CN105713421B - A kind of red mud processing method - Google Patents

A kind of red mud processing method Download PDF

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Publication number
CN105713421B
CN105713421B CN201610238499.9A CN201610238499A CN105713421B CN 105713421 B CN105713421 B CN 105713421B CN 201610238499 A CN201610238499 A CN 201610238499A CN 105713421 B CN105713421 B CN 105713421B
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red mud
processing
processing method
product
white clay
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CN105713421A (en
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徐峰
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/40—Compounds of aluminium
    • C09C1/407—Aluminium oxides or hydroxides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
    • C09C3/041—Grinding
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/06—Treatment with inorganic compounds

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention discloses a kind of red mud processing method, and fusion is stirred after carbon dust, soda water are added in red mud, carries out iron removaling processing successively, heating, vacuum reaction, finished product is obtained after fine grinding.Red mud performance and its stably after present invention processing, be inert material, will not produce and chemically react with other materials.For product prepared by the inventive method compared with traditional packing material, intensity is higher, has more preferable heat endurance, mobility and ageing resistace, and have certain fire resistance.

Description

A kind of red mud processing method
Technical field
The invention belongs to red mud discarded object to recycle field, is related to a kind of red mud processing method.
Background technology
Red mud is that bauxite produces remaining bronzing after aluminum oxide, powder pureed strong basicity solid waste, is aluminum oxide Essential accessory substance in production process.1 t aluminum oxide is often typically produced, can the t of output red mud 1.0~1.8.With aluminium work The development of industry, at present, the whole world t of caused red mud about 80,000,000 every year.2000, China's red mud discharge capacity was about 4,000,000 T, the red mud of discharge mainly take outdoor stockpiling processing of building a dam.Due to lacking not only economic but also feasible technology, the comprehensive profit of red mud Reduced levels, only 4% or so are constantly in rate, it is average using horizontal far below Chinese industrial solid waste 65%.2007 Year, China's red mud annual emissions reached 30,000,000 t, and 2014 estimated up to 4000 ~ 50,000,000 t, adds up red mud accumulating amount and reaches several hundred million t.Because substantial amounts of red mud is underutilized, a large amount of soils are taken for a long time, cause soil to alkalize, underground water is contaminated, Easily cause " reentrainment of dust " to pollute environment again simultaneously, endanger the health of people.
The chemical composition and physical property of red mud：
1st, chemical composition.For red mud because containing more iron oxide, its appearance color is similar to redness of the skin or complexion soil, thus gains the name.It is red The main mineral constituent of mud is：Dicalcium silicate 53%, sodalite 11%, slaked lime 10%, bloodstone 7.5%, perovskite stone 1l%, manganolite 5%.The chemical composition of red mud depends on the composition of bauxite, produces the method for aluminum oxide and produced The material composition of additive in journey, and composition of newly-generated compound etc., the main component of usual red mud is AI2O3, SiO2, CaO, Na2O etc..
2nd, the physical property index of red mud.It is aqueous that physical property index mainly includes density, void ratio, water content, boundary Measure (plastic limit, liquid limit, plasticity index and liquidity index) and saturation degree etc..
The hydrophysical property of red mud.Hydrophysical property mainly includes permeability, disintegrative and dilatancy, its thing by red mud Differentiation after matter is formed and stacked is restricted.1. water holding, bleed characteristic.Not only water content is big for red mud, and has water retention characteristic, its For water-holding capacity 79.03% one 93.20%, particularly special is that condensate rate is still 5.00%~14.93% when vibration.This meaning Red mud it is vibrated when, its structure can change, its engineering property deteriorate.2. contraction and dilatancy.Red mud although high hole, Gao Han Water, but do not shunk after drying.This explanation High water cut is not result existing for hydrophilic mineral.Meanwhile also without dilatancy.3. collapse Xie Xing.Sample adds distilled water, hardly changes.Sample adds 5% HCI and H2SO4., by 24 h, sample color has Change, and but do not disintegrate with small block disintegration in the form of sheets.Continuity over time, specimen surface have salting out for a large amount of whites, And substantially harden, this is CaCO3, and Na2SiO2The brilliant result with cementation of weight.4. liquefaction potential.The red mud newly accumulated, due to High water cut, its value overwhelming majority are more than liquid limit, in addition powder and aragonite and calcite that sand grains is hydrophobicity.Therefore, new accumulation Red mud have liquefied possibility occurs under vibration.
The dehydration ageing of red mud and intensity.A large number of experiments show that red mud intensity has no inevitable cause and effect with its pilling up time Relation, only relying only on extension pilling up time does not have engineering significance.Strengthen dehydration only while the time is extended, it is strong to be only raising Degree and the prerequisite for improving red mud engineering property.
The content of the invention
Technical problem：Present invention offer one kind is easy to operate, energy consumption is low, will not produce the red mud processing side of secondary pollution Method.
Technical scheme：The red mud processing method of the present invention, comprises the following steps：
1）The impurity in red mud is rejected, fusion is stirred after then adding carbon dust, soda water；
2）Remove the step 1）Leachate in product, iron removaling processing is carried out after drying, obtains semi-finished product white clay；
3）The white clay is loaded into electrical heating vacuum reactor, size is added, in 600 DEG C ~ 800 DEG C, 0.3 ~ 0.4MPa Lower reaction 85 ~ 95 minutes；
4）By the step 3）Product the finished products of 500 ~ 2000 mesh is processed into middling speed superfine mill.
Further, in the inventive method, step 1）The carbon dust of middle addition accounts for red mud mass percent 3 ~ 5%, and soda water accounts for Red mud mass percent 10 ~ 15%, the step 3）In, the mass ratio of white clay and size is 8:1.
Further, in the inventive method, the step 2）In electromagnetism screening method or chemical removal of iron method carry out iron removaling at Reason.
Further, in the inventive method, the step 3）In size be strong oxidizer.
The finished product molecular structure that the inventive method obtains is shown as oval graininess under the microscope, and is hollow Band lint state.
Beneficial effect：The present invention compared with prior art, has advantages below：
Comprehensively utilize existing process, collect multiple technologies the chief, accomplish to greatest extent it is following some：1 water removal, 2 reject not Stable material（Such as iron）, 3 is easy to operate, energy consumption is low, and 4 will not produce secondary pollution.
Through experimental analysis, red mud performance after processing and its stably is inert material, will not produce chemistry with other materials Reaction.It is higher compared to its intensity than traditional packing material, and there is more preferable heat endurance, mobility and ageing resistace, And there is certain fire resistance.As the packing material in the fields such as PVC plastic, fiberglass, pitch, papermaking and rubber, Properties of product are not only increased, and greatly reduce production cost.Red mud after processing is hollow belt lint particle, can be preferably Combined with being filled thing, intensity improves and helps to mitigate the weight of synthetic.
It is 5 ~ 35% as addition of the inserts in product（The adding proportion of different products）, market prospects are huge Greatly.Currently used inserts mainly has two kinds, and 1, calcium carbonate（500 ~ 900 yuan/ton）, 2 aluminium hydroxides（1800 ~ 4000 yuan/ Ton）.The red mud of the inventive method processing, cost are cheap（150 ~ 450 yuan/ton）, waste water and waste gas, energy are not produced in production process Enough eliminate secondary pollution.
Embodiment
With reference to embodiment, the present invention is further illustrated.
In the embodiment 1 of the inventive method, comprise the following steps：
1）The impurity in red mud is rejected, is then added and is accounted for the carbon dust of red mud mass percent 3%, accounts for red mud mass percent Fusion is stirred after 15% soda water；
2）Remove the step 1）Leachate in product, iron removaling processing is carried out after drying, obtains semi-finished product white clay；
3）The white clay is loaded into electrical heating vacuum reactor, size is added, in 600 DEG C ~ 800 DEG C, 0.3-0.4MPa The mass ratio of lower reaction 85-95 minutes, white clay and size is 8:1；
4）By the step 3）Product the finished products of 500 mesh is processed into middling speed superfine mill.
In embodiment 2, step 1）The carbon dust of middle addition 5%, 12% soda water, step 3）Middle size is strong oxidizer, Step 4）The middle finished product for preparing 2000 mesh.
In embodiment 3, step 1）The carbon dust of middle addition 4%, 10% soda water, step 3）Middle size is strong oxidizer, Step 4）The middle finished product for preparing 1200 mesh.
Above-described embodiment is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill of the art For personnel, under the premise without departing from the principles of the invention, some improvement and equivalent substitution can also be made, these are to the present invention Claim be improved with the technical scheme after equivalent substitution, each fall within protection scope of the present invention.

