CN111809055A - High-temperature high-speed carbonization recycling process of tin mud - Google Patents
High-temperature high-speed carbonization recycling process of tin mud Download PDFInfo
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- CN111809055A CN111809055A CN202010704121.XA CN202010704121A CN111809055A CN 111809055 A CN111809055 A CN 111809055A CN 202010704121 A CN202010704121 A CN 202010704121A CN 111809055 A CN111809055 A CN 111809055A
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- tin
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- carbonization
- mud
- tin mud
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B25/00—Obtaining tin
- C22B25/02—Obtaining tin by dry processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B25/00—Obtaining tin
- C22B25/06—Obtaining tin from scrap, especially tin scrap
Abstract
The invention provides a high-temperature high-speed carbonization recycling process of tin mud, and relates to the technical field of tin mud recycling. The high-temperature high-speed carbonization recycling process of tin mud comprises the following process steps: step 1, collecting tin mud generated in the production process of a tin-plated product, and performing filter pressing treatment until the water content in the tin mud is 30-50%; and 2, feeding the collected preliminarily filter-pressed tin mud into a granulating and low-temperature drying device, extruding the tin mud into a column shape by a granulating and extruding machine, and uniformly distributing the column shape into the low-temperature drying device, wherein the low-temperature drying device evaporates water by utilizing hot air. The process completely decomposes benzenesulfonic acid and other organic additives in the tin mud in an oxygen-free high-temperature state, evaporates water, finally obtains a mixture mainly containing tin and solid carbon, and obtains pure tin through separation.
Description
Technical Field
The invention relates to the technical field of recycling of tin element in tin mud, in particular to a high-temperature high-speed carbonization recycling process of tin mud.
Background
The tin mud is a waste generated by the production process in the production of tin-plated products in steel plants, belongs to industrial hazardous waste (coded as HW17), mainly comprises water, tin, benzenesulfonic acid and organic additives, wherein the content of tin is generally more than 20%, and has high recovery value.
In the traditional treatment process, generally, after moisture, benzenesulfonic acid and an organic additive are evaporated and combusted through firing process treatment, tin is recovered, secondary pollution is caused in the incineration process, and meanwhile, a large amount of tin is oxidized to cause resource waste.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a high-temperature high-speed carbonization recycling process of tin mud, which solves the problems that secondary pollution is caused in the incineration process, and a large amount of tin is oxidized to cause resource waste.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a high-temperature high-speed carbonization recycling process of tin mud comprises the following process steps:
step 1, collecting tin mud generated in the production process of a tin-plated product, and performing filter pressing treatment until the water content in the tin mud is 30-50%;
step 2, feeding the collected preliminarily filter-pressed tin mud into a granulating and low-temperature drying device, extruding the tin mud into a column shape by the granulator, uniformly distributing the column shape into the low-temperature drying device, and evaporating water by the low-temperature drying device by using hot air until the water content in the tin mud reaches 10-20%;
3, conveying the dried and dehydrated tin mud into a storage and uniform feeding system, quantitatively conveying the tin mud to a high-temperature high-speed carbonization device, and carrying out high-temperature carbonization treatment for isolating oxygen;
step 4, introducing gaseous substances generated by high-temperature carbonization treatment into a gas combustion chamber of the high-temperature carbonization treatment device or system through a pipeline for complete combustion;
and 5, discharging the mixture of solid and liquid generated by the high-temperature carbonization treatment out of the device, performing solid-liquid separation, and recovering the tin particles to finally form the product.
Preferably, before the feeding treatment, the high-temperature and high-speed carbonizing device in step 3 is cleaned by inert gas to avoid oxygen residue, and the inert gas is injected into the feeding hole to form a gas curtain to isolate air from entering.
Preferably, the inert gas is nitrogen, and other inert or reducing gases can be selected; an oxygen content detector is arranged in a carbonization pipeline of the high-temperature and high-speed carbonization device, and the oxygen content is controlled to be not higher than 0.5%.
