CN114751605B - Treatment method for producing calcium magnesium salt mud by brine purification and application thereof - Google Patents
Treatment method for producing calcium magnesium salt mud by brine purification and application thereof Download PDFInfo
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- CN114751605B CN114751605B CN202210342959.8A CN202210342959A CN114751605B CN 114751605 B CN114751605 B CN 114751605B CN 202210342959 A CN202210342959 A CN 202210342959A CN 114751605 B CN114751605 B CN 114751605B
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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
- C02F11/00—Treatment of sludge; Devices therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
Abstract
The invention provides a treatment method for producing calcium magnesium salt mud by brine purification and application thereof, and belongs to the technical field of salt mud treatment. Before salt is prepared by vacuum evaporation, calcium and magnesium ions in brine are removed in a precipitation form of magnesium hydroxide, calcium sulfate, calcium carbonate and the like, brine mud is thickened to recover brine, then brine and clear water are added for dilution, the brine mud is conveyed to a mining area through a mud conveying pipeline, the brine mud is injected into a mine through a multistage pump, the flow rate of the mud is reduced after the mud enters the mine, salt mud particles are precipitated to the bottom of the mine, and unsaturated brine is returned to a production system after salt dissolution saturation. Through the return of the salt mud to the well, the salt mud treatment problem is fundamentally solved, the environmental pollution is avoided, and the production cost is greatly reduced. Accounting according to the million tons of salt yield, the generation of the salt mud is about 5 ten thousand tons each year, the annual saving cost is about 300 ten thousand yuan, and the method has profound effects on solving the salt mud treatment problem, thus having good practical application value.
Description
Technical Field
The invention belongs to the technical field of salt mud treatment, and particularly relates to a treatment method for producing calcium magnesium salt mud by brine purification and application thereof.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
At present, brine is purified to produce salt mud, after brine is recovered through filter press filtration, the salt mud solid waste is obtained through washing and drying, and the salt mud solid waste is mainly used for manufacturing building blocks, cement production additives and the like, but the salt mud can meet the requirements of building material raw materials through repeated and massive washing in the filter press and washing processes, so that the production pressure is high and the operation cost is high.
Meanwhile, in the salt mud filter pressing process, the production site is poor, the labor intensity of workers is high, and unsafe factors and production difficulties are brought to production. Taking 100 ten thousand tons of industrial salt produced by Texas in a year as an example, the industrial salt can simultaneously produce about 5 ten thousand tons of salt mud per year, and a large amount of salt mud is produced, which is not proportional to the application amount of the salt mud, so that the salt mud is often in a stagnation state, and the enterprise has to bear high treatment cost of the salt mud, thereby indirectly improving the production cost of the industrial salt.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a treatment method for producing calcium magnesium salt mud by brine purification and application thereof.
In order to achieve the above object, the present invention relates to the following technical solutions:
in a first aspect of the invention, there is provided a process for the purification of brine to produce a calcium magnesium salt slurry, the process comprising: stirring the generated salt mud slurry to react to form stable salt mud slurry, carrying out layered sedimentation on the stable salt mud slurry to obtain supernatant and thick mud, adding brine and clear water into the thick mud slurry to carry out slurry mixing treatment, controlling the solid content to be 5-10%, and carrying out well injection operation on the thick mud slurry.
Wherein the salt mud is obtained after being treated by a brine purification process.
The stirring reaction can be completed in a slurry barrel, the salt slurry thoroughly reacts under the stirring action, sulfate radicals, calcium carbonate, hydroxide radicals and calcium magnesium ions reach final balance, so that particles such as magnesium hydroxide, calcium carbonate, calcium sulfate and the like are formed, and the solid content of the slurry is controlled to be 7-10% by sampling and monitoring, so that the stable salt slurry is obtained.
