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Method for preparing calcined dolomite for silicothermic process magnesium production by aid of carbide slag and bischofite

A technology of bischite and calcium carbide slag, applied in magnesium oxide and other directions, can solve the problems of rising lime prices and the impact of cost advantages, and achieve the effects of sufficient raw materials, increased cost advantages, and reduced energy consumption

Inactive Publication Date: 2012-08-01
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this technology is: According to the practical investigation, the original by-product lime is now mainly used in building materials and other industries, and the price of its lime has risen to a certain extent, which has a significant impact on the cost advantage of this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1 A kind of method utilizing carbide slag and bischofite to prepare calcined white for smelting magnesium by silicothermal method, the method refers to first weighing 709g carbide slag (Ca(OH) 2 content is 58.5%), add 2400ml tap water, stir for 10 minutes, add 600ml magnesium chloride saturated solution (concentration is 4.6716mol / L), Ca(OH) 2 and MgCl 2 The molar ratio is 2:1, stirred and reacted at room temperature for 1 hour, and a mixed slurry of calcium hydroxide and magnesium hydroxide is generated after sufficient reaction; then, the slurry is subjected to solid-liquid separation to obtain a solid precipitate; secondly, use tap water (The amount of water is twice the mass of the solid precipitate) Wash the solid precipitate 3 times, and dry the solid precipitate to a constant weight to obtain a dry solid powder. The molar ratio of magnesium to calcium in this dry solid powder is 1.11:1 , Cl - The content is 0.93%, and the conversion rate of magnesiu...

Embodiment 2

[0015] Example 2 A kind of method that utilizes calcium carbide slag and bischofite to prepare calcined white for smelting magnesium by silicothermal method, this method refers to first weighing 515.3g calcium carbide slag (Ca(OH) 2 content is 80.5%), add 2400ml tap water, stir for 10 minutes, add 600ml magnesium chloride saturated solution (concentration is 4.6716mol / L), Ca(OH) 2 and MgCl 2 The molar ratio is 2:1, stirred and reacted at room temperature for 1 hour, and a mixed slurry of calcium hydroxide and magnesium hydroxide is generated after sufficient reaction; then, the slurry is subjected to solid-liquid separation to obtain a solid precipitate; secondly, use tap water (The amount of water is twice the mass of the solid precipitate) Wash the solid precipitate 3 times, and dry the solid precipitate to a constant weight to obtain a dry solid powder. The molar ratio of magnesium to calcium in this dry solid powder is 1.15:1 , Cl - The content is 0.95%, and the con...

Embodiment 3

[0016] Example 3 A kind of method utilizing carbide slag and bischofite to prepare calcined white for smelting magnesium by silicothermal method, the method refers to first weighing 607g carbide slag (Ca(OH) 2 Content is 58.5%) and 485g magnesium chloride solid (MgCl 2 content is 45.5%), add 1600ml tap water, stir for 10 minutes, Ca(OH) 2 and MgCl 2 The molar ratio is 2:1, stirred and reacted at room temperature for 1 hour, and a mixed slurry of calcium hydroxide and magnesium hydroxide is generated after sufficient reaction; then, the slurry is subjected to solid-liquid separation to obtain a solid precipitate; secondly, use tap water (The amount of water is twice the mass of the solid precipitate) Wash the solid precipitate 3 times, and dry the solid precipitate to a constant weight to obtain a dry solid powder. The molar ratio of magnesium to calcium in the dry solid powder is 1.02:1 , Cl - The content is 0.89%, and the conversion rate of magnesium is 100%. Finally...

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Abstract

The invention relates to a method for preparing calcined dolomite for silicothermic process magnesium production by the aid of carbide slag and bischofite. The method includes the steps: firstly, placing magnesium chloride and the carbide slag into water, performing stirring reaction for 0.5-3h at the normal temperature and generating mixed slurry of calcium hydroxide and magnesium hydroxide after sufficient reaction; secondly, performing solid-liquid separation for the slurry to obtain sediment; thirdly, washing the solid sediment, drying the solid sediment to reach constant weight and obtaining dried solid powder; and finally, calcining the dried solid powder for 0.5-3h at the temperature of 600-1000 DEG C to obtain the calcined dolomite. The carbide slag serving as raw materials is turned from harm into good and turned from waste into wealth, and the whole technical process is simple, easily controlled, non-corrosive to equipment and applicable to metallic magnesium production by the aid of a Pidgeon process for regions with high carbide slag byproduct yield or rich magnesium chloride resources.

Description

technical field [0001] The invention relates to the field of light metal smelting, in particular to a method for preparing calcined white for silicothermal magnesium smelting by using carbide slag and bischofite. Background technique [0002] Magnesium is one of the lightest structural metal materials. It is ductile, non-magnetic and has good heat dissipation. It is a very important metal material at this stage and in the future. At present, the main methods of industrial production of magnesium metal are Pidgeon method and electrolysis method: Pidgeon method uses dolomite ore as raw material and adopts silicothermal reduction to produce metal magnesium. This method has the characteristics of small investment, low cost, and easy control. At present, more than 85% of metal magnesium is produced by the Pidgeon method, but the disadvantage of the Pidgeon method is that the process uses dolomite to be calcined at high temperature (above 1200°C) to obtain calcined white, which h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/02C22B26/22
Inventor 祁米香王树轩唐宏学李波杨占寿王舒娅李宁
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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