CN110093496A - A kind of ferrochrome dust resourcesization containing chromium powder utilize method - Google Patents
A kind of ferrochrome dust resourcesization containing chromium powder utilize method Download PDFInfo
- Publication number
- CN110093496A CN110093496A CN201910389980.1A CN201910389980A CN110093496A CN 110093496 A CN110093496 A CN 110093496A CN 201910389980 A CN201910389980 A CN 201910389980A CN 110093496 A CN110093496 A CN 110093496A
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- CN
- China
- Prior art keywords
- containing chromium
- chromium powder
- resourcesization
- ferrochrome
- utilize method
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G37/00—Compounds of chromium
- C01G37/14—Chromates; Bichromates
-
- 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
- C22B1/02—Roasting processes
-
- 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
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/32—Obtaining chromium
-
- 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
- C22B7/006—Wet processes
-
- 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
- C22B7/02—Working-up flue dust
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a kind of ferrochrome dust resourcesization containing chromium powder to utilize method, belong to dangerous waste process field, purpose is to solve in ferrochrome manufacturing enterprise in steelmaking process, generated dirt containing chromium powder, it is disposed usually as steelmaking ingredient or cement additive, cannot achieve the problem of chromium resourceization utilizes.This method comprises the following steps: ingredient, mixing, calcining, wet-milling, filtration washing.Dirt containing chromium powder is handled using the application, can effective recycling its chromic salts, can not only realize the resource utilization of the dirt containing chromium powder, moreover it is possible to chromium salt production cost can be reduced.Meanwhile the process flow of the application is short, and it is easy to operate, it can satisfy the demand of industrial applications, application value with higher.Using the application, it is able to achieve the resource utilization for chromium, strengthens the recycling of valuable constituent element, for alleviating chromium resource wretched insufficiency, external dependence degree is reduced, reduces the environmental pollution that ferrochrome generates, promote sustainable development, have important practical significance.
Description
Technical field
The present invention relates to dangerous waste process field, especially field of waste recycle, specially a kind of ferrochrome contains chromium powder
Dust resourcesization utilize method.Existing ferrochrome dirt containing chromium powder usually as modes such as steelmaking ingredient or cement additives at
Reason, and the application provides a kind of ferrochrome dust resourcesization containing chromium powder using method, with realization to the resource utilization of chromium.
Background technique
In steelmaking process, a large amount of dust of generation need to be handled through dust-extraction unit, and collect it for ferrochrome manufacturing enterprise
In dust.The dust contains about 15%~30% Cr2O3Cr VI with 0.1%~0.5% belongs to " National Hazard waste
Register 2016 " in HW21 waste containing chromium, waste code: 315-002-21.Ferrochrome dirt containing chromium powder is since granularity is superfine, structure
Complexity, and there is certain toxicity, so that its comprehensive utilization difficulty is big.For such dirt containing chromium powder, traditional method of disposal be by
This contains chromium powder dirt and is disposed as steelmaking ingredient or cement additive.
In recent years, with economic sustainable development, ferrochrome consumption figure and yield increase year by year, the Dust Capacity of generation
Increasingly increase, causes serious environmental pollution and the wasting of resources.The country chromium depleted as one, China, 97% chrome ore are dependent on
In import.And the chromium content in ferrochrome dirt containing chromium powder is higher, resource utilization value is higher, and the amount of the dirt containing chromium powder is increasingly
Increase.
For this purpose, researching and developing a kind of ferrochrome dust resourcesization containing chromium powder using method, just it is particularly important.
Summary of the invention
Goal of the invention of the invention is: generated to contain chromium powder for ferrochrome manufacturing enterprise in steelmaking process
Dirt is disposed usually as steelmaking ingredient or cement additive, be cannot achieve the problem of chromium resourceization utilizes, is provided a kind of iron
Evanohm dust resourcesization containing chromium powder utilize method.Using the application, it is able to achieve the resource utilization for chromium, strengthens valuable constituent element
Recycling, for alleviate chromium resource wretched insufficiency, reduce external dependence degree, reduce ferrochrome generate environmental pollution, promote
Sustainable development has important practical significance.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of ferrochrome dust resourcesization containing chromium powder utilize method, include the following steps:
(1) ingredient
Weigh dirt containing chromium powder, oxidant, filler according to the ratio respectively, it is spare；The matter of oxidant, filler, the dirt containing chromium powder
Amount percentage is 20~25%:20~30%: surplus；
(2) it mixes
The weighed dirt containing chromium powder of step (1), oxidant, filler are mixed, stirred evenly, raw material are obtained；
(3) it calcines
The raw material of step (2) are calcined in high temperature furnace, high temperature furnace exhaust temperature is controlled at 500 DEG C~600 DEG C, is burnt
It controls at band temperature at 1000 DEG C~1200 DEG C, 2~3h of calcination time obtains calcination of chamotte；
The reaction equation of calcining is as follows:
4(Fe·Cr2O3)+8Na2CO3+7O2=8Na2CrO4+2Fe2O3+8CO2↑；
(4) wet-milling
Using wet process by calcination of chamotte grinding to 80~200 mesh；
(5) filtration washing
Under alkaline condition, it using the calcination of chamotte after vacuum multi-stage washing grinding, then is separated by solid-liquid separation, is respectively obtained
Chromium acid sodium solution leaches chromium slag.
