CN105733726B - The red mud compound additive and preparation method of reduction domestic coke ignition temperature and application - Google Patents

Abstract

It is a kind of reduce domestic coke ignition temperature red mud compound additive parts by weight group become 30~70 parts of red mud, 30~70 parts of lime stone.Raw material sources of the present invention enrich extensively, it is cheap, ignition temperature cooling effect is significant, oxysulfide and 70% or more nitrogen oxides emission reduction, 96% or more flue dust emission reduction, to surrounding city life in the countryside coal is solved, improve rural area and city environmental quality, reduces haze weather and be of great immediate significance.

Description

The red mud compound additive and preparation method of reduction domestic coke ignition temperature and application

Technical field

The present invention relates to a kind of red mud compound additives and preparation method and application for reducing domestic coke ignition temperature.

Background technique

Coal burning be China at present so that from now on for quite a long time obtain the energy major way, a large amount of coals it is direct Dust, sulfur dioxide, nitrogen oxides of burning and exhausting etc. cause serious harm to ecological environment, especially atmospheric environment, Cause China's air environmental pollution serious, haze weather takes place frequently.Based on pollution that caused by coal burning status, country has successively put into effect a series of Law and regulation, and take strong punitive measures.Although the implementation of these regulations plays the aggravation of pollution that caused by coal burning degree It is acted on to certain containment, but still poor remote apart from environmental objective to be achieved.

In fact, rural household fire coal environmental pollution can not be ignored.According to initial estimate, northern country 1 ton of height of every burning Volatilize raw coal, it will the carbon dioxide (carbon emission coefficient 0.67) of discharge 2.5 tons or more, 150 kilograms or more other stain object (oxidation of coal rate 0.85).Civilian scattered burning coal consumption in 2014 is 1.6 hundred million tons, accounts for the 3.8% of national coal consumption, only with sulfur dioxide For discharge, power plant of China annual emissions are 2,000,000 tons, and it is the 1.6 of power plant emission total amount that civilian scattered burning, which is then up to 3,200,000 tons, Times.In addition, a series of problems, such as smoke contamination of civilian scattered burning coal, nitrogen oxides pollution, cinder pollution, is to ecological environment It destroys even more inestimable.However, being influenced by factors such as region, economy, culture, solve very difficult.To from root The pollution that caused by coal burning of rural area and samll cities and towns is solved the problems, such as in sheet, provides high-quality, low price for these areas, clean alternative fuel is to work as It is engaged in anxious.

Domestic coke is and to be aided with a small amount of coking coal, sulphur-fixing agent, carburant, combustion adjuvant etc. based on bunker coal (thermal coal), Using existing coke-oven plant's production equipment, pass through cleaning solid fuel obtained by high-temperature retorting.With blocking good, moderate strength, low Volatilization, low emission sulphur and the advantages that be not easy slagging, are not necessarily to desulfurization equipment, tail gas can meet national emission standard；And easy point Fire, continuous fiery ability is strong, heating rate is fast, firing duration is long, is the various ideal fuel of domestic life stove.

Coke is used as domestic fuel, it is necessary to solve the problems, such as coke ignition temperature height, ignition difficulties.Currently, metallurgical coke Fiery temperature is 600 DEG C or so, and bituminous coal and anthracitic ignition temperature are respectively 350 DEG C and 500 DEG C.Therefore, it is necessary to by helping The introducing for firing agent, is down to 400 DEG C or so for ignition temperature, to meet civilian furnace igniting requirement.

Patent about combustion-supporting agent for fuel coal is existing very much, and if CN90105106.3 discloses a kind of combustion-supporting agent for fuel coal, it contains There are three kinds of boron mud, lime stone, bauxite, white clay, manganese slag, iron oxide, canebreak and sodium carbonate, sodium nitrate, sodium chloride sodium At least one of salt, the combustion adjuvant can obviously improve combustion position, improve stove fire temperature；CN97105154.2 discloses a kind of suitable For the combustion-supporting agent for fuel coal of a variety of coals, mine tailings, manganese dioxide, production potassium bichromate are selected by boron mud, Calcium Carbide Ash, lime stone, iron Waste residue, produce sodium dichromate waste residue, bauxite, sodium hydroxide, sodium carbonate, sodium nitrate, sodium oxide molybdena and canebreak press one Combustion adjuvant and coal, are mixed in a certain ratio uniformly when use by certainty ratio composition；CN201310417513.8 discloses one Energy-efficient combustion-supporting agent for fuel coal of kind and preparation method thereof, formula is made of zinc oxide and manganese dioxide, and burning of coal can be improved Activity and ignition performance, flame temperature.These combustion adjuvants are the products for coal-fired exploitation, mostly using the skill for helping oxygen to burn Art principle, is directly added into fire coal, promotes coal full combustion, plays the role of combustion-supporting, energization, economizes on coal.Since domestic coke needs To pass through the special process of high-temperature retorting, most of component in combustion-supporting agent for fuel coal can fail because of pyrolytic；Therefore, civilian Coke is not available the combustion-supporting agent for fuel coal of the prior art.It is retrieved, the additive for reducing domestic coke ignition temperature has not been reported.

