CN108034812A - A kind of processing method of lead cadmia - Google Patents
A kind of processing method of lead cadmia Download PDFInfo
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- CN108034812A CN108034812A CN201711141662.0A CN201711141662A CN108034812A CN 108034812 A CN108034812 A CN 108034812A CN 201711141662 A CN201711141662 A CN 201711141662A CN 108034812 A CN108034812 A CN 108034812A
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
-
- 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
- C22B13/00—Obtaining lead
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
-
- 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
- C22B7/04—Working-up slag
-
- 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 processing method of lead cadmia, including step：(1) slag of high Pb, Zn content, the first reducing agent, the first additive and first binder are mixed, obtains high Pb, Zn content mixture；The slag of low Pb, Zn content, the second reducing agent, Second addition and the second binding agent are mixed, obtain low Pb, Zn content mixture；(2) high Pb, Zn content mixture and low Pb, Zn content mixture are put into progress balling-up processing in molding machine respectively, respectively obtains high Pb, Zn content pelletizing and low Pb, Zn content pelletizing；(3) it will be reduced in high Pb, Zn content pelletizing and low Pb, Zn content pelletizing input reduction roasting device, obtain metallized pellet, lead metal and zinc metal.The method of the present invention is easy to operate, feasible, the ability of rotary hearth furnace processing lead cadmia can be effectively improved, the volatility of the valuable metal such as lead, zinc, silver in pelletizing is ensured in the case that productivity improves more than 30%, and the degree of metalization of upper and lower bed of cloth pelletizing will not be reduced because the bed of material thickens.
Description
Technical field
The present invention relates to nonferrous metallurgy and energy technology field, and in particular to a kind of processing method of lead cadmia.
Background technology
China's Lead-zinc Smelting Enterprises scale and quantity expand year by year, and lead zinc yield quickly increases, smelting technique obtain greatly into
Exhibition.But lead-zinc smelting technological process is complicated, the link that pollutant produces is more.The fast development of lead-zinc smelting, causes a large amount of
Exhaust gas, sewage, waste residue (such as Lead Smelting in Blast Furnace slag, jarosite slag) generation, cause serious environmental pollution.Wherein,
The yield of waste residue is more.According to the National Development and Reform Commission《Large solid waste utilizes embodiment》In statistics,
China is about 3.15 hundred million in the melting waste slag amount of output in 2010, wherein the yield of only lead and zinc smelting dreg has just reached 430
Ten thousand tons.
Meanwhile substantial amounts of leaded zinc fume mud can be also produced in steel smelting procedure, largely used containing lead and zinc smelting dreg
It is traditional it is any topple over, the outdoor processing mode banked up or simply filled, take the soil of large area, cause land resource tight
Lack.Over time, due to weathering and the effect of rain drop erosion, the metallic element in lead and zinc smelting dreg can invade sky
Gas and water body and soil, become important pollution sources.If without rational recycling and utilized, not only jeopardize human and animal's
Health, influences the growth of plant and vegetation, and causes the waste of valuable metal resource.
Become lead zinc smelting how to efficiently use valuable elements such as the lead containing lead and zinc smelting dreg and effectively in extraction slag, zinc, iron
Steel and the key of steel industry sustainable development.
The prior art is mainly extracted by the way of rotary hearth furnace direct-reduction, however, being reduced directly in rotary hearth furnace
Cheng Zhong, relies primarily on radiant heat transfer and is from top to bottom delivered to the bed of material, and heat transfer efficiency is low, can only carry out thin bed of material operation, limit
Turn the large-scale application of bottom direct-reduction.
The content of the invention
In view of the deficiencies of the prior art, it is an object of the invention to provide a kind of processing method of lead cadmia.
To achieve these goals, the present invention uses following technical scheme：
A kind of processing method of lead cadmia, comprises the following steps：
(1) dispensing mixes：The slag of high Pb, Zn content, the first reducing agent, the first additive and first binder are mixed, obtained
To high Pb, Zn content mixture；The slag of low Pb, Zn content, the second reducing agent, Second addition and the second binding agent are mixed, obtained
To low Pb, Zn content mixture；
(2) it is molded：The high Pb, Zn content mixture and the low Pb, Zn content mixture are put into molding machine respectively
Middle progress balling-up processing, respectively obtains high Pb, Zn content pelletizing and low Pb, Zn content pelletizing；
(3) reduction roasting：By the high Pb, Zn content pelletizing and the low Pb, Zn content pelletizing input reduction roasting device
In reduced, obtain metallized pellet, lead metal and zinc metal.
