CN106282549A - 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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- CN106282549A CN106282549A CN201610817308.4A CN201610817308A CN106282549A CN 106282549 A CN106282549 A CN 106282549A CN 201610817308 A CN201610817308 A CN 201610817308A CN 106282549 A CN106282549 A CN 106282549A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides a kind of chlorination pelletizing and preparation method thereof, by building efficient chlorinated structures pelletizing, HCl gas can be quickly produced under far below middle temperature chlorination temperature (about 800 DEG C), the HCl gas having neither part nor lot in chlorination non-ferrous metal unnecessary in chlorination process can be chlorinated again gas absorbent and quickly absorb, and in guarantee pelletizing, HCl can prevent again a large amount of wastes of chlorinating agent while of sufficient concentrations of.At high temperature in chlorination process, the HCl that chloridating gas absorbent absorbs can discharge again continuation chlorination non-ferrous metal, can make up the shortcoming that chlorination atmosphere in the pelletizing that chlorinating agent under high temperature causes soon because of rate of volatilization is inadequate.So can be substantially reduced the consumption of chlorinating agent, improve chlorination rate and the chlorination speed of non-ferrous metal.
Description
Technical field
The present invention relates to steel sintering raw material field, be specifically related to a kind of chlorination pelletizing and preparation method thereof.
Background technology
As a kind of important secondary resource, sulfate slag does not contain only abundant ferrum, but also containing a small amount of copper, lead, zinc
Deng non-ferrous metal.The Iron grade of sulfate slag is generally 30%～63%, is significantly higher than the iron mine average grade of China 33%, and it contains
The non-ferrous metals such as some copper, lead, zinc also have considerable recovery value.According to statistics, China discharges the sulfur of about 15,000,000 tons every year
Acid sludge, the sulfate slag stored up more is up to more than one hundred million ton, and this part of sulfuric acid slag not only pollutes environment, occupies cultivated land, and 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 metal content such as copper, lead, zinc are higher, the embedding cloth relation of mineral and complicated occurrence state.These features cause sulfate slag warp
After tradition technique of preparing processes, cannot be carried out efficiently separating between its non-ferrous metal and iron mineral, which has limited sulfate slag in system
Application in standby blast furnace burden.Therefore, if efficiently separating and remove the non-ferrous metal in sulfate slag, sulfate slag just can be as one
Plant the iron-smelting raw material of high-quality, can be with large-scale application in steel industry, it is short that this both can alleviate China's steel and iron industry iron ore deposit
The pressure lacked, it is also possible to solve the problem of environmental pollution of sulfate slag, it is also possible to reclaim a considerable number of non-ferrous metal.
In sulfate slag, the removing of non-ferrous metal mainly includes following two method the most both at home and abroad.Traditional middle temperature chlorination roasting
Burning carries out chloridizing roast in medium tempera-ture after utilizing the chlorinating agents such as NaCl and sulfate slag mixing at a temperature of about 800 DEG C.Roasting process
The solid chlorinating agents such as middle NaCl are changed into HCl or Cl2Gas, HCl or Cl2Gas and non-ferrous metal reaction generate non-ferrous metal chlorine
Compound, and iron mineral is not chlorinated.After chloridising roasting, sulfate slag may separate out non-ferrous metal chlorine therein through wet treatment again
Compound.
