CN108246493B - Comprehensive utilization process for reducing oil shale ash content - Google Patents
Comprehensive utilization process for reducing oil shale ash content Download PDFInfo
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- CN108246493B CN108246493B CN201810057565.1A CN201810057565A CN108246493B CN 108246493 B CN108246493 B CN 108246493B CN 201810057565 A CN201810057565 A CN 201810057565A CN 108246493 B CN108246493 B CN 108246493B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/02—General arrangement of separating plant, e.g. flow sheets specially adapted for oil-sand, oil-chalk, oil-shales, ozokerite, bitumen, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
Abstract
The invention discloses a comprehensive utilization process for reducing oil shale ash, which comprises the following steps: firstly, feeding oil shale into a crusher to be crushed and graded to obtain a fine crushed product; secondly, feeding the fine crushed product into a ball mill for ball milling to obtain a fine-grained ball-milled product; feeding the fine-grained ball-milled product into a stirring barrel, adding water into the stirring barrel, adding a medicament, and stirring and mixing slurry by using a stirrer to obtain oil shale slurry; fourthly, introducing the oil shale pulp into a flotation machine for flotation to obtain oil shale concentrate products and tailings; and fifthly, treating the oil shale concentrate product and the tailings respectively to obtain water-oil slurry and tailings. The invention carries out flotation after selective dissociation on the oil shale, enriches organic matter components in the oil shale, reduces ash content of the oil shale, prepares a water-oil slurry product, improves the utilization rate of the oil shale, reduces production energy consumption and environmental pollution, and provides high-quality raw materials for other utilization modes of oil shale deep processing.
Description
Technical Field
The invention relates to the technical field of oil shale ash reduction, in particular to a comprehensive utilization process for reducing oil shale ash.
Background
The oil shale belongs to unconventional oil and gas resources, is listed as a very important alternative energy source in the 21 st century by the feasibility of abundant resources and development and utilization, accumulates a lot of experiences in the aspects of resource conditions, main properties, mining technologies and application research in the development and utilization of the last 200 years, and becomes one of the important energy sources in the future of China from the perspective of resources and the trend of oil price. The oil shale is a high-ash energy raw material, ash-forming substances of the oil shale are a large amount of inorganic mineral components, and the part of minerals greatly improve the energy consumption of oil shale conversion and generate environmental pollution in the oil shale conversion process. Ash is a key index for distinguishing high-carbon-content oil shale from coal resources and is a parameter for measuring the quality of the oil shale; the lower this parameter, the better the quality of the oil shale.
At present, each oil shale processed by a retort type commonly used in the oil shale retorting technology needs to be improved by a great deal of research to adapt to the physical-chemical properties of the oil shale, so that the oil shale retorting technology needs a great deal of research work for the industrial production of different oil shales although the oil shale retorting technology is formed. The research on the influence factors in the dry distillation process shows that the granularity has important influence on the dry distillation process, so that the selective dissociation has an important effect on improving the dry distillation effect, and the selective dissociation can realize the enrichment of organic matter components of the oil shale under the conditions of different size fractions. To improve the adaptability of oil shale processing utilization techniques, other improved techniques are needed for further processing. In recent years, application technologies of oil shale are developed greatly, but the oil shale in different countries has large difference in main application, is mainly used for power generation, shale oil refining, fuel making, cement and building material manufacturing and the like, the oil shale has a single utilization mode, the untreated oil shale has high impurity content, a large amount of harmful gas and tailings are generated in the combustion process, and serious environmental problems are caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a comprehensive utilization process for reducing oil shale ash. The invention carries out flotation after selective dissociation on the oil shale, enriches organic matter components in the oil shale, reduces ash content of the oil shale, prepares a water-oil slurry product, improves the utilization rate of the oil shale, reduces production energy consumption and environmental pollution, provides high-quality raw materials for other utilization modes of oil shale deep processing, and has important significance for development of oil shale resources in China.
