Method for manufacturing common insulated riser bush instead of floating bead riser bush from organic silicon slag compound powder

Abstract

The invention discloses a method for manufacturing a common insulated riser bush instead of a floating bead riser bush by using organic silicon slag compound powder, and relates to the technical field of casting materials, the method comprises the following steps: S1, preparing silicon-based compound powder; s2, mixing treatment; and S3, demolding and drying. According to the invention, silicon slag solid waste obtained after hydrolysis of element slag slurry of an organosilicon enterprise is treated into nontoxic solid waste, the solid waste is treated, and a part of refractory material and an auxiliary agent are further added to prepare a heat-insulating refractory material used for a heat-insulating riser bush in the casting industry, namely the organosilicon slag compound powder; the silicon-based compound powder regenerated by using the organic silicon slag has better thermal insulation performance and heating performance, can be used for manufacturing a thermal insulation riser sleeve for replacing a floating bead, achieves or even exceeds the effect of the floating bead thermal insulation riser sleeve, and can be used for replacing the floating bead riser sleeve, so that the energy consumption, pollution and manufacturing cost of the artificial floating bead are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of casting materials, in particular to a method for producing a common thermal insulation riser sleeve instead of a floating bead riser sleeve by mixing organic silicon slag compound powder. Background Art

[0002] Riser sleeves can be divided into heat-insulating riser sleeves and ordinary insulation riser sleeves. The insulation material in ordinary insulation riser sleeves is mainly floating beads, which are widely used due to their excellent thermal insulation performance and are particularly suitable for steel castings. However, natural floating beads come from fly ash in thermal power plants, and artificial floating beads also have high energy consumption, high pollution, and increasingly high costs. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for making ordinary thermal insulation riser sleeves instead of floating bead riser sleeves using organic silicon slag compound powder, so as to solve the problem proposed in the above background technology that natural floating beads come from fly ash in thermal power plants, and artificial floating beads also have high energy consumption, large pollution and increasingly high cost.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for making an ordinary thermal insulation riser sleeve instead of a floating bead riser sleeve using a compound powder of organic silicon slag, comprising the following steps:

[0005] S1. Preparation of silicon-based composite powder: Pre-treated organosilicon slag is mixed with mullite and an additive containing lithium oxide to form a silicon-based composite powder, which is made from the following raw materials in parts by weight: 20% to 36% elemental silicon, 1% to 12% free carbon, 0.5% to 6% sodium chloride, 35% to 40% mullite, and 5% to 6% additive;

[0006] S2. Mixing treatment: add white bleached beads, quartz powder or mullite to the silicon-based compound powder, dry mix for 5 to 10 minutes, then add 15% to 17% of water glass with a modulus of 2.8-3.0, mix and stir evenly;

[0007] S3, demoulding and drying: the mixed materials in S2 are loaded into a mold and compacted, demoulded, and a riser sleeve is obtained. The riser sleeve is dried in a dryer or placed for 120 hours, and then the dry strength, gas emission and air permeability are tested to determine whether the riser sleeve production is qualified.

[0008] Preferably, the organosilicon slag in S1 has a silicon content of 40% to 60%, free carbon of 2% to 20%, sodium chloride of 1% to 10%, and a moisture content of 15% to 30%.

[0009] Preferably, in S1, the silicon-based compound powder is neutral to alkaline, with a pH of 7-8.5.

[0010] Preferably, in S1, the silicon-based composite powder has a high calorific value of 2500-3000 cal / g on a dry basis, a particle size distribution of 30-200 meshes, and the additive is a mixed material made of lepidolite and spodumene materials with a lithium oxide content of 1% to 2%, and is calcined at 1350 degrees.

[0011] Preferably, in S2, the silicon-based compound powder accounts for 30% to 45%, the white bleached beads account for 10% to 15%, and the quartz powder or mullite accounts for 40% to 50%.

[0012] Preferably, in S2, the water glass is sodium silicate stock solution water glass, the modulus is 2.8-3.0, and the quartz powder / mullite particle size is 30-70 mesh.

[0013] Preferably, in S3, the wet strength of the riser sleeve before drying is 0.3-0.5.

