CN106282549B - A kind of chlorination pelletizing and preparation method thereof - Google Patents
A kind of chlorination pelletizing and preparation method thereof Download PDFInfo
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- CN106282549B CN106282549B CN201610817308.4A CN201610817308A CN106282549B CN 106282549 B CN106282549 B CN 106282549B CN 201610817308 A CN201610817308 A CN 201610817308A CN 106282549 B CN106282549 B CN 106282549B
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- chlorination
- pelletizing
- chlorinating agent
- sulfate slag
- chloride
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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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B1/02—Roasting processes
- C22B1/08—Chloridising roasting
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- 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 present invention provides a kind of chlorination pelletizings and preparation method thereof, by building efficient chlorinated structures pelletizing, HCl gases can be quickly generated under far below medium temperature chlorination temperature (about 800 DEG C), the extra HCl gases for having neither part nor lot in chlorination non-ferrous metal can be chlorinated gas absorbent and quickly absorb again in chlorination process, ensure that HCl is sufficient concentrations of in pelletizing while can prevent a large amount of wastes of chlorinating agent again.At high temperature in chlorination process, HCl that chloridating gas absorbent absorbs can be released again continues chlorination non-ferrous metal, can make up under high temperature chlorinating agent because rate of volatilization soon caused by chlorination atmosphere is inadequate in pelletizing the shortcomings that.The consumption of chlorinating agent can be so substantially reduced, improves the chlorination rate of non-ferrous metal and chlorination rate.
Description
Technical field
The present invention relates to steel sintering raw material fields, and in particular to a kind of chlorination pelletizing and preparation method thereof.
Background technology
As a kind of important secondary resource, sulfate slag contains a small amount of copper, lead, zinc not only containing abundant iron
Wait non-ferrous metals.The Iron grade of sulfate slag is generally 30%~63%, is significantly higher than the iron ore average grade in China 33%, contains
The non-ferrous metals such as some copper, lead, zinc also have considerable recovery value.According to statistics, the sulphur of China's about 15,000,000 tons of discharge every year
Acid sludge, the sulfate slag of stockpiling are more up to more than one hundred million tons, this part of sulfuric acid slag not only pollutes environment, occupies cultivated land, but also it contains
Non-ferrous metal also bring harm to human body.As the by-product after pyrite-based sulfuric acid production, the Iron grade of sulfate slag is relatively low,
The non-ferrous metals content such as copper, lead, zinc is higher, the embedding cloth relation and complicated occurrence state of mineral.These features cause sulfate slag to pass through
After traditional technique of preparing processing, it can not be effectively separated between non-ferrous metal and iron mineral, which has limited sulfate slags to make
Application in standby blast furnace burden.Therefore, as can efficiently separating and removing the non-ferrous metal in sulfate slag, sulfate slag can just be used as one
The good iron-smelting raw material of kind, can be with large-scale application in steel industry, and it is short that this can both alleviate China's steel and iron industry iron ore deposit
Scarce pressure can also solve the problem of environmental pollution of sulfate slag, can also recycle a considerable number of non-ferrous metal.
The removing of non-ferrous metal mainly includes following two methods in sulfate slag both at home and abroad at present.Traditional medium temperature chlorination roasting
It burns and chloridizing roast in medium tempera-ture is carried out at a temperature of 800 DEG C or so using after the chlorinating agents such as NaCl and sulfate slag mixing.Roasting process
The solid chlorinating agents such as middle NaCl are changed into HCl or Cl2Gas, HCl or Cl2Gas and non-ferrous metal reaction generation non-ferrous metal chlorine
Compound, and iron mineral is not chlorinated.Sulfate slag may separate out non-ferrous metal chlorine therein using wet-treating after chloridising roasting
Compound.
