CN115532169B - Method and system for preparing special yellow phosphorus pellets by enriching phosphorus ore powder - Google Patents

Method and system for preparing special yellow phosphorus pellets by enriching phosphorus ore powder Download PDF

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CN115532169B
CN115532169B CN202211254172.2A CN202211254172A CN115532169B CN 115532169 B CN115532169 B CN 115532169B CN 202211254172 A CN202211254172 A CN 202211254172A CN 115532169 B CN115532169 B CN 115532169B
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pellets
integrated machine
tail gas
drying
yellow phosphorus
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CN115532169A (en
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黄钰雪
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Chengdu Tianyu New Phosphorus Technology Co ltd
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Chengdu Tianyu New Phosphorus Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/28—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic using special binding agents
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/02—Preparation of phosphorus
    • C01B25/027—Preparation of phosphorus of yellow phosphorus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Abstract

To improve the balling rate of the yellow phosphorus finished product pelletsThe invention provides a method and a system for preparing special yellow phosphorus pellets by enriching phosphorus ore powder. Specifically, ground phosphate rock, binder and water are processed by a ball milling-wetting mill integrated machine to obtain a ball-forming material, the ball-forming material is pressed into balls, and then the balls are obtained by drying and consolidation treatment, wherein the ball-forming material obtained by the ball milling-wetting mill integrated machine has the water content of 3% -8% and the particle size of a wetting mill outlet material is more than or equal to 65% in a range of-200 meshes. By adopting the method, P in the pellets can be removed 2 O 5 The mass percentage of the product is increased from 20-28% to 21-31%, and the effect of grade enrichment is achieved. The power consumption and carbon dioxide emission reduction of each ton of yellow phosphorus are respectively reduced by 800-3000 kwh and 1880-7100 kg, and the production cost of each ton of yellow phosphorus is reduced by 3000-8000 yuan.

Description

Method and system for preparing special yellow phosphorus pellets by enriching phosphorus ore powder
Technical Field
The invention relates to the field of phosphorus chemical industry, in particular to a method and a system for preparing special yellow phosphorus pellets by enriching phosphorus ore powder
Background
Yellow phosphorus is an important basic chemical raw material and is mainly used for preparing high-purity phosphoric acid, phosphate, red phosphorus and tetraphosphorus trisulfide (P) 4 S 3 ) Organic phosphate esters, detergents, pesticides, etc. Is commonly used for manufacturing smoke-screen bullets and combustion bullets in military. The existing yellow phosphorus in China is prepared by adopting an electric furnace method, and raw materials comprise blocky phosphorite, pyrodine (semi-coke or white coal) and silica. For many years, in order to reduce the production cost, the raw material of the phosphorite is blocky rich ore (P 2 O 5 The mass percent is more than or equal to 25 percent). Over-mining for many years, massive rich ore resources are gradually exhausted, and the yellow phosphorus production needs are difficult to meet. And a large amount of undersize (ground phosphate rock) cannot be used for wet phosphoric acid production due to high content of silicon dioxide. At present, the phosphorus ore powder piled up by a plurality of yellow phosphorus production enterprises exceeds millions of tons and even tens of millions of tons, which not only causes resource waste, but also causes outstanding environmental protection problems.
Sludge phosphorus slag is a byproduct of yellow phosphorus production. After the phosphorite, silica and pyrodine pulverized by the raw material layer at the top end of the yellow phosphorus electric furnace enter a gas washing tower along with phosphorus furnace gas, the phosphorite is washed by the phosphor washing water to form the sludge phosphorus, and the residue after the sludge phosphorus passes through a rotary pot or is sintered into the sludge phosphoric acid is the sludge phosphorus slag. P in the mud phosphorus slag 2 O 5 15-20% of C12-15% of SiO 2 The content is 32-36%. The main components have recycling value, but the toxic and harmful components are more and more complex, and the most prominent is residual elemental phosphorus (extremely toxic). The particle size is fine, dust is extremely easy to generate, and the dust is a pollutant for environmental protection and important supervision . Deep burying treatment has long been required by the environmental protection department.
In addition, with the development of mineral separation technology, particularly the national importance of development and utilization of low-grade phosphorus resources, a great deal of forward (reverse) flotation technology is adopted in China to obtain phosphorus concentrate (P 2 O 5 The average grade reaches more than 32 percent). How to produce yellow phosphorus from phosphate rock powder and phosphorus concentrate powder has become an important point of research in the industry. According to the requirements of the ecological environment department (three phosphorus) remediation technical guide and the national institute of improvement (yellow phosphorus industry energy saving carbon reduction improvement upgrading implementation guide), the yellow phosphorus tail gas is used as a heat source to dry and solidify mineral powder pellets, and then the mineral powder pellets are used for yellow phosphorus production, so that the method is a necessary route for subsequent yellow phosphorus production.
The existing phosphate rock powder pellets have the following problems:
1. green pellets and finished pellets are not stable in strength. Mainly characterized in that the strength of the green pellets is rapidly reduced after the finished pellets with high strength are fed into a furnace, the pulverization rate is obviously increased, and a large amount of dust enters a phosphorus furnace gas spraying system to generate a large amount of sludge phosphorus slag; or the strength of the finished pellets is enough, but the green pellet strength is low, the proportion of the complete pellets can only reach 20-30%, and the proportion of the broken pellets reaches 70-80%. The former is only about 20% of the mixture with the blocky phosphorite and is only marginally used for yellow phosphorus production; the latter can produce yellow phosphorus in global groups, but has low labor productivity, and the powder rate of the raw material layer in the furnace is high when the pellets are fed into the furnace, so that the sludge phosphorus slag is obviously increased, and the enterprise benefit can not be fully exerted.
2. The binding agent has very different binding properties for different phosphate rock powders, resulting in low pellet integrity.
3. The yellow phosphorus tail gas deep purification system is not perfect, the yellow phosphorus tail gas uses a common burner or direct combustion as a heat source, the tail gas components generated after combustion are very complex, and toxic and harmful substances seriously exceed standards.
4. The production environment is poor, a reliable dust removing and harmful substance adsorbing system is hardly arranged, and accordingly, fine-crushing pellets and dust collecting and recycling facilities are not arranged.
Phosphate rock pellet production method disclosed in China patent (CN 104261362B) exceptIn addition to the four general problems, the wet method phosphoric acid byproduct acid sludge used for preparing the binder has the biggest problem that phosphoric acid in the acid sludge and phosphate rock powder generate calcium hydrophosphate (CaHPO) 4 ·2H 2 O) and monocalcium phosphate (Ca (H) 2 PO 4 ) 2 ·H 2 O) does have a certain cohesiveness. And the content of phosphorus pentoxide in the phosphate rock (phosphate concentrate) powder can be increased on the surface, so that the effect of enriching the phosphate rock powder is achieved. However, calcium biphosphate (Ca (H) 2 PO 4 ) 2 ·H 2 O) has poor thermal stability, and phosphorus pentoxide (P) is decomposed after drying, roasting or entering a yellow phosphorus electric furnace at the temperature of more than 200 DEG C 2 O 5 ) Generating Ca 5 (PO 4 ) 3 . The tail gas of the pellet drying consolidation machine is not washed and purified, so that the environmental pollution is necessarily caused; when the pellets enter the yellow phosphorus electric furnace, the decomposition is aggravated, P 2 O 5 And H 2 O escapes along with the furnace gas, so that the phosphorus ore enrichment effect is not only weakened, because pyrophosphoric acid (H) 4 P 2 O 7 ) Conversely, the arching of the electric furnace can be accelerated, the material-burning probability is increased, and the air duct can be blocked when serious; the spray water of the phosphorus washing tower can also generate phosphoric acid, which affects the washing and refining effects of yellow phosphorus and increases the sewage treatment cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for preparing yellow phosphorus special pellets by enriching phosphate rock powder, which combines ball milling and moistening milling to grind raw materials, and mixes the phosphate rock powder with a special binder, so that rich net structures can be formed inside the materials, and the integrity rate of green pellets can be ensured to reach 85% -98%.
Another technical problem to be solved by the present invention is to provide a system capable of implementing the above method.
The technical scheme for solving the former problem is as follows: the phosphorite powder, the binder and the water are processed by a ball milling-wetting mill integrated machine to obtain a balling material, pressed into balls, and then dried and solidified to obtain the pellets.
Wherein, the water content of the ball-shaped material obtained by ball milling-moistening and grinding integrated machine treatment is 3-8% by mass, and the grain size of the moistening and grinding outlet material is-200 meshes not less than 65%.
P in the phosphate rock powder in the invention 2 O 5 The content is 19-28%.
The traditional ball mill has only two operation modes: firstly, dry grinding, wherein the moisture is required to be lower than 3%, and when the moisture is higher than 3% and lower than 13%, stable discharging cannot be realized, and blockage occurs; secondly, wet milling, the moisture must be more than 13%, and the problem of dehydration and drying exists in the subsequent material utilization. And the particle size of the inlet material is generally required to be less than or equal to 2mm in the traditional moistening and grinding machine. The particle size of the ground phosphate rock is generally 3-10 mm, which is relatively high, and the grinding effect of the ground phosphate rock is not satisfied with the industrial requirements of the ground phosphate rock granulation. In general, conventional ball mills cannot operate at material moisture levels of 3% to 13%.
