CN105195104A - Adsorbing agent capable of purifying car exhaust - Google Patents

Abstract

The invention discloses an adsorbing agent capable of purifying car exhaust. The adsorbing agent is prepared from, by weight, 40-50 parts of fly ash, 4-5 parts of ferric nitrate, 3-4 parts of manganese acetate, 13-15 parts of glass fibers, 5-7 parts of sodium silicate, 5-6 parts of basalt fibers, 4-5 parts of polyacrylonitrile, 3-4 parts of ammonium fluosilicate, 0.3-0.5 part of boric ester coupling agents and an appropriate amount of deionized water. The adsorbing agent has the advantages of being simple in preparation process, low in production cost, high in adsorbing speed, good in effect and the like, is applied to car exhaust purification and has the better application prospect.

Description

A kind of can the adsorbent of purifying automobile tail gas

Technical field

The present invention relates to technical field of absorbent, particularly relate to a kind of can the adsorbent of purifying automobile tail gas.

Background technology

In recent years, the metallic element that coal produces in combustion causes the concern of various circles of society, and these metallic elements to be discharged into after in air and can to cause very large impact to environment, and mercury is exactly wherein one of poisonous metal.Mercury element have in vivo with the character of continuous enrichment in food chain, the injury that can not be cured for a long time can be caused to the nervous system of human body, in daily industrial production, smelting industry, Chi Kuang exploitation, manufacture of cement, biomass combustion, fired coal combustion etc. all can produce a certain amount of mercury emissions in air, and wherein fire coal is pollution sources maximum at present.In order to solve day by day serious coal-fired flue-gas mercury pollution problem, people are devoted to develop many effective catalyst, flue active carbon spraying technique is a kind of ideal technology, owing to having higher adsorption effect, all use in many power plant, but due to active carbon expensive, limit large-scale application, especially as the developing country China, more need a kind of cost-effective adsorbent to replace active carbon.

A certain amount of unburned carbon is had in flyash, content is generally between 2% to 12%, at present, in order to control the discharge of nitrogen oxide, many coal-burning power plants use low NO to meet the emissions requirements of nitrogen oxide, hypothermia and hypoxia condition in low nitrogen burning makes the phosphorus content in flyash obviously increase, and the phosphorus content of flyash is even increased to 20% even higher.The unburned carbon of flyash has certain adsorption capacity to Elemental Mercury, replaces the active carbon mercury adsorbed in flue gas to can yet be regarded as a kind of economically viable method with the unburned carbon in flyash.The abundant adsorption and oxidation of metallic element to mercury contained in flyash also has certain effect.Flyash has certain adsorption capacity to pollutant, but adsorption effect is often not ideal enough, in order to make the absorption property of flyash be improved, carries out to flyash the emphasis that study on the modification is research.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provide a kind of can the adsorbent of purifying automobile tail gas.

The present invention is achieved by the following technical solutions:

Can the adsorbent of purifying automobile tail gas, be made up of the raw material of following weight portion: flyash 40-50, ferric nitrate 4-5, manganese acetate 3-4, glass fibre 13-15, sodium metasilicate 5-7, basalt fibre 5-6, polyacrylonitrile 4-5, ammonium fluosilicate 3-4, boric acid ester coupler 0.3-0.5, deionized water are appropriate;

Described a kind of can the adsorbent of purifying automobile tail gas, be made up of following concrete steps:

(1) flyash is spent deionized water for several times, then dry 4-5h under 120 ° of C in an oven, by the nitric acid dousing 2-3h of flyash by 2 times amount after cooling, water-bath 1h in the water-bath of 60 ° of C afterwards, spend deionized water again to neutral, dry for standby;

(2) deionized water dissolving of ferric nitrate and manganese acetate mixing 3-4 times amount is stirred, again flyash prepared by step (1) is added in mixed liquor, in magnetic stirring apparatus, heating is stirred to dry, then drier dry 3-4h under 120 ° of C is put into, finally be ground to thin, and put into Muffle furnace calcine 0.5-1h under 400-600 ° of C, cross 100 mesh sieves after cooling for subsequent use;

(3) wash after glass fibre being soaked 20min with the suds of 2 times amount, the hydrochloric acid drying rear use 10% soaks 30-40min under 50 ° of C, then spends deionized water and dries rear for subsequent use;

(4) by after glass chopped and basalt fibre, polyacrylonitrile, ammonium fluosilicate, boric acid ester coupler mixed grinding be uniformly dispersed, the solution that concentration is 40-60% is made by water-soluble for sodium metasilicate, mixture is added in sodium silicate aqueous solution and is heated to 50-60 ° of C and stirs formation slurry, be added in slurry by modified coal ash prepared by step (2) again, the spraying dry that stirs can obtain.

