If knew the method of off-gas treatment of industry of of all kinds heavy metal, reducing processing cost from now on is not to ask

Go up an article is medium small the 10 big technological process that invented everybody to introduce industrial off-gas treatment, can small today making up also is to gave everybody to bring industrial industry off-gas treatment to compare practical content, that is the method of metallic industry off-gas treatment, hope to be able to be helped somewhat to everybody.

　　Condensation law:

Suit to purify reclaim mercuric vapour of tall pH indicator, often serve as absorb law and adsorptive law to purify mercuric steam pre-treatment.

　　 Absorb a law:

Potassium permanganate solution absorbs a law – the vapour containing mercury that applies to factory of appearance electric equipment;

Solution of natrium of second chloric acid absorbs a law – apply to processing chloric alkaline factory contains mercuric standard mercury is hydric;

Vitriolic – pyrolusite absorbs a law – apply to processing refine mercury tail gas and the vapour that contain mercury;

Ammoniac fluid absorbs a law to apply to what chloridize mercury produces waste gas to purify;

Chloridize law handles mercuric vapour.

　　 Adsorptive law:

Fill law of adsorption of chloric activated carbon to apply to; of the off-gas treatment that contain mercury

Law of activated carbon adsorption applies to what chloric ethylene synthesizes mercury of the chloridize in gas to purify;

Digest adsorptive law to apply to the processing of mercury fulminate.

　　Combustion law

Apply to coal fired power plant to contain the processing of mercuric flue gas. Use boiler of circular fluid-bed coal fired, cast in combustion process add limestone, flue gas uses report to remove dust or bag remove dust purify.

　　 Lead reachs its compound off-gas treatment

Lead and its compound waste gas suit to use absorb a law to handle.

Acerbity fluid absorbs a law to apply to the flue gas containing lead of the generation in purifying oxidation lead and accumulator production, usable also Yu Jing changes what what produce when fused lead to contain plumbic flue gas.

The proposal adopts 2 class to purify craft: The first class uses bag colander eliminate bigger grain; The 2nd class uses chemistry to absorb. Absorbefacient uses acetic acid commonly.

Lye absorbs a law to apply to those who purify generation of the boiler that change lead, smelting furnace to contain plumbic flue gas. Absorbefacient employs NaOH solution commonly.

　 Arsenic, chromic, cadmium reachs its compound off-gas treatment

| Arsenic, chromic, cadmium and its compound waste gas are used normally absorb law and filter law processing.

| The flue gas that contain arsenic should use condensation (200 degrees the following) – remove dust (bag dust catcher) – milk of lime absorbs a law to handle technology

| Chromic, cadmium and appropriate of its compound waste gas use bag type dust catcher to filter processing (wind speed is less than 1m/min)

A few kinds of heavy metal are endangered

Heavy metal waste gas basically originates of the generation in the industry such as coloured smelt, electric power, chemical industry, machining contain mercury, contain lead, contain arsenic to wait reach its compound waste gas, the heavy metal in coloured smelt industry has exceeded the heavy metal discharge capacity of liquid waste through the discharge capacity of waste gas, the health of serious minatory environment and mankind.

Copper (Cu) : The noxiousness of metallic copper is very small, but cupreous compound can be caused toxic. The 100~150 that exceeds human body to need a capacity when the copper inside human body times when can bring about anaemia of sex of necrotic sex hepatitis, hemolysis to wait for a symptom. Clinical research discovers copper of serum of patient of a lot of cancer is apparent grow in quantity, serum copper orchid albumen increases.

To spraying for insecticide with bluestone worker of grapy establish garden undertakes liver is injured sampling in detail investigating discovering these people are existing generally. And the cupreous preparation that takes larger dose by accident can cause function of salivate, disgusting, vomiting, hemolysis, yellow subcutaneous ulcer, kidney instantly exhaustion and central nervous system are restrained wait for toxic symptom.

Lead (Pb) : Lead can enter human body through respiratory tract and enteron, long-term contact chroma is in the lead of 50mg/L above, meet toxic. Lead to the whole body each organ all has harm effect, but it is with neurological, blood and cardiovascular system very. Chronic and toxic the commonnest symptom is angina of anaemic, abdomen and hepatitis of lead poisoning sex. The plant is in the symptom of neurological respect neurasthenic send sexual neuritis with how, expression is nerve of hypophysis lead poisoning paralytic, serious person can produce disease of plumbic sex brain.