The ball milling-moistening mill integrated machine has the functions of a ball mill and a moistening mill, wherein the feeding section is the ball milling section, the discharging section is the moistening mill section, the mass percentage of water in materials (mixture of ground phosphate rock, binder and water) is controlled to be 3% -8%, the ground phosphate rock is homogenized and ground (the particle size of the outlet materials is-200 meshes and is more than or equal to 65%), the specific surface area and sharp angle of the materials are increased, the binder is uniformly distributed in the materials, the Van der Waals force among the molecules of the materials is obviously increased, and meanwhile, a rich net structure is formed. After the ball milling-moistening and grinding integrated machine is used, the integrity rate of the green balls can be ensured to reach 85% -98%.
In the invention, the adhesive is compounded by composite silicate and a dispersing agent; the composite silicate is selected from two or more of silicate, sepiolite, bentonite and montmorillonite; the dispersing agent is one or more selected from calcium lignosulfonate, hydroxypropyl methyl cellulose and polyanionic cellulose.
In the invention, the content of the composite silicate is 1-5% of the mass of the ground phosphate rock.
In the invention, the dispersant accounts for 1-2% of the mass of the ground phosphate rock.
In the invention, na in the binder 2 O、Al 2 O 3 The sum of the mass percentages of the components is less than or equal to 1.2 percent.
In some embodiments of the invention, the bentonite is calcium bentonite or a mixture of calcium bentonite and sodium bentonite, and the particle size is-200 meshes not less than 85%; the sepiolite and montmorillonite have particle size of-200 meshes not less than 85%.
The binder compounding technology comprises compounding of silicate, sepiolite, bentonite and montmorillonite, compounding of organic dispersing agents such as calcium lignosulfonate, hydroxypropyl methylcellulose, polyanion cellulose and the like, and compounding of composite silicate and dispersing agents. Phosphate rock powder under different ore forming conditions has larger balling difference in different production places, and the binding performance of the binding agent with the same component on different phosphate rock powder is also larger in difference. Therefore, the invention carries out a compound test according to the ground phosphate rock, and obtains a better adhesive formula by adjusting the types of the compound silicate and the dispersing agent in the adhesive and the proportion of the compound silicate and the dispersing agent.
In the invention, the dispersing agent calcium lignosulfonate, hydroxypropyl methyl cellulose and polyanion cellulose can promote the even distribution of composite silicate among the balling materials, and have good low-temperature bonding performance, and the dispersing agent calcium lignosulfonate, hydroxypropyl methyl cellulose and polyanion cellulose solve the problems that the traditional bonding agent has high green ball strength and low ball strength, and the phosphorus furnace gas spraying system and the phosphorus sludge treatment system are blocked due to serious pulverization after entering a yellow phosphorus electric furnace; or the green pellet strength is low, the number of complete pellets is small, and the balling process efficiency is low.
In the pellet production process, after the pellets are fed into the furnace, the pellets are subjected to high proportion of broken pellets, and the pellets fall, collide with silica and coke, squeeze and rub to be pulverized in a large amount, so that a phosphorus furnace gas spraying system and a phosphorus sludge treatment system are blocked. The compound binder can also meet the requirements of pellets added with the sludge phosphorus slag, the silica powder and the coke powder, the pellets are not solidified at high temperature, and the pellets are solidified by sensible heat temperature rise of the yellow phosphorus electric furnace after entering the yellow phosphorus electric furnace, so that the pellets are ensured not to crack and not to be powder.
In the invention, na in the binder is limited 2 O、Al 2 O 3 The sum of the mass percentages of the components is less than or equal to 1.2 percent. The main reason is that the inventor discovers that Na 2 O and Si0 in a yellow phosphorus electric furnace 2 Sodium silicate (Na) 2 Si0 3 I.e., water glass) that, when exceeding a certain amount, accumulates in the slag flushing water to severely clog the slag flushing system. Al (Al) 2 O 3 And MgO affects the acidity value of slag in a yellow phosphorus electric furnace, thereby not only increasing the power consumption, but also affecting the fluidity of slag when slag is discharged, and causing slag discharging difficulty when serious.
In other embodiments of the present invention, the use of water glass as one of the components of the binder takes advantage of its good adhesion, but limits Na in the binder 2 O、Al 2 O 3 The sum of the mass percentages of the components is less than or equal to 1.2 percent.
In the invention, the drying and consolidation temperature is 140-1200 ℃; further, the temperature of the drying step is 140-300 ℃; further, the temperature of the consolidation step is 300-1200 ℃.
In some embodiments of the invention, the drying and consolidation steps can be carried out by special equipment (application number: 201610391664.4, grant bulletin number: CN 106066117B, grant date: 2018, 10 months and 19 days) for drying and consolidation of phosphorite pellets disclosed by the inventor team on 6/2016, wherein the drying and consolidation temperature is 140-1200 ℃, a mesh belt is arranged in the equipment, the pellets are arranged on the mesh belt, fine particles with the particle size less than 5mm fall into a dust collecting groove arranged below, and the fine particles return to the ball milling and moistening milling integrated machine through a material returning system (such as a conveyor belt).
In some embodiments of the invention, carbonate-type ground phosphate rock and silicate-type ground phosphate rock may be employed.
For carbonate type phosphorite powder green pellets (the content of calcium carbonate and magnesium carbonate is higher), the temperature of a drying section is generally 140-300 ℃, water in the green pellets is mainly evaporated, and dispersing agents in partial binders, organic matters in the pellets and partial magnesium carbonate are decomposed, so that ventilation micropores are formed in the pellets; the temperature of the consolidation section is 300-1200 ℃, the dispersant in the binder and the organic matters in the pellets are decomposed completely at first to gradually form a microporous structure, and when the temperature is raised to above 780 ℃, calcium carbonate is decomposed and CO is generated 2 The pellets overflow along micropores of the pellets (the pellets are not burst), and the pellets are solidified in the process of temperature rise due to the combined action of a compact network structure formed by the composite silicate in the pellets and low-melting-point substances, so that the pellets are not pulverized, and the strength and the wear resistance of the pellets are better. After high temperature drying and consolidation, the phosphorite powder is preparedIs decomposed by carbonate and organic matters, P in the pellets 2 O 5 The mass percentage of the product is increased from 20-28% to 21-31%, and the effect of grade enrichment is achieved.
In other embodiments of the present invention, sludge phosphorous slag, silica powder and/or coke powder may also be added to the pellet preparation raw material; p in the mud phosphorus slag 2 O 5 The content is 15-20%. The invention has no mass ratio limitation of phosphate rock powder and sludge phosphorus slag, and can use all sludge phosphorus slag generated by a yellow phosphorus electric furnace for preparing pellets, and the proportion of silicon dioxide and coke is only required to be adjusted in the raw material working section of the yellow phosphorus electric furnace according to the production process requirement of the yellow phosphorus.
Wherein, siO in the silica powder 2 The mass percentage ratio of the CaO to the coke powder is 0.78-0.87, and the carbon excess coefficient in the coke powder is 1.0-1.05.
In the invention, a pair roller ball press is adopted to press the pellets, the pressure of the pellets is 3-16 MPa, and the particle size of the pellets is 25-35 mm.
The green pellets and finished pellets in the prior art have unstable strength, or the strength of the green pellets is rapidly reduced after the finished pellets with high green pellet strength are fed into a furnace, the pulverization rate is obviously increased, and a large amount of dust enters a phosphorus furnace gas spraying system to generate a large amount of sludge phosphorus slag; or the strength of the finished pellets is enough, but the green pellet strength is low, the proportion of the complete pellets can only reach 20-30%, and the proportion of the broken pellets reaches 70-80%. According to our deep studies, there are mainly five major problems: firstly, the adhesive components are unreasonably selected and manufactured; secondly, the adhesive and the ground phosphate rock are unevenly mixed; thirdly, the particle size distribution of the raw material phosphate rock powder is unreasonable, and the chelating effect of the binder cannot be fully exerted; fourthly, the water content and the pressure of the balled raw materials are incorrectly selected; fifthly, the drying consolidation temperature and time are not properly configured. The present invention systematically solves these five problems by means of the above-mentioned technical measures.
In the invention, yellow phosphorus tail gas which is subjected to water washing, alkali washing and electric coke capturing and is sequentially treated is used as fuel in the drying and solidifying steps.
In the invention, the alkaline washing refers to treating yellow phosphorus tail gas by a sodium hydroxide aqueous solution with the mass percent of 29.5-30.5% and then by a sodium hypochlorite aqueous solution with the mass percent of 0.6-1.0% of effective chloride ions.
In the invention, the cloth bag dust collector collects dust from the tail gas discharged from the drying and consolidation steps, the collected dust returns to the ball milling-moistening and grinding integrated machine through a returning system, and the tail gas is subjected to water washing and electromagnetic whitening treatment to reach the discharge standard.
