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Method for coprocessing zinc-contained leaching residues through steel mill dezincification furnace

A technology for zinc leaching slag and steel mills, which is applied in the field of co-processing zinc-containing leaching slag in steel plant dezincification furnaces. It can solve problems such as lack of zinc leaching slag treatment equipment, pollution of zinc-containing leaching slag, and processing capacity can not keep up. The value of resource utilization and the economic benefits of the enterprise, the effect of reducing equipment investment and expanding the scope of use

Active Publication Date: 2016-02-17
CHINA IRON & STEEL RES INST GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above analysis, the present invention aims to provide a method for co-processing zinc-containing leaching slag by using a dezincification furnace in a steel plant to solve the serious pollution of existing zinc-containing leaching slag and the lack of domestic special zinc slag treatment equipment leading to insufficient processing capacity. question on

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The main components of the zinc-containing leaching slag used in this example are shown in Table 1. The smelting equipment for co-processing zinc-containing leaching slag is a steel mill dust rotary kiln with a length of 36m and an inner diameter of 1.8m, and a steel mill dust treatment capacity of 50,000 tons per year. The main components of blast furnace dust as the main raw material are shown in Table 2. The smelting reducing agent adopts third-grade coke powder, and its main components are shown in Table 3.

[0031] Table 1 Main components of zinc-containing leaching slag (dry basis) (wt%)

[0032] Zn

Pb

S

Fe

SiO 2

Al 2 o 3

10.5

6.7

12.7

13.5

18.3

3.4

[0033] Table 2 Main components of blast furnace dust (wt%)

[0034] TF

CaO

SiO 2

MgO

Al 2 o 3

C

Pb

Zn

S

35.2

6.1

12.0

4.2

1.9

16.3

0.35

4.52

0.58

[003...

Embodiment 2

[0045]Co-processing of zinc-containing leach slag in a dusty rotary hearth furnace of a steel mill. The middle diameter of the rotary hearth furnace used is 21m; the inner width of the furnace is 5m, and the dust handling capacity is 200,000 tons / year. The main components of zinc leaching slag are shown in Table 1, and the main components of steel mill dust are shown in Table 4. The reducing agent is anthracite, with a calorific value of 5500kCal / kg and a fixed carbon content of 73%.

[0046] Table 4 Main components of steel mill dust (wt%)

[0047] TF

C

SiO 2

CaO

MgO

Al 2 o 3

Zn

Pb

S

51.2

5.8

2.3

11.2

1.7

0.8

0.52

0.12

0.32

[0048] The smelting steps are as follows:

[0049] The first step: the used zinc-containing leaching slag and coke powder are mixed into the steel mill dust, wherein the amount of zinc-containing leaching slag added accounts for 2.0% of the quality of the steel...

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Abstract

The invention relates to a method for coprocesisng zinc-contained leaching residues through a steel mill dezincification furnace. The method comprises the steps that 1, the zinc-contained leaching residues and a reducing agent are added into steel mill dust in a prepared manner; 2, roller press briquetting or disc balling machine balling molding is adopted; 3, waste hot gas is adopted for drying; 4, dried materials are fed into a steel mill dust smelting furnace to be smelted, the smelting temperature is 1150-1250 DEG C, and the standing time inside the furnace is 25-120 min; 5, enriched zinc-contained and lead-contained ash inside cloth bag fly ash is recycled; and 6, metallized pellets obtained from the steel mill dezincification furnace are cooled. The zinc-contained leaching residues are co-processed by means of the steel mill dust processing equipment, and the problem of secondary pollution caused by zinc-contained leaching residues or zinc-contained electroplating sludge generated in the colored, chemical and other industries is solved.

Description

technical field [0001] The present invention relates to the field of hazardous solid waste treatment, in particular to a co-disposal method for zinc-containing and lead-containing hazardous solid waste produced in nonferrous metals and chemical industries, and in particular to a method for co-processing zinc-containing leached slag in a dezincification furnace in a steel plant method. Background technique [0002] Zinc-containing leaching slag is a main type of zinc- and lead-containing hazardous solid waste, mainly from non-ferrous metal smelting process and chemical production process, including leaching leaching slag obtained from calcine of sulfide concentrate with dilute sulfuric acid , also includes zinc-containing electroplating sludge produced by hot-dip galvanizing, metal surface heat treatment and processing, which is mainly composed of iron and zinc sulfate and zinc ferrite, and contains heavy metals such as lead, copper, gold, and silver. The zinc in the zinc-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/14C22B7/00C22B13/02C22B19/30
CPCC22B1/14C22B7/001C22B13/025C22B19/30Y02P10/20
Inventor 郭培民赵沛庞建明潘聪超刘云龙
Owner CHINA IRON & STEEL RES INST GRP
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