Zinc (Zn) : In the experiment shows the Gao Xin inside body can bring about blood, high density lipoprotein drops and hurried sends sclerosis of arterial congee appearance, zinc is exorbitant return profit at the happening with swollen cancer. Zinc is contained in soil of and other places of British north Cambria tall, swollen occurence rate of its cancer of the stomach and enteron place cancer is high also.

Industrial zinc is toxic can make the cancerous swollen occurence rate of all sorts of types elevatory, long-term small dose or short-term large dose expose Yu Xin in, can send urgent, chronic zinc toxic.

Iron (Fe) : Early oneself discovery contains researcher element of iron blood red is ad cool-headed disease is iron overmuch inside body ad cool-headed at splanchnic cause. Flower, the country such as the United States ever reported occurence rate of the lung cancer in iron ore worker is high, and taller than mortality of average person lung cancer 70% . Iron can make tumor cell mushroom.

Nickel (Ni) : Although the noxiousness of nickel is lesser, but have saving effect and it is carcinogen. Nickel is extremely easy in kidney, lienal, liver save up. Often contact nickel salt, the skin can produce the symptom such as eczema and dermatitis.

Chromic (Cr) : In chromic compound with 6 price chromium noxiousness is the strongest, tervalent chromic take second place, the noxiousness of diatomic chromium and chromic itself is very small. Chromic compound can pass enteron, respiratory tract, skin and mucous membrane to enter human body. Classics enteron enters human body to be able to cause disgusting, vomiting, abdominal pain, when also can causing respiratory tract of classics of cankerous ill; to enter human body, above all enroach on the upper respiratory tract, cause rhinitis, pharyngitis, bronchitic etc.

Mercury reachs its compound off-gas treatment

Mercury and its compound waste gas are general the processing technique is: Absorb a law, adsorptive law, condensation law and combustion law.

Condensation law appropriate is used at purifying to reclaim mercuric steam of tall pH indicator, can adopt often be pressed and pressurization two kinds of means, often serve as the pre-treatment that absorbs law and adsorptive law to purify mercuric steam.

　　Manufacture technology in the light of disparate industry, relatively mature absorption law processing technology has:

A) the steam containing mercury that potassium permanganate solution absorbs a law to apply to factory of processing appearance electric equipment, absorb fluid appropriate to be solution of 0.3% ～ 0.6%KMnO4 circularly, KMnO4 utilization rate is inferior, lv of take an examination absorbs the seasonable complement of fluid;

B) solution of natrium of second chloric acid absorbs a law to apply to processing chloric alkaline factory contains mercuric standard mercury is hydric, absorb fluid appropriate to be the mixture aqueous solution of NaCl and NaClO, this draws fluid source wide, but this technological process is complex, operation condition is controlled not easily;

C) vitriolic – pyrolusite absorbs a law to apply to processing refine mercury tail gas and the steam that contain mercury, absorb fluid to be vitriolic – the fluid hanging chaotic of pyrolusite;

D) chloridize law handles mercuric steam: Flue gas enters mercuric tower, as refluent as the HgCl2 solution that gush drenchs inside the tower catharsis, the mercuric steam in flue gas is oxidized to generate Hg2Cl2 to precipitate by HgCl2 solution, thereby will mercuric purify. Hg2Cl2 precipitation is virulent, in producing a course, need to strengthen management and operation.

Fill appropriate of law of adsorption of chloric activated carbon to be used at containing mercuric off-gas treatment. Activated carbon layer needs to be filled beforehand chloric, the steam that contain mercury needs to remove dust beforehand, the Cl2 reaction of mercury and activated carbon surface generates HgCl2, achieve the goal that divide mercury.

Combustion law appropriate is used at coal fired power plant to contain the processing of mercuric flue gas. Use boiler of circular fluid-bed coal fired, cast in combustion process add limestone, flue gas uses electric dust catcher or bag dust catcher is purified.

　 The compound with mercuric pilot of the key in waste gas includes chloridize mercury and fulminate.

A) law appropriate uses activated carbon adsorption at chloric ethylene to synthesize mercury of the chloridize in gas purify;

B) ammoniac fluid absorbs law appropriate to be purified with what produce waste gas at chloridize mercury;

C) the processing that digests adsorptive law appropriate to be used at mercury fulminate.