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1095results about "Alkali metal silicates" patented technology

Method for recovering vanadium, potassium and silicon from waste vanadium catalyst

The invention discloses a method for recovering vanadium, potassium and silicon from a waste vanadium catalyst. The method comprises the following steps: firstly, leaching the waste vanadium catalyst in water, and leaching in a reductic acid, wherein the total leaching rate of vanadium is greater than or equal to 95.0%, separating the silicon from vanadium and potassium transferred to a leaching solution in a form of a leaching slag; preparing liquid sodium silicate to recover silicon from the leaching slag by alkali dissolution; separating the vanadium from potassium in the leaching solution in an extraction manner; preparing potassium sulphate to recover potassium from a raffinate phase in an evaporative crystallization manner; and preparing vanadium pentoxide from an extract phase by the procedures of re-extraction, molybdenum precipitation, calcination and the like. Meanwhile, the vanadium in the extract phase and the raffinate phase is larger in distribution ratio, and does not react with other metal impurities such as iron and the like due to excellent selectivity of an extraction agent TOA on vanadium, other metal impurity ions such as iron and the like do not need to be removed in advance, and the vanadium can be directly extracted. Thus, a part of edulcoration procedures are reduced, the raw material consumption is saved, and a high-purity product of vanadium can be directly prepared. By adopting the method disclosed by the invention, not only can the vanadium, potassium and silicon in the waste vanadium catalyst be comprehensively recovered, but also the targets of turning the waste into treasure and protecting the environment are achieved.
Owner:KAIFENG UNIV

Modified water-based inorganic zinc rich coating and preparation method thereof

The invention relates to a modified water-based inorganic zinc rich coating and preparation thereof. The modified water-based inorganic zinc rich coating is produced by mixing a composite powder with a water-based inorganic binder in a weight ratio of (65-75): (35-25), wherein the composite powder comprises 40-70 parts of metal zinc powder, 3-15 parts of composite iron-titanium powder and 0-15 parts of an antirust agent; the water-based inorganic binder is a lithium silicate binder and comprises 10-25 parts of lithium silicate binder, 60-75 parts of silica sol, 10-15 parts of modified binder and 0.6-3 parts of other auxiliaries; and the modified binder is organic fluorine and / or an organic silicon modified acrylic emulsion. The water-based inorganic lithium silicate binder is used as the base stock of the modified water-based inorganic zinc rich coating, so that the coating is quick in air-drying, nontoxic, tasteless and non-combustible, and has excellent abrasive resistance, flexibility, impact resistance, bending resistance, high / low temperature resistance, electric welding resistance and chemical corrosion resistance, as well as high binding strength, resistance to heat and humidity, salt water resistance and long salt fog resistance time; therefore, the coating is suitable for various building steel structure as a heavy corrosion protective primer, and also can be used as a paint for closure of thermally sprayed zinc, thermally sprayed aluminium anticorrosion layers.
Owner:JIUQING PAINT SHANGHAI

Method for preparing lithium ferrous silicate or carbon ferrous silicate cathode material for lithium ion battery

The invention discloses a method for preparing a lithium ferrous silicate or carbon ferrous silicate cathode material for a lithium ion battery, relates to a method for preparing a cathode material for a lithium ion battery and aims to solve the problems that the conventional prepared lithium ferrous silicate or carbon ferrous silicate composite is low in purity, inhomogeneous in granularity, and poor in electrochemical cycling stability. The method comprises the following steps of: 1, weighing a lithium salt compound, a ferric salt compound, a nano silica and a carbon source compound; 2, dispersing the weighed materials in the step 1 into a dispersing agent by a ball mill or ultrasonic dispersion method to obtain mixed liquor; 3, drying the mixed liquor by a spray drying method to obtain precursor powder; and 4, heating, namely heating the precursor powder obtained in the step 3 under the protection of inert gas in a certain flow rate, cooling naturally to room temperature, and thus obtaining the lithium ferrous silicate or carbon ferrous silicate cathode material for the lithium ion battery. The method is mainly applied to preparation of the lithium ferrous silicate or carbon ferrous silicate cathode material for the lithium ion battery.
Owner:HARBIN INST OF TECH

Method for preparing active carbon and rice hull tar by comprehensively utilizing rice hulls and co-producing water glass or silicon phosphate

