CN102674376B - Production method of quartz tailing purification - Google Patents
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Abstract
The invention relates to the technical field of nonmetallic ore processing, in particular to a production method of quartz tailing purification. The production method is characterized by comprising the following process steps: washing and deslagging, alkaline-washing, acid-washing and drying. The production method has the beneficial effects that quartz tailings are changed from wastes into valuables, the purity, the color, the whiteness and other problems of the quartz tailings are basically solved, and the production method can be widely applied to silicon micro-powder, high-grade ceramic aggregates, ceramic fabrics, ceramic glazes, water glass, high-grade glass fiber, electrician electrical fillers, artificial quartz stone plate, precision castings and the like.
Description
(i) technical field: the present invention relates to the processing technique field of nonmetalliferous ore, the production method that especially a kind of quartz tail sand is purified.
(ii) background technology: quartz sand is a kind of ceramic, it is widely used in the industries such as glass, pottery, refractory materials, casting, chemical industry, electronics, electrical equipment, tap water filter and inorganic silicate, its production technique is after the former mining crusher in crushing of quartzite (rock) is arrived to a certain size bulk, then makes the particle in certain particle size interval with sand machine processed or ore mill.The technique of its production mainly contains two kinds: a kind of is dry method, and a kind of is wet method.During dry production
,Easily cause dust pollution, the direct labor easily suffers from silicosis, and country strictly limits this method and produces; Wet method is present general production method, and it is that the ore particles after fragmentation is added in grinding machine together with water, with irony or stone matter grinding machine, is ground.Levigate material forms slip together with water, flows out grinding machine.Then, then carrying out classification with water sieve or hydraulic grading device, collect the material of needed grain size intervals, is qualified quartz sand, and in this process, the particle of undesirable large particle diameter returns to grinding machine and regrinds or use it for anything else.The particulate matter that is less than certain particle diameter requirement is usually that our alleged tailings flows into the settling tank precipitation.Due to this tailings be in the course of processing through pulverizing the particle that formed particle diameter is less, its surface can and specific surface area than finished sand greatly, adsorptive power is also strong, the settling time in water is long.Therefore, the impurity that this tailings adsorbs is also more, and Here it is our common seen tailings is than the reason of the color of finished sand (whiteness) dark (low).According to knowhow: one ton of quartz sand finished product of every production, need the quartzy raw ore of 1.2-1.4 ton left and right, produce the tailings of 0.2 ton of left and right.The enterprise of scale in each quartz sand production, thousands of ton, the quartz tail sand of hundreds of thousands of ton are even arranged every year, if tailings is not recycled, enterprise not only needs certain place stacking, give environment, but also directly affect the whole economic efficiency of enterprise.At present, the domestic several of only having enterprise adopts flotation process to purify and utilizes this tailings, and flotation process can only be removed a certain amount of mechanical irony, but can't clean other impurity that clean tailings particle surface adsorbs fully, also can't fundamentally solve the problems such as purity, color and whiteness of tailings, its use range is very restricted.Now, most of quartz sand manufacturing enterprise does not all carry out deep processing to tailings and is used, but, as waste material and refuse treatment, is because up to the present, and the appropriate technology of purity and whiteness does not also improve in China about the quartz sand tailings.
(iii) summary of the invention: purpose of the present invention is exactly tailings to be done to the pollution that waste disposal causes and adopted flotation process to process the problems such as the quality product that tailings obtains is not high, the scope of application is restricted and the production method that provides a kind of quartz tail sand to purify in order to solve in existing quartz sand production process.
