CN101792184B - Method for comprehensively utilizing asbestos tailings - Google Patents
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- CN101792184B CN101792184B CN2010100455225A CN201010045522A CN101792184B CN 101792184 B CN101792184 B CN 101792184B CN 2010100455225 A CN2010100455225 A CN 2010100455225A CN 201010045522 A CN201010045522 A CN 201010045522A CN 101792184 B CN101792184 B CN 101792184B
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Abstract
The invention relates to a method for comprehensively utilizing asbestos tailings, and belongs to the technical fields of comprehensive utilization of non-metallic resources and resource recycling of solid wastes. The method comprises the following steps: 1, reacting the asbestos tailings with hydrochloric acid to give pickle liquor and acid leaching residue respectively; 2, reacting the pickle liquor prepared by step 1 with an oxidant first and then reacting with ammonia to give solid iron oxide red and filtrate of the step 2 respectively; 3, reacting the filtrate of the step 2 with the ammonia to give high purity solid magnesium hydroxide and filtrate of the step 3 respectively; and 4, fully mixing the acid leaching residue and iron oxide red with cokes to react fully at the temperature of between 2,200 and 2,500 DEG C to give fused magnesite in the upper layer and silicoferrite in the lower layer. Through the method, the high purity magnesium hydroxide and silicoferrite are prepared from the asbestos tailings; minerals are leached by using the hydrochloric acid, and the leaching ratio is high; and the transport link of the hydrochloric acid and the ammonia is avoided, solid wastes are not generated, the emission of the wastes is zero, and the environment is protected.
Description
One, technical field
The comprehensive utilization and the solid waste resource recovery that the present invention relates to nonmetal resource utilize technical field, are a kind of asbestos tailings comprehensive utilization method.
Two, background technology
Asbestos are aggregates of natural fiber shape mineral, can split to be divided into thin and flexible fiber.Difference by composition, structure generally is divided into chrystile (also claiming chrysotile), amphibole asbestos (alkaline amphibole asbestos also are referred to as corcidolite), brucite asbestos etc. with asbestos.Wherein chrystile output is maximum, and it is the widest to distribute, and accounts for ultimate production more than 98%.
Asbestos are one of human nonmetal mineral resources that utilize the earliest, and it has characteristics such as rub resistance, heat-resisting, anticorrosive, sound insulation and light weight, and this has also determined its multi-functional and wide Application Areas aspect industrial utilization.Asbestos products with asbestos production reaches thousands of kinds, is widely used in the modern industries such as building, machinery, oil, chemical industry, metallurgy, electric power, traffic and military project.Along with industrial expansion, the Application Areas of chrystile is constantly widened, and it and metal, ceramic fiber, graphite, spun glass etc. are processed various matrix materials, have been used for making the parts of spacecraft.Present owing to requirement on environmental protection, so countries in the world are all at the surrogate of studying asbestos.
At present, China whenever selects 1 ton of 3 to 5 grades of qualified asbestos in western asbestos producing region, need with 26 to 28 tons in asbestos ore, that is 1 ton of finished product cotton of every product will produce 25 to 27 tons of mine tailings.Mine of western (containing Qinghai Mang Ya, Xinjiang Ba Zhou, three ore deposits, Ruoqiang) and other places manufactures a finished product cotton about 300,000 tons every year, and annual newly-increased mine tailing is more than 7,500,000 tons.Simultaneously, this area's accumulation asbestos tailings has reached tens million of even more than one hundred million tons, and pile up like a mountain.Throughout the year wind are rainy few in these areas in addition, and cold dry, a year most frequent wind direction is a nor'wester, and the strong wind fate has 125-165 days, and general wind speed is at 17 meter per seconds-20 meter per second, and whenever the day of strong wind, asbestos dust soars, and very closely do not distinguish.The massif that has an area of tens kilometers all around all is a slices of vast expanse of whiteness, is all covered by asbestos dust.On the Gobi desert under the Altun, several the tens kilometers long mine tailing alluviation band of distributing makes these local very fragile originally vegetation all gone.It all is reticulattion (asbestosis) that cattle and sheep in 20 square kilometres are slaughtered back lung, and people's living environment is constituted a serious threat, and also serious threat has been arrived Altunshan Nature Reserve, the vegeto-animal safety in Tibetan antelope protective belt, HOh Xil.One of therefore, solving the asbestos tailings that pile up like a mountain is China western asbestos producing region, and even the significant challenge of whole west area environment protection.
