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Method for preparing calcium and magnesium sand by using high-silicon magnesite tailings

A technology of magnesite and magnesia-calcium sand, which is applied in the field of recovery and utilization of tailings after magnesite selection, can solve the problems of complex process and high cost, and achieve the effects of simple process, fuel saving and cost reduction

Active Publication Date: 2014-10-01
LIAONING DONGHE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, the production of magnesium-calcium refractory materials generally adopts the artificial synthesis method of secondary calcination. The added dolomite needs to be lightly burned at 1000°C, which is complicated in process and high in cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The magnesite-calcium sand produced in this embodiment is mainly raw materials of magnesite concentrate and magnesite tailings, and the magnesite tailings adopts a multi-stage and multi-stage separation method to remove iron and desiliconize the magnesite tailings after beneficiation , the CaO content in the selected magnesite tailings is ≥ 20%; and then the finished magnesite-calcium sand is produced through iron removal and desiliconization, batching, mixing, grinding, pressing, drying, and one-time calcination. The formula raw materials of this product are proportioned according to the following parts:

[0031] 70 parts of magnesite concentrate;

[0032] 30 parts of high-calcium magnesite tailings after iron removal and desiliconization;

[0033] MgO content in magnesite concentrate ≥ 98%;

[0034] CaO content in high-calcium magnesite tailings after iron removal and desiliconization ≥ 20%;

[0035] Production process of the present invention is as follows:

[00...

Embodiment 2

[0038] The magnesite-calcium sand produced in this embodiment is mainly raw materials of magnesite concentrate and magnesite tailings, and the magnesite tailings adopts a multi-stage and multi-stage separation method to remove iron and desiliconize the magnesite tailings after beneficiation , the CaO content in the selected magnesite tailings is more than 20%; and then through the steps of mixing, grinding, pressing, drying, and calcining, the finished magnesite-calcium sand is produced. The formula raw materials of this product are proportioned according to the following parts:

[0039] 75 parts of magnesite concentrate;

[0040] 25 parts of high-calcium magnesite tailings after iron removal and desiliconization;

[0041] MgO content in magnesite concentrate ≥ 98%;

[0042] CaO content in high-calcium magnesite tailings after iron removal and desiliconization ≥ 20%;

[0043] Production process of the present invention is as follows:

[0044] First, the tailings slurry aft...

Embodiment 3

[0046] The magnesite-calcium sand produced in this embodiment is mainly raw materials of magnesite concentrate and magnesite tailings, and the magnesite tailings adopts a multi-stage and multi-stage separation method to remove iron and desiliconize the magnesite tailings after beneficiation , the CaO content in the selected magnesite tailings is more than 20%; and then through the steps of mixing, grinding, pressing, drying, and calcining, the finished magnesite-calcium sand is produced. The formula raw materials of this product are proportioned according to the following parts:

[0047] 80 parts of magnesite concentrate;

[0048] 20 parts of high-calcium magnesite tailings after iron removal and desiliconization;

[0049] MgO content in magnesite concentrate ≥ 98%;

[0050] CaO content in high-calcium magnesite tailings after iron removal and desiliconization ≥ 20%;

[0051] Production process of the present invention is as follows:

[0052] First, the tailings slurry aft...

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Abstract

The invention discloses a method for preparing calcium and magnesium sand by using high-silicon magnesite tailings. A finished product of calcium and magnesium sand is prepared from magnesite tailings through the following steps of: deironing; desilicating; mixing; grinding; compression molding; drying; calcining, wherein the magnesite tailings are generated in the separation and purification processes of magnesite. The calcium and magnesium sand is prepared by mixing magnesite concentrate with high-calcium magnesite tailings instead of dolomite and calcining at one step. Compared with the prior art, the method has the beneficial effects that the calcium and magnesium sand is prepared by mixing the magnesite concentrate with the high-calcium magnesite tailings instead of the dolomite and calcining at one step, so that the process step of sintering is omitted, the energy can be remarkably saved, and the cost can be effectively reduced; meanwhile, waste tailings are effectively utilized, so that the pollution is reduced, the energy is saved, and the aims of saving energy and reducing emission are achieved. In addition, the method is simple in process and capable of reducing the labor intensity.

Description

technical field [0001] The invention relates to the field of recovery and utilization of magnesite tailings after beneficiation, in particular to a method for preparing magnesite-calcium sand from magnesite tailings after beneficiation. Background technique [0002] At present, the refractory materials used in the all-alkaline ladle and tundish in the clean steel production process are mainly magnesium-calcium refractory materials, because of their good high temperature resistance, slag resistance, thermal shock resistance, and stability under high temperature and vacuum At the same time, it has the functions of removing impurities and purifying molten steel, which can meet the requirements of longevity, pollution-free, energy-saving and other requirements of modern smelting, so it is widely used in the lining of thermal vessels for smelting clean steel. [0003] However, at present, the production of magnesium-calcium refractory materials generally adopts the artificial syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 毕胜民
Owner LIAONING DONGHE NEW MATERIAL CO LTD
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