Design philosophy of the present invention is: 1. (its composition is SiO to utilize quartz
2) the tailings grain diameter less easily and alkali lye (as the aqueous solution of sodium hydroxide or sodium carbonate or potassium hydroxide or salt of wormwood all can, take the sodium hydroxide lye of chlor-alkali plant as most economical) in the situation that heating, reaction generates the water-soluble characteristic of water glass (potassium) and cleans its epidermis; Water glass (potassium) the solution recovery generated.2. utilize alkali matter and the iron mineral impurity of hot mineral acid (hydrochloric acid, sulfuric acid, nitric acid etc. all can, take sulfuric acid as optimum) liquid except surface adsorption in the shakeout particle, thereby reach the purpose of purification.3. the acid-bearing wastewater in water washing process is neutralized with milk of lime, clear water recycling after precipitation after neutralization.Its chemical equation is:
The chemical equation of alkaline cleaning procedure is:
2SiO
2 + 4 NaOH = 2Na
20.2SiO
2 + 2H
2O
2SiO
2 + 2Na
2CO
3 = 2Na
20.2SiO
2 + 2CO
2
2SiO
2 + 4 KOH = 2K
20.2SiO
2 + 2H
2O
2SiO
2 + 2K
2CO
3 = 2K
20.2SiO
2 + 2CO
2
The chemical equation of acid cleaning process is:
2Na
20.2SiO
2 + 2H
2SO
4 = 2Na
2SO
4 + 2SiO
2
2K
20.2SiO
2 + 2H
2SO
4 = 2K
2SO
4 + 2SiO
2
Fe + H
2SO
4 = FeSO
4 + H
2
After washing, the chemical equation of acid-bearing wastewater neutralization is:
Ca (OH)
2+ H
2SO
4=CaSO
4(precipitation)+H
2O
For realizing the purpose of foregoing invention, the present invention realizes as follows: 1. washing is removed slag: clear water washing for quartz tail sand, desliming, more standby after gravity treatment, magnetic separation, dehydration; 2. alkali cleaning: band stir and the alkaline bath of heating in tailings after first adding above-mentioned cleaning, the alkali lye that adds again 5%-30% concentration, control pulp density (solid-to-liquid ratio) at 30-60%, the 100-160 degree (℃) temperature under stirring reaction 2-8 hour, and then cooling, filter recycle of alkali liquor and apply mechanically (recycling), with a small amount of clear water washing material, then it is standby to dewater; 3. pickling: band stir and the acid-resistant reactor of heating in tailings after first adding the dehydration alkali cleaning, the sulfuric acid or hydrochloric acid or the nitric acid that add again 10-20% concentration, and the concentration of control slip (solid-to-liquid ratio) is at 30-60%, again the 80-100 degree (℃) temperature under after stirring reaction 2-8 hour, cooling slip, filter the acid solution recovery, it is qualified with the clear water washing material, to PH=6-7, to be; 4. dry: the material after dehydration in above-mentioned 3 is sent in drying machine, the 120-500 degree (℃) temperature under dry, cooled material is the high quality quartz tail sand.
In order to improve purity, in the present invention, increase a magnetic separation processing step is last in (3).
In order to guarantee alkali cleaning effect and reducing costs, in the present invention processing step (2) in the alkali lye of use be the aqueous solution of selecting sodium hydroxide or potassium hydroxide, it is also feasible certainly using other alkali lye.
Also quartz tail sand is processed to waste water later in the present invention and carry out processing and utilizing, specifically by acid-bearing wastewater, flow into neutralization tank, neutralize PH=7 with milk of lime, then carry out precipitation process, the clear water after precipitation reuses, and the calcium sulfate after precipitation can be used as cement additive.
Production technique of the present invention is simple, and cost is low, and the quartz sand powder quality of production is good, after testing: SiO
2: 99%-99.8%, Fe
2O
3: 0.003%-0.018%, whiteness: 80-93.Can be widely used in silicon powder, high-grade ceramic aggregate, ceramic fabric, ceramic glaze, water glass, high-grade glass fiber, the electric filler of electrician, artificial quartz stone plate, precision casting etc., the present invention is scientific and reasonable has made good use of the quartz tail sand resource, quartz tail sand is turned waste into wealth, and effectively avoided the tailings contaminate environment, there is significant economic benefit and social benefit.
(iv) embodiment:
Below in conjunction with specific embodiment, further detailed description the present invention.Should be understood that these embodiment just in order to demonstrate the invention, but not limit the scope of the invention by any way.