Further, the reduction roasting device is rotary hearth furnace, along away from the rotary hearth furnace cloth tray direction according to
The first cloth area of secondary formation and the second cloth area, the first cloth area arrange the low Pb, Zn content pelletizing, second cloth
Expect that area arranges the high Pb, Zn content pelletizing.
Further, two cloth material mouths are set on the rotary hearth furnace, to the low Pb, Zn content pelletizing and the high lead zinc
Content pelletizing distinguishes cloth, and the low Pb, Zn content pelletizing cloth, in lower floor, the high Pb, Zn content pelletizing cloth is upper
Layer.
Further, the fabric thickness of the high Pb, Zn content pelletizing is 40-80mm, the cloth of the low Pb, Zn content pelletizing
Material thickness is 30-50mm.
Further, the content summation ＞ 10wt% of the lead in the slag of the high Pb, Zn content, zinc and sulphur；The low lead zinc
The content summation ＜ 10wt% of lead, zinc and sulphur in the slag of content.
Further,
Weight ratio between the slag of the high Pb, Zn content, the first reducing agent, the first additive and first binder is 100
∶(8-25)∶(1-20)∶(0.1-10)；
Weight ratio between the slag of the low Pb, Zn content, the second reducing agent, Second addition and the second binding agent is 100
∶(8-25)∶(1-15)∶(0.1-5)。
Further, the first additive is one kind in dolomite, lime stone, silica, magnesite, silica, lime
It is or several.
Further, Second addition is the one or more in lime stone, sodium carbonate, sodium sulphate, magnesium sulfate.
Further, the ternary basicity of the high Pb, Zn content pelletizing is：(CaO+MgO)/SiO2≤0.25；Or (CaO+
MgO)/SiO2≥2.0；Or 1≤(CaO+MgO)/SiO2≤1.3。
Further, the temperature of reduction roasting is 1220-1400 DEG C, and the time of reduction roasting is 20-60min.
Compared with prior art, the advantageous effects of the processing method of lead cadmia of the invention are：
The present invention realizes deep-bed sintering in the case where not changing existing reduction roasting device such as rotary hearth furnace structure,
The treatment effeciency of rotary hearth furnace is improved, it is easy to operate, feasible, the ability of rotary hearth furnace processing lead cadmia can be effectively improved, in productivity
Improve the volatility for ensureing the valuable metal such as lead, zinc, silver in pelletizing in the case of more than 30%, and upper and lower bed of cloth pelletizing
Degree of metalization will not be reduced because the bed of material thickens.
Brief description of the drawings
Fig. 1 is the flow diagram of the processing method of the lead cadmia of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right with reference to embodiment and attached drawing
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
As shown in Figure 1, the present invention provides a kind of processing method of lead cadmia, comprise the following steps：
(1) dispensing mixes：The slag of high Pb, Zn content, the first reducing agent, the first additive and first binder are mixed, obtained
To high Pb, Zn content mixture；The slag of low Pb, Zn content, the second reducing agent, Second addition and the second binding agent are mixed, obtained
To low Pb, Zn content mixture；
(2) it is molded：By high Pb, Zn content mixture and low Pb, Zn content mixture put into respectively in molding machine carry out into
Ball processing, respectively obtains high Pb, Zn content pelletizing and low Pb, Zn content pelletizing；
(3) reduction roasting：It will be gone back in high Pb, Zn content pelletizing and low Pb, Zn content pelletizing input reduction roasting device
Original, obtains metallized pellet, lead metal and zinc metal.
In step (1), reduction roasting device is rotary hearth furnace, is sequentially formed along the direction of the cloth tray away from rotary hearth furnace
First cloth area and the second cloth area, the first cloth area cloth set low Pb, Zn content pelletizing, and the second cloth area arranges high Pb, Zn content
Pelletizing.In a preferred embodiment, two cloth material mouths are set on rotary hearth furnace, to low Pb, Zn content pelletizing and high Pb, Zn content pelletizing
Cloth respectively, and low Pb, Zn content pelletizing cloth, in lower floor, high Pb, Zn content pelletizing cloth is on upper strata.Low Pb, Zn content pelletizing
Rotary furnace bottom is first distributed into, when furnace bottom rotates to the feed bin position of high Pb, Zn content pelletizing, the cloth on low Pb, Zn content pelletizing
Enter high Pb, Zn content pelletizing, realize double-layer cloth, fabric thickness increase.
Wherein, the fabric thickness of high Pb, Zn content pelletizing is 40-80mm, and the fabric thickness of low Pb, Zn content pelletizing is 30-
50mm.Second cloth area i.e. upper strata cloth area arrangement are containing high lead, zinc, the pelletizing of sulphur, the volatility member in reduction process
After element volatilization, pelletizing reduces, and the gap that heat passes through can be allowed by producing between the pelletizing in upper strata cloth area, transfer heat to lower floor
Low Pb, Zn content pelletizing in cloth area, the gross thickness of two kinds of pelletizings can reach 70~130mm, substantially increase rotary hearth furnace
Handle the ability of lead cadmia.
