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Method and device for producing high-purity magnesium oxide and co-producing industrial concentrated hydrochloric acid through partially hydrated magnesium chloride fluidization pyrolysis

A technology of hydrated magnesium chloride and magnesium oxide, applied in the fields of magnesium oxide, chemical industry, chlorine/hydrogen chloride, etc., can solve the problems of high energy consumption, no fluidized pyrolysis device for fluidized pyrolysis process, low product purity, etc. problem, to achieve the effect of less water vapor content

Inactive Publication Date: 2015-12-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of this method are: there is too much moisture in the raw material, dilute hydrochloric acid can only be produced by-product; the waste heat in the process is not fully utilized, the energy consumption is high, and the purity of the product is not high
Although this method provides a feasible process for producing high-purity magnesia, it does not provide a detailed fluidized pyrolysis process and a matching fluidized pyrolysis device, nor does it provide hydrochloric acid from pyrolysis tail gas Specific methods of by-products

Method used

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  • Method and device for producing high-purity magnesium oxide and co-producing industrial concentrated hydrochloric acid through partially hydrated magnesium chloride fluidization pyrolysis
  • Method and device for producing high-purity magnesium oxide and co-producing industrial concentrated hydrochloric acid through partially hydrated magnesium chloride fluidization pyrolysis

Examples

Experimental program
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Effect test

example 1

[0079] Example 1: Preparation of magnesium oxide by fluidized pyrolysis at 700°C

[0080] Preparation of low hydrated magnesium chloride from halogen grains. Halogen grains are solid materials obtained by evaporating, concentrating and granulating the old brine solution. In addition to the evaporation of water, other chemical components in the brine grains are no different from the old brine. The specific steps of preparing low hydrated magnesium chloride with halogen grains as raw materials are as follows: firstly, dissolve halogen grains in pure water to prepare a saturated liquid, remove color through activated carbon adsorption, use isooctyl alcohol as an extraction agent, and use sulfonated kerosene as a diluent for extraction. After the boron and barium chloride solution precipitated sulfate radical impurities, the magnesium chloride hexahydrate crystals with a purity greater than 99.5% were obtained by evaporation and crystallization, and the magnesium chloride hexahyd...

example 2

[0082] Example 2: Preparation of magnesium oxide by fluidized pyrolysis at 650°C

[0083] The preparation technology of low hydrate magnesium chloride solid particle material is identical with example 1.

[0084] Turn on the power of the air preheater and the electric heating furnace, control the air outlet temperature of the air preheater to 350°C, and control the electric heating furnace so that the temperature in the fluidized bed pyrolysis furnace is 650±10°C. The fluidized bed pyrolysis furnace is made of quartz glass, the inner diameter of the reactor is 40mm, and the height is 1.2m. Open the compressed air source, and control the volume flow rate of the incoming air to 3m through the flowmeter 3 / h. Weigh 300g of low hydrated magnesium chloride solid particles containing 2 crystal waters. When the set temperature is reached, start feeding in batches, adding 100g of solid material every 5 minutes. The solid material undergoes fluidized pyrolysis reaction under the set...

example 3

[0085] Example 3: Preparation of magnesium oxide by fluidized pyrolysis at 600°C

[0086] The preparation technology of low hydrate magnesium chloride solid particle material is identical with example 1.

[0087] Turn on the power of the air preheater and the electric heating furnace, control the air outlet temperature of the air preheater to 350°C, and control the electric heating furnace so that the temperature in the fluidized bed pyrolysis furnace is 600±10°C. The fluidized bed pyrolysis furnace is made of quartz glass, the inner diameter of the reactor is 40mm, and the height is 1.2m. Open the compressed air source, and control the volume flow rate of the incoming air to 3m through the flowmeter 3 / h. Weigh 300g of low hydrated magnesium chloride solid particles containing 2 crystal waters. When the set temperature is reached, start feeding in batches, adding 100g of solid material every 5 minutes. The solid material undergoes fluidized pyrolysis reaction under the set...

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Abstract

The invention provides a method and device for producing high-purity magnesium oxide and co-producing industrial concentrated hydrochloric acid through partially hydrated magnesium chloride fluidization pyrolysis. The method includes the following steps that firstly, a partially hydrated magnesium chloride solid material is subjected to fluidization pyrolysis in a fluidized bed pyrolysis furnace and subjected to gas-solid separation, and rough magnesium oxide and pyrolysis tail gas are obtained; secondly, the rough magnesium oxide is cooled and subjected to aftertreatment, and high-purity magnesium oxide is obtained; thirdly, the pyrolysis tail gas is used for preparing the industrial concentrated hydrochloric acid. The method can be used for producing the high-purity magnesium oxide and co-producing the industrial concentrated hydrochloric acid; besides, the resource utilization rate of the method is high, little three wastes are generated, heat efficiency in the process is high, production cost is low, product purity is high, quality is stable, and the method is particularly suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and relates to a method and device for producing high-purity magnesium oxide with low-hydration magnesium chloride, in particular to a method and device for producing high-purity magnesium oxide by fluidized pyrolysis of low-hydration magnesium chloride solid particle materials, and simultaneously absorbing pyrolysis tail gas A method and device for co-producing industrial concentrated hydrochloric acid. Background technique [0002] High-purity magnesium oxide generally refers to magnesium oxide products with a purity greater than 99%. High-purity magnesium oxide is widely used in rubber, high-grade cables, ceramics, high-grade paper and pharmaceutical industries, and is also an essential chemical raw material for the production of oriented silicon steel sheets. Domestic magnesite is mainly produced by high-temperature calcination of magnesite. The disadvantage of this metho...

Claims

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Application Information

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IPC IPC(8): C01F5/10C01B7/03
CPCY02P20/10
Inventor 卢旭晨闫岩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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