Embodiment 1: the present invention is that the tailings of take after the quartzy processing in Ling Qiu mountain range, Qichun County, Hubei Province is raw material, produces the high quality quartz sand powder, and processing process is as follows:
(1) wash away slag: the slurry with khaki quartz tail sand furnishing 20-50% concentration, with sand pump, deliver in header tank, it is carried out to countercurrent washing, after sloughing yellow mud, stop washing, the material after washing is put and selected in machine (as spiral chute), after separating the irony material, carry out again a magnetic separation (employing magnetic separator), standby after the material dewatering after magnetic separation;
(2) alkali cleaning: above-mentioned material is put in the alkaline bath of band stirring and heating unit, add the alkali lye (can adopt wet chemical is alkali lye) of 5% concentration to be made into slip, pulp density (solid-to-liquid ratio) is controlled between 30%, opens and stirs and heating unit, makes its temperature be controlled at 100 degree left and right, and at this temperature insulation reaction 8 hours, stop heating, to material, be down to room temperature, then deviate from alkali lye and return and apply mechanically, with after a small amount of water washing material, then it is standby to remove moisture;
(3) pickling: the material after above-mentioned alkali cleaning dehydration is put into to the acid-resistant reactor that band stirs and heats, the sulfuric acid that adds again 10% concentration, control pulp density (solid-to-liquid ratio) in 30% left and right, then at the temperature of 80 degree stirring reaction after 8 hours, cooling slip, deviate from the acid solution recovery.It is qualified with the clear water washing material, to PH=6-7, to be, by the magnetic separation again of the material after water washing;
(4) dry: the material after dehydration magnetic separation in above-mentioned 3 is sent in drying machine, drying at the temperature of 120 degree, cooled material is that finished product is the high quality quartz sand powder, after testing: SiO
2: 99.5%, Fe
2O
3: 0.008%, whiteness: 82;
(5) the vitriolated waste water in water washing process, flow into neutralization tank, with milk of lime, neutralizes PH=7, then carries out precipitation process, and the clear water after precipitation reuses.
Embodiment 2: the present invention is that the tailings of take after the quartz mine in Xin County, District, Xinyang Area, Henan Province city processing is raw material, produces the high quality quartz sand powder, and processing process is as follows:
1. washing is removed slag: the slurry with lurid quartz tail sand furnishing 20% concentration, with sand pump, deliver in header tank, it is carried out to countercurrent washing, after sloughing yellow mud, stop washing, this material is put into to gravity concentrator, after separating the irony material, carry out again a magnetic separation, standby after the material dewatering after magnetic separation;
2. alkali cleaning: above-mentioned material is put in band stirring and heating unit alkaline bath, the alkali lye (can adopt aqueous sodium hydroxide solution) that adds 10% concentration, make its pulp density (solid-to-liquid ratio) between 40%, open and stir and heating, make its temperature be controlled at 120 degree left and right, and at this temperature insulation reaction 6 hours, stop heating, to material, be down to room temperature, then adopt centrifuging to deviate from recycle of alkali liquor to apply mechanically, with after a small amount of water washing material, then it is standby to remove moisture;
3. pickling: the material after above-mentioned alkali cleaning dehydration is put into to the acid-resistant reactor that band stirs and heats, the hydrochloric acid that adds again 15% concentration, control pulp density (solid-to-liquid ratio) in 40% left and right, then at the temperature of 90 degree stirring reaction after 6 hours, cooling slip, deviate from the acid solution recovery.It is qualified with the clear water washing material, to PH=6-7, to be, and by the material after water washing, send magnetic separator magnetic separation again;
4. dry: the material after dehydration magnetic separation in above-mentioned 3 is sent in drying machine, and dry at the temperature of 200 degree, cooled material is finished product, after testing: SiO
2: 99.6%, Fe
2O
3: 0.003%, whiteness: 93;
5. the vitriolated waste water in water washing process, flow into neutralization tank, with milk of lime, neutralizes PH=7, then carries out precipitation process, and the clear water after precipitation reuses.
Embodiment 3: the present invention is that the tailings of take after the processing of Qinhuangdao, Henan Province quartz mine is raw material, produces the high quality quartz sand powder, and processing process is as follows:
1. washing is removed slag: the slurry of quartz tail sand furnishing 40% concentration with deep yellow, with sand pump, deliver in header tank, it is carried out to countercurrent washing, after sloughing yellow mud, stop washing, this material is put into to gravity concentrator, after separating the irony material, carry out again a magnetic separation, standby after the material dewatering after magnetic separation;
2. alkali cleaning: above-mentioned material is put in band stirring and heating unit alkaline bath, the alkali lye (can adopt potassium hydroxide aqueous solution is alkali lye) that adds 20% concentration, make its solid-to-liquid ratio between 50%, open and stir and heating, make its temperature be controlled at 150 degree left and right, and at this temperature insulation reaction 4 hours, stop heating, be down to room temperature to material, then deviate from recycle of alkali liquor and apply mechanically, with after a small amount of water washing material, then it is standby to remove moisture;
3. pickling: the material after above-mentioned alkali cleaning dehydration is put into to the acid-resistant reactor that band stirs and heats, the nitric acid that adds again 18% concentration, control pulp density (solid-to-liquid ratio) in 50% left and right, then at the temperature of 100 degree stirring reaction after 2 hours, cooling slip, filter the acid solution recovery.It is qualified with the clear water washing material, to PH=6-7, to be;
4. dry: the material after dehydration in above-mentioned 3 is sent in drying machine, and dry at the temperature of 300 degree, cooled material is finished product.After testing: SiO
2: 99%, Fe
2O
3: 0.018%, whiteness: 85;
5. the vitriolated waste water in water washing process, flow into neutralization tank, with milk of lime, neutralizes PH=7, then carries out precipitation process, and the clear water after precipitation reuses.
