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Method for performing flash reducing and roasting on zinc calcine

A flash roasting and zinc calcination technology, which is applied in the field of zinc smelting, can solve the problems of low efficiency and long roasting time of rotary kilns and box-type resistance furnaces, and achieve the effects of short roasting time, rapid response and cost reduction

Active Publication Date: 2013-09-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the rotary kiln and box-type resistance furnace in the prior art to reduce and roast the zinc calcine to decompose the zinc ferrite in it so as to improve the metal recovery rate, but the efficiency of the rotary kiln and the box-type resistance furnace is low and the roasting time is long Defect, the purpose is to provide a low energy consumption, can realize the rapid and complete decomposition and reduction method of zinc ferrite in zinc calcine, this method has high economic value, can realize industrial production

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  • Method for performing flash reducing and roasting on zinc calcine
  • Method for performing flash reducing and roasting on zinc calcine

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Experimental program
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Effect test

Embodiment 1

[0029] Dry the zinc calcine with a particle size of -74μm to a moisture content of ≤1wt%, and then spray it into the flash roaster through the feeding system, and inject CO+N with a CO concentration of 0%vol at the top 2 The mixed gas is used as the material conveying gas, and the material falls in a suspended state in the furnace, and at the same time undergoes a reduction reaction with the CO gas introduced into the furnace; the furnace temperature is controlled at 1050°C, the furnace CO concentration is 200ppm, and the furnace CO 2 Concentration 35%vol, O in the furnace 2 The concentration is 0; the soluble zinc rate of the roasted product is 99.06% after analysis, the soluble zinc rate of the material after roasting increases by 12%, and the Fe content of the roasted product 2+ / T Fe The value of is 0.316, and the decomposition rate of zinc ferrite reaches 83.5%.

Embodiment 2

[0031] Grind and sieve the zinc calcine until the particle size is -125μm, dry it until the moisture content is ≤1wt%, and then put it into the flash roaster through the feeding system, and feed CO+N with a CO concentration of 18%vol at the top 2 The mixed gas is used as the material conveying gas, and the material falls in a suspended state in the furnace. At the same time, it undergoes a reduction reaction with the CO gas introduced into the furnace. The furnace temperature is controlled at 950°C, the CO concentration in the furnace is 2%vol, CO 2 The concentration is 50% vol, the decomposition rate of zinc ferrite in zinc calcined sand reaches 81.3%, and the soluble zinc rate of roasted products is 98.2%, of which Fe 2+ / T Fe The value of is 0.323; figure 1 In order to compare the XRD patterns before and after roasting, there is no characteristic peak of zinc ferrite, indicating that the decomposition of zinc ferrite in zinc calcine is relatively complete.

Embodiment 3

[0033] Grind and sieve the zinc calcine until the particle size is -74μm, dry it until the moisture content is ≤1wt%, then add it into the flash roaster through the feeding system, and feed CO+N with a CO concentration of 13%vol at the top 2 The mixed gas is used as the material conveying gas, and the material falls in a suspended state in the furnace, and at the same time undergoes a reduction reaction with the CO gas introduced into the furnace. The furnace temperature is controlled at 800°C, the furnace CO concentration is 1000ppm, and the furnace CO 2 With a concentration of 10%vol, the decomposition rate of zinc ferrite in zinc calcine reaches 76.5%, and the soluble zinc rate of roasted products is 97.1%, of which Fe 2+ / T Fe The value of is 0.319.

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Abstract

The invention discloses a method for performing flash reducing and roasting on zinc calcine. The method comprises the following steps: adding the zinc calcine and material conveying gas into a flash roasting furnace in a jet mode; and dropping the zinc calcine in the flash roasting furnace in a suspended state, and roasting. According to the method, the energy consumption is low, zinc ferrite in the zinc calcine can be rapidly and completely decomposed and reduced, and according to the method, economic value is high, and industrialized production can be realized.

Description

technical field [0001] The invention relates to a flash reduction roasting method of zinc calcine, which belongs to the field of zinc smelting. Background technique [0002] The main raw material of zinc hydrometallurgy is zinc calcined sand obtained by roasting zinc sulfide concentrate. During the desulfurization process of zinc concentrate by boiling roasting, most iron in zinc sulfide concentrate will inevitably produce zinc ferrite which is insoluble in dilute sulfuric acid solution. The formation of zinc ferrite not only leads to a low leaching rate of zinc (80% to 85%), but also many valuable metals enter the lattice of zinc ferrite, seriously affecting the recovery rate of indium, germanium, zinc and other metals and iron resources. utilization rate. At present, the wet zinc smelting process mainly adopts high temperature (close to the boiling point) high acid (>200g / L H 2 SO 4 ) intensified leaching, so that the zinc leaching rate increased from 80% to 85% to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B19/02
Inventor 戴曦柴立元吴永谦陈田庄周康洁李良斌
Owner CENT SOUTH UNIV
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