[0014] Preferably, in S3, the drying temperature of the dryer is 100°-120°, and the drying time is 2h-3h.

[0015] Preferably, in S3, the dry strength of the riser sleeve is 1.5-2.2 Map, the gas generation volume is 50-70 ml / g, and the air permeability is 150-320.

[0016] The present invention also provides an application of the method for preparing common thermal insulation riser sleeves instead of floating bead riser sleeves by using the organic silicon slag compound powder as described in any one of the above items in the preparation of coated sand.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the present invention, silicon slag solid waste obtained after hydrolysis of the original slag slurry of an organosilicon enterprise is treated to become non-toxic solid waste. Through the treatment of the solid waste, some refractory materials and additives are further added to make a thermal insulation refractory material for thermal insulation riser sleeves used in the foundry industry, namely, organosilicon slag compound powder. The silicon-based compound powder regenerated from the organosilicon slag has good thermal insulation and heat generation properties, and can be used to manufacture thermal insulation riser sleeves that replace floating beads, achieving or even exceeding the effect of floating bead thermal insulation riser sleeves, and can replace the use of floating bead riser sleeves, thereby reducing the energy consumption, pollution and manufacturing costs of artificial floating beads. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention provides a flow chart of a method for producing common thermal insulation riser sleeves instead of floating bead riser sleeves using a compound powder of organic silicon slag. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] Example 1: Reference Figure 1 As shown: A method for making ordinary insulating riser sleeves instead of floating bead riser sleeves by using organic silicon slag compound powder. To address the problem that traditional floating bead insulating riser sleeves rely on high-energy-consuming and highly polluting natural / artificial floating beads, organic silicon industry solid waste (silicon slag) is used as the core raw material. Through the three-in-one technical route of component compound optimization-process molding control-performance equivalent substitution, an environmentally friendly and low-cost insulating riser sleeve preparation system is constructed.

[0022] Dimensional analysis of technical principles

[0023] (1) Principle of solid waste resource utilization: value transformation of organosilicon slag

[0024] Solid waste composition adaptability

[0025] Silicone slag is rich in elemental silicon (resistant to high temperatures, melting point 1414°C, providing skeleton support), free carbon (low thermal conductivity, enhanced thermal insulation), and sodium chloride (regulating sintering characteristics and improving inter-particle bonding). Its physical and chemical properties are highly compatible with the requirements of thermal insulation materials for casting.

[0026] The moisture content is removed by drying, and the residual moisture helps disperse the particles during the molding stage to avoid dust pollution from the fully dried material.

[0027] Harmless treatment of solid waste

[0028] Through pre-treatment processes such as hydrolysis slurry washing, screening and impurity removal, residual acid (such as hydrochloric acid) and heavy metals are removed to ensure that the compound powder is neutral to alkaline, suitable for water glass binder and non-corrosive.

[0029] (2) Principle of component collaborative design: superposition of multi-component performance

[0030] Thermal insulation function construction

[0031] Core insulation components:

[0032] The free carbon in the organosilicon slag forms a porous insulation network with the white bleaching beads, blocking heat conduction (thermal conductivity ≤ 0.2W / (m·K), close to the 0.18W / (m·K) of bleaching beads);

[0033] Mullite and quartz powder provide a high-temperature resistant skeleton to prevent the riser sleeve from softening and deforming during molten steel pouring.

[0034] Heating performance adjustment:

[0035] The oxidation reaction of elemental silicon and free carbon provides continuous micro-heat, slowing down the heat dissipation speed of the riser sleeve and extending the shrinkage feeding time of molten steel, thus achieving the dual effects of "heat preservation + micro-heating".

[0036] Bonding and molding principles

[0037] Water glass bonding mechanism:

[0038] Water glass (sodium silicate solution) is hydrolyzed to form silica gel (SiO2·nH2O), which wraps the compound powder and quartz powder particles. It gradually hardens through water evaporation and CO2 absorption at room temperature. After drying, it forms a silicon-oxygen bond network structure, which gives the riser sleeve dry strength and impact resistance.