The invention also aims to provide a special pelletizing system for preparing yellow phosphorus by enriching phosphorus ore powder, which solves the problems of deep purification treatment and low utilization rate of yellow phosphorus tail gas, low utilization rate of dust waste and the like, can realize dry grinding and wet grinding at the same time in a grinding stage, and can realize standard emission and eliminate visual pollution of white smoke plume through cloth bag dust collection, water washing and electromagnetic white elimination treatment of waste gas, dust and the like generated by the system.
In order to achieve the above purpose, the following technical scheme is adopted:
the special pelletizing system for preparing yellow phosphorus by enriching phosphorus ore powder comprises a first conveyor belt, wherein a ball milling-moistening-grinding integrated machine, a ball pressing machine, a roller screen distributor and a drying-consolidation integrated machine are sequentially arranged on the first conveyor belt along the feeding direction of the first conveyor belt;
A second conveyor belt is arranged between the ball milling-wetting milling integrated machine and the ball pressing machine, and a third conveyor belt is arranged between the ball pressing machine and the roller screen distributor.
Further, the ball milling-moistening and grinding integrated machine comprises a rotatable cylinder, and a tail chimney for conveying water vapor in the drying-consolidation integrated machine and dust in the bag-type dust remover into the drying-consolidation integrated machine is arranged on the discharge end of the cylinder.
Further, a yellow phosphorus tail gas inlet of the drying-consolidation integrated machine is connected with the first tail gas purifying unit, and an exhaust port is connected with the second tail gas purifying unit; the first tail gas purification unit comprises a water scrubber I, an alkaline scrubber and an electrical tar precipitator which are connected in sequence through pipelines; the second tail gas purifying unit comprises a cloth bag dust remover, a water washing tower II and an electromagnetic white eliminator which are sequentially connected through pipelines.
Further, the gas outlet of the water scrubber I is connected with the gas inlet of the alkaline scrubber, the gas outlet of the alkaline scrubber is connected with the gas inlet of the electric tar precipitator, and the gas outlet of the electric tar precipitator is connected with the yellow phosphorus tail gas inlet of the drying-consolidation integrated machine.
And yellow phosphorus tail gas is introduced into the air inlet of the water washing tower I.
Further, the air inlet of the bag-type dust collector is connected with the air outlet of the drying-consolidation integrated machine, the air outlet of the bag-type dust collector is connected with the air inlet of the water washing tower II, and the air outlet of the water washing tower II is connected with the air inlet of the electromagnetic white eliminator.
Further, a fourth conveyor belt (14) is arranged below the roller screen distributor (4), and the output end of the fourth conveyor belt (14) is in butt joint with the input end of the second conveyor belt (12).
Further, the ash outlet of the drying-consolidation integrated machine (5) is in butt joint with a fifth conveyor belt (15), the ash outlet of the bag-type dust collector (9) is in butt joint with the fifth conveyor belt (15), and the output end (15) of the fifth conveyor belt is in butt joint with the input end of the first conveyor belt (1).
The 200-mesh sieve is used for sieving, and the mass of the 200-mesh material accounts for more than 65% of the total mass of the material. Other similar expressions may be derived by a person skilled in the art.
The carbon excess coefficient in the invention refers to the carbon calculated according to the mole ratio of the integrated reaction of the yellow phosphorus electric furnace as the standard dosage (namely 1), and the added surplus (such as 1.0-1.05) is used for ensuring the reaction to be sufficient and improving the reaction temperature.
The invention has the beneficial effects that:
1. the ball milling-wetting mill integrated machine integrates a ball mill and a wetting mill, the mass percentage of water in materials is controlled to be 3% -8%, phosphate rock powder is homogenized and ground (the grain size of an outlet material is-200 meshes and is more than or equal to 65%), the specific surface area and sharp angle of the materials are increased, a binder is uniformly distributed in the materials, the excellent binding performance of a special binder is combined, the van der Waals force among the molecules of the materials is obviously increased, a rich reticular structure is formed, the balling rate, the compressive strength and the turning index of green pellets and finished pellets are greatly improved, the continuous and stable production of global mass by a yellow phosphorus electric furnace is ensured, and the ball milling-wetting mill integrated machine is a great breakthrough of yellow phosphorus production raw material routes in China.
2. The binder compounding technology solves the technical problem of binder selection of rock phosphate balls under different production areas and different ore forming conditions, and has the characteristic of great cost-saving effect.
3. The invention solves the problem of the resource utilization of the waste phosphate rock powder and the poisonous and harmful sludge phosphorus slag of the traditional yellow phosphorus device, and can recycle P in the pellets 2 O 5 The mass percentage of the product is increased from 19-28% to 21-31%, and the effect of grade enrichment is achieved. The integrity rate of the green pellets reaches 85-98%, and the compressive strength of the pellets is more than or equal to 85kg/cm after drying and consolidation 2 The turning index is more than or equal to 85 percent. Realizing 100 percent of the production of yellow phosphorus by pellets. The power consumption per ton yellow phosphorus is reduced by 800-3000 kwh, the emission reduction of carbon dioxide is reduced by 1880-7100 kg (only the power consumption reduction and CO are calculated) 2 Direct reduction, supra). The invention is matched with CN 105329865B (application number: 201510677012.2) disclosed by the inventor team, and can be widely applied to yellow phosphorus production. The existing low-quality phosphate rock powder and sludge phosphorus slag which are abandoned in the production process of yellow phosphorus with huge stock are recycled and prepared into special pellets for producing yellow phosphorus by utilizing the pellet production system, which are required to be piled up, shielded or deeply buried and are treated by various environmental protection measures, the rise amplitude reaches 300-900 yuan/ton, the cost of raw materials of yellow phosphorus per ton is reduced by 3000-8000 yuan, and the economic benefit and the environmental protection benefit are very remarkable.
4. The deep purification facility for yellow phosphorus tail gas of the invention remarkably eliminates the problems of blockage of coal tar, dust and the like in the yellow phosphorus tail gas and pollution of a post-system, preferably uses a low-nitrogen burner as a heat source, and nitrogen oxides (N) of the post-combustion tail gas X O), hydrogen sulfide (H) 2 S), phosphine (H) 3 P), silicon tetrafluoride (SiF) 4 ) And the toxic and harmful substances are greatly reduced. Besides meeting the requirement that the invention is used as a clean heat source, the invention can also be directly used for power generation (yellow phosphorus tail gas energy utilization) of a gas turbine and C1 chemical raw materials.
5. The invention realizes ultra-low emission, and also collects dust and fine particles to return to the ball milling-moistening mill integrated machine to realize the circular clean production.
Drawings
FIG. 1 is a diagram of a system for preparing yellow phosphorus special pellet by enriching phosphorus ore powder;
FIG. 2 is a diagram of a ball milling-moistening mill integrated machine;
FIG. 3 is a flow chart of the pellet preparation of example 1;
FIG. 4 is a flow chart of the pellet preparation of example 2;
FIG. 5 is a flow chart of the pellet preparation of example 3;
fig. 6 is a flowchart of the pellet preparation of example 4.
The reference numerals and corresponding part names in the drawings:
1-conveyer belt, 2-ball milling-wet milling all-in-one, 3-ball press, 4-roller screen distributor, 5-drying-consolidation all-in-one, 6-water scrubber I, 7-alkaline scrubber, 8-electric tar precipitator, 9-bag dust remover, 10-water scrubber II, 11-electromagnetic white eliminator, 12-second conveyer belt, 13-third conveyer belt, 14-fourth conveyer belt, 15 fifth conveyer belt, A-first tail gas purification unit, B-second tail gas purification unit.
16-feed inlet, 17-barrel, 18-steel lining board, 19-rubber lining board, 20-main motor, 21-main speed reducer, 22-driving pinion, 23-driving large gear, 24-steel ball, 25-discharge port, 26-tail chimney and 27-inspection manhole.
Detailed Description
The present invention will now be described in detail with reference to fig. 1-5 and examples, it being understood that the embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. It should be further noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
The traditional ball mill has only two operation modes: firstly, dry grinding, wherein the moisture is required to be lower than 3%, and when the moisture is higher than 3% and lower than 13%, stable discharging cannot be realized, and blockage occurs; secondly, wet milling, the moisture must be more than 13%, and the problem of dehydration and drying exists in the subsequent material utilization. That is, the conventional ball mill cannot be operated when the moisture of the material is 3% to 13%.
The particle size of the inlet materials is generally less than or equal to 2mm in the traditional large and medium-sized lubricating mill used in metallurgy and steel industry. The particle size of the ground phosphate rock is generally 3-10 mm, which is higher, and the addition of a fine crusher or a ball mill can solve the problem of inlet particle size, but the addition of equipment and working procedures tends to increase investment cost and management cost.
The ball milling-moistening milling integrated machine exactly solves the problems, saves investment, has low running cost and obviously improves labor productivity.
