CN105733634B - The calcium base potassium magnesium silicon compound additive and preparation method of raising domestic coke high-temperature fixed sulfur effect and application - Google Patents

The calcium base potassium magnesium silicon compound additive and preparation method of raising domestic coke high-temperature fixed sulfur effect and application Download PDF

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CN105733634B
CN105733634B CN201610102964.6A CN201610102964A CN105733634B CN 105733634 B CN105733634 B CN 105733634B CN 201610102964 A CN201610102964 A CN 201610102964A CN 105733634 B CN105733634 B CN 105733634B
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calcium base
silicon compound
coal
compound additive
magnesium silicon
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CN105733634A (en
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刘守军
杜文广
张智聪
杨颂
上官炬
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Taiyuan Green Coke Energy Co Ltd
Taiyuan University of Technology
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Taiyuan Green Coke Energy Co Ltd
Taiyuan University of Technology
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONAGEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00Other processes not covered before; Features of destructive distillation processes in general
    • C10B57/04Other processes not covered before; Features of destructive distillation processes in general using charges of special composition
    • C10B57/06Other processes not covered before; Features of destructive distillation processes in general using charges of special composition containing additives
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L9/00Treating solid fuels to improve their combustion
    • C10L9/10Treating solid fuels to improve their combustion by using additives

Abstract

It is a kind of improve domestic coke high-temperature fixed sulfur effect calcium base potassium magnesium silicon compound additive parts by weight group become 60~80 parts of lime stone, 10~20 parts of potassium feldspar, 0~20 part of silica 1,5~10 parts of magnesium carbonate.Raw material sources of the present invention enrich extensively, it is cheap, it is added directly in destructive distillation mixed coal, the domestic coke containing calcium base potassium magnesium silicon compound additive is made by high-temperature retorting, its sulfur-fixing rate at high temperature (1250 DEG C) can be increased to 50-75% from 10-15%, sulfur-fixing rate improves 40-60%, significant effect, compared with direct burning coal, 80% or more sulfur dioxide pollution object discharge can be reduced, 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

Improve the calcium base potassium magnesium silicon compound additive and preparation method of domestic coke high-temperature fixed sulfur effect And application
Technical field
The present invention relates to a kind of calcium base potassium magnesium silicon compound additive for improving domestic coke high-temperature fixed sulfur effect and preparation sides Method and application.
Background technique
Based on " rich coal, lacks natural gas at few oil " special non-renewable energy natural endowment, coal still can be within suitable long-term The most important basic energy resource in China, and nearly half coal is used directly in a manner of burning.Wherein, civilian scattered burning coal is to environment Pollution can not be ignored.According to initial estimate, the 1 ton high volatilization raw coal of the every burning of northern country, it will the titanium dioxide of 2.5 tons of discharge or more Carbon (carbon emission coefficient 0.67), 150 kilograms or more other stain object (oxidation of coal rate 0.85).Civilian scattered burning coal consumption in 2014 It is 1.6 hundred million tons, only accounts for the 3.8% of national coal consumption, by taking sulfur dioxide (SO2) emissions as an example, power plant, China annual emissions are 2,000,000 tons, Civilian scattered burning is then up to 3,200,000 tons, is 1.6 times of power plant emission total amount.In addition, civilian scattered smoke contamination, the nitrogen oxygen burnt with coal A series of problems, such as compound pollution, cinder pollution, is even more inestimable to the destruction of ecological environment.However, by region, economy, text The influence of the factors such as change solves very difficult.To fundamentally solve the problems, such as the pollution that caused by coal burning in rural area and samll cities and towns, it is These areas provide high-quality, low price, clean alternative fuel is the task of top priority.
Coal burning obtains in energy processes, and the sulfur oxidizing fire in coal is finally excluded with oxysulfide with flue gas, sternly One of the main reason for heavily contaminated atmospheric environment and China's haze and acid rain take place frequently.To control coal-fired sulfur dioxide (SO2) emissions, mesh Preceding there are three types of approach: desulfurization (flue gas after desulfurization (washing of coal), combustion process desulfurization (desulfuration in furnace) and burning before burning Desulfurization).Wherein desulfurizer therefor is mostly the calcium based sulphur-fixation reagents such as cheap lime stone/dolomite, and suitable Ca/S molar ratio exists Between 1.5-3.0.More than scale industry and coal burning boiler of power station, mostly use greatly circulating fluidized bed boiler, ignition temperature is 900 DEG C or so, in addition to strict control full content of Sulphur in coal, implement combustion process and flue gas desulfurization simultaneously mostly, oxysulfide obtains very well Control.Circulating fluidized bed boiler low-temperature burning ensure that with the high efficiency of sulfuric acid calcium speciation furnace sulfur fixation.
