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Method for recovering sulfur from zinc oxygen pressure leached high-sulfur slag

A leaching and high-sulfur technology, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of low recovery rate of elemental sulfur, low grade of sulfur concentrate, and low recovery rate of sulfur, and achieve high recovery rate, The effect of reducing stockpiles and efficient recycling

Pending Publication Date: 2021-08-10
XUZHOU GUOMAO VALUABLE & RARE METAL COMPREHENSIVE UTILIZATION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sulfur recovery rate of the leaching slag is low in flotation without chemical addition, while the sulfide will float together with sulfur in the case of adding conventional flotation reagents, resulting in low grade of sulfur concentrate
In order to further obtain high-grade sulfur products, thermal filtration process is generally used after flotation, and a large amount of sulfur will be lost in the filter cake through thermal filtration, resulting in low recovery rate of elemental sulfur and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a method for zinc oxygen pressure leaching of high-sulfur slag to recover sulfur, comprising the following steps:

[0036] (1) Zinc oxygen pressure leaching high-sulfur slag containing sulfur, zinc, lead, iron, silver and other elements is added to the flotation cell, mixed with water in a certain proportion, and the zinc oxygen pressure leaching high-sulfur slag with a concentration of 20% is obtained Slag pulp, which contains 46.21% sulfur, 4.31% zinc, 1.92% lead, 15.40% iron, and 220g / t silver;

[0037] (2) Carry out one section of blank roughing in the zinc-oxygen pressure leaching high-sulfur slag slurry prepared in step (1), control the rotating speed and maintain the foam layer thickness, obtain roughing I concentrate and roughing I tailings;

[0038](3) Add lime 5kg / t to the roughing tailings prepared in step (2), carry out two stages of roughing, add inhibitor, collector and foaming agent to roughing, wherein roughing II adopts sodium s...

Embodiment 2

[0041] This embodiment provides a method for zinc oxygen pressure leaching of high-sulfur slag to recover sulfur, comprising the following steps:

[0042] (1) Zinc oxygen pressure leaching high-sulfur slag containing elements such as sulfur, zinc, lead, iron, silver, etc., is added to the flotation cell, mixed with water according to a certain ratio, and the zinc oxygen pressure leaching high-sulfur slag with a concentration of 32% is obtained Slag pulp, which contains 56.68% of sulfur, 2.28% of zinc, 2.32% of lead, 12.86% of iron, and 140g / t of silver;

[0043] (2) Carry out one section of blank roughing in the zinc-oxygen pressure leaching high-sulfur slag slurry prepared in step (1), control the rotating speed and maintain the foam layer thickness, obtain roughing I concentrate and roughing I tailings;

[0044] (3) Add lime 7kg / t to the roughing tailings prepared in step (2), carry out two stages of roughing, add inhibitor, collector and foaming agent in the roughing proces...

Embodiment 3

[0047] The invention provides a method for recovering sulfur from zinc-oxygen pressure leaching of high-sulfur slag, comprising the following steps:

[0048] (1) Put the zinc oxygen pressure leaching high-sulfur slag containing sulfur, zinc, lead, iron, silver and other elements into the flotation tank, and mix it with water in a certain proportion to obtain a zinc oxygen pressure leaching high-sulfur slag with a concentration of 40%. Slag pulp, which contains 33.40% sulfur, 3.08% zinc, 1.90% lead, 10.23% iron, and 124g / t silver;

[0049] (2) Carry out one section of blank roughing in the zinc-oxygen pressure leaching high-sulfur slag slurry prepared in step (1), control the rotating speed and maintain the foam layer thickness, obtain roughing I concentrate and roughing I tailings;

[0050] (3) add lime 5kg / t in the roughing tailings prepared in step (2), carry out two sections of roughing, add inhibitor, collector and foaming agent in the roughing process, wherein roughing 1 ...

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Abstract

The invention discloses a method for recovering sulfur from zinc oxygen pressure leached high-sulfur slag, and belongs to the field of non-ferrous metal metallurgy. The method comprises the steps of firstly, performing blank roughing; adding lime into roughing tailings for size mixing, then adding a combined inhibitor of sodium sulfide, zinc sulfate and sodium sulfite, a collecting agent and a foaming agent, and carrying out two-stage dosing roughing; and after the concentrates I, II and III obtained through roughing are combined and mixed with lime, adding an inhibitor for second-stage concentration, wherein the concentrate II obtained through concentration is sulfur concentrate. According to the invention, separation of sulfur from minerals such as zinc sulfide, sulfate and silicate in the zinc oxygen pressure leaching high-sulfur slag is effectively achieved, the grade of sulfur products is improved, stockpiling of the zinc oxygen pressure leaching slag is reduced, favorable conditions are provided for comprehensive recovery of various elements, valuable elements such as lead, zinc and silver enter the tailing slag, the flotation tailings and the lead concentrate can be subjected to lead smelting together after ore blending, and then valuable elements such as lead, zinc and silver in the flotation tailings are further recycled.

Description

Technical field: [0001] The invention belongs to the field of non-ferrous metal smelting, and in particular relates to a method for recovering sulfur from zinc-oxygen pressure leaching of high-sulfur slag. Background technique: [0002] Sulfur products mainly come from natural sulfur mines and recycled sulfur. Since the 1990s, the global production of natural sulfur has continued to decline, while the amount of recycled sulfur has increased significantly. my country is a big sulfur consumption country, but domestically produced sulfur is relatively small, and the demand for sulfur is highly dependent on foreign countries. From a global perspective, the Middle East, North and South America, and the former Soviet Union countries are the main sources of sulfur supply. Domestic sulfur mainly comes from petroleum, natural gas, coal chemical industry and other inorganic salt chemical industry. Compared with natural sulfur ore, recovered sulfur has the advantages of high purity, ...

Claims

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Application Information

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IPC IPC(8): C01B17/027
CPCC01B17/027
Inventor 张邦胜刘贵清张帆王芳龚卫星解雪张仲皓吴祖璇刘昱辰
Owner XUZHOU GUOMAO VALUABLE & RARE METAL COMPREHENSIVE UTILIZATION INST
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