CN103157652A - Method for preparing desulfurizer from solid waste generated in soda ash plant industry - Google Patents
Method for preparing desulfurizer from solid waste generated in soda ash plant industry Download PDFInfo
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- CN103157652A CN103157652A CN2013101217247A CN201310121724A CN103157652A CN 103157652 A CN103157652 A CN 103157652A CN 2013101217247 A CN2013101217247 A CN 2013101217247A CN 201310121724 A CN201310121724 A CN 201310121724A CN 103157652 A CN103157652 A CN 103157652A
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Abstract
The invention discloses a method for preparing a desulfurizer from solid waste generated in soda ash plant industry, which comprises the following steps: (1) mixing: evenly mixing return stone, return sand and gravel; (2) impurity removal: discharging the mixed material into a feed hopper, removing dust, discharging to a delivery belt, and removing impurities on the belt; (3) drying: delivering the material into a drying oven provided with a pulse dust remover through the belt, and carrying out drying and dust removal on the material; (4) crushing: delivering the material discharged from the drying oven into a crusher through the belt, and crushing; and (5) grinding: delivering the crushed material to a ball grinder, grinding in the ball grinder, selecting powder, and sending into a finished product bin. The invention has the advantages of simple technical process and low energy consumption, can be used for preparing the high-quality limestone powder desulfurizer with high CaO purity, high activity and fewer impurities, changes wastes into valuable substances, and greatly lowers the production cost.
Description
Technical field
The solid waste that the present invention relates to produce in the industry of ammonia alkali legal system Sodium Carbonate Plant fully utilizes, particularly a kind of method of utilizing the solid waste that produces in Sodium Carbonate Plant industry to produce fat lime stone flour desulfurizing agent.
Background technology
Soda ash is maximum, the purposes of output key industry raw material very widely in basic chemical industry.China is the soda ash producing country of global production capacity maximum, is also the unique soda ash producing country that has connection alkali, ammonia alkali, three kinds of ripe production technologies of trona in the whole world.At present, China's soda ash annual production accounts for more than 40% of global soda ash output up to 2,400 ten thousand tons.Ammonia alkali, natural soda purification device obviously are subject to the restriction of the aspects such as resource, region and environmental protection, trona technique is exactly the production technology of ammonia alkali legal system soda ash in itself, need to drop into larger aspect environmental protection, quite a few alkali factory only discharges the discarded object that produces in production process and does not process, and causes the destruction of natural environment very serious.Therefore, in the production process of ammonia-soda process, trona method preparing soda, how " three wastes " are effectively processed remaining a difficult problem, become the bottleneck of restriction enterprise development.
In prior art, when utilizing ammonia-soda process soda ash, mainly can produce three kinds of solid waste: sand return, return stone and rubble.That to be lime stone do not change into emulsion itself and particle through calcining is less in sand return, after sand return quarrel out, directly catches with automobile, walks to be put at last the stockyard.Returning stone is that lime stone does not change into emulsion through calcining and particle is larger, after returning stone quarrel out, directly catches with automobile, is put at last the stockyard.Rubble is stone through screening, and particle does not reach requirement, directly transports to the stockyard with automobile.
Generally, 1 ton of soda ash of every production needs 1.4 tons of lime stones, can produce 50 kilograms and return stone, 30 kilograms of sand returns and 90 kilograms of rubbles.The limestone resource utilization rate is 88%, and discarded rate is 12%.The Sodium Carbonate Plant sand return of middle and small scale, the annual production of returning stone and rubble can reach more than 90,000 tons, and after accumulation over the years, it measures big well imagining.In addition, be equivalent to be used for heap fortune with the cost of buying 12% lime stone and process these discarded objects, waste a large amount of manpower and financial resources.For example, the Sodium Carbonate Plant of the middle and small scale 20 mu of large stockyards of generally having an appointment, sand return, return stone and rubble is put into the stockyard, if near have the building site to want landfill, then spend freight charges to transport to the building site.Dust flies upward all over the sky and waves near the stockyard, and environmental pollution is serious, all can not plant in several kilometers.