The invention provides a method for preparing active carbon with strong adsorptivity and rice hull tar by comprehensively utilizing rice hulls and co-producing water glass or silicon phosphate, comprising the following steps of: slowly sifting the rice hulls into an activated carbonization furnace; carbonizing and depositing in the activated carbonization furnace to form a carbon shell and generate a gas; condensing the gas to obtain the rice hull tar; and processing the carbon shell by sodium hydroxide or a phosphoric acid to obtain the active carbon and the water glass or a silicon phosphate curing agent. The method has simple process, and the produced products have good quality, high output, low cost and no pollution, thereby large-scale industrialized production can be realized. The obtained rice hull active carbon contains no heavy metal ion, i.e. lead, cadmium, arsenic, mercury, and the like which are toxic to human bodies and other toxic and harmful substances and is a purifying agent, a decolorizing agent and a catalyst which are urgently needed in the fields of foods, medicines and environmental protection; the rice hull curing water glass is a non-toxic harmless aqueous inorganic adhesive and has wide application range; in addition, the rice hull tar is renewable biological energy. The method has good social benefit and economic value.
Owner:成如山

Process method for producing fluorine compounds and silicon compounds by cleanly utilizing fluosilicic acid

The invention discloses a process method for producing fluorine compounds and silicon compounds by cleanly utilizing fluosilicic acid. The process method comprises the following steps of: preparing fluosilicic acid as a phosphorus chemical by-product into an anhydrous aluminum fluoride product, a sodium fluoride product and a cryolite product, and combining with other industrial waste silicon slags and aluminum slags to prepare a 4A zeolite product. The process method comprehensively utilizes the fluosilicic acid and has high resource recovery rate, wherein the recovery rate of the fluorine element reaches higher than 90 percent. Waste silicon dioxide slags generated in the process can be recycled to produce white carbon black and the 4A zeolite, and a mother liquor, a cleaning solution and waste gas which are generated in the production process are all recycled, thereby the environmental pollution is reduced, and the purposes of zero emission and no pollution are truly achieved, thus the method completely meets the requirement for clean production. The invention has the advantages of advanced production process, good product quality and high value, wherein the fluorine content of the aluminum fluoride is high and between 63-65 percent; the quality index of the obtained white carbon black meets the requirement on the standard of the chemical industry; and the quality of the 4A zeolite product meets the requirements on the national standard and the standard of European and American developed countries.
Owner:四川励志环保科技有限公司

Method for preparing coal gas, top-grade active carbon, water glass and silicate phosphate from rice hulls

The invention relates to a method for preparing coal gas, high-grade active carbon, water glass and silicate phosphate from rice hulls, which comprises the following steps of: smouldering, carbonizing and activating the rice hulls to produce the coal gas for power generation and to obtain rice hull carbon; activating the rice hull carbon with acid and alkaline to obtain low-grade active carbon, packaging the low-grade active carbon in a dust-proof explosion-proof sealed mode, and activating at moderate temperature, secondary high temperature and high temperature to finally obtain the high-grade active carbon and produce the water glass and the silicate phosphate simultaneously. The defect of low-grade active carbon prepared from the rice hull carbon in the prior art is overcome. The invention has reasonable technological method and technological process, and solves the technical obstacles on moderate temperature and high temperature activation of the rice hull carbon. The rice hull carbon obtained after preparing the coal gas from the rice hulls can be directly used for producing the high-grade active carbon, the water glass and the silicate phosphate, and the economical benefits and the social benefits of the rice hulls are effectively increased. Large-scale industrial production can be realized, and a new approach is provided for realizing a complete industrial chain of agriculture industrialization and rice processing.
Owner:长沙稻香农业科技有限公司

Process for preparing water glass from silicon micropowder by using wet method

InactiveCN102424394ASolve bulk consumptionSolve technical barriers to high-value utilizationAlkali metal silicatesBuffer tankEconomic benefits
The invention provides a process for preparing water glass from silicon micropowder by using the wet method, belonging to the technical field of production of water glass. The process comprises the following steps: analyzing the content of SiO2 in silicon micropowder; mixing silicon micropowder and liquid alkali according to a mol ratio of 0.9-1.8:1; delivering obtained mixed liquor into a liquidphase reaction vessel under agitation; allowing steam to enter into the reaction vessel to heat the mixed liquor; carrying out a dwell reaction at a temperature of 70 to 220 DEG C for 0.5 to 6 h so as to prepare mixed liquor of water glass; discharging the mixed liquor of water glass out from the reaction vessel; adjusting the temperature of the mixed liquor of water glass to 50 to 95 DEG C in a feed liquid buffer tank; carrying out plate and frame pressurized filtering to obtain a filtrate which is water glass with a modulus of 1.80 to 3.20. The invention has the following advantages: since the water glass is prepared by using dust in the ferrosilicon alloy industry as a raw material and employing the characteristic that the reaction between amorphous SiO2 in silicon micropowder and alkali liquid has high activity, high conversion efficiency is obtained, the process is simple, the problem of dust pollution in the ferrosilicon alloy industry is overcome, and good economic benefits andsocial benefits are achieved.
Owner:UNIV OF SCI & TECH BEIJING +1
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