Apparatus and method for pipeline continuous carbonization of calcium and magnesium

A technology of calcium magnesium carbide and tubular reaction device, which is applied in the direction of magnesium carbonate, calcium carbonate/strontium/barium, etc., can solve the problems of low mechanical efficiency, limited improvement of carbonization efficiency, and high energy consumption, and achieve high carbonization efficiency and contact surface Enhanced, less mixed flow effect

Active Publication Date: 2015-02-11
LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This tubular reactor utilizes the form of Venturi to achieve strong stirring. This method is very suitable for the carbonization process of producing ultra-fine calcium carbonate particles, but the mechanical efficiency is low, the pressure drop is large, and the energy consumption is high. The effect needs to be improved to a limited ext

Method used

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  • Apparatus and method for pipeline continuous carbonization of calcium and magnesium
  • Apparatus and method for pipeline continuous carbonization of calcium and magnesium
  • Apparatus and method for pipeline continuous carbonization of calcium and magnesium

Examples

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Effect test

Embodiment 1

[0060] Adopt pipeline continuous carbonization device of the present invention to carry out the carbonization of calcium hydroxide, the calcium hydroxide concentration of slurry is 2g / L (calculated as oxide), adopt diaphragm pump to transport slurry, slurry flow rate is 20L / min; Carbon dioxide concentration is 99% , the carbon dioxide flow rate is 0.67L / min, the carbonization temperature is 10°C, the carbonization time is 15 minutes, and the carbonization process pressure is 40 kg. The utilization rate of carbon dioxide in the carbonization process is 99.00%, and the conversion rate of calcium in the slurry into soluble calcium bicarbonate is 98%.

Embodiment 2

[0062] The carbonization of magnesium hydroxide and calcium hydroxide slurry is carried out by pipeline continuous carbonization device, and the mixture slurry of calcium hydroxide and magnesium hydroxide obtained by digesting dolomite is used as raw material, and the concentration of magnesium hydroxide obtained is 12g / L (calculated as oxide) , the concentration of calcium hydroxide is 2g / L (calculated as oxide), the slurry is transported by a diaphragm pump, the flow rate of the slurry is 20L / min, the concentration of carbon dioxide is 99%, the flow rate of carbon dioxide is 36.83L / min, and the carbonization temperature is 15°C. The time is 15 minutes, and the carbonization process pressure is 8 kg. The utilization rate of carbon dioxide in the carbonization process is 97.00%, and the conversion rate of magnesium / calcium in the slurry into soluble bicarbonate is 98%.

Embodiment 3

[0064] The magnesium hydroxide and calcium hydroxide slurry carbonization is carried out using a pipeline continuous carbonization device. The concentration of magnesium hydroxide in the slurry is 12g / L (calculated as oxides), and the concentration of calcium hydroxide is 2g / L (calculated as oxides). The pump transports the slurry, the slurry flow rate is 20L / min, the carbon dioxide concentration is 99%, the carbon dioxide flow rate is 40.39L / min, the carbonization temperature is 20°C, the carbonization time is 45 minutes, and the carbonization process pressure is 8 kg. The utilization rate of carbon dioxide in the carbonization process is 90.00%, and the conversion rate of magnesium / calcium into soluble bicarbonate in the slurry is 98%.

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Abstract

The invention relates to an apparatus and a method for pipeline continuous carbonization of calcium and magnesium. The apparatus comprises a tubular reactor. The tubular reactor comprises an inner cavity and a heat-insulation layer; a fold fin or a spiral unit is arranged in the inner cavity of the tubular reactor; a slurry and carbon dioxide inlet is arranged at the front end of the tubular reactor. The method comprises the following steps: stirring and uniformly beating to-be-carbonized slurry containing at least one solid selected from the group consisting of calcium oxide, calcium hydrate, magnesium oxide and magnesium hydroxide, wherein the concentration of the slurry is 2 to 30 g/L in terms of an oxide, pumping the slurry and carbon dioxide into the tubular reactor and allowing the slurry and carbon dioxide to converge and contact; retaining the slurry in a pipeline for 10 to 60 min; and discharging the slurry having undergone carbonization out from a rear end of the tubular reactor and carrying out solid-liquid separation to obtain at least one selected from the group consisting of a magnesium bicarbonate solution, a calcium bicarbonate solution and calcium carbonate. According to the invention, increase of a contact surface between gas and the slurry is realized under the action of local high-speed turbulent flow of fluid in the pipeline, the amount of mixed flows in a whole system is small, and integral carbonization efficiency is high.

Description

technical field [0001] The invention relates to a device and method for continuous carbonization of calcium and magnesium in pipelines, in particular to a device and method for continuous carbonization of magnesium hydroxide / calcium hydroxide slurry in pipelines, in which the continuous carbonization of pipelines with flaps or spirals is used instead of the commonly used carbonization tower Realize the carbonization of magnesium / calcium oxide or hydroxide slurry to obtain magnesium bicarbonate / calcium bicarbonate solution, so as to improve the carbonization efficiency and the utilization rate of carbon dioxide, and reduce the greenhouse effect. Background technique [0002] At present, when calcium-magnesium-containing minerals are used as raw materials at home and abroad, when calcium-magnesium carbonate products are produced by carbonization, the carbonization process actually contains Mg(OH) 2 or Ca(OH) 2 , Mg(OH) 2 and Ca(OH) 2 Mixed alkaline slurry with CO dissolved ...

Claims

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Application Information

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IPC IPC(8): C01F11/18C01F5/24
Inventor 龙志奇冯宗玉崔大立黄小卫王猛王良士张娜于瀛
Owner LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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