Energy-saving and emission-reduction, cleaner production are the needs of social development, are also the requirements of industry sustainable development.Along with the Environmental Protection in China rules are more and more stricter, these sand returns, return stone and rubble owing to can not get sufficient disposal and utilization, the long-term stacking is unpractical, eventually must process it, and more late processing cost is higher.Sand return, the heap freight charges that return stone, rubble, land occupation resource expense and handling must cause the raising of alkali factory integrated cost, but also may cause environmental protection not pass a test.
At present, for sand return in ammonia-soda process soda ash process, return the comprehensive utilizating research of stone and rubble, domestic and international rarely found report, main cause is that its contaminative, harmfulness are far below waste gas, waste liquid and the alkaline residue etc. of the discharging of alkali factory, and for a long time, these solid waste are used for paving the way or as the shaft kiln cement raw material etc. always, although value is very low, major part still can be consumed.And along with the pay attention to day by day of socialization environmental protection, the eliminating of the raising that the road quality level is required and shaft kiln cement plant, the above-mentioned solid waste consumption rate that alkali factory produces descends greatly, therefore, seeks new to utilize approach imperative.
Summary of the invention
The purpose of this invention is to provide the solid waste that produces in a kind of Sodium Carbonate Plant industry and make the method for desulfurizing agent, technological process is simple, and energy consumption is low, can produce the fat lime stone flour desulfurizing agent that CaO purity is high, activity is high, impurity is few, turn waste into wealth, greatly reduce production costs.
Technical scheme of the present invention is: the solid waste that produces in a kind of Sodium Carbonate Plant industry is made the method for desulfurizing agent, comprises that concrete steps are as follows:
(1) mix: will return stone, sand return, rubble and evenly mix;
(2) removal of impurity: mixed material is discharged into feed hopper, and blanking to belt conveyor, and is carried out Impurity removal on belt after dedusting;
(3) oven dry: with material by Belt Conveying to the drying oven that is provided with pulsed dust-removing device, material is dried and dedusting;
(4) fragmentation: from drying oven material out again through Belt Conveying to disintegrating machine, carry out fragmentation;
(5) grind: the mass transport after fragmentation is to ball mill, and enters finished bin after selecting powder by ball mill grinding.
In step of the present invention (2), at first mixed material carries out dedusting by bag-type dust collector, then removes metal garbage by powerful magnet.
In step of the present invention (3), when the temperature of drying oven is shown as 300 when spending, the blower fan of starting impulse dust arrester configuration is transferred to frequency converter with rotation speed of fan and is shown " 500 "; When the temperature of drying oven is shown as 500 when spending, rotation speed of fan is transferred to frequency converter shows running between " 1050～1200 ", at this moment, the beginning charging.
In step of the present invention (3), when material is dried in drying oven, the pulsed dust-removing device processing of automatically dust of kicking up in drying course being gathered dust, the powder that gathers dust directly enters finished bin through elevator.
In step of the present invention (4), from drying oven material out, further remove metal garbage by powerful magnet on belt conveyor, then enter disintegrating machine.
In step of the present invention (4), material enters disintegrating machine and carries out the one-level fragmentation, and it is broken into particle below one centimeter, then enters the semi-finished product storehouses through semi-finished product lifter.
In step of the present invention (5), the material after fragmentation is delivered to ball mill through elevator, enters the material of ball mill after grinding, selection by winnowing 100 orders～325 purpose product introduction finished bin; After selection by winnowing, underproof product comes back to ball mill and grinds.