In order to achieve the purpose, the invention adopts the technical scheme that: a comprehensive utilization process for reducing oil shale ash is characterized by comprising the following steps:
step one, feeding oil shale into a crusher to be crushed to obtain a crushed product; after grading treatment is carried out on the crushed product, a coarse crushed product and a fine crushed product are obtained, the coarse crushed product is returned to the crusher to be crushed again until the coarse crushed product is crushed into the fine crushed product, and the granularity of the fine crushed product is 3-6 mm;
step two, feeding the fine crushed product obtained in the step one into a ball mill for ball milling to obtain a fine-grained ball-milled product, wherein the fine-grained ball-milled product with the granularity of less than 200 meshes accounts for 70-80% of the mass of the whole fine-grained ball-milled product;
step three, feeding the fine-grained ball-milled product obtained in the step two into a stirring barrel, and adding water into the stirring barrel to obtain mixed slurry, wherein the mass fraction of the fine-grained ball-milled product in the mixed slurry is 20% -30%; adding a medicament into the mixed slurry, and stirring and mixing the slurry by using a stirrer until the medicament is fully mixed with a fine-grained ball-milling product to obtain oil shale pulp;
the reagents are a regulator, a collector and a foaming agent, and are added in sequence according to the sequence of the regulator, the collector and the foaming agent when the reagents are added; the using amount of the regulator is 1-2 kg/t of fine-grained ball-milled products, the using amount of the collecting agent is 0.5-1.2 kg/t of fine-grained ball-milled products, and the using amount of the foaming agent is 0.2-0.8 kg/t of fine-grained ball-milled products;
step four, introducing the oil shale ore pulp obtained in the step three into a flotation machine for flotation to obtain a foam product and an ore pulp product, wherein the foam product is an oil shale concentrate product, and the ore pulp product is a tailing mineral;
step five, respectively treating the oil shale concentrate product and the tailings obtained in the step four, wherein the treatment process of the oil shale concentrate product is as follows: feeding the oil shale concentrate product into a stirring barrel, adding an additive, and stirring by using a stirrer to prepare a final product, namely water-oil slurry, wherein the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 50-65%; the treatment process of the tail minerals comprises the following steps: and (4) dehydrating the tailings to obtain tailings.
The comprehensive utilization process for reducing the ash content of the oil shale is characterized by comprising the following steps of: in the fifth step, the weight of the additive is 0.2-1% of the weight of the dry oil shale concentrate product, and the additive is prepared from the following raw materials in percentage by mass: 40-70% of dispersing agent and 30-60% of stabilizing agent.
The comprehensive utilization process for reducing the ash content of the oil shale is characterized by comprising the following steps of: the weight of the additive is 0.6% of the weight of the dry oil shale concentrate product.
The comprehensive utilization process for reducing the ash content of the oil shale is characterized by comprising the following steps of: the dispersing agent is 50 percent, the stabilizing agent is 50 percent, the dispersing agent is sodium lignosulfonate, and the stabilizing agent is sodium hexametaphosphate.
The comprehensive utilization process for reducing the ash content of the oil shale is characterized by comprising the following steps of: the particle size of the finely crushed product in the first step is 5 mm.
The comprehensive utilization process for reducing the ash content of the oil shale is characterized by comprising the following steps of: and in the second step, the fine-grained ball-milled products with the granularity of less than 200 meshes account for 75% of the mass of the whole fine-grained ball-milled products.
The comprehensive utilization process for reducing the ash content of the oil shale is characterized by comprising the following steps of: and step three, the mass fraction of the fine-fraction ball-milled product in the mixed slurry is 25%.
The comprehensive utilization process for reducing the ash content of the oil shale is characterized by comprising the following steps of: in the third step, the dosage of the regulator is 1.5kg/t of fine-grained ball-milled product, the dosage of the collector is 0.85kg/t of fine-grained ball-milled product, and the dosage of the foaming agent is 0.5kg/t of fine-grained ball-milled product; the modifier is water glass, the collector is kerosene or kerosene, and the foaming agent is sec-octanol.
The comprehensive utilization process for reducing the ash content of the oil shale is characterized by comprising the following steps of: and fifthly, the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 55%.
The comprehensive utilization process for reducing the ash content of the oil shale is characterized by comprising the following steps of: the dry oil shale concentrate product is obtained by taking a small amount of oil shale concentrate product, measuring the concentration of the oil shale concentrate product and then performing quality conversion.
Compared with the prior art, the invention has the following advantages:
1. the invention provides a comprehensive utilization process for reducing oil shale ash, which is used for reducing the oil shale product ash to prepare a water-oil slurry product, and provides a new way for the comprehensive utilization of oil shale.
2. According to the invention, the ash reduction rate of flotation is 50-62.5%, the impurity content of the product after flotation is reduced, SOx and NOx and other products generated in the pyrolysis or gasification process can be reduced, and the atmospheric pollution is reduced.
