METHOD FOR PREPARING MICRON-SCALE SPHERICAL WEIGHTING MATERIAL

WIPO Patent Application WO/2022/100167

A1

A method for preparing a micron-scale spherical weighting material. A high-purity iron concentrate powder with a density ≥4.8 g/cm3 is selected as a raw material, and is subjected to a crushing-air flow classification to obtain micron-powder particles with a particle size distribution D90 of 2-20 μm; electricity is applied to the prepared micro-powder particles, so that the surfaces of the micro-powder particles carry charges with the same electrical property; the micro-powder particles with the same electrical property carried on the surfaces thereof are conveyed to a high temperature spheroidizing furnace through a micro-powder conveying system for spheroidizing same at 1400-1800ºC, same is then conveyed to a cooling device by means of an air flow to finish the surface homogenization of the spherical micro-powder particles, and finally, the micron-scale spherical weighting material is collected by means of a micro-powder collecting device. The spherical weighting material prepared by the method has a density as high as 4.8-5.6 g/cm3, a particle size distribution D90 of 2-40 μm, and a sphericity rate of ≥96%; and same can be widely used in drilling fluids and cement slurries.

XU CHUANHUA (CN)
LIU LEI (CN)
PENG LIFEN (CN)
SUN GUOQUAN (CN)
LIU YAHUI (CN)
WANG GUANGHUI (CN)

PCT/CN2021/111873

May 19, 2022

August 10, 2021

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SINOSTEEL MAANSHAN GENERAL INSTITUTE OF MINING RES CO LTD (CN)
SINOSTEEL MIMR NEW MATERIAL TECH CO LTD (CN)
SINOSTEEL NANJING HUAXIN TECH CO LTD (CN)

C09K8/03; C01G49/02; C01G49/06

CN112226214A	2021-01-15
CN112500840A	2021-03-16
CN112276102A	2021-01-29
CN106753280A	2017-05-31
CN101491784A	2009-07-29
CN101209861A	2008-07-02
CN201404841Y	2010-02-17
TW201334892A	2013-09-01
US4246208A	1981-01-20

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MA'ANSHAN CITY JINQIAO PATENT AGENT LTD. (CN)

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