CN101831520B - Method for producing sponge iron co-production with sodium aluminate solution by using Bayer process red mud - Google Patents

Method for producing sponge iron co-production with sodium aluminate solution by using Bayer process red mud Download PDF

Info

Publication number
CN101831520B
CN101831520B CN2010101970045A CN201010197004A CN101831520B CN 101831520 B CN101831520 B CN 101831520B CN 2010101970045 A CN2010101970045 A CN 2010101970045A CN 201010197004 A CN201010197004 A CN 201010197004A CN 101831520 B CN101831520 B CN 101831520B
Authority
CN
China
Prior art keywords
red mud
bayer
magnetic
production
sodium aluminate
Prior art date
Application number
CN2010101970045A
Other languages
Chinese (zh)
Other versions
CN101831520A (en
Inventor
高建阳
李文成
鹿中科
周晓燕
陈玉海
张爱民
郑霞
Original Assignee
中国铝业股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中国铝业股份有限公司 filed Critical 中国铝业股份有限公司
Priority to CN2010101970045A priority Critical patent/CN101831520B/en
Publication of CN101831520A publication Critical patent/CN101831520A/en
Application granted granted Critical
Publication of CN101831520B publication Critical patent/CN101831520B/en

Links

Abstract

The invention relates to a method for producing sponge iron co-production sodium aluminate solution by using Bayer process red mud. The method comprises the following steps of: washing the Bayer process red mud, and then drying and crushing the washed Bayer process red mud; mixing the crushed Bayer process red mud with a first type auxiliary agent, a second type auxiliary agent and a catalytic auxiliary agent so as to prepare a mixed green stock; sintering the mixed green stock to prepare a high-temperature sintered clinker; performing dry magnetic separation on the high-temperature sintered clinker, and then grinding the high-temperature sintered clinker to obtain a magnetic material and a first type non-magnetic material; performing dissolution reaction on the magnetic material and a carbon content mother liquor which is obtained by decomposing the sodium aluminate solution in an alumina refinery to obtain the sodium aluminate solution and a ferruginous filter cake; and performing wet magnetic separation on the ferruginous filter cake to obtain a magnetic sponge iron and a second type non-magnetic material. The method for producing the sponge iron co-production sodium aluminate solution by using the Bayer process red mud uses waste materials generated in an alumina production process, changes the waste materials into valuable, and reduces pollutions to the environment because of the deposition of the red mud.

