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New technology for producing high-purity active magnesium oxide by using waste residue of magnesium metal smelting

A technology of activated magnesia and a new process, which is applied in the direction of magnesia, non-metallic elements, and preparation of chlorides, etc., can solve the problems of limited and unsatisfactory high value-added output, and achieve good production efficiency, low cost, and great benefits Effect

Inactive Publication Date: 2017-02-08
李卿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country is a big producer of magnesium oxide, and a large number of primary products of low-purity and low-grade magnesium oxide are exported, but on the other hand, the production of high-tech and high-value-added products such as high-purity active magnesium oxide is very limited, which cannot meet the development requirements of my country's industrial production. , relying on imports for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Get 1kg of magnesium slag, the content in the magnesium slag is measured through chemical testing: MgCl 2 500g, MgO350g, crush the magnesium slag into 5cm particles, add it to 3500ml of dilute hydrochloric acid with a concentration of 20%, and stir the solution to obtain a MgCl solution with a concentration of 28%, which is filtered through 40 mesh and 600 mesh sieves respectively. Slag, add sodium hypochlorite 27.5g, control the pH value after the reaction to be 7.0, after the reaction finishes, filter to obtain clear liquid, add 220gNa 2 CO 3 , the temperature is controlled at 40°C, and the precipitate is removed by filtration while it is hot to obtain a 32% refined magnesium chloride solution, which is sent to the flash spray drying tower, the air intake and feed amount are controlled, and the pyrolysis temperature is controlled at 750°C , Dehydrate the magnesium chloride solution to obtain magnesium oxide and basic magnesium chloride, release hydrogen chloride gas,...

Embodiment 2

[0041] Get 1.5kg of magnesium slag, the content in the magnesium slag is measured through chemical testing: MgCl 2 700g, MgO570g, crush the magnesium slag into 6cm particles and add it to 5000ml of dilute hydrochloric acid with a concentration of 22%. After stirring the solution, a MgCl solution with a concentration of 20% can be obtained, and filter the slag through 40 mesh and 600 mesh sieves respectively. , add sodium hypochlorite 52g, control the pH value after the reaction to be 7.2, after the reaction finishes, filter to obtain clear liquid, add 325gNa 2 CO 3 , the temperature is controlled at 45°C, and the precipitate is removed by filtration while it is hot to obtain a 30% refined magnesium chloride solution, which is sent to the flash spray drying tower, the air intake and feed amount are controlled, and the pyrolysis temperature is controlled at 720°C , Dehydrate the magnesium chloride solution to obtain magnesium oxide and basic magnesium chloride, release hydrogen...

Embodiment 3

[0043] Get 2kg of magnesium slag, the content in the magnesium slag is measured through chemical testing: MgCl 2 650g, MgO800g, crush the magnesium slag into 8cm particles and add it to 5000ml of dilute hydrochloric acid with a concentration of 18%. After stirring the solution, a MgCl solution with a concentration of 20% can be obtained, and filter the slag through 40 mesh and 600 mesh sieves respectively. , add sodium hypochlorite 70g, control the pH value after the reaction to be 7.2, after the reaction finishes, filter to obtain clear liquid, add 420gNa 2 CO 3 , the temperature is controlled at 50°C, and the precipitate is removed by filtration while it is hot to obtain a 33% refined magnesium chloride solution. The solution is sent to the flash spray drying tower, the air intake and feed amount are controlled, and the pyrolysis temperature is controlled at 740°C , Dehydrate the magnesium chloride solution to obtain magnesium oxide and basic magnesium chloride, release hyd...

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Abstract

New technology for producing high-purity active magnesium oxide by using waste residue of magnesium metal smelting adopts waste residue of magnesium smelting as a raw material. The technology comprises: raw material crushing, acid dissolution, filtration, impurity removal, refining, dehydration, dynamic thermal crushing and washing, drying and dynamic calcination. The magnesium oxide product is high in purity and activity, low in calcium and boron, high and stable in quality, and extremely low in cost. The technology allows resources to be saved and efficiently cycled, is free of pollution and simple in production process, allows continuous circulating production to be achieved, and is significant in production benefit.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and relates to a method for preparing metal oxides, in particular to a new process for producing high-purity active magnesium oxide by utilizing the waste residue of metal magnesium smelting. Background technique [0002] Since 2000, China has become the country with the largest magnesium production in the world. The total installed capacity of domestic magnesium metal (magnesium alloy) enterprises has exceeded 900,000 tons. Following the continuous development of metal magnesium in recent years, the domestic consumption of metal magnesium is 700,000 tons. my country has become a veritable production base of magnesium metal. It is mainly released in Shanxi: 200,000 T / year, Shaanxi 400,000 T / year, and Ningxia 200,000 T / year. While the magnesium smelting industry is rapidly improving, it also brings a huge environmental burden. China's current magnesium industry has the disadvan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/10C01F5/02C01B7/03
CPCC01B7/035C01F5/02C01F5/10
Inventor 杨志刚
Owner 李卿
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