10results about How to "Increase alkalinity" patented technology

The present application belongs to the technical field of white carbon black preparation, and particularly relates to an industrialized preparation method for preparing high-purity low-fluorine white carbon black by taking fluorine-containing silicon slag as raw material, and through mechanical activation, composite alkali leaching, fractional impurity removal, low-temperature crystallization and surface modification. The present application can realize harmless disposal of the fluorine-containing silicon slag and high-value regeneration and utilization of fluorine and silicon resources, has good environmental protection value and economic benefits, and has wide industrialized application prospect.

This invention provides a road base material based on sludge and construction waste, its preparation method, and its application. The road base material includes a base component and an admixture component. The base component includes: 45-55% recycled coarse aggregate, 20-35% recycled fine aggregate, 15-25% sludge, 4-6% cement, and 1-4% water. Both the recycled coarse and fine aggregates are derived from construction waste. The admixture component includes quicklime, sodium hydroxide, and zinc ricinoleate. The mass percentage of quicklime to sludge is 4-8%, the mass percentage of sodium hydroxide to sludge is 0.1-0.2%, and the mass percentage of zinc ricinoleate to sludge is 0.2-0.5%. This invention promotes the high-value utilization of urban solid waste such as sludge and construction waste, and yields a higher-performance road base material based on sludge and construction waste.

This invention relates to the field of comprehensive utilization technology of iron and steel smelting resources, specifically to a method for the direct recycling and utilization of iron-rich red mud in converter steelmaking. The method includes the following steps: Step 1: Retaining slag, including MgO, in the converter for slag splashing and furnace protection; Step 2: Adding fine-grained limestone to the converter; Step 3: Adding iron-rich red mud to the converter, and shaking the converter 2-3 times after the mud has been added; Step 4: Verticalizing the converter and blowing nitrogen into it at least once using a top-blowing method, with each blowing lasting 3-5 seconds and an interval of 10 seconds between each blowing; Step 5: Adding scrap steel to the converter, waiting 0-5 minutes, then adding molten iron and starting the blowing process. This invention directly applies iron-rich red mud to the converter steelmaking process, achieving dephosphorization of molten iron with high phosphorus content without the use of flux.

The present application belongs to the field of comprehensive utilization of solid waste resources, and relates to a calcium silicate board synthesized from industrial solid waste and a preparation method thereof. The calcium silicate board comprises oil-removed waste diatomite, fly ash, slaked lime, fiber and activator. In the present application, wood fiber is modified by hydrothermal treatment with citric acid modification, so as to reduce the water absorption of the wood fiber. The modified wood fiber is compounded with rock wool fiber to exert the tensile strength of the modified wood fiber and the heat resistance and chemical stability of the rock wool fiber. In the present application, a pre-hydration process is designed. After the oil-removed waste diatomite is mixed with the fly ash and reacts with excess calcium hydroxide, the product can provide nucleation sites as crystal nuclei, significantly accelerating the hydration kinetics process of the system. In combination with a continuous two-stage temperature-controlled steam pressure curing process, the crystal phase content of tobermorite in the calcium silicate board is increased, and the macroscopic performance of the material is comprehensively improved. Moreover, the present application can absorb a large amount of oil-containing waste diatomite and fly ash, realizing the resource utilization of industrial solid waste.

This invention discloses a lithium slag composite admixture, low-carbon lithium slag concrete, and their preparation method, belonging to the field of concrete technology. The method includes the following steps: preparing calcium-type lithium slag synthetic zeolite using lithium slag; preparing lithium slag-based negatively charged mesoporous silica using the waste liquid generated during the preparation of the calcium-type lithium slag synthetic zeolite; and finally mixing the calcium-type lithium slag synthetic zeolite, the lithium slag-based negatively charged mesoporous silica, and the undisturbed lithium slag to obtain the composite admixture. This invention solves the problem of excessively high SO3 content in lithium slag concrete under high admixture dosage, and also addresses the technical defects of insufficient lithium slag activity and low concrete strength, effectively reducing the cracking risk of lithium slag concrete, comprehensively improving the density and workability of lithium slag concrete, and realizing the high-value-added resource utilization of lithium slag solid waste.