Description

A kind of method of utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution
Technical field
The present invention relates to a kind of method of production sponge iron co-production sodium aluminate solution, relate in particular to a kind of method of utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution.
Background technology
Red mud is to refine the waste that produces in the alumina process with bauxite, because of it is gained the name for crimson look muddy.Along with the continuous development of aluminium industry, at present the whole world is annual produces about 6,000 ten thousand tons of red muds, and be more than 4,500,000 tons red mud quantity discharged every year of China.The most of alumina producers in countries in the world are that red mud is piled up or the impouring deep-sea, depositing of red mud not only takies a large amount of soils and farmland, expends more stockyard construction and maintenance cost, and be present in residue alkali lye in the red mud to underground infiltration, cause groundwater pollution.In addition, the dust that the red mud in stockyard forms flies upward everywhere, and broken ring ecotope causes severe contamination.The current society of be becoming tight in land resources day, environment protection is increasingly important, one of focus that the comprehensive regulation of red mud has become people to be paid close attention to.
Red mud is according to the difference of alumina-producing method, can be divided into three kinds of sintering process, Bayer process and integrated processs, what Bayer process was produced processing is boehmite type and gibbsitic bauxite, adopt highly basic NaOH stripping high alumina, high-iron bauxite, aluminum oxide, ferric oxide, alkali content height in the red mud of generation.What sintering process and integrated process were handled is the high silicon of indissoluble, low iron, diaspore type, kaolinite type bauxite, the red mud CaO content height of generation, and alkali and iron level are lower.China mainly is the sintering process and the integrated process of producing aluminum oxide with diaspore type bauxite, and the main component of red mud from sintering process that obtains and integrated process red mud is Dicalcium Phosphate (Feed Grade) and hydrate thereof; Abroad then based on Bayer process, the main component of Bayer process red mud is rhombohedral iron ore, sodium aluminium silicate hydrate, cancrinite etc.
Aspect the recovery of the rich amount metal of red mud, India Bharat Chinalco utilizes the Bayer process red mud of our company to reclaim TiO 2, its concrete technological process is: a certain amount of red mud is mixed stirring with the tap water of twice, carry out sedimentation by flocculation agent, afterwards with washed red mud and HCl deferred reaction, until the mud neutralization, adjusting the pH value in the time of 90 ℃~95 ℃ is 4; Use the flocculation agent sedimentation again, dry settled red mud continues to handle with dense HCl under the condition of heating, becomes grey through reaction mud, and washing makes mud and solution separating, and be with SiO this moment in the mud 2And TiO 2Be main, the mud to heat adopts H again 2SO 4Method is extracted titanium oxide, and Re the vitriol oil makes titanium dioxide be converted into its vitriol like this, and the sulphuric acid soln that afterwards gained is contained titanium sulfate is hydrolyzed, and obtains the metatitanic acid precipitation of white.Use this method can be easy to reclaim TiO 2, and all recirculation of used acid in the removal process, the waste residue that obtains thereafter also can be used for the production of sponge iron.
There is the series process of employing to handle Bayer process red mud at present, promptly adopt soda-lime sintering process to handle to Bayer process red mud, obtain sodium aluminate solution and red mud from sintering process after the processing, but, the technical process complexity of whole production, the cost height, the outer discharge capacity of red mud strengthens on the contrary, bayer's process system and sintering process system check and balance, exist mass flow under certain technical indicator condition and the overall equilbrium problem between the capacity of equipment, the improper situation of a certain operation can feed through to other concerned process steps even whole process of production rapidly, makes bayer's process system and sintering process system all can not bring into play throughput separately to greatest extent.
Summary of the invention
The present invention is directed to the technical process complexity that adopts series process to handle Bayer process red mud is arranged at present, the cost height, the outer discharge capacity of red mud strengthens on the contrary, bayer's process system and sintering process system check and balance, all can not bring into play the deficiency of throughput separately to greatest extent, a kind of method of utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution is provided.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of method of Bayer process red mud production sponge iron co-production sodium aluminate solution of utilizing may further comprise the steps:
Step 10: will Bayer process red mud dry after the washing and broken, make the granularity of the Bayer process red mud after the fragmentation be controlled at 20 microns~100 microns;
Step 20: the Bayer process red mud after the fragmentation and first kind auxiliary agent, second analog assistant and catalyst aid are carried out mix make the compound raw material;