About the comprehensive utilization technique of asbestos tailings, main method is following:
1, preparation MAGNESIUM METAL 99
Because asbestos tailings mainly is made up of serpentine, chemical ingredients mainly is Natural manganese dioxide and silicon-dioxide.As far back as 1967, people such as U.S. F.L.Pundsacl just adopted bicarbonate of ammonia that asbestos tailings is handled, and obtained products such as silicon-dioxide, magnesiumcarbonate.W.George etc. at first use hydrochloric acid leaching to asbestos tailings, after the filtration silicon are separated with magnesium, handle filtrating and filter residue respectively, obtain great specific surface area silica and magnesium salts at last.The mainstream technology energy consumption of external processing asbestos tailings is higher, and cost is higher, is in a predicament.
2, high efficiente callback fibrous magnesium silicate
Utilize fibrous magnesium silicate in water or in some chemical surface agent solutions, can expand; Apply certain external force and promptly can be changed into this principle of superfine fibrous magnesium silicate; The asbestos tailings of dry method selection by winnowing is loosened, and then reclaim the fibrous magnesium silicate that is met the asbestos products requirement with certain length-to-diameter ratio.Though this recovery technology can the recovery part asbestos product, improves economic benefit of enterprises effectively, can not reduce the asbestos tailings that influences environment, can't reach the main purpose of decontamination.
3, preparation material of construction
(1) adopting asbestos tailings is basic aggregate, and flyash is that tackiness agent production is non-burning brick, and the pressure-proof and snap-resistent intensity of its goods of experiment proof is far above No. 150 non-burning brick technical indicators; (2) mine tailing is pulverized, milled after the roasting under 700～1050 ℃ of high temperature again, moulding then, hydrothermal treatment consists are made materials for wall, heat preserving and insulating material and finishing material; (3) through feedstock production, found, prepared sytull such as moulding, annealing and crystallization; Its each item physical and chemical index all meets or exceeds like product; Its mechanical property, wear resistance and excellent anti-corrosion performance have excellent electric insulating and higher thermotolerance and lower thermal expansivity; (4) prepare heat resistance concrete and refractory materials with asbestos tailings; The characteristics of the main siliceous magnesium of this technology utilization asbestos tailings; Through batching, high-temperature calcination, mill, operation such as moulding, low temperature are synthetic, obtain above-mentioned refractory materials at last, the requirement that its quality product all is up to state standards.Use asbestos tailings to produce material of construction, can consume asbestos tailings in large quantities, solve the environmental problem that asbestos tailings pollutes effectively, have certain economic benefits simultaneously.But this type comprehensive utilization mode is failed the application that puts it over so far, and its reason mainly contains 3 points: (1) low temperature moulding prepares the asbestos tailings brick and tile, and the fibrous magnesium silicate in the mine tailing is failed modification, still has asbestos waste pollution problem of environment in the use; (2) use high-temperature calcination to prepare refractory materials, though changed the structure of asbestos fibre, eliminated the environmental threat of asbestos refuses, need to consume a large amount of fuel in producing, production cost is high, and profit is limited; (3) most asbestos mine has inconvenient traffic all in outlying mountain area, and transportation route is long, and the finished product selling price is low, and enterprise is difficult to earn a profit and keeps normal operation.
4, soda acid leaches
The main research of carrying out both at home and abroad all is to adopt hydrochloric acid, sulfuric acid or nitration mixture leaching asbestos tailings, or handles with yellow soda ash, bicarbonate of ammonia, produces magnesium salts, Natural manganese dioxide or magnesium metal.Propose of the processing of the later waste residue of magnesium, and then neutralize the preparation WHITE CARBON BLACK with acid through caustic soda.The shortcoming of flow process is that the acid and the caustic soda that add finally can not utilize, gets into waste water and discharges, and the formation secondary pollution, product Marinco H, magnesian quality product are wayward.Bronsted lowry acids and bases bronsted lowry is then bought through market, and transportation cost is bigger.
Three, summary of the invention
The invention provides a kind of asbestos tailings comprehensive utilization method, overcome the deficiency of above-mentioned prior art, it utilizes asbestos tailings to prepare high purity magnesium hydroxide and ferrosilicon, turns waste into wealth.