Traditional high temperature chlorination roasting is CaCl2Chlorinating agents and sulfate slag is waited to be prepared by mixing into pelletizing, chlorinating agent is uniform
Be distributed in sulfate slag pelletizing.Sulfate slag pelletizing carries out high-temp chlorination roasting after drying at a temperature of 1000 DEG C or so
It burns, solid chlorinating agent is changed into HCl or Cl under high temperature2Gas, non-ferrous metal and HCl or Cl2Gas reaction generates non-ferrous metal chlorine
Compound, chloride are volatized into gas phase at high temperature, and ferriferous oxide cannot be chlorinated in oxidizing atmosphere and stay in ball
In group.Non-ferrous metal and iron mineral in sulfate slag pelletizing is separated with this.Traditional chloridizing roast in medium tempera-ture, solid chlorinating agent are equal
Even is distributed in sulfate slag, and during medium temperature roast (about 800 DEG C), solid chlorinating agent is converted into HCl and Cl2The efficiency of gas
It is low, and under lower temperature non-ferrous metal chlorination rate it is relatively low, the HCl and Cl that a large amount of solid chlorinating agents are transformed2Gas
It is just volatized into because failing participation chlorination in gas phase, this causes, and the consumption of chlorinating agent is big, the chloridising roasting time is long, after chlorination
Product, which is appointed, so to be needed by wet-treating, and the treating capacity of wet-treating is big, and iron mineral can not be recycled；
In traditional high temperature chlorination roasting, chlorinating agent is evenly distributed in sulfate slag pelletizing.This causes one side solid
Chlorinating agent is in a liquid state in high temperature chlorination roasting, and the chlorinating agent of liquid greatly can evaporate into gas phase so as to be greatly reduced
The chlorination efficiency of chlorinating agent；On the other hand the most of HCl and Cl of generation2Gas fails to participate in chlorination reaction in time and diffuse into
Enter gas phase so that the high concentration chlorination atmosphere of enough time is cannot keep in pelletizing, so conventional high-temperature chlorination removes sulphur
The time of chlorinating of non-ferrous metal is long in acid sludge, and the consumption of chlorinating agent is big.
Based on above-mentioned analysis, no matter traditional chloridizing roast in medium tempera-ture or high temperature chlorination roasting, have in sulfate slag is removed
There is apparent deficiency in non-ferrous metal.
The content of the invention
In view of this, it is an object of the invention to provide a kind of chlorination efficiencies that can improve non-ferrous metal and reduction chlorinating agent
Consumption efficient chlorinated structures pelletizing and its chlorination.
In order to solve the above technical problem, the present invention provides concrete scheme it is as follows：A kind of chlorination pelletizing, including core and
It is coated on the housing of the core outer surface；The core count in parts by weight including：
100 parts of sulfate slag；
0~3 part of bentonite；
0~20 part of chloridating gas absorbent；
First 0~8 part of chlorinating agent；
1~6 part of ammonium chloride；
The housing count in parts by weight including：
100 parts of sulfate slag；
0~3 part of bentonite；
0~20 part of chloridating gas absorbent；
Second 0~8 part of chlorinating agent.
Preferably, first chlorinating agent and second chlorinating agent are selected from different compounds.
Preferably, first chlorinating agent and the second chlorinating agent be respectively selected from calcium chloride, potassium chloride, sodium chloride, magnesium chloride,
One or more in iron chloride.
Preferably, the chloridating gas absorbent is selected from quick lime, lime stone or calcium hydroxide.
Preferably, the core count in parts by weight including：
100 parts of sulfate slag；
0.1~3 part of bentonite；
0.1~20 part of chloridating gas absorbent；
First 0.1~8 part of chlorinating agent；
1~6 part of ammonium chloride；
The housing count in parts by weight including：
100 parts of sulfate slag；
0.1~3 part of bentonite；
0.1~20 part of chloridating gas absorbent；
Second 0.1~8 part of chlorinating agent.
The present invention also provides a kind of preparation methods of chlorination pelletizing, which is characterized in that including：
It counts 0~8 part of 0~8 part of the first chlorinating agent and the second chlorinating agent and 100 parts of sulfate slag, swollen in parts by weight respectively
0~20 part of mixing of 0~3 part of profit soil and chloridating gas absorbent, obtains the first mixture and the second mixture；
1~6 part of water and ammonium chloride are added in first mixture, and carries out profit mill；
Mixture after the profit mill is subjected to pelletizing, obtains core；
In second mixture of core outer cladding, water is added to carry out second of profit mill, is formed and has chlamydate green-ball；
It heats up after the green-ball is carried out first time chlorination, and carries out second of chlorination, obtain chlorination pelletizing.
Preferably, first chlorinating agent and second chlorinating agent are selected from different compounds.
Preferably, first chlorinating agent and the second chlorinating agent be respectively selected from calcium chloride, potassium chloride, sodium chloride, magnesium chloride,
One or more in iron chloride.