Step 30: the compound raw material were carried out sintering 0.5 hour~3 hours under 900 ℃~1400 ℃, make the high temperature sintering grog;
Step 40: the high temperature sintering grog is carried out after dry type magnetic separation handles, and grind and obtain magnetic material and first kind non-magnetic material;
Step 50: magnetic material after will grinding and the resulting carbon mother liquid of alumina producer decomposition sodium aluminate liquid carry out the stripping reaction after 0.2 hour~0.8 hour under 50 ℃~90 ℃, obtain sodium aluminate solution and iron cake through solid-liquid separation;
Step 60: iron cake is carried out obtaining the magnetic sponge iron and the second class non-magnetic material after wet magnetic separation handles.
The invention has the beneficial effects as follows: the present invention utilizes the method for Bayer process red mud production sponge iron co-production sodium aluminate solution to utilize the waste that produces in the aluminum oxide production process, turns waste into wealth, and has reduced manufacturing cost of aluminum oxide, has promoted the throughput of aluminum oxide; Adopt and add catalyst aid, the way of adjuvant for combustion is handled Bayer process red mud, has realized the comprehensive utilization of ferro element in the red mud, and has realized effective separation; Technical parameter in the production method is controlled easily, and the ferro element effective rate of utilization can reach more than 90%, and promptly the ratio that the total amount of ferro element accounts for ferro element total amount in the parent red mud in the sponge iron of Huo Deing can reach more than 90%, obtains sodium aluminate solution simultaneously; Reduced because of red mud and deposited pollution to environment, the protection environment has extended industrial chain, has reduced the alumina producing link, has realized the serialization operation, is convenient to carry out large industrialized production; Make sintering system realize energy-conservation significantly and consumption reduction, help bringing into play to greatest extent the throughput of sintering process and Bayer process two big systems, the optimization production flow process.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the first kind auxiliary agent in the described step 20 comprises one or several in graphite, coke, hard coal, brown coal and the first kind non-magnetic material.
Further, the add-on of described first kind auxiliary agent restores into 1.1 times~1.8 times of the required theoretical carbon amount of fe for after the full weight of iron percentage composition in the Bayer process red mud after the fragmentation is converted to ferric oxide.
Further, described first kind auxiliary agent comprises that by its weight percent meter 20%~30% granularity is the first kind auxiliary agent that 1 millimeter~5 millimeters first kind auxiliary agent and 70%~80% granularity are 20 microns~200 microns.
Further, the carbon content of described first kind non-magnetic material is greater than 30%.
Further, second analog assistant in the described step 20 comprises sodium hydroxide, yellow soda ash, potassium hydroxide, salt of wormwood, one or several in calcium hydroxide, lime carbonate, calcium oxide, magnesium hydroxide, magnesiumcarbonate, rhombspar and the ironic hydroxide.
Further, the add-on of described second analog assistant be after the fragmentation Bayer process red mud weight 5%~100%.
Further, catalyst aid comprises in wood chip, chaff powder and the straw powder one or several in the described step 20.
Further, the add-on of described catalyst aid be after the fragmentation Bayer process red mud weight 0.1%~0.5%, its granularity is controlled at 10 microns~80 microns.
Further, described step 20 comprises following process:
Step 201: after the first kind auxiliary agent of the Bayer process red mud after the fragmentation, second analog assistant, catalyst aid and 40%~80% mixed, in mixture, add entry as tackiness agent, with the mixture extrusion molding, the granularity of mixture is controlled at 0.5 millimeter~8 millimeters after the moulding again;
Step 202: the first kind auxiliary agent of the mixture after the moulding and 20%~60% is carried out promptly can be made into the compound raw material after secondary mixes.
Further, carry out the equipment that high temperature sintering uses in the described step 30 and be rotary kiln, shaft furnace or tunnel furnace.
Further, in the described step 30 the compound raw material are carried out sintering 1 hour~2 hours under 1000 ℃~1300 ℃, make the high temperature sintering grog.
Further, the magneticstrength of dry type magnetic separation is 100 Gausses~1000 Gausses in the described step 40.
Further, the granularity of the magnetic material that obtains after the grinding in the described step 40 is controlled at 20 microns~100 microns.
Further, the carbon content of grinding the first kind non-magnetic material obtain in the described step 40 was less than or equal to 30% o'clock, then mixed being directly used in production cement with the second class non-magnetic material that obtains in the step 60.
Further, the mass ratio of magnetic material and the resulting carbon mother liquid of alumina producer decomposition sodium aluminate liquid is 1: 10~1: 3 in the described step 50.
Further, the magneticstrength of wet magnetic separation is 100 Gausses~600 Gausses in the described step 60.
Description of drawings