In the step 1, the sum of oxidant, mass percent of filler, the dirt containing chromium powder are 100%.
The oxidant is one or both of soda ash, sodium bicarbonate.
The high temperature furnace is rotary kiln.
In the step 5, the concentration of sodium chromate controls total in the leaching chromium slag isolated in 100~300g/L in filtrate
Chromium content is 3%~5%.
In the step 5, the concentration of sodium chromate is controlled in 200g/L in filtrate.
The filler is to mention chromium return slag, for reducing the fused salt amount of material, increases the gas porosity of material, is easy to aoxidize
Reaction.
Total chrome content is lower than 30% in the dirt containing chromium powder.
In conclusion the application provides a kind of ferrochrome dust resourcesization containing chromium powder using method, it can be by ferrochrome
The dirt containing chromium powder generated in production process carries out resource utilization.Dirt containing chromium powder is handled using the application, can effectively recycle benefit
With its chromic salts, the resource utilization of the dirt containing chromium powder can be not only realized, moreover it is possible to chromium salt production cost can be reduced.Meanwhile the application
Process flow is short, easy to operate, can satisfy the demand of industrial applications, application value with higher.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
(1) waste containing chromium that the application can be lower than 30% to total chrome content carries out resource utilization, recycles in dirt containing chromium powder
Chromic salts, chromium recovery ratio is up to 70% or more, application value with higher；
(2) the application can reduce the fused salt amount of material, increase the gas porosity of material, be easy to calcine by adding filler
When oxidation reaction progress；
(3) in the application, it is 80~200 mesh that calcined chamotte powder, which is milled to partial size, convenient for leaching；Increased using wet-milling
The specific surface area of clinker is conducive to the leaching of sodium chromate, improves extraction rate；
(4) the application leaches under alkaline condition, can reduce the leaching of zinc, nickel, improves the utilizing status of sodium chromate；
(5) the application increases the concentration of sodium chromate using multistage washing, is conducive to the application range for expanding sodium chromate；
(6) the chromium acid sodium solution aluminium content that the application obtains is lower, and aluminium content only has the 10% of existing calcium-free roasting method；
(7) total chrome content is 3%~5% in the chromium slag isolated after using the application to handle, and existing calcium-free roasting side
Method is prepared in sodium chromate, and total chrome content is 8%~9% in the chromium slag of generation, shows the application to chromium utilization rate with higher.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is the process flow chart of the application.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.
The dirt containing chromium powder that the embodiment of the present application uses generates for certain processing steel scrap smelting enterprise in refining production process
Cigarette ash, it is as shown in table 1 that this contains chromium powder dirt main component.
1 Dust containing chromium of table
| Component | Content (%) | Component | Content (%) |
| Total chromium (Cr2O3) | 21.06 | Magnesium (MgO) | 8.64 |
| Silicon (SiO2) | 1.59 | Vanadium (V) mg/kg | 291.30 |
| Iron (Fe2O3) | 47.88 | Water-soluble chromium | 0.19 |
| Aluminium (Al2O3) | 0.71 | Basicity | 14.29 |
| Calcium (CaO) | 11.60 | Moisture content | 0.18 |
| Sulfate | 0.23 | Loss on ignition (loss) | -0.79 |
| Nickel (NiO) | 2.11 | Zinc (ZnO) | 5.31 |
Examples 1 to 5
(1) chromium powder dirt, oxidant, filler mixing will be contained, be sufficiently stirred, obtain raw material, dirt containing chromium powder, is filled out oxidant
It fills agent proportion and is shown in Table 2.Wherein, oxidant uses sodium carbonate, and filler is to mention chromium return slag.
