Method for processing dust with zinc of electric furnace

A treatment method and electric furnace technology, applied in the field of metallurgy, can solve the problems of no recovery of valuable metal resources, poor economic benefits, and secondary pollution of the environment, so as to achieve no environmental pollution of valuable metal resources, realize secondary utilization, and be economical benefit effect

Inactive Publication Date: 2007-12-26
NANJING NANGANG IND DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main problems in the above-mentioned methods for treating zinc-containing electric furnace dust are: either no valuable metal resources are recovered, or the treatment cost is high, or secondary pollution is caused to the environment, or the value of the product obtained after treatment is low, and the economic benefit is poor

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  • Method for processing dust with zinc of electric furnace

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Effect test

Embodiment 1

[0049] The flow process of this embodiment is shown in Figure 1, a kind of method that adopts the method for processing zinc-containing electric furnace dust by the direct reduction roasting method of carbon pellets, according to the following steps:

[0050] ① Mix the zinc-containing electric furnace dust in silo 1 and the coke in batching silo 2 into pellets in the mixer 3. The particle size of the coke is 40 mesh, and the pelleting time is 25 minutes. Quantity C / O was 1.1. The zinc-containing electric furnace dust is made into carbon-containing pellets 4 with a pellet diameter of 12 mm. The carbon-containing pellets 4 are introduced into a dryer 5 for drying, and the dried carbon-containing pellets 4 are introduced into a rotary hearth furnace 6 .

[0051] ②The material layer thickness of the carbon-containing pellets 4 in the rotary hearth furnace 6 is 30 mm. In the rotary hearth furnace 6, the dried carbon-containing pellets 4 are subjected to high-temperature reduction ...

Embodiment 2

[0057] The flow process of this embodiment is shown in Figure 1, a kind of method that adopts the method for processing zinc-containing electric furnace dust by the direct reduction roasting method of carbon pellets, according to the following steps:

[0058] ① Mix the zinc-containing electric furnace dust in silo 1 and the coke in batching silo 2 into pellets in the mixer 3. The particle size of the coke is 60 mesh, and the pelletizing time is 30 minutes. Quantity C / O is 1.2. The zinc-containing electric furnace dust was made into carbon-containing pellets 4 with a pellet diameter of 13 mm. The carbon-containing pellets 4 are introduced into a dryer 5 for drying, and the dried carbon-containing pellets 4 are introduced into a rotary hearth furnace 6 .

[0059] ②The material layer thickness of the carbon-containing pellets 4 in the rotary hearth furnace 6 is 40mm. In the rotary hearth furnace 6, the dried carbon-containing pellets 4 are subjected to high-temperature reduction...

Embodiment 3

[0065] The flow process of this embodiment is shown in Figure 1, a kind of method that adopts the method for processing zinc-containing electric furnace dust by the direct reduction roasting method of carbon pellets, according to the following steps:

[0066] ① Mix the zinc-containing electric furnace dust in silo 1 and the coke in batching silo 2 into pellets in the mixer 3. The particle size of the coke is 100 mesh, and the pelletizing time is 35 minutes. Quantity C / O is 1.3. The zinc-containing electric furnace dust is made into carbon-containing pellets 4 with a pellet diameter of 15 mm. The carbon-containing pellets 4 are introduced into a dryer 5 for drying, and the dried carbon-containing pellets 4 are introduced into a rotary hearth furnace 6 .

[0067] ②The material layer thickness of the carbon-containing pellets 4 in the rotary hearth furnace 6 is 50mm. In the rotary hearth furnace 6, the dried carbon-containing pellets 4 are subjected to high-temperature reduction...

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Abstract

This invention discloses a method for treating zinc-containing dust generated in electric furnace. The method comprises: mixing zinc-containing dust with carbon, balling, oven-drying to obtain carbon-containing balls, adding into a converter, calcining at a high temperature to reduce into zinc vapor, introducing into an oxidation chamber, introducing air to oxidize zinc vapor into zinc oxide vapor, introducing into a cooling chamber, cooling to obtain zinc oxide powder, introducing into a dust collection chamber, collecting zinc oxide powder, introducing the carbon-containing balls into a cooler, and cooling to obtain semi-metallized balls. The zinc oxide powder has purity above 90%; the semi-metallized balls have metallization rate above 60%, TFe content above 50%, and zinc content below 2%. The method has such advantages as high utility of zinc-containing dust, low cost and no pollution.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a treatment method for zinc-containing electric furnace dust. Background technique [0002] Electric arc furnace steelmaking produces 1% to 2% of the furnace charge dust, which contains not only iron, but also metal elements such as lead, zinc, cadmium, chromium and nickel. The U.S. Environmental Protection Agency (EPA) classifies this type of dust as hazardous waste (K061). It must be treated as harmless waste before it can be landfilled. For this reason, all countries attach great importance to the treatment and comprehensive utilization of electric furnace dust, and carry out various researches, hoping to develop a technology that is economical, can recover valuable metal resources, and has no environmental pollution. At present, the commonly used technologies for zinc-containing electric furnace dust treatment are: fire method, wet method, combination of fire method and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B19/34
CPCY02P10/20
Inventor 刁岳川张丙怀王朝东伍成波李志强孔繁杰李翔张悦
Owner NANJING NANGANG IND DEV CO LTD
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