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Method for preparing calcium silicate board from low-grade limestone

A low-grade limestone and calcium silicate board technology, which is applied in lime production and other fields, can solve the problems of complex cement production process and high technical requirements, and achieve the effects of prolonging the service life, saving natural resources and saving energy

Active Publication Date: 2017-06-13
武钢资源集团乌龙泉矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The calcium raw material needed in the production of calcium silicate board is mainly quicklime, and the grade requirement of quicklime is not as high as that of metallurgical lime, especially the content of silicon is not required. The silicon calcium required for the production of calcium silicate board The raw materials are mainly quartz powder, diatomaceous earth, fly ash, etc., and the main impurity component of most low-grade limestone is silicon dioxide (gangue), and some cement factories also use low-grade limestone to produce cement at present, and The production process of low-grade cement is complex and requires high technical requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The composition weight percentage content of low-grade limestone is as shown in table 1:

[0028] Table 1

[0029] element CaO SiO 2

MgO al 2 o 3

Fe 2 o 3

Loss on ignition content(%) 44.32 9.78 2.10 2.18 1.21 38.61

[0030] A method for preparing a calcium silicate board from low-grade limestone, comprising the following steps:

[0031] 1) Crushing and homogenization of low-grade limestone: crush low-grade limestone into 50-100 mm with a jaw crusher, and then homogenize;

[0032] 2) Calcination: Calcining the homogenized low-grade limestone in step 1) in a rotary kiln, controlling the calcining temperature to 1000° C., and controlling the calcining time to 11 hours;

[0033] 3) Digestion: put the calcined low-grade limestone in step 2) into a rotary digester for digestion, control the temperature of the water used to digest the limestone to 60°C, and control the mass ratio of the water used to digest the limestone to...

Embodiment 2

[0038] The composition weight percent content of low-grade limestone is as shown in table 2:

[0039] Table 2

[0040] element CaO SiO 2

MgO al 2 o 3

Fe 2 o 3

Loss on ignition content(%) 42.17 13.43 4.38 1.21 0.93 36.79

[0041] A method for preparing a calcium silicate board from low-grade limestone, comprising the following steps:

[0042] 1) Crushing and homogenization of low-grade limestone: crush low-grade limestone into 50-100 mm with a jaw crusher, and then homogenize;

[0043] 2) Calcination: calcining the low-grade limestone homogenized in step 1) in a rotary kiln, controlling the calcining temperature to 1300° C., and controlling the calcining time to 12 hours;

[0044] 3) Digestion: put the calcined low-grade limestone in step 2) into a rotary digester for digestion, control the temperature of the water used to digest the limestone to 40°C, and control the mass ratio of the water used to digest the limestone to l...

Embodiment 3

[0049] The composition weight percent content of low-grade limestone is as shown in table 3:

[0050] table 3

[0051] element CaO SiO 2

MgO Al 2 o 3

Fe 2 o 3

Loss on ignition content(%) 30 10 5.17 2.48 1.49 50.86

[0052] A method for preparing a calcium silicate board from low-grade limestone, comprising the following steps:

[0053]1) Crushing and homogenization of low-grade limestone: crush low-grade limestone into 50-100 mm with a jaw crusher, and then homogenize;

[0054] 2) Calcination: Calcining the low-grade limestone homogenized in step 1) in a shaft kiln, controlling the calcining temperature to 1200° C., and controlling the calcining time to 10 hours;

[0055] 3) Digestion: put the calcined low-grade limestone in step 2) into a rotary digester for digestion, control the temperature of the water used to digest the limestone to be 80°C, and control the mass ratio of the water used to digest the limestone to limest...

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Abstract

The invention discloses a method for preparing a calcium silicate board from low-grade limestone. The method comprises steps as follows: 1) crushing and homogenization of low-grade limestone; 2) calcination; 3) digestion: the calcined low-grade limestone in Step 2) is digested and transferred into a storage tank; 4) preparation of mixed slurry: a siliceous material, paper fibers and alkali-resistant short glass fibers are added to slurry in the storage tank in Step 3), and mixed slurry is prepared; 5) blank formation: a blank is prepared from the mixed slurry obtained in Step 4) and trimmed; 6) autoclaved curing: the trimmed blank in Step 5) is transferred into an autoclave for autoclaved curing, pressure relief, cooling, drying, edging and sanding are performed, and the calcium silicate board is prepared. The low-grade limestone can be matched and utilized again, the requirement for raw materials in production of the calcium silicate board is met, the production cost is reduced, the green industry is formed, and energy is saved.

Description

technical field [0001] The invention relates to building material production technology, in particular to a method for preparing calcium silicate boards from low-grade limestone. Background technique [0002] Limestone is mainly used for lime paste, cement or metallurgical flux ore, etc., but these applications have relatively high requirements for lime, and many low-grade limestones are discarded in large quantities. These low-grade limestones not only occupy mine tailings pools, but also shorten mine life. If these low-grade limestones can be effectively utilized to turn waste into treasure, a lot of natural resources will be saved, strong vitality will be injected into mines, and power will be provided for sustainable economic development. [0003] Calcium silicate board is made of loose short fibers such as inorganic mineral fibers or cellulose fibers as reinforcement materials, and siliceous-calcium materials as the main cementing material. After pulping, molding, and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/18C04B2/12C04B2/10C04B2/04
CPCY02P40/40
Inventor 张胜毛少波张勇季佳善
Owner 武钢资源集团乌龙泉矿业有限公司
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