Method and device for preparing basic magnesium carbonate from heavy magnesium carbonate water by pyrolysis

A technology of magnesium carbonate and heavy magnesium water, which is applied in the direction of magnesium carbonate, can solve the problems of low heat energy utilization rate, short operation cycle, and high heat loss, and achieve high heat energy utilization rate, obvious energy saving effect, and low fuel consumption.

Active Publication Date: 2012-09-12
丁丽芳 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Disadvantages of the first type of method: 1) The utilization rate of heat energy is low, and a boiler needs to be specially set up for pyrolysis, and the steam generated by the boiler is used to heat the heavy magnesium water, or the boiler is used to directly heat the heavy magnesium water. In this method, the fuel burns at 600 The heat energy in the high temperature area above ℃ and the heat radiation area is not effectively utilized, and the heat exchange process between steam and heavy magnesium water is more heat loss and more fuel consumption
2) The basic magnesium carbonate precipitate generated in the pyrolysis process of heavy magnesium water is precipitated from the water in the form of crystallization, and the supersaturation of basic magnesium carbonate crystals produced by the

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  • Method and device for preparing basic magnesium carbonate from heavy magnesium carbonate water by pyrolysis
  • Method and device for preparing basic magnesium carbonate from heavy magnesium carbonate water by pyrolysis
  • Method and device for preparing basic magnesium carbonate from heavy magnesium carbonate water by pyrolysis

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Effect test

Embodiment 1

[0034] A kind of pyrolysis heavy magnesium water produces the method (as figure 1 shown), which includes the following steps:

[0035] The temperature is 20°C, the mass concentration is 100g / L magnesium bicarbonate aqueous solution and the temperature is 40°C saturated basic magnesium carbonate solution, the volume ratio is 1:29 (the flow rate of magnesium bicarbonate aqueous solution is 2m 3 / h, the flow rate of saturated basic magnesium carbonate solution is 58m 3 / h) After mixing, enter the pyrolyzer with a temperature of 40°C for heat exchange, and the residence time is 240min. Liquid separation, solid-liquid separation to obtain solid basic magnesium carbonate crystals, solid basic magnesium carbonate crystals were dried at 180°C for 3 hours (110.6kg / h); the saturated basic magnesium carbonate solution at a temperature of 40°C came from centrifugal sedimentation The resulting light phase.

[0036] Realize described pyrolysis heavy magnesium water to produce the device ...

Embodiment 2

[0039] A method for pyrolyzing heavy magnesium water to produce basic magnesium carbonate, comprising the steps of:

[0040] The temperature is 30°C, the mass concentration is 12g / L magnesium bicarbonate aqueous solution and the temperature is 90°C saturated basic magnesium carbonate solution at a volume ratio of 1:2 (the flow rate of magnesium bicarbonate aqueous solution is 20m 3 / h, the flow rate of saturated basic magnesium carbonate solution is 40m 3 / h) After mixing, enter the pyrolyzer with a temperature of 90°C for heat exchange, and the residence time is 10min. After the heat exchange, the reaction liquid is separated from solid and liquid to obtain solid basic magnesium carbonate crystals and filtrate, and part of the filtrate is refluxed with bicarbonate The magnesium aqueous solution is mixed, and the other part is sent to the post-treatment process. The obtained solid basic magnesium carbonate crystals are dried at 200°C for 2.5 hours (132.7kg / h). That is to say,...

Embodiment 3

[0044] A method for pyrolyzing heavy magnesium water to produce basic magnesium carbonate, comprising the steps of:

[0045] The temperature is 60°C, the mass concentration is 20g / L magnesium bicarbonate aqueous solution and the temperature is 70°C and the saturated basic magnesium carbonate solution containing a small amount of solid crystals has a volume ratio of 1:0.05 (the flow rate of the magnesium bicarbonate aqueous solution is 10m 3 / h, the flow rate of saturated basic magnesium carbonate solution is 0.5m 3 / h) After mixing, enter the pyrolyzer with a temperature of 70°C to exchange heat, and the residence time is 40min. After the heat exchange, part of the reaction liquid is refluxed and mixed with an aqueous solution of magnesium bicarbonate, and the other part is separated into solid and liquid to obtain solid basic carbonic acid Magnesium crystals, solid basic magnesium carbonate crystals are obtained by drying at 220°C for 2 hours (110.6kg / h). That is to say, the...

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Abstract

The invention relates to a method for preparing basic magnesium carbonate from heavy magnesium carbonate water by pyrolysis, which comprises the following steps: mixing a magnesium bicarbonate water solution, of which the temperature is 20-60 DEG C and the mass concentration is 3.5-100g/L, and a saturated basic magnesium carbonate or saturated basic magnesium carbonate solution containing small amount of solid crystals, of which the temperature is 40-90 DEG C, in a volume ratio of 1:(0.05-29); carrying out heat exchange in a 40-90 DEG C pyrolyzer for 10-240 minutes; carrying out solid-liquid separation on the reaction liquid to obtain solid basic magnesium carbonate crystals and a filtrate; and drying the solid basic magnesium carbonate crystals to obtain the heavy magnesium carbonate. The method provided by the invention can overcome the defects of high fuel consumption, high power consumption, high scaling tendency of the pyrolyzer or boiler, short operating cycle, incapability of long-cycle smooth operation, and the like in the existing methods.

Description

technical field [0001] The invention belongs to the technical field of magnesium carbonate production, and in particular relates to a method for preparing basic magnesium carbonate by pyrolyzing heavy magnesium water. Background technique [0002] Heavy magnesium water is the aqueous solution of magnesium bicarbonate. The solubility of magnesium bicarbonate in water is: 120g / (100g water) at 20°C, 80g / (100g water) at 40°C, and 20g / (100g water) at 80°C. The data is based on MgO saturated CO 2 Solubility meter in water. Magnesium bicarbonate is an unstable weak acid salt. When magnesium bicarbonate is heated in water, it undergoes a decomposition reaction, that is, pyrolysis. The reaction process absorbs heat. The main reaction formula is as follows: [0003] 5Mg(HCO 3 ) 2 + nH 2 O = 4MgCO 3 ·Mg(OH) 2 4H 2 O↓+6CO 2 ↑ + nH 2 O-Q [0004] It can be seen from the reaction formula that rising temperature and reducing the partial pressure of carbon dioxide inside and on...

Claims

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Application Information

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IPC IPC(8): C01F5/24
Inventor 丁丽芳
Owner 丁丽芳
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