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Method for preparing light calcium carbonate and magnesium oxide from dolomite

A light calcium carbonate, dolomite technology, applied in the directions of magnesium oxide, calcium carbonate/strontium/barium, etc., can solve the problems of reducing the operability of workers, reducing the added value of products, reducing factory income, etc., and achieving good industrial application prospects , easy to control, avoid the effect of secondary pollution

Active Publication Date: 2014-09-03
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ammonia is distilled in the digestion section, and ammonia is highly volatile, causing environmental pollution and reducing the operability of workers.
[0013] In summary, the production of light magnesium carbonate or magnesium oxide by the dolomite carbonization method has disadvantages such as high energy consumption, the need for secondary strong acid leaching, complex processes, etc., especially the product purity is not high, so it is produced by the dolomite carbonization method The magnesium carbonate contains calcium, and the calcium carbonate contains magnesium and other impurities.
As a result, the purity of the magnesium product is low, and the added value of the product is reduced; the calcium carbonate produced by the dolomite carbonization method cannot be used effectively because it contains a large amount of impurities, which reduces the profit of the factory

Method used

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  • Method for preparing light calcium carbonate and magnesium oxide from dolomite
  • Method for preparing light calcium carbonate and magnesium oxide from dolomite
  • Method for preparing light calcium carbonate and magnesium oxide from dolomite

Examples

Experimental program
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Embodiment 1

[0053] The method for preparing light calcium carbonate and magnesium oxide by dolomite in the present embodiment is to operate as follows:

[0054] a. Crushing the dolomite raw ore to a particle size of 0.5-5mm, placing it in a muffle furnace and calcining at 950°C for 1.5h to obtain dolomite lime powder, which is sealed and stored;

[0055] b. Place the dolomite lime powder obtained in step a into water at 80°C for digestion, the liquid-solid ratio is 20mL:1g, stir and react at a constant temperature for 30min, and the rotating speed is 400r / min, cool after the reaction, and age for 24h to obtain the digestate;

[0056] c. Add sodium gluconate solution to the digestive juice obtained in step b, the molar ratio of sodium gluconate to calcium in the digestive juice is 1:1, stir and react at a constant temperature at 25°C for 0.7 hours, and the speed is 400r / min; the reaction is over Afterwards, soluble calcium ion solution and filter cake are obtained by filtration and separat...

Embodiment 2

[0064] The method for preparing light calcium carbonate and magnesium oxide by dolomite in the present embodiment is to operate as follows:

[0065] a. Crushing the dolomite raw ore to a particle size of 0.5-5mm, placing it in a muffle furnace and calcining at 950°C for 1.5h to obtain dolomite lime powder, which is sealed and stored;

[0066] b. Place the dolomite lime powder obtained in step a in water at 85°C for digestion, the liquid-solid ratio is 20mL:1g, stir and react at a constant temperature for 40min, and the rotating speed is 400r / min, cool after the reaction, and age for 24h to obtain the digestive juice;

[0067] c. Add sucrose solution to the digestive solution obtained in step b. The molar ratio of sucrose to calcium in the digestive solution is 1.5:1. Stir and react at a constant temperature of 30°C for 0.8 hours at a speed of 500r / min; Soluble calcium ion solution and filter cake are obtained by filtering and separating;

[0068] d. Stir and heat the soluble ...

Embodiment 3

[0074] The method for preparing light calcium carbonate and magnesium oxide by dolomite in the present embodiment is to operate as follows:

[0075] a. Crushing the dolomite raw ore to a particle size of 0.5-5mm, placing it in a muffle furnace and calcining at 950°C for 1.5h to obtain dolomite lime powder, which is sealed and stored;

[0076] b. Place the dolomite lime powder obtained in step a in water at 90°C for digestion, the liquid-solid ratio is 20mL:1g, stir and react at a constant temperature for 60min, and the rotating speed is 400r / min, cool after the reaction, and age for 24h to obtain the digestive juice;

[0077] c. Add the sodium citrate solution to the digestive solution obtained in step b, the molar ratio of sodium citrate to calcium in the digestive solution is 4:1, stir and react at a constant temperature of 35°C for 1 hour, and the rotation speed is 300r / min; the reaction ends Afterwards, soluble calcium ion solution and filter cake are obtained by filtratio...

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Abstract

The invention discloses a method for preparing light calcium carbonate and magnesium oxide from dolomite. The method comprises the following steps: firstly, calcining and slaking the dolomite to obtain a slaking liquid, converting calcium hydroxide in the slaking liquid to a soluble calcium ion solution through a phase-transfer reaction, meanwhile filtering out magnesium hydrate filter cakes containing impurities, feeding CO2 into the soluble calcium ion solution, precipitating and separating to obtain calcium carbonate and a filter liquor, pulping and carbonizing the magnesium hydrate filter cakes containing impurities to obtain a magnesium bicarbonate solution, then performing a pyrolytic reaction to obtain basic magnesium carbonate, and calcining to obtain light magnesium oxide. The method is simple in technical process and low in energy consumption without strong acid to leach and addition of an impurity removing precipitator, the calcium and magnesium separation effect is good, a common carbonization liquid-solid-gas three-phase reaction is avoided, the reaction condition is easily controlled, and prepared light calcium carbonate accords with demands of national corresponding product standard and lays research basis for industrial scale production.

Description

1. Technical field [0001] The invention relates to the comprehensive utilization of dolomite raw ore, in particular to a method for preparing light calcium carbonate and magnesium oxide from dolomite. 2. Background technology [0002] Dolomite is a compound of calcium and magnesium carbonates, the main components are MgO, CaO, SiO 2 , Fe 2 o 3 , the average content is 21.29%, 30.42%, 0.78%, 0.13%, respectively, and the maximum theoretical content of magnesium oxide in dolomite is 21.4%. Dolomite crystal is a carbonate mineral of trigonal crystal system, rhombohedral; generally white, off-white, relative density 2.8-2.9, Mohs hardness 3.4-4, with glass luster; insoluble in water, reacts slowly with dilute acid, Foams slowly only in powder or heated state. [0003] With the rapid development of my country's economy, the development of my country's mineral resources is increasing, and the market's demand for high-quality magnesium compounds will increase year by year. Howev...

Claims

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Application Information

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IPC IPC(8): C01F11/18C01F5/02
Inventor 杨保俊张胜男王百年刘磊
Owner HEFEI UNIV OF TECH
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