Method for preparing caustic calcined magnesite from magnesite flotation tailings

A technology for flotation tailings and light calcined magnesia, which is applied in the field of magnesite flotation tailings to prepare light calcined magnesia, can solve the problems of lower quality of derivative products, non-compliance with sustainable development, and reduced MgO content, etc. Improve resource utilization, low cost, and promote the effect of decomposition

Active Publication Date: 2019-07-23
DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the rough management of magnesite resources, there is a relative shortage of high-quality resources
What is more noteworthy is that a large amount of waste of low-grade magnesite not only causes a huge waste of resources, but also pollutes the surrounding environment
The main impurities in magnesite include CaO, Al 2 o 3 , SiO 2 , Fe 2 o 3 Etc., high impurity content will directly lead to the reduction of MgO content in magnesite, and then lead to the consequences of the quality de

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing light burnt magnesia from magnesite flotation tailings, comprising the following steps:

[0026] (1) Mix the magnesite flotation tailings and the admixture according to the mass percentage: 95% of the magnesite flotation tailings and 5% of the admixture to obtain a mixture;

[0027] (2) Add the mixture in step (1) to 6% of the binder, and stir for 30 minutes;

[0028] (3) Press the uniformly stirred material in step (2) into spherical particles under 250MPa;

[0029] (4) Send the spherical particles in step (3) into a drying kiln for drying at a drying temperature of 80°C and keep them warm for 8 hours at this temperature;

[0030] (5) Send the spherical particles dried in step (4) into a rotary kiln to raise the temperature to 120°C, keep the temperature for 3 hours, then raise the temperature to 680°C, keep the temperature for 2 hours, and then cool to room temperature;

[0031] (6) Washing and filtering the roasted material in step (5) with c...

Embodiment 2

[0034] A method for preparing light burnt magnesia from magnesite flotation tailings, comprising the following steps:

[0035] (1) Mix the magnesite flotation tailings and the admixture according to mass percentage: 96% of the magnesite flotation tailings and 4% admixture to obtain a mixture;

[0036] (2) Add the mixture in step (1) to 7% of the binder, and stir for 25 minutes;

[0037] (3) Press the uniformly stirred material in step (2) into spherical particles under 280MPa;

[0038] (4) Send the spherical particles in step (3) into a drying kiln for drying at a drying temperature of 90°C and keep them warm for 6 hours at this temperature;

[0039] (5) Send the spherical particles dried in step (4) into a rotary kiln to raise the temperature to 150°C, keep it warm for 2.5h, then raise the temperature to 690°C, keep it warm for 1.5h, and then cool to room temperature;

[0040] (6) Washing and filtering the roasted material in step (5) with clean water to obtain a lightly bu...

Embodiment 3

[0043] A method for preparing light burnt magnesia from magnesite flotation tailings, comprising the following steps:

[0044] (1) Mix the magnesite flotation tailings and the admixture according to mass percentage: 97% of the magnesite flotation tailings and 3% of the admixture to obtain a mixture;

[0045] (2) Add the mixture in step (1) to 8% of the binder, and stir for 20 minutes;

[0046] (3) Press the uniformly stirred material in step (2) into spherical particles under 300MPa;

[0047] (4) Send the spherical particles in step (3) into a drying kiln for drying at a drying temperature of 100°C, and keep warm at this temperature for 5 hours;

[0048] (5) Send the spherical particles dried in step (4) into a rotary kiln to raise the temperature to 180°C, keep the temperature for 2 hours, then raise the temperature to 700°C, keep the temperature for 1 hour, and then cool to room temperature;

[0049] (6) Washing and filtering the roasted material in step (5) with clean wat...

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Abstract

The invention provides a method for preparing caustic calcined magnesite from magnesite flotation tailings. The method comprises the following steps: mixing materials, pelletizing, drying, roasting, washing, filtering and the like. According to the method, anhydrous magnesium chloride, magnesium chloride hexahydrate and corn starch are added into the magnesite flotation tailings to be compressed into compact balls; in a calcining process, activation energy hindering sintering is reduced; in addition, the anhydrous magnesium chloride and the magnesium chloride hexahydrate decompose out chlorideions in a roasting process, the chloride ions can promote magnesite decomposition in the roasting process, a magnesite flotation tailing roasting temperature is reduced, energy consumption is reduced, calcium carbonate in the tailings is simultaneously converted into calcium chloride, the calcium chloride is removed through washing, and an effect of removing calcium is achieved. According to themethod disclosed by the invention, the magnesite flotation tailings are utilized as a main raw material, and the magnesite flotation tailings have the advantages of wide sources and low cost; thus, the problem of environmental pollution caused by stockpiling the magnesite flotation tailings is solved, resourceful and reasonable utilization of the magnesite tailings is simultaneously achieved, theresource utilization rate is improved, and land occupation of the magnesite tailings is reduced.

Description

technical field [0001] The invention relates to the field of solid waste utilization and environmental protection, in particular to a method for preparing light-burned magnesite from magnesite flotation tailings. Background technique [0002] my country is rich in magnesite resource reserves, with proven reserves of about 3.1 billion tons, accounting for a quarter of the world's total reserves, mainly distributed in Liaoning and Shandong provinces, whose total reserves account for about 95.11% of the country's total reserves, of which Liaoning The province is mainly concentrated in the southern part of Liaoning, such as Haicheng, Yingkou and other areas. There are 12 proven mining areas with reserves of 2.577 billion tons, accounting for about 85% of the country's total reserves and 20% of the world's total reserves. However, due to the continuous development of magnesite resources and the continuous improvement of raw material requirements for high value-added magnesium salt...

Claims

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Application Information

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IPC IPC(8): C04B2/10
CPCC04B2/005C04B2/102C04B2/104
Inventor 李伟高树龙王酉宁赵小江
Owner DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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