The present invention can also further overcome the transit link of hydrochloric acid and ammonia, realizes that no solid waste produces, do not have discharging wastes, environment amenable effect.
Technical scheme of the present invention realizes through following measure: a kind of asbestos tailings comprehensive utilization method, and it is undertaken by following step:
The first step after fully reacting under the normal pressure, 80 ℃ to 110 ℃, is filtered asbestos tailings and hydrochloric acid to obtain pickling liquor and acid leaching residue respectively;
Second step; Pickling liquor that earlier the first step is obtained and oxygenant carry out sufficient oxidizing reaction makes ferrous iron wherein become ferric iron; React under normal pressure, 50 ℃ to 90 ℃ with 5% to 10% ammoniacal liquor then; When pH value to 7 stopped reaction to 8 time, obtain the solid iron oxide red and the second step filtrating respectively through filtering;
The 3rd step was with the above-mentioned second step filtrating and 10% to 20% ammoniacal liquor at normal pressure, 50 ℃ to 90 ℃, pH value 10 to 11 time fully after the reaction, filtered to obtain the solid high purity magnesium hydroxide respectively and the 3rd step filtrated;
The 4th step was that electrosmelted magnesite clinker, lower floor are ferrosilicon with obtaining the upper strata 2200 ℃ to 2500 ℃ abundant down reactions behind above-mentioned acid leaching residue and iron oxide red and the coke thorough mixing.
Be to the further optimization of one of foregoing invention technical scheme below or/and improve:
Above-mentioned the 3rd step filtrating is added the Natural manganese dioxide ammonia still process reaction of seething with excitement; Obtain the ammonia and the liquid of steam state respectively, the ammonia of steam state is through condensation and to be mixed with concentration be that 5% to 10% ammoniacal liquor is used for above-mentioned second step or/and 10% to 20% ammoniacal liquor is used for above-mentioned the 3rd step.
The liquid that above-mentioned boiling ammonia still process reaction is obtained carries out the thermal degradation reaction and obtains solid oxidation magnesium and liquid hydrochloric acid respectively in closed reactor, and solid oxidation magnesium is used for above-mentioned boiling ammonia still process reacts, and liquid hydrochloric acid is used for the above-mentioned the first step.
The temperature of reaction of above-mentioned decomposition reaction is 800 ℃ to 900 ℃.
It is to be used for the above-mentioned the first step behind 15% to 22% the hydrochloric acid that aforesaid liquid hydrochloric acid is mixed with concentration, and 50 ℃ to 90 ℃ of the temperature of reaction of the first step, reaction times are 1 hour to 2 hours.
Above-mentioned oxygenant is ydrogen peroxide 50 or the oxygen or the air of 30% concentration, and oxidizing reaction temperature is 50 ℃ to 90 ℃.
Above-mentioned asbestos tailings contains silicon-dioxide 32% to 42%, red oxide of iron and red stone 7% to 12%, Natural manganese dioxide 36% to 42%; Asbestos tailings is used further in the first step after being crushed to 80 order to 100 orders.
Above-mentioned asbestos tailings comprehensive utilization method is undertaken by following step:
The first step is 15% to 22% hydrochloric acid with asbestos tailings and concentration under normal pressure, 80 ℃ to 110 ℃, carry out 1 hour to 2 hours reaction after, filter and obtain pickling liquor and acid leaching residue respectively;
Second step; Pickling liquor that earlier the first step is obtained and oxygenant carry out sufficient oxidizing reaction makes ferrous iron wherein become ferric iron; React under normal pressure, 50 ℃ to 90 ℃ with 5% to 10% ammoniacal liquor then; When pH value to 7 stopped reaction to 8 time, obtain the solid iron oxide red and the second step filtrating respectively through filtering;
In the 3rd step, the above-mentioned second step filtrating and 10% to 20% ammoniacal liquor after normal pressure, 50 ℃ to 90 ℃, pH value are reaction in 10 to 11 times 1 hour to 2 hours, are filtered and obtain the solid high purity magnesium hydroxide respectively and the 3rd step filtrated;
The 4th step was that electrosmelted magnesite clinker, lower floor are ferrosilicon with obtaining the upper strata 2200 ℃ to 2500 ℃ reactions in following 1 hour to 2 hours behind above-mentioned acid leaching residue and iron oxide red and the coke thorough mixing.
