CN113003781A - Treatment method of quartz sand pickling sewage - Google Patents
Treatment method of quartz sand pickling sewage Download PDFInfo
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- CN113003781A CN113003781A CN202110275691.6A CN202110275691A CN113003781A CN 113003781 A CN113003781 A CN 113003781A CN 202110275691 A CN202110275691 A CN 202110275691A CN 113003781 A CN113003781 A CN 113003781A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention belongs to the technical field of industrial sewage treatment, and particularly relates to a treatment method of quartz sand pickling sewage, wherein the pickling sewage at least contains hydrofluoric acid and oxalic acid, and the treatment method comprises the steps of neutralization reaction, flocculation precipitation, impurity removal, purification and the like.
Description
Technical Field
The invention belongs to the technical field of industrial sewage treatment, and particularly relates to a treatment method of quartz sand pickling sewage.
Background
At least 3 tons of water are used for producing 1 ton of quartz sand finished products in the acid washing processing of the quartz sand raw materials, but the existing quartz sand acid washing sewage purification effect is not good enough, and the water quality is difficult to meet the requirement of recycling, so a quartz sand acid washing sewage treatment method and a recycling method with better effect are needed. In addition, the existing treatment scheme, for example, chinese patent CN 111925002A-a quartz sand processing sewage treatment process, uniformly treats the pickling sewage discharged from the pickling tank and the sewage generated by sand washing in the spiral sand washer without distinguishing, causes secondary pollution between the two sewage with completely different conditions, is not beneficial to the overall treatment of sewage, and makes the operation flow more complicated.
Disclosure of Invention
In order to solve the problems, the invention provides a method for treating quartz sand pickling sewage, which at least contains hydrofluoric acid and oxalic acid, and is characterized by comprising the following steps of:
s1: reacting quartz sand with acid liquor in a pickling tank, and discharging pickling sewage discharged from the pickling tank into a transfer pool;
s2: pumping lime powder and acid pickling sewage in the transfer pool into a first lime stirring barrel for neutralization reaction;
s3: the first lime stirring barrel is connected with a second lime stirring barrel, and a mixture reacted in the first lime stirring barrel enters the second lime stirring barrel for further neutralization reaction;
s4: pumping the fully reacted mixture from a second lime stirring barrel to a dense precipitation hopper for flocculation precipitation, simultaneously performing deacidification treatment on the quartz sand reacted with the acid liquor in the step S1, transferring the quartz sand to a spiral sand washer, performing sand washing in the spiral sand washer to obtain mortar, pumping sewage generated by sand washing to the dense precipitation hopper for flocculation precipitation, wherein the dense precipitation hopper at least contains polyaluminium chloride;
s5: pumping the sewage in the dense settling hopper into an inclined tube settling tank for further settling impurities to obtain clear water with the pH value of 6-9, wherein the inclined tube settling tank at least contains polyacrylamide;
s6: and (5) pumping the clean water obtained in the step (S5) to a reverse osmosis box for removing impurities again, and transferring to a clean water tank.
And the acid liquor in the S1 is prepared by mixing 7-9% of oxalic acid, 1-3% of hydrofluoric acid and 90% of water, and the quartz sand and the acid liquor react for 6-8 hours at the temperature of 60-65 ℃.
And the S2 lime powder and the acid pickling sewage enter from the upper part of the first lime stirring barrel, and the mixture reacted in the S3 enters from the bottom of the second lime stirring barrel and is discharged from the top of the second lime stirring barrel after fully reacting.
Moreover, the deacidification treatment in S4 includes discharging the excessive acid solution and discharging the acid-washing wastewater.
