Use useless old hard alloy and useless tungsten goods to reclaim the environmental influence of tungsten and contaminative prevention and cure

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Summary: The article abandons old hard alloy and useless tungsten goods to reclaim to using the environmental influence of tungsten and contaminative prevention and cure undertook evaluating, put forward to pollute measure of prevention and cure and proposal. Useless old hard alloy and useless tungsten goods reclaim technological process graph uses tungsten useless old hard alloy and useless tungsten goods reclaim tungsten resource, can rise not only rare lack resource -- , the integrated utilization rate of tungsten, and can reduce useless old hard alloy and the pollution of the goods that abandon tungsten to the environment, accord with the demand that expands circular economy, social benefit, environment benefit and economic benefits are remarkable. The article uses useless old hard alloy and useless goods to reclaim in the introduction on the foundation of tungsten resource technological process, analysed the main pollution source of this project, undertook the environment affects an evaluation, put forward to pollute measure of prevention and cure and proposal. 1 times technological process and characteristic technological process abandon knock off art old hard alloy and useless tungsten goods reclaim reproduction craft by: Acid of → of precipitation of white tungsten of → of soak of roast → broken → decomposes → ammonia deliquescent → evaporates composition of to calcine of dry → of crystallization → APT. Will contain ～ of W85% , CO2% 8% , C 6% ～ the useless alloy makings of 8% , join Na2SO4 to be inside roast furnace by certain proportion roast, use 0# derv to warm up to roast temperature. After roast expects classics is broken, enter alkaline soak process, react type is: WO3+2NaOH=Na2WO4+H2O filters via alkaline soak receive solution of thick tungsten acerbity natrium, divide outside containing tungsten, still contain other foreign matter, through purifying precipitation white tungsten makes foreign matter separate, raise tungsten at the same time reclaim rate. Purify except miscellaneous in purify undertake inside groove, use solution of thick tungsten acerbity natrium vapour to heat secondhand above all, rejoin CaCl2 solution from white tungsten of man-made of the separate out in solution of tungsten acerbity natrium. React type is: Na2WO4+CaCl2=CaWO4 ↓ + 2NaCl decomposes groove in hydrochloric acid through purifying gotten CaWO4 (airtight model) in undertake decomposing, gotten tungsten sick at heart uses ionic water catharsis, take off the impurity in the acid that divide tungsten, the tungsten acid after size mixing is added in filling the tank diameter that has ammonia water. Subsequently, solution of tungsten acerbity ammonia sends to filter press to filter, ammonium solution sends depurative tungsten acid to evaporate crystallization, evaporate terminus is judged through controlling the proportion of crystallization mother liquor. Evaporate after the end, content of crystallization of tungsten acerbity ammonia is used a few go ionic water catharsis, eliminate dissociate ammonium and other foreign matter, again crystal fire of dry, forge becomes finished product 3 oxidation tungsten. React type is: Photograph of CaWO4 (solid) ↓ + 2HCl(fluid photograph) photograph of =H2WO4 (solid) ↓ + photograph of CaCl2 (fluid) if right plan institute is shown,H2WO4+2NH4OH=(NH4)2WO4+2H2O produces technological process. Craft characteristic abandons old hard alloy and useless tungsten goods to reclaim the craft of tungsten has the following advantage: Na2SO4 is joined in useless old hard alloy and the roast of the goods that abandon tungsten, be helpful for Na2WO4 generating, often can press alkaline dip, the soak that raises tungsten effectively reclaims rate. This craft can reclaim integratedly W, CaCl2 and ammonia, resource is integrated utilization rate is high. Main Yuan Fucai expects in reaching fuel craft, main Yuan Fucai expects include hydrochloric acid, ammonia water, juice alkaline, vitriolic natrium, chloridize is calcic; Roast fuel is 0# derv. Source of 2 main pollution and measure of prevention and cure are pressed produce per year through reclaiming 1, 000t 3 oxidation tungsten scale of production, reclaim the main pollution source that the process generates and measure of its prevention and cure are as follows. H-1 of · of M3 of tolerance of the smoke after source of waste gas pollution and SO2 of watch of measure of prevention and cure, soot arises and discharging a circumstance to express contaminative factor to handle pre-treatment produces concentration (Mg · M-3) produces an amount (Kg · H-1) discharges chroma (discharge capacity of Mg · M-3) (Kg · H-1)SO2953.

565.

4810.

54.

59 soot 4, 291.

0124.

3192.

481.

095, flue gas of boiler of coal fired of 663 boiler flue gas is used " in Wen Qiu - dust catcher of film of Ma Shi water " purify processing, remove dust efficiency is made an appointment with 95.

5% , desulphurization efficiency 15% , the flue gas after purifying processing is discharged through the chimney with tall 35m. SO2, soot arises and discharge circumstance rank right watch. Waste gas of fuel of roast flue gas. Flue gas of derv combustion generation is measured 2, 617m3/h, discharge 6h everyday. SO2 produces an amount 1.

11kg/h, generation chroma 424.

15mg/m3. Additional, 4kg soot arises about everyday in roast craft, plan to adopt do not become rusty key link hop-pocket dust catcher removes dust, remove dust efficiency 98% , collection dust and roast product enter alkaline dip process together, soot is discharged outside 0.

01kg/h. Melt pyrolysis produces SO2. According to engineering analysis, roast working procedure joins Na2SO4, na2SO4 produces SO2 to be 213kg/h in the pyrolysis below high temperature, generation chroma 81, 390.

9mg/m3. After changing Lin of gush of sodium lye loop to absorb through 2 class oxyhydrogen, total absorptivity can be achieved 99.