Fig. 1 utilizes the schematic flow sheet of the method for Bayer process red mud production sponge iron co-production sodium aluminate solution for the present invention.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and feature are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
Fig. 1 utilizes the schematic flow sheet of the method for Bayer process red mud production sponge iron co-production sodium aluminate solution for the present invention.As shown in Figure 1, said method comprising the steps of:
Step 10: will Bayer process red mud dry after the washing and broken, make the granularity of the Bayer process red mud after the fragmentation be controlled at 20 microns~100 microns.
Full weight of iron content is greater than 20% in the described Bayer process red mud, and preferably, full weight of iron content is greater than 25% in the Bayer process red mud.In addition, the granularity of the Bayer process red mud after the fragmentation preferably is controlled at 40 microns~70 microns.0.7 times of the quality percentage composition of ferric oxide full weight of iron percentage composition that is in the Bayer process red mud in the described Bayer process red mud.
Step 20: the Bayer process red mud after the fragmentation and first kind auxiliary agent, second analog assistant and catalyst aid are carried out mix make the compound raw material.
Described first kind auxiliary agent comprises graphite, coke, hard coal, brown coal and returns in the sintered material one or several.The add-on of described first kind auxiliary agent is for becoming ferric ion Restore All in the Bayer process red mud after the fragmentation 1.1 times~1.8 times of the required theoretical carbon amount of ferrous ion.Described first kind auxiliary agent comprises that by its weight percent meter 20%~30% granularity is the first kind auxiliary agent that 1 millimeter~5 millimeters first kind auxiliary agent and 70%~80% granularity are 20 microns~200 microns.The described sintered material that returns is the first kind non-magnetic material of making in the subsequent step 40, and the main component of described first kind non-magnetic material is unreacted carbon residue, nonmagnetic gangue, the non-iron that magneticly elects etc.
Described second analog assistant comprises sodium hydroxide, yellow soda ash, potassium hydroxide, salt of wormwood, in calcium hydroxide, lime carbonate, calcium oxide, magnesium hydroxide, magnesiumcarbonate, rhombspar and the ironic hydroxide one or several, preferably, second analog assistant comprises one or several in sodium hydroxide, yellow soda ash, calcium hydroxide and the lime carbonate.The add-on of described second analog assistant be after the fragmentation Bayer process red mud weight 5%~100%, concrete add-on is that the composition according to red mud calculates.
Described catalyst aid comprises one or several in wood chip, chaff powder and the straw powder.The add-on of described catalyst aid be after the fragmentation Bayer process red mud weight 0.1%~0.5%, its granularity is controlled at 10 microns~80 microns.
Described step 20 comprises following process:
Step 201: after the first kind auxiliary agent of the Bayer process red mud after the fragmentation, second analog assistant, catalyst aid and 40%~80% mixed, in mixture, add entry as tackiness agent, with the mixture extrusion molding, the granularity of mixture is controlled at 0.5 millimeter~8 millimeters after the moulding again.
It is block or spherical etc. that mixture after the extrusion molding is generally, and preferably, the mixture after the extrusion molding is spherical.
Step 202: the first kind auxiliary agent of the mixture after the moulding and 20%~60% is carried out promptly can be made into the compound raw material after secondary mixes.
In the described step 20 Bayer process red mud after the fragmentation and first kind auxiliary agent, second analog assistant and catalyst aid are carried out the process that mix is made the compound raw material, why being divided into two steps of step 201 and step 202 successively carries out, be because if directly with Bayer process red mud and first kind auxiliary agent, second analog assistant and catalyst aid blended words, it is thorough to cause ferrous components in the Bayer process red mud to reduce in follow-up step, and the effective rate of utilization of ferro element is not high yet; And will be according to the chemical composition (iron level) of concrete different red muds, first kind auxiliary agent is added at twice, can create better reducing atmosphere, the ferrous components that helps in the Bayer process red mud reduces in follow-up step thoroughly, thereby improves the effective rate of utilization of ferro element.
Step 30: the compound raw material were carried out sintering 0.5 hour~3 hours under 900 ℃~1400 ℃, make the high temperature sintering grog.
Carry out high temperature sintering in this step and can select rotary kiln, shaft furnace, tunnel furnace etc., preferably, select tunnel furnace.Preferably, the compound raw material were carried out sintering 1 hour~2 hours under 1000 ℃~1300 ℃.
Step 40: the high temperature sintering grog is carried out after dry type magnetic separation handles, and grind and obtain magnetic material and first kind non-magnetic material.
The magneticstrength of described dry type magnetic separation is 100 Gausses~1000 Gausses.If carbon content is greater than 30% in the first kind non-magnetic material that obtains, then can return and be used to dispose first kind auxiliary agent, otherwise mix with the second class non-magnetic material that subsequent step obtains, be directly used in Cement Production.The magnetic material that obtains in this step need carry out ore grinding to be handled, and the granularity of the magnetic material after the control ore grinding is handled is 20 microns~100 microns, then carry out step 50.