Traditional high temperature chlorination roasting is CaCl2Being prepared by mixing into pelletizing Deng chlorinating agent and sulfate slag, chlorinating agent is uniform
Be distributed in sulfate slag pelletizing.Sulfate slag pelletizing is through carrying out high-temp chlorination roasting after drying at a temperature of about 1000 DEG C
Burning, under high temperature, solid chlorinating agent is changed into HCl or Cl2Gas, non-ferrous metal and HCl or Cl2Gas reaction generates non-ferrous metal chlorine
Compound, chloride is at high temperature volatized in gas phase, and iron oxides can not be chlorinated and stay ball in oxidizing atmosphere
In group.The non-ferrous metal in sulfate slag pelletizing and iron mineral is separated with this.Traditional chloridizing roast in medium tempera-ture, solid chlorinating agent is 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
Low, and under lower temperature, the chlorination speed of non-ferrous metal is relatively low, HCl and Cl that a large amount of solid chlorinating agents are transformed2Gas
Just being volatized in gas phase because failing to participate in chlorination, this causes, and the consumption of chlorinating agent is big, the chloridising roasting time is long, after chlorination
Product is appointed so to be needed through wet treatment, and the treating capacity of wet treatment is big, and iron mineral cannot be recycled；
In traditional high temperature chlorination roasting, chlorinating agent is evenly distributed in sulfate slag pelletizing.This causes on the one hand solid
Chlorinating agent is in a liquid state in high temperature chlorination roasting, and the chlorinating agent of liquid can evaporate into gas phase greatly thus be greatly reduced
The chlorination efficiency of chlorinating agent；On the other hand most of HCl and Cl generated2Gas fails to participate in chlorination reaction in time and diffuse into
Enter gas phase so that the high concentration cl activating QI atmosphere of enough time in pelletizing, cannot be kept, so conventional high-temperature chlorination removing sulfur
In acid sludge, the time of chlorinating of non-ferrous metal is long, and the consumption of chlorinating agent is big.
Based on above-mentioned analysis, the most traditional chloridizing roast in medium tempera-ture or high temperature chlorination roasting, have in removing sulfate slag
All there is obvious deficiency in non-ferrous metal.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of chlorination efficiency that can improve non-ferrous metal and reduce chlorinating agent
The efficient chlorinated structures pelletizing of consumption and chlorination.
In order to solve above-mentioned technical problem, the concrete scheme that the present invention provides is as follows: a kind of chlorination pelletizing, including core and
It is coated on the housing of described core outer surface；Described core is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0～3 parts；
Chloridating gas absorbent 0～20 parts；
First chlorinating agent 0～8 parts；
Ammonium chloride 1～6 parts；
Described housing is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0～3 parts；
Chloridating gas absorbent 0～20 parts；
Second chlorinating agent 0～8 parts.
Preferably, described first chlorinating agent and described second chlorinating agent are selected from different compounds.
Preferably, described 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, described chloridating gas absorbent is selected from quick lime, limestone or slaked lime.
Preferably, described core is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0.1～3 parts；
Chloridating gas absorbent 0.1～20 parts；
First chlorinating agent 0.1～8 parts；
Ammonium chloride 1～6 parts；
Described housing is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0.1～3 parts；
Chloridating gas absorbent 0.1～20 parts；
Second chlorinating agent 0.1～8 parts.
Present invention also offers the preparation method of a kind of chlorination pelletizing, it is characterised in that including:
Score by weight not by the first chlorinating agent 0～8 parts and the second chlorinating agent 0～8 parts and sulfate slag 100 parts, swollen
0～3 part of profit soil and chloridating gas absorbent 0～20 parts of mixing, obtain the first mixture and the second mixture；
In described first mixture, add water and ammonium chloride 1～6 parts, and carry out profit mill；
Mixture after described profit mill is carried out pelletizing, obtains core；
At described core outer cladding the second mixture, add water and carry out moistening for the second time mill, formed and have chlamydate green-ball；
Heat up after described green-ball is carried out chlorination for the first time, and carry out second time chlorination, obtain chlorination pelletizing.
Preferably, described first chlorinating agent and described second chlorinating agent are selected from different compounds.
Preferably, described 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, adding moisture content in described profit mill operation is the 10%～18% of total weight of material by weight percentage；
Profit time consuming is 0～6min.
Preferably,
Described core is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0.1～3 parts；
Chloridating gas absorbent 0.1～20 parts；
First chlorinating agent 0.1～8 parts；
Ammonium chloride 1～6 parts；
Described housing is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0.1～3 parts；
Chloridating gas absorbent 0.1～20 parts；
Second chlorinating agent 0.1～8 parts.