Preferably, it is the 10%~18% of total weight of material by weight percentage moisture content to be added in the profit mill operation；
Profit time consuming is 0~6min.
Preferably,
The core count in parts by weight including：
100 parts of sulfate slag；
0.1~3 part of bentonite；
0.1~20 part of chloridating gas absorbent；
First 0.1~8 part of chlorinating agent；
1~6 part of ammonium chloride；
The housing count in parts by weight including：
100 parts of sulfate slag；
0.1~3 part of bentonite；
0.1~20 part of chloridating gas absorbent；
Second 0.1~8 part of chlorinating agent.
The present invention provides a kind of chlorination pelletizing, by building efficient chlorinated structures pelletizing, far below medium temperature chlorination temperature
HCl gases can quickly be generated under (about 800 DEG C), the extra HCl gases for having neither part nor lot in chlorination non-ferrous metal are again in chlorination process
Gas absorbent can be chlorinated quickly to absorb, ensureing that HCl is sufficient concentrations of in pelletizing while can prevent the big of chlorinating agent again
Amount waste.At high temperature in chlorination process, the HCl of chloridating gas absorbent absorption can release continuation chlorination again coloured gold
Belong to, can make up under high temperature chlorinating agent because rate of volatilization soon caused by chlorination atmosphere is inadequate in pelletizing the shortcomings that.It can so drop significantly
The consumption of low chlorinating agent improves the chlorination rate of non-ferrous metal and chlorination rate.The present invention also provides a kind of systems of chlorination pelletizing
Preparation Method selects two sections of chlorinations, chlorination is carried out first under less than traditional medium temperature chlorination temperature (about 800 DEG C), at this moment can be by portion
Point non-ferrous metal carries out chlorination, and the solid chlorinating agent chosen it is rapid decomposable go out HCl, the efficiency of chlorination, rate can be accelerated
Far above traditional chloridizing roast in medium tempera-ture.Obtained pelletizing directly carries out high temperature chlorination roasting, the chlorine that chlorination obtains at low temperature
Compound can quickly volatilize removing, and this avoids traditional chloridizing roast in medium tempera-ture to need wet-treating whole sulfate slag, causes wet method
Treating capacity is big, the irretrievable shortcoming of iron mineral.
Chloridating gas absorbent used in the present invention is absorbing extra HCl and Cl2While be also used as binding agent and carry
The green-ball and preheated ball of high sulfate slag pelletizing reduce bentonite consumption.Further, it is also possible to adjust the basicity of pelletizing, reduce
The usage amount of flux in blast furnace.
Description of the drawings
The structure diagram of chlorination pelletizing prepared by Fig. 1 embodiment of the present invention.
Specific embodiment
In order to which those skilled in the art is made to more fully understand technical scheme, With reference to embodiment
The present invention is described in further detail.
The present invention provides a kind of chlorination pelletizing, as shown in Figure 1, including core B and being coated on the core outer surface
Housing A；The core count in parts by weight including：100 parts of sulfate slag；0~3 part of bentonite；Chloridating gas absorbent 0~20
Part；First 0~8 part of chlorinating agent；1~6 part of ammonium chloride；The housing count in parts by weight including：100 parts of sulfate slag；Bentonite 0
~3 parts；0~20 part of chloridating gas absorbent；Second 0~8 part of chlorinating agent.The core and shell of chlorination pelletizing provided by the invention
In be to increase the viscosity of sulfate slag mixture so as to improving the forming ability of pelletizing doped with bentonite.The present invention passes through structure
Efficient chlorinated structures pelletizing is built, it can be under less than medium temperature chlorination temperature in chlorination process by core and shell mechanism
Quick to generate hydrogen chloride gas, the extra HCl gases for having neither part nor lot in chlorination non-ferrous metal can be chlorinated gas again in chlorination process
Body absorbent quickly absorbs, and is ensureing that HCl is sufficient concentrations of in pelletizing while can prevent a large amount of wastes of chlorinating agent again.In high temperature
In lower chlorination process, the HCl that chloridating gas absorbent absorbs can release continuation chlorination non-ferrous metal again, can make up high temperature
Lower chlorinating agent because rate of volatilization soon caused by chlorination atmosphere is inadequate in pelletizing the shortcomings that.Disappearing for chlorinating agent can so be substantially reduced
Consumption, improves the chlorination rate of non-ferrous metal and chlorination rate.