7% , SO2 discharges chroma 244.

6mg/m3, discharge capacity 0.

64kg/h, accord with " air pollution content discharges industrial furnace kiln standard " requirement of GB9078-1996 secondary standard. Roast working procedure is returned after the Na2SO4 that draws generation crystallizes via condensing or outside carry out. Contain acid of HCl waste gas to decompose working procedure HCl to volatilize the quantity is 82.

9t/a, generation chroma 1, 439.

2mg/m3. Can use SQ T-8 acerbity mist to purify tower processing, wind force 8, 000m3/h, purify a tower to handle efficiency 95% . Purify principle and effect: Waste gas enters a tower from tower bottom air inlet inside, counteract fluid to carry gush to drench from the tower the canal is ejective, pass rapid ball to update fluid face ceaselessly, make gas fluid is contacted adequately, pass multistage to change, achieve working result. Quantity of the platoon outside the HCl after purifying is 4.

15t/a, discharge chroma for 72.

5mg/m3, accord with " air pollution content discharges a standard integratedly " requirement of GB16297-1996 secondary standard. Contain ammonia of NH3 waste gas deliquescent working procedure. Ammonia is deliquescent in working procedure, to can make reaction complete, want to join the NH4OH of excessive normally. Classics computation, this working procedure volatilizes the NH3 of transgression is 18t/a. Evaporate crystallization working procedure. Evaporate crystallization working procedure is to use heat evaporate the unionized free ammonia in solution of eliminate tungsten acerbity ammonium and moisture. Classics computation, this working procedure volatilizes the NH3 of transgression is 79.

9t/a. To afore-mentioned ammonia gas uses condensation to absorb tower processing, of ammonia reclaim rate for 95% . Absorb principle and effect: Be in after ammoniac aerification encounter cold when be come down by condensation for the most part, the meeting when treating water is absorbed, become rare ammonia water. Collection ammonia water the elevatory meeting as temperature again aerification, the fall as temperature will condensation is absorbed. Achieve the ammonia when ℃ of 95 ～ 100 when temperature almost all aerification. The ammonia water purity that absorbs after aerification again is tall, but proper resorbent a few ammonia is angry, the ammonia water that makes turns into product line to use directly, chroma of reclaiming rare ammonia water can amount to 5 ～ 7 N. The tail gas after absorbing is accorded with " effluvial pollutant discharge standard " requirement of GB14554-93 secondary standard. Working procedure of orchid tungsten to calcine. To calcine of acerbity ammonium of wet intermediate tungsten produces orchid tungsten (WO3) working procedure, this working procedure undertakes inside to calcine furnace. Main contaminant is NH3 in tail gas of to calcine furnace, predicting NH3 is produced per year unripe 55.

7t/a, inside to calcine furnace the NH3 of 90% is decomposed for H2 and N2, the tail gas after decomposing is achieved " effluvial pollutant discharge standard " requirement of GB14554-93 secondary standard. Dilute changes working procedure to discharge NH3. Crystallization mother liquor changes working procedure to release NH3 about 0.

05t/a, the tail gas after changing is discharged by 35m chimney, lesser to environmental influence. The amount of manufacturing liquid waste that liquid waste pollutes source and measure of prevention and cure to answer knock off art originally is small, when basically white tungsten precipitation filters contain NaCl waste liquid, liquid waste is measured 6.

4m3/d; The useless acid of the generation after tungsten pickling washs and wash water; Acid decomposes the HCl that volatilizes in working procedure, after through SQ T-8 acid mist purifies a tower, have 0 everyday.

The drip washing water of 1m3 is discharged outside open circuit; Workshop sanitation rinses water, estimation is 2.

0m3/d. To afore-mentioned production liquid waste all introduces integrated liquid waste to handle a pool, effective cubage is 70m3, use at adjusting liquid waste quantity and water quality. Cast add limestone or waste water of production of other drug processing, can amount to mark to discharge. The solid trash that solid trash analyses this answering to receive technology basically has broken bits of dissolve of broken bits of boiler coal fired, alkaline dip broken bits, ammonia. Boiler broken bits produces per year crude capacity to make an appointment with 420t, for general solid trash, can use at paving a road to wait for recycle; Alkaline dip broken bits produces per year crude capacity to make an appointment with 232t, main component is Co, contain Co30% ～ 40% , can reclaim use; Content of 3 oxidation tungsten amounts to the filter broken bits after dissolve of ammonia of thick tungsten acerbity classics 8% ～ 10% , ammoniac dissolve broken bits need not make additive via handling supply steel ironworks, with refine wolfram steel, lesser to environmental influence. 3 epilogue abandon old hard alloy and useless tungsten goods to reclaim craft of 3 oxidation tungsten is reliable, practical strong, can realize tungsten resource reclaim again use, reduce the pollution of stock of useless old tungsten to the environment, of tungsten reclaim utilization rate can be amounted to 99.

7% , accord with the demand that expands circular economy. Produce per year with reclaiming by craft 1, 000t estimation of 3 oxidation tungsten, can realize gain 500 ～ 8 million yuan, create wealth for the society, offer obtain employment opportunity, economic benefits and environmental benefit, society benefit are distinct, belong to environmental protection project. Waste gas of flue gas of the roast in answering knock off art, HCl and technology of economy of measure of ammoniac gas processing are feasible, came true to amount to mark to discharge. The carriage that strengthens derv, ammonia water, hydrochloric acid according to measure of dangerous chemical government, keep in storage and use management. CNC Milling CNC Machining