In step (1), the content summation ＞ 10wt% of lead, zinc and sulphur in the slag of high Pb, Zn content；Low Pb, Zn content
Slag in lead, the content summation ＜ 10wt% of zinc and sulphur.
In step (1), the weight between the slag of high Pb, Zn content, the first reducing agent, the first additive and first binder
Amount is than being 100: (8-25): (1-20): (0.1-10)；The slag of low Pb, Zn content, the second reducing agent, Second addition and second are viscous
It is 100 to tie the weight ratio between agent: (8-25): (1-15): (0.1-5).Low Pb, Zn content pelletizing temperature in lower layer mix feeding area
Relatively low, the addition of Second addition can promote the reduction of iron, lead, zinc in low Pb, Zn content pelletizing.First binder and
The species of second binding agent can be the one or more in organic binder bond, inorganic binder, such as can be bentonite, water
The binding agents such as glass, starch, dextrin, molasses, sodium humate.First reducing agent can be semi-coke, coal dust, and the second reducing agent can be with
It is anthracite, coke.
In step (1), the first additive is one in dolomite, lime stone, silica, magnesite, silica, lime
Kind is several.Second addition is lime stone, the one or more in sodium carbonate, sodium sulphate, magnesium sulfate.High Pb, Zn content pelletizing
Ternary basicity be：(CaO+MgO)/SiO2≤0.25；Or (CaO+MgO)/SiO2≥2.0；Or 1≤(CaO+MgO)/SiO2≤
1.3.Preferably 1≤(CaO+MgO)/SiO2≤ 1.3, or (CaO+MgO)/SiO2≤0.25.It can be protected in this ternary alkalinity ranges
The high Pb, Zn content pelletizing demonstrate,proved in the cloth area of upper strata is non-fusible at 1400 DEG C.Because high Pb, Zn content pelletizing directly contacts high temperature,
High Pb, Zn content pelletizing needs to add additive to increase fusing point, so as to ensure that high Pb, Zn content pelletizing is non-fusible at high temperature.
Addition first binder can ensure high Pb, Zn content pelletizing in reduction process lead, zinc, sulphur volatilization after pelletizing in the same of diminution
Intensity certain Shi Nengyou, ensures the gas permeability in upper strata cloth area, heat is quickly delivered to lower layer mix feeding area.
Wherein, the weight ratio between the slag of high Pb, Zn content, the first reducing agent, the first additive and first binder is preferred
For 100: (8-25): (1-20): (0.1-8), if content of binder is too small, high Pb, Zn content pellet strength is poor, enters stove
Dusting or in reduction process with lead in high Pb, Zn content pelletizing, zinc, sulphur volatilization and dusting, cause bed permeability to become
Difference, heat cannot be delivered to bottom.If content of binder is excessive, binding agent consumption, lead cadmia processed in units can be increased
Measure energy consumption, the production cost increases.
In step (3), the temperature of reduction roasting is 1220-1400 DEG C, preferably 1270-1370 DEG C, reduction roasting when
Between be 20-60min.If rotary hearth furnace reduction temperature is low, the time is short, low Pb, Zn content of the pelletizing especially in lower layer mix feeding area
The heat that pelletizing receives is few, and reduction and volatilization effect are poor, if rotary hearth furnace reduction temperature is excessive, time length, upper strata cloth
High Pb, Zn content pellets in area, cause poor air permeability.Wherein, lead metal and zinc metal can be recycled in flue.
Embodiment 1
Contain in the slag of high Pb, Zn content：Pb 2.18wt%, Zn 3.67wt%, S 10.31wt%, CaO
2.03wt%, MgO 1.2wt%, SiO211.22wt%, contains in the slag of low Pb, Zn content：Pb 0.78wt%, Zn
2.01wt%, S 1.32wt%, CaO 12.21wt%, MgO 6.22wt%, SiO226.14wt%, by high Pb, Zn content
The slag of slag and low Pb, Zn content carries out dispensing with reducing agent, additive and binding agent according to following weight proportion respectively, respectively
Obtain high Pb, Zn content mixture and low Pb, Zn content mixture.Wherein, the slag of high Pb, Zn content: semi-coke: dolomite: bentonite
=100: 18: 18: 7, the slag of low Pb, Zn content: anthracite: sodium carbonate: molasses=100: 20: 5: 3, high Pb, Zn content is mixed
Thing and low Pb, Zn content mixture put into molding machine progress balling-up processing respectively, respectively obtain high Pb, Zn content pelletizing and low
Pb, Zn content pelletizing.The ternary basicity of high Pb, Zn content pelletizing is 1.12, and the ternary basicity of low Pb, Zn content pelletizing is 0.705.