3. According to the comprehensive utilization process for reducing the ash content of the oil shale, the prepared water-oil slurry product has a stable period of more than one month, and has a fluid viscosity of 0.80 Pa.s and good fluidity when the temperature is about 20 ℃, namely the water-oil slurry product can be transported like an oil liquid product, so that the environmental pollution generated in the transportation process can be reduced; in addition, the water-oil slurry product can be used as an oil product and can also be used as a gasification raw material.
4. The invention carries out flotation after selective dissociation on the oil shale, enriches organic matter components in the oil shale, provides high-quality raw materials for other utilization modes of oil shale deep processing, improves the utilization rate of the oil shale, reduces impurity energy consumption in the utilization process, reduces the pollution of impurity minerals to the environment in the processing and utilization process, and promotes the further development of unconventional energy application of the oil shale and the like in China.
5. The invention has simple process, less investment, easy operation and strong applicability.
In conclusion, the invention researches the flotation separation of the oil shale in the dissociation state to obtain the low-ash oil shale product aiming at the importance of the ash influence in the oil shale processing and utilizing technology, the serious environmental pollution in the combustion process and the single treatment method. By reducing the ash content of the oil shale, the conversion rate of the oil shale for preparing the shale oil can be improved, the energy consumption and the environmental pollution in the conversion process can be reduced, and a new utilization means can be developed according to the property of the low-ash oil shale product.
The technical solution of the present invention is further described in detail by the following examples.
Detailed Description
Example 1
The comprehensive utilization process for reducing the ash content of the oil shale comprises the following steps of:
step one, feeding oil shale into a crusher to be crushed to obtain a crushed product; after grading treatment is carried out on the crushed product, a coarse crushed product and a fine crushed product are obtained, the coarse crushed product is returned to the crusher to be crushed again until the coarse crushed product is crushed into the fine crushed product, and the granularity of the fine crushed product is 5 mm;
step two, feeding the fine crushed product obtained in the step one into a ball mill for ball milling to obtain a fine-grained ball-milled product, wherein the fine-grained ball-milled product with the granularity of less than 200 meshes accounts for 75% of the mass of the whole fine-grained ball-milled product;
step three, feeding the fine-grained ball-milled product obtained in the step two into a stirring barrel, and adding water into the stirring barrel to obtain mixed slurry, wherein the mass fraction of the fine-grained ball-milled product in the mixed slurry is 25%; adding a medicament into the mixed slurry, and stirring and mixing the slurry by using a stirrer until the medicament is fully mixed with a fine-grained ball-milling product to obtain oil shale pulp;
the reagents are a regulator, a collector and a foaming agent, and are added in sequence according to the sequence of the regulator, the collector and the foaming agent when the reagents are added; the using amount of the regulator is 1.5kg/t of fine-grained ball-milled products, the using amount of the collector is 0.85kg/t of fine-grained ball-milled products, and the using amount of the foaming agent is 0.5kg/t of fine-grained ball-milled products;
step four, introducing the oil shale ore pulp obtained in the step three into a flotation machine for flotation to obtain a foam product and an ore pulp product, wherein the foam product is an oil shale concentrate product, and the ore pulp product is a tailing mineral;
step five, respectively treating the oil shale concentrate product and the tailings obtained in the step four, wherein the treatment process of the oil shale concentrate product is as follows: feeding the oil shale concentrate product into a stirring barrel, adding an additive, and stirring by using a stirrer to prepare a final product, namely water-oil slurry, wherein the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 55%; the treatment process of the tail minerals comprises the following steps: and (4) dehydrating the tailings to obtain tailings.
In this embodiment, the weight of the additive is 0.6% of the weight of the dry oil shale concentrate product, and the additive is prepared from the following raw materials in percentage by mass: 50% of dispersing agent and 50% of stabilizing agent.
In this embodiment, the dry oil shale concentrate product is obtained by taking a small amount of oil shale concentrate product, measuring the concentration of the oil shale concentrate product, and performing mass conversion.
