7 results about "Tricalcium silicate" patented technology

The application discloses a low-carbon high-performance cement clinker and a preparation method thereof, and relates to the technical field of building materials, in particular to a low-carbon cement clinker and a preparation method thereof. The raw materials in the cement clinker include the following components in percentage by weight: 75-90% of raw material, 5-20% of steel slag and 2-8% of a conditioning material, wherein the conditioning material includes at least two of lead-zinc slag, copper slag, manganese slag and lithium slag. The lead-zinc slag in the conditioning material contains 0-5.5% of ZnO in percentage by weight; the copper slag contains 0-2.0% of CuO in percentage by weight; the manganese slag contains 0-7.0% of MnO2 in percentage by weight; and the lithium slag contains 0-3.0% of Li2O in percentage by weight. The application adds the conditioning material, ensures the content of zinc, copper, manganese or lithium in the cement clinker, realizes the purposes of stabilizing R-type tricalcium silicate and improving the strength of the cement clinker, does not add components such as fluorine and sulfur which pollute the environment, is environmentally-friendly, safe and reliable, and has a wide source of raw materials and strong applicability.

This invention is related to a cement clinker formed by firing raw meal prepared with new and improved raw meal minerals. This new cement clinker is a hydraulically activated cement clinker which can contain alite (tricalcium silicate) and aH' dicalcium silicate phase together with boron and fluorine doping and can be fired at lower temperatures and has lower carbon dioxide emission.

This invention discloses a method and system for online reconstruction of mineral phases in high-temperature steel slag, belonging to the field of steel slag resource utilization technology. The method involves crushing coal gangue and room-temperature steel slag to a particle size of 0.5 to 3 mm, mixing them at a mass ratio of 1:0.5 to 1.5 to prepare a reconstruction adjuster, and then adding the reconstruction adjuster and high-temperature liquid steel slag (temperature above 1350℃) to a mixing furnace at a mass ratio of 0.1 to 0.5:1. After settling, the mineral phase reconstruction is completed, converting free calcium oxide into dicalcium silicate and tricalcium silicate, magnesium oxide, ferrous oxide, and manganese oxide into the RO phase, and ferric oxide into ferrous oxide and elemental iron. The mixture after the reaction is cooled to below 500℃, then crushed, magnetically separated, and ground to a specific surface area of ​​400 square meters per kilogram to obtain a cementitious material. This invention utilizes the sensible heat of the high-temperature steel slag itself, eliminating the need for additional heating, achieving high-value utilization of solid waste. The prepared cementitious material exhibits high hydration activity and good volume stability. The process is simple and easy to implement, contributing to the metallurgical industry's achievement of dual-carbon goals.

The application provides an oil well cement early strength agent and cement slurry, which comprises the following components in parts by weight: 1.0-8.0 parts of nanocrystalline seeds, 1-8.0 parts of formamide, 1.0-8.0 parts of alcohol amine organic compounds, 5.0-20.0 parts of sulfate, 1.0-8.0 parts of dispersants and 5.0-25.0 parts of mixed alkali. The application accelerates the setting and strength development of cement by the reaction of sulfate and calcium ions in cement to form calcium sulfate crystals which are beneficial to the hydration reaction of cement; the nanocrystalline seeds provide the basis for the formation of C-S-H gel through the effect of crystal nucleus, accelerate the hydration reaction of tricalcium silicate and dicalcium silicate in cement, and rapidly react with water molecules to release heat due to the large surface area and high activity, thereby promoting the rapid formation of C-S-H gel, improving the early strength, optimizing the microstructure, reducing the porosity, improving the interface transition zone and promoting the closer interface combination.

The application discloses a cement clinker based on composite tailings and steel slag and a preparation method thereof. The cement clinker comprises the following raw materials in parts by weight: limestone 68.0-75.0 parts, lead-zinc tailings 10.5-20.7 parts, granite tailings 5.1-6.1 parts and steel slag 5.2-12.5 parts. The mass percentage of tetracalcium aluminoferrite in the cement clinker is more than 20 wt%, and the mass percentage of tricalcium silicate is less than 50 wt%. The preparation method comprises the following steps: weighing the raw materials according to the weight ratio, ball milling, drying, sieving, loading into a tablet press mold and pressing into round tablets, ladder heating the round tablets to 1350-1375 DEG C, keeping warm, obtaining the sintered cement clinker, rapidly cooling to below 300 DEG C, and grinding to below 200 mesh using a vibration mill. The application helps to reduce the accumulation of tailings and steel slag resources, effectively improves the comprehensive utilization rate of aluminosilicate industrial solid waste resources and the use range in the building material field.

The application discloses an alite-belite composite new-phase high-strength cement clinker and a preparation method thereof. In terms of mass percentage, a mineral phase composition of the cement clinker comprises C3S: 15-25%, C2S: 30-40%, Q phase: 15-25%, C4A3$: 10-20% and C4AF: 5-10%. The Q phase is a CaO-Al2O3-MgO-SiO2 quaternary compound, and the C2S contains alpha'-C2S. A modifier is further added to a raw material composition of the cement clinker, and the modifier simultaneously comprises a metal oxide and a non-metal substance. The process of the application successfully realizes coexistence of a high-temperature mineral phase (tricalcium silicate) and a low-temperature mineral phase (calcium sulphoaluminate and Q phase) in the cement clinker, simultaneously converts dicalcium silicate from a low-activity form into a high-activity form, and overcomes the problem of insufficient strength development in a middle and later period of a high-belite sulphoaluminate cement.

This invention discloses a method for constructing a fully atomic numerical model of hydrated calcium silicate (C-S-H), which overcomes the anisotropy limitations of traditional crystal models caused by their ordered layered structure. The process includes: constructing a prepolymer model composed of tricalcium silicate / dicalcium silicate / water molecules based on molecular dynamics; optimizing the molecular configuration to correct the Dreiding force field based on density functional theory; and constructing an amorphous C-S-H model with a three-dimensional continuous, randomly cross-linked network structure by controlling the stepwise polymerization of silicon-oxygen tetrahedra through a Perl cross-linking program based on the C-S-H hydration reaction process. This model reproduces the amorphous characteristics and macroscopic isotropy of C-S-H gel. This invention provides a numerical model foundation closer to the real state of matter for exploring the microstructure and performance regulation of cement-based materials at the atomic scale, and provides theoretical support for revealing the cement hydration process and its intrinsic mechanism.