Claims (3)

1. a kind of red mud processing method, it is characterised in that this method comprises the following steps：
1）The impurity in red mud is rejected, fusion is stirred after then adding carbon dust, soda water；
2）Remove the step 1）Leachate in product, iron removaling processing is carried out after drying, obtains semi-finished product white clay；
3）The white clay is loaded into electrical heating vacuum reactor, strong oxidizer is added, under 600 DEG C ~ 800 DEG C, 0.3 ~ 0.4MPa Reaction 85 ~ 95 minutes；
4）By the step 3）Product the finished products of 500 ~ 2000 mesh is processed into middling speed superfine mill.
2. red mud processing method according to claim 1, it is characterised in that the step 1）The carbon dust of middle addition accounts for red mud Mass percent 3 ~ 5%, soda water account for red mud mass percent 10 ~ 15%, the step 3）In, the quality of white clay and strong oxidizer Than for 8:1.
3. red mud processing method according to claim 1, it is characterised in that the step 2）It is middle using electromagnetism screening method or Chemical removal of iron method carries out iron removaling processing.
CN201610238499.9A 2016-04-18 2016-04-18 A kind of red mud processing method Active CN105713421B (en)

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CN105713421B true CN105713421B (en) 2018-02-27

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102390839A (en) * 2011-08-17 2012-03-28 四川海吉尔环保科技开发有限公司 Method for producing artificial wollastonite powder by utilizing Bayer red mud
CN103073066A (en) * 2012-11-01 2013-05-01 吕富华 Innocent treatment and resource utilization method for red mud
CN104860648A (en) * 2015-05-05 2015-08-26 遵义行远陶瓷有限责任公司 Treatment process for producing ceramic through Bayer process red mud and treatment pond

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102390839A (en) * 2011-08-17 2012-03-28 四川海吉尔环保科技开发有限公司 Method for producing artificial wollastonite powder by utilizing Bayer red mud
CN103073066A (en) * 2012-11-01 2013-05-01 吕富华 Innocent treatment and resource utilization method for red mud
CN104860648A (en) * 2015-05-05 2015-08-26 遵义行远陶瓷有限责任公司 Treatment process for producing ceramic through Bayer process red mud and treatment pond

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