[0039] Catalytic effect of additives:

[0040] The lithium oxide additive (lepidolite / spodumene calcined product) reduces the hardening temperature of water glass, promotes the rapid precipitation of silica gel, and adjusts the melting characteristics of the compound powder at the same time, so that the riser sleeve forms a U-shaped shrinkage cavity in the later stage of molten steel cooling, optimizing the shrinkage channel.

[0041] (3) Process molding control principle: precise control from mixing to performance

[0042] Ensure uniformity of mixing process

[0043] Dry mixing stage: Use a forced convection mixer (such as a plowshare mixer) to optimize the particle size distribution, ensure uniform dispersion of elemental silicon and white bleaching beads, and avoid local uneven heat conduction;

[0044] Wet mixing stage: Water glass acts as a bridge to mix particles of different densities (silicon slag 2.3g / cm 3 , floating beads 0.8g / cm 3 ) are bonded into stable masses, and the wet strength meets the demoulding requirements.

[0045] Density control during molding and drying

[0046] Compaction process:

[0047] Large-sized riser sleeves are formed by vibration compaction and half mold (to avoid loose corners), while small-sized ones are injected by core shooting machine under high pressure (one mold, multiple shapes, efficiency increased by 3 times), controlling porosity and balancing permeability and strength.

[0048] Tumble dry low:

[0049] Only free water is removed, and chemically bound water of water glass is retained, which avoids dehydration and cracking of silica gel caused by high temperature, while inhibiting the volatilization of organic impurities.

[0050] (IV) Performance substitution and defect suppression principle

[0051] Equivalence of feeding effect

[0052] The low thermal conductivity and appropriate heat generation of the compound powder extend the solidification time of the molten steel inside the riser sleeve by 8 minutes compared with the traditional float bead sleeve, increase the shrinkage feeding distance by 10%, and reduce the shrinkage rate of the casting from 0.8% to below 0.5%;

[0053] The U-shaped shrinkage shape ensures that the riser neck solidifies last, forming a natural shrinkage channel and reducing sand sticking defects before cutting.

[0054] Defect suppression mechanism

[0055] Porosity control: Strictly control the residual organic matter in the silicone slag (through pickling and degreasing) and the thoroughness of drying to reduce the amount of gas generated. Combined with air permeability, ensure that the gas in the mold is discharged in time during pouring;

[0056] Strength guarantee: The bonding network of mullite and water glass provides structural support, and the dry strength meets the impact of lifting and pouring.

[0057] (V) Key to the implementation of technical principles

[0058] Standardization of solid waste pretreatment: Establishing testing standards for the composition of organic silicon slag and supporting impurity removal and cleaning lines;

[0059] Process parameter database: Establish formula-performance correspondence tables for different casting types (cast steel, cast iron) (e.g., increasing the mullite content in steel castings to 45%);

[0060] Intelligent detection: integrated online gas emission sensor and air permeability tester to monitor the performance after drying in real time.

[0061] This technology achieves the green casting goal of "replacing materials with waste, reducing costs and increasing efficiency" through the deep coupling of high-value utilization of industrial solid waste and casting technology. The core principle lies in the matching of material properties, coordination of multi-phase interfaces, and precise control of process parameters, providing a replicable technical paradigm for the development of solid waste-based casting materials.

[0062] Example 2: Reference Figure 1 As shown: A method for making an ordinary thermal insulation riser sleeve instead of a floating bead riser sleeve using a compound powder of organic silicon slag, comprising the following steps:

[0063] Step 1: Preparation of silicon-based composite powder: Pre-treated organosilicon slag is mixed with mullite and an additive containing lithium oxide to form a silicon-based composite powder, which is made from the following raw materials in parts by weight: 30% elemental silicon, 6% free carbon, 3% sodium chloride, 35% mullite, and 5% additive;

[0064] The silicon content is 50%, free carbon is 10%, sodium chloride is 5%, and the moisture content is 15%. The silicon-based compound powder is neutral to alkaline with a pH of 7.5. The high calorific value of the silicon-based compound powder on a dry basis is 2500 cal / g. The particle size is 100 mesh. The additive is a mixed material made of lepidolite and spodumene materials with a lithium oxide content of 1%, and is calcined at 1350 degrees.

