Alkali leaching method of zinc oxide mine

A zinc oxide ore and alkali leaching technology, applied in the direction of improving process efficiency, can solve the problems of difficult to effectively separate leaching solution and leaching slag, many types of impurities, low zinc leaching rate, etc., achieving easy control of leaching conditions and reducing production costs , the effect of less types of impurities

Inactive Publication Date: 2013-03-13
UNIV OF SCI & TECH BEIJING
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  • Description
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Problems solved by technology

The grade of zinc oxide ore is low, generally 10-25%, and the phase is complex, the content of ore slime is large, the surface modification is difficult, and it is difficult to select and enrich
[0003] For the processing method of low-grade zinc oxide ore, the process of extracting zinc metal by wet method after high-temperature pyro-enrichment is usually adopted, but this process has higher requirements on the grade of the raw ore, generally more than 20%. High efficiency, while the recovery rate of zinc is not high
[0004] Using sulfuric acid as a leaching agent to directly treat zinc oxide ore is a zinc smelting process studied in recent decades, but there are still many deficiencies, such as the problem of controlling the form of silicon in the leaching solution. When the acid dissolves, if the silicon in the ore forms a colloid Silicic acid will make it difficult to effectively separate the leaching solution from the leaching slag; zinc oxide ...

Method used

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  • Alkali leaching method of zinc oxide mine
  • Alkali leaching method of zinc oxide mine
  • Alkali leaching method of zinc oxide mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Finely grind the zinc oxide raw ore to -100 mesh, calcinate at 400 ° C for 2 hours, take 1 gram after cooling and immerse in 80 ml of NaOH solution with a mass fraction of 20% (concentration: 6.25 mol / L), and control the temperature at 100 ° C. Stir for 4 hours, and use high-speed centrifugation to separate solid and liquid after cooling to obtain a solution containing zinc.

[0031] The leaching solution was fixed to a volume of 250 milliliters, and the concentration of zinc in it was detected after acidification and dilution, and it was calculated that after the zinc oxide raw ore was calcined at 400°C, the zinc leaching rate of alkali leaching was 92.88%.

Embodiment 2

[0033] Finely grind the zinc oxide raw ore to -100 mesh, calcinate at 500 ° C for 2 hours, take 1 gram after cooling and immerse in 80 ml of NaOH solution with a mass fraction of 15% (concentration: 4.41 mol / L), and control the temperature at 100 ° C. Stir for 4 hours, and use high-speed centrifugation to separate solid and liquid after cooling to obtain a solution containing zinc.

[0034] The leaching solution was fixed to a volume of 250 milliliters, and the concentration of zinc in it was detected after acidification and dilution, and it was calculated that after the zinc oxide raw ore was calcined at 500°C, the zinc leaching rate of alkali leaching was 87.55%.

Embodiment 3

[0036] Finely grind the zinc oxide raw ore to -100 mesh, calcinate at 600 ° C for 2 hours, take 1 gram after cooling and immerse in 80 ml of NaOH solution with a mass fraction of 17% (concentration: 5.12 mol / L), and control the temperature at 80 ° C. Stir for 4 hours, and use high-speed centrifugation to separate solid and liquid after cooling to obtain a solution containing zinc.

[0037] The leaching solution was fixed to a volume of 250 milliliters, and the concentration of zinc in it was detected after acidification and dilution, and it was calculated that after the zinc oxide raw ore was calcined at 600°C, the zinc leaching rate of alkali leaching was 87.33%.

[0038] Judging from the results of the examples and comparative tests, the effect after finely grinding and calcining the ore of zinc oxide is obviously better than that without calcining, and the leaching rate of zinc by alkali leaching is 7%-12% higher.

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Abstract

The invention relates to an alkali leaching method of a zinc oxide mine, belonging to the field of wet-process metallurgy of non-ferrous metal. The alkali leaching method comprises the following steps of: firstly carrying out calcining pretreatment on the zinc oxide mine as a raw material to decompose zinc oxide from smithsonite in the zinc oxide mine, controlling reaction temperature and reaction time by using an NaOH solution as a leaching agent, dissolving zinc in a leaching solution and then realizing solid-liquid separation through high-speed centrifugation to obtain a zinc-containing solution. The invention has the advantages of easy control of conditions, high leaching rate of zinc, good recovering effect, less varieties and low content of impurities in the leaching solution, convenient purification in the later stage, low production cost, no environmental pollution and can effectively utilize abundant low-quality zinc oxide mines in the southwest regions of China.

Description

technical field [0001] The invention belongs to the field of nonferrous metal hydrometallurgy, in particular to an alkali leaching method of zinc oxide ore mainly composed of smithsonite. Background technique [0002] With the decrease of zinc sulfide ore, zinc oxide ore is more and more concerned by the zinc metallurgical industry. Zinc oxide ore is a secondary mineral of zinc, which is formed by the oxidation and decomposition of zinc sulfide ore and replacement with carbonate or silicate in surrounding rocks, including smithsonite (ZnCO 3 ), Willemite (Zn 2 SiO 4 ), hydrozincite (2ZnCO 3 ·3Zn(OH) 2 ), hemimorphite (Zn 4 (H 2 O)[Si 2 o 7 ](OH) 2 )Wait. The grade of zinc oxide ore is low, generally 10-25%, and the phase is complex, the content of slime is large, the surface modification is difficult, and it is difficult to select and enrich. [0003] For the processing method of low-grade zinc oxide ore, the process of extracting zinc metal by wet method after hi...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B19/00
CPCY02P10/20
Inventor 邢献然张玉成邓金侠于然波陈骏
Owner UNIV OF SCI & TECH BEIJING
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