Preferably, first chlorinating agent and second chlorinating agent are selected from different compounds.Preferably, described first
Chlorinating agent and the second chlorinating agent are respectively selected from the one or more in calcium chloride, potassium chloride, sodium chloride, magnesium chloride, iron chloride.It is excellent
Choosing, the chloridating gas absorbent is selected from quick lime, lime stone or calcium hydroxide.
According to the present invention, the core is counted in parts by weight to be preferably included：100 parts of sulfate slag；0.1~3 part of bentonite；Chlorine
Change 0.1~20 part of gas absorbent；First 0.1~8 part of chlorinating agent；1~6 part of ammonium chloride；The housing is counted excellent in parts by weight
Choosing includes：100 parts of sulfate slag；0.1~3 part of bentonite；0.1~20 part of chloridating gas absorbent；Second 0.1~8 part of chlorinating agent.
The present invention also provides a kind of preparation method of chlorination pelletizing, including：
It counts 0~8 part of 0~8 part of the first chlorinating agent and the second chlorinating agent and 100 parts of sulfate slag, swollen in parts by weight respectively
0~20 part of mixing of 0~3 part of profit soil and chloridating gas absorbent, obtains the first mixture and the second mixture；
1~6 part of water and ammonium chloride are added in first mixture, and carries out profit mill；
Mixture after the profit mill is subjected to pelletizing, obtains core；
In second mixture of core outer cladding, water is added to carry out second of profit mill, is formed and has chlamydate green-ball；
It heats up after the green-ball is carried out first time chlorination, and carries out second of chlorination, obtain chlorination pelletizing.
Preferably, first chlorinating agent and second chlorinating agent are selected from different compounds.
Preferably, first chlorinating agent and the second chlorinating agent be respectively selected from calcium chloride, potassium chloride, sodium chloride, magnesium chloride,
One or more in iron chloride.
As the preferred embodiment of the present invention, it is total material by weight percentage that moisture content is added in the profit mill operation
The 10%~18% of weight；Profit time consuming is 0~6min.
By mixings such as sulfate slag, bentonite, solid chlorinating agent and chloridating gas absorbents, and add in sulfuric acid dregs mixing material
The profit mill predetermined time in damp mill is added to after the moisture for entering a certain amount of water to control its appropriate.The sulfate slag moistened after grinding is mixed
It closes material and preferably carries out pelletizing with disc-type pelletizing machine, prepare the green-ball of a diameter of 8-10mm, then wrap one outside green-ball again
Sulfuric acid dregs mixing material of the layer containing different chlorinating agents prepares the green-ball of diameter 10-16mm, such as Fig. 1.The green-ball of preparation is done with air blast
Dry case drying.
Dry bulb carries out the chlorination of 0-10 minutes first between 350-500 DEG C, then hot-bulb directly 1000-1150 DEG C it
Between carry out the chlorination of 5-20min after obtain preheated pellets of the compression strength more than 500N/.
It is the specific descriptions to the present invention program above, is below the specific embodiment of the invention.
Embodiment 1：
The Iron grade 63.0% of sulfate slag, the content 1.0% of Cu, the content 0.3% of zinc, sulfate slag is less than 0.075mm's
Content is 72.58%, is 56.06% less than 0.045mm contents.4%CaCl will be with the addition of2, 1.8% bentonite and 2%NH4Cl
Sulfate slag moisten in damp mill mill 4min, profit mill moisture 15%, profit mill after a diameter of 8- is prepared into disc balling machine
The green-ball of 10mm continues to wrap up in one layer being with the addition of CaO (basicity 1.5) and 4%CaCl in green-ball outer layer2Sulfate slag, be prepared into
The green-ball of a diameter of 10-12.5mm so that the mass ratio of pelletizing internal layer and outer layer is 1：1.Balling time is 13min, and green-ball falls
Lower intensity is 4.2 times/0.5m, and chlorination 5min, hot-bulb continue at a temperature of 1050 DEG C at a temperature of 460 DEG C after green-ball drying
Chlorination 10min.With the CaCl of the single addition 4% in sulfate slag2Pelletizing is compared, the removal efficiency of copper and zinc respectively from
34.27% and 47.26% increases to 75.63% and 85.41%, and the compression strength of preheated pellets increases to 567N/ from 387N/
It is a.