The invention provides a kind of chlorination pelletizing, by building efficient chlorinated structures pelletizing, far below middle temperature chlorination temperature
Can quickly produce HCl gas under (about 800 DEG C), the HCl gas having neither part nor lot in chlorination non-ferrous metal unnecessary in chlorination process is again
Can be chlorinated gas absorbent quickly to absorb, in guarantee pelletizing, HCl can prevent again the big of chlorinating agent while of sufficient concentrations of
Amount waste.At high temperature in chlorination process, the HCl that chloridating gas absorbent absorbs can discharge again continuation chlorination coloured gold
Belong to, the shortcoming that chlorination atmosphere in the pelletizing that chlorinating agent under high temperature causes soon because of rate of volatilization is inadequate can be made up.So can significantly drop
The consumption of low chlorinating agent, improves chlorination rate and the chlorination speed of non-ferrous metal.Present invention also offers the system of a kind of chlorination pelletizing
Preparation Method, selects two sections of chlorinations, first carries out chlorination under less than the middle temperature chlorination temperature of tradition (about 800 DEG C), at this moment can be by portion
Point non-ferrous metal carries out chlorination, and the solid chlorinating agent chosen rapid decomposable go out HCl, the efficiency of chlorination can be accelerated, its speed
Far above traditional chloridizing roast in medium tempera-ture.The pelletizing obtained directly carries out high temperature chlorination roasting, the chlorine that chlorination obtains at low temperatures
Compound can quickly be volatilized removing, and this avoids tradition chloridizing roast in medium tempera-ture needs the whole sulfate slag of wet treatment, causes wet method
Treating capacity is big, the irretrievable shortcoming of iron mineral.
Chloridating gas absorbent used by the present invention is absorbing unnecessary HCl and Cl2While be also used as binding agent and carry
The green-ball of high sulfate slag pelletizing and preheated ball, reduce bentonite consumption.Further, it is also possible to the basicity of regulation pelletizing, reduce
The usage amount of flux in blast furnace.
Accompanying drawing explanation
The structural representation of chlorination pelletizing prepared by Fig. 1 embodiment of the present invention.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that technical scheme, below in conjunction with detailed description of the invention
The present invention is described in further detail.
The invention provides a kind of chlorination pelletizing, as it is shown in figure 1, include core B and be coated on described core outer surface
Housing A；Described core is counted by weight and is included: sulfate slag 100 parts；Bentonite 0～3 parts；Chloridating gas absorbent 0～20
Part；First chlorinating agent 0～8 parts；Ammonium chloride 1～6 parts；Described housing is counted by weight and is included: sulfate slag 100 parts；Bentonite 0
～3 parts；Chloridating gas absorbent 0～20 parts；Second chlorinating agent 0～8 parts.The core of the chlorination pelletizing that the present invention provides and shell
In be to improve the forming ability of pelletizing to increase the viscosity of sulfate slag mixture doped with bentonite.The present invention passes through structure
Build efficient chlorinated structures pelletizing, by core and shell mechanism in chlorination process can under less than middle temperature chlorination temperature permissible
Quickly producing hydrogen chloride gas, the HCl gas having neither part nor lot in chlorination non-ferrous metal unnecessary in chlorination process can be chlorinated again gas
Body absorbent quickly absorbs, and in guarantee pelletizing, HCl can prevent again a large amount of wastes of chlorinating agent while of sufficient concentrations of.At high temperature
In lower chlorination process, the HCl that chloridating gas absorbent absorbs can discharge again continuation chlorination non-ferrous metal, can make up high temperature
The shortcoming that in the pelletizing that lower chlorinating agent causes soon because of rate of volatilization, chlorination atmosphere is inadequate.So can be substantially reduced disappearing of chlorinating agent
Consumption, improves chlorination rate and the chlorination speed of non-ferrous metal.
