CN102039420A - Method for preparing superfine zinc powder from hot galvanizing zinc slag wastes through vacuum evaporation and rapid condensation - Google Patents
Method for preparing superfine zinc powder from hot galvanizing zinc slag wastes through vacuum evaporation and rapid condensation Download PDFInfo
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- CN102039420A CN102039420A CN2010105327825A CN201010532782A CN102039420A CN 102039420 A CN102039420 A CN 102039420A CN 2010105327825 A CN2010105327825 A CN 2010105327825A CN 201010532782 A CN201010532782 A CN 201010532782A CN 102039420 A CN102039420 A CN 102039420A
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Abstract
The invention discloses a method for preparing superfine zinc powder from hot galvanizing zinc slag wastes through vacuum evaporation and rapid condensation. In the method, the processing raw materials are mainly specific to metal zinc-containing solid wastes generated in a hot galvanizing industrial process, the wastes generally contain zinc with higher grade, and the method is used for carrying out vacuum evaporation and rapid condensation on the wastes to prepare the superfine zinc powder directly so as to achieve the purposes of zinc resource recovery and deep utilization of the solid wastes. The method can be used for helping hot galvanizing manufacturers effectively process the hot galvanizing slag continuously generated in the hot galvanizing process so as to fully recover the secondary zinc resources and realize the comprehensive recovery and deep utilization of the zinc resources. The method has the characteristics of simple and feasible process, short process flow, low demand on investment, high efficiency, no pollution and the like, can be used for bringing better economic benefits for the hot galvanizing manufactures, and also has better environmental and social comprehensive benefits.
Description
Technical field
The comprehensive recovery with the degree of depth of secondary zinc resource that the present invention relates to a kind of containing metal zinc industrial solid castoff utilized method, be particularly related to the method that a kind of hot galvanizing residue class discarded object vacuum evaporation rapid condensation prepares super-fine zinc dust, belong to non-ferrous metal secondary resource recovery technology field and vacuum metallurgy technology field.
Background technology
The galvanizing technology is widely used in the antirust of ferrous materials, and China is a big steel country, and along with the accelerated development of basic industries such as building, boats and ships, bridge, the demand of galvanizing product enlarges day by day, and the galvanizing industry in China's development rapidly.In the production process of galvanizing product, want the very high hot galvanizing residue solid waste of output containing metal zinc inevitably; this class discarded object is carried out the utilization of the resource degree of depth effectively; to economize on resources, protect the society and the ecological benefits of aspects such as environment simultaneously in addition for the galvanizing production unit brings certain economic benefits.
General recovery method for hot galvanizing residue class solid waste mainly comprises: electric furnace smelting process, the metallic zinc method is put forward in vacuum distillation, wet-chemical treatment prepares zinc oxide method, above-mentioned pyrogenic process method requires bigger production capacity and bigger equipment input usually, in the wet-chemical treatment process because of using various chemicals to have higher environmental risk and potential safety hazard, and the product that all these methods are produced all is metal zinc ingot or zinc oxide product, for galvanizing manufacturer, the resource degree of depth of using these class methods to carry out hot galvanizing residue utilizes economic benefit all not too high, and these method galvanizing producers are generally all not very willing to adopt.
Summary of the invention
The objective of the invention is to utilize the higher hot galvanizing residue waste material of containing metal zinc of output in the galvanizing production process for the resource degree of depth, solve and generally to contain the zinc method for treatment of waste material and do not fit into the problem that galvanizing manufacturer adopts, provide a kind of be adapted to clean and effective that galvanizing manufacturer uses and flexibly the hot galvanizing residue resource degree of depth utilize method.
The method that a kind of hot galvanizing residue class discarded object vacuum evaporation rapid condensation provided by the invention prepares super-fine zinc dust may further comprise the steps:
(1) the hot galvanizing residue class solid waste of containing metal zinc is carried out the melting pre-treatment, the metal in the waste material is separated with oxidizing slag;
(2) the metallic zinc alloy of gained in the step (1) is packed in the heat-resisting evaporimeter;
(3) the heat-resisting evaporimeter that will fill the metallic zinc alloy is sent into the vacuum evaporation stove, implements vacuum distillation, finishes up to distillation, then cooling naturally;
(4) vacuum distillation gained metallic zinc steam in the step (3) is inducted into cooling fast in the condenser, the metallic zinc steam is condensed into zinc powder and is deposited on around the condenser wall;
(5) air current classifying is carried out in the zinc powder primary product taking-up of step (4) gained, obtain the super-fine zinc dust product of small part coarse granule and most of various grades;
(6) a small amount of residue that step (3) evaporation is finished also to cool off naturally in the stove of back takes out.
The melting pre-processing device is common electric furnace in the above-mentioned steps (1), and the waste disposal temperature is 550 ℃.
Heat-resisting evaporimeter is a graphite crucible in the above-mentioned steps (2).
Vacuum evaporation stove in the above-mentioned steps (3) adopts the metallic heating body heating, and pumping equipment is selected rotary-vane vaccum pump for use, and vapo(u)rizing temperature is controlled at 900 ℃～1000 ℃, finishes up to distillation, naturally cools to 200 ℃ then.