Example 2
The comprehensive utilization process for reducing the ash content of the oil shale comprises the following steps of:
step one, feeding oil shale into a crusher to be crushed to obtain a crushed product; after grading treatment is carried out on the crushed product, a coarse crushed product and a fine crushed product are obtained, the coarse crushed product is returned to the crusher to be crushed again until the coarse crushed product is crushed into the fine crushed product, and the granularity of the fine crushed product is 3 mm;
step two, feeding the fine crushed product obtained in the step one into a ball mill for ball milling to obtain a fine-grained ball-milled product, wherein the fine-grained ball-milled product with the granularity of less than 200 meshes accounts for 78% of the mass of the whole fine-grained ball-milled product;
step three, feeding the fine-grained ball-milled product obtained in the step two into a stirring barrel, and adding water into the stirring barrel to obtain mixed slurry, wherein the mass fraction of the fine-grained ball-milled product in the mixed slurry is 22%; adding a medicament into the mixed slurry, and stirring and mixing the slurry by using a stirrer until the medicament is fully mixed with a fine-grained ball-milling product to obtain oil shale pulp;
the reagents are a regulator, a collector and a foaming agent, and are added in sequence according to the sequence of the regulator, the collector and the foaming agent when the reagents are added; the using amount of the regulator is 1kg/t of fine-grained ball-milled products, the using amount of the collector is 0.5kg/t of fine-grained ball-milled products, and the using amount of the foaming agent is 0.8kg/t of fine-grained ball-milled products;
step four, introducing the oil shale ore pulp obtained in the step three into a flotation machine for flotation to obtain a foam product and an ore pulp product, wherein the foam product is an oil shale concentrate product, and the ore pulp product is a tailing mineral;
step five, respectively treating the oil shale concentrate product and the tailings obtained in the step four, wherein the treatment process of the oil shale concentrate product is as follows: feeding the oil shale concentrate product into a stirring barrel, adding an additive, and stirring by using a stirrer to prepare a final product, namely water-oil slurry, wherein the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 65%; the treatment process of the tail minerals comprises the following steps: and (4) dehydrating the tailings to obtain tailings.
In this embodiment, the weight of the additive is 0.2% of the weight of the dry oil shale concentrate product, and the additive is prepared from the following raw materials in percentage by mass: 70% of dispersing agent and 30% of stabilizing agent.
In this embodiment, the dry oil shale concentrate product is obtained by taking a small amount of oil shale concentrate product, measuring the concentration of the oil shale concentrate product, and performing mass conversion.
Example 3
The comprehensive utilization process for reducing the ash content of the oil shale comprises the following steps of:
step one, feeding oil shale into a crusher to be crushed to obtain a crushed product; after grading treatment is carried out on the crushed product, a coarse crushed product and a fine crushed product are obtained, the coarse crushed product is returned to the crusher to be crushed again until the coarse crushed product is crushed into the fine crushed product, and the granularity of the fine crushed product is 5 mm;
step two, feeding the fine crushed product obtained in the step one into a ball mill for ball milling to obtain a fine-grained ball-milled product, wherein the fine-grained ball-milled product with the granularity of less than 200 meshes accounts for 80% of the mass of the whole fine-grained ball-milled product;
step three, feeding the fine-grained ball-milled product obtained in the step two into a stirring barrel, and adding water into the stirring barrel to obtain mixed slurry, wherein the mass fraction of the fine-grained ball-milled product in the mixed slurry is 26%; adding a medicament into the mixed slurry, and stirring and mixing the slurry by using a stirrer until the medicament is fully mixed with a fine-grained ball-milling product to obtain oil shale pulp;
the reagents are a regulator, a collector and a foaming agent, and are added in sequence according to the sequence of the regulator, the collector and the foaming agent when the reagents are added; the using amount of the regulator is 1.6kg/t of fine-grained ball-milled products, the using amount of the collector is 1kg/t of fine-grained ball-milled products, and the using amount of the foaming agent is 0.6kg/t of fine-grained ball-milled products;
step four, introducing the oil shale ore pulp obtained in the step three into a flotation machine for flotation to obtain a foam product and an ore pulp product, wherein the foam product is an oil shale concentrate product, and the ore pulp product is a tailing mineral;
step five, respectively treating the oil shale concentrate product and the tailings obtained in the step four, wherein the treatment process of the oil shale concentrate product is as follows: feeding the oil shale concentrate product into a stirring barrel, adding an additive, and stirring by using a stirrer to prepare a final product, namely water-oil slurry, wherein the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 52%; the treatment process of the tail minerals comprises the following steps: and (4) dehydrating the tailings to obtain tailings.
In this embodiment, the weight of the additive is 0.4% of the weight of the dry oil shale concentrate product, and the additive is prepared from the following raw materials in percentage by mass: 45% of dispersing agent and 55% of stabilizing agent.