Civilian scattered burning stove is more simple and crude with respect to Industrial Boiler, substantially without the environmental protection facilities such as dedusting, desulfurization, pollutant category In line situation.How for the civilian scattered stove that burns the pollution that a kind of clean fuel can just solve sulfur dioxide from source is provided, because This, civilian cleaning coke comes into being.Domestic coke be based on bunker coal (thermal coal), and be aided with a small amount of coking coal, sulphur-fixing agent, Carburant, combustion adjuvant etc. pass through cleaning solid fuel obtained by high-temperature retorting using existing coke-oven plant's production equipment.Civilian coke Charcoal has many advantages, such as that blocking good, moderate strength, calorific value are high, reactivity is good, burn rate is high, smokeless low dirt, is not necessarily to desulfurization equipment, Tail gas can meet national emission standard;And easily light a fire, continuous fiery ability is strong, heating rate is fast, firing duration is long, be each The ideal fuels of kind domestic life stove substitution raw coal or moulded coal.
By testing for a long time domestic stove ignition temperature, 80% combustion zone is at 1200 DEG C or so, and with fuel bed The increase of thickness degree, local high temperature zone are more than 1250 DEG C.Domestic coke is added to calcium based sulphur-fixation reagent in coal blending, fires in domestic burners When burning, the sulphur in fuel, which ultimately forms calcium sulfate and enters ash content, to be fixed, but temperature is more than that 1000 DEG C of calcium sulfate just start point Solution, when more than 1200 DEG C, loses sulfur capturing capacity, sulfur-fixing rate is less than 20% substantially.How to realize that hi-temp hi-effective consolidates sulphur, is always this The research hotspot in field.
Patent about coal-fired sulfur fixing agent has very much, as CN200510018904.8 discloses the compound addition of coal combustion and sulfur fixation Agent contains CaO, BaCO3And Al2O3、KMnO4And MnO2Any one of or any two, or contain Al simultaneously2O3、KMnO4With MnO2, there is preferable high-temperature fixed sulfur effect;It is solid that CN201110023814.3 discloses a kind of coal mixing combustion desulfuration in furnace high temperature Sulphur agent, contains CaO, SiO2、Na2CO3、MgO、Fe2O3、Al2O3、TiO2、K2O、V2O5, SiC and sodium lignin sulfonate, greatly improve Desulfuration efficiency, can 80% SO in fire coal2It is fixed up.But the coal-fired sulfur fixing agent of the prior art be not suitable for by High-temperature retorting and the solid sulphur for preparing domestic coke.It is retrieved, the additive for improving domestic coke high-temperature fixed sulfur effect has not been reported.
Summary of the invention
The object of the present invention is to provide a kind of calcium base potassium magnesium silicon of the good raising domestic coke high-temperature fixed sulfur effect of practicability Compound additive and its preparation method and application.
The present invention and the significant difference of prior art coal-fired sulfur fixing agent are directly being burnt in coal-fired sulfur fixing agent addition fire coal Process consolidates sulphur, and calcium base potassium magnesium silicon compound additive of the invention has to pass through high-temperature retorting and coke is made after being added to mixed coal Afterwards, subsequent solid sulphur can be used for.
The present invention is based on composite oxides to consolidate sulphur mechanism, consolidates by largely screening, compounding, optimize with evaluation, formation high temperature Sulphur composite assistant.The domestic coke for adding the composite assistant burns under 1250 DEG C of high temperature, and sulfur-fixing rate is still up to 75%, this hair It is bright that domestic coke combustion process sulfur oxides emissions are greatly lowered.
To achieve the goals above, the technical solution used in the present invention is as follows:
A kind of calcium base potassium magnesium silicon compound additive improving domestic coke high-temperature fixed sulfur effect, parts by weight group become lime 60~80 parts of stone, 10~20 parts of potassium feldspar, 0~20 part of silica 1,5~10 parts of magnesium carbonate.
Preparation method of the present invention, includes the following steps:
(1) by lime stone, potassium feldspar, silica and the carbonate additive raw material after drying respectively through rough and torn, thin broken to grain Degree≤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 under the conditions of DEG C, as calcium base potassium magnesium silicon compound additive.