[0065] Silicone slag is the solid waste generated by the hydrolysis of the original slag slurry produced by silicone enterprises. It is rich in elemental silicon, free carbon, and sodium chloride. After treatment, it becomes a non-toxic raw material, achieving the recycling of industrial solid waste. It is then mixed with mullite (high-temperature resistant and high-strength) and a lithium oxide additive to form a silicon-based compound powder. The lithium oxide in the additive can adjust the material's melting point and improve thermal insulation performance; the mullite enhances refractoriness and structural strength. The compound powder is neutral to alkaline, with a high calorific value of 2500 cal / g on a dry basis and a particle size of 100 mesh. It combines thermal insulation, heat generation, and adhesive compatibility, replacing the core thermal insulation function of floating beads.

[0066] Elemental silicon and free carbon: provide a basic skeleton and low thermal conductivity, enhancing the thermal insulation effect; sodium chloride: adjusts the sintering characteristics of the mixture and improves formability; mullite: improves refractoriness and prevents the riser sleeve from melting during high-temperature pouring; lithium oxide additive: reduces the melting temperature of the material, promotes low-temperature sintering, and reduces energy consumption;

[0067] Step 2: Mixing: 10% white bleached beads and 40% mullite sand (quartz sand) are weighed and dry-mixed for 10 minutes. Then, 15% water glass with a modulus of 2.9 is added and mixed quickly. Finally, 45% of the organosilicon powder is added and stirred thoroughly.

[0068] The water glass is sodium silicate stock solution water glass, and the quartz powder / mullite particle size is 50 mesh;

[0069] Step 3, demoulding and drying: The mixed materials in step 2 are loaded into the riser sleeve mold and compacted. The riser sleeve is obtained after demoulding by vibration or manual / mechanical compaction using a split half mold. The riser sleeve is dried in a dryer or placed for 120 hours, and then the dry strength, gas emission and air permeability are tested to determine whether the riser sleeve production is qualified.

[0070] The wet strength of the riser sleeve before drying is 0.4, the drying temperature of the dryer is 100°, and the drying time is 3 hours. After drying, the dry strength of the riser sleeve is 2.0Map, the gas emission is 60ml / g, and the air permeability is 260.

[0071] Water glass is added to utilize its alkaline bonding properties to bond the granules into shape. It also works in synergy with the alkaline components in the compound powder to improve wet strength. Vibration, manual or mechanical compaction and half-cut molding are used to ensure the density of the riser sleeve structure. Drying can remove moisture and solidify the water glass binder to form a stable structure, while preventing high temperature from causing decomposition of organic components and increasing gas generation.

[0072] The elemental silicon, free carbon and white bleached beads in the compound powder form a porous structure with low thermal conductivity, which slows down the cooling rate of the molten steel in the riser, prolongs the feeding time, and makes the riser shrink into a U shape, achieving effective feeding. Strict control of raw material purity and drying process can avoid porosity defects in castings and ensure timely discharge of gas in the mold during pouring.

[0073] This embodiment is suitable for large-size insulation riser sleeves with a diameter of more than 250. The insulation time of the casting is long after casting, the riser shrinks into a U shape, the shrinkage compensation effect is good, and there is no sand adhesion defect before the riser is cut, which is easy to clean.

[0074] Example 3: Reference Figure 1 As shown: A method for making an ordinary thermal insulation riser sleeve instead of a floating bead riser sleeve using a compound powder of organic silicon slag, comprising the following steps:

[0075] Step 1: Preparation of silicon-based composite powder: Pre-treated organosilicon slag is mixed with mullite and an additive containing lithium oxide to form a silicon-based composite powder, which is made from the following raw materials in parts by weight: 30% elemental silicon, 6% free carbon, 3% sodium chloride, 35% mullite, and 5% additive;

[0076] The silicon content is 50%, free carbon is 10%, sodium chloride is 5%, and the moisture content is 15%. The silicon-based compound powder is neutral to alkaline with a pH of 7.5. The high calorific value of the silicon-based compound powder on a dry basis is 2500 cal / g. The particle size is 100 mesh. The additive is a mixed material made of lepidolite and spodumene materials with a lithium oxide content of 1%, and is calcined at 1350 degrees.

