Kev Tshawb Fawb Txog Cov Qauv Zoo thiab Kev Tshawb Fawb Txog Kev Sodium Cyanide

I. Basic Properties thiab Applications of Sodium Cyanide

Sodium cyanide (NaCN) yog ib qho khoom siv tshuaj inorganic tseem ceeb, uas siv dav hauv cov teb xws li metallurgy, electroplating, pharmaceuticals, thiab organic synthesis. Nws cov khoom ntshiab yog nyob rau hauv daim ntawv ntawm cov khoom dawb crystalline lossis hmoov, uas yog soluble heev hauv dej thiab muaj zog lom thiab corrosiveness. Vim yog qhov lom heev ntawm Sodium Cyanide , nws cov txheej txheem Tswj Xyuas Zoo thiab kev kuaj pom muaj feem cuam tshuam ncaj qha rau kev nyab xeeb ntawm kev tsim khoom, Kev Tiv Thaiv Ib puag ncig , thiab kev noj qab haus huv ntawm tib neeg.

II. Cov Txheej Txheem Zoo ntawm Sodium Cyanide

1.National Standards (GB)

Cov Txheej Txheem Zoo tam sim no rau sodium cyanide hauv Suav teb feem ntau yog raws li "GB / T 19306-2003 Industrial Sodium Cyanide". Cov txheej txheem no qhia txog cov kev cai lij choj, cov txheej txheem sim, cov cai tshuaj xyuas, thiab cov lus qhia ntim khoom, khaws cia, thiab kev thauj mus los rau qib kev lag luam Sodium cyanide . Cov cim qhia tshwj xeeb yog raws li nram no:

Cov ntsiab lus tseem ceeb (Xaiv li NaCN): ≥ 98.0% (Qib Zoo), ≥ 97.0% (Qib Ib)

• Sodium Hydroxide (NaOH): ≤ 0.5%

• Sodium Carbonate (Na₂CO₃): ≤ 1.0%

• Cov hlau hnyav (Xam li Pb): ≤ 0.002%

• Insoluble Matter hauv dej: ≤ 0.05%

2.Industry Standards thiab International Specifications

• Cov qauv kev lag luam hauv kev lag luam metallurgy (xws li YS / T 53-2020) muab cov kev xav tau siab dua rau cov ntsiab lus purity thiab impurity ntawm sodium cyanide, uas muaj feem xyuam rau cov xwm txheej tshwj xeeb xws li kev rho tawm kub.

• Cov txheej txheem thoob ntiaj teb (xws li ISO 14649) qhia txog kev tshawb nrhiav kom pom tseeb thiab kev tsom xam impurity ntawm sodium cyanide kom tau raws li cov kev xav tau ntawm high-end manufacturing.

III. Txoj Kev Tshawb Pom Tseem Ceeb ntawm Sodium Cyanide

1. Cov txheej txheem tshuaj ntsuam xyuas

• Silver Nitrate Titration Method (Kev Txiav Txim Siab):

Siv qhov tsim kom ruaj khov Ag(CN)₂⁻ complex ntawm Ag⁺ thiab CN⁻. Titrate nrog ib tug silver nitrate txheem tov thiab siv poov tshuaj iodide ua ib qho qhia. Thaum kawg taw tes, nyiaj iodide nag lossis daus yog tsim.

Reaction Formula: AgNO₃ + 2NaCN → Na[Ag(CN)₂] + NaNO₃

• Acid-Base Titration Method:

Nws yog siv los txiav txim siab cov ntsiab lus ntawm sodium hydroxide. Siv phenolphthalein ua qhov taw qhia thiab titrate nrog cov tshuaj hydrochloric acid txheem.

2.Instrumental Analysis Methods

• Ion Chromatography (IC):

Cais CN⁻ los ntawm ib qho kev sib pauv anion thiab ua tiav qhov kev tshawb pom muaj txiaj ntsig zoo hauv kev ua ke nrog cov khoom siv hluav taws xob, uas tsim nyog rau kev txheeb xyuas cov kab mob cyanide.

• Spectrophotometric:

Raws li cov tshuaj tiv thaiv ntawm cyanide thiab tus neeg sawv cev chromogenic (xws li isonicotinic acid-pyrazolone) los tsim cov xim xiav, thiab txiav txim siab cov ntsiab lus los ntawm kev ntsuas absorbance.

• Atomic Absorption Spectrometry (AAS):

Ntes hnyav hlau impurities (xws li Pb, Cu) thiab ua tiav ppm-theem precision siv nplaim taws lossis graphite furnace atomization tshuab.

3.Lwm yam khoom kuaj

• Kev txiav txim siab noo noo: Siv Karl Fischer txoj kev lossis qhov poob ntawm txoj kev ziab.

