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A method for producing spherical zinc powder using hot-dip galvanizing slag

A hot-dip galvanizing slag, spherical technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of high oxidation degree of zinc powder, large one-time investment, different particle sizes, etc., to improve the fineness of zinc powder, Good effect, uniform particle size effect

Active Publication Date: 2018-05-04
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are disadvantages such as large one-time investment in production, large production capacity, low production efficiency, high energy consumption, and high maintenance costs. The zinc powder produced has a high degree of oxidation, sticking phenomenon, and different particle sizes.
On the other hand, in the process of galvanizing steel sheets in the hot-dip galvanizing production line of the iron and steel plant, a large amount of hot-dip galvanizing slag will inevitably be produced, which is solid hazardous waste with a zinc content ≥ 90%, and the main impurities are Al and Fe. Contains other impurities such as Pb and Cd, which is different from other zinc-containing wastes, and cannot be smelted indiscriminately from ores in non-ferrous metals

Method used

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  • A method for producing spherical zinc powder using hot-dip galvanizing slag
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  • A method for producing spherical zinc powder using hot-dip galvanizing slag

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Effect test

Embodiment 1

[0032] The method for utilizing hot-dip galvanizing slag to produce spherical zinc powder comprises the following steps:

[0033] Step 1, Ingredients:

[0034] The main components of hot-dip galvanizing slag are shown in Table 1. After coarse crushing and screening with a diameter of less than or equal to 3cm, weigh 100g;

[0035] The main chemical composition of table 1 embodiment 1 hot-dip galvanizing slag

[0036] Element

[0037] Step 2, jet smelting evaporation:

[0038] Put the material into the crucible and place it at the bottom of the sealed heat-resistant reaction device. The blowing pipe is fed with high-purity argon gas. The gas flow rate is 5L / min. After heating to 500°C for 10 minutes, the temperature is raised to 1000°C, and the gas flow rate becomes 15L. / min, stop heating after all the Zn in the material evaporates, and the residue stays in the crucible to cool naturally, wherein, the distance between the spray pipe and the surface of the liquid ma...

Embodiment 2

[0047] The method for utilizing hot-dip galvanizing slag to produce spherical zinc powder comprises the following steps:

[0048] Step 1, Ingredients:

[0049] The main components of hot-dip galvanizing slag are shown in Table 3. After coarse crushing and screening with a diameter of less than or equal to 3cm, weigh 100g;

[0050] The main chemical composition of table 3 embodiment 2 hot-dip galvanizing slag

[0051] Element

Zn

Fe

Al

Pb

Mass percentage, %

95.66

1.61

2.43

0.001

[0052] Step 2, jet smelting evaporation:

[0053] Put the material into the crucible and place it at the bottom of the sealed heat-resistant reaction device. Nitrogen gas is introduced into the blowing pipe, and the gas flow rate is 8L / min. After heating to 550°C for 10 minutes, the temperature is raised to 975°C, and the gas flow rate becomes 11L / min. Stop heating after all the Zn in the material evaporates, and the residue is left in the crucible to ...

Embodiment 3

[0071] The method for utilizing hot-dip galvanizing slag to produce spherical zinc powder comprises the following steps:

[0072] Step 1, Ingredients:

[0073] The main components of hot-dip galvanizing slag are shown in Table 7. After coarse crushing and screening with a diameter of less than or equal to 3cm, weigh 100g;

[0074] The main chemical composition of table 7 embodiment 3 hot-dip galvanizing slag

[0075] Element

Zn

Fe

Al

Pb

Mass percentage, %

94.86

1.87

2.76

0.001

[0076] Step 2, jet smelting evaporation:

[0077] Put the material into the crucible and place it at the bottom of the sealed heat-resistant reaction device. The blowing pipe is fed with high-purity argon gas. The gas flow rate is 5L / min. After heating to 600°C for 10 minutes, the temperature is raised to 1000°C, and the gas flow rate becomes 13L. / min, stop heating after all the Zn in the material evaporates, and the residue stays in the crucible to c...

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Abstract

The invention discloses a method for producing spherical zinc powder by using hot-dip galvanizing slag, which belongs to the technical field of nonferrous metal recovery. The method is as follows: (1) batching; (2) blowing smelting evaporation: put the material in a sealed heat-resistant reaction device, inject inert gas or nitrogen into the blowing pipe, and heat at a constant temperature to evaporate all the Zn in the material; (3) quickly Uniform cooling: High-purity zinc vapor enters the condensing device with inert gas or nitrogen, and after sieving, spherical zinc powder with a particle size of 1-4 μm is obtained. In the method of the invention, the raw material hot-dip galvanizing slag belongs to the secondary utilization product, which reduces the raw material cost by 30% compared with the traditional process; it does not need to remove impurities in advance, and the process is simple, the process is short, the investment is small, and there is no pollution; the whole process flow is completely Airtight, the quality of the ultrafine zinc powder produced is stable, no oxidation, no bonding, the main technical indicators are: the mass content of total zinc is ≥ 99%, and it can be used as zinc-rich paint or as a raw material for replacing reducing agents.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal recycling, in particular to a method for producing spherical zinc powder by utilizing hot-dip galvanizing slag. Background technique [0002] In the prior art, the main production methods for producing ultrafine zinc powder include rectification, ball milling, atomization, electrolysis, and evaporation-condensation. Its raw material is mainly rough zinc or high-purity zinc ingot, its zinc content is more than 98%, strict requirements on impurities, such as patent CN 100420527C "production equipment and preparation method of high-purity ultra-fine active zinc powder" and patent CN 102029398 "a A kind of high-purity zinc powder preparation method " described. Industrial production mainly adopts the rectification method, and its main production process is: smelting and refining furnace impurity removal-melting furnace heat preservation-rectification lead column rectification-condenser cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/12B22F1/00
CPCB22F9/12B22F1/065
Inventor 薛向欣卜二军杨合高子先
Owner NORTHEASTERN UNIV LIAONING
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