The application of calcium base potassium magnesium silicon compound additive of the present invention, includes the following steps:
By calcium base potassium magnesium silicon compound additive: mixed coal weight ratio is 4~10:100, by calcium base potassium magnesium silicon compound additive 4:100~10:100 is added in mixed coal, and air is completely cut off in gas retort and is heated to 900~1100 DEG C, and continuous heating 16~ For 24 hours, it is down to room temperature through quenching process after then red heat furnace charge being come out of the stove, then screened to get compound to calcium base potassium magnesium silicon is contained The domestic coke of additive.
The quality index of the mixed coal are as follows: FCd>=50%, Vadf>=25%, Ad≤ 25%, Std< 1.5%.
Screening as described above is that will drop to the furnace charge screening of room temperature 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 calcium base potassium magnesium silicon compound additive, raw material sources enrich extensively, and price is low It is honest and clean, it is added directly in destructive distillation mixed coal, the domestic coke containing calcium base potassium magnesium silicon compound additive is made by high-temperature retorting, Its sulfur-fixing rate at high temperature (1250 DEG C) can be increased to 50-75% from 10-15%, and sulfur-fixing rate improves 40-60%, significant effect.
In the methods of the invention, the domestic coke of production can reduce sulfur dioxide pollution object compared with direct burning coal 80% or more discharge improves rural area and city environmental quality to surrounding city life in the countryside coal is solved, and reduces haze weather tool There is major and immediate significance.
Specific embodiment
A specific embodiment of the invention is made below and being further explained.
Embodiment 1
By lime stone, potassium feldspar, silica and the magnesium carbonate additive raw material after drying respectively through rough and torn, thin broken extremely Granularity≤3mm;
(2) the lime stone 80kg being crushed, potassium feldspar 10kg, silica 1 0kg, magnesium carbonate 5kg are successively weighed respectively, and It is mixed, is stirred evenly;
(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 calcium base potassium magnesium silicon 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: Vadf30.0%, Ad13.5%, FCd60.6%, St,d0.67%;Adhesive index=74, fineness (≤3mm)=73.6%;
(5) press calcium base potassium magnesium silicon compound additive: mixed coal weight ratio is 4:100, is added the calcium base potassium magnesium silicon made is compound Add agent to be added in mixed coal, air is completely cut off in gas retort and is heated to 1100 DEG C, continuous heating 16h, then by red heat furnace charge Room temperature is down to through quenching process after coming out of the stove, then screened to get being that 25-80mm contains the compound addition of calcium base potassium magnesium silicon to granularity The domestic coke of agent.
Comparative example: adding single calcium-based desulfurizing agent lime stone in mixed coal with weight ratio 4:100, completely cuts off in gas retort empty Gas is heated to 1100 DEG C, and continuous heating 16h is down to room temperature through quenching process after then red heat furnace charge is come out of the stove, then screened, institute It obtains the coke that granularity is 25-80mm and is used as control coke.
The NS18-2 type 150m that Chuan Zi stove Co., Ltd produces in Beijing2Respectively to the civilian coke of gained in civilian reverberatory furnace And control carries out combustion test with coke, and the total sulphur content of coke and its ash content is measured according to Chinese mugwort scholar's block-regulations in GB/T214, according to Following formula can calculate sulfur-fixing rate.Sulfur-fixing rate calculation formula is as follows:
In formula:
Rs--- coke sulfur-fixing rate, %;
Sa,d--- the content of full sulphur, % in dry base coke ash;
St,d--- the content of dry base total Sulfur in Coke, %;
Ad--- ash content at dry 1250 DEG C of base coke, %.
Test data and sulfur-fixing rate calculated result are shown in Table 1.
Table 1 adds compound additive and the high-temperature fixed sulfur Contrast on effect for being not added with compound additive coke
Embodiment 2
By lime stone, potassium feldspar, silica and the magnesium carbonate additive raw material after drying respectively through rough and torn, thin broken extremely Granularity≤3mm;
(2) the lime stone 75kg, potassium feldspar 12.5kg, silica 1 2.5kg, magnesium carbonate being crushed successively are weighed respectively 6.3kg, and mixed, it stirs evenly;
(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 calcium base potassium magnesium silicon 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%): Vadf35.0%, Ad13.5%, FCd56.2%, St,d0.67%, bonding Index G=40, fineness (≤3mm)=86.5%;
(5) by calcium base potassium magnesium silicon compound additive: mixed coal weight ratio is that 5.5:100 is compound by the calcium base potassium magnesium silicon made Additive is added in mixed coal, and air is completely cut off in gas retort and is heated to 1050 DEG C, continuous heating 18h, then by red heat furnace Material through quenching process is down to room temperature after coming out of the stove, then screened to get being that 25-80mm contains that calcium base potassium magnesium silicon is compound to be added to granularity Add the domestic coke of agent.