In this embodiment, the dry oil shale concentrate product is obtained by taking a small amount of oil shale concentrate product, measuring the concentration of the oil shale concentrate product, and performing mass conversion.
Example 4
The comprehensive utilization process for reducing the ash content of the oil shale comprises the following steps of:
step one, feeding oil shale into a crusher to be crushed to obtain a crushed product; after grading treatment is carried out on the crushed product, a coarse crushed product and a fine crushed product are obtained, the coarse crushed product is returned to the crusher to be crushed again until the coarse crushed product is crushed into the fine crushed product, and the granularity of the fine crushed product is 4 mm;
step two, feeding the fine crushed product obtained in the step one into a ball mill for ball milling to obtain a fine-grained ball-milled product, wherein the fine-grained ball-milled product with the granularity of less than 200 meshes accounts for 70% of the mass of the whole fine-grained ball-milled product;
step three, feeding the fine-grained ball-milled product obtained in the step two into a stirring barrel, and adding water into the stirring barrel to obtain mixed slurry, wherein the mass fraction of the fine-grained ball-milled product in the mixed slurry is 20%; adding a medicament into the mixed slurry, and stirring and mixing the slurry by using a stirrer until the medicament is fully mixed with a fine-grained ball-milling product to obtain oil shale pulp;
the reagents are a regulator, a collector and a foaming agent, and are added in sequence according to the sequence of the regulator, the collector and the foaming agent when the reagents are added; the using amount of the regulator is 1.5kg/t of fine-grained ball-milled products, the using amount of the collector is 0.85kg/t of fine-grained ball-milled products, and the using amount of the foaming agent is 0.5kg/t of fine-grained ball-milled products;
step four, introducing the oil shale ore pulp obtained in the step three into a flotation machine for flotation to obtain a foam product and an ore pulp product, wherein the foam product is an oil shale concentrate product, and the ore pulp product is a tailing mineral;
step five, respectively treating the oil shale concentrate product and the tailings obtained in the step four, wherein the treatment process of the oil shale concentrate product is as follows: feeding the oil shale concentrate product into a stirring barrel, adding an additive, and stirring by using a stirrer to prepare a final product, namely water-oil slurry, wherein the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 55%; the treatment process of the tail minerals comprises the following steps: and (4) dehydrating the tailings to obtain tailings.
In this embodiment, the weight of the additive is 0.6% of the weight of the dry oil shale concentrate product, and the additive is prepared from the following raw materials in percentage by mass: 60% of dispersing agent and 40% of stabilizing agent.
In this embodiment, the dry oil shale concentrate product is obtained by taking a small amount of oil shale concentrate product, measuring the concentration of the oil shale concentrate product, and performing mass conversion.
Example 5
The comprehensive utilization process for reducing the ash content of the oil shale comprises the following steps of:
step one, feeding oil shale into a crusher to be crushed to obtain a crushed product; after grading treatment is carried out on the crushed product, a coarse crushed product and a fine crushed product are obtained, the coarse crushed product is returned to the crusher to be crushed again until the coarse crushed product is crushed into the fine crushed product, and the granularity of the fine crushed product is 6 mm;
step two, feeding the fine crushed product obtained in the step one into a ball mill for ball milling to obtain a fine-grained ball-milled product, wherein the fine-grained ball-milled product with the granularity of less than 200 meshes accounts for 72% of the mass of the whole fine-grained ball-milled product;
step three, feeding the fine-grained ball-milled product obtained in the step two into a stirring barrel, and adding water into the stirring barrel to obtain mixed slurry, wherein the mass fraction of the fine-grained ball-milled product in the mixed slurry is 24%; adding a medicament into the mixed slurry, and stirring and mixing the slurry by using a stirrer until the medicament is fully mixed with a fine-grained ball-milling product to obtain oil shale pulp;
the reagents are a regulator, a collector and a foaming agent, and are added in sequence according to the sequence of the regulator, the collector and the foaming agent when the reagents are added; the using amount of the regulator is 1kg/t of fine-grained ball-milled product, the using amount of the collector is 0.9kg/t of fine-grained ball-milled product, and the using amount of the foaming agent is 0.7kg/t of fine-grained ball-milled product;
step four, introducing the oil shale ore pulp obtained in the step three into a flotation machine for flotation to obtain a foam product and an ore pulp product, wherein the foam product is an oil shale concentrate product, and the ore pulp product is a tailing mineral;
step five, respectively treating the oil shale concentrate product and the tailings obtained in the step four, wherein the treatment process of the oil shale concentrate product is as follows: feeding the oil shale concentrate product into a stirring barrel, adding an additive, and stirring by using a stirrer to prepare a final product, namely water-oil slurry, wherein the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 58%; the treatment process of the tail minerals comprises the following steps: and (4) dehydrating the tailings to obtain tailings.