Embodiment 4: the present invention is that the tailings of take after the quartz mine of Taihu County, Anqing, Anhui Province processing is raw material, produces the high quality quartz sand powder, and processing process is as follows:
1. washing is removed slag: the slurry with lurid quartz tail sand furnishing 30% concentration, with sand pump, deliver in header tank, it is carried out to countercurrent washing, after sloughing yellow mud, stop washing, this material is put into to gravity concentrator, after separating the irony material, carry out again a magnetic separation, standby after the material dewatering after magnetic separation;
2. alkali cleaning: above-mentioned material is put in band stirring and heating unit alkaline bath, the alkali lye (can adopt aqueous sodium carbonate is alkali lye) that adds 30% concentration, make its pulp density (solid-to-liquid ratio) between 60%, open and stir and heating, make its temperature be controlled at 160 degree left and right, and at this temperature insulation reaction 2 hours, stop heating, be down to room temperature to material, then deviate from recycle of alkali liquor and apply mechanically, with after a small amount of water washing material, then it is standby to adopt vacuum filtration to remove moisture;
3. pickling: the material after above-mentioned alkali cleaning dehydration is put into to the acid-resistant reactor that band stirs and heats, the sulfuric acid or hydrochloric acid or the nitric acid that add again 20% concentration, control pulp density (solid-to-liquid ratio) in 60% left and right, stirring reaction after 4 hours at the temperature of 100 degree again, cooling slip, filter the acid solution recovery.It is qualified with the clear water washing material, to PH=6-7, to be, by the magnetic separation again of the material after water washing;
4. dry: the material after dehydration magnetic separation in above-mentioned 3 is sent in drying machine, and dry at the temperature of 400 degree, cooled material is finished product.After testing: SiO
2: 99.8%, Fe
2O
3: 0.003%, whiteness: 93;
5. the vitriolated waste water in water washing process, flow into neutralization tank, with milk of lime, neutralizes PH=7, then carries out precipitation process, and the clear water after precipitation reuses.
Claims (4)
1. the production method that a quartz tail sand is purified is characterized in that: comprise following processing step: (1) washing is removed slag: clear water washing for quartz tail sand, desliming, more standby after gravity treatment, magnetic separation, dehydration; (2) alkali cleaning: band stir and the alkaline bath of heating in tailings after first adding above-mentioned cleaning, the alkali lye that adds again 5%-30% concentration, control pulp density at 30-60%, stirring reaction 2-8 hour at the temperature of 100-160 degree, and then cooling, filter recycle of alkali liquor and apply mechanically, with a small amount of clear water washing material, then it is standby to dewater; (3) pickling: band stir and the acid-resistant reactor of heating in tailings after first adding the dehydration alkali cleaning, the sulfuric acid or hydrochloric acid or the nitric acid that add again 10-20% concentration, and the concentration of control slip is at 30-60%, again at the temperature of 80-100 degree after stirring reaction 2-8 hour, cooling slip, filter the acid solution recovery, it is qualified with the clear water washing material, to pH=6-7, to be; (4) dry: the material after dehydration in above-mentioned steps 3 is sent in drying machine, and dry at the temperature of 120-500 degree, cooled material is the high quality quartz tail sand.
2. the production method that a kind of quartz tail sand according to claim 1 is purified, it is characterized in that: quartz tail sand is processed to waste water later and carry out processing and utilizing, specifically by acid-bearing wastewater, flow into neutralization tank, neutralize pH=7 with milk of lime, then carry out precipitation process, the clear water after precipitation reuses, and the calcium sulfate after precipitation can be used as cement additive.
3. the production method that a kind of quartz tail sand according to claim 1 is purified is characterized in that: increase a magnetic separation processing step is last in (3).
4. the production method that a kind of quartz tail sand according to claim 1 is purified is characterized in that: processing step (2) in the alkali lye of use be the aqueous solution of selecting sodium hydroxide or sodium carbonate or potassium hydroxide or salt of wormwood.
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