Comparative example: single calcium-based desulfurizing agent lime stone is added with weight ratio 5.5:100 in mixed coal, is completely cut off in gas retort Air is heated to 1050 DEG C, and continuous heating 18h is down to room temperature through quenching process after then red heat furnace charge is come out of the stove, then screened, The coke that gained granularity is 25-80mm is as control coke.
The NS18-2 type 150m that Chuan Zi stove Co., Ltd produces in Beijing2Respectively to the civilian coke of gained in civilian reverberatory furnace And control carries out combustion test with coke, and the total sulphur content of coke and its ash content is measured according to Chinese mugwort scholar's block-regulations in GB/T214, according to Formula appended by embodiment 1 can calculate sulfur-fixing rate.Test data and sulfur-fixing rate calculated result are shown in Table 2.
Table 2 adds compound additive and the high-temperature fixed sulfur Contrast on effect for being not added with compound additive coke
Embodiment 3
By lime stone, potassium feldspar, silica and the magnesium carbonate additive raw material after drying respectively through rough and torn, thin broken extremely Granularity≤3mm;
(2) the lime stone 70kg being crushed, potassium feldspar 15kg, silica 1 5kg, magnesium carbonate 7.5kg are successively weighed respectively, And mixed, it stirs evenly;
(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 calcium base potassium magnesium silicon 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: Vadf30.0%, Ad13.5%, FCd60.6%, St,d0.67%;Adhesive index=74, fineness (≤3mm)=73.6%;
(5) by calcium base potassium magnesium silicon compound additive: mixed coal weight ratio is that 7:100 adds the calcium base potassium magnesium silicon made is compound Add agent to be added in mixed coal, air is completely cut off in gas retort and is heated to 1000 DEG C, continuous heating 20h, then by red heat furnace charge Room temperature is down to through quenching process after coming out of the stove, then screened to get being that 25-80mm contains the compound addition of calcium base potassium magnesium silicon to granularity The domestic coke of agent.
Comparative example: adding single calcium-based desulfurizing agent lime stone in mixed coal with weight ratio 7:100, completely cuts off in gas retort empty Gas is heated to 1000 DEG C, and continuous heating 20h is down to room temperature through quenching process after then red heat furnace charge is come out of the stove, then screened, institute It obtains the coke that granularity is 25-80mm and is used as control coke.
The NS18-2 type 150m that Chuan Zi stove Co., Ltd produces in Beijing2Respectively to the civilian coke of gained in civilian reverberatory furnace And control carries out combustion test with coke, and the total sulphur content of coke and its ash content is measured according to Chinese mugwort scholar's block-regulations in GB/T214, according to Formula appended by embodiment 1 can calculate sulfur-fixing rate.Test data and sulfur-fixing rate calculated result are shown in Table 3.
Table 3 adds compound additive and the high-temperature fixed sulfur Contrast on effect for being not added with compound additive coke
Embodiment 4
By lime stone, potassium feldspar, silica and the magnesium carbonate additive raw material after drying respectively through rough and torn, thin broken extremely Granularity≤3mm;
(2) secondary to weigh the lime stone 65kg, potassium feldspar 17.5kg, silica 1 7.5kg, magnesium carbonate being crushed respectively 8.7kg, and mixed, it stirs evenly;
(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 calcium base potassium magnesium silicon 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%): Vadf35.0%, Ad13.5%, FCd56.2%, St,d0.67%, bonding Index G=40, fineness (≤3mm)=86.5%;
(5) by calcium base potassium magnesium silicon compound additive: mixed coal weight ratio is that 8.5:100 is compound by the calcium base potassium magnesium silicon made Additive is added in mixed coal, and air is completely cut off in gas retort and is heated to 950 DEG C, continuous heating 22h, then by red heat furnace charge Room temperature is down to through quenching process after coming out of the stove, then screened to get being that 25-80mm contains the compound addition of calcium base potassium magnesium silicon to granularity The domestic coke of agent.
Comparative example: single calcium-based desulfurizing agent lime stone is added with weight ratio 8.5:100 in mixed coal, is completely cut off in gas retort Air is heated to 950 DEG C, and continuous heating 22h is down to room temperature through quenching process after then red heat furnace charge is come out of the stove, then screened, The coke that gained granularity is 25-80mm is as control coke.