Step 50: magnetic material after will grinding and the resulting carbon mother liquid of alumina producer decomposition sodium aluminate liquid carry out the stripping reaction after 0.2 hour~0.8 hour under 50 ℃~90 ℃, obtain sodium aluminate solution and iron cake through solid-liquid separation.
The mass ratio of described magnetic material and the resulting carbon mother liquid of alumina producer decomposition sodium aluminate liquid is 1: 10~1: 3.The main component of described carbon mother liquid comprises N T: 60g/L~130g/L, AO:5g/L~20g/L, Nc:60g/L~140g/L.Described magnetic material is the magnetic material after handling through ore grinding, and its granularity is 20 microns~100 microns.Carry out solid-liquid separation after the stripping reaction finishes, can obtain sodium aluminate solution and iron cake, sodium aluminate solution is delivered to alumina producer utilization.
Step 60: iron cake is carried out obtaining the magnetic sponge iron and the second class non-magnetic material after wet magnetic separation handles.
The magneticstrength of described wet magnetic separation is 100 Gausses~600 Gausses.The second class non-magnetic material that obtains in this step can mix back direct production cement with above-mentioned first kind non-magnetic material.
Utilize the method for Bayer process red mud production sponge iron co-production sodium aluminate solution to do further detailed description to the present invention below.
Embodiment one:
In the present embodiment, Fe in the described Bayer process red mud 2O 3Mass content be 28%, may further comprise the steps:
(1) will Bayer process red mud dry after the washing and broken, making the granularity of the Bayer process red mud after the fragmentation is 30 microns;
(2) Bayer process red mud after the fragmentation and first kind auxiliary agent, second analog assistant and catalyst aid are carried out mix and make the compound raw material,
Wherein, first kind auxiliary agent is coke, hard coal, brown coal and returns sintered material (mass ratio of four kinds of materials is 3: 2: 2: mixture 3), comprise that by its weight percent meter 70% granularity is the first kind auxiliary agent that 20 microns first kind auxiliary agent and 30% granularity are 5 microns, the add-on of first kind auxiliary agent is 1.8 times of theoretical mixed carbon comtent that will need behind the ferric oxide Restore All in the Bayer process red mud
Second analog assistant be yellow soda ash, calcium hydroxide, lime carbonate and rhombspar mixture (mass ratio of four kinds of materials is 3: 4: 2: 1), the add-on of second analog assistant is 5% of a Bayer process red mud weight,
Catalyst aid is a wood chip, and granularity is 10 microns, and add-on is 0.1% of a Bayer process red mud weight,
Step (2) comprises following process:
At first, after the first kind auxiliary agent of Bayer process red mud, second analog assistant, catalyst aid and 40% mixed, be tackiness agent with water, be squeezed into block standbyly, granularity is 0.5 millimeter,
Then, with 60% first kind auxiliary agent be squeezed into blocky molding mass and carry out secondary and mix and form the compound raw material;
(3) the compound raw material are carried out sintering 1 hour under 1000 ℃ in rotary kiln, make the high temperature sintering grog;
(4) be to carry out under 100 Gausses' the magnetic field after dry type magnetic separation handles the high temperature sintering grog in magneticstrength, and grind and obtain magnetic material and first kind non-magnetic material, the carbon content of the first kind non-magnetic material that obtains is 38%, be used to return configuration carbon class reductive agent, and the magnetic material that obtains is carried out ore grinding handle, the magnetic material granularity after ore grinding is handled is 20 microns;
(5) with magnetic material and the resulting carbon mother liquid of alumina producer decomposition sodium aluminate liquid with mass ratio 1: 3, under 50 ℃, carry out stripping reaction 0.8 hour, obtain sodium aluminate solution and iron cake, sodium aluminate solution send the alumina producer utilization;
(6) be to carry out under 100 Gausses' the magnetic field after wet magnetic separation handles iron cake in magneticstrength, obtain the magnetic sponge iron and the second class non-magnetic material, the grade of sponge iron is that full iron amount Tfe is 92, the effective rate of utilization of present embodiment ferro element reaches 91%, the second class non-magnetic material and is directly used in production cement.
Embodiment two:
In the present embodiment, Fe in the described Bayer process red mud 2O 3Mass content be 38%, may further comprise the steps:
(1) will Bayer process red mud dry after the washing and broken, making the granularity of the Bayer process red mud after the fragmentation is 70 microns;
(2) Bayer process red mud after the fragmentation and first kind auxiliary agent, second analog assistant and catalyst aid are carried out mix and make the compound raw material,
Wherein, first kind auxiliary agent is graphite, coke and anthracitic mixture (mass ratio of three kinds of materials is 4: 2: 4), comprise that by its weight percent meter 80% granularity is the first kind auxiliary agent that 100 microns first kind auxiliary agent and 20% granularity are 3 microns, the add-on of first kind auxiliary agent is 1.1 times of theoretical mixed carbon comtent that will need behind the ferric oxide Restore All in the Bayer process red mud