In some embodiments, the mass percentage of water in the material (the mixture of ground phosphate rock, sludge and phosphorus slag, binder and water) is controlled to be 3-8% by using a ball milling-wetting mill integrated machine. The phosphorite powder is homogenized and ground (the grain size of the outlet material is-200 meshes and is more than or equal to 65 percent), the specific surface area and sharp angle of the material are increased, the binder is uniformly distributed in the material, the van der Waals force among the molecules of the material is obviously increased, and meanwhile, a rich reticular structure is formed. After the ball milling-moistening and grinding integrated machine is used, the integrity rate of the green balls can be ensured to reach 85% -98%.
The roller screen distributor is used for conveying and screening out fine powder and broken pellets, and finally delivering qualified raw pellets into a drying-consolidation integrated machine and uniformly distributing the raw pellets on a conveying mesh belt.
In some embodiments, the pellets are pressed using a twin roll ball press, the pressure of the pressed pellets being 3-16 MPa and the pellet size being 25-35 mm.
The drying and consolidation step can be carried out by adopting special equipment (application number: 201610391664.4, authorized bulletin number: CN 106066117B, authorized date: 2018, 10 month and 19 days) for drying and consolidation of phosphorite pellets disclosed by the inventor team on 6 th month and 6 th day, wherein the drying and consolidation temperature is 140-1200 ℃, a mesh belt is arranged in the equipment, the pellets are arranged on the mesh belt, fine particles with the particle size smaller than 5mm fall into a dust collecting groove arranged below the equipment, and the fine particles are returned to the ball milling-moistening grinding integrated machine through a returning system.
In some embodiments, yellow phosphorus tail gas is passed to a low nitrogen combustor and the heat released is used in the drying, consolidation step.
In some embodiments, the binder is formulated with a complex silicate and a dispersant. The composite silicate comprises a mixture of two or more of silicate, sepiolite, bentonite and montmorillonite, and the addition amount of the composite silicate is 1-5% of the mass of the material. The dispersing agent comprises one or a mixture of a plurality of organic dispersing agents such as calcium lignosulfonate, hydroxypropyl methyl cellulose, polyanionic cellulose and the like, and the adding amount of the dispersing agent is 1-2% of the mass of the material.
In some embodiments, na in the binder 2 O、Al 2 O 3 The sum of the mass percentages of the components is less than or equal to 1.2 percent. Mainly restrict Na 2 O and Al 2 O 3 The total amount of the two harmful components is limited because of its concomitant nature in the complex silicate. Wherein Na is 2 The harm of O is mainly represented by the oxygen and Si0 in the yellow phosphorus electric furnace 2 Sodium silicate (Na) 2 Si0 3 I.e., water glass) that, when exceeding a certain amount, accumulates in the slag flushing water to severely clog the slag flushing system. Al (Al) 2 O 3 And MgO affects the acidity value of slag in a yellow phosphorus electric furnace, thereby not only increasing the power consumption, but also affecting the fluidity of slag when slag is discharged, and causing slag discharging difficulty when serious.
In some embodiments, the ground phosphate rock may be carbonate-type ground phosphate rock and silicate-type ground phosphate rock.
For carbonate type phosphorite powder green pellets (the content of calcium carbonate and magnesium carbonate is higher), the temperature of a drying section is generally 140-300 ℃, water in the green pellets is mainly evaporated, and dispersing agents in partial binders, organic matters in the pellets and partial magnesium carbonate are decomposed, so that ventilation micropores are formed in the pellets; the temperature of the consolidation section is 300-1200 ℃, the dispersant in the binder and the organic matters in the pellets are decomposed completely at first to gradually form a microporous structure, and when the temperature is raised to above 780 ℃, calcium carbonate is decomposed and CO is generated 2 The pellets overflow along micropores of the pellets (the pellets are not burst), and the pellets are solidified in the process of temperature rise due to the combined action of a compact network structure formed by the composite silicate in the pellets and low-melting-point substances, so that the pellets are not pulverized, and the strength and the wear resistance of the pellets are better. After high temperature drying and consolidation, the carbonate and organic matters in the phosphate rock powder are decomposed, and P in the pellets 2 O 5 The mass percentage of the product is increased from 20-28% to 21-31%, and the effect of grade enrichment is achieved.
Due to the traditional yellow phosphorus production processIn the method, a large amount of phosphorus sludge is formed, the silica powder and the coke powder cannot be used for yellow phosphorus production, and the economic value of the method is greatly reduced. In other embodiments of the present invention, phosphorus sludge, silica powder and/or coke powder may be added to the pellet preparation raw material; and correspondingly, the investment and the running cost of the raw material system are greatly reduced. Wherein, siO in the silica powder 2 The mass percentage ratio of the CaO to the coke powder is 0.78-0.87, and the carbon excess coefficient in the coke powder is 1.0-1.05.
The yellow phosphorus tail gas is deeply purified by a water scrubber (I) 6, an alkaline scrubber 7 and an electric tar precipitator 8 to obtain clean yellow phosphorus tail gas.
In the yellow phosphorus production process, the phosphorus furnace gas is washed for 3-4 times in a water washing tower (I) 6, but the washing water temperature is gradually reduced from high to low so as to collect yellow phosphorus as a main component, and dust and other harmful components still remain in tail gas. See the following table:
yellow phosphorus tail gas main component
Yellow phosphorus tail gas is conveyed into a water washing tower through a pipeline and is washed by normal-temperature clean water, and the water temperature is generally lower than 20 ℃. Mainly wash out elemental phosphorus (P) 4 ) Hydrogen Fluoride (HF), phosphorus pentoxide (P) 2 O 5 ) Phosphorus trioxide (P) 2 O 3 ) Sulfur dioxide (SO) 2 ) Hydrogen sulfide (H) 3 S), silicon tetrafluoride (SiF 4 ) And dust and other impurities.
The washing water is neutralized and reacted with limestone in a baffling tank, and the main chemical reaction formula is as follows:
SO 2 +H 2 O→H 2 SO 3
H 2 SO 3 +CaCO 3 →CaSO 3 ↓+H 2 O+CO 2 ↑
P 2 O 5 +3H 2 O→2H 3 PO 4
H 3 PO 4 +CaCO 3 →CaHPO 4 ↓+H 2 O+CO 2 ↑
3SiF 4 +2H 2 O→2H 2 SiF 6 +SiO 2
(3SiF 4 +(n+2)H 2 O→2H 2 SiF 6 +SiO 2 ·nH 2 O↓)
(H 2 SiF 6 →SiF 4 ↑+2HF↑)
H 2 SiF 6 +CaCO 3 →CaSiF 6 +H 2 O+CO 2 ↑
the main purpose of caustic washing is to remove inorganic (mainly hydrogen sulphide) and organic (mainly carbonyl) sulphur from the tail gas. Washing with 29.5-30.5% sodium hydroxide aqua, washing with sodium hypochlorite, generating sodium hypochlorite solution through sodium chloride electrolysis with sodium hypochlorite generator, and oxidizing to eliminate residual H in yellow phosphorus tail gas with sodium hypochlorite in the amount of 0.6-1.0% to produce effective chloride ion 2 S and H 3 P。
The carbonyl sulfide can react with sodium hydroxide with low concentration to generate sodium sulfide and sodium carbonate (irreversible reaction), and the high concentration sodium hydroxide can react with hydrogen sulfide to generate sodium sulfide, and the tail gas of the yellow phosphorus furnace contains 2-4% of carbon dioxide and reacts with sodium hydroxide to generate sodium carbonate. The yellow phosphorus furnace tail gas is washed by sodium hydroxide, so that the byproduct sodium sulfide pentahydrate or sodium sulfide nonahydrate can be recycled, and the economic benefit is increased. The main chemical reaction equation is as follows:
H 2 S+2NaOH→Na 2 S+2H 2 o (high concentration sodium hydroxide)
H 2 S+NaOH→NaHS+H 2 O
CO 2 +2NaOH→Na 2 CO 3 +H 2 O
CO 2 +NaOH→NaHCO 3
COS+4NaOH→Na 2 S+Na 2 CO 3 +2H 2 O (Low concentration sodium hydroxide)
NaHS+NaOH→Na 2 S+H 2 O
NaHCO 3 +NaOH→Na 2 CO 3 +H 2 O
As the diced coke of one of the three raw materials for producing yellow phosphorus, the national standard prescribes that the volatile component is lower than 1.8 percent, and the tail gas contains a small amount of coal tar.
The yellow phosphorus tail gas after secondary two-stage sodium hypochlorite washing needs to enter an electric tar precipitator (the purification efficiency is more than or equal to 98%), and most of coal tar, residual dust and moisture in the tail gas are purified. In the electric tar remover, all three elements of the combustible gas explosion are provided, so the automatic protection of the electric tar remover must be designed, and once the oxygen content in the tail gas reaches 1.5%, an alarm signal is sent out, and when the oxygen content in the tail gas reaches 2%, the electric tar remover is immediately powered off, so that one element of the three elements of the explosion is eliminated, and the explosion accident of the tail gas is avoided (the explosion range of carbon monoxide is 12% -74.2%). The electrical tar precipitator is PLC or DCS complete control, has overvoltage, continuous undervoltage and peroxidation protection functions, and can automatically alarm and trip.
