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Method for leaching high-calcium-magnesium zinc oxide ore

A high-calcium-magnesium and zinc oxide technology, applied in the field of mineral processing and metallurgy, can solve problems such as being unfavorable for efficient leaching, difficult to purify the leaching solution, and easy to corrode equipment, so as to promote the production and diffusion of products, promote efficient leaching, and reduce the dosage of chemicals Effect

Inactive Publication Date: 2015-01-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alkali leaching process is a strong alkaline system, and the alkali consumption in the process is high. When leaching silicon-containing ores, sodium silicate is easily formed and enters the leach solution, which is not conducive to efficient leaching.
[0007] The patent with application number 201110083273.3 is a method for treating low-grade zinc oxide ore with a weakly basic amino acid salt system. The weakly basic amino acid salt system is glycine, glutamic acid, iminodiacetic acid and nitrilotri One or more in acetic acid, or add with its corresponding sodium salt form; The leaching system and technology of this invention can effectively handle various zinc oxide ores containing calcium, magnesium, iron and silicon; But with CaO or Ca(OH ) 2 Precipitation of zinc in the leaching solution requires strict control of the pH range, and the process is complicated, making it difficult to achieve effective production
[0008] To sum up, for the wet leaching process of high-calcium-magnesium-zinc oxide ore, the acid leaching method has disadvantages such as large acid consumption and easy corrosion of equipment, so it is not suitable to be used; and the existing alkaline leaching method also has a large amount of chemicals. The leaching rate is low under normal temperature and pressure, and the leachate is difficult to purify; therefore, finding a high-efficiency leaching agent is one of the ways to effectively utilize high-calcium-magnesium-zinc oxide ore

Method used

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  • Method for leaching high-calcium-magnesium zinc oxide ore
  • Method for leaching high-calcium-magnesium zinc oxide ore

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Embodiment 1

[0028] This embodiment takes high calcium magnesium zinc oxide ore as the processing object. The zinc oxide ore contains zinc grade of 7.32%. The zinc minerals are complex in distribution and have a particle size of less than 1mm. The main zinc ore and hemimorphite are mainly , The oxidation rate reaches 81.87%, often symbiosis with gangue minerals; the main components of gangue minerals are CaO and MgO, the content of which is 14.18% and 9.22%, and the silica content is 6.93%; the ore is severely muddy, below 20 microns The amount of primary ore mud accounts for about 25% of the ore, and the ore also contains sericite, chlorite, lead alum and lead-iron alum and other minerals that are easy to mud.

[0029] The method of leaching high calcium magnesium zinc oxide ore described in this embodiment (such as figure 1 Shown), including the following steps:

[0030] (1) The high calcium magnesium zinc oxide ore is crushed and ground, and the weight percentage of the ore with a particle ...

Embodiment 2

[0036] This embodiment takes high-calcium-magnesium zinc oxide ore as the processing object. The zinc oxide ore has a grade of 5.52% zinc. The zinc minerals are complex in distribution and have a particle size of less than 1mm. The zinc ore and hemimorphite are mainly used. The oxidation rate reaches 86.12%, which often coexists with gangue minerals; the main components of gangue minerals are CaO and MgO, the contents of which are 24.14% and 19.27% ​​respectively, and a small amount of silica, with a content of 8.33%; the ore is severely muddy. The amount of primary ore mud below 20 microns accounts for about 20% of the original ore, and the ore also contains sericite, chlorite and other easily muddy minerals.

[0037] The method for leaching high calcium magnesium zinc oxide ore in this embodiment specifically includes the following steps:

[0038] (1) The high calcium magnesium zinc oxide ore is crushed and ground. After grinding, the weight percentage of the ore with a particle ...

Embodiment 3

[0044] (3) This embodiment uses high-calcium-magnesium zinc oxide ore as the processing object. The zinc oxide ore contains 8.71% zinc. The zinc mineral is complex in distribution and has a particle size of less than 1mm. Mainly, the oxidation rate reaches 91.17%, which often coexists with gangue minerals; the main components of gangue minerals are CaO and MgO, the content of which is 21.42% and 13.12%, and the silica content is 4.56%; the ore is seriously muddy, 20 The amount of primary ore mud below micron accounts for about 15% of the original ore, and the ore also contains minerals that are easy to muddy such as sericite.

[0045] The method for leaching high calcium magnesium zinc oxide ore in this embodiment specifically includes the following steps:

[0046] (1) Crush and grind the high calcium magnesium zinc oxide ore, and the weight percentage of the ore with a particle size of less than 74 μm after grinding accounts for 95%;

[0047] (2) After mixing ammonium carbamate and...

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Abstract

The invention discloses a method for leaching a high-calcium-magnesium zinc oxide ore, and belongs to the technical field of beneficiation metallurgy. The method comprises the following steps: at normal pressure and temperature, adding broken zinc oxide ores and grinding ores which contain high-calcium-magnesium alkaline gangue to ammonium carbamate and ammonium hydroxide, wherein the ores of which the particle sizes are smaller than 74mu m account for 75-95%; the mass ratio of ammonium carbamate to ammonium hydroxide is (1:3) to (1:4); the ammonia concentration is 2.5mol / L to 6.5mol / L; and the liquid-to-solid ratio is (3:1) to (6:1); stirring and leaching for 0.5-3 hours, so as to obtain zinc leaching rate of 84%-89%. In a water solution, the ammonium carbamate is unstable in property; ammonium carbonate and ammonium bicarbonate can be generated; three mixed leaching systems of ammonium carbamate-ammonium hydroxide, ammonium carbonate-ammonium hydroxide and ammonium bicarbonate-ammonium hydroxide can be formed after ammonium hydroxide is added; the method plays a synergistic role in leaching of the zinc oxide ore; dissolution of the zinc-bearing mineral can be effectively promoted; and high-efficiency leaching of the zinc oxide ores is achieved.

Description

Technical field [0001] The invention relates to a method for leaching high calcium magnesium zinc oxide ore, and belongs to the technical field of mineral processing and metallurgy. Background technique [0002] Zinc is one of the important metals and is widely used in industrial fields. It ranks fourth in global metal consumption. It is mainly used in the manufacture of zinc alloys and galvanizing, as well as chemical additives in the production of rubber and coatings. Zinc production mainly comes from zinc sulfide ore. With the development and utilization of easily treatable zinc resources, zinc sulfide ore is continuously depleted. Facing the rapid economic development, efficient recovery of zinc from zinc oxide ore has become one of the important issues in the field of mineral processing and metallurgy. [0003] The main methods for recycling zinc oxide ore include flotation, fire smelting, and wet leaching. The flotation method is mainly sulfide-amine flotation and sulfide-x...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/16C22B3/14C22B19/00
CPCY02P10/20
Inventor 毛莹博文书明方建军刘殿文邓久帅
Owner KUNMING UNIV OF SCI & TECH