68results about How to "Improve gelling activity" patented technology

The invention provides a novel red mud-based grouting material and preparation method thereof. The grouting material is prepared from the following components by weight percent: 70-80% of red mud liquid, 15-25% of blast furnace slag powder, 5-10% of compound alkali-activator, 2-10% of water reducing agent and 1-2% of early strength agent. The novel red mud-based grouting material prepared from redmud and the blast furnace slag powder is good in fluidity, high in early strength and short in time of coagulation, and does not shrink. The preparation method provided by the invention reasonably utilizes industrial waste, can reduce the influence of the waste on the environment, and is easy in preparation; the method is simple in steps, convenient to operate and high in practicability.

The invention belongs to the novel cement material field and specifically relates to the preparation of a single-component alkali-activated cement and an application method thereof, wherein a raw material 1 including SiO2, Al2O3, and CaO are mixed with the raw material 2 including Na2O in a certain ratio; the ratio should be decided so that the percentage of the weight of each component of the calcined product, which is obtained by calcining the mixed materials at a temperature greater than or equal to 1100 DEG C, in the total weight is as follows: Al2O3: 8-25%; SiO2: 24-55%; CaO: 10-55%; and Na2O +0.658K2O: 6-25%; after being calcined at a temperature ranging from 950-1200 DEG C for 1.5-3 h, the mixed materials are then ground to obtain cement powder; the cement powder is mixed with water into paste; next, the paste is cured at 50-80 DEG C for 2-3 days so that neat cement paste briquettes excellent in strength can be obtained; and the strength can be continuously increased if curing is continuously performed under normal temperature. The preparation of the single-component alkali-activated cement has the following advantages that: the raw material range of the alkali-activated cement is greatly expanded; the storage, transportation and utilization of the cement are more convenient; and the improvement of the cementitious activity of the cement and the reduction of the cost are expected to be realized.

The invention discloses a method for biomass reduction of iron oxide in red mud and synchronous improvement of inorganic component activity, and belongs to the technical field of iron ore concentrate production by high-iron Bayer process red mud. The usage of biomass accounts for 5%-50% that of the high-iron Bayer process red mud, raw materials are weighed and uniformly mixed, and obtained mixture is sintered at the temperature ranging from 400 DEG C to 750 DEG C. Iron ore concentrate meeting blast furnace iron making requirements and inorganic materials with high cementitious activity are obtained after magnetic separation. Biomass raw materials replace pulverized coal to reduce hematite in the high-iron Bayer process red mud, reduction temperature can be reduced by about 200 DEG C, and optimal inorganic component cementitious activity can be synchronously obtained. The steps of hematite reduction and inorganic cementitious activity improvement are combined, the high-iron red mud serving as solid waste discharged in the aluminum oxide production process is used by 'stepped all components', energy consumption is reduced as compared with carbon-based reduction, carbon emission is decreased, investment and production cost is reduced, and environmental benefits, social benefits and economic benefits are remarkable.