Roasting treatment method for high-lead, high-copper and high-iron zinc concentrate

A processing method and technology of zinc concentrate, applied in the field of metallurgy, can solve the problems of low soluble zinc content, roasting and bonding, etc., and achieve the effects of improving bed capacity, reducing the amount of smoke and dust, and solving the problems of roasting and bonding

Pending Publication Date: 2021-12-03
CHINA ENFI ENGINEERING CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a method for roasting high-lead, high-copper, and high-iron zinc concentrates to solve the problem of roasting and bonding of high-lead, high-copper, and high-iron zinc concentrates in the prior art, and at the same time improve the soluble zinc content of the roasted products. The problem of low content in order to reduce the difficulty of the subsequent wet leaching process

Method used

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  • Roasting treatment method for high-lead, high-copper and high-iron zinc concentrate
  • Roasting treatment method for high-lead, high-copper and high-iron zinc concentrate
  • Roasting treatment method for high-lead, high-copper and high-iron zinc concentrate

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Experimental program
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Effect test

Embodiment 1

[0043] The content of main elements in a high-lead, high-copper, high-iron-zinc concentrate is shown in the table below, which contains 8.6% lead, 3.2% copper and 7.8% iron. The zinc concentrate is mixed with return dust (smoke dust returned in the oxidation roasting process) and dilute sulfuric acid (40wt%) according to a mass ratio of 90:8:2, and after mixing evenly, it is granulated by a disc granulator to ensure The prepared particles meet the requirements of 0.5-5mm, and the proportion of 1-2mm particles is more than 75%. Dry the granulated material to ensure that the water content in the material is less than 1%.

[0044] at 10m 2 Take the fluidized roasting furnace as an example, the capacity of the fluidized furnace bed can reach 24t / m 2 ·d, the feeding amount per hour is 10t, the roasting treatment is carried out at 960°C, the roasting time is 4h, the air injection linear velocity is 2.3m / s, and the smoke and dust output during the roasting process is 11.5%. The ca...

Embodiment 2

[0048] The content of main elements in a high-lead, high-copper, high-iron-zinc concentrate is shown in the table below, which contains 3.5% lead, 2.1% copper and 14.2% iron. Mix the zinc concentrate with zinc sulfate and water according to the mass ratio of 92:6:2, and use a cylinder granulator to granulate after mixing evenly to ensure that the obtained particles meet the requirements of 0.5-5mm, and the proportion of 2-3mm particles is Up to 75% or more. Dry the granulated material to ensure that the water content in the material is less than 1%.

[0049] at 10m 2 Take the fluidized roasting furnace as an example, the capacity of the fluidized furnace bed can reach 26t / m 2 ·d, the feeding amount per hour is 10.83t, the roasting treatment is carried out at 1050°C, the roasting time is 5h, the air injection linear velocity is 2.5m / s, and the smoke and dust output during the roasting process is 10.9%. The calcined sand produced by the fluidized fluidized furnace flows into ...

Embodiment 3

[0053] The content of main elements in a high-lead, high-copper, high-iron-zinc concentrate is shown in the table below, which contains 4.5% lead, 2.5% copper and 6.5% iron. The zinc concentrate is mixed with return dust (smoke dust returned in the oxidation roasting process) and dilute sulfuric acid (10wt%) according to a mass ratio of 90:8:2, and after mixing evenly, it is granulated by a disc granulator to ensure The prepared particles meet the requirements of 0.5-5mm, and the proportion of 3-4mm particles is more than 75%. Dry the granulated material to ensure that the water content in the material is less than 1%.

[0054] at 10m 2 Take the fluidized roasting furnace as an example, the capacity of the fluidized furnace bed can reach 30t / m 2 ·d, the feeding amount per hour is 12.5t, the roasting treatment is carried out at 1000°C, the roasting time is 3h, the air injection linear velocity is 2.6m / s, and the amount of smoke produced during the roasting process is 9.8%. T...

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Abstract

The invention provides a roasting treatment method for high-lead, high-copper and high-iron zinc concentrate. The roasting treatment method comprises the following steps that S1, the high-lead, high-copper and high-iron zinc concentrate is mixed with a binder and granulated, and then drying is carried out to obtain zinc concentrate granules; S2, the zinc concentrate granules are added into a fluidized bed roaster or a fluidized bed to be subjected to oxidizing roasting treatment, and a roasted product is obtained; and S3, the roasted product is fed into a hydrogen reduction furnace for selective reduction, zinc ferrite in the roasted product is reduced into ZnO and Fe3O4, and a reduction product is obtained. According to the roasting treatment method for the high-lead, high-copper and high-iron zinc concentrate, the problem of roasting bonding of the high-lead high-copper high-iron zinc concentrate is effectively solved, the amount of smoke generated in the roasting process is reduced, and the bed capacity of the oxidizing roasting procedure is improved; and meanwhile, zinc ferrite in the roasted product is effectively converted into soluble zinc, and the roasted product meets the requirements of the subsequent wet leaching process.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for roasting high-lead, high-copper and high-iron zinc concentrate. Background technique [0002] At present, zinc smelting uses zinc sulfide concentrate as raw material, mainly including boiling roasting-leaching-purification-electrowinning and other processes. With the gradual depletion of low-iron, low-lead, and low-copper zinc concentrate resources, high-lead, high-copper, and high-iron zinc concentrates have gradually become important raw materials for zinc smelting. [0003] Patent CN108866321A discloses a fluidized roasting furnace for processing high-copper, high-lead-zinc concentrates. Its technology can improve the capacity of the fluidized hearth, reduce the S content in the calcined sand, and avoid sintering of high-lead, high-copper-zinc concentrates, but it has not been Really put into industrial production, the current bed capacity of the fluidized flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/02C22B19/34C25C1/16
CPCC22B1/243C22B1/02C22B19/34C25C1/16Y02P10/20
Inventor 苟海鹏许良陈学刚周钢彭思尧裴忠冶吴卫国陈宋璇王建铭王忠实
Owner CHINA ENFI ENGINEERING CORPORATION
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