Preferably, described first chlorinating agent and described second chlorinating agent are selected from different compounds.Preferably, described first
Chlorinating agent and the second chlorinating agent are respectively selected from one or more in calcium chloride, potassium chloride, sodium chloride, magnesium chloride, iron chloride.Excellent
Choosing, described chloridating gas absorbent is selected from quick lime, limestone or slaked lime.
According to the present invention, described core is counted by weight and is preferably included: sulfate slag 100 parts；Bentonite 0.1～3 parts；Chlorine
Change gas absorbent 0.1～20 parts；First chlorinating agent 0.1～8 parts；Ammonium chloride 1～6 parts；Described housing is counted excellent by weight
Choosing includes: sulfate slag 100 parts；Bentonite 0.1～3 parts；Chloridating gas absorbent 0.1～20 parts；Second chlorinating agent 0.1～8 parts.
Present invention also offers the preparation method of a kind of chlorination pelletizing, including:
Score by weight not by the first chlorinating agent 0～8 parts and the second chlorinating agent 0～8 parts and sulfate slag 100 parts, swollen
0～3 part of profit soil and chloridating gas absorbent 0～20 parts of mixing, obtain the first mixture and the second mixture；
In described first mixture, add water and ammonium chloride 1～6 parts, and carry out profit mill；
Mixture after described profit mill is carried out pelletizing, obtains core；
At described core outer cladding the second mixture, add water and carry out moistening for the second time mill, formed and have chlamydate green-ball；
Heat up after described green-ball is carried out chlorination for the first time, and carry out second time chlorination, obtain chlorination pelletizing.
Preferably, described first chlorinating agent and described second chlorinating agent are selected from different compounds.
Preferably, described 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 a preferred version of the present invention, adding moisture content in the mill operation of described profit is total material by weight percentage
The 10%～18% of weight；Profit time consuming is 0～6min.
Sulfate slag, bentonite, solid chlorinating agent and chloridating gas absorbent etc. are mixed, and adds in sulfate slag compound
Enter a certain amount of water to join the profit mill scheduled time in damp mill after controlling its suitable moisture.Sulfate slag after profit mill is mixed
Close material and preferably carry out pelletizing with disc-type pelletizing machine, prepare the green-ball of a diameter of 8-10mm, outside green-ball, wrap one the most again
The layer sulfate slag compound containing different chlorinating agents prepares the green-ball of diameter 10-16mm, such as Fig. 1.The air blast of the green-ball of preparation is done
Dry case is dried.
First dry bulb carries out the chlorination of 0-10 minute between 350-500 DEG C, then hot-bulb directly 1000-1150 DEG C it
Between carry out the chlorination of 5-20min after obtain the comprcssive strength preheated pellets more than 500N/.
It is more than the specific descriptions to the present invention program, 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 content.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 in disc balling machine, be prepared as a diameter of 8-
The green-ball of 10mm, continues to wrap up in one layer at green-ball outer layer and with the addition of CaO (basicity is 1.5) and 4%CaCl2Sulfate slag, be prepared as
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, green-ball chlorination 5min at a temperature of 460 DEG C after drying, and hot-bulb continues at a temperature of 1050 DEG C
Chlorination 10min.With single the CaCl of interpolation 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 comprcssive strength of preheated pellets increases to 567N/ from 387N/
Individual.
