The,production,boron,chemicals business, insurance The production of boron chemicals
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In a broad perspective, boron chemicals refer to the mining and processing of boronresource (borax, boric acid, boron powder, calcium borate and other primary products production), deep processingof primary borides, including a variety of special boron chemicals, fine boroncompounds, the production of boron-containing new materials.Boraxalso known as sodium pyroborate, scientific name is ten water sodiumtetraborate. Chemical formula is Na2B4O710H2O.Relative atomic mass is 381.37. It is a colorless translucent crystals or whitecrystalline powder, monoclinic, odorless, salty taste, weathering in dry air.Heated to 60 losing eightmolecules water, when heated to 350-400is completely dehydrate become anhydrous salt melts, when heated to 878is a glass form product. Melted borax can dissolve many metal oxides, generateda complex salt of metaborate which with a characteristic color.Borax iseasy to soluble in water and glycerin, insoluble in ethanol and acid, aqueoussolution is weak alkaline. When higher than 56,the solution separate out five salt precipitates; while below 56will separate out ten salt precipitates. Solubility in water wasrising as the temperature. In borax products also have borax pentahydrate. Of whichborax pentahydrate is a white crystalline powder. When heated to 122will completely loss crystal water become anhydrous salt.Boricacid, chemical formula is H3BO3. Relative atomic mass is 61.83.According to metal powder supplier,boric acid is white crystalline powder or three oblique axial plane scaly with shinycrystals, no odor, have greasy feel. Dissolved in water, ethanol, glycerol,ethers and essential oils, the solubility in water increases with temperaturerise, the solubility in inorganic acid is less than in water, slightlysolubility in acetone. The aqueous solution is acidic. When heated to 70-100will gradually dehydrate become metaboric acid, when 150-160become pyroborate, when 300become boric anhydride (B2O3), easy to form esters withalcohols. However, with polyols, especially can with structural position formtwo hydroxy groups ester type complex ions. Aqueous solution has weak bactericidaleffect, a small amount showing a gentle physiological role, a large dose cancause shock then affect the central nervous system.Produceborax methods include acid, ordinary pressure alkaline hydrolysis, carbon alkalineand water leaching solution method. Among them, the ordinary pressure alkaline hydrolysis is suitable for processing aschariteand boron sodium solution mining, carbon alkaline method is suitable for treatinglower grade ascharite, water leaching solution method is suitable for handlingnatural borax mines. Currently is mainly used carbon alkaline method.Themethod of producing boric acid by treatment method can be divided into one-stepand two-step method. One-step method is used inorganic acids directly treatboron-containing mineral. Of which including sulfuric acid, hydrochloric acid,nitric acid method. At present, Chinese boron acid industry is mainly used sulfuricacid method. Two-step method is based on sulfuric acid, hydrochloric acid,nitric acid treat industrial borax (decahydrate borax or borax pentahydrate) toprepare boric acid, wherein the sulfuric acid method was an earlier productionprocess adopted in China.In recent years, nitric acid treating borax decahydrate and borax pentahydrate toproduce boric acid, the nitrate method process of sodium nitrate developedrapidly and has become China'simportant two-step process for boric acid.Sulfuricacid as decomposers treating boron minerals one step process, the advantage is maturetechnology, the process is simple, less investment in equipment, easyoperation. Therefore, has long been subject to people's attention. But thereare also requirements for higher grade, not suitable for processing low-gradeboron; serious corrosion of equipment; product quality control in largerlimitations, boron with low yield. Lack of reliable liquor utilization method, havegreater impact on environment and other disadvantages.Source:http://www.mhcmp.com
The,production,boron,chemicals