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Low-grade lead-zinc oxide ore smelting system and method

A technology of lead-zinc oxide and a smelting method, applied in the field of mineral metallurgy, can solve the problems of low recovery rate of lead elements, long process flow, unsuitable for low-grade lead-zinc oxide ore, etc., so as to improve the volatilization efficiency of vacuum reduction and improve the extraction efficiency. , the effect of saving energy

Pending Publication Date: 2020-06-12
CHINA ENFI ENGINEERING CORPORATION
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a smelting system and method for low-grade lead-zinc oxide ore, so as to solve the problem that the existing smelting method is not suitable for low-grade lead-zinc oxide ore, and there are long process flow and low recovery rate of lead element The problem

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  • Low-grade lead-zinc oxide ore smelting system and method
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Experimental program
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Effect test

Embodiment 1

[0064] Pre-oxidation reaction: mix the raw ore and quartz sand evenly according to the weight ratio of 100:5, and put them into the pre-oxidation reaction device 10 (rotary kiln). Pass into oxygen-enriched air (O 2 Concentration 35%) for pre-oxidation reaction, the pre-oxidation reaction device 10 (rotary kiln) was heated to 1200 ° C and kept for 2 hours, and naturally cooled to room temperature to obtain kiln slag (pre-oxidation product) and sulfur-containing flue gas. After pre-oxidation treatment, the sulfur content in the kiln slag was reduced from 7.6% to 1.23%. The sulfur-containing flue gas is sequentially processed by the second dust collecting device 50 and the tail gas desulfurization device 40, and the flue gas is discharged after reaching the standard.

[0065] Reduction and volatilization reaction: Mix the kiln slag and coal powder evenly according to the weight ratio of 100:20, and put them into the reduction and volatilization device 21 (vacuum furnace). The v...

Embodiment 2

[0067]Pre-oxidation reaction: mix the raw ore and quartz sand evenly according to the weight ratio of 100:7, and put them into the pre-oxidation reaction device 10 (rotary kiln). Pass into oxygen-enriched air (O 2 concentration of 45%), the pre-oxidation reaction device 10 (rotary kiln) was heated to 1200 ° C and kept for 4 hours, and naturally cooled to room temperature to obtain kiln slag (pre-oxidation product) and sulfur-containing flue gas. After pre-oxidation treatment, the sulfur content in the kiln slag was reduced from 7.6% to 0.98%. The sulfur-containing flue gas is sequentially processed by the second dust collecting device 50 and the tail gas desulfurization device 40, and the flue gas is discharged after reaching the standard.

[0068] Reduction and volatilization reaction: mix the kiln slag and coal powder evenly according to the weight ratio of 100:25, and put them into the reduction and volatilization device 21 (vacuum furnace). The vacuum device 22 (vacuum p...

Embodiment 3

[0070] Pre-oxidation reaction: mix the raw ore and quartz sand evenly according to the weight ratio of 100:7, and put them into the pre-oxidation reaction device 10 (rotary kiln). Air is introduced into the pre-oxidation reaction device 10 (rotary kiln), the temperature of the pre-oxidation reaction device 10 (rotary kiln) is raised to 1100 ° C and kept for 4 hours, and naturally cooled to room temperature to obtain kiln slag (pre-oxidation product) and sulfur-containing fumes gas. After pre-oxidation treatment, the sulfur content in the kiln slag was reduced from 7.6% to 1.98%. The sulfur-containing flue gas is sequentially processed by the second dust collecting device 50 and the tail gas desulfurization device 40, and the flue gas is discharged after reaching the standard.

[0071] Reduction and volatilization reaction: mix the kiln slag and coal powder evenly according to the weight ratio of 100:10, and put them into the reduction and volatilization device 21 (vacuum furn...

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Abstract

The invention provides a low-grade lead-zinc oxide ore smelting system and method. The smelting system comprises a pre-oxidation reaction device and a vacuum reduction volatilization unit. The pre-oxidation reaction device is provided with a first charging opening and a slag discharging outlet. The first charging opening is used for adding low-grade lead-zinc oxide ore into the pre-oxidation reaction device, and meanwhile air or oxygen-enriched air is introduced. The vacuum reduction volatilization unit is provided with a second charging opening, a reducing agent inlet and a smoke outlet containing zinc oxide and lead oxide, wherein the second charging opening communicates with the slag discharging outlet through a slag discharging pipe. The smelting system is not only applicable to low-grade lead-zinc oxide ore, but also beneficial to improving the extracting efficiency of the element lead and the element zinc compared with a single smelting device.

Description

technical field [0001] The invention relates to the field of mineral metallurgy, in particular to a smelting system and method for low-grade lead-zinc oxide ore. Background technique [0002] The content of lead and zinc in low-grade lead-zinc oxide ore is generally less than 20%, and the content of calcium and iron is high. Zinc elements are mainly zinc silicate, zinc carbonate, zinc sulfide and other phases, lead elements are mainly lead carbonate and lead sulfide phases, and the gangue minerals are mainly calcite, dolomite, quartz and iron oxide, etc. , the use of low-cost lead-zinc oxide ore to extract metal zinc and metal lead has become a focus of attention of researchers from all over the world. [0003] At home and abroad, flotation or hydrometallurgy is often used to separate and enrich the lead and zinc elements in low-grade lead-zinc oxide ores, but there are few studies on pyrometallurgy. [0004] The existing literature (CN106766870A) provides a high-efficienc...

Claims

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Application Information

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IPC IPC(8): C22B19/38C22B13/02F27D17/00
CPCC22B19/38C22B13/02F27D17/008F27M2001/017F27M2001/01
Inventor 苟海鹏陈学刚裴忠冶余跃王书晓代文彬陈宋璇许良李明川
Owner CHINA ENFI ENGINEERING CORPORATION