The sewage generated by sand washing in the S4 comprises sand washing sewage and mortar dehydration sewage, wherein the sand washing sewage is sewage discharged from a spiral sand washer, and the mortar dehydration sewage is sewage discharged from a dehydration tank by natural water filtration, pressurized water filtration and vacuum water filtration of mortar; the natural water filtration is to pump the mortar from a sand inlet at the top of the dehydration tank to the dehydration tank under the condition that a sand outlet at the bottom of the dehydration tank is closed until wet sand is filled in the dehydration tank, and then the natural water filtration is stopped, and water is filtered from the bottom of the dehydration tank due to self weight, so that the water content of the mortar is reduced to below 20%; the pressurized water filtration means that gas is input to the top of the dewatering tank to apply air pressure in a state that the top of the dewatering tank is closed, the air pressure at the top presses water to be filtered out from the bottom of the dewatering tank, and pressurization is stopped after the water content of mortar at the upper part in the dewatering tank is reduced to be within 7%; the vacuum water filtration means that negative pressure is formed at the lower part of the dehydration tank by pumping out air at the lower part of the dehydration tank, the negative pressure promotes the water in the dehydration tank to be filtered out, and the air pumping is stopped after the water content of mortar at the lower part in the dehydration tank is reduced to be within 7 percent.
Furthermore, the substances precipitated in the S4 and S5 were subjected to pressure filtration by a filter press to become filter cake waste.
Wherein, the substances obtained by the precipitation in the S4 and the S5 are intensively transported to a buffer pool which is connected with a filter press.
And the method also comprises a recycling method of quartz sand pickling sewage, and specifically comprises the steps of directly using the treated water stored in the clean water tank in the S6 for sand washing in the spiral sand washer, and adding the water into a pickling tank to react with the quartz sand after preparing the acid liquor.
In addition, the method also comprises a quartz sand treatment method, which comprises the following specific steps:
step 1, conveying quartz sand to a pickling tank to react with acid liquor to obtain quartz sand reacted with the acid liquor;
step 2, deacidifying the quartz sand reacted with the acid liquor obtained in the step 1, moving the quartz sand to a spiral sand washer, repeatedly rubbing and washing the quartz sand with water, and removing impurities to obtain mortar;
step 3, pumping the mortar obtained in the step 2 to a dewatering tank, and reducing the water content of the mortar to be below 7% through natural water filtration, pressurized water filtration and vacuum water filtration;
step 4, drying the mortar obtained in the step 3 to obtain quartz sand with the removal rate of iron oxide reaching over 75 percent;
and 5, magnetically separating, screening and bagging the high-purity quartz sand obtained in the step 4 to obtain a finished product.
Compared with the prior art, the technical scheme has the beneficial effects that: 1. the quartz sand pickling sewage is subjected to neutralization reaction through the first lime stirring barrel and the second lime stirring barrel, so that hydrofluoric acid and oxalic acid in the pickling sewage are completely subjected to neutralization reaction, and the condition that the pickling sewage does not react in the first lime stirring barrel due to large flow is avoided; 2. the method is characterized in that different situations of pickling sewage discharged from a pickling tank and sewage generated by sand washing in a spiral sand washer are distinguished, the pickling sewage discharged from the pickling tank needs to be subjected to neutralization reaction and flocculation precipitation, and the sewage generated by sand washing in the spiral sand washer is subjected to flocculation precipitation, so that equipment is saved while different treatment methods are finely divided, and the treatment process is simplified; 3. the dense precipitation hopper contains a water purification material polyaluminium chloride (PAC), so that not only can flocculation precipitation be realized, but also possible micro-toxicants and heavy metal ions contained in the pickling sewage can be removed; 4. the inclined tube settling tank contains a water purifying material Polyacrylamide (PAM) to enable suspended particles in water to be condensed and clarified, and clear water with the pH value of 6-9 is obtained; 5. the reverse osmosis box is utilized to ensure the water quality transferred into the clean water tank to be pure; 6. the treated water can be continuously prepared into acid liquor to react with quartz sand, so that the recycling of water resources is realized, the production cost is reduced, and the environmental pollution is reduced; 7. the sewage generated by sand washing comprises sand washing sewage and mortar dehydration sewage, the sewage generated by sand washing can be recovered to the maximum extent through natural water filtration, pressurized water filtration and vacuum water filtration, the overall dehydration condition is uniform, the condition that drying is not thorough due to large local water content is avoided, and the subsequent treatment of quartz sand is facilitated; 8. the substances obtained by precipitation are intensively transported to a buffer tank, and are compressed and filtered by a filter press to form filter cake waste, so that the waste storage and treatment effects can be achieved.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples, and the present invention is not limited to the examples.
