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CN-122010427-A - Ultralow-aluminum-rate corrosion-resistant cement clinker as well as preparation method and application thereof

CN122010427ACN 122010427 ACN122010427 ACN 122010427ACN-122010427-A

Abstract

The invention discloses an ultralow-aluminum-rate corrosion-resistant cement clinker, and a preparation method and application thereof, and belongs to the technical field of silicate cement. The clinker comprises 55-65% of C3S, 15-25% of C2S, less than or equal to 2% of C3A, 17-21% of C4AF, 0.50-1.00% of aluminum rate IM, 0.910-0.930% of lime saturation coefficient KH and 1.90-2.10% of silicon rate SM. The preparation method comprises the steps of S1 raw material preparation and S2 sintering. According to the invention, by constructing a new mineral system of 'high iron phase-optimized silicate phase' and matching with a specific sintering process, not only is the combustibility and energy consumption of clinker improved while the aluminum rate is obviously reduced, but also the obtained clinker has excellent sulfate erosion resistance, the compressive strength of the clinker in 3 days and 28 days is equivalent to that of common silicate clinker, the strength improvement rate after 60 days is obviously improved compared with that of common clinker, the hydration heat is obviously reduced, the comprehensive performance is excellent, and the method is suitable for engineering construction in a severe sulfate environment.

Inventors

  • WANG ZHEWU
  • WU GUILIN
  • YANG JIE
  • YUAN MINGWEI
  • ZHU DERONG
  • LIU YI
  • LV ZHAOYUN
  • SHI FANG
  • Pu Qianlong

Assignees

  • 安徽池州海螺水泥股份有限公司
  • 安徽海螺水泥股份有限公司
  • 安徽海螺集团有限责任公司

Dates

Publication Date
20260512
Application Date
20260116

Claims (10)

  1. 1. The ultra-low aluminum corrosion-resistant cement clinker is characterized by comprising, by mass, 55-65% of C3S, 15-25% of C2S, less than or equal to 2% of C3A and 17-21% of C4AF, wherein the aluminum content IM of the clinker is 0.50-1.00, the lime saturation coefficient KH is 0.910-0.930, and the silicon content SM is 1.90-2.10.
  2. 2. Cement clinker according to claim 1, characterized in that the aluminium content IM of the clinker is 0.65-0.85.
  3. 3. Cement clinker according to claim 2, characterized in that the aluminium content IM of the clinker is 0.65-0.77.
  4. 4. A cement clinker according to any of claims 1-3, characterized in that the clinker has a C3A content of less than or equal to 1.5%.
  5. 5. A cement clinker according to any of claims 1-3, characterized in that the C4AF content of the clinker is 18-20%.
  6. 6. A method for preparing the ultra-low aluminum corrosion resistant cement clinker according to any one of claims 1 to 5, comprising the steps of: S1, preparing raw materials, namely weighing limestone, sandstone, copper mineral powder and fly ash according to a proportion, mixing and grinding to a specified fineness to obtain raw materials; S2, sintering, namely sintering the raw material prepared in the step S1, wherein the highest sintering temperature is 1230-1270 ℃, and cooling to obtain the cement clinker.
  7. 7. The method according to claim 6, wherein in step S1, the raw material ratio is controlled such that the raw material ratio satisfies the lime saturation coefficient kh=0.92-1.02, the silicon ratio sm=2.00-2.10, and the aluminum ratio im=0.65-0.80.
  8. 8. The method according to claim 6, wherein in the step S1, the raw materials comprise, by mass, 82.5-85.0% of limestone, 8.5-11.0% of sandstone, 2.0-7.5% of copper ore powder and 0-3.0% of fly ash.
  9. 9. A cement, characterized in that it comprises a cement clinker according to any of claims 1-5.
  10. 10. Use of a cement clinker according to any of claims 1-5 for the preparation of sulfate-resistant cement.

