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Method for preparing high-grade zinc oxide by utilizing cast iron dust

A zinc oxide, high-grade technology, applied in blast furnaces, blast furnace details, process efficiency improvement, etc., to achieve high economic benefits, increase application range, and improve product grades

Active Publication Date: 2013-11-27
HEZHANG LINGXUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]The above two methods have many disadvantages, for example: the content of zinc oxide produced by rotary kiln is low, the color is poor, it can only be used as primary raw material, and the added value of the product is low ; Although the zinc oxide produced by the traditional Webster furnace production line is improved compared with the rotary kiln, there are still products with low purity and color deviation, which can only be used as raw materials for low-grade ceramics. At the same time, some valuable elements such as lead , indium, silver, bismuth, etc. cannot be recycled, the added value is also not high, and the economic benefits are poor

Method used

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  • Method for preparing high-grade zinc oxide by utilizing cast iron dust
  • Method for preparing high-grade zinc oxide by utilizing cast iron dust
  • Method for preparing high-grade zinc oxide by utilizing cast iron dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Preparation of 98% zinc oxide from cast iron dust with high content of lead, indium, silver and bismuth

[0038] Select a batch of 2000 kg of cast iron dust, the chemical composition of which is shown in Table 1, and carry out the test according to the following steps:

[0039] Table 1 Chemical composition of dust removal ash

[0040] Element content(%) Element content(%) Element content(%) Element content(%) Zn 25.31 Pb 6.72 F 0.40 Cl 0.60 Fe 22.2 mn 2.1 Si 3.3 Mg 0.72 sn 0.01 Al 1.0 Ca 2.3 C 9.1 In 0.03 Bi 0.02 Ag 0.02 h 2 o 11

[0041] Step a: Mix the dedusted ash with 1000 kg of powdered anthracite coal and 300 kg of lime in a mixer for 10 minutes to achieve a uniform mixture, transport it to a briquetting machine and press it into a 5 cm briquette, and dry it until the water content is about 8%. Powdered anthracite is mixed in as reducing agent.

[0042]Step b: Throw...

Embodiment 2

[0052] Example 2: Preparation of 98% zinc oxide from cast iron dust with low content of lead, indium, silver and bismuth

[0053] Select a batch of 2000 kg of cast iron dust, the chemical composition of which is shown in Table 3, and carry out the test according to the following steps:

[0054] Table 3 Chemical composition of dust removal ash

[0055] Element content(%) Element content(%) Element content(%) Element content(%) Zn 45.31 Pb 1.72 F 0.56 Cl 0.42 Fe 17.9 mn 1.2 Si 2.83 Mg 0.57 sn 0.015 Al 1.8 Ca 1.69 C 7.3 In 0.012 Bi 0.013 Ag ＜0.001 h 2 o 19.2

[0056] Step a: Mix the dedusted ash with 1000 kg of powdered anthracite coal and 300 kg of lime in a mixer for 10 minutes to achieve a uniform mixture, transport it to a briquetting machine and press it into a 5 cm briquette, and dry it until the water content is about 8%. Powdered anthracite is mixed in as reducing agent.

[0057] Step...

Embodiment 3

[0067] Example 3: Preparation of 98% zinc oxide from cast iron dust with moderate lead, indium, silver and bismuth content

[0068] Select a batch of 2000 kg of cast iron dust, the chemical composition of which is shown in Table 1, and carry out the test according to the following steps:

[0069] Table 5 Chemical composition of dust removal ash

[0070] Element content(%) Element content(%) Element content(%) Element content(%) Zn 32.03 Pb 3.72 F 0.51 Cl 0.68 Fe 15.76 mn 2.78 Si 4.1 Mg 0.62 sn 0.013 Al 1.51 Ca 3.12 C 8.45 In 0.024 Bi 0.018 Ag 0.021 h 2 o 9.00

[0071] Step a: Mix the dedusted ash with 1000 kg of powdered anthracite coal and 300 kg of lime in a mixer for 10 minutes to achieve a uniform mixture, transport it to a briquetting machine and press it into a 5 cm briquette, and dry it until the water content is about 8%. Powdered anthracite is mixed in as reducing agent.

[0072] ...

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Abstract

The invention relates to a production line, mechanical equipment and a technique method for preparing high-grade zinc oxide by utilizing cast iron dust. The method for making the high-grade zinc oxide by utilizing the cast iron dust is characterized in that the traditional Webster furnace production line is modified, a cyclone dust collector of a unique structure is combined with a multi-stage cyclone dust collector to substitute part of cooling pipes of a Webster furnace, the cyclone dust collector as well as a fixed exhaust pipe and a movable exhaust pipe divided by an exhaust pipe cause the length of the exhaust pipe to be adjustable, the length of the exhaust pipe is adjusted by virtue of three sets of lead screws and nuts which are uniformly distributed, the lead screws are fixed on the movable exhaust pipe, and the nuts are fixed on the upper surface of the cyclone dust collector; a cooling water jacket is additionally arranged outside, so that separating and settling effects are achieved, and a cooling effect of a cooling pipe is also achieved. According to the method for making the high-grade zinc oxide by utilizing the cast iron dust, the cast iron dust is utilized, the high-grade zinc oxide is prepared according to a production technology process comprising briquetting, reducing, oxidizing, cooling, separating, settling, cooling and dust collecting, the content of zinc oxide is more than 98% and is increased by more than 10% compared with that of the zinc oxide produced by the traditional Webster furnace production line, the whiteness of the zinc oxide is also greatly improved, and the whiteness of the zinc oxide can be 93.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting, and in particular relates to a method for preparing high-grade zinc oxide by using cast iron dedusting ash. Background technique : [0002] The main components of dust removal dust produced in the process of casting iron are zinc, lead, iron, aluminum, magnesium, calcium, silver, indium, bismuth, carbon, chlorine, fluorine, etc. The composition of dust removal dust of cast iron is complex, generally zinc-based, of which Bismuth, silver, indium and other metals are rare and precious metals with high value, and their content in nature is very low, mainly associated with iron ore and zinc ore and other minerals. Dust removal ash was buried as garbage in the early days, but in recent years it has begun to be used as a resource. [0003] A current treatment method is to produce low-grade zinc oxide (commonly known as secondary zinc oxide) through smelting in a rotary kiln. The content of zin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/36C22B7/02B04C5/24
CPCY02P10/20
Inventor 俞金长李天朝
Owner HEZHANG LINGXUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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