The electrical tar precipitator of the present invention preferably adopts a high-efficiency honeycomb tower structure, and is explosion-proof.
The yellow phosphorus tail gas purifying method can be directly used for gas turbine power generation (yellow phosphorus tail gas energy utilization) and C1 chemical raw materials, such as carbon monoxide hydrolysis for preparing H, besides meeting the requirement of the invention for being used as a clean heat source 2 Etc.
The cloth bag dust remover carries out dust collection treatment on the tail gas discharged by the drying-consolidation integrated machine. And returning the collected dust to the ball milling-moistening and grinding integrated machine through a returning system.
The tail gas collected by the bag-type dust collector is preferably subjected to spray water washing, and after the drying-consolidation integrated machine is introduced into electromagnetic whitening, the electromagnetic whitening device generates continuous transient electromagnetic energy, so that when low-temperature wet tail gas enters an electromagnetic field, the electromagnetic energy magnetizes the mixed water mist pollutants, and the diffusion coefficient, surface expansion force, viscosity and other physical properties of the water mist are increased and enhanced; the mixed pollutant is continuously collided and agglomerated in the flowing process of the electromagnetic field to form large liquid drops, the buoyancy of tail gas is overcome, the mixed pollutant is finally discharged from the bottom of the electromagnetic whitening device by means of self gravity, and clean gas leaves from the upper part of the electromagnetic whitening device. The electromagnetic white-eliminating comprehensive droplet trapping rate is above 97%, so that dust and solid particles in the tail gas can be removed, and meanwhile, water and aerosol in the tail gas are removed, so that the dust emission standard is achieved, and white smoke plume is thoroughly eliminated.
The system can be provided with an independent PLC or DCS control system, and can be connected with a large DCS control system for the whole yellow phosphorus production, so that the labor productivity is high, and unmanned or less operation is achieved.
As shown in fig. 1, a system for preparing yellow phosphorus special pellet by enriching phosphorus ore powder comprises: the device comprises a first conveyor belt 1, a ball milling-moistening mill integrated machine 2, a ball pressing machine 3, a roller screen distributor 4, a drying-consolidation integrated machine 5, a water washing tower (I) 6, an alkaline washing tower 7, an electric tar precipitator 8, a cloth bag dust remover 9, a water washing tower (II) 10, an electromagnetic white eliminator 11, a second conveyor belt 12, a third conveyor belt 13, a fourth conveyor belt 14 and a fifth conveyor belt 15.
A second conveyor belt 12 is arranged between the ball milling-wetting and grinding integrated machine 2 and the ball pressing machine 3, and a third conveyor belt 13 is arranged between the ball pressing machine 3 and the roller screen distributor 4.
As shown in fig. 2, the ball milling-moistening mill integrated machine of the present invention comprises a horizontally disposed cylinder 17 and a driving assembly for driving the cylinder to axially rotate. Wherein, one end of the cylinder 17 is provided with a feed inlet 16 which is in butt joint with the first conveyor belt 1, and the other end is provided with a discharge outlet 25 which is in butt joint with the second conveyor belt 12. Meanwhile, in order to achieve the effect of integrating ball milling and wet milling, the steel ball 25 is arranged in the cylinder 17, the steel lining plate 18 is covered on the inner wall of the feeding section of the cylinder 17, and the rubber lining plate 19 is covered on the inner wall of the discharging section.
In order to drive the cylinder 17 to axially rotate, the driving assembly comprises a main motor 20, a main speed reducer 21 and a driving pinion 22 which are sequentially connected in a transmission manner, and further comprises a driving large gear 23 which is arranged on the outer wall of the cylinder 17 and is coaxially arranged on the cylinder 17, wherein the driving large gear 23 is in transmission engagement with the driving pinion 22.
In addition, a tail chimney 26 for feeding the water vapor in the drying-consolidation integrated machine 5 and the dust in the bag-type dust collector 9 into the drum 17 and an overhaul manhole 27 for overhaul work are also arranged on the discharge end of the drum 17. The barrel 17 also contains a plurality of steel balls 24 for grinding the material.
In some embodiments, the tail gas inlet of the drying-consolidation integrated machine is connected with the first tail gas purifying unit A, and the exhaust port of the drying-consolidation integrated machine is connected with the second tail gas purifying unit B; the first tail gas purification unit A comprises a water washing tower (I) 6, an alkaline washing tower 7 and an electric tar precipitator 8, wherein the water washing tower (I) 6, the alkaline washing tower 7 and the electric tar precipitator 8 are sequentially connected through pipelines; the second tail gas purification unit B comprises a bag-type dust collector 9, a water scrubber (II) 10 and an electromagnetic white remover 11, wherein the bag-type dust collector 9, the water scrubber (II) 10 and the electromagnetic white remover 11 are sequentially connected through pipelines.
In some embodiments, the purified yellow phosphorus tail gas is introduced into a drying-consolidation integrated machine, and the tail gas is combusted by a low-nitrogen combustor, and the released heat is used for drying and consolidation steps.
In some embodiments, the air inlet of the water scrubber (I) 6 is connected with yellow phosphorus tail gas, the air outlet of the water scrubber (I) 6 is connected with the air inlet of the alkaline scrubber 7, the air outlet of the alkaline scrubber 7 is connected with the air inlet of the electric tar precipitator 8, and the air outlet of the electric tar precipitator 8 is connected with the tail gas inlet of the drying-consolidation integrated machine 5.
In some embodiments, the air inlet of the bag-type dust collector 9 is connected with the air outlet of the drying-consolidation integrated machine 5, the air outlet of the bag-type dust collector 9 is connected with the air inlet of the water scrubber (II) 10, and the air outlet of the water scrubber (II) 10 is connected with the air inlet of the electromagnetic white eliminator 11.
In some embodiments, a fourth conveyor belt 14 is further provided below the roller screen distributor 4, the output end of the fourth conveyor belt 14 being in butt joint with the input end of the second conveyor belt 12.
In some embodiments, the ash outlet of the drying-consolidation machine 5 is abutted against the fifth conveyor belt 15, the ash outlet of the bag-type dust collector 9 is abutted against the fifth conveyor belt 15, and the output end of the fifth conveyor belt 15 is abutted against the input end of the first conveyor belt 1.
In some embodiments, the system can be provided with an independent PLC or DCS control system, so that the labor productivity is high, and unmanned or less operation is achieved.
In the electric tar remover, all three elements of the combustible gas explosion are provided, so the automatic protection of the electric tar remover must be designed, and once the oxygen content in the tail gas reaches 1.5%, an alarm signal is sent out, and when the oxygen content in the tail gas reaches 2%, the electric tar remover is immediately powered off, so that one element of the three elements of the explosion is eliminated, and the explosion accident of the tail gas is avoided (the explosion range of carbon monoxide is 12% -74.2%). Therefore, in some embodiments of the invention, the electrical tar precipitator is PLC or DCS complete control, has overvoltage, continuous undervoltage and peroxy protection functions, and can automatically alarm and trip. The electrical tar precipitator of the present invention preferably adopts a high-efficiency honeycomb tower structure, and is explosion-proof.
Example 1
Referring to FIG. 3, a yellow phosphorus factory prepares special pellets for phosphorite from phosphorite powder shown in Table 1
Table 1: EXAMPLE 1 ground phosphate rock component
Main component P 2 O 5 SiO 2 CaO CO 2 Organic matter
Mass percent% 23％ 12％ 39％ 6％ 4％
The particle size of the ground phosphate rock is less than or equal to 4mm, and the water content is 2.5%.
The yellow phosphorus tail gas of the yellow phosphorus factory is washed by a two-stage water washing tower, and is washed by normal-temperature clean water, and the water temperature is generally lower than 21 ℃. Mainly wash out elemental phosphorus (P) 4 ) Hydrogen Fluoride (HF), phosphorus pentoxide (P) 2 O 5 ) Phosphorus trioxide (P) 2 O 3 ) Sulfur dioxide (SO) 2 ) Hydrogen sulfide (H) 3 S), silicon tetrafluoride (SiF 4 ) And dust and other impurities. Then two sets of sodium hydroxide aqueous solution alkaline washing devices with the mass percent of 30 percent are introduced, and the two sets of sodium hypochlorite aqueous solution alkaline washing devices with the mass percent of 0.6 percent of effective chloride ions connected in series in two stages are introduced into a sodium hypochlorite solution washing tower for absorption and purification, and residual H in yellow phosphorus tail gas is removed by utilizing the oxidizing property of sodium hypochlorite 2 S and H 3 P. The three-stage washing tower is a two-layer empty tower, and liquid outlets are arranged at the bottom of the tower and are respectively connected with pumps to circularly spray yellow phosphorus tail gas. The sodium hypochlorite solution is generated by sodium hypochlorite generator through sodium chloride electrolysis.