Second analog assistant is a sodium hydroxide, yellow soda ash, and the mixture of lime carbonate, magnesium hydroxide and ironic hydroxide (mass ratio of five kinds of materials is 2: 1: 4: 2: 1), the add-on of second analog assistant is 100% of a Bayer process red mud weight,
Catalyst aid is a chaff powder, and granularity is 80 microns, and add-on is 0.5% of a Bayer process red mud weight,
Step (2) comprises following process:
At first, after the first kind auxiliary agent of Bayer process red mud, second analog assistant, catalyst aid and 80% mixed, be tackiness agent with water, ball up is standby, and diameter is 4 millimeters,
Then, the molding mass of 20% first kind auxiliary agent and ball up being carried out secondary mixes and forms the compound raw material;
(3) the compound raw material are carried out sintering 3 hours under 1300 ℃ in rotary kiln, make the high temperature sintering grog;
(4) be to carry out under 1000 Gausses' the magnetic field after dry type magnetic separation handles the high temperature sintering grog in magneticstrength, and grind and obtain magnetic material and first kind non-magnetic material, the carbon content of the first kind non-magnetic material that obtains is 12%, be used to produce cement, and the magnetic material that obtains is carried out ore grinding handle, the magnetic material granularity after ore grinding is handled is 100 microns;
(5) with magnetic material and the resulting carbon mother liquid of alumina producer decomposition sodium aluminate liquid with mass ratio 1: 10, under 90 ℃, carry out stripping reaction 0.2 hour, obtain sodium aluminate solution and iron cake, sodium aluminate solution send the alumina producer utilization;
(6) be to carry out under 600 Gausses' the magnetic field after wet magnetic separation handles iron cake in magneticstrength, obtain the magnetic sponge iron and the second class non-magnetic material, the grade of sponge iron is that full iron amount Tfe is 93, the effective rate of utilization of present embodiment ferro element is directly used in production cement after reaching 92.3%, the second class non-magnetic material and the mixing of first kind non-magnetic material.
Embodiment three:
In the present embodiment, Fe in the described Bayer process red mud 2O 3Mass content be 58%, may further comprise the steps:
(1) will Bayer process red mud dry after the washing and broken, making the granularity of the Bayer process red mud after the fragmentation is 40 microns;
(2) Bayer process red mud after the fragmentation and first kind auxiliary agent, second analog assistant and catalyst aid are carried out mix and make the compound raw material,
Wherein, first kind auxiliary agent is graphite, brown coal and the mixture that returns sintered material (mass ratio of three kinds of materials is 3: 5: 2), comprise that by its weight percent meter 75% granularity is the first kind auxiliary agent that 60 microns first kind auxiliary agent and 25% granularity are 2 microns, the add-on of first kind auxiliary agent is 1.6 times of theoretical mixed carbon comtent that will need behind the ferric oxide Restore All in the Bayer process red mud
Second analog assistant is a potassium hydroxide, salt of wormwood, the mixture of calcium hydroxide and lime carbonate (mass ratio of four kinds of materials is 2: 1: 4: 3), the add-on of second analog assistant is 30% of a Bayer process red mud weight,
Catalyst aid is a straw powder, and granularity is 50 microns, and add-on is 0.3% of a Bayer process red mud weight,
Step (2) comprises following process:
At first, after the first kind auxiliary agent of Bayer process red mud, second analog assistant, catalyst aid and 60% mixed, be tackiness agent with water, ball up is standby, and its diameter is 3 millimeters,
Then, with 40% first kind auxiliary agent be squeezed into blocky molding mass and carry out secondary and mix and form the compound raw material;
(3) the compound raw material are carried out sintering 2 hours under 1100 ℃ in rotary kiln, make the high temperature sintering grog;
(4) be to carry out under 600 Gausses' the magnetic field after dry type magnetic separation handles the high temperature sintering grog in magneticstrength, and grind and obtain magnetic material and first kind non-magnetic material, the carbon content of the first kind non-magnetic material that obtains is 38%, be used to return configuration carbon class reductive agent, and the magnetic material that obtains is carried out ore grinding handle, the magnetic material granularity after ore grinding is handled is 60 microns;
(5) with magnetic material and the resulting carbon mother liquid of alumina producer decomposition sodium aluminate liquid with mass ratio 1: 6, under 70 ℃, carry out stripping reaction 0.5 hour, obtain sodium aluminate solution and iron cake, sodium aluminate solution send the alumina producer utilization;
(6) be to carry out under 300 Gausses' the magnetic field after wet magnetic separation handles iron cake in magneticstrength, obtain the magnetic sponge iron and the second class non-magnetic material, the grade of sponge iron is that full iron amount Tfe is 91.5, the effective rate of utilization of ferro element is directly used in production cement after reaching 90.8%, the second class non-magnetic material and the mixing of first kind non-magnetic material in the present embodiment.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (14)