The 5th step, will be above-mentioned the 3rd step filtrating add the Natural manganese dioxide ammonia still process reaction of seething with excitement, 105 ℃ to 120 ℃ of the ammonia still process temperature of reaction of seething with excitement, reaction pressure 0.05Mpa to 0.22Mpa, reaction times are 1 hour to 2 hours, obtain the ammonia and the liquid of steam state respectively; The ammonia of steam state is through condensation and to be mixed with concentration be that 5% to 10% ammoniacal liquor is used for above-mentioned second step or/and 10% to 20% ammoniacal liquor is used for above-mentioned the 3rd step;
The 6th step; The liquid that above-mentioned boiling ammonia still process reaction obtains is proceeded after the evaporation concentration in closed reactor and under 800 ℃ to 900 ℃ of normal pressures, temperature of reaction, carries out the thermal degradation reaction to obtain solid oxidation magnesium and liquid hydrochloric acid respectively; And solid oxidation magnesium is used for above-mentioned boiling ammonia still process reaction, liquid hydrochloric acid is used for the above-mentioned the first step.
In the present invention: % is that per-cent all is mass percent.
The present invention utilizes asbestos tailings to prepare high purity magnesium hydroxide and ferrosilicon; Utilize hydrochloric acid to leach mineral; Its leaching yield is higher, can also further overcome the transit link of hydrochloric acid and ammonia, realizes that no solid waste produces, do not have discharging wastes, environment amenable effect.
Four, description of drawings
Accompanying drawing 1 is the schema of most preferred embodiment of the present invention.
Accompanying drawing 2 is for utilizing the XRD spectra of gained major product Marinco H of the present invention.
Five, embodiment
The present invention does not receive the restriction of following embodiment, can confirm concrete embodiment according to technical scheme of the present invention and practical situation.
Below in conjunction with most preferred embodiment and accompanying drawing the present invention is further described:
Embodiment 1, and the method for this cotton comprehensive utilization of tailing is undertaken by following step:
The first step after fully reacting under the normal pressure, 80 ℃ to 110 ℃, is filtered asbestos tailings and hydrochloric acid to obtain pickling liquor and acid leaching residue respectively;
Second step; Pickling liquor that earlier the first step is obtained and oxygenant carry out sufficient oxidizing reaction makes ferrous iron wherein become ferric iron; React under normal pressure, 50 ℃ to 90 ℃ with 5% to 10% ammoniacal liquor then; When pH value to 7 stopped reaction to 8 time, obtain the solid iron oxide red and the second step filtrating respectively through filtering;
The 3rd step was with the above-mentioned second step filtrating and 10% to 20% ammoniacal liquor at normal pressure, 50 ℃ to 90 ℃, pH value 10 to 11 time fully after the reaction, filtered to obtain the solid high purity magnesium hydroxide respectively and the 3rd step filtrated;
The 4th step was that electrosmelted magnesite clinker, lower floor are ferrosilicon with obtaining the upper strata 2200 ℃ to 2500 ℃ abundant down reactions behind above-mentioned acid leaching residue and iron oxide red and the coke thorough mixing.
Embodiment 2, and the method for this cotton comprehensive utilization of tailing is undertaken by following step:
The first step after fully reacting under the normal pressure, 80 ℃ or 110 ℃, is filtered asbestos tailings and hydrochloric acid to obtain pickling liquor and acid leaching residue respectively;
Second step; Pickling liquor that earlier the first step is obtained and oxygenant carry out sufficient oxidizing reaction makes ferrous iron wherein become ferric iron; React under normal pressure, 50 ℃ or 90 ℃ with 5% or 10% ammoniacal liquor then; Stopped reaction when pH value to 7 or 8 obtains the solid iron oxide red and the second step filtrating respectively through filtering;
The 3rd step was with the above-mentioned second step filtrating and 10% or 20% ammoniacal liquor in normal pressure, 50 ℃ or 90 ℃, pH value 10 or 11 time fully after the reaction, filtered to obtain the solid high purity magnesium hydroxide respectively and the 3rd step filtrated;
The 4th step was that electrosmelted magnesite clinker, lower floor are ferrosilicon with descending fully reaction to obtain the upper strata at 2200 ℃ or 2500 ℃ behind above-mentioned acid leaching residue and iron oxide red and the coke thorough mixing.