(2) raw material prepared are calcined in high temperature furnace, by exhaust temperature control at 550 DEG C, burning zone temperature control
System obtains clinker after 1000 DEG C, calcination time 2h.
(3) calcined clinker is ground to partial size using wet-milling is about 100 mesh.
(4) under alkaline condition, it using the clinker after vacuum multi-stage washing grinding, then is separated by solid-liquid separation, obtains sodium chromate
Solution controls the concentration of sodium chromate in filtrate in 200g/L or so.
2 Examples 1 to 5 raw material proportioning of table and response parameter
The chromium acid sodium solution of preparation is measured, measurement result is as shown in table 3 below.
3 Examples 1 to 5 dirt containing chromium powder of table recycles effect analysis
From table 2, table 3 it can be seen that total chromium recovery ratio is total in chromium slag that treated up to 70% or more in embodiment 3,4,5
Chromium content is 3%~5%.Effect is best when the dosage for illustrating filler in dirt containing chromium powder is 20%~30%.
Embodiment 6~10
(1) chromium powder dirt, oxidant, filler mixing will be contained, be sufficiently stirred, obtain raw material, dirt containing chromium powder, is filled out oxidant
It fills agent proportion and is shown in Table 4.Wherein, oxidant uses sodium bicarbonate, and filler uses and mentions chromium return slag.
(2) raw material prepared are calcined in high temperature furnace, by exhaust temperature control at 550 DEG C, burning zone temperature control
System obtains clinker after 1000 DEG C, calcination time 2h.
(3) calcined clinker is ground to partial size using wet-milling is about 100 mesh.
(4) under alkaline condition, it using the clinker after vacuum multi-stage washing grinding, then is separated by solid-liquid separation, obtains sodium chromate
Solution controls the concentration of sodium chromate in filtrate in 200g/L or so.
4 embodiment of table, 6~10 raw material proportioning and response parameter
5 embodiment of table, 6~10 dirt containing chromium powder recycles effect analysis
From table 4, table 5 it can be seen that the increase added with oxidant, clinker conversion ratio and total chromium recovery ratio increase, in fact
Total chromium recovery ratio is applied in example 8,9,10 up to 70% or more, but as the dosage of oxidant increases, clinker conversion ratio and total chromium
The rate of recovery increases trend and slows down, and illustrates that effect is best when oxidant dosage is 20%~25% in dirt containing chromium powder.
Embodiment 11~15
(1) chromium powder dirt, oxidant, filler mixing will be contained, be sufficiently stirred, obtain raw material, dirt containing chromium powder, is filled out oxidant
It fills agent proportion and is shown in Table 6.Wherein, oxidant uses sodium carbonate, and filler uses and mentions chromium return slag.
(2) raw material prepared are calcined in high temperature furnace, burning zone temperature control is shown in Table 6, after calcination time 2h, obtains
Obtain clinker.
(3) calcined clinker is ground to partial size using wet-milling is about 100 mesh.
(4) under alkaline condition, it using the clinker after vacuum multi-stage washing grinding, then is separated by solid-liquid separation, obtains sodium chromate
Solution controls the concentration of sodium chromate in filtrate in 200g/L or so.
6 embodiment of table, 11~15 raw material proportioning and response parameter
7 embodiment of table, 11~15 dirt containing chromium powder recycles effect analysis
From table 6, table 7 it can be seen that total chromium recovery ratio is up to 70% or more in embodiment 12,13,14, chromium slag that treated
Middle total chrome content is 3%~5%.When reaction temperature reaches 1300 DEG C, clinker conversion ratio increases, but total chromium recovery ratio is at decline
Trend illustrates that effect is best when the processing burning zone temperature of dirt containing chromium powder is 1000 DEG C~1200 DEG C.
It is not only in the description and the implementation listed although embodiment of the present invention has been announced as above
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (8)
1. a kind of ferrochrome dust resourcesization containing chromium powder utilize method, which comprises the steps of:
(1) ingredient
Weigh dirt containing chromium powder, oxidant, filler according to the ratio respectively, it is spare；The quality hundred of oxidant, filler, the dirt containing chromium powder
Divide than being 20 ~ 25%:20 ~ 30%: surplus；
(2) it mixes
The weighed dirt containing chromium powder of step (1), oxidant, filler are mixed, stirred evenly, raw material are obtained；
(3) it calcines
The raw material of step (2) are calcined in high temperature furnace, the control of high temperature furnace exhaust temperature is at 500 DEG C ~ 600 DEG C, clinkering zone
Temperature is controlled at 1000 DEG C ~ 1200 DEG C, and 2 ~ 3h of calcination time obtains calcination of chamotte；
(4) wet-milling
Using wet process by calcination of chamotte grinding to 80 ~ 200 mesh；
(5) filtration washing
Under alkaline condition, it using the calcination of chamotte after vacuum multi-stage washing grinding, then is separated by solid-liquid separation, respectively obtains chromic acid
Sodium solution leaches chromium slag.
