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Method for recovering carbon, iron and zinc from blast furnace gas dust

A technology for recovering carbon from blast furnace gas ash is applied in the field of recovering carbon, iron and zinc from blast furnace gas ash. low cost effect

Active Publication Date: 2020-02-21
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for recovering carbon from blast furnace gas ash in order to overcome the problems of large equipment investment, large pollution, high energy consumption, recovery of only a single valuable component and inability to remove zinc from gas ash in the prior art. iron and zinc method

Method used

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  • Method for recovering carbon, iron and zinc from blast furnace gas dust
  • Method for recovering carbon, iron and zinc from blast furnace gas dust

Examples

Experimental program
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Effect test

Embodiment 3

[0057] Example 3 A blast furnace gas ash from an ironworks in Yunnan was selected. The grade of TFe in the blast furnace gas ash was 30.15%, the grade of Zn was 6.54%, and the grade of C was 20.10%. The analysis of the main components is shown in Table 2.

[0058] Table 2

[0059] element TF CaO MgO SiO 2

Embodiment 1

[0061] (1) the blast furnace gas ash is modulated into a concentration of 35% by weight ore slurry in a mixing tank, and mixed with diesel oil and terpineol oil, the amount of diesel oil is 600g / t, and the amount of terpineol oil is 100g / t;

[0062] (2) roughing the mixed ore slurry obtained in step (1) to obtain the first carbon concentrate and roughing tailings;

[0063] (3) Add diesel oil and terpineol oil to step (2) gained roughing tailings, the amount of diesel oil is 200g / t, and the amount of terpineol oil is 25g / t; Mix and then sweep to obtain the second carbon concentrate and scavenging tailings;

[0064] (4) Grinding the scavenging tailings with a particle size of 67.86% by weight less than 0.074mm obtained in step (3) in a tower mill, and then feeding into a primary hydrocyclone (100mm in diameter) for classification, And control the primary classification particle size to 0.038mm and the ore feeding pressure to 0.2MPa to obtain primary grit with a particle size gr...

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Abstract

The invention relates to the field of mineral processing engineering, and discloses a method for recovering carbon, iron and zinc from blast furnace gas dust. The method includes the following steps that (1) the gas dust is evenly mixed with a collecting agent and a foaming agent; (2) rough concentration is performed on evenly-mixed pulp, and carbon concentrate and rough tailings are obtained; (3)the collecting agent and the foaming agent are added to the rough tailings for scavenging, and carbon concentrate and scavenging tailings are obtained; (4) the scavenging tailings are ground and fedinto a hydrocyclone for classification, and settling sand and overflow products are obtained; (5) the overflow products are fed into the hydrocyclone for classification, and overflow products and settling sand are obtained; (6) zinc concentrate is obtained from the overflow products, magnetic separation is performed on the settling sand, and iron concentrate is obtained. By the aid of the method,useful components, including the carbon, the iron and the zinc, in the blast furnace gas dust can be recovered simultaneously, and meanwhile, the tailings can be used as cement production raw materials, so that comprehensive utilization of the blast furnace gas dust is realized; and the method has the characteristics of low energy consumption, low pollution, high zinc removal rate and low cost.

Description

technical field [0001] The invention relates to the field of mineral processing engineering, in particular to a method for recovering carbon, iron and zinc from blast furnace gas ash. Background technique [0002] Blast furnace gas ash is the fine particles of raw material dust carried by the blast furnace flue gas in the process of blast furnace ironmaking. It is the product obtained by gravity dust collection. , iron, zinc and other valuable elements, with a high recovery rate and value. my country's iron and steel enterprises produce a large amount of blast furnace gas ash every year, which brings great difficulties to the enterprise's stockpiling. Its comprehensive added value, reducing environmental pollution and realizing clean production have become major issues facing metallurgical enterprises. [0003] The traditional gas ash treatment process directly returns to the ironmaking sintering process as a sintering raw material. In this method, zinc is cyclically enrich...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/06C22B7/02C22B19/30
CPCB03B9/06C22B7/02C22B19/30Y02W30/52Y02P10/20
Inventor 吴宁杨道广
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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