Advantage of the present invention is: fly ash grain smooth surface, comparatively coarse with acid oxidase rear surface, increase specific area, again after manganese and Fe2O3 doping, reunite on its surface, to mercury, there is good catalytic performance, flyash surface can be adsorbed on by mercury oxidation and firmly, and self also can be oxidized again, the activity of adsorbent is made to keep stable continuation to play suction-operated, flyash is also containing abundant metallic element, in the adsorption and oxidation of mercury, there is certain advantage, the present invention also selects resistant to elevated temperatures glass fibre to carry out modification increase specific area raising load effect, thus play the adsorptivity of sharpest edges, the glass fibre added not only has good controlling to the fine particle in flue gas, also there is good sulfur resistance, the basalt fibre added, polyacrylonitrile, ammonium fluosilicate can strengthen the weatherability of adsorbent, sun-resistant property, fire resistance and corrosion resistance, it is simple that the present invention has preparation process, production cost is low, the rate of adsorption is fast, the feature such as effective, for tail gas purification, there is good application prospect.

Detailed description of the invention

Can the adsorbent of purifying automobile tail gas, be made up of the raw material of following weight portion: flyash 40, ferric nitrate 4, manganese acetate 3, glass fibre 13, sodium metasilicate 5, basalt fibre 5, polyacrylonitrile 4, ammonium fluosilicate 3, boric acid ester coupler 0.3, deionized water are appropriate;

Described a kind of can the adsorbent of purifying automobile tail gas, be made up of following concrete steps:

(1) flyash is spent deionized water for several times, then dry 4h under 120 ° of C in an oven, by the nitric acid dousing 2h of flyash with 2 times amount after cooling, water-bath 1h in the water-bath of 60 ° of C afterwards, then spend deionized water to neutrality, dry for standby;

(2) ferric nitrate and manganese acetate mixing are stirred with the deionized water dissolving of 3 times amount, again flyash prepared by step (1) is added in mixed liquor, in magnetic stirring apparatus, heating is stirred to dry, then drier dry 3h under 120 ° of C is put into, finally be ground to thin, and put into Muffle furnace calcine 0.5h under 400 ° of C, cross 100 mesh sieves after cooling for subsequent use;

(3) wash after glass fibre being soaked 20min with the suds of 2 times amount, the hydrochloric acid drying rear use 10% soaks 30min under 50 ° of C, then spends deionized water and dries rear for subsequent use;

(4) by after glass chopped and basalt fibre, polyacrylonitrile, ammonium fluosilicate, boric acid ester coupler mixed grinding be uniformly dispersed, the solution that concentration is 40% is made by water-soluble for sodium metasilicate, mixture is added in sodium silicate aqueous solution and is heated to 50 ° of C and stirs formation slurry, be added in slurry by modified coal ash prepared by step (2) again, the spraying dry that stirs can obtain.

The adsorbent of preparation is used for demercuration performance grading experimental provision to test, simulated flue gas flow is 1L/min, import mercury concentration 3mg/m ³, air velocity is 34000h ^-1experiment condition under, the removal efficiency of mercury can reach 83%, and denitration rate can reach 37%.

Claims (2)

1. one kind can the adsorbent of purifying automobile tail gas, it is characterized in that, be made up of the raw material of following weight portion: flyash 40-50, ferric nitrate 4-5, manganese acetate 3-4, glass fibre 13-15, sodium metasilicate 5-7, basalt fibre 5-6, polyacrylonitrile 4-5, ammonium fluosilicate 3-4, boric acid ester coupler 0.3-0.5, deionized water are appropriate.

2. a kind of according to claim 1 can the adsorbent of purifying automobile tail gas, it is characterized in that, be made up of following concrete steps:

(1) flyash is spent deionized water for several times, then dry 4-5h under 120 ° of C in an oven, by the nitric acid dousing 2-3h of flyash by 2 times amount after cooling, water-bath 1h in the water-bath of 60 ° of C afterwards, spend deionized water again to neutral, dry for standby;

(2) deionized water dissolving of ferric nitrate and manganese acetate mixing 3-4 times amount is stirred, again flyash prepared by step (1) is added in mixed liquor, in magnetic stirring apparatus, heating is stirred to dry, then drier dry 3-4h under 120 ° of C is put into, finally be ground to thin, and put into Muffle furnace calcine 0.5-1h under 400-600 ° of C, cross 100 mesh sieves after cooling for subsequent use;

(3) wash after glass fibre being soaked 20min with the suds of 2 times amount, the hydrochloric acid drying rear use 10% soaks 30-40min under 50 ° of C, then spends deionized water and dries rear for subsequent use;

(4) by after glass chopped and basalt fibre, polyacrylonitrile, ammonium fluosilicate, boric acid ester coupler mixed grinding be uniformly dispersed, the solution that concentration is 40-60% is made by water-soluble for sodium metasilicate, mixture is added in sodium silicate aqueous solution and is heated to 50-60 ° of C and stirs formation slurry, be added in slurry by modified coal ash prepared by step (2) again, the spraying dry that stirs can obtain.