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Floating and smelting combined method for air-granulating lead smelting slag and utilizing waste heat

A combination of dressing and smelting, lead smelting technology, applied in the field of dressing and smelting, can solve the problems of complex dust collection system, high energy consumption of fuming furnace, heat loss, etc., and achieve the effect of simple processing flow, low production cost and high utilization rate of heat energy

Inactive Publication Date: 2013-05-08
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the high energy consumption of the fuming furnace, the complexity of the dust collection system and the high pollution in the existing lead slag treatment, especially in the period of the downturn in the lead and zinc price market, the heat loss caused by the direct water quenching of the lead slag without treatment and the Environmental problems caused by stockpiling and landfilling, the present invention aims to provide a combination method of separation and smelting of lead smelting slag by air quenching granulation and waste heat utilization, which can fundamentally solve the problem of high energy consumption of fuming furnaces and dust collection systems. Complicated and high-pollution problems, making full use of the high-temperature air after air-quenching of lead smelting slag is directly used in the waste heat boiler to produce steam, and the particles after granulation do not need to be crushed separately, and there is no need for separate heating to provide vulcanization conversion heat energy, which is unmatched by traditional technologies the superiority of

Method used

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  • Floating and smelting combined method for air-granulating lead smelting slag and utilizing waste heat
  • Floating and smelting combined method for air-granulating lead smelting slag and utilizing waste heat

Examples

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Effect test

Embodiment 1

[0055] Embodiment 1: blast furnace lead smelting slag

[0056] Take 1000g of blast furnace water-quenched slag, its chemical composition is: Pb4.0%, Zn18.79%, Fe23.48%, Si9.2%, Ca7.2%, heat treatment on blast furnace slag at 1200 °C for 1h, The molten slag is quickly taken out and poured into the granulator along the chute, and the wind speed is adjusted so that the particle size of the granulated slag is controlled below 1.5mm. After the material is discharged from one end of the granulator, it enters the vulcanization reaction vessel. At the same time, 20% pyrite and 6% coke are added. The temperature is controlled at 800°C and kept at a constant temperature for 2.5 hours. After cooling slowly to below 200°C, it is water quenched. After some materials were dried, the sulfidation rates of lead and zinc were measured to be 82% and 85% respectively through chemical analysis, and the remaining materials were subjected to grinding and flotation tests to finally obtain lead-zinc m...

Embodiment 2

[0057] Example 2: Direct reduction of smelting slag by liquid high-lead slag

[0058] Get 1500g of liquid high lead slag direct reduction smelting slag, its chemical composition is: Pb2.50%, Zn22.79%, Fe21.48%, Si10.2%, Ca9.2%, blast furnace slag is added at 1200 ℃ After warming for 1 hour, the molten slag was quickly taken out and poured into the granulator along the chute, and the wind speed was adjusted so that the particle size of the granulated slag was controlled below 2.0mm. After the material is discharged from one end of the granulator, it enters the vulcanization reaction vessel. At the same time, 25% pyrite and 5% coke are added. The temperature is controlled at 850°C and kept at a constant temperature for 3.0 hours. After cooling slowly to below 200°C, it is water quenched. After some materials were dried, chemical analysis showed that the sulfuration rates of lead and zinc were 85% and 87%, respectively. The rest of the materials were subjected to grinding and flo...

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Abstract

The invention discloses a floating and smelting combined method for air-granulating lead smelting slag and utilizing waste heat and belongs to the field of floating and smelting. Aims at solving the problems that a fuming furnace is high in energy consumption, a dust collection system is complex and pollution is high, the method disclosed by the invention comprises the following steps of: a) conveying, namely conveying lead smelting slag to an air-granulating device; b) carrying out air-granulating on the lead smelting slag to obtain granulated slag; c) vulcanizing and roasting, including the steps of transferring the granulated slag into a vulcanizing reactor and adding a vulcanizing agent and a reducing agent to carry out vulcanization reaction; d) cooling, including the steps of cooling a material after vulcanizing and carrying out water quenching after temperature of the material is reduced to 200 DEG C or below to obtain water-quenched slag; and e) floating and grinding, including the steps of grinding and grading the water-quenched slag to obtain the material with the size of 45mum or below and then floating the water-quenched slag in a floating system to obtain a lead and zinc bulk concentrate. By adopting the floating and smelting combined method disclosed by the invention, roasting raw material does not need to be smashed, conversion rate of lead vulcanization and zinc vulcanization are respectively more than 80% without independent heating, and the floating and smelting combined method disclosed by the invention has the characteristics of good vulcanized product floatation performance, low processing cost, less pollution and high metal recycling rate.

Description

technical field [0001] The invention relates to the field of dressing and smelting, in particular to a combined method of air-quenching granulation of lead smelting slag, direct use of waste heat for sulfidation transformation of lead-zinc minerals, water quenching of roasted products, ore grinding and flotation. Background technique [0002] Blast furnace and liquid high-lead slag direct reduction smelting produces a large amount of lead-zinc slag, and the current treatment process is mainly based on fuming furnace volatilization. In the production process, a large amount of coke or pulverized coal needs to be added to strengthen the reduction and volatilization of metals, resulting in high energy consumption, complex dust collection system, and serious dust pollution, especially when the market price of lead and zinc is sluggish. The heat loss caused by direct water quenching of lead smelting slag without treatment, storage and landfill have brought serious problems of hea...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B1/00C22B1/26F27D17/00
CPCY02P10/25
Inventor 刘维覃文庆蔡练兵刘三军郑永兴孔燕罗虹霖
Owner CENT SOUTH UNIV
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