In this embodiment, the weight of the additive is 0.8% of the weight of the dry oil shale concentrate product, and the additive is prepared from the following raw materials in percentage by mass: 62% of dispersing agent and 38% of stabilizing agent.
In this embodiment, the dry oil shale concentrate product is obtained by taking a small amount of oil shale concentrate product, measuring the concentration of the oil shale concentrate product, and performing mass conversion.
Example 6
The comprehensive utilization process for reducing the ash content of the oil shale comprises the following steps of:
step one, feeding oil shale into a crusher to be crushed to obtain a crushed product; after grading treatment is carried out on the crushed product, a coarse crushed product and a fine crushed product are obtained, the coarse crushed product is returned to the crusher to be crushed again until the coarse crushed product is crushed into the fine crushed product, and the granularity of the fine crushed product is 3 mm;
step two, feeding the fine crushed product obtained in the step one into a ball mill for ball milling to obtain a fine-grained ball-milled product, wherein the fine-grained ball-milled product with the granularity of less than 200 meshes accounts for 86% of the mass of the whole fine-grained ball-milled product;
step three, feeding the fine-grained ball-milled product obtained in the step two into a stirring barrel, and adding water into the stirring barrel to obtain mixed slurry, wherein the mass fraction of the fine-grained ball-milled product in the mixed slurry is 25%; adding a medicament into the mixed slurry, and stirring and mixing the slurry by using a stirrer until the medicament is fully mixed with a fine-grained ball-milling product to obtain oil shale pulp;
the reagents are a regulator, a collector and a foaming agent, and are added in sequence according to the sequence of the regulator, the collector and the foaming agent when the reagents are added; the using amount of the regulator is 2kg/t of fine-grained ball-milled products, the using amount of the collector is 0.85kg/t of fine-grained ball-milled products, and the using amount of the foaming agent is 0.5kg/t of fine-grained ball-milled products;
step four, introducing the oil shale ore pulp obtained in the step three into a flotation machine for flotation to obtain a foam product and an ore pulp product, wherein the foam product is an oil shale concentrate product, and the ore pulp product is a tailing mineral;
step five, respectively treating the oil shale concentrate product and the tailings obtained in the step four, wherein the treatment process of the oil shale concentrate product is as follows: feeding the oil shale concentrate product into a stirring barrel, adding an additive, and stirring by using a stirrer to prepare a final product, namely water-oil slurry, wherein the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 55%; the treatment process of the tail minerals comprises the following steps: and (4) dehydrating the tailings to obtain tailings.
In this embodiment, the weight of the additive is 0.7% of the weight of the dry oil shale concentrate product, and the additive is prepared from the following raw materials in percentage by mass: 55% of dispersing agent and 45% of stabilizing agent.
In this embodiment, the dry oil shale concentrate product is obtained by taking a small amount of oil shale concentrate product, measuring the concentration of the oil shale concentrate product, and performing mass conversion.
