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1. The sulphuric acid method is based on dolomite, serpentine and magnesite. Participate in water or mother liquor in the neutralizer. Then sulfuric acid and bitter soil powder containing more than 85% magnesium oxide will gradually participate in the neutralizer in a certain proportion to neutralize the reaction. Ph=5 is controlled and the concentration is 39-40 degree B_. Stir for 30 minutes to make the reaction fully carried out. The reaction equation is as follows: the neutralizing liquid is kept at 80 C, the filtrate filtered is fed into the mould, a suitable amount of seed is added, then cooled, filtered and centrifuged separately, and then dried at 50-55 C, magnesium sulfate is obtained. The mother liquor is returned to be used as ingredient. 2. Natural transpiration of bittern from recrystallization Salt Lake concentrates into crude magnesium (crude magnesium sulfate). With crude magnesium as raw material, the industrial magnesium sulfate products were prepared by adding water-soluble solution at 80-90 C, then clarifying at 60-70 C, cooling crystallization at 20-25 C, centrifugal separation and dryness. Magnesium sulfate for medicine was prepared by immersing industrial magnesium sulfate in distilled water, adjusting Ph value with sulfuric acid, centrifugal separation, dry dehydration and recrystallization.
3. Bitter brine is obtained from sea water salt by sea water salt-drying and bittern-drying. After transpiration by adding halogen method, high temperature salt is produced. Its composition is MgSO4 > 30%, NaCI < 35%, MgCl2 is about 7%, KCl is about 0.5%. Bittern can be dissolved in 200g/L MgCl2 solution at 48 C. NaCl dissolves less, while MgSO4 dissolves more. After separation, coarse MgSO4 7H_2O was precipitated from the leaching solution when it was cooled to 10 C, and the product was recrystallized twice.
With strong stirring, 30% of the hot sulphuric acid solution was gradually added to the magnesium carbonate until the liquid no longer froth. When the filtrate is tested with NH4SCN solution, some magnesium carbonate should be added to the filtrate if it shows red color, until it can not dissolve. Fill while it is hot. Cool the filtrate and let it stand overnight. The precipitated crystals are dried and washed with a small amount of ice water. At last, recrystallization was carried out according to 40 mL water per 100 g salt.
4. Purification: Using the co-deposition effect of newly deposited Mg(OH)2, impurities such as Ni, Co, Fe, Zn and Cu can be removed from MgSO 4. In polyethylene cup, NaOH solution was added to the solution containing 2G MgSO4.7H2O to form Mg(OH)2 deposit, which was washed out. The deposit was added to the exuberant solution containing 200-240g MgSO4.7H2O (analytical purity). The mixture was stirred intensely for 30 minutes, then stayed overnight, and the transparent solution was siphoned out by siphon method. The solution of MgSO4 with high purity can be obtained. From this solution, more pure MgSO4.7H2O crystals can be crystallized. In natural magnesium carbonate (magnesite), sulfuric acid is added and recrystallized after removing carbon dioxide. Kieserite (MgSO4. 7H2O) is dissolved in hot water and recrystallized. 5. Dissolve 20 kg industrial magnesium sulfate (the lower the chlorine content is, the better) with 30 kg distilled water. Participate in slightly excessive silver sulfate solution (determined by the chlorine content of the material). After stirring, check the chlorine content in the solution to be qualified. Filtrate. Stir in the clarified magnesium sulfate solution while adding appropriate amount of magnesium carbonate to make the solution slightly alkaline, so as to remove the 2 + ion of the flesh and pass sulfurization. Hydrogen was filtered for 15 minutes after 24 hours. The filtrate slowly participated in 0.25-0.5 mol/l sulfuric acid solution. Continuous sampling and analysis: 4 drops of bromothyme blue indicator were added to 10 ml sample, and acid addition was stopped when the solution became blue. Magnesium sulfate was obtained by transpiration concentration (about 110 C), cooling and crystallization, centrifugal drying and drying at 50 - 60 C (not exceeding this temperature). 6. In a small white porcelain cylinder, 1 kg high purity magnesium oxide was stirred into paste by 1000ml conductive water, and 30% high purity sulfuric acid was slowly dripped into magnesium oxide for reaction.
When the foam is less, stop adding acid, leave a little Magnesium Oxide, 15min and filter. The filtrate is connected to the glass-lined pot, transpired and concentrated to form a thin film, cooled and crystallized directly with cold water, and centrifugally dried. Magnesium sulfate heptahydrate can be obtained by washing twice with cold conductive water and crystallizing in the oven of white porcelain plate at low temperature and dry. If the quality index is not reached, it can be recrystallized again. To prepare anhydrous magnesium sulfate, anhydrous magnesium sulfate can be obtained by carefully heating magnesium sulfate heptahydrate to 238 C.
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