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A kind of light magnesium carbonate prepared by borate method and its production method and application

A light magnesium carbonate and boron mud technology, applied in magnesium carbonate and other directions, can solve the problems of inability to achieve comprehensive recovery and utilization, low waste residue reduction, low magnesium recovery rate, etc., achieve great use value and promotion value, and low equipment requirements. , to achieve the effect of ecological benefits

Active Publication Date: 2017-11-03
苏州诺济玛金属制品有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems in the prior art of low recovery rate of magnesium in forsterite, low product purity, low reduction of waste slag, inability to achieve complete comprehensive recycling, and high cost, the present invention provides a borate acidification method and carbonization method The process of preparing high-purity light magnesium carbonate, using sulfuric acid to leach magnesium, the filtrate magnesium sulfate is used to prepare high-purity light magnesium carbonate, and the precipitation phase is used to prepare amorphous white carbon black

Method used

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  • A kind of light magnesium carbonate prepared by borate method and its production method and application
  • A kind of light magnesium carbonate prepared by borate method and its production method and application

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Experimental program
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Effect test

Embodiment 1

[0056] (1) Weigh 10kg of boron mud, 15kg of sulfuric acid and 30kg of water according to the mass ratio of 1:1.5:3, mix and stir evenly, the reaction time is 1h, and the reaction temperature is 90°C.

[0057] (2) The above-mentioned acidification solution is filtered, and the filter cake is used to prepare white carbon black, and the resulting filtrate is 40L, and the 2 o 2 Add H at a volume ratio of 0.012:1 to the filtrate 2 o 2 to 0.48L, add calcium oxide to adjust the pH to 9, and filter to obtain refined magnesium solution.

[0058] (3) Add 12kg of quicklime to the refined magnesium solution according to the ratio of the mass of quicklime kg to the volume L of the magnesium solution of 0.3, the reaction temperature is 80°C, and the reaction time is 1h.

[0059] (4) Carbon dioxide gas is passed into the obtained digested slurry to carry out carbonization reaction, the carbon dioxide gas pressure is 0.4MPa, the concentration is 35%, and the carbonization time is 2h.

[0...

Embodiment 2

[0063] (1) Weigh 10kg of boron mud, 18kg of sulfuric acid and 50kg of water according to the mass ratio of 1:1.8:5, mix and stir evenly, the reaction time is 1h, and the reaction temperature is 95°C.

[0064] (2) The above-mentioned acidification solution is filtered, and the filter cake is used to prepare white carbon black, and the obtained filtrate is 41L, and the 2 o 2 Add H at a volume ratio of 0.015:1 to the filtrate 2 o 2 to 0.62L, add calcium oxide to adjust the pH to 9, and filter to obtain refined magnesium solution.

[0065] (3) Add 24.6kg of quicklime to the refined magnesium solution according to the ratio of the mass of quicklime kg to the volume L of the magnesium solution of 0.6, the reaction temperature is 90°C, and the reaction time is 2h.

[0066] (4) Carbon dioxide gas is passed into the obtained digested slurry to carry out carbonization reaction, the carbon dioxide gas pressure is 0.4MPa, the concentration is 40%, and the carbonization time is 2h.

[...

Embodiment 3

[0070] (1) Weigh 10kg of boron mud, 16kg of sulfuric acid and 40kg of water according to the mass ratio of 1:1.6:4, mix and stir evenly, the reaction time is 1h, and the reaction temperature is 95°C.

[0071] (2) The above-mentioned acidification solution is filtered, and the filter cake is used to prepare white carbon black, and the obtained filtrate is 41L, and the 2 o 2 Add H at a volume ratio of 0.013:1 to the filtrate 2 o 2 to 0.55L, add calcium oxide to adjust the pH to 9, and filter to obtain refined magnesium solution.

[0072] (3) Add 20kg of quicklime to the refined magnesium solution according to the ratio of the mass of quicklime kg to the volume L of the magnesium solution of 0.5, the reaction temperature is 90°C, and the reaction time is 1.5h.

[0073] (4) Carbon dioxide gas is passed into the obtained digested slurry to carry out carbonization reaction, the carbon dioxide gas pressure is 0.4MPa, the concentration is 38%, and the carbonization time is 2h.

[...

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Abstract

The invention provides a method for preparing light magnesium carbonate by a boric sludge acidification method. The method comprises the following steps: (1) boric sludge acidification, namely mixing boric sludge, sulfuric acid and water for acidification reaction to obtain an acidified slurry; (2) slurry filtration and impurity removal, namely filtering the obtained acidified slurry, leaching the precipitated phase with alkali and then acidifying the precipitated phase to obtain amorphous white carbon black, adjusting the pH of the filtrate and adding hydrogen peroxide to remove impurities; and (3) digestion, carbonization and pyrolytic reaction, namely sequentially performing digestion reaction and carbonization reaction on the magnesium solution subjected to impurity removal, then filtering, performing pyrolysis on the filtrate to obtain a semi-finished light magnesium carbonate product, drying and crushing to obtain the light magnesium carbonate product, and drying the precipitate to obtain gypsum. According to the method, magnesium is leached with the sulfuric acid, the magnesium sulfate filtrate is used for preparing high-purity light magnesium carbonate, and the precipitated phase is used for preparing the amorphous white carbon black, so that the extraction rate of magnesium is equal to or greater than 95%, the purpose of complete comprehensive recycling is fulfilled, zero discharge is realized in the whole process and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a light magnesium carbonate prepared by a borate method, a production method and application thereof. Background technique [0002] Light magnesium carbonate is an important inorganic chemical product, widely used in rubber, plastics, food processing, medical and health care, insulating materials, glass and other fields. Light magnesium carbonate has low relative density, light and loose weight, and can be used as a filler and reinforcing agent for rubber products, thereby improving the quality of rubber products. Light magnesium carbonate is non-combustible, releases carbon dioxide and water after pyrolysis, and can be used as a thermal insulation and high temperature resistant fireproof and thermal insulation material in the construction industry. Food grade light magnesium carbonate can be used as an additive, magnesium element supplement. Light magnesium carbonate can also be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/24
CPCC01F5/24
Inventor 吴细霞
Owner 苏州诺济玛金属制品有限公司
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