The acid washing process of the quartz sand comprises the steps of fully reacting the quartz sand with acid liquor to remove iron in the quartz sand, deacidifying the quartz sand, and transferring the quartz sand to a spiral sand washer to wash the sand. The sewage generated by the reaction with the acid liquor at least contains hydrofluoric acid and oxalic acid, and the sewage generated by transferring the deacidified sewage to a spiral sand washer for sand washing does not generally contain acid. Therefore, the method is very important for distinguishing and treating different conditions of pickling sewage discharged from a pickling tank and sewage after sand washing in a spiral sand washer and avoiding mutual secondary pollution between the two types of sewage with completely different conditions.
A treatment method of quartz sand pickling sewage comprises the following steps:
s1: reacting quartz sand with acid liquor in a pickling tank, discharging pickling sewage discharged from the pickling tank into a transfer tank, wherein the specific reaction process is that the quartz sand reacts for 6-8 hours at the temperature of 60-65 ℃, and the acid liquor is prepared by mixing 7-9% of oxalic acid, 1-3% of hydrofluoric acid and 90% of water. The main purpose of pickling is iron removal, and the specific chemical formula is Fe2O3+3H2C2O4＝2FeC2O4(precipitation) +2CO2+3H2And O, the pickling sewage discharged from the pickling tank accounts for about 30 percent of the whole sewage treatment amount, and the neutralization reaction and the flocculation precipitation are required to be carried out simultaneously. The transfer pool can play the role of storage and transfer.
S2: pumping lime powder and acid pickling sewage in the transfer pool into a first lime stirring barrel for neutralization reaction; the principle of the neutralization reaction is H2C2O4+Ca(OH)2＝CaC2O4(precipitation) +2H2O and 2HF + Ca (OH)2＝CaF2(precipitation) +2H2O。
S3: the first lime stirring barrel is connected with a second lime stirring barrel, and a mixture reacted in the first lime stirring barrel flows into the second lime stirring barrel for further neutralization reaction; in order to facilitate pumping of lime powder and pickling sewage into the first lime stirring barrel, the lime powder and the pickling sewage enter from the first lime stirring barrel, and the lime powder and the pickling sewage flow is large at times, so that the lime powder and the pickling sewage cannot complete neutralization reaction in the first lime stirring barrel and then flow away, therefore, the second lime stirring barrel is designed, and a reaction mixture enters from the bottom of the second lime stirring barrel and is discharged from the top of the second lime stirring barrel, so that hydrofluoric acid and oxalic acid in all the pickling sewage are ensured to fully react.
S4: pumping the fully reacted mixture from the second lime stirring barrel to a dense precipitation hopper for flocculation precipitation, simultaneously performing deacidification treatment on the quartz sand reacted with the acid liquor in the step S1, transferring the quartz sand to a spiral sand washer, performing sand washing in the spiral sand washer to obtain mortar, pumping sewage generated by sand washing to the dense precipitation hopper for flocculation precipitation, wherein the dense precipitation hopper at least contains polyaluminium chloride. Because the quartz sand raw material may carry micro-toxic and heavy metal ions, polyaluminium chloride (PAC) can remove it.
The sewage generated by sand washing accounts for about 70% of the whole sewage treatment capacity, and the part only needs flocculation and precipitation and does not need neutralization reaction. Therefore, the sewage is directly pumped into the dense settling hopper for flocculation and settling, and the pickling sewage discharged from the pickling tank completes neutralization reaction, so that the two parts cannot be subjected to secondary pollution.
The deacidification treatment comprises discharging excessive acid liquor and acid pickling sewage, recovering the excessive acid liquor to an acid return barrel, reconfiguring through an acid preparation barrel, storing in an acid storage barrel after configuring, and entering into a circulating barrel for use when recycling; the acid washing sewage enters a first lime stirring barrel and a second lime stirring barrel in S2 and S3 and enters a dense settling hopper for neutralization reaction. Therefore, the quartz sand after deacidification treatment is transferred to the spiral sand washer and does not contain acid.
