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Method for leaching low-grade zinc oxide ore

A zinc oxide ore, low-grade technology, applied to the improvement of process efficiency, etc., can solve problems such as complex instability, limited solubility and coordination ability, unstable ammonium carbamate, etc., and achieve good leaching effect

Inactive Publication Date: 2015-07-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has the advantages of high metal selectivity and short process, due to the limited solubility of ammonium salt and the 3 with Zn 2+ The coordination ability of zinc is relatively limited, so the leaching rate of zinc is low
Chinese patent ZL200910094206.4 proposes an activation method for ammoniacal leaching of high-calcium and high-magnesium zinc oxide ores. This method uses HF as an activator for ammoniacal leaching, and improves the zinc leaching rate by changing the properties of insoluble zinc minerals. , but the invention introduces F during the leaching process - , will be detrimental to the extraction and electrowinning process of the subsequent leachate
The Chinese patent application number is 201410496481.X, and the title of the invention is "a method for leaching high-calcium and high-magnesium zinc oxide ore". It is proposed to use ammonium carbamate-ammonia water as a leaching agent for leaching zinc oxide ore. This method can effectively promote the leaching of zinc oxide ore containing The dissolution of zinc minerals, but ammonium carbamate is not stable in aqueous solution, it is easy to decompose into ammonium carbonate and ammonium bicarbonate, and ammonium carbamate and Zn 2+ The formation of complexes is not stable, and there are still disadvantages such as low zinc leaching rate for difficult-to-handle hemimorphite and willemite
Although the use of sodium glutamate and amino acid salts as leaching agents has the advantages of high zinc leaching rate and good selectivity, but due to the relatively large molecular weight of sodium glutamate and amino acid salts, the solubility is limited, so these methods are not effective for zinc oxide. Zinc in mines, especially refractory hemimorphite and willemite, has weak leaching ability

Method used

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  • Method for leaching low-grade zinc oxide ore
  • Method for leaching low-grade zinc oxide ore
  • Method for leaching low-grade zinc oxide ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Grind low-grade zinc oxide ore to a particle size of 100% and pass through a sieve with an aperture of 75 μm, and prepare NH with a concentration of ammonia water of 2 mol / L, an ammonium chloride concentration of 2 mol / L, and an NTA concentration of 0.2 mol / L 4 Cl-NH 3 -1000 mL of NTA solution was used as the leaching agent solution, and 100 g of the above-mentioned low-grade zinc oxide ore was placed in the prepared leaching agent solution for slurrying, and the temperature was 40 ° C and the stirring speed was 400 r / min. After reacting for 2 h After filtering, washing and drying, 72.9 g of leaching residue was obtained, in which the zinc content was 1.83%, and the zinc leaching rate was 79.91%.

Embodiment 2

[0031] Example 2: The low-grade zinc oxide ore is ground to a particle size of 100% and passed through a sieve with an aperture of 75 μm, and NH with an ammonia concentration of 2 mol / L, an ammonium chloride concentration of 4 mol / L, and an NTA concentration of 0.4 mol / L is prepared. 4 Cl-NH 3-1000 mL of NTA solution was used as the leaching agent solution, and 200 g of the above-mentioned low-grade zinc oxide ore was placed in the prepared leaching agent solution for slurrying, and reacted for 4 h at a temperature of 60 °C and a stirring speed of 200 r / min After filtration, washing and drying, 144.4 g of leaching residue was obtained, in which the zinc content was 1.37%. Zinc leaching rate was 85.10%.

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Abstract

A method for leaching low-grade zinc oxide ore includes the steps of preparing a leaching agent solution, wherein the sum of ammonium chloride molar concentration and ammonia water molar concentration ranges from 1 mol / L to 10 mol / L, the nitrilo triacetic acid molar concentration ranges from 0.1 mol / L to 1 mol / L, and the ratio of the ammonium chloride molar concentration to the ammonia water molar concentration is between 1 to 1 and 5 to 1; secondly, conducting agitation leaching in the leaching agent solution after refining the low-grade zinc oxide ore to a screen with the 100% aperture of 50 micrometers to 100 micrometers, and conducting solid-liquid separation to obtain a zinc-contained leaching agent after the reaction is conducted for 4 hours under the ratio (mL / g), ranging from 5 to 20, of the liquid volume to the solid weight. The method has good leaching effects on various oxidation-state zinc species in the low-grade zinc oxide ore, the ratio of the total ammonia concentration to the nitrilo triacetic acid concentration can be flexibly regulated through a leaching system which is used, and the dosage of organic ligands can be reduced on the basis of ensuring high leaching rate.

Description

technical field [0001] The invention relates to a method for leaching zinc oxide ore, in particular to a method for coordinating and leaching zinc oxide ore in an alkaline system. Background technique [0002] Zinc oxide ore is a secondary mineral, which is formed by the oxidation and decomposition of zinc sulfide ore and the reaction of carbonate or silicate in surrounding rocks. Among them, zinc oxide ore with mining and utilization value in industry is mainly divided into smithsonite (ZnCO 3 ), hydrozincite (Zn 5 (OH) 6 (CO 3 ) 2) , hemimorphite (Zn 4 Si 2 o 7 OH·H 2 O) and willemite (ZnSiO 4 ) four categories. Because the surface of zinc oxide minerals has strong hydrophilicity and its composition is relatively complex, it is difficult to enrich through ore dressing. At present, the processing methods of zinc oxide ore are mainly pyrometallurgy and wet leaching. [0003] The fire treatment process of zinc oxide ore is to use coke to reduce the zinc oxide in zi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/14C22B19/00
CPCY02P10/20
Inventor 杨天足饶帅张杜超郝占东肖庆凯张新望刘伟锋陈霖
Owner CENT SOUTH UNIV
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