Low Pb, Zn content pelletizing is arranged in the lower layer mix feeding area of rotary furnace bottom, fabric thickness 30mm, by high Pb, Zn content pelletizing cloth
Put on low Pb, Zn content pelletizing, fabric thickness 50mm.Rotary hearth furnace reduction temperature is 1280 DEG C, recovery time 55min.High lead zinc
The degree of metalization of content pelletizing and low Pb, Zn content pelletizing is respectively 90.5% and 88.9%, and lead removes in high Pb, Zn content pelletizing
Rate is 95.14%, and zinc extrusion rate is 99.12%, and lead extrusion rate is 92.34% in low Pb, Zn content pelletizing, zinc extrusion rate
97.87%.Obtained metallized pellet obtains the full iron that mass fraction is 90.05% by mill ore magnetic selection, and iron recovery is
88.36% metal iron powder, productivity improve more than 30% compared with the individual layer cloth of the prior art.
The method of the present invention is easy to operate, feasible, can effectively improve the ability of rotary hearth furnace processing lead cadmia, be carried in productivity
Ensure the volatility of the valuable metal such as lead, zinc in pelletizing, and the metallization of upper and lower bed of cloth pelletizing in the case of high more than 30%
Rate will not be reduced because the bed of material thickens.
Embodiment 2
Contain in the slag of high Pb, Zn content：Pb 2.18wt%, Zn 3.67wt%, S 10.31wt%, CaO
2.03wt%, MgO 1.2wt%, SiO211.22wt%, contains in the slag of low Pb, Zn content：Pb 0.78wt%, Zn
2.01wt%, S 1.32wt%, CaO 12.21wt%, MgO 6.22wt%, SiO226.14wt%, by high Pb, Zn content
The slag of slag and low Pb, Zn content carries out dispensing with reducing agent, additive and binding agent according to following weight proportion respectively, respectively
Obtain high Pb, Zn content mixture and low Pb, Zn content mixture.Wherein, the slag of high Pb, Zn content: coal dust: silica: starch solution
=100: 20: 5: 10, the slag of low Pb, Zn content: coke: lime stone: bentonite=100: 21: 10: 5, high Pb, Zn content is mixed
Thing and low Pb, Zn content mixture put into molding machine progress balling-up processing respectively, respectively obtain high Pb, Zn content pelletizing and low
Pb, Zn content pelletizing.The ternary basicity of high Pb, Zn content pelletizing is 0.201, and the ternary basicity of low Pb, Zn content pelletizing is 1.05.
Low Pb, Zn content pelletizing is arranged in the lower layer mix feeding area of rotary furnace bottom, fabric thickness 50mm, by high Pb, Zn content pelletizing
It is arranged on low Pb, Zn content pelletizing, fabric thickness 50mm.Rotary hearth furnace reduction temperature is 1300 DEG C, recovery time 50min.High lead
The degree of metalization of Zn content pelletizing and low Pb, Zn content pelletizing is respectively 91.02% and 88.17%, lead in high Pb, Zn content pelletizing
Removal efficiency is 95.32%, and zinc extrusion rate is 98.98%, and lead extrusion rate is 91.78% in low Pb, Zn content pelletizing, zinc extrusion rate
For 97.01%.Obtained metallized pellet obtains the full iron that mass fraction is 89.73%, iron recovery by mill ore magnetic selection
87.39% metal iron powder.Productivity improves more than 50% compared with the individual layer cloth of the prior art.
The method of the present invention is easy to operate, feasible, can effectively improve the ability of rotary hearth furnace processing lead cadmia, be carried in productivity
Ensure the volatility of the valuable metal such as lead, zinc in pelletizing, and the metallization of upper and lower bed of cloth pelletizing in the case of high more than 30%
Rate will not be reduced because the bed of material thickens.