The sewage generated by sand washing comprises sand washing sewage and mortar dehydration sewage, wherein the sand washing sewage is sewage discharged from a spiral sand washing machine, and the mortar dehydration sewage is sewage discharged from a dehydration tank by natural water filtration, pressurized water filtration and vacuum water filtration of mortar; the natural water filtration is to pump the mortar from a sand inlet at the top of the dehydration tank to the dehydration tank under the condition that a sand outlet at the bottom of the dehydration tank is closed until wet sand is filled in the dehydration tank, and then the natural water filtration is stopped, and water is filtered from the bottom of the dehydration tank due to self weight, so that the water content of the mortar is reduced to below 20%; the pressurized water filtration means that gas is input to the top of the dewatering tank to apply air pressure in a state that the top of the dewatering tank is closed, the air pressure at the top presses water to be filtered out from the bottom of the dewatering tank, and pressurization is stopped after the water content of mortar at the upper part in the dewatering tank is reduced to be within 7%; the vacuum water filtration means that negative pressure is formed at the lower part of the dehydration tank by pumping out air at the lower part of the dehydration tank, the negative pressure promotes the water in the dehydration tank to be filtered out, and the air pumping is stopped after the water content of mortar at the lower part in the dehydration tank is reduced to be within 7 percent. The three processes can ensure that the water content in all the mortar in the tank from top to bottom is reduced to below 7 percent, and the sewage generated by sand washing can be recovered to the maximum extent. The remaining water is dried in the dryer.
S5: pumping the sewage in the dense settling hopper into an inclined tube settling tank for further settling impurities to obtain clear water with the pH value of 6-9, wherein the inclined tube settling tank at least contains Polyacrylamide (PAM) which can enable suspended particles in the water to be condensed and clarified.
S6: and (5) pumping the clean water obtained in the step (S5) to a reverse osmosis box or a reverse osmosis water purifier for removing impurities again, and transferring to a clean water tank.
And (4) directly using the treated water stored in the clean water tank in the S6 for sand washing in the spiral sand washer, preparing into acid liquor, adding the acid liquor into the pickling tank, and reacting with the quartz sand to finish the recycling of the quartz sand pickling sewage.
Preferably, sediment gained material is concentrated and is transported to the buffer pool in S4 and S5, the buffer pool is connected with the pressure filter, compresses tightly the filtration through the pressure filter and becomes the filter cake waste material, can have the effect of storing and handling the waste material concurrently, and the buffer pool can be convenient for the production rate of direct observation waste material simultaneously, provides the reference for adjusting the filter-pressing speed of pressure filter.
The invention also comprises a corresponding quartz sand treatment method, which comprises the following specific steps:
step 1, conveying quartz sand to a pickling tank to react with acid liquor to obtain quartz sand reacted with the acid liquor;
step 2, deacidifying the quartz sand reacted with the acid liquor obtained in the step 1, moving the quartz sand to a spiral sand washer, repeatedly rubbing and washing the quartz sand with water, and removing impurities to obtain mortar;
step 3, pumping the mortar obtained in the step 2 to a dewatering tank, and reducing the water content of the mortar to be below 7% through natural water filtration, pressurized water filtration and vacuum water filtration;
step 4, drying the mortar obtained in the step 3 to obtain quartz sand with the removal rate of iron oxide reaching over 75 percent;
and 5, magnetically separating, screening and bagging the high-purity quartz sand obtained in the step 4 to obtain a finished product.
Step 1, deacidifying the quartz sand after acid liquor reaction in a pickling tank, wherein the deacidification method comprises the specific steps of enabling the acid liquor to flow into a pickling tank through a filtering acid pipeline of the pickling tank after the reaction is finished, supplementing water from the top of the pickling tank to nourish the sand after the acid liquor on the top of the pickling tank is lower than a sand surface, further discharging the acid liquor by utilizing water pressure, and closing the filtering acid pipeline to finish deacidification when the acid liquor amount recovered from the pickling tank reaches the acid liquor amount used for the reaction of the pickling tank.
And 2, removing impurities and whitening by repeatedly rubbing and washing the quartz sand, and facilitating the deacidification of the quartz sand to be cleaner.
