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Zinc sulfide concentrate calcines and zinc ide ore combined leaching process

A technology of zinc sulfide concentrate and zinc oxide ore, which is applied in the tandem leaching of zinc sulfide ore and zinc oxide ore in the same leaching operation of silicon, in the field containing high iron, can solve the problem of increasing the consumption of neutralizer and sulfuric acid, uneconomical, Problems such as poor sedimentation performance

Inactive Publication Date: 2007-03-07
YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "desiliconization slag" produced by this method is quite loose, has poor sedimentation performance, and the water content of the slag after filtration is very high, so the loss of zinc along with the slag is also very large; if the zinc in the slag is recovered by washing method, The water consumption is very large; although the zinc leaching rate of this method is high, the amount of iron and silicon entering the solution is also high. In the neutralization stage, acid will be produced with the hydrolysis of iron ions, which requires more neutralization. The acid is used to neutralize this part of the acid, and as a result, a large amount of gypsum is produced, which not only increases the amount of slag, but also increases the consumption of neutralizing agent and sulfuric acid. Therefore, this process is not economical for zinc ore containing silicon and high iron.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: The zinc sulfide raw material is a mixture of zinc sulfide concentrate calcine and dust from a certain factory, and its composition is Zn53.01%, Fe5.82%, Pb1.95%. The zinc oxide ore comes from another mine, containing Zn22.80%, and the zinc oxidation rate is 90%. Firstly, use zinc sulfate waste electrolyte to neutrally leach the above-mentioned zinc sulfide concentrate calcined sand, the pH value of the end point is 5.0, the pulp enters the thickener, and the qualified zinc sulfate supernatant is produced, which is sent to the clean liquid for electrolysis; Add waste electrolyte and sulfuric acid to the underflow for high-temperature and high-acid leaching, with an initial acid concentration of 150-180 g / L.H 2 SO 4 , the reaction temperature is 85℃~95℃, the final acid concentration is 60~65 g / L.H 2 SO 4 , the pickling solution contains zinc 110-115 g / l, iron 18-20 g / l, the measured slag rate is 20.02%, the zinc leaching rate is 97.48%, and the iron leachin...

Embodiment 2

[0019] Embodiment 2: choose zinc sulfide concentrate calcined sand, its chemical composition is:

[0020] Zn 58.8%, Fe 7.42%, SiO 2 5.88%,

[0021] The phase composition is:

[0022] Zn (total zinc) 58.8%

[0023] Zn(ZnSO 4 ) 0.53%

[0024] Zn(ZnS) 0.27%

[0025] Zn(ZnO) 47.94%

[0026] Zn(ZnO.SiO 2 ) 6.6%

[0027] Zn(ZnO.Fe 2 o 3 ) 3.47%

[0028] Leaching conditions: temperature 90°C, leaching time 4 hours, initial acid 150 g / L.H 2 SO 4 , final acid 60 g / L.H 2 SO 4 .

[0029] Zn, Fe, Si leaching rate:

[0030] Zn98.54%, Fe74.78%, SiO 2 36.70%, slag rate 20.06%.

[0031] Select zinc oxide ore, its chemical composition is, Zn26.55%, Fe18.20%, SiO 2 7.94%, of which the zinc phase composition is 24.23% zinc carbonate, 1.25% zinc silicate, 0.73% zinc sulfide, and 0.34% iron-zinc spinel. After the minerals are crushed and ground, they are neutrally leached with waste electrolyte. That is, the condition is that the initial value is pH3, the end point is pH5.2, ...

Embodiment 3

[0037] Embodiment 3: choose zinc sulfide concentrate calcined sand, its chemical composition is:

[0038] Zn 57.8%, Fe 8.4%, SiO 2 4.5%

[0039] Select zinc oxide concentrate, which is taken from a concentrator, and its chemical composition is:

[0040] Zn 32.40%, Pb 1.67%, Fe 5.79%, SiO 2 18.94%

[0041] Cd 0.38%, CaO 4.16%, MgO 0.16%

[0042]The soluble zinc rate is 93.2%.

[0043] Firstly, neutral leaching is carried out on the calcined sand with waste electrolyte, and the neutral leaching liquid is sent to clean liquid, and the leaching slag is supplemented with waste electrolysis to add H 2 SO 4 Carry out high-temperature high-acid leaching, leaching temperature 95 ℃, time 2 hours, final acid concentration 65 grams / liter sulfuric acid, measure zinc leaching rate 98.5%, iron leaching rate 83%, silicon leaching rate 35%. The above pulp is continuously flowed into the zinc oxide concentrate leaching tank, the pH of the first tank is controlled to be 3.0, and the pH o...

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PUM

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Abstract

The present invention belongs to the wet metallurgical technology, in particular, it relates to a combined leaching-out method of zinc sulfide ore and zinc oxide ore containing high iron and silicone content. It includes the following steps: (1). leaching-out of zinc sulfide concentrate calcines, the calcines and solution containing sulfuric acid are simultaneously added into leaching-out channel, stirred under the condition of high-temp. and high acid to make reaction; (2) neutral leaching out of zinc oxide ore, the zinc oxide ore powder and leached ore slurry are stirred, its pH value can be progressively raised from 3.0-3.5 to 5-5.2, the reacted neutral leach can be used for electrolysis, and the leached slag can be used for next releaching-out.

Description

technical field [0001] The invention belongs to the hydrometallurgical technology, in particular to a method for serially leaching zinc sulfide ore containing high iron and silicon and zinc oxide ore in the same leaching operation. technical background [0002] Zinc sulfide concentrate is usually roasted in a fluidized roaster to convert ZnS into zinc oxide soluble in dilute sulfuric acid, and the iron compound contained in it will turn into zinc ferrite at high temperature. When leaching zinc oxide, the leaching of zinc ferrite is accompanied by the leaching of iron. In the process of iron removal, acids will be produced simultaneously with the removal of iron ions. In order to increase the precipitation rate of iron, these acids must be neutralized with a neutralizer. As a result, the leaching process is quite complicated and the required equipment is relatively large. Larger investment leads to increased production cost. [0003] Zinc oxide ore usually has a low zinc co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B19/00
CPCY02P10/20
Inventor 舒毓璋宝国峰张琦杨龙
Owner YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD