustment and the zinc sinking are performed for the leaching liquid by waste electrolyte in conventional zinc wet smelting; the leaching liquid is calcined by a muffle after the precipitation; and the zinc resource is recovered in a form of active zinc oxide. The method prevents the complicated iron sinking flow in the conventional zinc wet smelting procedure, is excellent in zinc-iron separation effect, and achieves the purpose of comprehensively recovering the metal resource.

Description

technical field [0001] The invention belongs to the intersecting field of metallurgical engineering and environmental engineering, and mainly relates to a method for efficiently separating zinc and iron from a traditional zinc hydrosmelting process and recovering valuable metal resources. Background technique [0002] my country is a big country in zinc smelting, and its zinc output has always been among the top in the world. At present, more than 85% of zinc is produced by traditional roasting-leaching-purification-electrowinning wet process. Zinc ore is often associated with 8-15% Fe. During the oxidation roasting process of hydrometallurgy, this part of Fe inevitably reacts with zinc oxide in zinc calcine to form zinc ferrite with stable properties. Zinc ferrite is difficult to dissolve in conventional neutral leaching and acid leaching, resulting in a low recovery rate of zinc, and a large amount of leaching slag containing lead and silver is piled up, causing environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B19/30C22B1/02C22B3/12C22B3/14C22B3/44
CPCY02P10/20
Inventor 彭兵柴立元陈栋闵小波彭宁李燕春林冬红袁莹珍
Owner CENT SOUTH UNIV
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