Summary of the invention

The object of the present invention is to provide a kind of compound additions of red mud of the reduction domestic coke ignition temperature of good cooling effect Agent and its preparation method and application.

There are significant differences for the combustion adjuvant of the present invention and existing literature report, are mainly manifested in: 1) reducing ignition temperature Mechanism is different.Traditional combustion-supporting agent for fuel coal itself is combustibles, because its ignition temperature is low, is ignited coal by spontaneous combustion, therefore, addition helps Absolute prohibition high-temperature process after combustion agent, otherwise will lose combustion-supporting effect；The combustion-supporting catalytic action derived from composite oxides of the present invention. First under high-temperature retorting reducing condition, coke surface and internal formation carbon defects are acted on by the catalytic gasification of auxiliary agent, at For the firing point of oxidizing fire；In addition, composite assistant under high temperature reducing atmospheres, will form a small amount of microcrystalline, oxygen pole is met Easy firing heat release forms localized hyperthermia's point, thus the coke that ignites.2) it is different that the stage is added.Traditional combustion-supporting agent for fuel coal is mostly in moulded coal system Standby preceding addition, then through mixing, bonding, cold moudling；Or directly enter furnace burning after mixing with scattered coal.This patent auxiliary agent is in destructive distillation It is added when coal blending, is mixed, made firm by ramming, high-temperature retorting becomes civilian clean coke.

Red mud is the industrial solid wastes being discharged after refinement aluminium oxide in bauxite, and 1 ton of aluminium oxide of every production is subsidiary to produce Raw 1.0~2.0 tons of red muds.China is used as big alumina producing state of the world the 4th, and the red mud discharged every year is up to more than 3,000 ten thousand tons, It is very big to environmental pressure.Red mud generally contain oxidation iron it is big, appearance is similar to redness of the skin or complexion soil, thus gains the name.The high aluminium of aluminium content Tu Kuang generally uses Bayer process aluminium metallurgy, and generated red mud claims Bayer process red mud；The low alumina of aluminium content is mining sintering process or connection Legal aluminium metallurgy, generated red mud are referred to as red mud from sintering process or combination method red mud.

The main chemical compositions (wt%) of various red muds

Red mud type	Bayer process red mud	Red mud from sintering process	Combination method red mud
				SiO2	3~20	20~23	18.0~20.5
CaO	6~22	40~49	38~46.8
				Al2O3	10~20	5~8	5.4~7.5
Fe2O3	30~60	7~12	6.1~7.5
				MgO		1.2~1.8
Na2O	2~10	2.0~3.0	2.8~4.0
				K2O		0.2~0.4	0.5~0.7
TiO2	0.2~10	2.5~3.3	6.1~7.7
				LOI	10~15	6~11	8~13

Note: loss on ignition (Loss on ignition, be abbreviated as LOI), also known as igloss amount refer to and dry at 105~110 DEG C The weight percent that is lost after 1000~1100 DEG C of calcinations of raw material, the crystallization being discharged during heating including raw material The CO that water, carbonate decomposition go out₂, sulphate decomposition go out SO₂And organic impurities is excluded the loss of rear object amount.

The ignition temperature that the present invention for the first time compounds red mud with calcium carbonate for reducing domestic coke.

To achieve the goals above, the technical solution used in the present invention is as follows:

It is a kind of reduce domestic coke ignition temperature red mud compound additive, parts by weight group become 30~70 parts of red mud, 30~70 parts of lime stone.

Preparation method of the present invention, includes the following steps:

By after drying red mud, raw limestone is respectively through rough and torn, thin broken to granularity≤3mm；

(2) the additive raw material being crushed is weighed respectively, and is mixed, and is stirred evenly；

(3) the mixture stirred evenly makes raw material granularity≤150 mesh (0.1mm) through dry grinding；Then 260~300 It calcines 1~2 hour, is cooled to room temperature, as red mud compound additive under the conditions of DEG C.

