Method for producing dust-reducing and dust-absorbing material from nonmetallic mineral and raw material from cement plant

Patent metadata

Field	Value
Publication number	US-11518711-B2
Application number	US-202117188087-A
Country	US
Kind code	B2
Filing date	Mar 1, 2021
Priority date	Jun 2, 2020
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant. The method includes calcining the limestone block, to obtain quicklime; cooling the quicklime at ambient temperature, drying and pulverizing the quicklime, to obtain a first powder essentially consisting of a quicklime powder and a calcium carbonate powder; fully drying and grinding a nonmetallic mineral, to obtain a nonmetallic mineral powder; mixing the first powder and the nonmetallic mineral powder, stirring to be uniform, to obtain a mixture, and ball milling the mixture, to obtain a nano-powder; adding a dust-absorbing material to the nano-powder, adding water and mixing, and pouring the resulting mixture into a mold, and stoving; and air drying the resulting mixture, to obtain a cavernous dust-reducing and dust-absorbing material.

First claim

What is claimed is:

1. A method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant, comprising,
step 1, choosing from raw material from a cement plant a limestone block with a moderate volume, and calcining the limestone block, to obtain quicklime;
wherein calcining the limestone block comprises steps:
(1) placing the limestone block in a calcining kiln for calcining;
(2) after decomposing the limestone and swelling a lime grain, stopping heating, and thermally insulating for 1 hour;
(3) cooling the lime grain slowly, extracting carbon dioxide generated during the calcining of the limestone block, and transferring carbon dioxide to a container;
(4) under the condition that the pressure in the calcining kiln is less than 1.6 MPa, stopping extraction of carbon dioxide, and opening the calcining kiln for a ventilation, to obtain quicklime; and
(5) stirring and cooling quicklime;

step 2: cooling quicklime at ambient temperature, drying and pulverizing quicklime, to obtain a first powder essentially consisting of a quicklime powder and a calcium carbonate powder;
wherein drying and pulverizing quicklime comprises a step:
placing the cooled quicklime into a drying equipment for drying, introducing the dried quicklime into a pulverizer to pulverize; and sieving with a fine sieve to obtain a fine powder and remove coarse particles;

step 3, fully drying and grinding a nonmetallic mineral, to obtain a nonmetallic mineral powder;
wherein grinding the nonmetallic mineral comprises steps:
3.1) adding an appropriate amount of a nonmetallic mineral after drying into a grinder, adding enough lubricating oil into a refueling bottle of the grinder via an oil inlet pipe to lubricate a grinding wheel of the grinder while rotating, starting the grinder and grinding the nonmetallic mineral, to obtain a preliminarily-ground nonmetallic mineral;
3.2) introducing the preliminarily-ground nonmetallic mineral into a stirring mill, rotating a stirring shaft of the stirring mill in one direction at a high speed for 10-20 minutes, causing violent collisions between the preliminarily-ground nonmetallic minerals, thereby further crushing the preliminarily-ground nonmetallic mineral, and rotating the stirring shaft of the stirring mill in the other direction at a high speed for 10-20 minutes, thereby yet further crushing the preliminarily-ground nonmetallic mineral, to obtain a mixture A; and
3.3) grinding the mixture A with the grinder again for 1-2 hours, to obtain a fully-ground nonmetallic mineral, subjecting the fully-ground nonmetallic mineral to a heat treatment in a heating furnace for 1.5-2 hours, placing the fully-ground nonmetallic mineral after the heat treatment in a refrigerator for a refrigeration, consolidating, to obtain a consolidated nonmetallic mineral, introducing the consolidated nonmetallic mineral into a high-speed vortex machine and pulverizing the consolidated nonmetallic mineral therein, and sieving the resulting nonmetallic mineral twice, to obtain a nonmetallic mineral powder;

step 4, mixing the first powder and the nonmetallic mineral powder, stirring to be uniform, to obtain a mixture, and ball milling the mixture, to obtain a nano-powder;
step 5, adding a dust-absorbing material to the nano-powder, adding water and mixing, pouring the resulting mixture into a mold, and stoving; and
step 6, taking the resulting mixture out after stoving, and air drying the resulting mixture, to obtain a cavernous dust-reducing and dust-absorbing material.

2. The method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant as claimed in claim 1 , wherein in step (1), calcining the limestone block comprises calcining the limestone block at 1050° C. and ambient pressure.

3. The method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant as claimed in claim 1 , wherein the nonmetallic mineral is one or more selected from the group consisting of magmatic rock, sedimentary rock, metamorphic rock, granite, limestone, quartzite, diorite, basalt, quartz sandstone, siliceous conglomerate, granite gneiss, shale, mudstone, chlorite schist, mica schist, basalt, and quartz sandstone.

4. The method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant as claimed in claim 1 , wherein in step 3, fully drying the nonmetallic mineral comprises drying the nonmetallic mineral at 200° C. for 2 hours.

5. The method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant as claimed in claim 1 , wherein in step 3, a speed ratio of the grinder in step 3.1, step 3.2 and step 3.3 is 1:4:8.

6. The method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant as claimed in claim 1 , wherein in step 3.3), the refrigeration is performed at a temperature of −15° C. to −5° C.

7. The method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant as claimed in claim 1 , wherein in step 4, ball milling the mixture comprises steps:
1) placing a mixture of the first powder and the nonmetallic mineral powder in a ball mill, and adding a small amount of absolute ethanol dropwise thereto;
2) ball milling for 10-15 minutes to obtain a ball milled powder, with zirconium dioxide balls as a ball milling medium;
3) air drying the ball milled powder; and
4) sieving the dried ball milled powder, to obtain a nano-powder with a particle size of 10-80 nm.

8. The method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant as claimed in claim 1 , wherein the dust-absorbing material is a combination of two or more of silica gel, activated carbon, diatomaceous earth, activated alumina, and zeolite.

9. The method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant as claimed in claim 1 , wherein in step 5, stoving the mixture comprises stoving the mixture at 120° C. for 10 hours; turning the mixture over during the stoving.

10. A dust-reducing and dust-absorbing material, which is produced by the method for producing a dust-reducing and dust-absorbing material from a nonmetallic mineral and a raw material from a cement plant as claimed in claim 1 .

Assignees

• Univ Shandong Science & Tech

Inventors

• Wang Li
• Gao Dengzheng
• Liu Lihua
• Guo Qingbin
• Xue Zhen

Classifications

• C01F11/18 Primary

  Carbonates · CPC title

• C04B2103/0075

  Anti-dusting agents · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title