Metallic zinc steam guiding in the above-mentioned steps (4) and sealing device are by the heat-resistance stainless steel manufacturing, condenser is made by common 304L stainless steel, condenser can add water collar forces cooling, also can not add water collar and cool off naturally, but require to have enough big cooling space and cooling wall area by air.
Require furnace temperature to naturally cool to 200 ℃ before taking out the zinc powder primary product in the above-mentioned steps (5), slowly blowing air or nitrogen destroy vacuum then, the zinc powder that takes out carries out classification by gas flow sizing machine, the following coarse granule metal zinc of 200 orders accounts for 10%, 80% product granularity of primary product more than 500 orders.
The natural chilling temperature of vacuum evaporation stove was 200 ℃ when above-mentioned steps (6) was taken out residue.
Beneficial effect of the present invention:
The hot galvanizing residue class containing metal zinc solid waste resource recovery degree of depth provided by the invention is utilized method to be specially adapted to galvanizing manufacturer and is selected for use, have significant advantage with respect to general hot galvanizing residue waste material recovery method: flow process is short, pollution-free, invest little, profitable.The deep processed product super-fine zinc dust quality height that obtains in the recycling process, can be used for further producing zinc-rich paint or be used as reducing agent etc., can produce favorable economic benefit, significantly reduce the waste sludge discharge amount in the galvanizing production process simultaneously, have higher environment and social benefit.
Description of drawings
Fig. 1 is a concrete process flow diagram of the present invention.
The specific embodiment
Embodiment 1
1. take by weighing 5 kilograms of hot galvanizing residue melting pre-treatments, the melting pre-processing device is common electric furnace, and the waste disposal temperature is 550 ℃.
2. handle by electro-smelting and obtain 4 kilograms of crude zinc alloys.
3. the graphite crucible of the crude zinc alloy being packed into.
4. the graphite crucible after will feeding moves in the vacuum evaporation stove, covers the vacuum bell, and the vacuum evaporation stove adopts the metallic heating body heating, and pumping equipment is selected rotary-vane vaccum pump for use.
5. heat up and vacuumize, be warming up to 950 ℃ through about one and a half hours.
6. evaporation at constant temperature, one hour evaporation at constant temperature time, vacustat is in the scope of 50Pa～100Pa in the evaporation process.
7. zinc evaporation is directed into condenser condenses and becomes super-fine zinc dust in the evaporation process, and the condenser wall temperature becomes in the powder process and can rise to some extent at whole evaporative condenser, and after evaporative condenser finished, the condenser wall temperature can be reduced to normal temperature.
8. after evaporation finished, the vacuum evaporation stove naturally cooled to 200 ℃, slowly filled air and destroyed vacuum to normal pressure, opened bell, took out graphite crucible, took out about 500 grams of residue, and the cleaning condenser, took out 3 kilograms of zinc powders, had part to be deposited on the condenser wall.
Embodiment 2
1. take by weighing 10 kilograms of hot galvanizing residue melting pre-treatments, the melting pre-processing device is common electric furnace, and the waste disposal temperature is 550 ℃.
2. handle by electro-smelting and obtain 8.2 kilograms of crude zinc alloys.
3. the graphite crucible of the crude zinc alloy being packed into.
4. the graphite crucible after will feeding moves in the vacuum evaporation stove, covers the vacuum bell, and the vacuum evaporation stove adopts the metallic heating body heating, and pumping equipment is selected rotary-vane vaccum pump for use.
5. heat up and vacuumize, be warming up to 1000 ℃ through about one and a half hours.
6. evaporation at constant temperature, one hour evaporation at constant temperature time, vacustat is in the scope of 50Pa～100Pa in the evaporation process.
7. zinc evaporation is directed into condenser condenses and becomes super-fine zinc dust in the evaporation process, and the condenser wall temperature becomes in the powder process and can rise to some extent at whole evaporative condenser, and after evaporative condenser finished, the condenser wall temperature can be reduced to normal temperature.
8. after evaporation finished, the vacuum evaporation stove naturally cooled to 200 ℃, slowly filled air and destroyed vacuum to normal pressure, opened bell, took out graphite crucible, took out about 1000 grams of residue, and the cleaning condenser, took out 6.5 kilograms of zinc powders, had part to be deposited on the condenser wall.
Claims (7)
1. a hot galvanizing residue class discarded object vacuum evaporation rapid condensation prepares the method for super-fine zinc dust, it is characterized in that may further comprise the steps:
(1) the hot galvanizing residue class solid waste of containing metal zinc is carried out the melting pre-treatment, the metal in the waste material is separated with oxidizing slag;
(2) the metallic zinc alloy of gained in the step (1) is packed in the heat-resisting evaporimeter;
(3) the heat-resisting evaporimeter that will fill the metallic zinc alloy is sent into the vacuum evaporation stove, implements vacuum distillation, finishes up to distillation, then cooling naturally;
(4) vacuum distillation gained metallic zinc steam in the step (3) is inducted into cooling fast in the condenser, the metallic zinc steam is condensed into zinc powder and is deposited on around the condenser wall;
(5) air current classifying is carried out in the zinc powder primary product taking-up of step (4) gained, obtain the super-fine zinc dust product of small part coarse granule and most of various grades;
(6) a small amount of residue that step (3) evaporation is finished also to cool off naturally in the stove of back takes out.