• Particle Size Analysis: Siv txoj kev laser diffraction los yog txoj kev sieving.

IV. Cov txheej txheem tshawb nrhiav thiab cov ntsiab lus tseem ceeb ntawm Kev Tswj Xyuas Zoo

1.Sample tuav

• Sodium cyanide yog hygroscopic heev. Thaum ua piv txwv, siv lub thawv qhuav thiab khaws cia rau hauv qhov chaw kaw kom tsis txhob muaj kev cuam tshuam cuam tshuam rau kev tshawb pom.

• Rau cov qauv tshuaj lom heev, kev ua haujlwm yuav tsum tau ua nyob rau hauv lub hood fume, thiab hnav cov khoom tiv thaiv (xws li lub npog ntsej muag roj thiab hnab looj tes).

2.Txoj kev cuam tshuam thiab kev daws teeb meem

• Kev Cuam Tshuam ntawm Sulfide: Ntxiv hydrogen peroxide kom tshem tawm cov kev cuam tshuam ntawm S²⁻.

• Ib puag ncig acidic: Ua ntej kuaj pom, kho pH ntawm cov tshuaj kom txog qib alkaline (pH > 11) kom tiv thaiv kev ua kom HCN tsis yaj.

3. Kev Tswj Xyuas Zoo

• Calibrate cov cuab yeej (xws li ion chromatographs thiab sib npaug) tsis tu ncua.

• Siv cov ntaub ntawv pov thawj (CRM) rau kev txheeb xyuas rov qab (yuav tsum yog 95%-105%).

• Kev txiav txim siab ob tus neeg sib luag, thiab qhov sib txawv ntawm qhov yuav tsum yog ≤ 0.3%.

V. Kev tiv thaiv kev nyab xeeb thiab kev tiv thaiv ib puag ncig

1. Kev ua haujlwm Specifications

• Cov tshuaj sodium cyanide yuav tsum tau muab cia rau hauv qhov chaw tsaus kom tsis txhob decomposition ntawm HCN roj vim lub teeb.

• Rau kev kho cov kua dej pov tseg, ntxiv ntau ntau ntawm sodium hypochlorite lossis hydrogen peroxide kom oxidize thiab decompose cov cyanide kom muaj kev nyab xeeb (CN⁻ ≤ 0.5 mg / L).

2. Ua raws li kev cai

• Raws li "Txoj Cai Tswjfwm Kev Nyab Xeeb Kev Nyab Xeeb Kev Nyab Xeeb Kev Nyab Xeeb" hauv Suav teb, "Tsib Doubles" kev tswj hwm kev tswj hwm (ob tus neeg tau txais thiab xa tawm, kev saib xyuas ob tus neeg, thiab lwm yam) yuav tsum tau siv rau sodium cyanide.

• Lub chaw kuaj xyuas yuav tsum dhau CMA daim ntawv pov thawj kom ntseeg tau tias cov ntaub ntawv muaj txiaj ntsig zoo.

VI. Kev Txhim Kho Yav Tom Ntej

1. Kev Siv Tshuab Tshawb Nrhiav Tsis Siv Neeg: Muab kev siv online ze-infrared spectroscopy (NIR) nrog kev kawm tshuab kom ua tiav kev saib xyuas lub sijhawm tiag tiag ntawm cov txheej txheem tsim khoom.

2. Cov Txheej Txheem Tshawb Nrhiav Ntsuab: Tsim ib txoj kev titration ntsev uas tsis muaj mercury los txo cov pa phem rau ib puag ncig.

3. Kev Siv Tshuab Tshawb Fawb Txog Qhov Trace: Ultra-high performance liquid chromatography-mass spectrometry (UHPLC-MS) siv rau kev tshawb nrhiav qhov tsis huv ntawm ppb.

xaus

Kev tswj xyuas qhov zoo ntawm sodium cyanide yog qhov txuas tseem ceeb kom ntseeg tau tias nws siv tau zoo. Los ntawm cov txheej txheem kuaj xyuas tus qauv thiab cov txheej txheem tswj xyuas zoo nruj, kev pheej hmoo ntawm kev tsim khoom tuaj yeem txo qis tau zoo, thiab kev lag luam tuaj yeem txhawb nqa kom txhim kho mus rau hauv kev coj ntsuab thiab ntse. Yav tom ntej, nrog rau kev tsim kho tshiab ntawm cov thev naus laus zis kuaj xyuas, cov qauv zoo ntawm sodium cyanide yuav raug txhim kho ntxiv, muab kev txhawb nqa txhim khu kev qha rau kev tsim khoom siab.