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Method for preparing alkaline type magnesium carbonate by low temperature pyrogenation of Mg(HCO3)2 water and coproducing magnesium silicate

A low-temperature pyrolysis and magnesium carbonate technology, applied in the direction of magnesium silicate, magnesium carbonate, silicate, etc., can solve the problems of high energy consumption, large waste, poor management, etc., achieve low pyrolysis temperature, high decomposition rate, The effect of high yield

Inactive Publication Date: 2007-05-30
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the continuous rise of energy costs at home and abroad in recent years, energy is an important material basis for the development of the world economy. Although my country's energy resources are abundant, the per capita share is very low, coupled with poor management, backward technology, high energy consumption, The waste is so large that the energy supply in our country tends to be in short supply, which leads to an increase in production costs.

Method used

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  • Method for preparing alkaline type magnesium carbonate by low temperature pyrogenation of Mg(HCO3)2 water and coproducing magnesium silicate
  • Method for preparing alkaline type magnesium carbonate by low temperature pyrogenation of Mg(HCO3)2 water and coproducing magnesium silicate
  • Method for preparing alkaline type magnesium carbonate by low temperature pyrogenation of Mg(HCO3)2 water and coproducing magnesium silicate

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Embodiment 1

[0042] The experimental process of the present invention is shown in Figure 2. A bubbling reactor is used, the air volume is 10L / h, and it is fixed, the amount of heavy magnesium aqueous solution is 1500ml, and the gas-liquid ratio is 6.67. Experiments at 40°C and 60°C The results are shown in Figure 3 and Figure 4.

[0043] Fig. 3 is when temperature is 60 ℃, and gas-to-liquid ratio is 6.67 when the content of bicarbonate of magnesium in heavy magnesium water is the relationship diagram of time change, can find out that the decomposition rate of bicarbonate of magnesium is 85%.

[0044] Fig. 4 is when the pyrolysis temperature is 40 DEG C, the magnesium bicarbonate content changes with time in the solution graph, the decomposition rate of magnesium bicarbonate is 83.08%, and the variation with time of the two tends to be gentle after 200 minutes.

Embodiment 2

[0046]The selected air volume is 40L / h, and it is fixed, the amount of heavy magnesium aqueous solution is 1500ml, and when the gas-liquid ratio is 26.68, the experimental results of pyrolysis temperature of 40°C and time of 120 minutes are shown in Figure 5. Magnesium bicarbonate The decomposition rate is 87.1%.

Embodiment 3

[0048] Under the condition of temperature 30°C, the concentration of heavy magnesium water is 25L containing magnesium bicarbonate (29.6g / l), pumped into the spray desorption tower by centrifugal pump, the flow rate is 100L / h, and the gas flow rate is 6L / h. The results are shown in As shown in Figure 6, it can be seen that when the time is 40 minutes, the mass transfer rate is accelerated due to the liquid droplets being dispersed into the air in the form of mist droplets, the carbon dioxide desorption rate is accelerated, and the decomposition rate of light magnesium carbonate reaches 81%. .

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Abstract

The invention discloses a recycling method of magnesium in the heavy magnesium water solution, which comprises the following steps: aerating air in the heat decomposing reactor bottom under indoor temperature; reducing partial pressure of carbon dioxide through extracting into vacuum; transmitting 80-90% magnesium bicarbonate in the heavy magnesium solution into the sediment of basic magnesium carbonate sediment; filtering; drying to obtain the basic magnesium carbonate; adding sodium silicate in the filtrate; reacting residual 10-20% magnesium bicarbonate and sodium silicate to obtain magnesium silicate; recycling magnesium in the heavy magnesium solution completely.

Description

technical field [0001] The invention relates to a method for recovering magnesium in heavy magnesium aqueous solution, in particular to a method for preparing basic magnesium carbonate and co-producing magnesium silicate by pyrolyzing heavy magnesium water at low temperature. Background technique [0002] As an important inorganic chemical product, light magnesium carbonate (also known as basic magnesium carbonate) can be used as a raw material for preparing high-purity magnesia and magnesium salt series products, as well as rubber, medicine, insulating materials, dental preparations, Additives and modifiers of high-grade glass, food and pharmaceutical grade various chemical products have broad application prospects. Therefore, the research on the preparation of their products has attracted more and more attention. In my country, dolomite, magnesite, brucite, hydromagnesite and other magnesium-containing non-metallic ores are used as raw materials to produce light magnesium ...

Claims

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Application Information

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IPC IPC(8): C01F5/24C01B33/22
Inventor 刘润静胡永琪胡庆福刘洪杰
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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