And 3, the water content in all the mortar in the tank from top to bottom can be reduced to below 7%, the whole dehydration condition is uniform, the condition of incomplete drying caused by large local water content is avoided, and the subsequent treatment of the quartz sand is facilitated.
And 4, drying means that the obtained mortar is conveyed to the top of the dryer through a conveyor belt, the mortar is distributed to each dryer in a top scraper mode for distribution, the mortar is conveyed to the dryer for drying, a heat source pipeline of the dryer surrounds and is not communicated with a blanking pipeline of the quartz sand, so that a heat source is not directly contacted with the mortar, and the mortar is dried and loosened and then naturally falls into a hopper below the dryer from the top of the dryer to obtain the quartz sand. Because the heat source is not directly contacted with the mortar, the quartz sand obtained is rapidly blanked during drying, and no black spot is increased without color change during drying.
Step 5, the magnetic separation process can use a magnetic separator, and the screening process can use a square swinging screen.
And in the step 1, the acid liquor is also recycled, and the recycling method comprises the steps of heating the acid liquor by a heat exchanger, then feeding the heated acid liquor into the bottom of the pickling tank, reacting with quartz sand, then overflowing from the top of the pickling tank into a circulating barrel, and pumping the acid liquor into the heat exchanger for heating. And (3) the acid liquor enters a circulating barrel from the pickling tank, and the acid liquor enters the pickling tank after being heated in the circulating barrel to react with the quartz sand. Namely, the acid liquor flows to form a circulation process of a circulation barrel, a heat exchanger, the bottom of the pickling tank, the top of the pickling tank and the circulation barrel, and the acid liquor enters the pickling tank to react with the quartz sand after reaching a preset temperature, so that the reaction effect is improved. The recycling method of the acid liquor is matched with the recycling method, so that the pollution of the acid liquor to the environment is reduced.
And in the step 1, the acid liquor is also recycled, wherein the recycling method comprises the steps of recycling the acid liquor from the acid washing tank to the acid recycling barrel after being used in the step 1, reconfiguring the acid liquor through the acid preparation barrel, storing the acid liquor in the acid storage barrel after being reconfigured, and recycling the acid liquor from the acid storage barrel to the circulating barrel.
Claims (9)
1. A treatment method of quartz sand pickling sewage at least containing hydrofluoric acid and oxalic acid is characterized by comprising the following steps:
s1: reacting quartz sand with acid liquor in a pickling tank, and discharging pickling sewage discharged from the pickling tank into a transfer pool;
s2: pumping lime powder and acid pickling sewage in the transfer pool into a first lime stirring barrel for neutralization reaction;
s3: the first lime stirring barrel is connected with a second lime stirring barrel, and a mixture reacted in the first lime stirring barrel enters the second lime stirring barrel for further neutralization reaction;
s4: pumping the fully reacted mixture from a second lime stirring barrel to a dense precipitation hopper for flocculation precipitation, simultaneously performing deacidification treatment on the quartz sand reacted with the acid liquor in the step S1, transferring the quartz sand to a spiral sand washer, performing sand washing in the spiral sand washer to obtain mortar, pumping sewage generated by sand washing to the dense precipitation hopper for flocculation precipitation, wherein the dense precipitation hopper at least contains polyaluminium chloride;
s5: pumping the sewage in the dense settling hopper into an inclined tube settling tank for further settling impurities to obtain clear water with the pH value of 6-9, wherein the inclined tube settling tank at least contains polyacrylamide;
s6: and (5) pumping the clean water obtained in the step (S5) to a reverse osmosis box for removing impurities again, and transferring to a clean water tank.
2. The method for treating sewage from quartz sand pickling of claim 1, wherein: the acid liquor in the S1 is prepared by mixing 7-9% of oxalic acid, 1-3% of hydrofluoric acid and 90% of water, and the reaction of the quartz sand and the acid liquor is carried out for 6-8 hours at the temperature of 60-65 ℃.
3. The method for treating sewage from quartz sand pickling of claim 1, wherein: the S2 lime powder and the acid pickling sewage enter from the upper part of the first lime stirring barrel, and the mixture reacted in the S3 enters from the bottom of the second lime stirring barrel and is discharged from the top of the second lime stirring barrel.
