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Two comprehensive utilization methods of boron mud, giobertite and talc deposit for preparing magnesia and silicon dioxide

A technology of silica and magnesite, which is applied in the field of comprehensive utilization of magnesium and silicon resources, and can solve the problems of secondary pollution and unutilized resources

Inactive Publication Date: 2009-01-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1: Using boron mud and melamine waste liquid as raw materials, high-activity light magnesium oxide is produced through acidification, purification, carbonation, and calcination. The disadvantage is that other components in boron mud have not been utilized and cause secondary pollution; 2: Magnesium in the boron mud is leached with a certain concentration (30%) of sulfuric acid, and sodium carbonate is used as a precipitating agent to prepare magnesium carbonate, which is filtered, washed, dried, and calcined to obtain magnesium oxide. The disadvantage is that the boron mud Other components have not been utilized, and there is also a by-product of Glauber's salt, causing secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The raw material is boron mud produced in Liaoning, the composition is: MgO: 41%, CO 2 : 30%, SiO 2 : 19%, B 2 O 3 : 2%, Fe 2 O 3 : 4.0%, CaO: 1.8%, Al 2 O 3 : 2.2%.

[0050] Grind the boron mud to less than 40μm, and remove iron by strong magnetic separation so that the iron content is 0.3%. Then, sulfuric acid with a concentration of 50% was added, the mass volume ratio of boron mud and concentrated sulfuric acid was 1:4, heated to 100 ° C, and reacted under normal pressure for 4 hours, then solid-liquid vacuum separation was performed, and the filtrate was magnesium sulfate and the reaction The remaining sulfuric acid and the filter residue are silica and a small amount of impurities. The filtrate was evaporated to obtain MgSO 4 ·7H 2 O, according to the evaporative crystallization conditions, the appearance of the product can be white or colorless crystalline particles or powder. After inspection, it has reached the HG / T 2680-95 standard.

[0051] The ab...

Embodiment 2

[0056] The raw material is boron mud produced in Liaoning, the composition is MgO: 42%, CO 2 : 31%, SiO 2 : 18%, B 2 O 3 : 2%, Fe 2 O 3 : 3.5%, CaO: 1.5%, Al 2 O 3 :2%.

[0057] Grind the boron mud to 40μm, and remove iron by strong magnetic separation to make the iron content 0.3%. Then, sulfuric acid with a concentration of 60% was added, and the mass-volume ratio of boron mud to sulfuric acid was 1:4, heated to 120° C., and reacted under normal pressure for 3 hours, and then separated from solid-liquid under reduced pressure. The filtrate was magnesium sulfate and the remainder of the reaction The sulfuric acid, the filter residue contains silica and impurities. The filtrate was evaporated to obtain MgSO 4 ·7H 2 O. The appearance of the product obtained according to the evaporative crystallization conditions is white or colorless crystalline particles or powder, and the inspection meets the HG / T 2680-95 standard

[0058] The above MgSO 4 ·7H 2 O was dehydrated...

Embodiment 3

[0063] The raw material is boron mud produced in Liaoning, the composition is: MgO: 42%, CO 2 : 31%, SiO 2 : 18%, B 2 O 3 : 2%, Fe 2 O 3 : 3.5%, CaO: 1.5%, Al 2 O 3 :2%.

[0064] Grind the boron mud to less than 40μm, and remove iron by strong magnetic separation so that the iron content is 0.3%. Then it was mixed with NaOH at a mass ratio of 1:5, and reacted at 450° C. for 3 hours. After the reaction, the temperature was lowered to 90° C., 2 times the volume of water was directly added, and the mixture was stirred at 60° C. for 50 min. Filtration and separation, the filtrate is sodium silicate and unreacted sodium hydroxide solution; the filter residue is mainly Mg(OH) 2 , three times of countercurrent washing of the filter residue, the amount of water added each time is 1 to 5 times the quality of the residue, and stirred at 70 ° C for 35 minutes.

[0065] Adjust the concentration of sodium silicate solution to SiO with water 2 After the mass percentage is 45%, it...

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Abstract

The invention provides two environment-friendly metallurgy methods for comprehensively utilizing boron sludge, magnesite and talc ore to prepare magnesium oxide and silicon dioxide. The methods comprise the following: (1) steps of milling, carrying out magnetic separation for iron removal, carrying out acid treatment, carrying out alkali treatment, preparing magnesium oxide and carrying out carbonation decomposition for preparing silicon dioxide; and (2) steps of milling, carrying out magnetic separation for iron removal, carrying out alkali treatment, carrying out water soaking treatment, filtering, separating, preparing magnesium oxide and carrying out carbonation decomposition for preparing silicon dioxide. The invention has the advantages that the methods allow all reaction media to be reclaimed, are simple in process flow and equipment, discharge no solid, liquid or gaseous waste, cause no secondary pollution, can use lower cost to realize the high added value comprehensive utilization of magnesium and silicon in the boron sludge, the magnesite and the talc ore.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of magnesium and silicon-containing resources, in particular to two methods for comprehensively utilizing boron mud, magnesite and talc to prepare magnesium oxide and silicon dioxide. Background technique [0002] Boron mud is the industrial waste residue discharged from the production of boric acid and borax from boron-magnesium (iron) ore. Boron mud is light red in color, fine in particle, sandy, and its main components are MgO and SiO 2 . Its typical composition is MgO: 35-39%, CO 2 : 29 to 31%, SiO 2 : 18 to 20%, B 2 O 3 : 2 to 5%, Fe 2 O 3 : 3.3 to 4.6%, CaO: 1.5 to 2%, Al 2 O 3 : 2 to 2.5%. After the boron mud is discharged, it is often piled up and stored, and there is no grass in the stacking place, which will cause serious pollution to the surrounding environment. Its own infiltration and rainwater erosion can also make the polluted components of the boron mud ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/12C01B33/113C01F11/06C01B31/20C01B32/50
Inventor 翟玉春宁志强王伟刘岩顾惠敏李在元谢宏伟吴艳牟文宁管秀荣
Owner NORTHEASTERN UNIV
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