In the foregoing description 1 to 2, can do according to actual needs further to optimize or/and select:
Above-mentioned the 3rd step filtrating is added the Natural manganese dioxide ammonia still process reaction of seething with excitement; Obtain the ammonia and the liquid of steam state respectively, the ammoniacal liquor that the ammonia of steam state is through condensation and be mixed with that concentration be 5% or 10% ammoniacal liquor of (perhaps 5% to 10%) is used for above-mentioned second step or/and 10% or 20% (perhaps 10% to 20%) is used for above-mentioned the 3rd step.
The liquid that above-mentioned boiling ammonia still process reaction is obtained carries out the thermal degradation reaction and obtains solid oxidation magnesium and liquid hydrochloric acid respectively in closed reactor, and solid oxidation magnesium is used for above-mentioned boiling ammonia still process reacts, and liquid hydrochloric acid is used for the above-mentioned the first step.
The temperature of reaction of above-mentioned decomposition reaction is 800 ℃ or 900 ℃ (perhaps 800 ℃ to 900 ℃).
Be used for the above-mentioned the first step after aforesaid liquid hydrochloric acid is mixed with concentration be 15% or 22% hydrochloric acid of (perhaps 15% to 22%), and the temperature of reaction of the first step 50 ℃ or 90 ℃ (perhaps 50 ℃ to 90 ℃), reaction times are 1 hour or 2 hours (perhaps 1 hour to 2 hours).
Oxygenant in second step is ydrogen peroxide 50 or the oxygen or the air of 30% concentration, and oxidizing reaction temperature is 50 ℃ or 90 ℃ (perhaps 50 ℃ to 90 ℃).
Asbestos tailings in the first step contains silicon-dioxide 32% or 42% (perhaps 32% to 42%), red oxide of iron and red stone 7% or 12% (perhaps 7% to 12%), Natural manganese dioxide 36% or 42% (perhaps 36% to 42%); Asbestos tailings is used further in the first step after being crushed to 80 orders or 100 orders (perhaps 80 order to 100 orders).
In the present invention: % is that per-cent all is mass percent.
Above technical characterictic has constituted most preferred embodiment of the present invention, and it has stronger flexibility and best implementation result, can increase and decrease non-essential technical characterictic according to actual needs, satisfies the demand of different situations.
Most preferred embodiment of the present invention utilizes asbestos tailings to prepare high purity magnesium hydroxide and ferrosilicon, utilizes hydrochloric acid to leach mineral, and its leaching yield is higher than sulfuric acid; And produce electrosmelted magnesite clinker and ferrosilicon simultaneously; The ammonia of its technological process and hydrochloric acid all carry out on-site prepn, and the ammonium chloride of generation decomposes ammonification on the spot and hydrochloric acid recycles; This can overcome the transit link of hydrochloric acid and ammonia, and does not have the solid waste generation.
Claims (9)
1. asbestos tailings comprehensive utilization method is characterized in that being undertaken by following step:
The first step after fully reacting under the normal pressure, 80 ℃ to 110 ℃, is filtered asbestos tailings and hydrochloric acid to obtain pickling liquor and acid leaching residue respectively;
Second step; Pickling liquor that earlier the first step is obtained and oxygenant carry out sufficient oxidizing reaction makes ferrous iron wherein become ferric iron; React under normal pressure, 50 ℃ to 90 ℃ with the ammoniacal liquor of 5 % to 10% then; When pH value to 7 stopped reaction to 8 time, obtain the solid iron oxide red and the second step filtrating respectively through filtering;
The 3rd step was with the above-mentioned second step filtrating and 10% to 20% ammoniacal liquor at normal pressure, 50 ℃ to 90 ℃, pH value 10 to 11 time fully after the reaction, filtered to obtain the solid high purity magnesium hydroxide respectively and the 3rd step filtrated;
The 4th step was that electrosmelted magnesite clinker, lower floor are ferrosilicon with obtaining the upper strata 2200 ℃ to 2500 ℃ abundant down reactions behind above-mentioned acid leaching residue and iron oxide red and the coke thorough mixing;
Wherein: above-mentioned the 3rd step filtrating is added the Natural manganese dioxide ammonia still process reaction of seething with excitement; Obtain the ammonia and the liquid of steam state respectively, the ammonia of steam state is through condensation and to be mixed with concentration be that 5% to 10% ammoniacal liquor is used for above-mentioned second step or/and 10% to 20% ammoniacal liquor is used for above-mentioned the 3rd step.
