Comprehensive utilization method for low-grade magnesite

A magnesite and low-grade technology, which is applied in the field of comprehensive utilization of low-grade magnesite, can solve the problem of separation of useful components without magnesite, and achieve the effect of improving comprehensive utilization rate and full utilization.

Inactive Publication Date: 2011-07-06
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the invention patent separates and purifies magnesite, the final product is still a multi

Method used

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  • Comprehensive utilization method for low-grade magnesite

Examples

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Example Embodiment

[0039] Example 1

[0040] The concentration of hydrochloric acid used in this embodiment is 0.2 mol / L, and the concentration of NaOH solution used is 0.1 mol / L.

[0041] Calcining low-grade magnesite in a muffle furnace at 900 °C for 3 h, the obtained CO 2 Gas recovery, the obtained light-burned magnesia is ground into -200 mesh light-burned magnesia powder; the light-burned magnesia powder is mixed with water and stirred evenly, and the mixing ratio is light-burned magnesia powder by weight: water=1: 4. Then add hydrochloric acid to adjust the pH of the mixture to 5 to obtain a slurry, filter the slurry to obtain a primary filter cake and a primary filtrate; add NaOH solution to the primary filtrate and stir evenly, the pH of the primary filtrate = 5, and then under stirring conditions Filtrate to obtain the secondary filter cake and secondary filtrate, and dry the secondary filter cake at 150°C to obtain Al 2 o 3 product; add NaOH solution to the secondary filtrate and st...

Example Embodiment

[0045] Example 2

[0046] The concentration of hydrochloric acid used in this embodiment is 0.3 mol / L, and the concentration of NaOH solution used is 0.4 mol / L.

[0047] Calcining low-grade magnesite in a muffle furnace at 950 °C for 2.5 h, the 2 Gas recovery, the obtained light-burned magnesia is ground into -100 mesh light-burned magnesia powder; the light-burned magnesia powder is mixed with water and stirred evenly, and the mixing ratio is light-burned magnesia powder by weight: water=1: 2. Then add hydrochloric acid to adjust the pH=4 of the mixture to obtain a slurry, filter the slurry to obtain a primary filter cake and a primary filtrate; add NaOH solution to the primary filtrate and stir evenly, the pH of the primary filtrate=4, and then under stirring conditions Filtrate to obtain the secondary filter cake and secondary filtrate, and dry the secondary filter cake at 140°C to obtain Al 2 o 3 product; add NaOH solution to the secondary filtrate and stir evenly, whil...

Example Embodiment

[0050] Example 3

[0051] The hydrochloric acid concentration that adopts is 0.5mol / L, and the NaOH solution concentration that adopts is 0.2mol / L;

[0052] Calcining low-grade magnesite in a muffle furnace at 1000 °C for 2 h, the CO 2 Gas recovery, the obtained light-burned magnesia is ground into -300 mesh light-burned magnesia powder; the light-burned magnesia powder is mixed with water and stirred evenly, and the mixing ratio is light-burned magnesia powder by weight: water=1: 1, then add hydrochloric acid to adjust the pH=5 of the mixture to obtain a slurry, filter the slurry to obtain a primary filter cake and a primary filtrate; add NaOH solution to the primary filtrate and stir evenly, the pH of the primary filtrate=6, and then under stirring conditions Filtrate to obtain the secondary filter cake and secondary filtrate, and dry the secondary filter cake at 160°C to obtain Al 2 o 3 product; add NaOH solution to the secondary filtrate and stir evenly, while feeding C...

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Abstract

The invention relates to a comprehensive utilization method for low-grade magnesite, and belongs to the fields of mineral processing and environmental protection. The method comprises the following steps of: grinding MgO obtained by calcining the low-grade magnesite into powder, mixing with H2O, and filtering to obtain a primary filter cake and primary filtrate; adding alkali solution into the primary filtrate, and filtering to obtain a filter cake and filtrate; drying the filter cake to obtain Al2O3; adding NaOH solution into the filtrate and introducing CO2 gas to obtain a filter cake and filtrate; drying the filter cake to obtain CaCO3; heating and filtering the filtrate to obtain a filter cake and filtrate NaCl; calcining the filter cake to obtain the MgO; adding acid into the primary filter cake, filtering to obtain a filter cake and filtrate, and drying the filter cake to obtain SiO2; and adding the NaOH into the filtrate, filtering to obtain a filter cake and sexenary filtrate NaCl, and calcining the filter cake to obtain Fe2O3. Useful components in the magnesite are extracted and separated one by one, so that the zero emission of magnesite tailings is realized, the low-grade magnesite is more fully utilized, and the comprehensive utilization rate of mineral resources is improved.

Description

technical field [0001] The invention relates to a comprehensive utilization method of low-grade magnesite, which belongs to the fields of mineral processing and environmental protection. Background technique [0002] my country's magnesite resources are abundant and of good quality, with a reserve of 3 billion tons, accounting for one-third of the world's reserves and ranking first. The advantages of mineral resources make my country the largest producer and exporter of magnesia materials in the world. At present, magnesite is mainly used to prepare various magnesia refractory materials and magnesium chemicals. However, extensive production and management methods have led to a sharp reduction in high-quality magnesite resources, and the chemical composition of magnesite is mainly MgCO 3 , when it contains a small amount of impurity components such as calcium oxide, aluminum oxide, iron oxide, ferrous oxide or silicon dioxide, the refractoriness will drop significantly. The...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B3/06C22B3/46C22B21/00C22B26/20C22B26/22C01B33/113C01G49/06
CPCY02P10/20
Inventor 高玉娟
Owner LIAONING TECHNICAL UNIVERSITY
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