Magnesite carbonization method for producing magnesium hydroxide and calcium carbonate product

A technology of magnesium hydroxide and magnesite, applied in the direction of magnesium hydroxide, calcium carbonate/strontium/barium, etc., can solve the problems of low carbonization efficiency, low resource utilization efficiency, and small scale, so as to improve carbonization efficiency and comprehensive Utilization rate, fully utilized effect

Inactive Publication Date: 2011-03-23
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the following main problems still exist in the process of developing and utilizing magnesium ore resources: the use of magnesium ore resources is too extensive, and the utilization efficiency of resources is seriously low; due to the small scale of most magnesium and magnesium salt industries, the low level of technology and equipment, most of them use Low value-added products with low technical content are the main products, and the advantages of mineral resources have not been fully utilized, and the development mode of exchanging survival at the cost of resources and the environm

Method used

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  • Magnesite carbonization method for producing magnesium hydroxide and calcium carbonate product

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Experimental program
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Effect test

Embodiment 1

[0029] The concentration of the NaOH solution used in this embodiment is 0.1 mol / L.

[0030] The magnesite is calcined in a muffle furnace at 900°C for 3 hours to obtain CO 2 After gas recovery, the obtained light burnt magnesia is ground into -200 mesh light burnt magnesia powder; the light burnt magnesia powder and water are mixed according to the weight ratio of light burnt magnesia powder: water=1:40 and stirred evenly, Hydrate at 80℃ for 3h to obtain a slurry; add lightly burned MgO powder:CaCl to the slurry in a weight ratio 2 =1:0.8 CaCl 2 Mix and stir evenly, the mixing ratio, and stir evenly, and at the same time pass in CO with a purity of 99% 2 Gas, reaction pressure is 0.5MPa, reaction temperature is 25℃, reaction time 2h , Then stir and filter to obtain the primary filter cake and the primary filtrate, add NaOH to the primary filtrate and stir evenly, adjust the pH of the primary filtrate to 8, then stir and filter to obtain the secondary filter cake and the secondary ...

Embodiment 2

[0034] The concentration of the NaOH solution used in this embodiment is 0.4 mol / L.

[0035] The low-grade magnesite is calcined in a muffle furnace at 950℃ for 2.5h to obtain CO 2 After gas recovery, the obtained light burned magnesia is ground into -100 mesh light burned magnesia powder; the light burned magnesia powder and water are mixed according to the weight ratio of light burned magnesia powder: water = 1:20 and stirred evenly, Hydrate at 90°C for 2.5 hours to obtain a slurry; add lightly burned MgO powder: CaCl to the slurry in a weight ratio 2 =1:0.9 Calcium chloride is mixed and stirred evenly, then CO with 99% purity by mass is introduced 2 Gas, reaction pressure is 0.3MPa, reaction temperature is 25℃, reaction time 3h , Then stir and filter to obtain the primary filter cake and the primary filtrate, add NaOH to the primary filtrate and stir evenly, adjust the pH of the primary filtrate to 9, then stir and filter to obtain the secondary filter cake and the secondary fil...

Embodiment 3

[0039] The concentration of the NaOH solution used in this embodiment is 0.2mol / L;

[0040] The magnesite is calcined in a muffle furnace at 1000°C for 2h to obtain CO 2 After gas recovery, the obtained light burned magnesia is milled into -300 mesh light burned magnesia powder; the light burned magnesia powder and water are mixed according to the weight ratio: water = 1:30 and stirred evenly, Hydrate at 100℃ for 2h to obtain a slurry; add lightly burned MgO powder:CaCl to the slurry in a weight ratio 2 =1:1.1 CaCl 2 After mixing and stirring, pass in CO with a purity of 99% 2 Gas, reaction pressure is 0.6MPa, reaction temperature is 25℃, reaction time 1.5h , Then stir and filter to obtain the primary filter cake and the primary filtrate, add NaOH to the primary filtrate and stir evenly, adjust the pH of the primary filtrate to 10, and then stir and filter to obtain the secondary filter cake and the secondary filtrate; press the secondary filter cake The weight ratio is configured...

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Abstract

The invention discloses a magnesite carbonization method for producing magnesium hydroxide and a calcium carbonate product, and belongs to the technical field of inorganic chemical industry. The method comprises the following steps of: calcining and grinding magnesite, mixing with water, adding CaCl2 into pulp, introducing CO2 gas, and stirring and filtering to obtain a primary filter cake and primary filtrate; adding alkali into the filtrate, and stirring and filtering to obtain a secondary filter cake and secondary filtrate; performing spray drying on the secondary filter cake to obtain Mg(OH)2; drying the secondary filtrate to obtain NaCl; adding water into the primary filter cake, introducing CO2 gas, and stirring and filtering to obtain a third filter cake and third filtrate; performing spray drying on the third filtrate to obtain CaCO3; and filtering and drying the third filter cake to obtain a product serving as a raw material for producing glass for subsequent treatment. The CaCl2 is added in the carbonization reaction process, the carbonization efficiency is improved, high-purity magnesium hydroxide and calcium carbonate products are prepared, other useful components serve as raw materials for producing glass and is subsequently treated and utilized, the production process flow is simple, the equipment requirement is low, and after the treatment, other pollution is not generated.

Description

technical field [0001] The invention relates to a process method for comprehensive utilization of magnesite, in particular to a method for producing magnesium hydroxide and co-producing calcium carbonate products through carbonization of magnesite. 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 unique advantages of mineral resources make my country the world's largest producer and exporter of magnesia materials. However, the following main problems still exist in the process of developing and utilizing magnesium ore resources: the use of magnesium ore resources is too extensive, and the utilization efficiency of resources is seriously low; due to the small scale of most magnesium and magnesium salt industries, the low level of technology and equipment, most of them use Low value-added products with low technical content ...

Claims

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Application Information

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IPC IPC(8): C01F5/14C01F11/18
Inventor 高玉娟
Owner LIAONING TECHNICAL UNIVERSITY
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