2. asbestos tailings comprehensive utilization method according to claim 1; It is characterized in that the liquid that above-mentioned boiling ammonia still process reaction obtains is carried out the thermal degradation reaction obtains solid oxidation magnesium and liquid hydrochloric acid respectively in closed reactor; And solid oxidation magnesium is used for above-mentioned boiling ammonia still process reaction, liquid hydrochloric acid is used for the above-mentioned the first step.
3. asbestos tailings comprehensive utilization method according to claim 2, the temperature of reaction that it is characterized in that above-mentioned decomposition reaction are 800 ℃ to 900 ℃.
4. asbestos tailings comprehensive utilization method according to claim 2; It is characterized in that it is to be used for the above-mentioned the first step behind 15% to 22% the hydrochloric acid that aforesaid liquid hydrochloric acid is mixed with concentration, and 90 ℃ of the temperature of reaction of the first step, reaction times are 1 hour to 2 hours.
5. according to claim 1 or 2 or 3 or 4 described asbestos tailings comprehensive utilization method, it is characterized in that oxygenant is ydrogen peroxide 50 or the oxygen or the air of 30% concentration, oxidizing reaction temperature is 50 ℃ to 90 ℃.
6. according to claim 1 or 2 or 3 or 4 described asbestos tailings comprehensive utilization method, it is characterized in that asbestos tailings contains silicon-dioxide 32% to 42%, red oxide of iron 7% to 12%, Natural manganese dioxide 36% to 42%; Asbestos tailings is used further in the first step after being crushed to 80 order to 100 orders.
7. asbestos tailings comprehensive utilization method according to claim 5 is characterized in that asbestos tailings contains silicon-dioxide 32% to 42%, red oxide of iron 7% to 12%, Natural manganese dioxide 36% to 42%; Asbestos tailings is used further in the first step after being crushed to 80 order to 100 orders.
8. according to claim 1 or 2 or 3 or 4 described asbestos tailings comprehensive utilization method, it is characterized in that being undertaken by following step:
The first step is 15% to 22% hydrochloric acid with asbestos tailings and concentration under normal pressure, 80 ℃ to 110 ℃, carry out 1 hour to 2 hours reaction after, filter and obtain pickling liquor and acid leaching residue respectively;
Second step; Pickling liquor that earlier the first step is obtained and oxygenant carry out sufficient oxidizing reaction makes ferrous iron wherein become ferric iron; React under normal pressure, 50 ℃ to 90 ℃ with the ammoniacal liquor of 5 % to 10% then; When pH value to 7 stopped reaction to 8 time, obtain the solid iron oxide red and the second step filtrating respectively through filtering;
In the 3rd step, the above-mentioned second step filtrating and 10% to 20% ammoniacal liquor after normal pressure, 50 ℃ to 90 ℃, pH value are reaction in 10 to 11 times 1 hour to 2 hours, are filtered and obtain the solid high purity magnesium hydroxide respectively and the 3rd step filtrated;
The 4th step was that electrosmelted magnesite clinker, lower floor are ferrosilicon with obtaining the upper strata 2200 ℃ to 2500 ℃ reactions in following 1 hour to 2 hours behind above-mentioned acid leaching residue and iron oxide red and the coke thorough mixing;
The 5th step, will be above-mentioned the 3rd step filtrating add the Natural manganese dioxide ammonia still process reaction of seething with excitement, 105 ℃ to 120 ℃ of the ammonia still process temperature of reaction of seething with excitement, reaction pressure 0.05 Mpa to 0.22 Mpa, reaction times are 1 hour to 2 hours, obtain the ammonia and the liquid of steam state respectively; The ammonia of steam state is through condensation and to be mixed with concentration be that 5% to 10% ammoniacal liquor is used for above-mentioned second step or/and 10% to 20% ammoniacal liquor is used for above-mentioned the 3rd step;
The 6th step; The liquid that above-mentioned boiling ammonia still process reaction obtains is proceeded after the evaporation concentration in closed reactor and under 800 ℃ to 900 ℃ of normal pressures, temperature of reaction, carries out the thermal degradation reaction to obtain solid oxidation magnesium and liquid hydrochloric acid respectively; And solid oxidation magnesium is used for above-mentioned boiling ammonia still process reaction, liquid hydrochloric acid is used for the above-mentioned the first step.