Embodiment 2:
The Iron grade 61.3% of sulfate slag, the content 0.2% of Cu, the content 1.8% of content 0.2% and Pb of Zn, sulphuric acid
The slag content 77.75% less than 0.075mm, is 60.20% less than 0.045mm content.4%CaCl will be with the addition of2, 1.5% swollen
Profit soil and 2%NH4After the sulfate slag mixing of Cl, in damp mill, profit grinds 2min, and profit mill moisture 15%, in disk pelletizing after profit mill
Machine is prepared as the green-ball of a diameter of 8-10mm, continues to wrap up in one layer at green-ball outer layer and with the addition of CaO (basicity is 1.5) and 4%
CaCl2Sulfate slag, be prepared as 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.Make
The ball time is 13min, and shatter strength of green pellet is 4.6 times/0.5m, green-ball chlorination 5min, hot-bulb at a temperature of 450 DEG C after drying
Continue chlorination 10min at a temperature of 1125 DEG C.With single the CaCl of interpolation 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 comprcssive 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 of Zn 0.92% and Pb,
The sulfate slag content 79.55% less than 0.075mm, is 63.12% less than 0.045mm content.3%CaCl will be with the addition of2、
1.2% bentonite and 2%NH4After the sulfate slag mixing of Cl, in damp mill, profit grinds 2min, profit mill moisture 16%, is justifying after profit mill
Dish pelletizer is prepared as the green-ball of a diameter of 8-10mm, continues to wrap up in one layer at green-ball outer layer and with the addition of slaked lime (basicity is
2.0) and 3%CaCl2Sulfate slag, be prepared as the green-ball of a diameter of 10-12.5mm so that pelletizing internal layer and the mass ratio of outer layer
For 1:1.Balling time is 13min, and shatter strength of green pellet is 4.2 times/0.5m, green-ball chlorination at a temperature of 450 DEG C after drying
6min, hot-bulb continues chlorination 13min at a temperature of 1100 DEG C.With single the CaCl of interpolation 4% in sulfate slag2Pelletizing phase
Ratio, 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 comprcssive 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 of Zn 0.38% and Pb,
The sulfate slag content 80.55% less than 0.075mm, is 66.12% less than 0.045mm content.To with the addition of 3%NaCl, 1.2%
Bentonite and 3%NH4After the sulfate slag mixing of Cl, in damp mill, profit grinds 2min, profit mill moisture 16%, makes at disk after profit mill
Ball machine is prepared as the green-ball of a diameter of 8-10mm, green-ball outer layer continue to wrap up in one layer with the addition of slaked lime (basicity is 2.0) and
The sulfate slag of 3%NaCl, is prepared as 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, green-ball chlorination 6min at a temperature of 450 DEG C after drying, heat
Ball continues chlorination 10min at a temperature of 1100 DEG C.With single at 1100 DEG C chlorination 20min and addition be 6%
NaCl pelletizing is compared, and in sulfate slag pelletizing, copper, lead, the removal efficiency of zinc increase to from 77.37%, 97.75% and 75.32% respectively
84.62%, 98.77% and 82.73%, the comprcssive strength of preheated pellets increases to 521N/ from 432N/.
Embodiment 5
The Iron grade 64.03% of sulfate slag, the content 0.52% of Cu, the content 0.82% of content 0.49% and Pb of Zn,
The sulfate slag content 80.15% less than 0.075mm, is 65.30% less than 0.045mm content.4%CaCl will be with the addition of2、
1.5% bentonite and 4%NH4After the sulfate slag mixing of Cl, in damp mill, profit grinds 2min, profit mill moisture 15%, is justifying after profit mill
Dish pelletizer is prepared as the green-ball of a diameter of 8-10mm, continues to wrap up in one layer at green-ball outer layer and with the addition of limestone (basicity is
2.0) and 4%CaCl2Sulfate slag, be prepared as the green-ball of a diameter of 10-12.5mm so that pelletizing internal layer and the mass ratio of outer layer
For 1:1.Balling time is 13min, and shatter strength of green pellet is 4.8 times/0.5m, green-ball chlorination at a temperature of 450 DEG C after drying
8min, hot-bulb continues chlorination 12min at a temperature of 1100 DEG C, and the copper in sulfate slag pelletizing, lead, the removal efficiency of zinc are
92.17%, 97.15% and 91.36%, the comprcssive strength of preheated pellets is 561N/.Single chlorination at 1100 DEG C
30min and CaCl2Addition be 8% under conditions of, the copper in sulfate slag pelletizing, lead, the removal efficiency of zinc be 90.12%,
98.87% and 88.33%, the comprcssive strength of preheated pellets is 382N/.