Embodiment 3
Contain in the slag of high Pb, Zn content：Pb 2.18wt%, Zn 3.67wt%, S 10.31wt%, CaO
2.03wt%, MgO 1.2wt%, SiO211.22wt%, contains in the slag of low Pb, Zn content：Pb 0.78wt%, Zn
2.01wt%, S 1.32wt%, CaO 12.21wt%, MgO 6.22wt%, SiO226.14wt%, by high Pb, Zn content
The slag of slag and low Pb, Zn content carries out dispensing with reducing agent, additive and binding agent according to following weight proportion respectively, respectively
Obtain high Pb, Zn content mixture and low Pb, Zn content mixture.Wherein, the slag of high Pb, Zn content: semi-coke: lime stone: bentonite
=100: 8: 1: 0.1, the slag of low Pb, Zn content: anthracite: sodium sulphate: molasses=100: 8: 1: 0.1, high Pb, Zn content is mixed
Thing and low Pb, Zn content mixture put into molding machine progress balling-up processing respectively, respectively obtain high Pb, Zn content pelletizing and low
Pb, Zn content pelletizing.The ternary basicity of high Pb, Zn content pelletizing is 1, and the ternary basicity of low Pb, Zn content pelletizing is 0.7.By low lead
Zn content pelletizing is arranged in the lower layer mix feeding area of rotary furnace bottom, and fabric thickness 30mm, high Pb, Zn content pelletizing is arranged in low
On Pb, Zn content pelletizing, fabric thickness 40mm.Rotary hearth furnace reduction temperature is 1220 DEG C, recovery time 60min.High Pb, Zn content ball
The degree of metalization of group and low Pb, Zn content pelletizing is respectively 90.25% and 88.39%, and lead removal efficiency is in high Pb, Zn content pelletizing
95.34%, zinc extrusion rate is 99.41%, and lead extrusion rate is 92.65% in low Pb, Zn content pelletizing, zinc extrusion rate 97.18%.
Obtained metallized pellet obtains the full iron that mass fraction is 90.15% by mill ore magnetic selection, and iron recovery is 88.06% gold
Belong to iron powder, productivity improves more than 40% compared with the individual layer cloth of the prior art.
The method of the present invention is easy to operate, feasible, can effectively improve the ability of rotary hearth furnace processing lead cadmia, be carried in productivity
Ensure the volatility of the valuable metal such as lead, zinc in pelletizing, and the metallization of upper and lower bed of cloth pelletizing in the case of high more than 30%
Rate will not be reduced because the bed of material thickens.
Embodiment 4
Contain in the slag of high Pb, Zn content：Pb 2.18wt%, Zn 3.67wt%, S 10.31wt%, CaO
2.03wt%, MgO 1.2wt%, SiO211.22wt%, contains in the slag of low Pb, Zn content：Pb 0.78wt%, Zn
2.01wt%, S 1.32wt%, CaO 12.21wt%, MgO 6.22wt%, SiO226.14wt%, by high Pb, Zn content
The slag of slag and low Pb, Zn content carries out dispensing with reducing agent, additive and binding agent according to following weight proportion respectively, respectively
Obtain high Pb, Zn content mixture and low Pb, Zn content mixture.Wherein, the slag of high Pb, Zn content: coal dust: silica: starch
Solution=100: 25: 20: 10, the slag of low Pb, Zn content: coke: lime stone: dextrin=100: 25: 15: 5, by high Pb, Zn content
Mixture and low Pb, Zn content mixture put into progress balling-up processing in molding machine respectively, respectively obtain high Pb, Zn content pelletizing
With low Pb, Zn content pelletizing.The ternary basicity of high Pb, Zn content pelletizing is 1.3, and the ternary basicity of low Pb, Zn content pelletizing is
1.22.Low Pb, Zn content pelletizing is arranged in the lower layer mix feeding area of rotary furnace bottom, fabric thickness 50mm, by high Pb, Zn content
Pelletizing is arranged on low Pb, Zn content pelletizing, fabric thickness 80mm.Rotary hearth furnace reduction temperature is 1400 DEG C, recovery time 20min.
The degree of metalization of high Pb, Zn content pelletizing and low Pb, Zn content pelletizing is respectively 91.20% and 88.71%, high Pb, Zn content pelletizing
Middle lead removal efficiency is 95.62%, and zinc extrusion rate is 98.99%, and lead extrusion rate is 90.99% in low Pb, Zn content pelletizing, and zinc takes off
Extracting rate is 97.05%.Obtained metallized pellet obtains the full iron that mass fraction is 89.79%, iron recycling by mill ore magnetic selection
The metal iron powder of rate 87.60%.Productivity improves more than 50% compared with the individual layer cloth of the prior art.
The method of the present invention is easy to operate, feasible, can effectively improve the ability of rotary hearth furnace processing lead cadmia, be carried in productivity
Ensure the volatility of the valuable metal such as lead, zinc in pelletizing, and the metallization of upper and lower bed of cloth pelletizing in the case of high more than 30%
Rate will not be reduced because the bed of material thickens.