The invention has the beneficial effects as follows:
(1) the present invention is the sand return that produces in ammonia alkali legal system soda ash process, returns stone, these three kinds of solid waste of rubble and found the practicable new approach that utilizes, combine the technology such as oven dry, dedusting and grinding, can produce fat lime stone flour desulfurizing agent, technological process is simple, with low cost, energy-conserving and environment-protective are applicable to large-scale production application;
The sand return that produces in the Sodium Carbonate Plant industrial processes, return stone and rubble mainly is comprised of CaCO3, Ca (OH) 2, burning CaO, high-temperature calcination generates CaO, wherein sand return, returns Shi Zhongyue and contains 30% Ca (OH) 2.CaO in material＞52%; MgO＜2%; SiO2＜1%; Al2O3 and Fe2O3 all＜1% can be used as the boiler flue gas desulfurization agent by the replace lime stone flour in theory fully.Above-mentioned three kinds of solid waste are applied to boiler flue gas desulfurization, not only meet present country-driven energy-saving and emission-reduction requirement, simultaneously also satisfied the inevitable requirement that enterprise realizes cleaner production, sustainable development, and can turn waste into wealth, realized resource 100% utilization, thereby saved other natural resources or raw material in short supply, and reduced and need the more limestone mines of exploitation and to the destruction of ecological environment and the consumption of the energy.Power plant is used desulfurizing agent, not only widened the scope of available resources (can utilize raw material), and reduced production cost.Therefore, the present invention can obtain many-sided social benefit, and is very meaningful.
After by the present invention, three kinds of solid waste being carried out integrated treatment, establish the little stockyard of 500 squares in alkali factory, the return stone, sand return, rubble that produce in soda ash process processed are put into the inside, rickle field, water sprays, allow sand return, return stone and fully absorb moisture, basically solve dirt problems, reduced the pollution to environment.Load onto ship by dumper again, transport to the factory floor of making desulfurizing agent and get final product.The present invention has effectively avoided long-term stacking and the accumulation of solid waste, saves land resource.
(2) the desulfurizing agent products C aO purity of producing through the present invention is high, and active high (containing part Ca (OH) 2), impurity is few, reaches the standard of the high-quality desulfurized limestone powder of power plant's use fully, can be directly used in environment protection desulphurization.Utilize desulfurizing agent desulfuration efficiency of the present invention greater than 95%, accessory substance gypsum purity is greater than 85%.
The standard of the fat lime powder desulfurizing agent of producing by the present invention is: CaO＞52%; MgO＜2%; SiO2＜1%; 325 order percent of pass 〉=90%(can according to user's needs, adjust the order number).
(3) raw material sources are easy, and " treatment of wastes with processes of wastes against one another " belongs to " recycling economy " category, and the desulfurized limestone powder price that the present invention produces has obvious competitive advantage, meet country's " recycling economy " theory.
Description of drawings
Fig. 1 is the process chart that the solid waste that produces in Sodium Carbonate Plant industry is made desulfurizing agent.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
Embodiment 1
One of the specific embodiment of the present invention as shown in Figure 1, the solid waste that produces in a kind of Sodium Carbonate Plant industry is made the method for desulfurizing agent, comprises that concrete steps are as follows:
(1) mix: will return stone, sand return, rubble and evenly mix; Returning the concrete ratio of stone, sand return, rubble can decide according to actual conditions, mixes to get final product.
In the present embodiment, be specially: in the place of special use, will return stone, sand return, rubble with forklift and evenly mix according to the ratio of 1.6:1:3.2.
(2) removal of impurity: mixed material is discharged into feed hopper, and blanking to belt conveyor, and is carried out Impurity removal on belt after dedusting;
(3) oven dry: with material by Belt Conveying to the drying oven that is provided with pulsed dust-removing device, material is dried and dedusting;
(4) fragmentation: from drying oven material out again through Belt Conveying to disintegrating machine, carry out fragmentation;
(5) grind: the mass transport after fragmentation is to ball mill, and enters finished bin after selecting powder by ball mill grinding.
In the step of the present embodiment (2), six groups of powerful magnets are equipped with in the belt conveyor top, with forklift, the material that mixes is discharged into feed hopper, at first mixed material carries out dedusting by bag-type dust collector, then enter the powerful magnet of first, second and third group by Belt Conveying, remove most of metal garbage.
In the step of the present embodiment (3), when the temperature of drying oven is shown as 300 when spending, the blower fan of starting impulse dust arrester configuration is transferred to frequency converter with rotation speed of fan and is shown " 500 ", and can't begin charging this moment; When the temperature of drying oven is shown as 500 when spending, rotation speed of fan is transferred to frequency converter shows " 1050 " running, at this moment, the beginning charging.
In step (3), when material was dried in drying oven, pulsed dust-removing device started, the processing (major part is calcium hydroxide) of automatically dust of kicking up in drying course being gathered dust, and the powder that gathers dust directly enters finished bin through elevator.