[0077] Silicone slag is the solid waste generated by the hydrolysis of the original slag slurry produced by silicone enterprises. It is rich in elemental silicon, free carbon, and sodium chloride. After treatment, it becomes a non-toxic raw material, achieving the recycling of industrial solid waste. It is then mixed with mullite (high-temperature resistant and high-strength) and a lithium oxide additive to form a silicon-based compound powder. The lithium oxide in the additive can adjust the material's melting point and improve thermal insulation performance; the mullite enhances refractoriness and structural strength. The compound powder is neutral to alkaline, with a high calorific value of 2500 cal / g on a dry basis and a particle size of 100 mesh. It combines thermal insulation, heat generation, and adhesive compatibility, replacing the core thermal insulation function of floating beads.

[0078] Elemental silicon and free carbon: provide a basic skeleton and low thermal conductivity, enhancing the thermal insulation effect; sodium chloride: adjusts the sintering characteristics of the mixture and improves formability; mullite: improves refractoriness and prevents the riser sleeve from melting during high-temperature pouring; lithium oxide additive: reduces the melting temperature of the material, promotes low-temperature sintering, and reduces energy consumption;

[0079] Step 2: Mixing: 10% white bleached beads, 45% mullite sand (quartz sand), and 40% organosilicon powder are weighed and dry-mixed for 10 minutes. Then, 15% water glass with a modulus of 2.9 is added and the mixture is continued to mix until evenly mixed.

[0080] The water glass is sodium silicate stock solution water glass, and the quartz powder / mullite particle size is 50 mesh;

[0081] Step 3, demoulding and drying: Use a core shooter to inject the mixed material in step 2 into the mold cavity for molding. Vibrate or manually / mechanically compact it, demould it and dry it to obtain the riser sleeve. Test the dry strength, gas emission and air permeability to determine whether the riser sleeve is qualified.

[0082] The wet strength of the riser sleeve before drying is 0.4, the drying temperature of the dryer is 100°, and the drying time is 3 hours. After drying, the dry strength of the riser sleeve is 2.0Map, the gas emission is 60ml / g, and the air permeability is 260.

[0083] Water glass is added to utilize its alkaline bonding properties to bond the granules into shape. It also works in synergy with the alkaline components in the compound powder to improve wet strength. Vibration, manual or mechanical compaction and half-cut molding are used to ensure the density of the riser sleeve structure. Drying can remove moisture and solidify the water glass binder to form a stable structure, while preventing high temperature from causing decomposition of organic components and increasing gas generation.

[0084] The elemental silicon, free carbon and white bleached beads in the compound powder form a porous structure with low thermal conductivity, which slows down the cooling rate of the molten steel in the riser, prolongs the feeding time, and makes the riser shrink into a U shape, achieving effective feeding. Strict control of raw material purity and drying process can avoid porosity defects in castings and ensure timely discharge of gas in the mold during pouring.

[0085] This embodiment is suitable for producing riser sleeves with small sizes, such as those with a diameter of less than 100, with high production efficiency and multiple types from one mold.

[0086] The working principle of the present invention is as follows: first, the silicon slag solid waste after the hydrolysis of the original slag slurry of the organosilicon enterprise is subjected to pretreatment processes such as washing, screening and impurity removal of the hydrolyzed slag slurry to remove residual acid (such as hydrochloric acid) and heavy metals, thereby achieving harmless treatment of the solid waste. After treatment, it becomes non-toxic solid waste. Usable organosilicon slag is obtained by treating the solid waste, and the organosilicon slag, mullite and an additive containing lithium oxide are mixed in proportion to be processed into a silicon-based composite powder. By adding white bleached beads, quartz powder or mullite to the silicon-based composite powder, preliminary mixing of the materials can be achieved, and uniform mixing of multiple materials can be achieved through dry mixing. Then, water glass is added to complete the preparation of the wet material. The wet material is placed in a mold for compaction treatment by a core shooting machine or manually, and a riser sleeve is obtained after demoulding and drying. The quality parameters of the current riser sleeve production can be obtained by testing the dry strength, gas emission and air permeability of the riser sleeve. When the quality parameters are unqualified, the reasons for the abnormality can be analyzed according to the differences in various parameters:

[0087] Insufficient dry strength: Check the drying process (whether the temperature / time meets the standards) and the material ratio (whether the adhesive has failed).