The yellow phosphorus tail gas washed by sodium hypochlorite enters an electric tar precipitator (the purification efficiency is more than or equal to 98 percent), and most of coal tar, residual dust and moisture in the tail gas are purified to obtain clean yellow phosphorus tail gas which is used as fuel of the drying-consolidation integrated machine. And once the electric tar remover detects that the oxygen content in the tail gas reaches 1.5%, an alarm signal is sent out, and when the oxygen content in the tail gas reaches 2%, the electric tar remover is immediately powered off, so that the explosion accident of the tail gas is avoided. The electrical tar precipitator is PLC complete control, has overvoltage, continuous undervoltage and peroxidation protection functions, and can automatically alarm and trip.
Preferably, high modulus sodium silicate (Na 2 O·nSiO 2 ) Dissolving by high-pressure steam with the pressure of more than 4MPa to obtain an aqueous solution with the mass percent of 5%; calcium bentonite with particle size of-200 meshes not less than 85%, sepiolite powder with particle size of-200 meshes not less than 85%, calcium lignosulfonate and hydroxypropyl methylcellulose are usedEvenly mixing the mixture by a powder mixer to prepare a binder compound intermediate, wherein the mass ratio of the calcium bentonite to the sepiolite powder to the calcium lignosulfonate to the hydroxypropyl methylcellulose is 1:0.5:0.375:0.125.
feeding the ground phosphate rock into a ball milling-wetting grinding integrated machine, adding 3.0% of binder compound intermediate and 12% of sodium silicate solution with concentration of 5% of ground phosphate rock, supplementing 5.5% of water, mixing and grinding, feeding the obtained product with particle size of-200 meshes not less than 65% and water content of 7.7% into a twin-roll ball mill with pressure of 10MPa, pressing into flat spherical pellets with diameter of 30mm, sieving to remove broken pellets and fine powder by a roll screen, uniformly spreading on an inlet end mesh belt of the drying-consolidation integrated machine, and drying and consolidating at 850 ℃ for 30 min to obtain the product with compressive strength not less than 90kg/cm 2 And the turning index is more than or equal to 89 percent, and the production of yellow phosphorus from the whole pellet is realized.
The dust and fine crushed materials collected by the dust collecting tank and the bag-type dust collector of the drying-consolidation integrated machine are returned to the ball milling-moistening milling integrated machine through a material returning system. The tail gas collected by the bag-type dust collector is preferably sprayed and washed, and the comprehensive droplet trapping rate is above 97% after electromagnetic whitening is introduced, so that dust and solid particles in the tail gas are removed, and meanwhile, water and aerosol in the tail gas are removed, so that the dust emission standard is achieved, and white smoke plume is thoroughly eliminated.
The system is connected with a DCS control system of the whole yellow phosphorus production.
After the above process treatment, the carbonate and organic matters in the green pellets are decomposed completely, the water is evaporated completely, and the P of the finished pellets is obtained 2 O 5 The content is enriched from 23% to 25.6%, the yellow phosphorus per ton is reduced by 1300kwh, and CO 2 And 2616kg of emission reduction.
Example 2
Referring to FIG. 4, a yellow phosphorus plant prepares pellets special for phosphorite by using the phosphorus concentrate powder shown in Table 2
Table 2: EXAMPLE 2 phosphorus concentrate powder Components
Main component P 2 O 5 SiO 2 CaO CO 2 Organic matter
Mass percent% 32％ 6％ 40％ 1.5％ 1.0％
The particle size of the phosphorus concentrate powder is-200 meshes and is more than or equal to 85 percent, and the water content is 7.5 to 8 percent.
The yellow phosphorus tail gas of the yellow phosphorus factory is also washed by a two-stage washing tower, is washed by normal-temperature clean water, and the water temperature is generally lower than 23 ℃. Mainly wash out elemental phosphorus (P) 4 ) Hydrogen Fluoride (HF), phosphorus pentoxide (P) 2 O 5 ) Phosphorus trioxide (P) 2 O 3 ) Sulfur dioxide (SO) 2 ) Hydrogen sulfide (H) 3 S), silicon tetrafluoride (SiF 4 ) And dust and other impurities. Then two sets of sodium hydroxide aqueous solution alkaline washing devices with the mass percent of 30.5 percent are introduced, and the two sets of sodium hypochlorite aqueous solution alkaline washing devices with the mass percent of 0.8 percent of effective chloride ions connected in series are introduced into a two-stage sodium hypochlorite solution washing tower for absorption and purification, and residual H in yellow phosphorus tail gas is removed by utilizing the oxidizing property of sodium hypochlorite 2 S and H 3 P. The three-stage washing tower is a two-layer empty tower, and the bottom of the tower is provided with liquid outlets which are respectively connected with a pump pairAnd (5) carrying out cyclic spraying on yellow phosphorus tail gas. The sodium hypochlorite solution is generated by sodium hypochlorite generator through sodium chloride electrolysis.
The yellow phosphorus tail gas washed by sodium hypochlorite enters an electric tar precipitator (the purification efficiency is more than or equal to 98 percent), and most of coal tar, residual dust and moisture in the tail gas are purified to obtain clean yellow phosphorus tail gas which is used as fuel of the drying-consolidation integrated machine. And once the electric tar remover detects that the oxygen content in the tail gas reaches 1.5%, an alarm signal is sent out, and when the oxygen content in the tail gas reaches 2%, the electric tar remover is immediately powered off, so that the explosion accident of the tail gas is avoided. The electrical tar precipitator is PLC complete control, has overvoltage, continuous undervoltage and peroxidation protection functions, and can automatically alarm and trip.
Uniformly mixing calcium bentonite with the particle size of-200 meshes being more than or equal to 85%, sodium bentonite with the particle size of-200 meshes being more than or equal to 85%, calcium lignosulfonate, hydroxypropyl methylcellulose and polyanion cellulose by a powder mixer to prepare a binder, wherein the mass ratio of the calcium bentonite to the sodium bentonite to the calcium lignosulfonate to the hydroxypropyl methylcellulose is 1:0.25:0.375:0.125:0.125.
Feeding the phosphorus concentrate powder and the sludge phosphorus slag into a moistening mill, adding 2.75% of binder for moistening and grinding, feeding the mixture into a twin-roll ball press with the outlet water content of 7.2% -7.7% and the pressure of 12MPa, pressing the mixture into oval flat pellets with the diameter of 30X 35mm, sieving the oval flat pellets and the fine powder by a roll sieve, uniformly scattering the oval flat pellets and the fine powder on an inlet end mesh belt of a drying-consolidation integrated machine, and drying and consolidating the flat pellets at 300 ℃ for 30 minutes to obtain the powder with the compressive strength of not less than 92kg/cm 2 And the conversion index is more than or equal to 91 percent, and the production of yellow phosphorus from the whole pellet is realized.
The dust and fine crushed materials collected by the dust collecting tank and the bag-type dust collector of the drying-consolidation integrated machine are returned to the ball milling-moistening milling integrated machine through a material returning system. The tail gas collected by the bag-type dust collector is preferably sprayed and washed, and the comprehensive droplet trapping rate is above 97% after electromagnetic whitening is introduced, so that dust and solid particles in the tail gas are removed, and meanwhile, water and aerosol in the tail gas are removed, so that the dust emission standard is achieved, and white smoke plume is thoroughly eliminated.
The system is connected with a DCS control system of the whole yellow phosphorus production.
After the above process treatment, a small part of magnesium carbonate and organic matters in the green pellets are decomposed, the water is evaporated completely, and the P of the finished pellets is obtained 2 O 5 The content is enriched from 32% to 32.8%, compared with the same grade lump ore, the power consumption of 2400kwh and CO are reduced for ton of yellow phosphorus 2 And the emission is reduced by 2629kg.
Example 3
Referring to FIG. 5, a yellow phosphorus factory prepares special pellets for phosphorite by mixing silicate type phosphorite powder and carbonate type phosphorite powder shown in tables 3 and 4
Table 3: EXAMPLE 3 silicate-type ground phosphate rock component
Main component P 2 O 5 SiO 2 CaO CO 2 Organic matter
Mass percent% 25％ 30％ 35％ 4％ 3.5％
Table 4: EXAMPLE 3 carbonate-type ground phosphate rock component
Main component P 2 O 5 SiO 2 CaO CO 2 Organic matter
Mass percent% 23％ 8％ 39％ 6.5％ 4％
The particle size of the silicate type and carbonate type phosphate rock powder is less than or equal to 8mm, and the water content is 3.5%.
The yellow phosphorus tail gas of the yellow phosphorus factory is washed by a two-stage water washing tower, and is washed by normal-temperature clean water, and the water temperature is generally lower than 19 ℃. Mainly wash out elemental phosphorus (P) 4 ) Hydrogen Fluoride (HF), phosphorus pentoxide (P) 2 O 5 ) Phosphorus trioxide (P) 2 O 3 ) Sulfur dioxide (SO) 2 ) Hydrogen sulfide (H) 3 S), silicon tetrafluoride (SiF 4 ) And dust and other impurities. Then two sets of sodium hydroxide aqueous solution with the mass percent of 29.8 percent are introduced for alkaline washingThe device is then put into a two-stage series sodium hypochlorite solution washing tower with the mass percent of effective chloride ions of 1.0 percent for absorption and purification, and residual H in yellow phosphorus tail gas is removed by utilizing the oxidizing property of sodium hypochlorite 2 S and H 3 P. The three-stage washing tower is a two-layer empty tower, and liquid outlets are arranged at the bottom of the tower and are respectively connected with pumps to circularly spray yellow phosphorus tail gas. The sodium hypochlorite solution is generated by sodium hypochlorite generator through sodium chloride electrolysis.
