Novel process for producing high-purify magnesium oxide from salt lake brine

A salt lake brine and magnesium oxide technology, applied in the fields of magnesium oxide, inorganic chemistry, alkali metal chloride, etc., can solve the problems of unstable composition of basic magnesium carbonate, huge equipment, waste of magnesium resources, etc., and achieve product quality and stability, Ease of mass production and high product quality

Inactive Publication Date: 2012-07-25
NAFINE CHEMICAL INDUSTRY GROUP CO LTD
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AI Technical Summary

Problems solved by technology

A significant advantage of the carbonization method over the milk slurry method is that the intermediate product is basic magnesium carbonate, and its filtration performance is better than that of magnesium hydroxide. The disadvantages are: huge equipment, large investment, unstable composition of basic magnesium carbonate, and calcium content in the product High (this problem exists when dolomite or magnesite is used as raw material)
[0003] Sulfate salt lake brine is Na + , Mg 2+ / / SO 4 2- , Cl - -H 2 O Quaternary interactive system, taking Yuncheng Salt Lake in Shanxi as an example, for many years, has been following the process of raising brine in summer and analyzing nitrate in winter, and using Glauber's salt decahydrate as raw material to produce Yuanming powder. Due to the single extraction of sodium sulfate, magnesium salts are enriched , not only affects the product quality of sodium sulfate, but also causes a waste of magnesium resources

Method used

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  • Novel process for producing high-purify magnesium oxide from salt lake brine
  • Novel process for producing high-purify magnesium oxide from salt lake brine

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Filter the brine with diatomaceous earth and react with sodium bicarbonate, the equivalent ratio of magnesium ions to bicarbonate ions is 1:2.02 (or 1:2.03, or 1:2.04, or 1:2.05), and the brine Slowly add it into a saturated sodium bicarbonate solution at 80°C under stirring, react at this temperature for 2 hours, and keep it for 2 hours. After suction filtration, the intermediate product basic magnesium carbonate and mother liquor I are obtained. After washing with deionized water 50 times (or 20 times, or 30 times, or 40 times) the mass of magnesium, calcining at 900°C (or 850°C, or 800°C) for 4 hours (or 2 hours, or 3 hours) to obtain high-purity magnesium oxide products.

[0022] After the mother liquor Ⅰ is directly evaporated and concentrated, it is centrifuged to obtain basic magnesium carbonate and mother liquor Ⅱ. After the above two-step reaction, the conversion rate of magnesium can reach 98%. According to Na + / / SO 4 2- , Cl - —H 2 O ternary phase dia...

Embodiment 2

[0024] Take Mg 2+ 1L of brine with a content of 40g / L and 228g of NaHCO 3 Under the condition of heat preservation at 65°C, the brine was slowly added to the saturated solution of sodium bicarbonate, under stirring at a speed of 30 rpm, the reaction was carried out for 2 hours, and after 2 hours of heat preservation and aging, the solid-liquid separation was carried out. The intermediate product basic magnesium carbonate 500g and mother liquor I were obtained. After washing basic magnesium carbonate with 3.5L of deionized water, the filter cake was calcined at 900°C for 4 hours to obtain 57.7g of magnesium oxide with a mass of 99.13%.

[0025] After directly evaporating and concentrating 1.65L of mother liquor I, centrifuged to obtain 70g of basic magnesium carbonate and 0.67L of mother liquor II. After basic magnesium carbonate was washed, it was calcined at 900°C for 4 hours to obtain 7.8g of magnesium oxide, according to Na + / / SO 4 2- , Cl - —H 2 O ternary phase dia...

Embodiment 3

[0027] Take Mg 2+ 1L of brine with a content of 38g / L and 210g of NaHCO 3 Under the condition of a temperature of 70°C, the brine was slowly added to the saturated solution of sodium bicarbonate, and the reaction was carried out for 2.5 hours under stirring at a speed of 35 rpm. 480 g of intermediate product basic magnesium carbonate and mother liquor I were obtained. After washing basic magnesium carbonate with 3.0L of deionized water, the filter cake was calcined at 850°C for 3 hours to obtain 55.7g of magnesium oxide with a mass of 99.05%.

[0028] After directly evaporating and concentrating 1.55L of mother liquor I, centrifuged to obtain 68g of basic magnesium carbonate and 0.62L of mother liquor II. After basic magnesium carbonate was washed, it was calcined at 900°C for 4 hours to obtain 7.2g of magnesium oxide, according to Na + / / SO 4 2- , Cl - —H 2 O ternary phase diagram After evaporating and concentrating the mother liquor II, centrifuge to obtain 120.8 g of...

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Abstract

The invention discloses a novel process for producing high-purify magnesium oxide from salt lake brine, belongs to the technical field of comprehensive utilization of brine and aims to provide a process for coproducing high-purify magnesium oxide, sodium sulfate and sodium chloride by taking natural salt lake brine and sodium hydrogen carbonate as raw materials. The process comprises the following steps of: blending according to an equivalence ratio of magnesian ions to bicarbonate ions, being (1:2.02)-(1:2.05); separating after reaction to obtain intermediate products, i.e. basic magnesium carbonate and mother liquid I; washing the basic magnesium carbonate with deionized water; calcining the washed basic magnesium carbonate to obtain the high-purify magnesium oxide; evaporating and concentrating the mother liquid I, and then centrifugally separating to obtain the basic magnesium carbonate and mother liquid II; evaporating and concentrating the mother liquid II, and then centrifugingto obtain anhydrous sodium sulfate and mother liquid III; and cooling and crystallizing the mother liquid III to obtain sodium chloride and mother liquid IV. The process has the advantages of realization of comprehensive utilization of brine, simplicity of operation in a reaction process, easiness for industrialized mass production, high magnesium conversion ratio, good product quality, no three-waste emission in the reaction process and favorable environment and societal benefits.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of salt lake brine, and in particular relates to a new process for producing high-purity magnesium oxide from salt lake brine. Background technique [0002] At present, there are several methods for producing magnesium oxide using brine (sea) water as raw materials: ①. Emulsion method, including limestone emulsion method and dolomite emulsion method, that is, magnesium chloride and lime milk in sea (brine) water Slurry (prepared by adding water after calcining limestone or dolomite) reacts to generate magnesium hydroxide, which is then calcined to generate magnesium oxide. The raw material cost of this method is low, and it is the most widely used method abroad. For example, Japan and the United Kingdom generally use this method to produce high-purity seawater magnesia. The main disadvantage is that the product contains high calcium and boron. ②. Ammonia method, using ammonia o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/02C01D5/00C01D3/06
Inventor 王兰君许涛荆小兵高战备贾明庆伍洲生于慧霞
Owner NAFINE CHEMICAL INDUSTRY GROUP CO LTD
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