The application of red mud compound additive of the present invention, includes the following steps:

By red mud compound additive: mixed coal weight ratio is 0.3~6.0:100, and red mud compound additive is added to and is matched It closes in coal, air is completely cut off in gas retort and is heated to 900~1100 DEG C, continuous heating 16~for 24 hours, then red heat furnace charge is come out of the stove Room temperature is down to by quenching process, then screened to get arriving the domestic coke containing red mud compound additive.

The quality index of the mixed coal are as follows: FC_d>=50%, V_adf>=25%, A_d≤ 25%, S_td< 1.5%.

The screening be down to room temperature furnace charge screening be 25-80mm granularity.

The prior art of the present invention is compared, and direct bring and the advantages of necessarily leading to are as follows with good effect:

In the methods of the invention, used red mud compound additive, raw material sources enrich extensively, cheap, directly It connects and is added in mixed coal, the domestic coke containing red mud compound additive is made by high-temperature retorting, ignition temperature can be from 550~630 DEG C are reduced to 380~405 DEG C, and decline temperature amplitude is up to 170~225 DEG C, significant effect.

In the methods of the invention, the domestic coke of production, compared with direct burning coal, oxysulfide subtracts with nitrogen oxides 70% or more row, 96% or more flue dust emission reduction improve rural area and urban environment matter to surrounding city life in the countryside coal is solved Amount reduces haze weather and is of great immediate significance.

Specific embodiment

A specific embodiment of the invention is made below and being further explained.

Embodiment 1

(1) by Bayer process red mud (the chemical component SiO after drying₂8.51wt%, Al₂O₃17.16wt%, CaO18.77wt%, Fe₂O₃33.02wt%, Na₂O 2.73wt%, TiO₂7.14wt%, LOI 12.67wt%), lime stone Additive raw material is respectively through rough and torn, thin broken to granularity≤3mm；

(2) the Bayer process red mud 70kg being crushed, lime stone 30kg are successively weighed respectively, and is mixed, and stirring is equal It is even；

(3) the mixture stirred evenly makes raw material granularity≤150 mesh (0.1mm) through dry grinding；Then in 260 DEG C of conditions Lower calcining 2 hours, is cooled to room temperature, as red mud compound additive；

As-fired coal material by the jet coal of 20wt%, the meager coal of 15wt%, 1/3 coking coal of 30wt%, 20wt% rich coal Coking coal cooperation with 15wt% forms mixed coal；The quality index of its mixed coal are as follows: V_adf30.0%, A_d13.5%, FC_d60.6%, S_t,d0.67%；Adhesive index=74, fineness (≤3mm)=73.6%；

(5) press red mud compound additive: mixed coal weight ratio is 0.3:100, and the red mud compound additive made is added to In mixed coal, completely cuts off air in gas retort and be heated to 1100 DEG C, continuous heating 16h, through putting out after then red heat furnace charge is come out of the stove Burnt process is down to room temperature, then screened, obtains the domestic coke containing red mud compound additive that granularity is 25-80mm.In north The NS18-2 type 150m of Jing Chuanzi stove Co., Ltd production²Burnt progress combustion test civilian to gained, is surveyed in civilian reverberatory furnace Its pollutant effulent is tried, compared with direct fire coal, oxysulfide emission reduction 72%, nitrogen oxides emission reduction 70%, flue dust emission reduction 96%.

Comparative example: not adding any additive in mixed coal, in gas retort completely cut off air be heated to 1100 DEG C, persistently plus Hot 16h is down to room temperature through quenching process after then red heat furnace charge is come out of the stove, then screened, and gained granularity is the coke of 25-80mm As control coke.

Civilian to gained burnt respectively and control carries out burning point test experiments with coke in JDRD-5A type determination of ignition point instrument, reality Test that the results are shown in Table 1.