2. ferrochrome dust resourcesization containing chromium powder according to claim 1 utilize method, which is characterized in that the step 1
In, the sum of oxidant, mass percent of filler, the dirt containing chromium powder are 100%.
3. ferrochrome dust resourcesization containing chromium powder according to claim 1 utilize method, which is characterized in that the oxidant
For one or both of soda ash, sodium bicarbonate.
4. ferrochrome dust resourcesization containing chromium powder according to claim 1 utilize method, which is characterized in that the high temperature furnace
For rotary kiln.
5. described in any item ferrochrome dust resourcesization containing chromium powder utilize method according to claim 1 ~ 4, which is characterized in that institute
State in step 5, the concentration of sodium chromate is controlled in 100 ~ 300g/L in filtrate, in the leaching chromium slag isolated total chrome content be 3% ~
5%。
6. described in any item ferrochrome dust resourcesization containing chromium powder utilize method according to claim 1 ~ 5, which is characterized in that institute
It states in step 5, the concentration of sodium chromate is controlled in 200g/L in filtrate.
7. ferrochrome dust resourcesization containing chromium powder according to claim 6 utilize method, which is characterized in that the filler
To mention chromium return slag.
8. described in any item ferrochrome dust resourcesization containing chromium powder utilize method according to claim 1 ~ 7, which is characterized in that institute
It states total chrome content in dirt containing chromium powder and is lower than 30%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111876607A (en) * | 2020-07-07 | 2020-11-03 | 江苏科技大学 | Leaching, enriching and separating process for iron and chromium elements in electric furnace dust |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1527168A1 (en) * | 1986-12-10 | 1989-12-07 | Mazaletskij Gurij D | Method of producing sodium chromate |
| CN1226512A (en) * | 1998-02-20 | 1999-08-25 | 中国科学院化工冶金研究所 | Clean production of sodium chlomate |
| CN101045559A (en) * | 2007-04-19 | 2007-10-03 | 甘肃锦世化工有限责任公司 | Method for producing sodium chromate non-calcium calcined by ferrochrome mine |
| CN102173455A (en) * | 2011-01-17 | 2011-09-07 | 湖南农业大学 | Method for producing chromium-containing product by using chromium-containing waste residue |
| CN102275992A (en) * | 2011-05-31 | 2011-12-14 | 重庆民丰化工有限责任公司 | Two-stage roasting method for chromite |
| CN102285688A (en) * | 2011-06-14 | 2011-12-21 | 青海省中星化工有限公司 | Roasting oxidation comprehensive detoxification clean process of chromium slag |
-
2019
- 2019-05-10 CN CN201910389980.1A patent/CN110093496A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1527168A1 (en) * | 1986-12-10 | 1989-12-07 | Mazaletskij Gurij D | Method of producing sodium chromate |
| CN1226512A (en) * | 1998-02-20 | 1999-08-25 | 中国科学院化工冶金研究所 | Clean production of sodium chlomate |
| CN101045559A (en) * | 2007-04-19 | 2007-10-03 | 甘肃锦世化工有限责任公司 | Method for producing sodium chromate non-calcium calcined by ferrochrome mine |
| CN102173455A (en) * | 2011-01-17 | 2011-09-07 | 湖南农业大学 | Method for producing chromium-containing product by using chromium-containing waste residue |
| CN102275992A (en) * | 2011-05-31 | 2011-12-14 | 重庆民丰化工有限责任公司 | Two-stage roasting method for chromite |
| CN102285688A (en) * | 2011-06-14 | 2011-12-21 | 青海省中星化工有限公司 | Roasting oxidation comprehensive detoxification clean process of chromium slag |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111876607A (en) * | 2020-07-07 | 2020-11-03 | 江苏科技大学 | Leaching, enriching and separating process for iron and chromium elements in electric furnace dust |
| CN111876607B (en) * | 2020-07-07 | 2022-02-11 | 江苏科技大学 | Leaching, enriching and separating process for iron and chromium elements in electric furnace dust |
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Application publication date: 20190806 |