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Method for producing high-purity magnesium oxide by reduction and pyrolysis of magnesium sulphate by using natural gas

A technology of magnesium sulfate and natural gas, applied in magnesium oxide and other directions, can solve the problems of low purity of magnesium oxide, polluted environment by tail gas, low pyrolysis efficiency, etc., and achieve the effects of easy control of reaction conditions, high pyrolysis efficiency and simple process.

Inactive Publication Date: 2013-04-24
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0007] The purpose of the present invention is to solve the existing problems of high cost, low pyrolysis efficiency, low purity of magnesium oxide obtained, many process parameters, difficult control, and tail gas polluting the environment in the existing method

Method used

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  • Method for producing high-purity magnesium oxide by reduction and pyrolysis of magnesium sulphate by using natural gas
  • Method for producing high-purity magnesium oxide by reduction and pyrolysis of magnesium sulphate by using natural gas

Examples

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Effect test

Embodiment 1

[0018] (1) Dehydrate magnesium sulfate heptahydrate with a purity greater than 99% at 500°C for 4 hours to obtain anhydrous magnesium sulfate, which is then ground and sieved, and -120 mesh accounts for 80%;

[0019] (2) Put 100 g of anhydrous magnesium sulfate prepared in step 1 into the reactor, and raise the temperature to 900°C;

[0020] (3) Pass natural gas (methane content greater than 98%) into a reactor equipped with anhydrous magnesium sulfate for reduction pyrolysis, control the flow rate of natural gas to 160ml / min, and the reaction time to 0.5 h;

[0021] (4) Turn on switch 1, turn off switches 2 and 3 at the same time, pass the sulfur dioxide gas generated by the reduction pyrolysis reaction into the reactor 11, and turn on the switch of the oxygen cylinder at the same time, and convert it into sulfur trioxide under the catalytic oxidation of the vanadium catalyst , sulfur trioxide is passed into the 98.3% concentrated sulfuric acid absorption bottle 12, the conce...

Embodiment 2

[0029] (1) Dehydrate magnesium sulfate heptahydrate with a purity greater than 99% at 550°C for 3 hours to obtain anhydrous magnesium sulfate, which is then ground and sieved, and -150 mesh accounts for 80%;

[0030] (2) Put 300 g of anhydrous magnesium sulfate prepared in step 1 into the reactor, and raise the temperature to 950°C;

[0031] (3) Pass natural gas (methane content greater than 98%) into the reactor equipped with anhydrous magnesium sulfate, control the flow rate of natural gas to 480ml / min, and the reaction time to 0.5 h;

[0032] (4) Turn on the switch 2 and turn off the switches 1 and 3 at the same time, pass the sulfur dioxide produced by the reduction pyrolysis reaction into the absorption bottle 10 filled with pyrolusite slurry, remove impurities, filter, evaporate and crystallize the obtained adsorption liquid, and dry Obtain manganese sulfate, the carbon dioxide gas that produces absorbs with lime water, filters and obtains calcium carbonate, and excessiv...

Embodiment 3

[0038] (1) Dehydrate magnesium sulfate heptahydrate with a purity greater than 99% at 600°C for 2 hours, then grind it finely, sieve it, and -180 mesh accounts for 80%;

[0039] (2) Put 600 g of anhydrous magnesium sulfate prepared in step 1 into the reactor and raise the temperature to 1000°C;

[0040] (3) Pass natural gas (methane content greater than 98%) into the reactor, control the flow of natural gas to 960ml / min, and the reaction time to 0.5 h;

[0041] (4) Turn on the switch 3, turn off the switches 1 and 2 at the same time, pass the sulfur dioxide produced by the reduction pyrolysis reaction into the absorption bottle 7 filled with sodium hydroxide solution to generate a sodium sulfite solution, purify the sodium sulfite solution, evaporate, crystallize, and dry Obtain anhydrous sodium sulfite, the carbon dioxide gas that produces absorbs with lime water, obtains calcium carbonate after filtering, and excessive natural gas is collected in the collecting bottle 9;

...

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Abstract

The invention belongs to the field of production of high-purity magnesium oxide and provides a method for producing high-purity magnesium oxide by reduction and pyrolysis of magnesium sulphate by using natural gas. The method comprises the following steps of: 1) calcining magnesium sulphate heptahydrate which has purity of over 99 percent and serves as a raw material for 2 to 4 hours at the temperature of 500 to 600 DEG C to obtain anhydrous magnesium sulphate, and carrying out fine grinding for later use; 2) carrying out reduction and pyrolysis on the anhydrous magnesium sulphate in a reactor by using the natural gas to obtain a solid-phase product, namely the magnesium oxide with the purity of over 99 percent, wherein conversion rate is over 99 percent, and gas-phase products such as carbon dioxide and sulphur dioxide are obtained; and 3) absorbing tail gas to obtain valuable by-products such as calcium carbonate, sodium sulphate, sodium sulphite or manganese sulphate. By the invention, the production of the high-purity magnesium oxide is realized, pyrolysis efficiency is improved, the valuable by-products are produced by making full use of the tail gas which is generated by thepyrolysis, environmental pollution is avoided, and production cost is reduced.

Description

technical field [0001] The invention belongs to the field of high-purity magnesium oxide production, and relates to a method for producing high-purity magnesium oxide by using natural gas to reduce and pyrolyze magnesium sulfate. Background technique [0002] High-purity magnesium oxide (magnesia content ≥ 98%) has excellent acid and alkali resistance and electrical insulation at high temperatures, good light transmission, high thermal conductivity, and large thermal expansion coefficient. It is an important inorganic chemical product. It is widely used in medicine, ceramics, electronics, electrical appliances and other industries. [0003] The method that magnesium sulfate prepares magnesium oxide at present has the following several kinds: [0004] Chaidoli studied the conditions for the synthesis of magnesium hydroxide precursors to prepare high-purity magnesium oxide by calcining industrial magnesium sulfate and sodium hydroxide as raw materials. Under the optimal proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/12
Inventor 冯雅丽李浩然马玉文张萍
Owner UNIV OF SCI & TECH BEIJING
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