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Method for preparing loose low-oil absorption magnesium-calcium powder

A technology of oil absorption and magnesium calcium, applied in the direction of magnesium carbonate, calcium carbonate/strontium/barium, etc., can solve the problems of affecting application, poor dispersion and compatibility, etc., achieve high social and economic benefits, and invest in less equipment , The effect of short process flow

Active Publication Date: 2014-08-13
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ordinary magnesium-calcium powder particles are easy to agglomerate and have poor dispersion and compatibility in polymer materials, which affects its application as an additive in the polymer material industry

Method used

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  • Method for preparing loose low-oil absorption magnesium-calcium powder
  • Method for preparing loose low-oil absorption magnesium-calcium powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 490kg of magnesium-calcium wet slag with a moisture content of 59.4% after detoxification and add it to the mixing tank, add 1500L of water, and pump it into 5m after fully stirring to form a uniform suspension slurry. 3 Reactor, add stearic acid 5kg, sodium stearate 4kg, glycerin 1kg, add stearic acid 5kg, sodium stearate 5kg again when heating up to 85 ℃, cool after reacting for 2 hours. The cooled slurry is then dehydrated and dried to obtain the final product loose magnesium calcium powder with low oil absorption. Take a part of the original magnesium-calcium powder to measure its particle size distribution and oil absorption. A part of the processed loose low oil absorption magnesium calcium powder sample was taken to measure its activation rate, particle size distribution and oil absorption. The activation rate of the loose type low oil absorption magnesium calcium powder is determined to be 99.5%. Particle size D before treatment 50 8.94μm, the particle s...

Embodiment 2

[0022] Take 480kg of magnesium-calcium wet slag with a moisture content of 52% after detoxification and add it to the mixing tank, add 1360L of water, and pump it into 5m after fully stirring to form a uniform suspension slurry. 3 Reactor, add stearic acid 5.5kg, sodium stearate 1.5kg, glycerol 1kg, add stearic acid 6.5kg, sodium stearate 2.0kg when heating up to 80 ℃, cool after reacting for 1.5 hours. The cooled slurry is then dehydrated and dried to obtain the final product loose magnesium calcium powder with low oil absorption. Take a part of the original magnesium-calcium powder to measure its particle size distribution and oil absorption. A part of loose low oil absorption magnesium calcium powder sample was taken to measure its activation rate, particle size distribution and oil absorption. The activation rate of the loose type low oil absorption magnesium calcium powder is determined to be 99.8%. Particle size D before treatment 50 9.67μm, the particle size D after ...

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Abstract

The invention belongs to the field of inorganic materials, and in particular relates to a method for preparing loose low-oil absorption magnesium-calcium powder. The method is characterized by comprising the following steps: (1) preparing slurry of which the solid-to-liquid ratio is 1:4 to 1:20 from magnesium-calcium wet slag; (2) stirring and emulsifying the slurry obtained in step (1), then adding a treatment agent in batch at 20-95 DEG C, and treating for 0.5-24h; (3) filtering the slurry treated in step (2) to obtain filter residue and filtrate, and drying the filter residue to obtain a finished product of the loose low oil absorption magnesium-calcium powder; meanwhile, adding water and a treatment agent into the filtrate for later use, wherein the preparation method for the magnesium-calcium wet slag comprises the steps of adding a mineralizing agent into the waste slag containing hexavalent chromium, heating the mixture to 30-250 DEG C to generate settleable waste slag, separating the waste slag out, and washing to obtain the magnesium-calcium wet slag. The method has the advantages that the process flow is short, the input equipment is less, the production conditions are easy to control, and the obtained loose low-oil absorption magnesium-calcium powder can be widely applied to various industrial production processes and has relatively high social and economic benefits.

Description

technical field [0001] The invention belongs to the field of inorganic materials, in particular to a method for preparing loose magnesium-calcium powder with low oil absorption. Background technique [0002] Chinese patent CN101209873A introduces a chromium separation and recovery treatment method for waste residue containing hexavalent chromium for chromium-containing industrial waste residue produced in chlor-alkali, chlorate and other industrial fields. In this method, a mineralizing agent is added, and after hydrothermal treatment, washing, dehydration and drying are performed to obtain white calcium-containing magnesium powder. Although this powder will not cause harm to the environment, if these powders are landfilled, it will not only waste resources, but also consume a lot of manpower, material resources and financial resources. If it is possible to turn magnesium-containing calcium powder into treasure and realize resource reuse, it will not only save a lot of reso...

Claims

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Application Information

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IPC IPC(8): C01F5/24C01F11/18
Inventor 吴智诚林璋陈志董建平洪杨平
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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