The invention discloses a method for promoting growth of intercropping crops based on a soil micro food web and application of the method, and belongs to the technical field of crop planting. According to the invention, it is found for the first time that by adding a specific type of bacterial-feeding nematodes into soil, synergistic improvement of growth indexes such as plant height, stem diameter and biomass of two crops can be obviously and stably promoted; the application method is simple and easy to operate, the cost is controllable, and no additional farming equipment or steps are needed; the method is high in environmental compatibility, is particularly suitable for a farmland peanut-corn intercropping system in alkaline and calcareous soil, can effectively improve the crop growth performance, farmland productivity and agricultural product yield and quality, can optimize the soil ecological function, continuously increases the economic benefits of farmers, and has wide application prospects. A brand-new, low-cost and easy-to-popularize candidate scheme is provided for agricultural green sustainable development of the alkaline soil area in North China, and the application prospect is wide.

The present application belongs to converter steelmaking technical field, provide a kind of LF refining quick slag melting method, the present application is injected with pre-melting agent along with molten steel in the process of converter tapping, the composition of pre-melting agent is according to mass percentage respectively: calcium oxide 60-70%, lithium oxide 4-7%, silicon dioxide 3-6%, calcium fluoride 5-10%, magnesium oxide 4-8%, di-aluminum oxide 10-15%, by adding the above pre-melting agent in the process of tapping, while improving the basicity of slag, effectively reduce the melting point of slag, promote the rapid melting of slag, shorten the LF refining station furnace slag melting time, and inhibit the occurrence of phosphorus, reduce the LF refining smelting time, provide good guarantee for rolling quality.The application of the present application can provide a reliable smelting method for improving production efficiency for operators, which can effectively reduce production cost, while ensuring the purity of molten steel.

The invention belongs to the technical field of cementing materials, and particularly relates to an organic-inorganic composite alkali-activated cementing material and a preparation method thereof. The modified wollastonite added into the organic-inorganic composite alkali-activated cementing material has a large amount of silicon hydroxyl (Si-OH), and the groups are high in activity, so that the compatibility and binding force of the wollastonite and the styrene butadiene rubber emulsion can be greatly improved. The modified wollastonite provides CaO and SiO2 at the same time, a hybridization system composed of N-A-S-H gel, C-A-S-H gel and unreacted wollastonite needle-shaped particles is formed, the hybridization system can force cracks to deflect, bypass and branch in the expansion process, more fracture energy is consumed, and therefore the fracture toughness and toughness of the material are improved.

The invention provides crystallizer casting powder for continuous casting of a high-hydrogen-content medium carbon steel slab, a preparation method and application, and the crystallizer casting powder for continuous casting of the high-hydrogen-content medium carbon steel slab comprises the following components in percentage by mass: 15-22% of CaO, 30-38% of SiO2, 9-14% of Na2O + K2O, 6-9% of F, 0.5-1.5% of Li2O, 1-3% of B2O3, 4-6% of C and the balance of inevitable impurities. Moreover, the preparation method is simple, convenient to operate and suitable for industrial large-scale production, and the production cost is reduced.

The application discloses a method for preparing a steel slag-based cementitious material by using an indirect carbonation technology, and comprises the following steps: providing a steel slag in a powder form; mixing the steel slag with a carbonation carrier, an aluminum-containing activator, water and an optional water reducing agent to obtain a slurry material; placing the slurry material into a forming mold for forming; and obtaining a rough blank after demolding; and performing a curing treatment on the rough blank to obtain the steel slag-based cementitious material. The main component of the carbonation carrier is calcium carbonate, and the aluminum-containing activator is used to activate the calcium carbonate to release carbonate ions, so as to indirectly carbonize free calcium oxide, magnesium oxide and silicates in the steel slag, thereby preparing the steel slag-based cementitious material with good cementitious properties and high strength. The application provides a new way for the production of carbonated steel slag products, and has the characteristics of environmental protection, waste utilization, energy saving and low cost.