Embodiment 6
The Iron grade 64.03% of sulfate slag, the content 0.52% of Cu, the content 0.82% of content 0.49% and Pb of Zn,
The sulfate slag content 80.15% less than 0.075mm, is 65.30% less than 0.045mm content.To with the addition of 4%NaCl, 0.9%
Bentonite and 4%NH4After the sulfate slag mixing of Cl, in damp mill, profit grinds 4min, profit mill moisture 15%, makes at disk after profit mill
Ball machine is prepared as the green-ball of a diameter of 8-10mm, green-ball outer layer continue to wrap up in one layer with the addition of slaked lime (basicity is 2.0) and
4%CaCl2Sulfate slag, be prepared as 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, green-ball chlorination 8min at a temperature of 450 DEG C after drying, heat
Ball continues chlorination 12min at a temperature of 1050 DEG C, the copper in sulfate slag pelletizing, lead, the removal efficiency of zinc be 87.17%,
94.15% and 89.23%, the comprcssive strength of preheated pellets is 521N/.Single chlorination 30min and NaCl at 1050 DEG C
Addition be 8% under conditions of, the copper in sulfate slag pelletizing, lead, the removal efficiency of zinc are 85.26%, 96.72% and
85.89%, the comprcssive strength of preheated pellets is 322N/.
Embodiment 7
The Iron grade 61.3% of sulfate slag, the content 0.2% of Cu, the content 1.8% of content 0.2% and Pb of Zn, sulphuric acid
The slag content 77.75% less than 0.075mm, is 60.20% less than 0.045mm content.4%KCl, 1.5% swelling will be with the addition of
Soil and 4%NH4After the sulfate slag mixing of Cl, in damp mill, profit grinds 2min, and profit mill moisture 15%, at disc balling machine after profit mill
In be prepared as the green-ball of a diameter of 8-10mm, continue to wrap up in one layer at green-ball outer layer and with the addition of CaO (basicity is 1.5) and 4%CaCl2
Sulfate slag, be prepared as 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, green-ball chlorination 8min at a temperature of 450 DEG C after drying, and hot-bulb continues
Chlorination 12min at a temperature of 1125 DEG C, the copper in sulfate slag pelletizing, lead, the removal efficiency of zinc are 92.56%, 99.81% and
91.20%, the comprcssive strength of preheated pellets is 402N/.Single at 1125 DEG C the addition of chlorination 30min and KCl be
Under conditions of 8%, the copper in sulfate slag pelletizing, lead, the removal efficiency of zinc are respectively 90.25%, 98.89% and 86.22%, preheating
The comprcssive 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 content.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 in disc balling machine, be prepared as a diameter of 8-
The green-ball of 10mm, continues to wrap up in one layer at green-ball outer layer and with the addition of CaO (basicity is 1.5) and 4%MgCl2Sulfate slag, be prepared as
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, green-ball chlorination 8min at a temperature of 460 DEG C after drying, and hot-bulb continues at a temperature of 1100 DEG C
Chlorination 12min, copper and the removal efficiency of zinc in sulfate slag pelletizing be respectively 87.52% and 91.58%, the resistance to compression of preheated pellets
Intensity is 506N/.Single chlorination 30min and the MgCl of interpolation 8% at 1100 DEG C2Under conditions of, the copper in sulfate slag
Being respectively 85.63% and 88.04% with the removal efficiency of zinc, the comprcssive strength of preheated pellets is 356N/.
What the chlorination pelletizing prepared by the method using this patent in embodiment 1-8 and chlorination thereof were obtained has coloured gold
Genus Removral by chlorization efficiency and pelletizing comprcssive strength are superior under traditional chlorinated pelletizing and traditional chlorinated method the non-ferrous metal obtained
Removal efficiency and the comprcssive strength of pelletizing, preheated pellets comprcssive strength is high.Chlorination pelletizing and preparation side thereof that the present invention provides are described
Method solves prior art problem, has the most progressive.
