16 results about "Particulate suspension" patented technology

The invention relates to the field of preparation of modified double-base propellants, in particular to a preparation process of a modified double-base propellant absorbing drug with uniformly dispersed solid components. The preparation process comprises the following steps: putting the dispersing agent into an absorption kettle according to a feeding sequence, then putting a particle suspension prepared from the white material, the RDX, the aluminum powder and the catalyst into the absorption kettle, and heating, stirring and absorbing in a water medium to obtain absorption slurry. On the basis of a traditional double-base propellant stirring absorption process, a dispersing agent is added to help absorption, the sedimentation problem of a catalyst and RDX in a propellant formula is effectively solved through the effects of electrostatic repulsion and steric hindrance, and an absorption drug with uniformly dispersed solid components is obtained.

The present invention relates to a device (1) for reducing a particle density of a sample of a suspension of particles in a liquid, the device comprising a measurement flow path (13) for characterizing the sample of the suspension, wherein the device (1) is configured to withdraw a sample of the suspension residing in a main vessel (100), and to dilute the sample, particularly when a measure indicative of the particle density in the sample is above a pre-defined threshold.

The application discloses a method for ultrasonic intensification treatment of low-concentration vanadium solution, which comprises the following steps: (1) filtering the vanadium-containing solution to be treated to remove the particulate suspensions in the vanadium solution; (2) adjusting the pH of the vanadium solution filtered in the step (1) to 4-8; (3) feeding the vanadium solution with the adjusted pH in the step (2) into a reactor and adding a vanadium removal agent; (4) starting a multi-frequency combined ultrasonic device to perform ultrasonic intensification treatment; and (5) performing solid-liquid separation to obtain a purified solution with a vanadium concentration less than 1 ppm.

The invention provides an aluminum-silicon co-permeation super-hydrophobic coating for surface treatment permeation catalysis and a preparation method, and belongs to the technical field of material surface coatings. The preparation method comprises the steps that shot blasting treatment is conducted on a workpiece, the surface of the workpiece subjected to shot blasting treatment is coated with aluminum-silicon slurry at a time, drying curing and sintering treatment are conducted, and the aluminum-silicon high-temperature corrosion-resistant coating is obtained on the surface of the workpiece; the surface of the aluminum-silicon high-temperature corrosion-resistant coating is coated with a layer of HDTMS modified super-hydrophobic Al2O3 nano-particle suspension liquid, and the super-hydrophobic coating is formed on the surface of the aluminum-silicon high-temperature corrosion-resistant coating through air drying treatment. The method is suitable for various metal parts such as carbon steel, austenitic steel and high-temperature alloy, and the prepared metal powder coating is good in surface quality, high in production efficiency and excellent in corrosion resistance and oxidation resistance.

The application discloses a method for efficiently preparing lignin nanoparticles with a hollow structure and application thereof, and belongs to the technical field of material grading and purification. The method comprises the following steps: lignin is prepared into a nanoparticle suspension through a reverse solvent precipitation method, and the prepared lignin nanoparticle suspension is graded by controlling a centrifugal speed, so that the lignin nanoparticles with the hollow structure are obtained. The method has the advantages of simple operation, short time consumption, high efficiency, green environmental protection, low cost and easy industrial production. Meanwhile, vancomycin can be loaded by adding the vancomycin in a self-assembly process, so that a new idea is provided for high-value utilization of lignin.

An apparatus and method to test particulate suspension in a liquid. The apparatus includes: a hollow cylindrical container including a transparent wall defining therein an open cylindrical area; and a member including a solid cylindrical outer wall, the member positionable within the open cylindrical area with a gap between the solid cylindrical outer wall and the transparent wall, the hollow cylindrical container and the member being configured so that liquid to be tested is contained in the open cylindrical area between the member and the hollow cylindrical container and either the hollow cylindrical container or the member is configured to be rotated.

The invention belongs to the technical field of mesoporous functional materials, and particularly discloses a submicron mesoporous alumina ball and a supergravity preparation method thereof, the preparation method comprises the following steps: step S1, continuously preparing an ultra-small aluminum hydroxide nanoparticle suspension; s2, continuously preparing submicron aluminum hydroxide balls; and step S3, preparing the submicron mesoporous alumina ball. According to the submicron mesoporous alumina ball and the supergravity preparation method thereof disclosed by the invention, through innovative process design, accurate preparation of the high-pore-volume mesoporous alumina ball can be realized under the conditions of no template agent and no additive, and meanwhile, the problems of difficulty in large-scale mass production, poor product uniformity and high cost of a traditional process are effectively solved; and a functional material with excellent performance can be provided for the fields of high-end catalyst carriers, large-capacity adsorbents, high-temperature heat-insulating ceramics and the like.

