7 results about "Crystalline quartz" patented technology

A variable temperature load (VTL) or noise source including a grounded coplanar waveguide (GCPW) comprising a first metallization patterned on a fused quartz substrate, the first metallization comprising a first end for connecting to a coaxial connector and a second end for connecting to a coplanar waveguide (CPW); the CPW coupled to a 50 ohm termination and comprising a second metallization patterned on a top surface of a crystal quartz substrate; a temperature sensing diode thermally coupled to the crystal quartz substrate and the second metallization; and a heater resistor coupled to the crystal quartz substrate via contact metallization.

The present invention provides a quartz crystal, a quartz device, and an intermediate wafer having a novel shape suitable for use in the manufacture of quartz devices. [Solution] The quartz piece 10 has the XZ' plane defined by the X-axis and Z'-axis of the quartz as its main surfaces 10ca and 10cb, and the Y'-axis of the quartz as the thickness direction, and is an AT-cut quartz piece with a square shape in plan view. When one of the sides along the X-axis is defined as the first side surface 10aa of the X-axis and the other as the second side surface 10ab of the X-axis, and when one of the sides along the Z'-axis is defined as the first side surface 10ba of the second axis and the other as the second side surface 10bb of the second axis, each of these sides is composed of a crystal plane 10e derived from the quartz and a plane having a contour 10fa parallel to the normal 10cc of the main surface of the quartz piece 10 (a plane perpendicular to the main surface).

A transesterification catalyst, a method of producing the transesterification catalyst, and a method of producing a biodiesel using the transesterification catalyst. The transesterification catalyst includes crystalline quartz particles, cristobalite particles, and silicon-substituted hydroxycalcioromerite particles by XRD. The transesterification catalyst is formed by a method involving high temperature calcination of camel dung.

The invention provides modified matt silica powder, a preparation method thereof and application of the modified matt silica powder in matt paint, and belongs to the technical field of fine chemical engineering. Natural crystal type quartz ore is taken as a raw material, superfine silica powder raw powder is obtained by grinding twice, and polyamide wax is adopted for surface modification of the raw powder, so that the diffuse reflection efficiency of the silica powder is improved; hydrophilic fumed silica is compounded, and gamma-methacryloxypropyltrimethoxysilane and catechol are used as modified binders, so that the fumed silica is adsorbed on the surface of the silica micropowder, thereby improving the porosity of the surface of the silica micropowder and improving the extinction effect. When the prepared modified extinction silica powder is independently applied to matte paint, compared with traditional silica powder, the gloss of a paint film can be effectively reduced, and the glossiness required by a product is achieved; compared with gas-phase method silicon dioxide, the silicon dioxide prepared by the preparation method has the rheological property and various mechanical properties of a paint film, and has relatively high universality.

The invention relates to the technical field of purification of inorganic non-metallic materials, in particular to a method for deeply removing grid type Al impurities from an amorphous synthetic quartz material. According to the technical scheme, the method comprises the following steps: chloridizing and roasting: roasting an amorphous synthetic quartz material in a dry hydrogen chloride atmosphere at 900-1200 DEG C; acid leaching is conducted, specifically, the treated sample is subjected to leaching treatment through a mixed acid solution, and mixed acid comprises hydrofluoric acid, nitric acid and hydrochloric acid; and then carrying out solid-liquid separation, washing and drying to obtain the high-purity quartz material. According to the method, a purification object is converted from compact natural crystalline quartz to artificially synthesized amorphous quartz with low density, efficient and deep removal of grid type aluminum impurities is achieved at the medium temperature, and the technical problems of low removal efficiency, high energy consumption and harsh equipment requirements in the prior art are successfully solved.

The present invention relates to a method for preventing the generation of silica gel in red mud leachate. The red mud is dried, crushed, ground, and sieved. The powdered red mud is dissolved in water to produce a slurry, which is allowed to stand and delaminated to obtain a lower layer of dealkalized red mud concentrated slurry. The concentrated red mud slurry is then reselected to obtain red mud concentrate and red mud tailings. The red mud concentrate is further treated by bioflocculation and precipitation to obtain a desiliconized red mud concentrate. The desiliconized red mud concentrate is then subjected to chemical leaching or bioleaching. An H2O2 solution is added to the leaching system. After leaching, the leached liquid is allowed to stand or be filtered to recover valuable metal elements in the filtrate. The trace silicon remaining in the desiliconized red mud concentrate dissolves and then forms a secondary mineralization to form a crystalline quartz precipitate. The present invention effectively removes silicon-containing minerals from the red mud before leaching, removing silicon at the source. During the leaching process, the silicon remaining in the red mud dissolves and then forms a secondary mineralization to form a synchronous crystalline quartz precipitate, thereby maximally suppressing or eliminating the negative impact of silica gel on red mud leaching.

The application discloses a double-grinding synergistic dissociation method of quartz sand. First, the quartz ore is classified into coarse-grained quartz crystal quartz ore and fine-grained quartz crystal quartz ore. For the coarse-grained quartz crystal quartz ore, a first low-intensity grinding treatment is adopted, and the purpose is to remove the intergrowth of quartz and gangue minerals and the surface impurities of the quartz sand, and then a second high-intensity grinding treatment is carried out to grind the quartz sand particles to a proper sand particle size range. For the fine-grained quartz crystal quartz ore, a first high-intensity grinding treatment is adopted, and the purpose is to grind the quartz sand particles to a proper sand particle size range, and then a second low-intensity grinding treatment is carried out to remove the surface impurities. The surface impurities can be better removed through the strong-weak alternating grinding mode, and after the magnetic separation-flotation purification, compared with the traditional grinding mode, the quartz sand concentrate has a higher grade and a lower impurity element content.