Below it is only the preferred embodiment of the present invention, it is noted that it is right that above-mentioned preferred implementation is not construed as
The restriction of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, it is also possible to make some improvements and modifications, these change
Enter and retouch and also should be regarded as protection scope of the present invention.
Claims (10)
1. a chlorination pelletizing, it is characterised in that include core and be coated on the housing of described core outer surface；Described core is pressed
Parts by weight meter includes:
Sulfate slag 100 parts；
Bentonite 0～3 parts；
Chloridating gas absorbent 0～20 parts；
First chlorinating agent 0～8 parts；
Ammonium chloride 1～6 parts；
Described housing is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0～3 parts；
Chloridating gas absorbent 0～20 parts；
Second chlorinating agent 0～8 parts.
Chlorination pelletizing the most according to claim 1, it is characterised in that described first chlorinating agent and described second chlorinating agent choosing
From different compounds.
Chlorination pelletizing the most according to claim 1 and 2, it is characterised in that described first chlorinating agent and the second chlorinating agent divide
Xuan Zi one or more in calcium chloride, potassium chloride, sodium chloride, magnesium chloride, iron chloride.
Chlorination pelletizing the most according to claim 1, it is characterised in that described chloridating gas absorbent is selected from quick lime, stone
Lime stone or slaked lime.
Chlorination pelletizing the most according to claim 1, it is characterised in that
Described core is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0.1～3 parts；
Chloridating gas absorbent 0.1～20 parts；
First chlorinating agent 0.1～8 parts；
Ammonium chloride 1～6 parts；
Described housing is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0.1～3 parts；
Chloridating gas absorbent 0.1～20 parts；
Second chlorinating agent 0.1～8 parts.
6. the preparation method of a chlorination pelletizing, it is characterised in that including:
Score by weight not by the first chlorinating agent 0～8 parts and the second chlorinating agent 0～8 parts and sulfate slag 100 parts, bentonite 0
～3 parts and chloridating gas absorbent 0～20 parts of mixing, obtain the first mixture and the second mixture；
In described first mixture, add water and ammonium chloride 1～6 parts, and carry out profit mill；
Mixture after described profit mill is carried out pelletizing, obtains core；
At described core outer cladding the second mixture, add water and carry out moistening for the second time mill, formed and have chlamydate green-ball；
Heat up after described green-ball is carried out chlorination for the first time, and carry out second time chlorination, obtain chlorination pelletizing.
Preparation method the most according to claim 6, it is characterised in that described first chlorinating agent and described second chlorinating agent choosing
From different compounds.
8. according to the preparation method of the chlorination pelletizing described in claim 5 or 6, it is characterised in that described first chlorinating agent and
Dichloro agent is respectively selected from one or more in calcium chloride, potassium chloride, sodium chloride, magnesium chloride, iron chloride.
The preparation method of chlorination pelletizing the most according to claim 6, it is characterised in that add moisture content in the mill operation of described profit
It is the 10%～18% of total weight of material by weight percentage；Profit time consuming is 0～6min.
The preparation method of chlorination pelletizing the most according to claim 6, it is characterised in that
Described core is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0.1～3 parts；
Chloridating gas absorbent 0.1～20 parts；
First chlorinating agent 0.1～8 parts；
Ammonium chloride 1～6 parts；
Described housing is counted by weight and is included:
Sulfate slag 100 parts；
Bentonite 0.1～3 parts；
Chloridating gas absorbent 0.1～20 parts；
Second chlorinating agent 0.1～8 parts.
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| CN113373301A (en) * | 2021-06-16 | 2021-09-10 | 矿冶科技集团有限公司 | Method for preparing chlorinated pellets by using waste plastics and products obtained by method |
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