Method for producing fibrous basic magnesium chloride Mg2(OH)3Cl.4H2O3monocrystal

Abstract

The invention relates to a method for preparing fibrous alkali magnesium chloride Mg2(OH)3Cl.4H2O single crystal. The single crystal is prepared by the following compounds in weight percentage: 80.53 to 85.13 percent of crystal magnesium chloride, 9.3 to 13.87 percent of calcium chloride, and 5.29 to 5.58 percent of calcium hydroxide. The method for preparing the fibrous alkali magnesium chloride Mg2(OH)3Cl.4H2O single crystal by the compounds comprises the following steps: preparing the magnesium chloride and the calcium chloride into aqueous solution; adding calcium hydroxide powder to the aqueous solution; heating the mixed solution to the temperature of between 50 and 90 DEG C under the condition of continuously stirring, and controlling the pH value of the solution to between 8 and 9; stopping heating the solution and keeping the solution stand after the reacting solution is completely changed into white suspension; placing the suspension in an oven for boiling for 2 to 4 days at a temperature of between 50 and 90 DEG , after the suspension is deposited; and washing and filtering the deposition to obtain the fibrous alkaline magnesium chloride which has the diameter of between 0.2 and 3 microns and the length of between 10 and 100 microns, and has the advantages of high purity, good uniformity of crystal shape and stable composition.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and relates to fibrous basic magnesium chloride Mg under normal pressure 2 (OH) 3 Cl 4H 2 The invention discloses a preparation method of O single crystal, which is used to manufacture a flame retardant as an important precursor of magnesium aluminum hydrotalcite, fire protection or decoration materials. Background technique [0002] Basic magnesium chloride whiskers have the characteristics of good whiteness, strong activity and ultra-fineness, and have broad application prospects in the fields of flame retardancy, papermaking, fire protection and thermal sol fillers. Moreover, it is also an important precursor of flame retardants magnesium hydroxide whisker, magnesium oxide whisker and magnesium aluminum hydrotalcite. [0003] Fire prevention is a theme of modern social security. The development and application of applied materials with flame retardant function, so that the mater...

AI Technical Summary

Problems solved by technology

The disadvantage of the brine-ammonia method is that ammonia water is used under heating and stirring, because ammonia water is a volatile, corrosive and irritating liquid, which increases the danger of the preparation process or industrial production

[0013] (1) The use of ordinary light magnesium oxide, due to its activity, makes the reaction time too long (up to 72 hours, and it must be stirred and heated at the same time), which increases the complexity and cycle of process control

[0014] (2) The product needs to be washed multiple times, and the precipitate is washed with different solvents, which increases the complexity and cycle of process control

[0019] Secondly, the preparation method proposed in Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Ningxia Institute of Coal Science and Technology and Dalian University of Technology, and Japanese Patent (Open Patent Publication 54-112400 "Fibrous Magnesium Hydroxide and Its Manufacturing") is two Step method, although the methods used are different, but the autoclave is used in the reaction process, and the reaction is carried out under pressure, which increases the complexity of the entire process

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