30 results about "Nephelinite" patented technology

Aqueous coating composition having a PVC from 78 to 85% and free of non-fugitive coalescing solvent, comprising, based on the total volume solids of the dry coating unless otherwise stated,a) opacifying pigment particles comprising from 3 to 10% titanium dioxide and from 0 to 20% of hollow polymeric particles;b) non-opacifying extender particles comprising calcium magnesium carbonate and / or calcium carbonate and / or nepheline syenite and / or kaolin;c) polymer binder particles of calculated Fox Tg of from 5 to 25° C. having an acid value of from 15 to 65 mg KOH / g of polymer;d) dispersant having weight average molecular weight of at least 3500 Daltons, and wherein the dispersant demand of a mixture of the opacifying pigment particles, other than the hollow polymeric particles, of a) and the extender particles of b) is greater than 0.35 wt %, calculated on the weight of the titanium dioxide and extender particles;e) fugitive coalescing solvent.

The invention discloses a method for separating potassium oxide from a potassium-containing sodium aluminate solution, relating to a method comprising the steps of in the production of aluminum oxide, introducing SO4<2-> by adding one or a mixture of more of sodium sulfate, aluminum sulfate (basic aluminum sulfate) and an alunite ore into seeded precipitation evaporation liquor, converting potassium oxide into potassium sulfate, and performing precipitation and separation in a form of sodium aphthitalite, wherein the precipitation is implemented under high-causticizing alkali and low-temperature conditions, so that residual sodium sulfate in the solution can be avoided, and the solution can be purified; sodium aphthitalite can be used for dissolving and separating out a potassium sulfate product by virtue of variable temperature, and sodium sulfate can be recycled; or a high-potassium low-sodium ore is used for generating a pure potassium aluminate solution by using a limestone sintering method, and then the pure potassium aluminate solution is subjected to a replacement reaction with sodium aphthitalite to generate potassium sulfate and sodium aluminate; potassium chloride also can be used for converting sodium aphthitalite into pure potassium sulfate. The method disclosed by the invention can be used for producing aluminum oxide and potassium sulfate by adopting nepheline and the alunite ore by virtue of a multiple process technology, and also can be used for producing chemicals namely aluminum oxide and potassium sulfate by adopting high-silicon ores such as potassium feldspar, lepidolite and illite by virtue of an acid-alkali combination method.

The invention relates to novel technology for producing novel silicon-based composite material by mixing nepheline glass ceramic and metal, in particular to a nepheline glass ceramic and metal powder composite material and a preparation method thereof. Nepheline glass ceramic powder and the selectively matched metal powder are prepared into novel iron-based, copper-based and aluminum-based composite materials. The glass ceramic powder is mixed with the metal powder, and a whisker is added to realize regrowth so as to improve the toughness; therefore, a novel high-strength composite material is obtained. The preparation method comprises the following steps of: crushing the selectively matched nepheline glass ceramic powder into fine powder with the particle size of 100 to 300 meshes, mixing with the selected metal powder, pressing into a blank, sintering and crystallizing in a crystallization furnace, forming by using a second hot extrusion mold, toughening by using a belt kiln, annealing, and finishing to prepare a high-strength product. The nepheline glass ceramic and metal powder composite material overcomes the defect of low physical and chemical properties of pure metal, and reduces the cost by 50 to 80 percent compared with a metallurgical product of pure metal powder.

The invention relates to a method for synthesizing potassium nitrate as a by-product of nanometer kaolinite with kaliophilite powder bodies, and belongs to the field of preparation of fine chemical materials. The technology comprises the following steps: mixing the kaliophilite powder bodies with a nitric acid solution, performing a hydrothermal reaction under the condition of 210-250 DEG C for 12-36 hours, and performing synthesis so as to obtain a solid phase product, namely the nanometer kaolinite, and a liquid phase product, namely a potassium nitrate solution. According to the method disclosed by the invention, the kaliophilite powder bodies and the nitric acid are used as raw materials, the nanometer kaolinite and the by-product namely the potassium nitrate are synthesized, and components of potassium, aluminum and silicon in kaliophilite are fully utilized, so that the technology of the whole process is simple, modern industrial requirements of 100% resource utilization rate, zero discharge of waste gas, waste water and industrial residues, high efficiency, energy conservation and clean production can be met, and industrialized production is easy to realize.

The invention discloses a technique for preparing agricultural potassium sulfate by taking kaliophilite powder as a raw material, and the technique comprises the following steps: evenly mixing the kaliophilite powder, distilled water and sulfuric acid; controlling the reaction conditions; controlling the dissolution rate of potassium oxide in kaliophilite to reach more than 95wt% and the dissolution rate of aluminum oxide to be less than 0.5wt%; filtering and separating after the reaction, wherein the filtrate is a potassium sulfate solution; and finally, carrying out evaporation and crystallization, thus obtaining the agricultural potassium sulfate product, wherein the filter cake is a silicon-aluminum compound which can be used for preparing products such as aluminum oxide, white carbonblack and the like. The technique is simple, mild in reaction condition and low in production cost.