Method for treating low-grade zinc oxide ore by using weakly alkaline amino acid salt system

A technology of amino acid salt and zinc oxide ore, applied in the direction of improving process efficiency, etc., can solve problems such as difficult filtration, difficult return of zinc-containing leaching solution, and high side effects of ammonia gas

Inactive Publication Date: 2011-11-16
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (1) The capital investment of pyrotechnics is large, and the environmental pollution is heavy. When dealing with low-grade zinc oxide, the recovery rate of zinc is not high, and the economic benefit is low.
[0007] (2) When the acid leaching process is used to treat complex low-grade zinc oxide ore with high calcium, magnesium, iron and silicon content, the acid consumption is high, the purification is complicated, and the filtration is difficult
[0008] (3) The ammonia gas volatilized in the ammonia immersion process has high toxic and side effects, which is harmful to the human body and the environment, and ammonia water needs to be continuously added in the process to maintain the total ammonia concentration
[0009] (4) The NaOH leaching process has high requirements on equipment, and it is not suitable for processing high-silicon and low-grade zinc oxide ore, and it is difficult to return to use after recovering zinc from the zinc-containing leaching solution

Method used

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  • Method for treating low-grade zinc oxide ore by using weakly alkaline amino acid salt system
  • Method for treating low-grade zinc oxide ore by using weakly alkaline amino acid salt system
  • Method for treating low-grade zinc oxide ore by using weakly alkaline amino acid salt system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] see figure 1 , after the zinc oxide ore is ground, the obtained ore powder passes through a sieve with a pore size of 150um, and its main components (wt%): Zn 6.5, Fe 6.5, CaO 25.74, MgO 0.83, Al 2 o 3 2.20, SiO 2 17.53, Cu 0.0049, Pb 0.91 and S 4.60, of which the zinc content in sphalerite is 0.97%, and the rest is oxidized zinc; technical grade sodium glutamate, content ≥ 95%; industrial sodium hydroxide, content ≥ 96% %; industrial grade calcium oxide, content ≥ 88%, ground finely through a 106um sieve.

[0032] Mix 133.5 g of the above-mentioned sodium glutamate with 500 ml of water, adjust its pH value to 9 with NaOH at 80° C. to obtain a leaching solution with a total concentration of ligand glutamate of 1.5 mol / L, and adjust the stirring speed to 300 r / min. Add 100g of zinc oxide ore, stir and leaching for 5 hours, filter while hot, wash the leaching residue with water and store it, combine the washing water and leaching solution to obtain 550ml of leaching ...

Embodiment 2

[0036] see figure 1 , after the zinc oxide ore is ground, the aperture is 150um, and its main components (wt%): Zn 7.72, Fe 4.84, CaO 8.02, MgO 0.57, Cd 0.23, SiO 2 46.06, Cu 0.01, Ni 0.0019, Pb 1.86, among which the zinc content in sphalerite is 1.35%, and the rest is oxidized zinc. Industrial grade iminodiacetic acid, content ≥ 95%; industrial sodium hydroxide, content ≥ 96%; industrial grade calcium oxide, content ≥ 88%, finely ground through a 106um sieve.

[0037] Mix 140g of the above-mentioned iminodiacid with 1000ml of water, adjust its pH value to 8 with NaOH at 70°C to obtain a leaching solution with a total concentration of ligand iminodiacetate radicals of 1mol / L, and adjust the stirring speed to 300r / min , add 200g of zinc oxide ore, filter while hot after leaching for 4 hours, wash the leached slag with water and stockpile, combine the washing water and leaching solution to obtain 1000ml of leaching solution, leaching solution composition (mg / L): Zn 11844, Ca 5...

Embodiment 3

[0042] see figure 1 , after the zinc oxide ore is ground, the aperture is 150um, and its main components (wt%): Zn 7.72, Fe 4.84, CaO 8.02, MgO 0.57, Cd 0.23, SiO2 46.06, Cu 0.01, Ni 0.0019, Pb 1.86, of which The zinc content in sphalerite is 1.35%, and the rest is oxidized zinc. Industrial grade aminoacetic acid, content ≥ 98%; industrial sodium hydroxide, content ≥ 96%; industrial grade calcium oxide, content ≥ 88%, finely ground through a 150um sieve.

[0043] Mix 92g of the above-mentioned aminoacetic acid with 1000ml of water, and adjust its pH value to 8.5 with NaOH at 75°C to obtain a leaching solution with a total concentration of ligand aminoacetic acid radicals of 1.2mol / L, adjust the stirring speed to 300r / min, add oxidation Zinc ore 200g, leached for 6 hours and then filtered while hot, the leached slag was washed with water and then stockpiled, the washing water and the leaching solution were combined to obtain 1000ml of leaching solution, the composition of the ...

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Abstract

The invention discloses a method for treating a low-grade zinc oxide ore by using a weakly alkaline amino acid salt system, which comprises the following steps of: grinding the complex low-grade zinc oxide ore, and performing cooperated leaching in the weakly alkaline amino acid salt system under the certain condition to ensure that zinc, lead, cadmium, copper, nickel and the like are dissolved in leachate and calcium, magnesium, iron, silicon and the like are undissolved and stay in leaching residues; adding CaO or Ca(OH)2 into the leachate to ensure that the zinc is precipitated in the form of zinc oxide and recovered, and valuable metals such as the lead, the cadmium, the copper, the nickel and the like are co-precipitated with the zinc and enriched in crude zinc oxide; and regulating the pH of solution in which the zinc is precipitated to be a certain value by using CO2, regenerating a leaching agent, returning the regenerated leaching agent for recycling, and calcining CaCO3 generated in the process of regenerating the leaching agent for recycling. The method for treating the low-grade zinc oxide ore by using the weakly alkaline amino acid salt system can be used for effectively treating various complex low-grade zinc oxide ores with high calcium, magnesium, iron and silicon content, and the operation system is mild and has small toxic and side effects on human bodies and an environment.

Description

technical field [0001] The invention relates to a method for treating low-grade zinc oxide ore, in particular to a method for treating low-grade zinc oxide ore with a weakly basic amino acid salt system. Background technique [0002] With the continuous development and consumption of easily smelted zinc sulfide ore resources, zinc oxide ore has received more and more attention from the zinc metallurgical industry. 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, mainly including smithsonite (ZnCO 3 ), hydrozincite (2ZnCO 3 ·3Zn(OH) 2 ), Willemite (Zn 2 SiO 4 ), hemimorphite (Zn 4 (H 2 O) Si 2 o 7 (OH) 2 )Wait. The grade of zinc oxide ore is generally low, generally lower than 20%, and the content of impurities such as calcium, magnesium, iron and silicon is relatively high, and the composition is complex, so it is difficult to sort. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/14C22B3/46C22B19/00
CPCY02P10/20
Inventor 杨天足窦爱春杨际幸刘伟锋张杜超王安
Owner CENT SOUTH UNIV
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