9. asbestos tailings comprehensive utilization method according to claim 7 is characterized in that being undertaken by following step:
The first step is 15% to 22% hydrochloric acid with asbestos tailings and concentration under normal pressure, 80 ℃ to 110 ℃, carry out 1 hour to 2 hours reaction after, filter and obtain pickling liquor and acid leaching residue respectively;
Second step; Pickling liquor that earlier the first step is obtained and oxygenant carry out sufficient oxidizing reaction makes ferrous iron wherein become ferric iron; React under normal pressure, 50 ℃ to 90 ℃ with the ammoniacal liquor of 5 % to 10 % then; When pH value to 7 stopped reaction to 8 time, obtain the solid iron oxide red and the second step filtrating respectively through filtering;
In the 3rd step, the above-mentioned second step filtrating and 10% to 20% ammoniacal liquor after normal pressure, 50 ℃ to 90 ℃, pH value are reaction in 10 to 11 times 1 hour to 2 hours, are filtered and obtain the solid high purity magnesium hydroxide respectively and the 3rd step filtrated;
The 4th step was that electrosmelted magnesite clinker, lower floor are ferrosilicon with obtaining the upper strata 2200 ℃ to 2500 ℃ reactions in following 1 hour to 2 hours behind above-mentioned acid leaching residue and iron oxide red and the coke thorough mixing;
The 5th step, will be above-mentioned the 3rd step filtrating add the Natural manganese dioxide ammonia still process reaction of seething with excitement, 105 ℃ to 120 ℃ of the ammonia still process temperature of reaction of seething with excitement, reaction pressure 0.05 Mpa to 0.22 Mpa, reaction times are 1 hour to 2 hours, obtain the ammonia and the liquid of steam state respectively; The ammonia of steam state is through condensation and to be mixed with concentration be that 5% to 10% ammoniacal liquor is used for above-mentioned second step or/and 10% to 20% ammoniacal liquor is used for above-mentioned the 3rd step;
The 6th step; The liquid that above-mentioned boiling ammonia still process reaction obtains is proceeded after the evaporation concentration in closed reactor and under 800 ℃ to 900 ℃ of normal pressures, temperature of reaction, carries out the thermal degradation reaction to obtain solid oxidation magnesium and liquid hydrochloric acid respectively; And solid oxidation magnesium is used for above-mentioned boiling ammonia still process reaction, liquid hydrochloric acid is used for the above-mentioned the first step.
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| CN102285674B (en) * | 2010-12-30 | 2013-11-27 | 新疆蓝天伟业科技开发有限公司 | Method for comprehensively utilizing low-grade magnesite |
| CN102703982B (en) * | 2012-06-18 | 2015-04-08 | 辽宁工程技术大学 | Method for preparing magnesium carbonate trihydrate crystal whisker by utilizing serpentine |
| WO2016051098A1 (en) * | 2014-10-02 | 2016-04-07 | Elektron Gri | Industrial method for the treatment of a product containing asbestos and the applications thereof |
| CN104891951B (en) * | 2015-05-19 | 2017-04-12 | 河北工程大学 | A method of extracting a silicon-magnesium-aluminum composite insulating material from asbestos tailings |
| FR3070282B1 (en) * | 2017-08-24 | 2019-09-06 | Universite De Montpellier | METHOD FOR DESTRUCTION AND VALORIZATION OF AMIANT WASTE |
| CN107917855A (en) * | 2017-11-29 | 2018-04-17 | 辽宁科技大学 | A kind of method and device for detecting iron-containing charge integral high temperature metallurgical performance |
| CN109513522B (en) * | 2019-01-25 | 2021-04-16 | 王玉亮 | Ore dressing device for recovering iron from asbestos tailings |
| CN115215593A (en) * | 2022-08-01 | 2022-10-21 | 西南科技大学 | Baking-free brick prepared based on asbestos waste and preparation method thereof |
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