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Technology for producing active magnesium oxide

A technology of active magnesium oxide and production process, applied in magnesium oxide and other directions, can solve the problem of high energy consumption of light magnesium carbonate, achieve obvious energy saving effect, reduce energy consumption and cost, and reduce thermal energy consumption.

Inactive Publication Date: 2010-06-23
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the light magnesium carbonate filter cake obtained after heavy magnesium hydrolysis, filtration and separation has a relatively high water content, generally about 75%, that is, for every ton of light magnesium carbonate produced, about 3 tons of water need to be dried and evaporated. The amount is very large, resulting in high energy consumption in the drying process of light magnesium carbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The prepyrolyzer adopts a tower reactor with an effective volume of 15L. The flow of heavy magnesium water from the carbonization process is 11.8kg / h, the concentration of heavy magnesium water is 8.5g / L in terms of magnesium oxide, and the temperature is 24.0℃, sprayed from the top of the pre-pyrolyzer; the heavy magnesium that has passed through the pre-pyrolyzer The water is put into the pyrolyzer, and saturated steam is passed into it for heating, so that the temperature of the heavy magnesium water is increased to 97.5℃, and the magnesium bicarbonate in the heavy magnesium water is fully decomposed into light magnesium carbonate and precipitated. The resulting suspension is filtered The light magnesium carbonate filter cake with 76.5% water content is separated; the light magnesium carbonate filter cake is sent to a dryer for drying to obtain a light magnesium carbonate product of 224.4g / h; the dried light magnesium carbonate product is sent to the calciner, Calcine...

Embodiment 2

[0035] A bubbling reactor was used as a pre-pyrolyzer to conduct batch operation experiments. The effective volume of the bubble reactor is 10L, and the ratio of height to diameter is 5:1. Take 10.0L heavy magnesium water and place it in a bubbling reactor. The heavy magnesium water has a concentration of 7.9g / L based on magnesium oxide and a temperature of 18.9°C. Saturated steam is introduced into the bubbling reactor for heating to increase the temperature to 62.8°C, and then vacuum equipment is used to continuously evacuate the bubbling reactor to keep the absolute pressure inside the bubbling reactor at 21.00 kPa for 20-40 minutes. The magnesium bicarbonate in the heavy magnesium water is fully decomposed into light magnesium carbonate and precipitated out. The resulting suspension is separated by filtration to obtain a light magnesium carbonate filter cake with water content of 77.8%; the light magnesium carbonate filter cake is sent to a dryer for drying to obtain a ligh...

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Abstract

The invention relates to a technology for producing active magnesium oxide, comprising the following steps: adding a pre-pyrolysis device on the basis of the technology for producing active magnesium oxide by the traditional carbonization process; introducing dry tail gas obtained by drying light magnesium carbonate to the pre-pyrolysis device, carrying out direct heat exchange with heavy magnesium water, recovering heat in the tail gas, raising temperature of the heavy magnesium water from 10-30 DEG C to 40-55 DEG C and conveying heated heavy magnesium water to the pre-pyrolysis device for complete pyrolysis.In the invention, heat in the dry tail gas is recovered, temperature of heavy magnesium water is raised, primary energy consumption of unit product is lowered, magnesium carbonate dust carried in the dry tail gas is recovered, so that environmental pollution is reduced and multiple purposes are achieved.In addition, the economic and environmental benefits of the technology are remarkable.

Description

Technical field [0001] The invention belongs to the technical field of energy saving in chemical processes. It relates to an active magnesium oxide production process that uses magnesium-containing non-metallic minerals as raw materials and adopts a carbonization method to produce active magnesium oxide. Low-level heat energy is recycled and utilized to reduce energy consumption. Background technique [0002] Activated magnesium oxide is mainly used as an accelerator for chloroprene rubber and fluororubber, and is used as fillers for adhesives, sealing materials, plastics, paints, and paper; used in medicine as an antacid and laxative, and used for hyperacidity and tenacity. Diodenal ulcer; it can also be used as a raw material for ceramics, glass, high-grade thermal insulation material, magnesium oxide cement, etc. Activated magnesium oxide is widely used and the market demand is increasing day by day. [0003] At present, the raw materials for the production of active magnesia ...

Claims

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Application Information

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IPC IPC(8): C01F5/06
Inventor 胡永其胡晓波刘宝树宋丽英刘润静胡庆福卢赤杰
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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