Preferably, the high-temperature high-speed carbonizing device in the step 3 is provided with a tail gas treatment system, and the tail gas treatment system comprises cooling, desulfurization, denitration, dust removal and activated carbon adsorption.
Preferably, in the step 5, the mixture generated by the high-temperature carbonization treatment is firstly put into an electric heating crucible to be melted, the molten tin at the bottom is dripped into a water bath by utilizing different densities to form tin particles, and the carbon slag on the upper layer of the crucible is separated and recovered.
Preferably, the temperature of the high-temperature high-speed carbonization in the step 3 is 300-800 ℃.
(III) advantageous effects
The invention provides a high-temperature high-speed carbonization recycling process of tin mud. The method has the following beneficial effects:
1. according to the invention, benzenesulfonic acid and other organic additives in the tin mud are completely decomposed in an oxygen-free high-temperature state, water is evaporated, and finally a mixture mainly containing tin and solid carbon is obtained, and then pure tin is obtained through separation.
2. The invention can reduce the energy consumption in the treatment process by introducing the gaseous substances generated in the treatment process into the high-temperature high-speed carbonization device to perform combustion heat supply.
(IV) description of the drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a high-temperature high-speed carbonization recycling process of tin mud, which comprises the following process steps:
step 1, collecting tin mud generated in the production process of a tin-plated product, and performing filter pressing treatment until the water content in the tin mud is 40%;
step 2, feeding the collected preliminarily filter-pressed tin mud into a granulating and low-temperature drying device, extruding the tin mud into a column shape by the granulating machine, uniformly distributing the column shape into the low-temperature drying device, and evaporating water by the low-temperature drying device by using hot air until the water content in the tin mud reaches 15%;
3, conveying the dried and dehydrated tin mud into a storage and uniform feeding system, quantitatively conveying the tin mud to a high-temperature high-speed carbonization device, and carrying out high-temperature carbonization treatment for isolating oxygen;
step 4, introducing gaseous substances generated by high-temperature carbonization treatment into a gas combustion chamber of the high-temperature carbonization treatment device or system through a pipeline for complete combustion;
and 5, firstly, putting the mixture generated by the high-temperature carbonization treatment into an electric heating crucible for melting, dripping the bottom tin melt into a water bath by utilizing different densities to form tin particles, and realizing separation and recovery of carbon slag on the upper layer of the crucible to finally form a product.
Before the feeding treatment of the high-temperature high-speed carbonization device in the step 3, the furnace is cleaned by inert gas to avoid oxygen residue, and the inert gas is nitrogen; an oxygen content detector is arranged in a carbonization pipeline of the high-temperature high-speed carbonization device, the oxygen content is controlled to be 0.4%, the high-temperature high-speed carbonization device in the step 3 is provided with a tail gas treatment system, the tail gas treatment system comprises cooling, desulfurization, denitration, dust removal and activated carbon adsorption, a mixture generated in the high-temperature carbonization treatment in the step 5 firstly enters an electric heating crucible for melting, tin melt at the bottom is dripped into a water bath to form tin particles by utilizing different densities, and carbon slag on the upper layer of the crucible is separated and recovered, and the high-temperature high-speed carbonization temperature in the step 3 is 300-800 ℃.
In the high-temperature high-speed carbonization device, benzene sulfonic acid and organic additives of the tin mud have the following chemical reactions:
phenolsulfonic acid C6H6O4S → 2C + CH4+ H2O +3CO + S
Organic additive ENSA C22H32O10S → 7C +7CH4+2H2O +8CO + S
Organic additive EN C30H48O11 → 10C +11CH4+2H2O +9CO
The sulfur reacts with high-temperature steam at a high temperature to generate hydrogen sulfide and sulfur dioxide, finally the hydrogen sulfide and the sulfur dioxide enter tail gas in a gaseous state, and part of carbon reacts with the high-temperature steam to generate hydrogen and carbon monoxide, so that the tin-mud mixture mainly generates solid substances (mainly comprising carbon and other inorganic components), liquid substances (mainly comprising liquid tin) and gaseous substances (mainly comprising methane, hydrogen, carbon monoxide, hydrogen sulfide, sulfur dioxide and the like) in the carbonization reaction process.