Table 1 adds compound additive and compares with the burning point for being not added with compound additive coke

Test group	Burning point DEG C	Decline temperature DEG C
			Control coke	550	-
Add the civilian coke of compound additive	380	170

Embodiment 2

(1) by red mud from sintering process (the chemical component SiO after drying₂22.67wt%, Al₂O₃7.68wt%, CaO40.78wt%, Fe₂O₃10.97wt%, MgO 1.77wt%, Na₂O 2.93wt%, K₂O 0.38wt%, TiO₂3.26wt%, LOI 9.56wt%), lime stone additive raw material is respectively through rough and torn, thin broken to granularity≤3mm；

(2) the red mud from sintering process 60kg being crushed, lime stone 40kg are successively weighed respectively, and is mixed, and stirring is equal It is even；

(3) the mixture stirred evenly makes raw material granularity≤150 mesh (0.1mm) through dry grinding；Then in 270 DEG C of conditions Lower calcining 1.8 hours, is packed, as red mud compound additive after being cooled to room temperature；

(4) as-fired coal not gluing by the weakly caking coal of 30wt%, the jet coal of 40wt%, the gas rich coal of 20wt% and 10wt% Coal cooperation forms mixed coal；Its quality index (wt%): V_adf35.0%, A_d13.5%, FC_d56.2%, S_t,d0.84%, bonding Index G=40, fineness (≤3mm)=86.5%；

(5) press red mud compound additive: mixed coal weight ratio is 1.7:100, and the red mud compound additive made is added to In mixed coal, completely cuts off air in gas retort and be heated to 1050 DEG C, continuous heating 18h, through putting out after then red heat furnace charge is come out of the stove Burnt process is down to room temperature, then screened, obtains the domestic coke containing red mud compound additive that granularity is 25-80mm.In north The NS18-2 type 150m of Jing Chuanzi stove Co., Ltd production²Burnt progress combustion test civilian to gained, is surveyed in civilian reverberatory furnace Its pollutant effulent is tried, compared with direct fire coal, oxysulfide emission reduction 74%, nitrogen oxides emission reduction 71%, flue dust emission reduction 96.5%.

Comparative example: not adding any additive in mixed coal, in gas retort completely cut off air be heated to 1050 DEG C, persistently plus Hot 18h is down to room temperature through quenching process after then red heat furnace charge is come out of the stove, then screened, and gained granularity is the coke of 25-80mm As control coke.

Civilian to gained burnt respectively and control carries out burning point test experiments with coke in JDRD-5A type determination of ignition point instrument, reality Test that the results are shown in Table 2.

Table 2 adds compound additive and compares with the burning point for being not added with compound additive coke

Test group	Burning point DEG C	Decline temperature DEG C
			Control coke	570	-
Add the civilian coke of compound additive	385	185

Embodiment 3

(1) by combination method red mud (the chemical component SiO after drying₂18.1wt%, Al₂O₃9.18wt%, CaO46.09wt%, Fe₂O₃6.66wt%, Na₂O 4.0wt%, K₂O 0.63wt%, TiO₂6.72wt%, LOI 8.62wt%), lime stone additive raw material is respectively through rough and torn, thin broken to granularity≤3mm；

(2) combination method red mud 50kg, the lime stone 50kg being crushed successively are weighed respectively, and is mixed, and stirring is equal It is even；

(3) the mixture stirred evenly makes raw material granularity≤150 mesh (0.1mm) through dry grinding；Then in 280 DEG C of conditions Lower calcining 1.5 hours, is packed, as red mud compound additive after being cooled to room temperature；

As-fired coal material by the jet coal of 20wt%, the meager coal of 15wt%, 1/3 coking coal of 30wt%, 20wt% rich coal Coking coal cooperation with 15wt% forms mixed coal；The quality index of its mixed coal are as follows: V_adf30.0%, A_d13.5%, FC_d60.6%, S_t,d0.67%；Adhesive index=74, fineness (≤3mm)=73.6%；

(5) press red mud compound additive: mixed coal weight ratio is 3.2:100, and the red mud compound additive made is added to In mixed coal, completely cuts off air in gas retort and be heated to 1000 DEG C, continuous heating 20h, through putting out after then red heat furnace charge is come out of the stove Burnt process is down to room temperature, then screened, obtains the domestic coke containing red mud compound additive that granularity is 25-80mm.In north The NS18-2 type 150m of Jing Chuanzi stove Co., Ltd production²Burnt progress combustion test civilian to gained, is surveyed in civilian reverberatory furnace Its pollutant effulent is tried, compared with direct fire coal, oxysulfide emission reduction 76%, nitrogen oxides emission reduction 72%, flue dust emission reduction 97%；

Comparative example: not adding any additive in mixed coal, in gas retort completely cut off air be heated to 1000 DEG C, persistently plus Hot 20h is down to room temperature through quenching process after then red heat furnace charge is come out of the stove, then screened, and gained granularity is the coke of 25-80mm As control coke.

