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Method for producing ferronickel fine powder and zinc oxide by rotary kiln

A rotary kiln and zinc oxide technology, which is applied to chemical instruments and methods, rotary drum furnaces, furnace types, etc., can solve the problems of large occupied area of ​​rotary kiln, poor quality of zinc oxide, large investment, etc., and achieve high reduction efficiency and recovery The effect of high efficiency and high combustion efficiency

Active Publication Date: 2018-04-10
ZHEJIANG XINSHIDAI ZHONGNENG RECYCLING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the output of the rotary kiln is very large, even the daily output of a single kiln can reach more than 1,000 tons, and the yield of various zinc and ferronickel is not bad, but the rotary kiln occupies a large area and requires a large investment, and a large amount of smoke and dust will enter the product during recycling. , so that the quality of zinc oxide is relatively poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1), ingredients:

[0027] 1000kg contains leaching slag, iron slag, nickel, zinc, and iron-containing waste slag generated during the treatment of ferrous metals and precious metal waste, of which iron 25.82%, nickel 0.56%, zinc 12.51%, metals other than nickel, iron, and zinc The content is 0.68%, mixed with 100kg of coke and 100kg of anthracite, and the waste is ground with a ball mill to a fineness of 3.2mm. Add 50kg of furnace dust sedimentation material and 20kg of tail gas dust collection material of the rotary kiln. Among them, coke and anthracite are common products on the market.

[0028] 2), preheating:

[0029] The mixture was heated to 100°C. The heat source of heating comes from the heat release of the rotary kiln and the cooling of the slag.

[0030] 3) Roasting:

[0031] The preheated mixture enters the rotary kiln through the feeder, and the mixed gas of high-temperature steam and air is introduced. The ratio of water steam and air is 1:10. The heat...

Embodiment 2

[0035] 1), ingredients:

[0036] 1000kg contains leaching slag, iron slag, nickel, zinc, and iron-containing waste slag generated during the treatment of ferrous metals and precious metal waste, of which iron 25.82%, nickel 0.56%, zinc 12.51%, metals other than nickel, iron, and zinc The content is 0.68%, mixed with 200kg of coke and 200kg of anthracite, and the waste is ground by a ball mill, and the fineness is required to be 5.6mm. Add 65kg of furnace dust sedimentation material and 25kg of tail gas dust collection material of the rotary kiln. Among them, coke and anthracite are common products on the market.

[0037] 2), preheating:

[0038] The mixture was heated to 500°C. The heat source of heating comes from the heat release of the rotary kiln and the cooling of the slag.

[0039] 3) Roasting:

[0040] The preheated mixture enters the rotary kiln through the feeder, and the mixed gas of high-temperature steam and air is introduced, the ratio of water steam and air ...

Embodiment 3

[0044] 1), ingredients:

[0045] 1000kg contains leaching slag, iron slag, nickel, zinc, and iron-containing waste slag generated during the treatment of ferrous metals and precious metal waste, of which iron 25.82%, nickel 0.56%, zinc 12.51%, metals other than nickel, iron, and zinc The content is 0.68%, mixed with 100kg of coke and 200kg of anthracite, and the waste is ground by a ball mill with a fineness of 4.9mm. Add 55kg of furnace dust sedimentation material and 22kg of tail gas dust collection material of the rotary kiln.

[0046] 2), preheating:

[0047] The mixture was heated to 250°C. The heat source of heating comes from the heat release of the rotary kiln and the cooling of the slag.

[0048] 3) Roasting:

[0049] The preheated mixture enters the rotary kiln through the feeder, and the mixed gas of high-temperature steam and air is introduced, the ratio of water steam and air is 1:25, and the heat source of the mixed gas of high-temperature steam and air comes f...

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PUM

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Abstract

The invention discloses a method for producing nickel iron fine powder and zinc oxide through a rotary kiln. The method comprises the following steps that leaching residues, iron residues and waste residues containing nickel, zinc and iron generated in the treatment process of waste materials containing non-ferrous metals and noble metals are added into coke, blind coal and other accessory materials to be mixed, be preheated and enter the rotary kiln; mixed gas of high-temperature vapor and air is introduced into the bottom of the rotary kiln; generated furnace gas passes through a heated gas-solid separator to obtain furnace dust settling materials and smoke; the smoke is cooled and received to obtain a zinc oxide product; tail gas is subjected to dust collection and spray dedusting and finally enters a desulfurizing tower to be desulfurized; the furnace dust settling materials and tail gas dust receiving materials are fed back to the burdening procedure; and sintered furnace residues are subjected to water quenching, ball milling and magnetic separation, and then the nickel iron fine powder is obtained. Residual magnetic separation residuals contain few metals which are vitrified and do not dissolve out after being sintered at a high temperature, and the magnetic separation residuals mainly contain calcium, magnesium and silicon and can serve as building material accessory products to be delivered to the building industry and reused.

Description

technical field [0001] The invention relates to the field of resource recycling, in particular to the technology of producing ferronickel fine powder and zinc oxide from various waste materials containing ferrous metals. Background technique [0002] In recent years, on the one hand, my country has a large demand gap for zinc, ferronickel and other resources, and the output is also large, but on the other hand, due to inadequate smelting technology, a large amount of industrial waste ash containing a small amount of important metals such as zinc, iron, and nickel has been produced. Direct discharge of industrial waste residues into the environment will cause energy and resources to be wasted again and pollute the environment. Due to the relatively high cost of recycling, low efficiency, and unqualified recycling technology, there are still few enterprises that can effectively recycle waste residue on a large scale. [0003] The methods of direct production of zinc oxide are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02B03C1/02C22B23/02C22B19/38
CPCB03C1/02C22B1/02C22B19/38C22B23/023
Inventor 陶伟胜杜广荣马维华贾跃花
Owner ZHEJIANG XINSHIDAI ZHONGNENG RECYCLING TECH CO LTD