Embodiment 5
Contain in the slag of high Pb, Zn content：Pb 3.36wt%, Zn 15.52wt%, Ag 0.015wt%, S
5.50wt%, CaO 3.22wt%, MgO 1.23wt%, SiO214.03wt%, contains in the slag of low Pb, Zn content：Pb
1.21wt%, Zn 2.34wt%, S 0.89wt%, CaO 3.22wt%, MgO 1.23wt%, SiO214.03wt%, by height
The slag of the slag of Pb, Zn content and low Pb, Zn content is carried out with reducing agent, additive and binding agent according to following weight proportion respectively
Dispensing, respectively obtains high Pb, Zn content mixture and low Pb, Zn content mixture.Wherein, the slag of high Pb, Zn content: coal dust: magnesite
Ore deposit: waterglass=100: 23: 18: 8, the slag of low Pb, Zn content: coke: magnesium sulfate: sodium humate=100: 18: 2: 3, by high lead
Zn content mixture and low Pb, Zn content mixture put into progress balling-up processing in molding machine respectively, respectively obtain high lead zinc and contain
Measure pelletizing and low Pb, Zn content pelletizing.The ternary basicity of high Pb, Zn content pelletizing is 1.04, the ternary alkali of low Pb, Zn content pelletizing
Spend for 0.77.Low Pb, Zn content pelletizing is arranged in the lower layer mix feeding area of rotary furnace bottom, fabric thickness 50mm, by high lead zinc
Content pelletizing is arranged on low Pb, Zn content pelletizing, fabric thickness 80mm.Rotary hearth furnace reduction temperature is 1350 DEG C, the recovery time
40min.The degree of metalization of high Pb, Zn content pelletizing and low Pb, Zn content pelletizing is respectively 92.36% and 88.59%, and high lead zinc contains
It is 95.81% to measure lead removal efficiency in pelletizing, and zinc extrusion rate is 99.25%, and silver-colored extrusion rate is 85.66%.Low Pb, Zn content pelletizing
Middle lead extrusion rate is 92.11%, and zinc extrusion rate is 97.46%.Obtained metallized pellet obtains quality point by mill ore magnetic selection
The full iron for 90.33%, the metal iron powder of iron recovery 89.79% are counted, productivity is improved compared with the individual layer cloth of the prior art
More than 40%.
The method of the present invention is easy to operate, feasible, can effectively improve the ability of rotary hearth furnace processing lead cadmia, be carried in productivity
Ensure the volatility of the valuable metal such as lead, zinc, silver in pelletizing, and the gold of upper and lower bed of cloth pelletizing in the case of high more than 30%
Belonging to rate will not reduce because the bed of material thickens.
Embodiment 6
Contain in the slag of high lead cadmia content：Pb 3.36wt%, Zn 15.52wt%, Ag 0.015wt%, S
5.50wt%, CaO 3.22wt%, MgO 1.23wt%, SiO214.03wt%, contains in the slag of low Pb, Zn content：Pb
1.21wt%, Zn 2.34wt%, S 0.89wt%, CaO 3.22wt%, MgO 1.23wt%, SiO214.03wt%, by height
The slag of the slag of Pb, Zn content and low Pb, Zn content is carried out with reducing agent, additive and binding agent according to following weight proportion respectively
Dispensing, respectively obtains high Pb, Zn content mixture and low Pb, Zn content mixture.Wherein, the slag of high Pb, Zn content: coal dust: lime
: waterglass=100: 23: 20: 8, the slag of low Pb, Zn content: coke: magnesium sulfate: sodium humate=100: 18: 2: 3, by high lead zinc
Content mixture and low Pb, Zn content mixture put into progress balling-up processing in molding machine respectively, respectively obtain high Pb, Zn content
Pelletizing and low lead cadmia content pelletizing.The ternary basicity of high Pb, Zn content pelletizing is 2.0, the ternary basicity of low Pb, Zn content pelletizing
For 0.77.Low Pb, Zn content pelletizing is arranged in the lower layer mix feeding area of rotary furnace bottom, fabric thickness 50mm, by high Pb, Zn content
Pelletizing is arranged on low Pb, Zn content pelletizing, fabric thickness 80mm.Rotary hearth furnace reduction temperature is 1380 DEG C, and the recovery time is
20min.The degree of metalization of high Pb, Zn content pelletizing and low Pb, Zn content pelletizing is respectively 92.65% and 90.12%, and high lead zinc contains
It is 95.07% to measure lead removal efficiency in pelletizing, and zinc extrusion rate is 99.39%, and silver-colored extrusion rate is 86.97%.Low Pb, Zn content pelletizing
Middle lead extrusion rate is 92.41%, and zinc extrusion rate is 97.96%.Obtained metallized pellet obtains quality point by mill ore magnetic selection
Number is 90.88% full iron, and iron recovery is 89.60% metal iron powder, and productivity is improved compared with the individual layer cloth of the prior art
More than 40%.