Civilian to gained burnt respectively and control carries out burning point test experiments with coke in JDRD-5A type determination of ignition point instrument, reality Test that the results are shown in Table 3.

Table 3 adds compound additive and compares with the burning point for being not added with compound additive coke

Test group	Burning point DEG C	Decline temperature DEG C
			Control coke	590	-
Add the civilian coke of compound additive	390	200

Embodiment 4

(1) by Bayer process red mud (the chemical component SiO after drying₂18.7wt%, Al₂O₃10.6wt%, CaO7.8wt%, Fe₂O₃46.8wt%, Na₂O 4.6wt%, TiO₂0.7wt%, LOI 10.8wt%), lime stone additive Raw material is respectively through rough and torn, thin broken to granularity≤3mm；

(2) the Bayer process red mud 40kg being crushed, lime stone 60kg are successively weighed respectively, and is mixed, and stirring is equal It is even；

(3) the mixture stirred evenly makes raw material granularity≤150 mesh (0.1mm) through dry grinding；Then in 290 DEG C of conditions Lower calcining 1.3 hours, is packed, as red mud compound additive after being cooled to room temperature；

(4) as-fired coal not gluing by the weakly caking coal of 30wt%, the jet coal of 40wt%, the gas rich coal of 20wt% and 10wt% Coal cooperation forms mixed coal；Its quality index (wt%): V_adf35.0%, A_d13.5%, FC_d56.2%, S_t,d0.84%, bonding Index G=40, fineness (≤3mm)=86.5%；

(5) press red mud compound additive: mixed coal weight ratio is 4.6:100, and the red mud compound additive made is added to In mixed coal, completely cuts off air in gas retort and be heated to 950 DEG C, continuous heating 22h, through quenching after then red heat furnace charge is come out of the stove Process is down to room temperature, then screened, obtains the domestic coke containing red mud compound additive that granularity is 25-80mm.In Beijing The NS18-2 type 150m of Chuan Zi stove Co., Ltd production²Burnt progress combustion test civilian to gained, test in civilian reverberatory furnace Its pollutant effulent, compared with direct fire coal, oxysulfide emission reduction 77%, nitrogen oxides emission reduction 73%, flue dust emission reduction 97.5%.

Comparative example: not adding any additive in mixed coal, in gas retort completely cut off air be heated to 950 DEG C, persistently plus Hot 22h is down to room temperature through quenching process after then red heat furnace charge is come out of the stove, then screened, and gained granularity is the coke of 25-80mm As control coke.

Civilian to gained burnt respectively and control carries out burning point test experiments with coke in JDRD-5A type determination of ignition point instrument, reality Test that the results are shown in Table 4.

Table 4 adds compound additive and compares with the burning point for being not added with compound additive coke

Test group	Burning point DEG C	Decline temperature DEG C
			Control coke	610	-
Add the civilian coke of compound additive	395	215

Embodiment 5

(1) by red mud from sintering process (the chemical component SiO after drying₂20.8wt%, Al₂O₃5.2wt%, CaO48.4wt%, Fe₂O₃9.4wt%, MgO 1.24wt%, Na₂O 2.06wt%, K₂O 0.21wt%, TiO₂ 2.54wt%, LOI 10.15wt%), lime stone additive raw material is respectively through rough and torn, thin broken to granularity≤3mm；

(2) the red mud from sintering process 30kg being crushed, lime stone 70kg are successively weighed respectively, and is mixed, and stirring is equal It is even；

(3) the mixture stirred evenly makes raw material granularity≤150 mesh (0.1mm) through dry grinding；Then in 300 DEG C of conditions Lower calcining 1 hour, is packed, as red mud compound additive after being cooled to room temperature；

As-fired coal material by the jet coal of 20wt%, the meager coal of 15wt%, 1/3 coking coal of 30wt%, 20wt% rich coal Coking coal cooperation with 15wt% forms mixed coal；The quality index of its mixed coal are as follows: V_adf30.0%, A_d13.5%, FC_d60.6%, S_t,d0.67%；Adhesive index=74, fineness (≤3mm)=73.6%；

