255 results about "Size fractions" patented technology

Novel nanosized kaolin clay particles are prepared by agitating a fine particle size fraction of kaolin clay in a Netzsch mill until the particle size is reduced, aspect ratio is decreased and surface area is increased. The ultrafine kaolin particles are especially useful as a pigment to provide high surface gloss to ink jet printing papers.

The invention discloses a composite sodium salt for producing sodium stannate from cassiterite concentrate and an application of the composite sodium salt. The composite sodium salt consists of 70%-90% of sodium carbonate, 5%-20% of sodium bicarbonate, 2.5%-5% of sodium borate and 2.5%-5% of sodium humate by mass. When the composite sodium salt is used, the composite sodium salt is ground to the particles with the size fraction of minus 0.1mm being no less than 90% by mass, the cassiterite concentrate of the fine fraction and the composite sodium salt are mixed according to the mass ratio of 1:(0.5-2), pelletized and dried, coke powder or anthracite is taken as a reducing agent, the mixture is calcined for 30 minutes-90minutes at the temperature of 800 DEG C-950 DEG C, and the cooled calcined product is ground, leached, filtered, purified, concentrated and crystallized, so that the sodium stannate product is obtained. The adopted composite sodium salt is reasonable in component, can be widely obtained, is low in price, is easy to obtain and does not cause pollution to the environment. With the composite sodium salt, the stable crystal structure of the cassiterite concentrate can be obviously damaged, and the composite sodium salt can be widely applied to various cassiterite concentrates so as to directly produce sodium stannate.

A developer for developing an electrostatic latent image is formed from toner particles each comprising a binder resin and a colorant, inorganic fine powder having a number-average particle size of 4-80 nm based on primary particles, and electroconductive fine powder. The developer is characterized by having a number-basis particle size distribution in the range of 0.60-159.21 mum including 15-60% by number of particles in the range of 1.00-2.00 mum, and 15-70% by number of particles in the range of 3.00-8.96 mum, each particle size range including its lower limit and excluding its upper limit. As a result of inclusion an appropriate amount of the electroconductive fine powder represented by the particle size fraction of 1.00-2.00 mum, the developer is suitably used in an image forming method including a contact charging step of charging the image-bearing member based on the direct injection charging mechanism and also in an image forming method including a developing-cleaning step of developing the electrostatic latent image and recovering the developer remaining on the image-bearing member after the transfer step.

The invention discloses a two-stage flotation process for low-grade mixed potassium salt. The process comprises the following steps: (1) grinding low-grade mixed potassium salt until content of the salt with size fraction of -0.15mm is no less than 64.90% by mass; (2) transferring ore pulp obtained from the step (1) to a flotation machine for the first stage of flotation; (3) adding an anionic collector to coarse ore pulp obtained from the step (2) for the second stage of flotation; (4) totally combining potassium chloride concentrate obtained from the step (2) with the second stage of flotation concentrate obtained from the step (3), adding fresh water at a mass ratio of the concentrate to the fresh water of 1: (0.65-0.80), stirring at normal temperature and conducting a conversion reaction fore 1-2h, filtering and drying to obtain a finished potassium sulfate fertilizer product. The process disclosed by the invention has such advantages as simple process, low energy consumption, easy implementation of operation and high K<+> recovery rate, and is suitable for recovering a potassium resource from some low-grade mixed potassium salt complex in potassium mineral composition through flotation.

The invention discloses a mine dust grading combined dust fall device. A primary dust fall system is formed by an inner spraying device and an outer spraying device which are arranged in a coal cutter or a heading machine. The mine dust grading combined dust fall device comprises a secondary haze transform system formed by an ultrasonic wave dry haze generator and a tertiary drizzle wall haze fall system formed by a drizzle generating device. By means of the mine dust grading combined dust fall method and device, conventional instantaneous point dust fall is changed into segmental process dust fall, mine dust different size fraction can be inhibited and reduced by forming water mist particles or gas water mist particles different in particle diameter, and particle diameter grading, segmental inhibition and reduction and process transformation of mine dust in wind current of mining ports are achieved. The mine dust grading combined dust fall device can move along with pushing of the mining points and has functions of automatic control and rain stopping when people go out, dust fall efficiency is high, and dust inhibition, dust fall, explosion protection, fire protection, temperature reduction and drag reduction of return current are achieved by humidifying dirty wind. Compared with the conventional dust fall method, dust fall effect is obvious.