Pure tin (the purity of tin reaches more than 98%) can be obtained through the high-temperature high-speed carbonization recycling process of the tin mud, and the recovery rate of tin can be greatly improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A high-temperature high-speed carbonization recycling process of tin mud is characterized in that: the method comprises the following process steps:
step 1, collecting tin mud generated in the production process of a tin-plated product, and performing filter pressing treatment until the water content in the tin mud is 30-50%;
step 2, feeding the collected preliminarily filter-pressed tin mud into a granulating and low-temperature drying device, extruding the tin mud into a column shape by a granulating and extruding machine, uniformly distributing the column shape into the low-temperature drying device, and evaporating water by the low-temperature drying device by using hot air to enable the water content in the tin mud to be 10-20%;
3, conveying the dried and dehydrated tin mud into a storage and uniform feeding system, quantitatively conveying the tin mud to a high-temperature high-speed carbonization device, and carrying out high-temperature carbonization treatment for isolating oxygen;
step 4, introducing gaseous substances generated by high-temperature carbonization treatment into a gas combustion chamber of the high-temperature carbonization treatment device or system through a pipeline for complete combustion;
and 5, discharging the solid and liquid mixture generated by the high-temperature carbonization treatment out of the device, separating tin from carbon slag, and recovering tin particles to finally form a product.
2. The high-temperature high-speed carbonization recycling process of tin sludge according to claim 1, characterized in that: before the feeding treatment of the high-temperature high-speed carbonization device in the step 3, the furnace is cleaned by inert gas to avoid oxygen residue and oxidize tin.
3. The high-temperature high-speed carbonization recycling process of tin sludge according to claim 1, characterized in that: the inert gas is nitrogen; an oxygen content detector is arranged in a carbonization pipeline of the high-temperature and high-speed carbonization device, and the oxygen content is controlled to be not higher than 0.5%.
4. The high-temperature high-speed carbonization recycling process of tin sludge according to claim 1, characterized in that: and 3, arranging a tail gas treatment system in the high-temperature high-speed carbonization device, wherein the tail gas treatment system comprises cooling, desulfurization, denitration, dust removal and activated carbon adsorption.
5. The high-temperature high-speed carbonization recycling process of tin sludge according to claim 1, characterized in that: and (5) separating tin from carbon slag by different melting points of the mixture in the step (5), and recovering tin particles by water cooling.
6. The high-temperature high-speed carbonization recycling process of tin sludge according to claim 1, characterized in that: the temperature of the high-temperature high-speed carbonization in the step 3 is 300-800 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010704121.XA CN111809055A (en) | 2020-07-21 | 2020-07-21 | High-temperature high-speed carbonization recycling process of tin mud |
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| CN202010704121.XA CN111809055A (en) | 2020-07-21 | 2020-07-21 | High-temperature high-speed carbonization recycling process of tin mud |
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| CN111809055A true CN111809055A (en) | 2020-10-23 |
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| CN202010704121.XA Pending CN111809055A (en) | 2020-07-21 | 2020-07-21 | High-temperature high-speed carbonization recycling process of tin mud |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109956625A (en) * | 2019-03-30 | 2019-07-02 | 山东美陵中联环境工程有限公司 | Municipal sludge high temperature carbonization prepares the process of charcoal |
| CN210176701U (en) * | 2019-06-06 | 2020-03-24 | 中铁环境科技工程有限公司 | System for municipal sludge deep reduction treatment |
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2020
- 2020-07-21 CN CN202010704121.XA patent/CN111809055A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109956625A (en) * | 2019-03-30 | 2019-07-02 | 山东美陵中联环境工程有限公司 | Municipal sludge high temperature carbonization prepares the process of charcoal |
| CN210176701U (en) * | 2019-06-06 | 2020-03-24 | 中铁环境科技工程有限公司 | System for municipal sludge deep reduction treatment |
Non-Patent Citations (1)
| Title |
|---|
| 姬爱民 等: "《污泥热处理》", 31 August 2014 * |
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