The yellow phosphorus tail gas washed by sodium hypochlorite enters an electric tar precipitator (the purification efficiency is more than or equal to 98 percent), and most of coal tar, residual dust and moisture in the tail gas are purified to obtain clean yellow phosphorus tail gas which is used as fuel of the drying-consolidation integrated machine. And once the electric tar remover detects that the oxygen content in the tail gas reaches 1.5%, an alarm signal is sent out, and when the oxygen content in the tail gas reaches 2%, the electric tar remover is immediately powered off, so that the explosion accident of the tail gas is avoided. The electrical tar precipitator is PLC complete control, has overvoltage, continuous undervoltage and peroxidation protection functions, and can automatically alarm and trip.
The sepiolite powder with the particle size of-200 meshes being more than or equal to 85%, sodium bentonite with the particle size of-200 meshes being more than or equal to 85%, calcium lignosulfonate, hydroxypropyl methylcellulose and polyanion cellulose are uniformly mixed by a powder mixer to prepare the adhesive, wherein the mass ratio of the sepiolite powder to the sodium bentonite to the calcium lignosulfonate to the hydroxypropyl methylcellulose to the polyanion cellulose is 1.25:0.25:0.385:0.135:0.135.
The silicate type phosphate rock powder and the carbonate type phosphate rock powder are mixed according to SiO in the components 2 The mass percentage of CaO is 0.8 as a control index, and the ratio is calculated: 92.00% of silicate type phosphate rock powder and 7.90% of carbonate type phosphate rock powder are fed into a ball milling-moistening and grinding integrated machine, 3.5% of binder is added, 4.5% of water is supplemented for mixed grinding, the grain size of the outlet material is-200 meshes not less than 65%, the water content is 7.7%, the outlet material is fed into a twin-roll ball mill with the pressure of 8MPa, the outlet material is pressed into flat spherical pellets with the diameter of 30mm, the flat spherical pellets and the fine powder are removed by a roller screen, the flat spherical pellets and the fine powder are uniformly spread on an inlet end net belt of the drying-solidifying integrated machine, and the flat spherical pellets with the compressive strength not less than 87kg/cm are obtained after drying and solidifying for 30 minutes at 850 DEG C 2 Index of turnAnd the qualified phosphorus ore pellets special for the yellow phosphorus are more than or equal to 88 percent, so that the yellow phosphorus is produced by the whole pellets.
The dust and fine crushed materials collected by the dust collecting tank and the bag-type dust collector of the drying-consolidation integrated machine are returned to the ball milling-moistening milling integrated machine through a material returning system. The tail gas collected by the bag-type dust collector is preferably sprayed and washed, and the comprehensive droplet trapping rate is above 97% after electromagnetic whitening is introduced, so that dust and solid particles in the tail gas are removed, and meanwhile, water and aerosol in the tail gas are removed, so that the dust emission standard is achieved, and white smoke plume is thoroughly eliminated.
The system is connected with a DCS control system of the whole yellow phosphorus production.
After the above process treatment, the carbonate and organic matters in the green pellets are decomposed completely, the water is evaporated completely, and the P of the finished pellets is obtained 2 O 5 The comprehensive content is enriched from 24.84% to 26.95%, the silica required by the traditional yellow phosphorus production is also eliminated, the ton yellow phosphorus is reduced by more than 1100kwh, and the CO 2 1948kg of emission reduction.
Example 4
Referring to FIG. 6, a yellow phosphorus plant prepares pellets special for phosphorite by using phosphorus concentrate powder, silica powder and coke powder shown in tables 5-7
Table 5: EXAMPLE 4 phosphorus concentrate powder Components
Main component P 2 O 5 SiO 2 CaO CO 2 Organic matter
Mass percent% 32％ 6％ 40％ 1.5％ 1.0％
Table 6: EXAMPLE 4 silica powder component
Main component SiO 2 Fe 2 O 3 Al 2 O 3 CaO Moisture content
Mass percent% 94％ 0.26％ 1.48％ 0.81％ 4.0％
Table 7: EXAMPLE 4 Coke powder component
Main component Fixed carbon Ash content Volatile component Moisture content
Mass percent% 82.0％ 15.50％ 2.0％ 0.0％
The particle size of the phosphorus concentrate powder is-200 meshes and is more than or equal to 85 percent, and the water content is 7.5 to 8 percent. The grain size of the silica powder is less than or equal to 10mm, and the grain size of the coke powder is less than or equal to 5mm.
The yellow phosphorus tail gas of the yellow phosphorus factory is also washed by a two-stage washing tower, is washed by normal-temperature clean water, and the water temperature is generally lower than 23 ℃. Mainly wash out elemental phosphorus (P) 4 ) Hydrogen Fluoride (HF), phosphorus pentoxide (P) 2 O 5 ) Phosphorus trioxide (P) 2 O 3 ) Sulfur dioxide (SO) 2 ) Hydrogen sulfide (H) 3 S), silicon tetrafluoride (SiF 4 ) And dust and other impurities. Then two sets of sodium hydroxide aqueous solution alkaline washing devices with the mass percent of 30.1 percent are introduced, and the two sets of sodium hypochlorite aqueous solution alkaline washing devices with the mass percent of 0.95 percent of effective chloride ions connected in series are introduced into a two-stage sodium hypochlorite solution washing tower for absorption and purification, and residual H in yellow phosphorus tail gas is removed by utilizing the oxidizing property of sodium hypochlorite 2 S and H 3 P. The three-stage washing tower is two layersThe empty tower is provided with liquid outlets at the bottom of the tower, which are respectively connected with pumps to circularly spray yellow phosphorus tail gas. The sodium hypochlorite solution is generated by sodium hypochlorite generator through sodium chloride electrolysis.
The yellow phosphorus tail gas washed by sodium hypochlorite enters an electric tar precipitator (the purification efficiency is more than or equal to 98 percent), and most of coal tar, residual dust and moisture in the tail gas are purified to obtain clean yellow phosphorus tail gas which is used as fuel of the drying-consolidation integrated machine. And once the electric tar remover detects that the oxygen content in the tail gas reaches 1.5%, an alarm signal is sent out, and when the oxygen content in the tail gas reaches 2%, the electric tar remover is immediately powered off, so that the explosion accident of the tail gas is avoided. The electrical tar precipitator is PLC complete control, has overvoltage, continuous undervoltage and peroxidation protection functions, and can automatically alarm and trip.
Uniformly mixing calcium bentonite with the particle size of-200 meshes being more than or equal to 85%, sodium bentonite with the particle size of-200 meshes being more than or equal to 85%, calcium lignosulfonate, hydroxypropyl methylcellulose and polyanion cellulose by a powder mixer to prepare a binder, wherein the mass ratio of the calcium bentonite to the sodium bentonite to the calcium lignosulfonate to the hydroxypropyl methylcellulose is 1:0.25:0.375:0.125:0.125.
The method comprises the steps of mixing phosphorus concentrate powder, phosphorus slag, silica powder and coke powder according to a mass ratio of 1:0.01:0.27:0.11 are sent into a ball milling-moistening and grinding integrated machine, 3.5 percent of binder is added for moistening and grinding, the water content of an outlet is 7.2 to 7.7 percent, the ball milling integrated machine is sent into a twin-roll ball mill with the pressure of 12MPa, oval flat pellets with the diameter of 25 multiplied by 35mm are pressed, the broken pellets and fine powder are removed by a roll screen, the powder is evenly spread on an inlet end mesh belt of the drying-solidifying integrated machine, and the powder is dried and solidified for 30 minutes at 300 ℃ to obtain the powder with the compressive strength of more than or equal to 90kg/cm 2 And the conversion index is more than or equal to 92 percent, and the production of yellow phosphorus from the whole pellet is realized.
The dust and fine crushed materials collected by the dust collecting tank and the bag-type dust collector of the drying-consolidation integrated machine are returned to the ball milling-moistening milling integrated machine through a material returning system. The tail gas collected by the bag-type dust collector is preferably sprayed and washed, and the comprehensive droplet trapping rate is above 97% after electromagnetic whitening is introduced, so that dust and solid particles in the tail gas are removed, and meanwhile, water and aerosol in the tail gas are removed, so that the dust emission standard is achieved, and white smoke plume is thoroughly eliminated.
The system is connected with a DCS control system of the whole yellow phosphorus production.
After the above process treatment, a small part of magnesium carbonate and organic matters in the green pellets are decomposed, the water is evaporated completely, and the P of the finished pellets is obtained 2 O 5 The content is enriched from 32% to 32.8%, compared with the same grade lump ore, the power consumption of 2400kwh and CO are reduced for ton of yellow phosphorus 2 And 2800kg of emission reduction. Particularly important, the embodiment realizes that yellow phosphorus can be produced by only one raw material (namely 100 percent of pellets special for yellow phosphorus), greatly simplifies the raw material system of the yellow phosphorus production device and greatly reduces capital investment and operation cost.