2. method according to claim 1 is characterized in that: the melting pre-processing device is common electric furnace in the above-mentioned steps (1), and the waste disposal temperature is 550 ℃.
3. method according to claim 1 is characterized in that: heat-resisting evaporimeter is a graphite crucible in the above-mentioned steps (2).
4. method according to claim 1, it is characterized in that: the vacuum evaporation stove in the above-mentioned steps (3) adopts the metallic heating body heating, and pumping equipment is selected rotary-vane vaccum pump for use, and vapo(u)rizing temperature is controlled at 900 ℃～1000 ℃, finish up to distillation, naturally cool to 200 ℃ then.
5. method according to claim 1, it is characterized in that: metallic zinc steam guiding in the above-mentioned steps (4) and sealing device are by the heat-resistance stainless steel manufacturing, condenser is made by common 304L stainless steel, condenser can add water collar forces cooling, also can not add water collar and cool off naturally, but require to have enough big cooling space and cooling wall area by air.
6. method according to claim 1 is characterized in that: require furnace temperature to naturally cool to 200 ℃ before taking out the zinc powder primary product in the above-mentioned steps (5), slowly blowing air or nitrogen destroy vacuum then, and the zinc powder of taking-up carries out classification by gas flow sizing machine.
7. method according to claim 1 is characterized in that: the natural chilling temperature of vacuum evaporation stove was 200 ℃ when above-mentioned steps (6) was taken out residue.
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| CN2010105327825A CN102039420A (en) | 2010-11-02 | 2010-11-02 | Method for preparing superfine zinc powder from hot galvanizing zinc slag wastes through vacuum evaporation and rapid condensation |
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| CN2010105327825A CN102039420A (en) | 2010-11-02 | 2010-11-02 | Method for preparing superfine zinc powder from hot galvanizing zinc slag wastes through vacuum evaporation and rapid condensation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104972108A (en) * | 2015-07-07 | 2015-10-14 | 江苏冶建锌业有限公司 | Ultrafine zinc alloy powder and preparation method thereof |
| CN105087958A (en) * | 2015-08-10 | 2015-11-25 | 长沙金马冶金设备有限公司 | Method for recycling zinc from galvanized residues |
| CN105728740A (en) * | 2014-12-08 | 2016-07-06 | 云南云铜锌业股份有限公司 | Zinc dust distillation method |
| CN110760204A (en) * | 2019-10-25 | 2020-02-07 | 珠海格力绿色再生资源有限公司 | System and method for reducing soot ash content of waste tire cracking carbon and recovering Zn |
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| CN1323909A (en) * | 2000-05-11 | 2001-11-28 | 中南工业大学 | Method of extracting zinc from zine slag |
| CN1994630A (en) * | 2005-12-28 | 2007-07-11 | 北京北矿锌业有限责任公司 | Production equipment of high-purity superfine active zinc powder and method for preparing same |
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- 2010-11-02 CN CN2010105327825A patent/CN102039420A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323909A (en) * | 2000-05-11 | 2001-11-28 | 中南工业大学 | Method of extracting zinc from zine slag |
| CN1994630A (en) * | 2005-12-28 | 2007-07-11 | 北京北矿锌业有限责任公司 | Production equipment of high-purity superfine active zinc powder and method for preparing same |
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| 《云南冶金》 19971231 钟胜，戴永年 真空蒸发--冷凝制取超细金属粉末的研究与应用动态 第42-45、9页。 1-7 第26卷, 第6期 * |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105728740A (en) * | 2014-12-08 | 2016-07-06 | 云南云铜锌业股份有限公司 | Zinc dust distillation method |
| CN105728740B (en) * | 2014-12-08 | 2018-01-23 | 云南云铜锌业股份有限公司 | A kind of method for distilling zinc powder |
| CN104972108A (en) * | 2015-07-07 | 2015-10-14 | 江苏冶建锌业有限公司 | Ultrafine zinc alloy powder and preparation method thereof |
| CN105087958A (en) * | 2015-08-10 | 2015-11-25 | 长沙金马冶金设备有限公司 | Method for recycling zinc from galvanized residues |
| CN105087958B (en) * | 2015-08-10 | 2018-03-13 | 长沙金马冶金设备有限公司 | A kind of method that zinc is reclaimed in the cadmia from plating |
| CN110760204A (en) * | 2019-10-25 | 2020-02-07 | 珠海格力绿色再生资源有限公司 | System and method for reducing soot ash content of waste tire cracking carbon and recovering Zn |
| CN110760204B (en) * | 2019-10-25 | 2021-05-11 | 珠海格力绿色再生资源有限公司 | System and method for reducing soot ash content of waste tire cracking carbon and recovering Zn |
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Application publication date: 20110504 |