Embodiment 2：
The Iron grade 61.3% of sulfate slag, the content 1.8% of the content 0.2% of Cu, the content of Zn 0.2% and Pb, sulfuric acid
Slag is less than the content 77.75% of 0.075mm, is 60.20% less than 0.045mm contents.4%CaCl will be with the addition of2, it is 1.5% swollen
Profit soil and 2%NH4Profit grinds 2min in damp mill after the sulfate slag mixing of Cl, moistens and grinds moisture 15%, in disk pelletizing after profit mill
The green-ball of a diameter of 8-10mm is prepared into machine, continues to wrap up in one layer being with the addition of CaO (basicity 1.5) and 4% in green-ball outer layer
CaCl2Sulfate slag, be prepared into the green-ball of a diameter of 10-12.5mm so that the mass ratio of pelletizing internal layer and outer layer is 1：1.It makes
The ball time be 13min, shatter strength of green pellet be 4.6 times/0.5m, green-ball drying after at a temperature of 450 DEG C chlorination 5min, hot-bulb
Continue the chlorination 10min at a temperature of 1125 DEG C.With the CaCl of the single addition 4% in sulfate slag2Pelletizing is compared, copper, lead,
The removal efficiency of zinc increases to 88.12%, 99.67% and 87.23% from 60.27%, 97.75% and 59.27% respectively, pre- hot-bulb
The compression strength of group increases to 591N/ from 412N/.
Embodiment 3
The Iron grade 62.2% of sulfate slag, the content of Cu is 0.52%, the content 0.28% of the content 0.92% of Zn and Pb,
Sulfate slag is less than the content 79.55% of 0.075mm, is 63.12% less than 0.045mm contents.3%CaCl will be with the addition of2、
1.2% bentonite and 2%NH4Profit grinds 2min in damp mill after the sulfate slag mixing of Cl, moistens and grinds moisture 16%, in circle after profit mill
The green-ball of a diameter of 8-10mm is prepared into disk pelletizer, continuing to wrap up in one layer in green-ball outer layer is with the addition of calcium hydroxide (basicity is
And 3%CaCl 2.0)2Sulfate slag, be prepared into the green-ball of a diameter of 10-12.5mm so that the mass ratio of pelletizing internal layer and outer layer
For 1：1.Balling time is 13min, and shatter strength of green pellet is 4.2 times/0.5m, the chlorination at a temperature of 450 DEG C after green-ball drying
6min, hot-bulb continue the chlorination 13min at a temperature of 1100 DEG C.With the CaCl of the single addition 4% in sulfate slag2Pelletizing phase
Than copper, lead, the removal efficiency of zinc increase to 81.22%, 99.77% and from 65.37%, 96.75% and 57.32% respectively
80.33%, the compression strength of preheated pellets increases to 651N/ from 382N/.
Embodiment 4
The Iron grade 65.1% of sulfate slag, the content of Cu is 0.32%, the content 0.58% of the content 0.38% of Zn and Pb,
Sulfate slag is less than the content 80.55% of 0.075mm, is 66.12% less than 0.045mm contents.3%NaCl, 1.2% will be with the addition of
Bentonite and 3%NH4Profit mill 2min, profit mill moisture 16% are made after moistening mill in disk in damp mill after the sulfate slag mixing of Cl
The green-ball of a diameter of 8-10mm is prepared into ball machine, green-ball outer layer continue to wrap up in one layer be with the addition of calcium hydroxide (basicity 2.0) and
The sulfate slag of 3%NaCl is prepared into the green-ball of a diameter of 10-12.5mm so that the mass ratio of pelletizing internal layer and outer layer is 1：1.
Balling time is 13min, and shatter strength of green pellet is 4.3 times/0.5m, after green-ball drying at a temperature of 450 DEG C chlorination 6min, heat
Ball continues the chlorination 10min at a temperature of 1100 DEG C.With single at 1100 DEG C chlorination 20min and additive amount be 6%
NaCl pelletizings are compared, and copper, lead, the removal efficiency of zinc increase to respectively from 77.37%, 97.75% and 75.32% in sulfate slag pelletizing
84.62%th, 98.77% and 82.73%, the compression strength of preheated pellets increases to 521N/ from 432N/.