Example 5
Comparative test of the adhesive of the invention with conventional adhesives.
Test ground phosphate rock was as in example 1.
Test conditions:
the adhesive is prepared by uniformly compounding sepiolite powder with the particle size of-200 meshes being more than or equal to 85%, sodium bentonite with the particle size of-200 meshes being more than or equal to 85%, calcium lignosulfonate, hydroxypropyl methylcellulose and polyanion cellulose by a powder stirrer, wherein the mass ratio of the sepiolite powder to the sodium bentonite to the calcium lignosulfonate to the hydroxypropyl methylcellulose to the polyanion cellulose is 1:0.25:0.428:0.16:0.16.
the phosphorite powder is sent into a ball milling-wetting grinding integrated machine, 3.5 percent of binder is added, 4.5 percent of water is added for mixed grinding, the grain size of the outlet material is more than or equal to 65 percent of minus 200 meshes, the water content is 7.7 percent, the mixture is sent into a twin-roll ball mill with the pressure of 8MPa, the mixture is pressed into flat spherical pellets with the diameter of 30mm, the flat spherical pellets and the fine powder are removed by a roll screen, the flat spherical pellets and the fine powder are uniformly spread on an inlet end mesh belt of the drying-consolidation integrated machine, and the flat spherical pellets are dried and consolidated for 30 minutes at 850 ℃.
The contrast binder is dilute phosphoric acid, composite silicate, water glass and organic binder. Wherein the dilute phosphoric acid is 20% of mud phosphoric acid by mass percent, and the addition amount is 6% of the mass of the ground phosphate rock; the composite silicate is sepiolite powder with the particle size of-200 meshes being more than or equal to 85 percent and sodium bentonite with the particle size of-200 meshes being more than or equal to 85 percent, the mass ratio is 1:0.2, and the addition amount is 6 percent of the mass of the phosphate rock powder; the sodium silicate is sodium silicate aqueous solution with the modulus of 2.5 and the mass percentage of 15 percent, and the addition amount is 6 percent of the mass of the ground phosphate rock; the organic binder is calcium lignosulfonate, hydroxypropyl methylcellulose and polyanion cellulose, the mass ratio is 1:0.3:0.3, and the addition amount is 1.5% of the mass of the ground phosphate rock.
The comparative test results are shown in the following table:
TABLE 8 comparison of the Performance of the adhesives of the invention with conventional adhesives
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the present application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
It will be appreciated by persons skilled in the art that the above embodiments are provided for clarity of illustration only and are not intended to limit the scope of the invention. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present invention.

Claims (8)

1. A method for preparing yellow phosphorus special pellets by enriching phosphate rock powder is characterized in that the phosphate rock powder, a binder and water are treated by a ball milling-wetting mill integrated machine to obtain a balled material, pressed into pellets, and then dried and solidified to obtain pellets;
wherein, the water content percentage of the ball-shaped material obtained by ball milling-moistening milling integrated machine treatment is 3-8%, and the grain size of the moistening milling outlet material is-200 meshes not less than 65%; the ball milling-moistening and grinding integrated machine (2) comprises a rotatable cylinder (17) and a driving assembly for driving the cylinder to axially rotate, wherein one end of the cylinder (17) is provided with a feed inlet (16) which is in butt joint with the first conveyor belt (1), and the other end of the cylinder is provided with a discharge outlet (25) which is in butt joint with the second conveyor belt (12); steel balls (24) are arranged in the cylinder (17), a steel lining plate (18) is covered on the inner wall of the feeding section of the cylinder (17), and a rubber lining plate (19) is covered on the inner wall of the discharging section; a tail chimney (26) for conveying the water vapor in the drying-consolidation integrated machine (5) and the dust in the bag-type dust remover (9) into the drum is arranged at the discharge end of the drum (17); the air inlet of the bag-type dust collector (9) is connected with the air outlet of the drying-consolidation integrated machine (5), the air outlet of the bag-type dust collector (9) is connected with the air inlet of the water scrubber II (10), and the air outlet of the water scrubber II (10) is connected with the air inlet of the electromagnetic absorber Bai Qi (11); the binder is formed by compounding compound silicate and a dispersing agent, wherein the compound silicate is two or three of sepiolite, bentonite and montmorillonite; the bentonite is calcium bentonite or a mixture of calcium bentonite and sodium bentonite, and the particle size is-200 meshes and is more than or equal to 85%; the sepiolite and montmorillonite have particle sizes of-200 meshes not less than 85%;
The dispersant is selected from calcium lignosulfonate and hydroxypropyl methylTwo or three of cellulose and polyanionic cellulose; the content of the composite silicate is 1-5% of the mass of the ground phosphate rock; the dispersant accounts for 1 to 2 percent of the mass of the ground phosphate rock; na in the binder 2 O、Al 2 O 3 The sum of the mass percentages of the components is less than or equal to 1.2 percent.
2. The method according to claim 1, wherein yellow phosphorus tail gas which is sequentially treated by water washing, alkali washing and electric coke capturing is used as fuel in the drying and solidifying steps.
3. The method according to claim 2, wherein the alkaline washing is to pass yellow phosphorus tail gas through 29.5-30.5% sodium hydroxide aqueous solution by mass percent and then through 0.6-1.0% sodium hypochlorite aqueous solution by mass percent of effective chloride ions.
4. The method according to claim 1, wherein the pellets are pressed by a twin-roll ball press, the pressure of the pressed pellets is 3-16 MPa, and the particle size of the pellets is 25-35 mm.
5. The method of claim 1, wherein the drying step is carried out at a temperature of 140 to 300 ℃ and the consolidation step is carried out at a temperature of 300 to 1200 ℃.
6. The method according to claim 1, wherein the pellet preparation raw material further comprises sludge phosphorous slag, silica powder and/or coke powder; wherein, siO in the silica powder 2 The mass percentage ratio of the CaO to the coke powder is 0.78-0.87, and the carbon excess coefficient in the coke powder is 1.0-1.05.
7. The method of claim 1, wherein the bag-type dust collector collects dust from the tail gas discharged from the drying and consolidation steps, the collected dust is returned to the ball milling-moistening-grinding integrated machine through a material returning system, the tail gas is washed with water, and the electromagnetic whitening treatment is carried out to achieve the standard emission.
8. The special pelletizing system for preparing yellow phosphorus by enriching phosphorus ore powder is characterized by comprising a first conveyor belt (1), wherein a ball milling-wetting and grinding integrated machine (2), a ball pressing machine (3), a roller screen distributor (4) and a drying-consolidation integrated machine (5) are sequentially arranged on the first conveyor belt (1) along the feeding direction of the first conveyor belt; a second conveyor belt (12) is arranged between the ball milling-wetting milling integrated machine (2) and the ball pressing machine (3), and a third conveyor belt (13) is arranged between the ball pressing machine (3) and the roller screen distributor (4); the ball milling-moistening and grinding integrated machine (2) comprises a rotatable barrel (17), a steel ball (24) is arranged in the barrel (17), a steel lining plate (18) is covered on the inner wall of a feeding section of the barrel (17), a rubber lining plate (19) is covered on the inner wall of a discharging section, and a tail chimney (26) for conveying water vapor in the drying-solidifying integrated machine (5) and dust in the bag-type dust remover (9) into the barrel is arranged at the discharging end of the barrel (17); the air inlet of the bag-type dust collector (9) is connected with the air outlet of the drying-consolidation integrated machine (5), the air outlet of the bag-type dust collector (9) is connected with the air inlet of the water scrubber II (10), and the air outlet of the water scrubber II (10) is connected with the air inlet of the electromagnetic absorber Bai Qi (11); the tail gas inlet of the drying-consolidation integrated machine (5) is connected with the first tail gas purifying unit (A), and the exhaust port of the drying-consolidation integrated machine (5) is connected with the second tail gas purifying unit (B); the first tail gas purification unit (A) comprises a water scrubber I (6), an alkaline scrubber (7) and an electrical tar precipitator (8) which are sequentially connected through pipelines; the second tail gas purifying unit (B) comprises a bag-type dust collector (9), a water scrubber II (10) and an electromagnetic absorber Bai Qi (11) which are sequentially connected through pipelines; the gas outlet of the water washing tower I (6) is connected with the gas inlet of the alkaline washing tower (7), the gas outlet of the alkaline washing tower (7) is connected with the gas inlet of the electric tar precipitator (8), and the gas outlet of the electric tar precipitator (8) is connected with the tail gas inlet of the drying-solidifying integrated machine (5); a fourth conveyor belt (14) is arranged below the roller screen distributor (4), and the output end of the fourth conveyor belt (14) is in butt joint with the input end of the second conveyor belt (12); the ash outlet of the drying-consolidation integrated machine (5) is in butt joint with a fifth conveyor belt (15), the ash outlet of the bag-type dust collector (9) is in butt joint with the fifth conveyor belt (15), and the output end of the fifth conveyor belt (15) is in butt joint with the input end of the first conveyor belt (1).
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