Example 7
The comprehensive utilization process for reducing the ash content of the oil shale comprises the following steps of:
step one, feeding oil shale into a crusher to be crushed to obtain a crushed product; after grading treatment is carried out on the crushed product, a coarse crushed product and a fine crushed product are obtained, the coarse crushed product is returned to the crusher to be crushed again until the coarse crushed product is crushed into the fine crushed product, and the granularity of the fine crushed product is 5 mm;
step two, feeding the fine crushed product obtained in the step one into a ball mill for ball milling to obtain a fine-grained ball-milled product, wherein the fine-grained ball-milled product with the granularity of less than 200 meshes accounts for 80% of the mass of the whole fine-grained ball-milled product;
step three, feeding the fine-grained ball-milled product obtained in the step two into a stirring barrel, and adding water into the stirring barrel to obtain mixed slurry, wherein the mass fraction of the fine-grained ball-milled product in the mixed slurry is 28%; adding a medicament into the mixed slurry, and stirring and mixing the slurry by using a stirrer until the medicament is fully mixed with a fine-grained ball-milling product to obtain oil shale pulp;
the reagents are a regulator, a collector and a foaming agent, and are added in sequence according to the sequence of the regulator, the collector and the foaming agent when the reagents are added; the using amount of the regulator is 1.8kg/t of fine-grained ball-milled products, the using amount of the collector is 0.7kg/t of fine-grained ball-milled products, and the using amount of the foaming agent is 0.2kg/t of fine-grained ball-milled products;
step four, introducing the oil shale ore pulp obtained in the step three into a flotation machine for flotation to obtain a foam product and an ore pulp product, wherein the foam product is an oil shale concentrate product, and the ore pulp product is a tailing mineral;
step five, respectively treating the oil shale concentrate product and the tailings obtained in the step four, wherein the treatment process of the oil shale concentrate product is as follows: feeding the oil shale concentrate product into a stirring barrel, adding an additive, and stirring by using a stirrer to prepare a final product, namely water-oil slurry, wherein the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 62%; the treatment process of the tail minerals comprises the following steps: and (4) dehydrating the tailings to obtain tailings.
In this embodiment, the weight of the additive is 1% of the weight of the dry oil shale concentrate product, and the additive is prepared from the following raw materials in percentage by mass: 65% of dispersing agent and 35% of stabilizing agent.
In this embodiment, the dry oil shale concentrate product is obtained by taking a small amount of oil shale concentrate product, measuring the concentration of the oil shale concentrate product, and performing mass conversion.
Example 8
The comprehensive utilization process for reducing the ash content of the oil shale comprises the following steps of:
step one, feeding oil shale into a crusher to be crushed to obtain a crushed product; after grading treatment is carried out on the crushed product, a coarse crushed product and a fine crushed product are obtained, the coarse crushed product is returned to the crusher to be crushed again until the coarse crushed product is crushed into the fine crushed product, and the granularity of the fine crushed product is 6 mm;
step two, feeding the fine crushed product obtained in the step one into a ball mill for ball milling to obtain a fine-grained ball-milled product, wherein the fine-grained ball-milled product with the granularity of less than 200 meshes accounts for 75% of the mass of the whole fine-grained ball-milled product;
step three, feeding the fine-grained ball-milled product obtained in the step two into a stirring barrel, and adding water into the stirring barrel to obtain mixed slurry, wherein the mass fraction of the fine-grained ball-milled product in the mixed slurry is 30%; adding a medicament into the mixed slurry, and stirring and mixing the slurry by using a stirrer until the medicament is fully mixed with a fine-grained ball-milling product to obtain oil shale pulp;
the reagents are a regulator, a collector and a foaming agent, and are added in sequence according to the sequence of the regulator, the collector and the foaming agent when the reagents are added; the using amount of the regulator is 1.5kg/t of fine-grained ball-milled products, the using amount of the collector is 1.2kg/t of fine-grained ball-milled products, and the using amount of the foaming agent is 0.5kg/t of fine-grained ball-milled products;
step four, introducing the oil shale ore pulp obtained in the step three into a flotation machine for flotation to obtain a foam product and an ore pulp product, wherein the foam product is an oil shale concentrate product, and the ore pulp product is a tailing mineral;
step five, respectively treating the oil shale concentrate product and the tailings obtained in the step four, wherein the treatment process of the oil shale concentrate product is as follows: feeding the oil shale concentrate product into a stirring barrel, adding an additive, and stirring by using a stirrer to prepare a final product, namely water-oil slurry, wherein the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 50%; the treatment process of the tail minerals comprises the following steps: and (4) dehydrating the tailings to obtain tailings.
In this embodiment, the weight of the additive is 0.6% of the weight of the dry oil shale concentrate product, and the additive is prepared from the following raw materials in percentage by mass: 40% of dispersing agent and 60% of stabilizing agent.
In this embodiment, the dry oil shale concentrate product is obtained by taking a small amount of oil shale concentrate product, measuring the concentration of the oil shale concentrate product, and performing mass conversion.