Embodiment 5
The Iron grade 64.03% of sulfate slag, the content 0.82% of the content 0.52% of Cu, the content of Zn 0.49% and Pb,
Sulfate slag is less than the content 80.15% of 0.075mm, is 65.30% less than 0.045mm contents.4%CaCl will be with the addition of2、
1.5% bentonite and 4%NH4Profit grinds 2min in damp mill after the sulfate slag mixing of Cl, moistens and grinds moisture 15%, in circle after profit mill
The green-ball of a diameter of 8-10mm is prepared into disk pelletizer, continuing to wrap up in one layer in green-ball outer layer is with the addition of lime stone (basicity is
And 4%CaCl 2.0)2Sulfate slag, be prepared into the green-ball of a diameter of 10-12.5mm so that the mass ratio of pelletizing internal layer and outer layer
For 1：1.Balling time is 13min, and shatter strength of green pellet is 4.8 times/0.5m, the chlorination at a temperature of 450 DEG C after green-ball drying
8min, hot-bulb continue the chlorination 12min at a temperature of 1100 DEG C, and copper, lead, the removal efficiency of zinc in sulfate slag pelletizing are
92.17%th, 97.15% and 91.36%, the compression strength of preheated pellets is 561N/.The single chlorination at 1100 DEG C
30min and CaCl2Additive amount under conditions of 8%, the removal efficiency of copper, lead, zinc in sulfate slag pelletizing is 90.12%,
98.87% and 88.33%, the compression strength of preheated pellets is 382N/.
Embodiment 6
The Iron grade 64.03% of sulfate slag, the content 0.82% of the content 0.52% of Cu, the content of Zn 0.49% and Pb,
Sulfate slag is less than the content 80.15% of 0.075mm, is 65.30% less than 0.045mm contents.4%NaCl, 0.9% will be with the addition of
Bentonite and 4%NH4Profit mill 4min, profit mill moisture 15% are made after moistening mill in disk in damp mill after the sulfate slag mixing of Cl
The green-ball of a diameter of 8-10mm is prepared into ball machine, green-ball outer layer continue to wrap up in one layer be with the addition of calcium hydroxide (basicity 2.0) and
4%CaCl2Sulfate slag, be prepared into the green-ball of a diameter of 10-12.5mm so that the mass ratio of pelletizing internal layer and outer layer is 1：1.
Balling time is 13min, and shatter strength of green pellet is 4.5 times/0.5m, after green-ball drying at a temperature of 450 DEG C chlorination 8min, heat
Ball continues the chlorination 12min at a temperature of 1050 DEG C, the removal efficiency of copper, lead, zinc in sulfate slag pelletizing is 87.17%,
94.15% and 89.23%, the compression strength of preheated pellets is 521N/.The single chlorination 30min and NaCl at 1050 DEG C
Additive amount under conditions of 8%, the removal efficiency of copper, lead, zinc in sulfate slag pelletizing is 85.26%, 96.72% and
85.89%, the compression strength of preheated pellets is 322N/.
Embodiment 7
The Iron grade 61.3% of sulfate slag, the content 1.8% of the content 0.2% of Cu, the content of Zn 0.2% and Pb, sulfuric acid
Slag is less than the content 77.75% of 0.075mm, is 60.20% less than 0.045mm contents.4%KCl, 1.5% swelling will be with the addition of
Soil and 4%NH4Profit grinds 2min in damp mill after the sulfate slag mixing of Cl, moistens and grinds moisture 15%, in disc balling machine after profit mill
In be prepared into the green-ball of a diameter of 8-10mm, continue to wrap up in one layer being with the addition of CaO (basicity 1.5) and 4%CaCl in green-ball outer layer2
Sulfate slag, be prepared into the green-ball of a diameter of 10-12.5mm so that the mass ratio of pelletizing internal layer and outer layer is 1：1.Balling time
For 13min, shatter strength of green pellet is 4.3 times/0.5m, and chlorination 8min, hot-bulb continue at a temperature of 450 DEG C after green-ball drying
Chlorination 12min at a temperature of 1125 DEG C, the removal efficiency of copper, lead, zinc in sulfate slag pelletizing is 92.56%, 99.81% and
91.20%, the compression strength of preheated pellets is 402N/.The additive amount of single chlorination 30min and KCl at 1125 DEG C is
Under conditions of 8%, copper, lead, the removal efficiency of zinc in sulfate slag pelletizing are respectively 90.25%, 98.89% and 86.22%, preheating
The compression strength of pelletizing is 520N/.