The method of the present invention is easy to operate, feasible, can effectively improve the ability of rotary hearth furnace processing lead cadmia, be carried in productivity
Ensure the volatility of the valuable metal such as lead, zinc, silver in pelletizing, and the gold of upper and lower bed of cloth pelletizing in the case of high more than 30%
Belonging to rate will not reduce because the bed of material thickens.
Embodiment 7
Contain in the slag of high Pb, Zn content：Pb 3.36wt%, Zn 15.52wt%, Ag 0.015wt%, S
5.50wt%, CaO 3.22wt%, MgO 1.23wt%, SiO214.03wt%, contains in the slag of low Pb, Zn content：Pb
1.21wt%, Zn 2.34wt%, S 0.89wt%, CaO 3.22wt%, MgO 1.23wt%, SiO214.03wt%, by height
The slag of the slag of Pb, Zn content and low Pb, Zn content is carried out with reducing agent, additive and binding agent according to following weight proportion respectively
Dispensing, respectively obtains high Pb, Zn content mixture and low Pb, Zn content mixture.Wherein, the slag of high Pb, Zn content: coal dust: magnesite
Ore deposit: waterglass=100: 15: 16: 8, the slag of low Pb, Zn content: coke: magnesium sulfate: sodium humate=100: 15: 7: 4, by high lead
Zn content mixture and low Pb, Zn content mixture put into progress balling-up processing in molding machine respectively, respectively obtain high lead zinc and contain
Measure pelletizing and low Pb, Zn content pelletizing.The ternary basicity of high Pb, Zn content pelletizing is 1.14, the ternary alkali of low Pb, Zn content pelletizing
Spend for 0.77.Low Pb, Zn content pelletizing is arranged in the lower layer mix feeding area of rotary furnace bottom, fabric thickness 45mm, by high lead zinc
Content pelletizing is arranged on low Pb, Zn content pelletizing, fabric thickness 60mm.Rotary hearth furnace reduction temperature is 1270 DEG C, the recovery time
55min.The degree of metalization of high Pb, Zn content pelletizing and low Pb, Zn content pelletizing is respectively 92.06% and 88.99%, and high lead zinc contains
It is 95.92% to measure lead removal efficiency in pelletizing, and zinc extrusion rate is 99.34%, and silver-colored extrusion rate is 85.69%.Low Pb, Zn content pelletizing
Middle lead extrusion rate is 92.33%, and zinc extrusion rate is 97.51%.Obtained metallized pellet obtains quality point by mill ore magnetic selection
The full iron for 90.55%, the metal iron powder of iron recovery 89.99% are counted, productivity is improved compared with the individual layer cloth of the prior art
More than 40%.
The method of the present invention is easy to operate, feasible, can effectively improve the ability of rotary hearth furnace processing lead cadmia, be carried in productivity
Ensure the volatility of the valuable metal such as lead, zinc, silver in pelletizing, and the gold of upper and lower bed of cloth pelletizing in the case of high more than 30%
Belonging to rate will not reduce because the bed of material thickens.
Embodiment 8
Contain in the slag of high lead cadmia content：Pb 3.36wt%, Zn 15.52wt%, Ag 0.015wt%, S
5.50wt%, CaO 3.22wt%, MgO 1.23wt%, SiO214.03wt%, contains in the slag of low Pb, Zn content：Pb
1.21wt%, Zn 2.34wt%, S 0.89wt%, CaO 3.22wt%, MgO 1.23wt%, SiO214.03wt%, by height
The slag of the slag of Pb, Zn content and low Pb, Zn content is carried out with reducing agent, additive and binding agent according to following weight proportion respectively
Dispensing, respectively obtains high Pb, Zn content mixture and low Pb, Zn content mixture.Wherein, the slag of high Pb, Zn content: semi-coke: lime
: waterglass=100: 12: 9: 6, the slag of low Pb, Zn content: coke: magnesium sulfate: sodium humate=100: 16: 11: 1.5, by high lead
Zn content mixture and low Pb, Zn content mixture put into progress balling-up processing in molding machine respectively, respectively obtain high lead zinc and contain
Measure pelletizing and low lead cadmia content pelletizing.The ternary basicity of high Pb, Zn content pelletizing is 1.09, the ternary of low Pb, Zn content pelletizing
Basicity is 0.77.Low Pb, Zn content pelletizing is arranged in the lower layer mix feeding area of rotary furnace bottom, fabric thickness 45mm, by high lead zinc
Content pelletizing is arranged on low Pb, Zn content pelletizing, fabric thickness 65mm.Rotary hearth furnace reduction temperature is 1370 DEG C, and the recovery time is
40min.The degree of metalization of high Pb, Zn content pelletizing and low Pb, Zn content pelletizing is respectively 92.75% and 90.92%, and high lead zinc contains
It is 95.47% to measure lead removal efficiency in pelletizing, and zinc extrusion rate is 99.29%, and silver-colored extrusion rate is 86.77%.Low Pb, Zn content pelletizing
Middle lead extrusion rate is 92.61%, and zinc extrusion rate is 97.86%.Obtained metallized pellet obtains quality point by mill ore magnetic selection
Number is 91.28% full iron, and iron recovery is 89.79% metal iron powder, and productivity is improved compared with the individual layer cloth of the prior art
More than 40%.
