96 results about "Tobermorite" patented technology

The invention discloses a high-temperature-resistant well cementation cement paste system, and relates to the technical field of cement paste systems. The system comprises the following components: 60-75% of Portland cement; 15-25% of a strength recession resisting agent; 2-8% of a crystal form stabilizer; 0.5%-6% of a high-temperature retarder; and 3-8% of a high-temperature fluid loss agent, wherein the Portland cement is one of D-grade oil well cement or low-heat cement, and the specific surface area of the Portland cement is 280-350 m<2> / kg; the SiO2 content in the strength recession resisting agent is greater than 90%, and the mesh number is greater than or equal to 150 meshes; the content of SiO2 in the crystal form stabilizer is greater than 30%, and the mesh number is greater thanor equal to 600 meshes. The crystal form stabilizer is added and participates in hydration reaction when cement is hydrated, metal ions enter the structure of hydrated calcium silicate, so that conversion of tobermorite in a hydration product into xonotlite is prevented, the set cement is kept in a compact structure, and therefore, good high-temperature stability is achieved.

The invention discloses a nickel pollution soil repair agent. The repair agent comprises the following raw materials, by mass, of 22-30 parts of tobermorite, 5-8 parts of giant uronemaconfervicolum, 5-8 parts of hypnea chordacea and 4-7 parts of modified rhodonite, wherein the dosage ratio of the giant uronemaconfervicolum to the hypnea chordacea is 1:1. The preparation of the modified rhodonite comprises super micro-grinding, mixing with N-maleyl chitosan, dispersing, ultrasonic treatment and drying. The giant uronemaconfervicolum and the hypnea chordacea are smashed and screened, and powder is obtained. The tobermorite is calcinated; a dextrotartaric acid aqueous solution is added to conduct soaking treatment; the treated tobermorite is taken out, refrigerated and mixed with the giant uronemaconfervicolum, the hypnea chordacea and the modified rhodonite; and ultrasonic treatment and drying are conducted, and the nickel pollution soil repair agent is obtained. According to the nickel pollution soil repair agent, the compound mode containing four components, namely, the tobermorite, the giant uronemaconfervicolum, the hypnea chordacea and the modified rhodonite is adopted, the content of leached nickel in the soil can be significantly reduced, and meanwhile, secondary pollution to the repaired soil is not caused.

The invention discloses a method for preparing 1.1 nm tobermorite from low-grade attapulgite clay. The method comprises steps as follows: low-grade attapulgite clay minerals are smashed, 150-300-mesh powder is obtained and dispersed in an aqueous silicate solution, a mixed solution is subjected to microwave activation for 5-10 min, and a stable suspension liquid A is formed; calcium salt is dispersed in water, and a uniform dispersion liquid B is formed; the dispersion liquid B is slowly added to the suspension liquid A during fast stirring and is sufficiently and uniformly mixed, and a precursor suspension liquid is obtained; the precursor suspension liquid is transferred into a hydrothermal reaction kettle to be subjected to a hydrothermal reaction, and then is cooled to the room temperature; solid products are separated, washed, dried and smashed, and the 1.1 nm tobermorite is obtained. According to the method, components of the attapulgite clay are subjected to the chemical reaction with silicon salt and calcium salt in a hydrothermal process, so that a crystal form is converted and recombined, the 1.1 nm tobermorite with good stability and uniform granularity is formed, and a product is good in uniformity, stable in performance and applied to adsorbents for substances such as heavy metals, dyes, antibiotics and the like.