Embodiment 8
The Iron grade 63.0% of sulfate slag, the content 1.0% of Cu, the content 0.3% of zinc, sulfate slag is less than 0.075mm's
Content is 72.58%, is 56.06% less than 0.045mm contents.4%MgCl will be with the addition of2, 1.8% bentonite and 4%NH4Cl
Sulfate slag moisten in damp mill mill 4min, profit mill moisture 15%, profit mill after a diameter of 8- is prepared into disc balling machine
The green-ball of 10mm continues to wrap up in one layer being with the addition of CaO (basicity 1.5) and 4%MgCl in green-ball outer layer2Sulfate slag, be prepared into
The green-ball of a diameter of 10-12.5mm so that the mass ratio of pelletizing internal layer and outer layer is 1：1.Balling time is 13min, and green-ball falls
Lower intensity is 4.3 times/0.5m, and chlorination 8min, hot-bulb continue at a temperature of 1100 DEG C at a temperature of 460 DEG C after green-ball drying
Chlorination 12min, the removal efficiency of copper and zinc in sulfate slag pelletizing are respectively 87.52% and 91.58%, the resistance to compression of preheated pellets
Intensity is 506N/.The single chlorination 30min and MgCl of addition 8% at 1100 DEG C2Under conditions of, the copper in sulfate slag
Removal efficiency with zinc is respectively 85.63% and 88.04%, and the compression strength of preheated pellets is 356N/.
What the chlorination pelletizing and its chlorination prepared by the method that this patent is used in embodiment 1-8 obtained has coloured gold
Belong to Removral by chlorization efficiency and pelletizing compression strength is superior to the non-ferrous metal obtained under traditional chlorinated pelletizing and traditional chlorinated method
The compression strength of removal efficiency and pelletizing, preheated pellets compression strength are high.Illustrate chlorination pelletizing provided by the invention and its preparation side
Method solves prior art problem, has significant progress.
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention, protection scope of the present invention should be subject to claim limited range.For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, several improvements and modifications can also be made, these change
Protection scope of the present invention is also should be regarded as into retouching.
Claims (7)
1. a kind of chlorination pelletizing, which is characterized in that including core and the housing for being coated on the core outer surface；The core is pressed
Parts by weight meter includes：
100 parts of sulfate slag；
0.1~3 part of bentonite；
0.1~20 part of chloridating gas absorbent；
First 0.1~8 part of chlorinating agent；
1~6 part of ammonium chloride；
The housing count in parts by weight including：
100 parts of sulfate slag；
0.1~3 part of bentonite；
0.1~20 part of chloridating gas absorbent；
Second 0.1~8 part of chlorinating agent.
2. chlorination pelletizing according to claim 1, which is characterized in that first chlorinating agent and second chlorinating agent choosing
From different compounds.
3. chlorination pelletizing according to claim 1 or 2, which is characterized in that first chlorinating agent and the second chlorinating agent point
One or more not in calcium chloride, potassium chloride, sodium chloride, magnesium chloride, iron chloride.
4. chlorination pelletizing according to claim 1, which is characterized in that the chloridating gas absorbent is selected from quick lime, stone
Lime stone or calcium hydroxide.
5. a kind of preparation method of chlorination pelletizing, which is characterized in that including：
It counts 0.1~8 part of 0.1~8 part of the first chlorinating agent and the second chlorinating agent and 100 parts of sulfate slag, swollen in parts by weight respectively
0.1~20 part of mixing of 0.1~3 part of profit soil and chloridating gas absorbent, obtains the first mixture and the second mixture：
1~6 part of water and ammonium chloride are added in first mixture, and carries out profit mill；
Mixture after the profit mill is subjected to pelletizing, obtains core；
In second mixture of core outer cladding, water is added to carry out second of profit mill, is formed and has chlamydate green-ball；
It heats up after the green-ball is carried out first time chlorination, and carries out second of chlorination, obtain chlorination pelletizing.
6. preparation method according to claim 5, which is characterized in that first chlorinating agent and second chlorinating agent choosing
From different compounds.
7. the preparation method of chlorination pelletizing according to claim 5 or 6, which is characterized in that first chlorinating agent and
Dichloro agent is respectively selected from the one or more in calcium chloride, potassium chloride, sodium chloride, magnesium chloride, iron chloride.
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