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Method of utilizing zinc hydro-metallurgy oxygen pressure acid leaching slag to prepare demercuration adsorbent

A technology of oxygen pressure acid leaching and wet zinc smelting, which is applied in the field of adsorption materials, can solve the problems of difficult application, high difficulty, and high quotation cost, and achieve the effects of low cost, reduced environmental hazards, and simple operation

Active Publication Date: 2020-02-18
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of absorbing mercury in Polyton, it is necessary to introduce highly corrosive chlorine gas, and a separate mercury removal equipment needs to be established, and the quotation cost is high, which makes it difficult to apply in the mercury removal purification of non-ferrous smelting flue gas
The mercury-containing waste liquid of non-ferrous smelting is mainly acidic solution, and the removal of mercury is mainly based on sulfide precipitation + iron salt adsorption, forming a large amount of mercury-containing waste residue, and the subsequent treatment is extremely difficult

Method used

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  • Method of utilizing zinc hydro-metallurgy oxygen pressure acid leaching slag to prepare demercuration adsorbent
  • Method of utilizing zinc hydro-metallurgy oxygen pressure acid leaching slag to prepare demercuration adsorbent
  • Method of utilizing zinc hydro-metallurgy oxygen pressure acid leaching slag to prepare demercuration adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a mercury-removing sorbent by using zinc oxygen pressure acid leaching slag from wet smelting, comprising the following steps:

[0038] (1) Pass the finely ground zinc oxide ore (zinc oxide concentrate) through a 100-mesh sieve to obtain zinc oxide ore particles with a particle size less than 150 μm, and then take 40g, 60g, 80g, 100g, 120g, 140g, 160g and 180g are uniformly mixed with 20g pressurized oxidation acid leaching residue (ie high sulfur residue) to obtain different premixes;

[0039] (2) Prepare a mixed solution of ethanol and water at a ratio of 1:1, and add sodium sulfide to the mixed solution of ethanol and water so that S 2- The concentration of ions is 0.02mol / L to obtain a sulfide salt solution;

[0040](3) Mix the different premixes obtained in step (1) with the sulfide salt solution obtained in step (2) respectively, the mass solid-to-liquid ratio is controlled to be 0.3:1, and ultrasonically stirred for 10 minutes to make the ...

Embodiment 2

[0046] A method for preparing a mercury-removing sorbent by using zinc oxygen pressure acid leaching slag from wet smelting, comprising the following steps:

[0047] (1) Pass the finely ground zinc oxide ore (zinc oxide concentrate) through a 100-mesh sieve to obtain zinc oxide ore particles with a particle size less than 150 μm, and then take 40g, 60g, 80g, 100g, 120g, 140g, 160g and 180g and 20g of pressurized oxidation acid leaching slag are mixed evenly to obtain different premixes with the tailings obtained after hot filtration (i.e. the high-sulfur slag after hot filtration);

[0048] (2)-(4) are the same as steps (2)-(4) of Example 1.

[0049] In the high-sulfur slag after hot filtration, the mass fraction of zinc is 10.24%, and the mass fraction of elemental sulfur is 38.63%.

[0050] Take the prepared mercury removal adsorbent, place it in a fixed bed, and evaluate the flue gas mercury removal performance of the mercury removal adsorbent. The specific process is: fi...

Embodiment 3

[0053] A method for preparing a mercury-removing sorbent by using zinc oxygen pressure acid leaching slag from wet smelting, comprising the following steps:

[0054] (1) Pass the finely ground zinc oxide ore (zinc oxide concentrate) through a 100-mesh sieve to obtain zinc oxide ore particles with a particle size of less than 150 μm, and then take 100 g of zinc oxide ore and 20 g of pressurized oxidation acid leaching residue to mix evenly to obtain premix;

[0055] (2) Prepare a mixed solution of ethanol and water at a ratio of 1:1, and add sodium sulfide to the mixed solution of ethanol and water so that S 2- The concentration of ions is 0.02mol / L to obtain a sulfide salt solution;

[0056] (3) Mix the premix obtained in step (1) with the sulfide salt solution obtained in step (2), control the mass solid-to-liquid ratio to 0.3:1, stir ultrasonically for 10 minutes to make the solution into a suspension, and then Put the turbid liquid into a closed hydrothermal reaction kett...

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Abstract

The invention discloses a method of utilizing zinc hydro-metallurgy oxygen pressure acid leaching slag to prepare a demercuration adsorbent. The method comprises following steps: (1) evenly mixing oxidized zinc ores with oxygen pressure acid leaching slag to obtain a premixed material, and dissolving soluble sulfides into an organic solution to obtain a sulfide solution; (2) mixing the premixed material and the sulfide solution obtained in the step (1), stirring the mixture under the assistance of ultrasonic waves to obtain a turbid liquid, heating the turbid liquid to carry out hydrothermal reactions, and collecting the product namely a zinc polysulfide compound; and (3) mixing the zinc polysulfide compound obtained in the step (2) with iron salts, and evenly mixing to obtain the demercuration adsorbent. The zinc hydro-metallurgy oxygen pressure acid leaching slag is taken as the raw material to prepare the demercuration adsorbent; the damage to the environment is reduced; the oxygenpressure acid leaching slag is completely converted into valuable resources; moreover, the prepared adsorbent has a high mercury removal rate, and at least 90% of mercury in various forms in flue gasand waste liquid is removed.

Description

technical field [0001] The invention belongs to the field of adsorbent materials, in particular to a preparation method of a mercury-removing adsorbent. Background technique [0002] With the increasing depletion of high-grade zinc concentrates and increasingly stringent environmental protection requirements, pressurized or atmospheric pressure oxygen-enriched direct wet zinc smelting is suitable for processing refractory minerals such as high-iron sphalerite and lead-containing zinc concentrates, The advantages of no acid-making process and less environmental pollution have been paid more and more attention. So far, my country has established several sets of oxygen pressure leaching full-hydro zinc smelting systems. In oxygen pressure leaching, zinc sulfide in zinc concentrate is directly oxidized into soluble zinc sulfate, while sulfur, lead, iron and other elements in the raw material remain in the slag, forming acid leaching high-sulfur slag. At present, the method of ...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/30B01D53/04B01D15/00
CPCB01J20/0244B01D53/02B01D15/00B01J2220/4893B01D2258/025B01D2258/0283B01D2257/602
Inventor 刘志楼李子良徐志峰严康张溪昝苗苗
Owner JIANGXI UNIV OF SCI & TECH
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