[0088] The amount of gas generation is too high: confirm the purity of the raw materials (whether they contain highly volatile impurities) and whether the drying is thorough (residual moisture will increase high-temperature gas generation).

[0089] Abnormal air permeability: Check the sample compactness (too loose / too tight affects porosity) and material particle size distribution (excessive fine powder blocks the pores);

[0090] Through cause analysis, the production process can be optimized, thereby improving the processing quality of subsequent riser sleeves.

[0091] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for making common thermal insulation riser sleeves instead of floating bead riser sleeves using organic silicon slag compound powder, characterized by: The following steps are involved: S1. Preparation of silicon-based composite powder: Pre-treated organosilicon slag is mixed with mullite and an additive containing lithium oxide to form a silicon-based composite powder, which is made from the following raw materials in parts by weight: 20% to 36% elemental silicon, 1% to 12% free carbon, 0.5% to 6% sodium chloride, 35% to 40% mullite, and 5% to 6% additive; S2. Mixing treatment: add white bleached beads, quartz powder or mullite to the silicon-based compound powder, dry mix for 5 to 10 minutes, then add 15% to 17% of water glass with a modulus of 2.8-3.0, mix and stir evenly; S3, demoulding and drying: the mixed materials in S2 are loaded into a mold and compacted, demoulded, and a riser sleeve is obtained. The riser sleeve is dried in a dryer or placed for 120 hours, and then the dry strength, gas emission and air permeability are tested to determine whether the riser sleeve production is qualified.

2. The method for making common thermal insulation riser sleeves instead of floating bead riser sleeves using the organic silicon slag compound powder according to claim 1, characterized in that: In the organosilicon slag of S1, the content of elemental silicon is 40% to 60%, the free carbon is 2% to 20%, the sodium chloride is 1% to 10%, and the moisture content is 15% to 30%.

3. The method for making common thermal insulation riser sleeves instead of floating bead riser sleeves using the organosilicon slag compound powder according to claim 1, characterized in that: In S1, the silicon-based compound powder is neutral to alkaline, with a pH of 7-8.

5.

4. The method for making common thermal insulation riser sleeves instead of floating bead riser sleeves using the organosilicon slag compound powder according to claim 1, characterized in that: In S1, the dry basis high calorific value of the silicon-based composite powder is 2500-3000 cal / g, the particle size is 30-200 mesh, and the auxiliary agent is a mixed material made of lepidolite and spodumene materials with a lithium oxide content of 1% to 2%, and is calcined at 1350 degrees.

5. The method for making common thermal insulation riser sleeves instead of floating bead riser sleeves using the organosilicon slag compound powder according to claim 1, characterized in that: In S2, the proportion of silicon-based compound powder is 30% to 45%, the proportion of white bleached beads is 10% to 15%, and the proportion of quartz powder or mullite is 40% to 50%.

6. The method for making common thermal insulation riser sleeves instead of floating bead riser sleeves using the organosilicon slag compound powder according to claim 1, characterized in that: In S2, the water glass is sodium silicate stock solution water glass with a modulus of 2.8-3.0, and the quartz powder / mullite particle size is 30-70 mesh.

7. The method for making common thermal insulation riser sleeves instead of floating bead riser sleeves using the organosilicon slag compound powder according to claim 1, characterized in that: In S3, the green strength of the riser sleeve before drying is 0.3-0.

5.

8. The method for making common thermal insulation riser sleeves instead of floating bead riser sleeves using the organosilicon slag compound powder according to claim 1, characterized in that: In S3, the drying temperature of the dryer is 100°-120°, and the drying time is 2h-3h.

9. The method for making common thermal insulation riser sleeves instead of floating bead riser sleeves using the organosilicon slag compound powder according to claim 1, characterized in that: In S3, the dry strength of the riser sleeve is 1.5-2.2Map, the gas generation volume is 50-70ml / g, and the permeability is 150-320.

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