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Pretreatment process before silver flotation of highly leached residues

A high leaching slag and pretreatment technology, applied in the direction of improving process efficiency, etc., can solve the problems of high volatile content of crystal water and high loss on ignition

Inactive Publication Date: 2014-01-29
CHIFENG ZHONGSE ZINC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (4) The loss on ignition is as high as 33.41%, indicating that the volatile content such as crystal water in the slag is high

Method used

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  • Pretreatment process before silver flotation of highly leached residues

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: A pretreatment process before high-leaching slag silver flotation, which is carried out in sequence according to the following steps:

[0032] (1) Sizing treatment: High leaching slag and water are mixed and stirred at a slurry concentration of 40% to form a high leaching slag slurry, and lime milk is added to the high leaching slag slurry to adjust the pH to 4.3, creating conditions for optimization of flotation indexes ;

[0033] (2) Dispersion treatment: add sodium hexametasulfate dispersant into the high leaching residue slurry, add 120 grams of sodium hexametaphosphate per ton of high leaching slag, stir for 8 min, eliminate the effect of flocculant in the high leaching residue, and disperse the particles , No cohesion;

[0034] (3) Adsorption treatment: Add activated carbon powder to the high leaching residue slurry, add 3000 grams of activated carbon per ton of high leaching residue, stir for 5 minutes, and absorb the silver sulfate in the high leaching resi...

Embodiment 2

[0036] Example 2: A pretreatment process before high-leaching slag silver flotation, which is carried out in sequence according to the following steps:

[0037] (1) Sizing treatment: the high leaching residue and water are mixed and stirred at a slurry concentration of 35% to form a high leaching slag slurry, and lime milk is added to the high leaching slag slurry to adjust the pH to 4.2, creating conditions for optimization of flotation indexes ;

[0038] (2) Dispersion treatment: add sodium hexametasulfate dispersant to the high leaching residue slurry, add 130 grams of sodium hexametaphosphate per ton of high leaching slag, stir for 10 minutes to eliminate the effect of the flocculant in the high leaching slag, and disperse the particles , No cohesion;

[0039] (3) Adsorption treatment: Add activated carbon powder to the high-leaching residue slurry, add 2500 grams of activated carbon per ton of high-leaching residue, stir for 6min, and absorb the silver sulfate in the high-leach...

Embodiment 3

[0041] Embodiment 3: A pretreatment process before high-leaching slag silver flotation, which is carried out in sequence according to the following steps:

[0042] (1) Sizing treatment: the high leaching residue and water are mixed and stirred at a slurry concentration of 45% to form a high leaching slag slurry, and lime milk is added to the high leaching slag slurry to adjust the pH to 4.5 to create conditions for optimization of flotation indexes ;

[0043] (2) Dispersion treatment: Add sodium hexametasulfate dispersant to the high-leaching residue slurry, add 110 grams of sodium hexametaphosphate per ton of high-leaching residue, stir for 6min, eliminate the effect of flocculant in the high-leaching residue, and disperse the particles , No cohesion;

[0044] (3) Adsorption treatment: Add activated carbon powder to the high leaching residue slurry, add 3,500 grams of activated carbon per ton of high leaching residue, stirring for 4 minutes, adsorb the silver sulfate in the high le...

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Abstract

The invention discloses a pretreatment process before silver flotation of highly leached residues. Aiming at the physicochemical property of highly leached residues, the pretreatment process is provided for pretreatment before silver flotation. the pretreatment process comprises four process steps, including pulp mixing treatment, dispersion treatment, adsorption treatment and activation treatment, wherein pulp mixing is to adjust the pH of the acidic highly leached residue pulp to the range from 4 to 4.5 and adjust the concentration of the ore pulp to the range from 35% to 45% so as to reach appropriate flotation pH condition; the dispersion treatment is to eliminate the influence of flocculant in the highly leached residues by using sodium hexametaphosphate; the adsorption treatment is to adsorb silver sulfate and micro-particle silver in the highly leached residues by using an adsorption carrier activated carbon powder; and the activation treatment is to improve the floatability of non-selectable minerals by using sodium sulfate as an activator. The pretreated highly leached residues is advantageous for further flotation of silver; the use of chemical agents is low; the cost is low; and the silver recovery rate is high.

Description

Technical field [0001] The invention belongs to the technical field of non-ferrous metal smelting, and specifically relates to a pretreatment process before high-leaching slag silver flotation. Background technique [0002] At present, the high-leaching slag produced by the domestic high-acid leaching process has reached more than 1.5 million tons per year. Due to the low content of valuable metals, many enterprises just store them in the slag yard. In order to recover valuable metals such as silver, zinc, copper, etc. in the high-acid leaching slag, improve the economic efficiency of the enterprise, and reduce the environmental pollution caused by waste slag discharge, a domestic company conducts research on the recovery of silver in the leaching slag and generally adopts the flotation process Recovery of silver in high leaching residue. [0003] Take Chifeng Hongye Zinc Smelting Co., Ltd.'s low-pollution alumite-removing iron hydrometallurgical zinc smelting method for high-leac...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 马永涛王风朝葛英勇李龙张春明刘玉琴李连中朱建伟
Owner CHIFENG ZHONGSE ZINC IND CO LTD
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