1. a method of utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution is characterized in that, said method comprising the steps of:
Step 10: will Bayer process red mud dry after the washing and broken, make the granularity of the Bayer process red mud after the fragmentation be controlled at 20 microns~100 microns;
Step 20: with Bayer process red mud after the fragmentation and first kind auxiliary agent, second analog assistant and catalyst aid carry out mix and make the compound raw material, described first kind auxiliary agent comprises graphite, coke, hard coal, in brown coal and the first kind non-magnetic material one or several, described second analog assistant comprises sodium hydroxide, yellow soda ash, potassium hydroxide, salt of wormwood, calcium hydroxide, lime carbonate, calcium oxide, magnesium hydroxide, magnesiumcarbonate, in rhombspar and the ironic hydroxide one or several, described catalyst aid comprises wood chip, in chaff powder and the straw powder one or several;
Step 30: the compound raw material were carried out sintering 0.5 hour~3 hours under 900 ℃~1400 ℃, make the high temperature sintering grog;
Step 40: the high temperature sintering grog is carried out after dry type magnetic separation handles, and grind and obtain magnetic material and first kind non-magnetic material;
Step 50: magnetic material after will grinding and the resulting carbon mother liquid of alumina producer decomposition sodium aluminate liquid carry out the stripping reaction after 0.2 hour~0.8 hour under 50 ℃~90 ℃, obtain sodium aluminate solution and iron cake through solid-liquid separation;
Step 60: iron cake is carried out obtaining the magnetic sponge iron and the second class non-magnetic material after wet magnetic separation handles.
2. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1, it is characterized in that, the add-on of described first kind auxiliary agent restores into 1.1 times~1.8 times of the required theoretical carbon amount of fe for after the full weight of iron percentage composition in the Bayer process red mud after the fragmentation is converted to ferric oxide.
3. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1, it is characterized in that described first kind auxiliary agent comprises that by its weight percent meter 20%~30% granularity is the first kind auxiliary agent that 1 millimeter~5 millimeters first kind auxiliary agent and 70%~80% granularity are 20 microns~200 microns.
4. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1 is characterized in that the carbon content of described first kind non-magnetic material is greater than 30%.
5. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1 is characterized in that, the add-on of described second analog assistant be after the fragmentation Bayer process red mud weight 5%~100%.
6. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1, it is characterized in that, the add-on of described catalyst aid be after the fragmentation Bayer process red mud weight 0.1%~0.5%, its granularity is controlled at 10 microns~80 microns.
7. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1 is characterized in that, described step 20 comprises following process:
Step 201: after the first kind auxiliary agent of the Bayer process red mud after the fragmentation, second analog assistant, catalyst aid and 40%~80% mixed, in mixture, add entry as tackiness agent, with the mixture extrusion molding, the granularity of mixture is controlled at 0.5 millimeter~8 millimeters after the moulding again;
Step 202: the first kind auxiliary agent of the mixture after the moulding and 20%~60% is carried out promptly can be made into the compound raw material after secondary mixes.
8. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1 is characterized in that, carries out the equipment that high temperature sintering uses in the described step 30 and is rotary kiln, shaft furnace or tunnel furnace.
9. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1 is characterized in that, in the described step 30 the compound raw material is carried out sintering 1 hour~2 hours under 1000 ℃~1300 ℃, makes the high temperature sintering grog.
10. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1 is characterized in that, the magneticstrength of dry type magnetic separation is 100 Gausses~1000 Gausses in the described step 40.
11. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1 is characterized in that, the granularity of the magnetic material that obtains after grinding in the described step 40 is controlled at 20 microns~100 microns.
12. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1, it is characterized in that, the carbon content of grinding the first kind non-magnetic material obtain in the described step 40 was less than or equal to 30% o'clock, then mixed being directly used in production cement with the second class non-magnetic material that obtains in the step 60.
13. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1, it is characterized in that the mass ratio of magnetic material and the resulting carbon mother liquid of alumina producer decomposition sodium aluminate liquid is 1: 10~1: 3 in the described step 50.
14. the method for utilizing Bayer process red mud production sponge iron co-production sodium aluminate solution according to claim 1 is characterized in that, the magneticstrength of wet magnetic separation is 100 Gausses~600 Gausses in the described step 60.
CN2010101970045A 2010-06-10 2010-06-10 Method for producing sponge iron co-production with sodium aluminate solution by using Bayer process red mud CN101831520B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010101970045A CN101831520B (en) 2010-06-10 2010-06-10 Method for producing sponge iron co-production with sodium aluminate solution by using Bayer process red mud