A lubricating grease includes calcium carbonate about 25 wt.% - 75 wt.% of the lubricating grease, and the calcium carbonate forms a stable particle suspension or a colloidal dispersion in the lubricating grease. The lubricating grease further includes a base oil at a balanced amount

One aspect of the present disclosure pertains to a connector for conveying a suspension of particles through a system, comprising: a housing (10) comprising an internal cavity (12) and a first passageway (14) for conveying fluid; two or more inlet conduits (16a, 16b, 16c, 16d) formed in the housing and arranged radially with respect to a longitudinal axis of the first passageway; and a rotatable component (18) received in the internal cavity of the housing and rotatable about the longitudinal axis of the first passageway such that a continuous flow path can be established between the first passageway and a selected inlet conduit; wherein an angle between each of the inlet conduits and the first passageway (22) is greater than 90 degrees. Other aspects pertain to systems that employ such a connector and to methods of using such systems.

This utility model discloses a device for preparing a constant-head, constant-concentration particulate suspension, comprising: a stirring tank with an open top for storing the prepared particulate suspension; an electric stirrer inserted into the stirring tank to mix the liquid inside; and a constant-head assembly. In this utility model, the raw materials to be prepared are added to the stirring tank and uniformly stirred by the electric stirrer until the concentration at each location is consistent and meets the experimental requirements. Then, a peristaltic pump draws the suspension from the stirring tank into an overflow tank. When the liquid level in the overflow tank is higher than the overflow pipe, the suspension is discharged through the overflow pipe and flows to the experimental equipment. By adjusting the height of the overflow tank on the adjusting bracket, the head height between the overflow pipe and the experimental equipment can be changed, achieving the purpose of preparing both constant-concentration and constant-head suspensions.

The invention discloses a preparation process of an optical polishing nanoparticle suspension, and particularly relates to the technical field of precision optical processing, and the process comprises six steps of material preparation, nanoparticle pretreatment, disperse system construction, functional auxiliary agent compounding, system blending and refining. The preparation method comprises the following steps: pretreating cerium oxide nanoparticles to prepare CeO2 (at) S < O2 > composite particles, sequentially adding deionized water, an alcohol solvent, a dispersant and the CeO2 (at) S < O2 > composite particles, carrying out ultrasonic wave and high shear dispersion to ensure uniform dispersion of the particles, slowly adding a compounded transparent sol and a functional auxiliary agent emulsion into the system, adjusting the pH value to 9.8-10.2, and finally carrying out centrifugation and ultrafiltration refining to obtain the high-purity CeO2 (at) S < O2 > composite particles. The prepared optical polishing nanoparticle suspension is uniform in particle size distribution and excellent in stability. The process is simple, convenient and efficient, the prepared suspension has excellent polishing performance, low surface defect rate and good environmental adaptability, the surface quality and machining efficiency of optical elements are remarkably improved, and the suspension has high application value.

This invention relates to the field of powder metallurgy, specifically to a method for preparing copper selenide micro / nanoparticles. The method includes the following steps: preparing an ultrafine selenium nanoparticle suspension according to a design; uniformly coating the suspension onto a bright copper substrate surface using spin coating or blade coating; heating the copper substrate; and collecting the powder after the substrate cools down to obtain the copper selenide micro / nanoparticles. This invention achieves rapid chemical reaction between the copper substrate and the ultrafine selenium nanoparticles at the micro / nano scale, not only maintaining the uniform size of the copper selenide powder at the micro / nano level but also greatly simplifies the preparation process, enabling one-step preparation of copper selenide ultrafine / nanoparticles and further shortening the preparation time. The raw materials required for this preparation method are readily available and low-cost. Furthermore, the process is simple, the particle size is adjustable, the process is efficient and safe, and the preparation speed is extremely fast, making it very suitable for industrial production.

Mixing techniques and associated device designs for creating a fluid flow within a fluid bag that reduces the accumulation of particles that may settle out of a suspension. A mixer system supports a flexible bag holding fluid for mixing in engagement with a paddle mechanism positioned such that one paddle or paddles are arranged in engagement with a portion of the flexible bag proximate a bottom edge and extending only partially on the bag. Actuating the paddle mechanism to perform repeated displacement and release cycles produces a recirculated flow of fluid within the bag.

A lubricating grease includes calcium carbonate about 25 wt. %-75 wt. % of the lubricating grease, and the calcium carbonate forms a stable particle suspension or a colloidal dispersion in the lubricating grease. The lubricating grease further includes a base oil at a balanced amount.

A measurement cuvette and a method for determining a concentration of a particulate suspension are disclosed. The measurement cuvette is formed of a fully transparent material and has an L-shaped cross section defined by removal of a rectangular notch from a square body. The method comprises introducing a particulate suspension into the cuvette and measuring absorbance at a plurality of optical path lengths including a maximum optical path length, an intermediate optical path length, and a minimum optical path length to obtain corresponding optical density (OD) values. Weighting factors are dynamically calculated based on a functional relationship among the OD values, and the OD values are combined using the calculated weighting factors to generate a final OD value representative of the concentration of the particulate suspension.