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Grinding aid adding method

A grinding aid and grinding technology, which is applied in the field of building materials, can solve the problems of increasing grinding mechanical energy and increasing energy consumption, and achieve the effect of improving grinding efficiency, increasing energy consumption, and good coagulation effect

Active Publication Date: 2020-09-01
CHINA NAT BUILDING MATERIALS TECHCAL INNOVATION & RES INST LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the grinding mechanical energy can increase the particle size, but it will increase energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The six-chamber ball mill used in the production line is used as the ball milling equipment. The equipment parameters are 0.9m in diameter and 2m in length. The weight ratio of balls with three particle sizes is φ21:φ30:φ35=7:4:1, and the filling rate of grinding media is 26%, rotating speed 23r / min, ball milling time 40min; the grinding aid is solid water reducer FDN-A (provided by Laiwu Huijiang Building Materials Co., Ltd.).

[0024] Make a set of blank control data (1#) and four sets of test data (2# to 5#). No. 1#: Add 50kg of desulfurized gypsum raw meal, and after ball milling for 40min, the Blaine surface area is 5174.148cm 2 / g, the particle size corresponding to the Blaine’s surface area is taken as the target particle size; No. 2#: Add 50 kg of desulfurized gypsum raw meal and 0.5 kg of solid water reducing agent at the same time, and ball mill for 40 minutes; No. 3#: Add 50 kg of desulfurized gypsum raw meal, When ball milling until the Blaine specific surf...

Embodiment 2

[0029] The six-chamber ball mill used in the production line is used as the ball mill equipment. The equipment parameters are 0.9m in diameter and 2m in length. The weight ratio of steel balls with three particle sizes is φ21:φ30:φ35=7:4:1, and the filling rate of grinding media is The grinding aid is 26%, and the rotation speed is 23r / min; starch (edible corn starch, provided by Changchun Dacheng Biotechnology Development Co., Ltd.) is selected as the grinding aid.

[0030] 1# Add 50kg of desulfurized gypsum raw meal without adding grinding aids, and the Blaine surface area measured after ball milling for 50min is 5030cm 2 / g, the particle size corresponding to the Blaine surface area is used as the target particle size; 2# adds 5kg grinding aid and 50kg desulfurized gypsum raw meal at the same time, and ball mills to about the target particle size; 3# first adds 50kg desulfurized gypsum raw meal, Desulfurization gypsum raw meal mill until the Blaine specific surface area is ...

Embodiment 3

[0034] Use a star-shaped ball mill model QXQM-2 to mill at a speed of 600r / min. The ball mill has 4 ball mill jars in total. Select one of the ball mill jars as 0#, and put 120g of agate balls and 140g of desulfurized gypsum raw meal in it, and measure The Blaine specific surface area of ​​the desulfurized gypsum raw meal is 900cm 2 / g, Blaine specific surface area measured by ball milling for 2h is 4077.148cm 2 / g, as the target particle size; then number 4 ball milling tanks A, B, C, D, put 120g of the same agate balls in each tank, add desulfurized gypsum raw meal, and perform ball milling under the same conditions. Grinding aid selects starch (edible cornstarch, provided by Changchun Dacheng Biotechnology Development Co., Ltd.).

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Abstract

The invention discloses a grinding aid adding method. The grinding aid adding method comprises the following steps of: grinding a gypsum raw material by adopting a set process until a set requirementis met; and adding a grinding aid into the raw gypsum meeting the set requirements, and continuously grinding an obtained mixture by adopting a set process until raw gypsum particles reach a target particle size. By means of the method, grinding efficiency can be improved under the condition that energy consumption is not increased, and a gypsum particle coagulant with a better coagulation accelerating effect is obtained.

Description

technical field [0001] This application relates to but not limited to the field of building materials, especially a method for adding grinding aids. Background technique [0002] The setting time of gypsum is the key to limit the speed of the domestic gypsum board production line. In order to shorten the setting time, the factory will add finely ground raw gypsum as a setting accelerator. The greater the Blaine specific surface area and BET specific surface area of ​​raw gypsum particles, the better the coagulation-promoting effect. [0003] In the process of grinding raw gypsum, with the prolongation of ball milling time, the particles of raw gypsum are gradually refined, the specific surface energy increases, and the agglomeration phenomenon is serious. When the refinement and agglomeration of raw gypsum particles reach a balance, the particle size reaches a stable state and no longer decreases. At this time, the raw gypsum particles can be further refined by increasing ...

Claims

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Application Information

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IPC IPC(8): C04B11/00C04B11/26
CPCC04B11/005C04B11/264
Inventor 戚婷婷丛宇张赫李帆陈红霞冉秀云白风华贾严严
Owner CHINA NAT BUILDING MATERIALS TECHCAL INNOVATION & RES INST LIMITED
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