The method of the present invention is easy to operate, feasible, can effectively improve the ability of rotary hearth furnace processing lead cadmia, be carried in productivity
Ensure the volatility of the valuable metal such as lead, zinc, silver in pelletizing, and the gold of upper and lower bed of cloth pelletizing in the case of high more than 30%
Belonging to rate will not reduce because the bed of material thickens.
Embodiment described above only expresses embodiments of the present invention, its description is more specific and detailed, but can not
Therefore it is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for those of ordinary skill in the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection model of the present invention
Enclose.
Claims (10)
1. a kind of processing method of lead cadmia, it is characterised in that comprise the following steps：
(1) dispensing mixes：The slag of high Pb, Zn content, the first reducing agent, the first additive and first binder are mixed, obtain height
Pb, Zn content mixture；The slag of low Pb, Zn content, the second reducing agent, Second addition and the second binding agent are mixed, obtained low
Pb, Zn content mixture；
(2) it is molded：By the high Pb, Zn content mixture and the low Pb, Zn content mixture put into respectively in molding machine into
Row balling-up is handled, and respectively obtains high Pb, Zn content pelletizing and low Pb, Zn content pelletizing；
(3) reduction roasting：By in the high Pb, Zn content pelletizing and low Pb, Zn content pelletizing input reduction roasting device into
Row reduction, obtains metallized pellet, lead metal and zinc metal.
2. according to the method described in claim 1, it is characterized in that, the reduction roasting device is rotary hearth furnace, along away from institute
The direction for stating the cloth tray of rotary hearth furnace sequentially forms the first cloth area and the second cloth area, and the first cloth area arrangement is described low
Pb, Zn content pelletizing, the second cloth area arrange the high Pb, Zn content pelletizing.
3. according to the method described in claim 2, it is characterized in that, two cloth material mouths are set, to described low on the rotary hearth furnace
Pb, Zn content pelletizing and the high Pb, Zn content pelletizing difference cloth, and the low Pb, Zn content pelletizing cloth is in lower floor, institute
High Pb, Zn content pelletizing cloth is stated on upper strata.
4. according to the method described in claim 3, it is characterized in that, the fabric thickness of the high Pb, Zn content pelletizing is 40-
80mm, the fabric thickness of the low Pb, Zn content pelletizing is 30-50mm.
5. according to the method described in claim 1, it is characterized in that, lead, zinc and sulphur in the slag of the high Pb, Zn content contains
Measure summation ＞ 10wt%；The content summation ＜ 10wt% of lead, zinc and sulphur in the slag of the low Pb, Zn content.
6. according to the method described in claim 1, it is characterized in that,
Weight ratio between the slag of the high Pb, Zn content, the first reducing agent, the first additive and first binder is 100: (8-
25)∶(1-20)∶(0.1-10)；
Weight ratio between the slag of the low Pb, Zn content, the second reducing agent, Second addition and the second binding agent is 100: (8-
25)∶(1-15)∶(0.1-5)。
7. according to the method described in claim 1, it is characterized in that, the first additive is dolomite, lime stone, silica, magnesite
One or more in ore deposit, silica, lime.
8. according to the method described in claim 1, it is characterized in that, Second addition is lime stone, sodium carbonate, sodium sulphate, sulphur
One or more in sour magnesium.
9. according to the method described in claim 1, it is characterized in that, the ternary basicity of the high Pb, Zn content pelletizing is：(CaO+
MgO)/SiO2≤0.25；Or (CaO+MgO)/SiO2≥2.0；Or 1≤(CaO+MgO)/SiO2≤1.3。
10. according to the method described in claim 1, it is characterized in that, the temperature of reduction roasting is 1220-1400 DEG C, reduction roasts
The time of burning is 20-60min.
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| CN110788113A (en) * | 2019-10-17 | 2020-02-14 | 宝武集团环境资源科技有限公司 | Method for inhibiting zinc-containing dust pellets from reduction degradation in rotary hearth furnace |
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