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A method for separating lead, antimony and arsenic from anode slime alkaline leaching solution

An anode slime and lead separation technology, applied in the field of separation of lead, antimony and arsenic, can solve the problems of high separation coefficient, invisible, incomplete separation of arsenic and antimony, etc., and achieve the effect of simple process

Active Publication Date: 2018-04-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the method of forming sodium pyroantimonate (or sodium antimonate), there will be a considerable part of colorless and transparent crystal Na 3 AsO 4 10H 2 Co-precipitation of O makes the separation of arsenic and antimony incomplete
Although there is a method of co-precipitating Sb, Pb, As from NaOH solution and separating it from NaOH solution, there is no literature on the separation of Sb, Pb and As from NaOH solution, especially the high separation coefficient of Sb, Pb and As Methods

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  • A method for separating lead, antimony and arsenic from anode slime alkaline leaching solution
  • A method for separating lead, antimony and arsenic from anode slime alkaline leaching solution

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Embodiment 1

[0032] Embodiment 1: A method for separating lead, antimony and arsenic from anode slime alkaline leaching solution, the specific steps include:

[0033] (1) Add 500g of antimony-lead alloy powder with a particle size of less than 300 mesh and 120g of sodium nitrate (the mass ratio of antimony-lead alloy powder to sodium nitrate is 25:6) into a 10L reactor, and add 6.2L of 120g / L NaOH solution (according to the liquid-solid ratio in the reactor: mL:g is 10:1), at a temperature of 200°C and a stirring speed of 350rpm, leaching for 1.5h, after the reaction is completed, cool to 100°C, and filter to obtain lead (II) sodium salt (Na 2 PbO 2 ) and antimony (Ⅲ) sodium salt (NaSbO 2 ) mixed solution; add sodium nitrite into the mixed solution according to the liquid-solid ratio mL:g of 100:1, and react at a temperature of 100°C for 30 minutes to oxidize antimony (Ⅲ) to antimony (Ⅴ); Cool to 30°C and crystallize for 18 hours to obtain lead pyroantimonate (Pb 2 Sb 2 o 7 ) seed; ...

Embodiment 2

[0038] Embodiment 2: A method for separating lead, antimony and arsenic from anode slime alkaline leaching solution, the specific steps include:

[0039] (1) Add 500g of antimony-lead alloy powder with a particle size of less than 300 mesh and 160g of sodium nitrite (the mass ratio of antimony-lead alloy powder to sodium nitrite is 25:8) into a 10L reaction kettle, and add 7.92 L at a concentration of 130g / L of NaOH solution (the ratio of liquid to solid in the reactor is 12:1 in mL:g), leached for 2.5h at a temperature of 230°C and a stirring speed of 250 rpm. After the reaction was completed, it was cooled to 110°C and filtered to obtain lead ( Ⅱ) acid sodium salt (Na 2 PbO 2 ) and antimony (Ⅲ) sodium salt (NaSbO 2 ) mixed solution; add sodium nitrite to the mixed solution according to the liquid-solid ratio mL:g of 70:1, and react at a temperature of 105°C for 40 minutes to oxidize antimony (Ⅲ) to antimony (Ⅴ); cool the reaction solution to 25 ℃, the crystallization tim...

Embodiment 3

[0041] Embodiment 3: A method for separating lead, antimony and arsenic from anode slime alkaline leaching solution, the specific steps include:

[0042] (1) Add 500g of antimony-lead alloy powder with a particle size of less than 300 mesh and 160g of sodium nitrate (the mass ratio of antimony-lead alloy powder to sodium nitrate is 25:8) into a 10L reactor, and add 7.26L of 150g / L NaOH solution (the ratio of liquid to solid in the reactor is 11:1 mL:g), leached for 1.8h at a temperature of 250°C and a stirring speed of 350rpm, after the reaction was completed, cooled to 105°C, filtered to obtain lead (II) acid Sodium salt (Na 2 PbO 2 ) and antimony (Ⅲ) sodium salt (NaSbO 2 ) mixed solution; add sodium nitrite to the mixed solution according to the liquid-solid ratio mL:g of 90:1, and react at a temperature of 108°C for 50 minutes to oxidize antimony (Ⅲ) to antimony (Ⅴ); cool the reaction solution to 35°C, the crystallization time was 17 h, and lead pyroantimonate (Pb 2 Sb ...

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Abstract

The invention relates to a method for separating lead-antimony and arsenic from an anode mud alkaline leaching solution, and belongs to the field of nonferrous metallurgy. According to the method, pyroantimonic acid seed crystals are prepared, the antimony (III) in the anode mud alkaline leaching solution is oxidized into antimony (V) with sodium nitrate or sodium nitrite, the pyroantimonic acid seed crystals are added to carry out cooling crystallization, the mass ratio of lead-antimony to arsenic in the obtained pyroantimonic acid crystallized product is 100 to 1, and separation between lead-antimony and arsenic is realized; and with the method, the property of the alkaline solution is not changed, and the alkaline solution can be recycled.

Description

technical field [0001] The invention relates to a method for separating lead, antimony and arsenic from an anode slime alkaline leaching solution, and belongs to the technical field of nonferrous metal metallurgy. Background technique [0002] Tin anode slime contains metals such as Sb, Bi, As, Cu, Au and Ag. Some people use oxygen pressure alkali leaching to treat tin anode slime, such as CN201610277602, a method for oxygen pressure treatment of tin anode slime to comprehensively recover valuable metals, and NaOH solution containing arsenic and tin is produced. Recover sodium stannate and sodium arsenate by evaporative crystallization. Due to the high energy consumption of the method of separating tin and arsenic by evaporation and crystallization, sodium stannate and sodium arsenate are entrained with each other, and the separation of tin and arsenic is not complete. This method fails to solve the problem of separation of Sb, Pb and As. [0003] Lead anode slime is a by-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/44C22B13/00C22B30/02C22B30/04
CPCC22B3/44C22B7/008C22B13/045C22B30/02C22B30/04Y02P10/20
Inventor 朱云徐瑞东何云龙李宁陈顺智
Owner KUNMING UNIV OF SCI & TECH
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