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A kind of magnesia expansion agent prepared by using high-calcium magnesite tailings and its preparation method

A technology of high-calcium magnesite and mine tailings, applied in the field of preparation of expansion agent, can solve the problems of secondary environmental pollution, high cost, complicated treatment process, etc., and achieve the effect of reducing production cost and significant social and economic benefits.

Active Publication Date: 2021-08-03
ZHENJIANG SOBUTE NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems that the high-calcium magnesite tailings are complicated in quality improvement and impurity reduction treatment process, high in cost, and prone to secondary environmental pollution, the present invention provides a kind of high-calcium magnesite utilizing simple process and high economic value. Method for preparing magnesium expansion agent from tailings

Method used

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  • A kind of magnesia expansion agent prepared by using high-calcium magnesite tailings and its preparation method
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  • A kind of magnesia expansion agent prepared by using high-calcium magnesite tailings and its preparation method

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Embodiment 1

[0029] First, 92 parts of high-calcium magnesite tailings and 8 parts of aluminum hydroxide are mixed according to the proportion and then ground together to 250 mesh to make raw meal powder, and then the raw meal powder after grinding is heated at 1000 °C Calcined under high temperature, and kept at this temperature for 80 minutes, after the heat preservation was completed, the calcined material was taken out to cool in the air, and finally the cooled calcined material was ground to a specific surface area of ​​350m 2 / kg, a kind of magnesium expansive agent HME-1 prepared by utilizing high-calcium magnesite tailings of the present invention is obtained.

Embodiment 2

[0031]First, 95 parts of high-calcium magnesite tailings and 5 parts of aluminum hydroxide are mixed according to the proportion, and then they are jointly ground to 300 mesh to make raw meal powder, and then the raw meal powder after grinding is heated at 1050°C Calcined under high temperature, and kept at this temperature for 60 minutes, after the heat preservation was completed, the calcined material was taken out to cool in the air, and finally the cooled calcined material was ground to a specific surface area of ​​300m 2 / kg, a kind of magnesia expansion agent HME-2 prepared by utilizing high-calcium magnesite tailings of the present invention is obtained.

Embodiment 3

[0033] First, 90 parts of high-calcium magnesite tailings and 10 parts of aluminum hydroxide are mixed according to the proportion, and then they are jointly ground to 280 mesh to make raw meal powder, and then the raw meal powder after grinding is heated at 950°C Calcined under high temperature, and kept at this temperature for 90 minutes, after the heat preservation was completed, the calcined material was taken out to cool in the air, and finally the cooled calcined material was ground to a specific surface area of ​​400m 2 / kg, a kind of magnesia expansion agent HME-3 prepared by utilizing high-calcium magnesite tailings of the present invention is obtained.

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Abstract

The invention discloses a magnesia expansion agent and a method prepared by using high-calcium magnesite tailings. The magnesia expansion agent of the present invention uses high-calcium magnesite tailings as the main raw material, and uses aluminum hydroxide as the adjusting material. It was prepared by calcination at 1050°C. The present invention utilizes the Al produced by the decomposition of aluminum hydroxide 2 O 3 Absorb the f-CaO produced by the decomposition of high-calcium magnesite tailings to form the cementitious substances monocalcium aluminate and dodecalumina heptaaluminate, which significantly reduces the production of magnesite expansion agent from high-calcium magnesite tailings. The content of f-CaO solves the social problem of high-calcium magnesite tailings causing pollution to the ecological environment, expands the direction for the high value-added application of high-calcium magnesite tailings, and reduces the use of magnesite expansion agents. The production cost provides market competitiveness for the promotion and application of magnesium expansion agent in water conservancy and hydropower projects, and has significant social and economic benefits.

Description

technical field [0001] The invention relates to a method for preparing an expansion agent, in particular to a method for preparing a magnesium expansion agent by using high-calcium magnesite tailings. Background technique [0002] Magnesite is a non-metallic mineral mainly containing magnesium carbonate. It is an important source of metallic magnesium and magnesium materials, and is an important national strategic resource. Among the magnesite resources owned by my country, low-grade magnesite accounts for nearly half of the total reserves. After decades of mining, quite a few high-quality magnesite mines have been severely damaged, high-grade magnesite resources are decreasing day by day, and a large number of low-grade magnesite mines have been abandoned. CaO in magnesite ore will form CaSiO with silicon-containing impurities during calcination 3 During the cooling process, the refractory material is easy to turn and become loose, and the high-calcium magnesite with high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/08
CPCC04B40/0046C04B22/066C04B22/0093
Inventor 刘加平张守治王瑞王育江陈开胜穆松
Owner ZHENJIANG SOBUTE NEW MATERIAL CO LTD
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