The comprehensive utilization process for reducing the ash content of the oil shale provided by the above embodiments 1 to 8 can reduce the ash content of the oil shale to about 15% to 20%, and compared with about 40% of the ash content of the crude oil shale, the ash reduction rate reaches 50% to 62.5%; the oil shale concentrate product is used for preparing water-oil slurry, and the ash content does not participate in direct pyrolysis or gasification reaction but consumes reaction heat, so that the reduction of the ash content of the oil shale can effectively improve the utilization rate of the oil shale and reduce the heat consumption in the conversion process. The oil shale conversion rate is improved by 0.2 to 0.3 percent and the oxygen consumption rate is reduced by 0.6 to 0.7 percent for every 1 percent of the ash content. The water-oil slurry product has a stable period of more than 1 month, and has a fluid viscosity of 0.80 Pa.s and good fluidity at about 20 ℃, namely the water-oil slurry product can be transported like an oil liquid product.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. A comprehensive utilization process for reducing oil shale ash is characterized by comprising the following steps:
step one, feeding oil shale into a crusher to be crushed to obtain a crushed product; after grading treatment is carried out on the crushed product, a coarse crushed product and a fine crushed product are obtained, the coarse crushed product is returned to the crusher to be crushed again until the coarse crushed product is crushed into the fine crushed product, and the granularity of the fine crushed product is 3-6 mm;
step two, feeding the fine crushed product obtained in the step one into a ball mill for ball milling to obtain a fine-grained ball-milled product, wherein the fine-grained ball-milled product with the granularity of less than 200 meshes accounts for 70-80% of the mass of the whole fine-grained ball-milled product;
step three, feeding the fine-grained ball-milled product obtained in the step two into a stirring barrel, and adding water into the stirring barrel to obtain mixed slurry, wherein the mass fraction of the fine-grained ball-milled product in the mixed slurry is 20% -30%; adding a medicament into the mixed slurry, and stirring and mixing the slurry by using a stirrer until the medicament is fully mixed with a fine-grained ball-milling product to obtain oil shale pulp;
the reagents are a regulator, a collector and a foaming agent, and are added in sequence according to the sequence of the regulator, the collector and the foaming agent when the reagents are added; the using amount of the regulator is 1.5kg/t of fine-grained ball-milled products, the using amount of the collector is 0.85kg/t of fine-grained ball-milled products, and the using amount of the foaming agent is 0.5kg/t of fine-grained ball-milled products; the regulator is water glass, the collector is kerosene, and the foaming agent is sec-octanol;
step four, introducing the oil shale ore pulp obtained in the step three into a flotation machine for flotation to obtain a foam product and an ore pulp product, wherein the foam product is an oil shale concentrate product, and the ore pulp product is a tailing mineral;
step five, respectively treating the oil shale concentrate product and the tailings obtained in the step four, wherein the treatment process of the oil shale concentrate product is as follows: feeding the oil shale concentrate product into a stirring barrel, adding an additive, and stirring by using a stirrer to prepare a final product, namely water-oil slurry, wherein the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 50-65%; the treatment process of the tail minerals comprises the following steps: dehydrating the tailings to obtain tailings;
the weight of the additive is 0.2-1% of the weight of the dry oil shale concentrate product, and the additive is prepared from the following raw materials in percentage by mass: 50% of dispersing agent and 50% of stabilizing agent, wherein the dispersing agent is sodium lignosulfonate, and the stabilizing agent is sodium hexametaphosphate.
2. The comprehensive utilization process for reducing the ash content of oil shale according to claim 1, characterized in that: the weight of the additive is 0.6% of the weight of the dry oil shale concentrate product.
3. The comprehensive utilization process for reducing the ash content of oil shale according to claim 1, characterized in that: the particle size of the finely crushed product in the first step is 5 mm.
4. The comprehensive utilization process for reducing the ash content of oil shale according to claim 1, characterized in that: and in the second step, the fine-grained ball-milled products with the granularity of less than 200 meshes account for 75% of the mass of the whole fine-grained ball-milled products.
5. The comprehensive utilization process for reducing the ash content of oil shale according to claim 1, characterized in that: and step three, the mass fraction of the fine-fraction ball-milled product in the mixed slurry is 25%.
6. The comprehensive utilization process for reducing the ash content of oil shale according to claim 1, characterized in that: and fifthly, the mass fraction of the dry oil shale concentrate product in the water-oil slurry is 55%.
7. The comprehensive utilization process for reducing the ash content of the oil shale as claimed in claim 1, 2 or 3, wherein: the dry oil shale concentrate product is obtained by taking a small amount of oil shale concentrate product, measuring the concentration of the oil shale concentrate product and then performing quality conversion.
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