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010101970045A CN101831520B (en) 2010-06-10 2010-06-10 Method for producing sponge iron co-production with sodium aluminate solution by using Bayer process red mud

Publications (2)

Publication Number Publication Date
CN101831520A CN101831520A (en) 2010-09-15
CN101831520B true CN101831520B (en) 2011-07-20

Family

ID=42715738

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010101970045A CN101831520B (en) 2010-06-10 2010-06-10 Method for producing sponge iron co-production with sodium aluminate solution by using Bayer process red mud

Country Status (1)

Country Link
CN (1) CN101831520B (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102174664A (en) * 2010-11-24 2011-09-07 胡长春 Comprehensive utilization method of red mud coal-base rotary kiln method
CN102500592A (en) * 2011-09-16 2012-06-20 茌平县信发盛吉赤泥处理有限公司 Method for comprehensively utilizing alumina red mud
CN102500596B (en) * 2011-10-20 2013-08-07 安徽理工大学 Red mud harmless comprehensive recycling technology suitable for Bayer process
CN102732662A (en) * 2012-06-02 2012-10-17 胡长春 Slag-free production process using bauxite or red mud
CN103397128B (en) * 2013-08-02 2015-07-15 北京科技大学 Method used for extracting iron from red mud by drastic reduction and method used for preparing gel material from secondary tailings
CN104649305B (en) * 2013-11-21 2016-09-21 神华集团有限责任公司 A kind of method that magnesium oxide roasting carries aluminum
CN104649304B (en) * 2013-11-21 2016-06-15 神华集团有限责任公司 A kind of alkali method is carried aluminium and is obtained dealkalize red mud and the application thereof of the method for dealkalize red mud and acquisition
CN104152717B (en) * 2014-07-21 2015-11-25 中南大学 The composite additive used in metallic tin process and the method preparing metallic tin are prepared in the reducing roasting of a kind of cassiterite concentrate
CN105174295A (en) * 2015-10-15 2015-12-23 北京荣富鑫环保科技有限公司 Dry-process electric-separation governing system for red mud
CN105710105B (en) * 2016-01-13 2018-01-05 河南城建学院 A kind of red mud selects the integral preparation method of iron and its tailings base foamed light walling
CN106119552A (en) * 2016-08-01 2016-11-16 江苏省冶金设计院有限公司 Process the method and system of red mud
CN106755966A (en) * 2017-01-10 2017-05-31 江苏省冶金设计院有限公司 A kind of method that gas-based reduction processes red mud
CN109487075B (en) * 2018-12-18 2020-07-07 清华大学 Method for comprehensively recovering valuable elements in aluminum-based petroleum refining catalyst by utilizing reducing gas
CN109652652B (en) * 2018-12-18 2020-07-07 清华大学 Method for recycling valuable elements from aluminum-based petroleum refining waste catalyst in clean and environment-friendly manner
CN109593965B (en) * 2018-12-18 2020-07-07 清华大学 Method for recovering valuable elements from aluminum-based petroleum refining waste catalyst

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU162284B (en) * 1971-04-17 1973-01-29
CN1405092A (en) * 2002-11-12 2003-03-26 中国铝业股份有限公司 Bayer combination production method for aluminium and calcium aluminate cement
CN101417261B (en) * 2008-11-21 2011-10-26 中国铝业股份有限公司 Bayer process red mud processing method
CN101624654A (en) * 2009-04-17 2010-01-13 华中科技大学 Method for recycling iron and aluminum by particle size grading pretreatment of Bayer process red mud

Also Published As

Publication number Publication date
CN101831520A (en) 2010-09-15

Similar Documents

Publication Publication Date Title
Liu et al. Utilization of red mud in cement production: a review
CN101284668B (en) Process for abstracting earth silicon, oxide of alumina and gallium oxide from high-alumina flying ash
US7871583B2 (en) Process for recovery of silica followed by alumina from coal fly ash
CN104988320B (en) The method and system of valuable metal is reclaimed from red mud
AU2014392419B2 (en) Method for recycling alkali and aluminum during treatment of Bayer red mud by using calcification-carbonization process
CN105776150A (en) Method for cooperative activation of fly ash and decomposition of gypsum for recovery of sulfur resource
CN1283552C (en) Method of preparing election class potassium carbonate using potassium rich rock
Liu et al. Review on treatment and utilization of bauxite residues in China
CN1296280C (en) Method for combination producing alumina and cement from chalk and flyash
Wang et al. Recovery of alkali and alumina from bauxite residue (red mud) and complete reuse of the treated residue
Patel et al. Current status of an industrial waste: red mud an overview
CN104355575B (en) Flyash printing and dyeing sludge geology polymer material and preparation method thereof
CN104445312B (en) A kind of flyash and coal gangue associated treatment extract the method for aluminum oxide
CN104445313B (en) A kind of method of soda acid combined extracting aluminum oxide from flyash
CN101306426B (en) Method for extracting iron washed ore from fly ash or slag
CN102351226B (en) Method for producing aluminum oxide from fly ash
CN101434403A (en) Novel method for processing calx sodica sintered alumina by dry method
CN101306826B (en) Process for extracting metallurgy-level aluminum oxide from fly ash or slag
CN101413054B (en) Technology for comprehensively utilizing high ferro aluminiferous material
CN102344171A (en) New method for resource comprehensive utilization of red mud and fly ash
CN102644093B (en) Aluminous fly-ash chlorination electrolytic process produces the method for metallic aluminium
CN102627305B (en) Method using alkaline process to extract alumina in coal ash
CN100577579C (en) Method for producing water treatment coagulant by using coal gangue
CN101913632A (en) Method for extracting aluminum oxide, monox and ferric oxide from gangue combustion ashes
CN104495899B (en) A kind of carbide slag and flyash work in coordination with the method for recycling

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant