A thermal separation process of low-grade hydromagnesite ore

A low-grade hydromagnesite technology, applied in solid separation, chemical instruments and methods, wet separation, etc., can solve the problems of poor sorting effect, poor dispersion, large dust, etc., and achieve good impurity removal effect, Easy drying and good dispersibility

Active Publication Date: 2021-08-03
UNIV OF SCI & TECH LIAONING
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AI Technical Summary

Problems solved by technology

In the sieving process after roasting, the wet sieving with water as the medium has the disadvantages of easy hydration and poor dispersibility; the dry sieving has the disadvantages of large dust, poor dispersibility, and poor sorting effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Thermal separation process of low-grade hydromagnesite ore, 30g hydromagnesite sample is placed in a porcelain crucible and placed in a box-type resistance furnace, at a temperature of 900°C (850°C, 880°C, 900°C, 920°C, Corresponding tests were carried out at 950°C, and the effect of 900°C was the best for this sample), and the hydromagnesite was roasted and kept for 3 hours (160min, 190min, 200min were selected for the holding time between 160-200min, and the best effect was 3h) , to obtain 13.21g of hydromagnesite light-burned magnesium oxide powder, and the loss on ignition rate was 55.96%. The lightly burned magnesia powder after hydromagnesite roasting is placed in a 60-mesh (0.25mm) sieve, or a 65-mesh sieve, and sieved with absolute ethanol as a wet sieving medium. After the sieving is completed, the product on the sieve is dried, weighed, and sampled for testing. Finally, 9.36g of light-burned magnesia product was obtained, with a yield of 70.78%, and the purif...

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PUM

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Abstract

The invention relates to a thermal separation process of low-grade hydromagnesite ore. 1) using low-grade hydromagnesite with a particle size of -2mm as a raw material, the hydromagnesite is roasted at a temperature of 850-950°C, And keep warm for 160-200min to make the hydromagnesite basically decompose; 2) put the hydromagnesite roasted product into a 60-mesh or 65-mesh sieve, carry out wet sieving with the liquid fuel without water as the medium, and roast Useful minerals with different particle sizes and impurity minerals are separated to remove SiO 2 , CaO, Al 2 o 3 , Fe 2 o 3 Impurities, improve the purity of hydromagnesite light-burned magnesia. The advantages are: in the thermal separation process of low-grade hydromagnesite ore, anhydrous ethanol is used as the medium of wet screening, the MgO content of the obtained light-burned magnesia is more than 97%, and the thermal separation concentrate yield is more than 70%.

Description

technical field [0001] The invention relates to a thermal separation process of low-grade hydromagnesite ore. Background technique [0002] my country's hydromagnesite resources are rich in reserves, but low-grade hydromagnesite accounts for a large proportion, and low-grade hydromagnesite resources are abundant. Generally, the useful minerals in hydromagnesite are hydromagnesite, and the gangue minerals include quartz, Aragonite etc. In industrial production, low-grade hydromagnesite cannot be used directly, and must be purified through mineral processing. The useful component in hydromagnesite is MgO, and the impurity component is SiO 2 , CaO, Fe 2 o 3 、Al 2 o 3 . SiO 2 and Fe 2 o 3 It is a harmful impurity in hydromagnesite, and its content has a direct impact on product quality; when the MgO content meets the requirements, the CaO content is high, which is conducive to the formation of dicalcium sand (CaO / SiO 2 ≥2). Therefore, the purpose of beneficiation and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B5/44B03B7/00
CPCB03B5/44B03B7/00
Inventor 代淑娟苏馨李鹏程郗悦李晓安韩佳宏孙文瀚余鑫
Owner UNIV OF SCI & TECH LIAONING
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