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

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.