Description

Ultralow-aluminum-rate corrosion-resistant cement clinker as well as preparation method and application thereof Technical Field The invention relates to the technical field of silicate cement materials, in particular to cement clinker with ultralow aluminum rate and high sulfate erosion resistance, and a preparation method and application thereof. Background Portland cement is the most important building engineering material today. However, under severe conditions rich in sulfate such as marine environments, saline-alkali soil, underground engineering and the like, conventional cement concrete is susceptible to sulfate attack and destruction. The sulfate reacts with calcium aluminate and the like in cement hydration products to generate expansive crystals, so that the concrete structure is cracked, peeled off and lost in strength, and the durability and the safety of the engineering structure are seriously threatened. The classical method for improving the sulfate resistance of cement is to produce sulfate-resistant silicate cement, and the core technology is to strictly control the content of tricalcium aluminate (C3A) minerals which have high hydration activity and are easy to attack by sulfate in clinker. For example, the national standard GB/T748-2005 states that the C3A content in medium-and high-sulfate-resistant cement clinker must not exceed 5.0% and the C3A content in the medium-and high-sulfate-resistant cement clinker must not exceed 3.0%. To achieve this goal, conventional production methods typically employ a medium to high alumina (IM, typically greater than 0.9) dosing scheme to ensure adequate aluminum and iron phases to form a proper amount of flux minerals while limiting the total C3A content, maintaining normal clinker firing and some early strength. However, the traditional technical route has obvious limitations that firstly, the improvement of sulfate resistance mainly depends on the 'passive limitation' of C3A, the performance is in a ceiling, and the extremely-long service life requirement under extremely severe environment is difficult to meet, secondly, the medium-high aluminum rate batching scheme has high dependence on high-quality aluminum raw materials (such as alumina) and higher cost, and does not meet the green development trend of using low-grade raw materials and saving mineral resources, thirdly, the traditional technical route is the most critical point, if the aluminum rate is simply tried to be further reduced to pursue better corrosion resistance or economy, the clinker firing difficulty (the content of free calcium oxide f-CaO is increased) and insufficient silicate mineral formation are caused due to insufficient liquid phase quantity, and further serious performance imbalance problems such as excessively slow early strength development, abnormal setting time and the like are caused. Therefore, the development of cement clinker and the production technology thereof, which can realize high sulfate erosion resistance and excellent comprehensive mechanical properties at the same time under the condition of ultralow aluminum rate, is a technical problem to be broken through in the field. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides an ultra-low aluminum rate corrosion-resistant cement clinker, a preparation method and application thereof, and the technical scheme of the invention is as follows: The invention provides an ultralow-aluminum-rate corrosion-resistant cement clinker, which comprises, by mass, 55-65% of C3S, 15-25% of C2S, less than or equal to 2% of C3A and 17-21% of C4AF, wherein the aluminum rate IM of the clinker is 0.50-1.00, the lime saturation coefficient KH is 0.910-0.930, and the silicon rate SM is 1.90-2.10. Preferably, the clinker has an aluminum ratio IM of 0.65-0.85. Preferably, the clinker has an aluminum ratio IM of 0.65-0.77. Preferably, the clinker has a C3A content of 1.5% or less. Preferably, the clinker has a C4AF content of 18-20%. The invention also provides a method for preparing the ultra-low aluminum rate corrosion-resistant cement clinker, which comprises the following steps: S1, preparing raw materials, namely weighing limestone, sandstone, copper mineral powder and fly ash according to a proportion, mixing and grinding to a specified fineness to obtain raw materials; S2, sintering, namely sintering the raw material prepared in the step S1, wherein the highest sintering temperature is 1230-1270 ℃, and cooling to obtain the cement clinker. Preferably, in the step S1, the raw material ratio is controlled to ensure that the raw material rate meets the conditions that the lime saturation coefficient KH=0.92-1.02, the silicon rate SM=2.00-2.10 and the aluminum rate IM=0.65-0.80. Preferably, in the step S1, the raw materials comprise 82.5-85.0% of limestone, 8.5-11.0% of sandstone, 2.0-7.5% of copper mine powder and 0-3.0% of fly ash in percentage by mass. The invention also provides a ce