In step (4), from drying oven material out, enter fourth, fifth, six group of powerful magnet by belt conveyor, namely further remove metal garbage by powerful magnet, and then enter disintegrating machine.
In step (4), material enters disintegrating machine and carries out the one-level fragmentation, and it is broken into particle diameter is particle below one centimeter, then enters the semi-finished product storehouses through semi-finished product lifter.
In step (5), the material after fragmentation is delivered to ball mill through elevator, enters the material of ball mill after grinding, selection by winnowing 100 purpose product introduction finished bin, and finished bin also is specially provided with bag-type dust collector; After selection by winnowing, underproof product comes back to ball mill and grinds.The particle size of finished product can be set flexibly according to the requirement of particular user.
At last, product is after finished bin is qualified through sample examination, and the agstone groove tank car of packing into is transported to the user.
Embodiment 2
The specific embodiment of the present invention two as shown in Figure 1, be that in step (1), the ratio of returning stone, sand return, rubble is 1.5:1:2 with a upper embodiment difference.In step (3), when the temperature of drying oven is shown as 500 when spending, rotation speed of fan is transferred to frequency converter shows " 1125 " running, at this moment, the beginning charging.In step (5), the material after fragmentation is delivered to ball mill through elevator, enters the material of ball mill after grinding, selection by winnowing 220 purpose product introduction finished bin.
Embodiment 3
The specific embodiment of the present invention three as shown in Figure 1, be that in step (1), the ratio of returning stone, sand return, rubble is 1:1:1 with embodiment 1 difference.In step (3), when the temperature of drying oven is shown as 500 when spending, rotation speed of fan is transferred to frequency converter shows " 1200 " running, at this moment, the beginning charging.In step (5), the material after fragmentation is delivered to ball mill through elevator, enters the material of ball mill after grinding, selection by winnowing 325 purpose product introduction finished bin.
Experimental example
Certain power plant has used according to the present invention the desulfurizing agent of explained hereafter.
Table 1: this power plant desulphurization system uses the agstone standard
| Project | Unit | Require parameter | Remarks |
| CaO | Wt－% | ≥50 | —— |
| SiO 2 | Wt－% | ≤0.27 | —— |
| Al 2O 3 | Wt－% | ≤0.3 | —— |
| Fe 2O 3 | Wt－% | ≤0.16 | —— |
| MgO | Wt－% | ≤1.63 | —— |
| SO 3 | Wt－% | 0.13～0.14 | —— |
| Grindability index HGI | ? | 43 | —— |
| Particle diameter | μm | 44 | Sieving rate 90% |
| Table moisture content | Wt－% | ≤1 | —— |
Table 2: the desulfurizing agent testing result that this power plant produces the present invention
The desulfurizing agent that this power plant desulphurization system uses the present invention to produce, desulfuration efficiency is 96.21%, and is fully up to standard.
Table 3: clean Gas Parameters
| Flue gas flow | 124.6 ten thousand m 3/h |
| The chimney inlet pressure | -73.09Pa |
| Flue-gas temperature | -2.0℃ |
| NO XConcentration | 51.9mg/m 3 |
| O 2Concentration | 7.46% |
| SO 2Concentration | 44.7mg/m 3 |
| H 2O concentration | 2.04% |
| CO 2Concentration | 5.1% |
| CO concentration | 30.0mg/m 3 |
| DUST concentration | 12.7mg/m 3 |
The desulfurated plaster of desulfurizing agent (agstone) output that desulphurization system use the present invention of this power plant produces reaches the GB175-2007 national standard that use in the cement plant fully.
Table 4: desulfurated plaster detected parameters
In addition, the desulfurizing agent of explained hereafter of the present invention has also been used in certain paper mill, and desulfuration efficiency is fully up to standard.
The above embodiments are only the preferred embodiments of the present invention, can not limit interest field of the present invention with this, and therefore, the equivalent variations according to the present patent application the scope of the claims is done still belongs to the scope that the present invention is contained.