4. The method for treating sewage from quartz sand pickling of claim 1, wherein: the deacidification treatment in the step S4 comprises discharging excessive acid liquor and discharging pickling sewage.
5. The method for treating sewage from quartz sand pickling of claim 1, wherein: the sewage generated by sand washing in the S4 comprises sand washing sewage and mortar dehydration sewage, wherein the sand washing sewage is sewage discharged from a spiral sand washer, and the mortar dehydration sewage is sewage discharged from a dehydration tank by natural water filtration, pressurized water filtration and vacuum water filtration of mortar; the natural water filtration is to pump the mortar from a sand inlet at the top of the dehydration tank to the dehydration tank under the condition that a sand outlet at the bottom of the dehydration tank is closed until wet sand is filled in the dehydration tank, and then the natural water filtration is stopped, and water is filtered from the bottom of the dehydration tank due to self weight, so that the water content of the mortar is reduced to below 20%; the pressurized water filtration means that gas is input to the top of the dewatering tank to apply air pressure in a state that the top of the dewatering tank is closed, the air pressure at the top presses water to be filtered out from the bottom of the dewatering tank, and pressurization is stopped after the water content of mortar at the upper part in the dewatering tank is reduced to be within 7%; the vacuum water filtration means that negative pressure is formed at the lower part of the dehydration tank by pumping out air at the lower part of the dehydration tank, the negative pressure promotes the water in the dehydration tank to be filtered out, and the air pumping is stopped after the water content of mortar at the lower part in the dehydration tank is reduced to be within 7 percent.
6. The method for treating sewage from quartz sand pickling of claim 1, wherein: the substances precipitated in the S4 and S5 are subjected to pressure filtration by a filter press to become filter cake waste.
7. The method for treating sewage from quartz sand pickling of claim 6, wherein: the substances precipitated in the S4 and S5 are collectively transported to a buffer tank, and the buffer tank is connected with a filter press.
8. The method for treating sewage from quartz sand pickling of claim 1, wherein: the method also comprises a recycling method of quartz sand pickling sewage, and specifically comprises the steps of directly using the treated water stored in the clean water tank in the S6 for sand washing in a spiral sand washer, preparing acid liquor, and adding the acid liquor into a pickling tank to react with quartz sand.
9. The method for treating quartz sand pickling wastewater as claimed in claim 1, further comprising the step of treating quartz sand, comprising the steps of:
step 1, conveying quartz sand to a pickling tank to react with acid liquor to obtain quartz sand reacted with the acid liquor;
step 2, deacidifying the quartz sand reacted with the acid liquor obtained in the step 1, moving the quartz sand to a spiral sand washer, repeatedly rubbing and washing the quartz sand with water, and removing impurities to obtain mortar;
step 3, pumping the mortar obtained in the step 2 to a dewatering tank, and reducing the water content of the mortar to be below 7% through natural water filtration, pressurized water filtration and vacuum water filtration;
step 4, drying the mortar obtained in the step 3 to obtain quartz sand with the removal rate of iron oxide reaching over 75 percent;
and 5, magnetically separating, screening and bagging the high-purity quartz sand obtained in the step 4 to obtain a finished product.
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| CN115403049A (en) * | 2022-08-30 | 2022-11-29 | 资兴旗滨硅业有限公司 | Purification method and purification system of quartz sand |
| CN116332190A (en) * | 2023-03-30 | 2023-06-27 | 湖南旗滨光能科技有限公司 | Quartz sand pickling system and pickling process |
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| CN111992331A (en) * | 2020-09-01 | 2020-11-27 | 安徽南玻石英材料有限公司 | Continuous pickling production method and production equipment for quartz sand |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115403049A (en) * | 2022-08-30 | 2022-11-29 | 资兴旗滨硅业有限公司 | Purification method and purification system of quartz sand |
| CN116332190A (en) * | 2023-03-30 | 2023-06-27 | 湖南旗滨光能科技有限公司 | Quartz sand pickling system and pickling process |
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Application publication date: 20210622 |