The NS18-2 type 150m that Chuan Zi stove Co., Ltd produces in Beijing2Respectively to the civilian coke of gained in civilian reverberatory furnace And control carries out combustion test with coke, and the total sulphur content of coke and its ash content is measured according to Chinese mugwort scholar's block-regulations in GB/T214, according to Formula appended by embodiment 1 can calculate sulfur-fixing rate.Test data and sulfur-fixing rate calculated result are shown in Table 4.
Table 4 adds compound additive and the high-temperature fixed sulfur Contrast on effect for being not added with compound additive coke
Embodiment 5
By lime stone, potassium feldspar, silica and the magnesium carbonate additive raw material after drying respectively through rough and torn, thin broken extremely Granularity≤3mm;
(2) the lime stone 60kg being crushed, potassium feldspar 20kg, silica 20kg, magnesium carbonate 10kg are successively weighed respectively, And mixed, it stirs evenly;
(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 calcium base potassium magnesium silicon 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: Vadf30.0%, Ad13.5%, FCd60.6%, St,d0.67%;Adhesive index=74, fineness (≤3mm)=73.6%;
(5) by calcium base potassium magnesium silicon compound additive: mixed coal weight ratio is that 10:100 adds the calcium base potassium magnesium silicon made is compound Add agent to be added in mixed coal, air is completely cut off in gas retort and is heated to 900 DEG C, continuous heating for 24 hours, then goes out red heat furnace charge Room temperature is down to through quenching process after furnace, then screened to get being that 25-80mm contains calcium base potassium magnesium silicon compound additive to granularity Domestic coke.
Comparative example: single calcium-based desulfurizing agent lime stone is added with weight ratio 10:100 in mixed coal, is completely cut off in gas retort Air is heated to 900 DEG C, and continuous heating 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, The coke that gained granularity is 25-80mm is as control coke.
The NS18-2 type 150m that Chuan Zi stove Co., Ltd produces in Beijing2Respectively to the civilian coke of gained in civilian reverberatory furnace And control carries out combustion test with coke, and the total sulphur content of coke and its ash content is measured according to Chinese mugwort scholar's block-regulations in GB/T214, according to Formula appended by embodiment 1 can calculate sulfur-fixing rate.Test data and sulfur-fixing rate calculated result are shown in Table 5.
Table 5 adds compound additive and the high-temperature fixed sulfur Contrast on effect for being not added with compound additive coke
After can be seen that addition calcium base potassium magnesium silicon compound additive by Examples 1 to 5 experimental result, significantly improve The high-temperature fixed sulfur effect of domestic coke, so that domestic coke is more environmentally friendly, adaptability is wider, ensure that domestic coke as a kind of The application of fuel.

Claims (3)

1. a kind of application for the calcium base potassium magnesium silicon compound additive for improving domestic coke high-temperature fixed sulfur effect, it is characterised in that including Following steps:
By calcium base potassium magnesium silicon compound additive: mixed coal weight ratio is 4:100~10:100, by calcium base potassium magnesium silicon compound additive 4:100~10:100 is added in mixed coal, and air is completely cut off in gas retort and is heated to 900~1100 DEG C, and continuous heating 16~ For 24 hours, it is down to room temperature through quenching process after then red heat furnace charge being come out of the stove, then screened to get compound to calcium base potassium magnesium silicon is contained The domestic coke of additive;
The parts by weight group for improving the calcium base potassium magnesium silicon compound additive of domestic coke high-temperature fixed sulfur effect becomes lime stone 60~80 Part, 10~20 parts of potassium feldspar, 0~20 part of silica 1,5~10 parts of magnesium carbonate;
The quality index of the mixed coal are as follows: FCd>=50%, Vadf>=25%, Ad≤ 25%, Std< 1.5%.
2. a kind of calcium base potassium magnesium silicon compound additive for improving domestic coke high-temperature fixed sulfur effect as described in claim 1 is answered With, it is characterised in that it includes as follows for improving the preparation method of the calcium base potassium magnesium silicon compound additive of domestic coke high-temperature fixed sulfur effect Step:
(1) by lime stone, potassium feldspar, silica and the magnesium carbonate additive raw material after drying 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 calcium base potassium magnesium silicon compound additive.
3. a kind of calcium base potassium magnesium silicon compound additive for improving domestic coke high-temperature fixed sulfur effect as described in claim 1 is answered It is that will drop to the furnace charge screening of room temperature be 25-80mm granularity with, it is characterised in that the screening.
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