(5) press red mud compound additive: mixed coal weight ratio is 6.0:100, and the red mud compound additive made is added to In mixed coal, completely cut off air in gas retort and be heated to 900 DEG C, continuous heating for 24 hours, through quenching after then red heat furnace charge is come out of the stove Process is down to room temperature, then screened, obtains the domestic coke containing red mud compound additive that granularity is 25-80mm.In Beijing The NS18-2 type 150m of Chuan Zi stove Co., Ltd production²Burnt progress combustion test civilian to gained, test in civilian reverberatory furnace Its pollutant effulent, compared with direct fire coal, oxysulfide emission reduction 78%, nitrogen oxides emission reduction 74%, flue dust emission reduction 98%；

Comparative example: not adding any additive in mixed coal, in gas retort completely cut off air be heated to 900 DEG C, persistently plus Heat for 24 hours, is down to room temperature through quenching process after then red heat furnace charge is come out of the stove, then screened, and gained granularity is the coke of 25-80mm As control coke.

Civilian to gained burnt respectively and control carries out burning point test experiments with coke in JDRD-5A type determination of ignition point instrument, reality Test that the results are shown in Table 5.

Table 5 adds compound additive and compares with the burning point for being not added with compound additive coke

Test group	Burning point DEG C	Decline temperature DEG C
			Control coke	630	-
Add the civilian coke of compound additive	405	225

After can be seen that addition red mud compound additive by Examples 1 to 5 experimental result, civilian coke is significantly reduced The burning point of charcoal ensure that a kind of application of the domestic coke as fuel so that domestic coke is easier to catch fire.

Claims (7)

1. a kind of application for the red mud compound additive for reducing domestic coke ignition temperature, it is characterised in that include the following steps:

By red mud compound additive: mixed coal weight ratio is 0.3~6.0:100, and red mud compound additive is added to mixed coal In, completely cut off air in gas retort and is heated to 900~1100 DEG C, continuous heating 16~for 24 hours, it is passed through after then red heat furnace charge is come out of the stove Quenching process is down to room temperature, then screened to get arriving the domestic coke containing red mud compound additive；

The quality index of the mixed coal are as follows: FC_d>=50%, V_adf>=25%, A_d≤ 25%, S_td< 1.5%；

The parts by weight group of the red mud compound additive for reducing domestic coke ignition temperature becomes 30~70 parts of red mud, lime stone 30~70 parts.

2. a kind of application of red mud compound additive for reducing domestic coke ignition temperature as described in claim 1, feature It is that the red mud is Bayer process red mud, red mud from sintering process or combination method red mud.

3. a kind of application of red mud compound additive for reducing domestic coke ignition temperature as claimed in claim 2, feature The weight percent chemical component for being the Bayer process red mud is SiO₂ 3-20, CaO 6-22, Al₂O₃ 10-20, Fe₂O₃ 30-60, Na₂O 2-10, TiO₂ 0.2-10, LOI 10-15.

4. a kind of application of red mud compound additive for reducing domestic coke ignition temperature as claimed in claim 2, feature The weight percent chemical component for being the red mud from sintering process is SiO₂ 20-23, CaO 40-49, Al₂O₃ 5-8, Fe₂O₃ 7- 12, Na₂O 2.0-3.0, TiO₂ 2.5-3.3 MgO 1.2-1.8, K₂O 0.2-0.4, LOI 6-11.

5. a kind of application of red mud compound additive for reducing domestic coke ignition temperature as claimed in claim 2, feature The weight percent chemical component for being the combination method red mud is SiO₂ 18.0-20.5 CaO 38-46.8, Al₂O₃ 5.4- 7.5, Fe₂O₃ 6.1-7.5, Na₂O 2.8-4.0, TiO₂ 6.1-7.7, K₂O 0.5-0.7, LOI 8-13.

6. a kind of application of red mud compound additive for reducing domestic coke ignition temperature as described in claim 1, feature It is that the screening is that be down to the furnace charge screening of room temperature be 25-80mm granularity.

7. special such as a kind of application for the red mud compound additive for reducing domestic coke ignition temperature of any one of claim 1-6 Sign is the preparation method of the red mud compound additive for reducing domestic coke ignition temperature, includes the following steps:

By after drying red mud, raw limestone is respectively through rough and torn, thin broken to granularity≤3mm；

(2) the additive raw material being crushed is weighed respectively, and is mixed, and is stirred evenly；

(3) the mixture stirred evenly makes raw material granularity≤0.1mm through dry grinding, then calcines under the conditions of 260~300 DEG C It 1~2 hour, is cooled to room temperature, as red mud compound additive.