Claims (7)
1. the solid waste that produces in a Sodium Carbonate Plant industry is made the method for desulfurizing agent, it is characterized in that comprising that concrete steps are as follows:
(1) mix: will return stone, sand return, rubble and evenly mix;
(2) removal of impurity: mixed material is discharged into feed hopper, and blanking to belt conveyor, and is carried out Impurity removal on belt after dedusting;
(3) oven dry: with material by Belt Conveying to the drying oven that is provided with pulsed dust-removing device, material is dried and dedusting;
(4) fragmentation: from drying oven material out again through Belt Conveying to disintegrating machine, carry out fragmentation;
(5) grind: the mass transport after fragmentation is to ball mill, and enters finished bin after selecting powder by ball mill grinding.
2. the solid waste that produces in a kind of Sodium Carbonate Plant industry according to claim 1 is made the method for desulfurizing agent, it is characterized in that in described step (2), at first mixed material carries out dedusting by bag-type dust collector, then removes metal garbage by powerful magnet.
3. the solid waste that produces in a kind of Sodium Carbonate Plant industry according to claim 2 is made the method for desulfurizing agent, it is characterized in that in described step (3), when the temperature of drying oven is shown as 300 when spending, the blower fan of starting impulse dust arrester configuration is transferred to frequency converter with rotation speed of fan and is shown " 500 "; When the temperature of drying oven is shown as 500 when spending, rotation speed of fan is transferred to frequency converter shows running between " 1050～1200 ", at this moment, the beginning charging.
4. the solid waste that produces in a kind of Sodium Carbonate Plant industry according to claim 3 is made the method for desulfurizing agent, it is characterized in that in described step (3), when material is dried in drying oven, the pulsed dust-removing device processing of automatically dust of kicking up in drying course being gathered dust, the powder that gathers dust directly enters finished bin through elevator.
5. the solid waste that produces in a kind of Sodium Carbonate Plant industry according to claim 4 is made the method for desulfurizing agent, it is characterized in that in described step (4), from drying oven material out, further remove metal garbage by powerful magnet on belt conveyor, then enter disintegrating machine.
6. the solid waste that produces in a kind of Sodium Carbonate Plant industry according to claim 5 is made the method for desulfurizing agent, it is characterized in that in described step (4), material enters disintegrating machine and carries out the one-level fragmentation, it is broken into particle below one centimeter, then enters the semi-finished product storehouses through semi-finished product lifter.
7. the solid waste that produces in a kind of Sodium Carbonate Plant industry according to claim 6 is made the method for desulfurizing agent, it is characterized in that in described step (5), material after fragmentation is delivered to ball mill through elevator, enter the material of ball mill after grinding, selection by winnowing 100 orders～325 purpose product introduction finished bin; After selection by winnowing, underproof product comes back to ball mill and grinds.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190690A (en) * | 2014-08-06 | 2014-12-10 | 华南理工大学 | Method for preparing chlorine-removal alkali residue mixture by utilizing alkali residues through ammonia-soda process and application of chlorine-removal alkali residue mixture |
| CN111454003A (en) * | 2020-04-29 | 2020-07-28 | 山东海天生物化工有限公司 | Method for recycling return sand in soda production |
| CN111977993A (en) * | 2019-05-21 | 2020-11-24 | 江苏苏盐井神股份有限公司 | Device and method for performing desulfurization or ash melting on returned stone and returned sand pulping in soda production |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190690A (en) * | 2014-08-06 | 2014-12-10 | 华南理工大学 | Method for preparing chlorine-removal alkali residue mixture by utilizing alkali residues through ammonia-soda process and application of chlorine-removal alkali residue mixture |
| CN104190690B (en) * | 2014-08-06 | 2016-05-04 | 华南理工大学 | A kind of method and application that utilizes ammonia-soda process alkaline residue to prepare dechlorination alkaline residue mixture |
| CN111977993A (en) * | 2019-05-21 | 2020-11-24 | 江苏苏盐井神股份有限公司 | Device and method for performing desulfurization or ash melting on returned stone and returned sand pulping in soda production |
| CN111454003A (en) * | 2020-04-29 | 2020-07-28 | 山东海天生物化工有限公司 | Method for recycling return sand in soda production |
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