The invention discloses a full-size-fraction dry separation clean process and system for coal-series coexisting and associated mineral resources. According to the process, after to-be-separated raw ore is broken and screened, oversize products enter a photoelectric separation machine to be subjected to tailing removal, products of two size fractions are obtained by further screening undersize products after drying, the undersize products enter a compound dry separation machine and a dry dense medium fluidized bed separation machine correspondingly to be subjected to separation, and concentrateand tailing are obtained; after medium solid brought out by the products is removed through a medium draining screen, one part of the medium solid enters a magnetic separation machine to be subjectedto non-magnetic material removal, magnetic material concentrate is then obtained and flows back to enter the separation machines, and the other part of the medium solid is directly recycled. The system comprises a raw ore preparation and drying part, a separation part and a medium purification circulation and density control part. By means of the full-size-fraction dry separation clean process and system, the coal-series coexisting and associated mineral of different large, medium and small particle sizes can be efficiently separated at the same time, and the problems that at present, in thedry separation field, the number of separated products is small, the concentrate quality is poor, the medium utilization rate is low and dust is excessively discharged are solved.

The invention relates to a multi-layer multi-size fraction composite prefilling sieve tube suitable for sand prevention of silty-fine sand. The multi-size fraction composite prefilling sieve tube suitable for the sand prevention of the silty-fine sand comprises a base tube, an internal wire winding layer, a multi-size fraction composite filling layer, an external wire winding layer and an externalprotection cover in sequence from inside to outside, wherein the outer surface of the base tube is sleeved with the internal wire winding layer, the outer portion of the internal wire winding layer is sleeved with the multi-size fraction composite filling layer, the multi-size fraction composite filling layer is composed of three layers, gravels fill the gaps between the layers, the thickness ofeach layer is different from that of other layers, and the grain sizes of the gravels of different gaps between different layers are different; the outer portion of the multi-size fraction composite filling layer is sleeved with the external wire winding layer, and the external protection cover serves as the outermost layer. Compared with existing methods of gavel filling sand prevention and mechanical sieve tube sand prevention, the multi-layer multi-size fraction composite prefilling sieve tube has the advantages that the sand prevention layer is thick, the useful life is long, the sand prevention layer function and the circulation function can both provided, and the sand prevention effect and oil-gas well high yield are kept. The multi-layer multi-size fraction composite prefilling sieve tube suitable for the sand prevention of the silty-fine sand is suitable for the sand prevention of petroleum, natural gas and natural gas hydrate silty-fine sand.

The invention discloses a novel mineral separation process for gravity separation of useful minerals such as magnetite, apatite, ilmenite and sulfide minerals and a product obtained by implementing the process. The product comprises powdered iron minerals, apatite concentrate, the ilmenite, brass concentrate and sulfur concentrate. The mineral separation process is simple, easy to implement, fine in mineral separation effect and high in working efficiency, sufficiently takes the advantage that the sulfide minerals can be sorted by recovering apatite agents, and the drawback of no recovery of the sulfide minerals in a traditional process is eliminated. The comprehensive utilization rate of resources is increased, useful resources are maximally recovered, the magnet grain size of ultra-low-grade magnetite is non-uniform, qualified concentrate can be separated according to gravity and timely extracted, energy waste due to the fact that qualified concentrate is outputted only when all materials are grinded to below a certain size fraction in the past is avoided, process flow is simplified, cost is reduced, the advantages of various devices are maximally taken, the resources are sufficiently used, and wide popularization and application are facilitated.