The layered sedimentation can be performed in the thickener, so that salt mud particles naturally settle to the bottom in the thickener to obtain thick mud; the supernatant is recovered and collected and can be used as brine for repeated use; the invention creatively provides a thickener for thickening salt mud slurry, meanwhile, the supernatant is recovered (the recovery rate can be more than 70%), the recovered brine is purified, in theory, the more the recovery benefit is, in order to keep continuous production and stable operation of the system, the recovery rate of more than 60% is basically maintained, and the density of fluid is properly improved after the original brine is mixed, so that the purpose of continuous production is achieved. This is a great economic benefit for cost control of brine purification.
The concrete operation method of the size mixing treatment comprises the following steps: adding clear water (the volume flow is V1) and brine (the volume flow is V2) into thick mud (the volume flow is V3), wherein the addition of the clear water is required to meet the condition that the volume of the salt mud is smaller than that of clear water soluble salt; the volume flow units are m 3 /h。
More specifically, the volume flow of each component in the slurry mixing treatment process satisfies the following relationship:
310*V 1 /2130≥(V 1 +V 2 +V 3 ) Solids content of 1.1
(V 1 +V 2 +V 3 ＝80～120m 3 /h)
Wherein the density of the salt slurry is about 1.1kg/L.
By means of a solution cavity calculation empirical formula, the ratios of the slurry amount, the slurry mixing water amount and the slurry mixing brine amount are repeatedly tested, so that the solid content of the grouting slurry is ensured, the effective balance of the solution cavity generated by salt extraction and the reduction of the salt slurry invasion volume of the solution cavity is ensured, meanwhile, the density of fluid is improved, the density difference of an inlet and an outlet of a brine extraction well is reduced, and the quality guarantee is provided for the effective operation of the production well, so that the slurry mixing mode has good guiding significance for waste wells and salt slurry injection wells in the production well.
Specifically, the method for performing the well injection operation comprises the following steps: adopting a well injection pump to perform well injection operation, and keeping the flow rate at 80-120 m 3 And/h, thereby ensuring that the fluid has a certain flow velocity, preventing particles from precipitating in the slurry conveying pipeline to influence slurry conveying, ensuring that the slurry enters the salt well dissolution cavity, and depositing solid particles so as to achieve the purpose of discharging halogen without carrying the slurry particles. In order to control the flow, the pressure can be controlled to be 1.3-1.8Mpa, so that the safe and stable operation of the equipment is ensured, and the flow rate and the flow velocity of the injection well are ensured. The salty mud enters rock salt mine through a vertical wellAfter the cavity is dissolved, as the fluid channel is instantaneously enlarged, the flow speed is rapidly reduced, under the action of fluid impact and well group pressure, salt mud particles flow towards the outlet direction, the particles naturally settle until the particles are static at the bottom of the cavity, and clear water starts to dissolve salt upwards until the particles are saturated, so that the dual purposes of salt mud settlement and clear water salt dissolution are achieved within the effective salt dissolving interval (about 300 m) of the brine-collecting and transporting well group.
More specifically, as the mud injection operation is easier to form salt in the brine production well than normal clear water brine production, in order to prevent the brine production well from forming salt, a set of reverse flow of the mud injection well is formulated according to the requirement of normal reverse flushing of the brine production well, namely, a conveying pipeline and a well group are required to be flushed by clear water before flushing the well group, the flushing time is about 2 hours, after flushing is completed, the reverse flushing operation is completed within 2 hours, then the mud injection operation is changed into the mud injection operation, and in the flow operation of normal mud injection, water injection flushing and reverse mud injection, the outlet pressure of a mud injection pump in the well pouring process is changed from small to large, and then from large to small, and the flow is just opposite; each pair of well groups is changed into clear water for brine production after mud injection for 1 month, and mud injection can be repeated every 3 months at intervals, so to speak, the optimization and the lifting are performed on the basis of the original well pouring operation, and the whole flow operation of the salt mud injection well can be ensured through the well pouring operation.
In a second aspect of the invention there is provided the use of the above treatment method in any one or more of the following:
a) The brine purification cost is reduced;
b) Solves the problem of salt mud treatment.
The beneficial technical effects of one or more of the technical schemes are as follows:
according to the technical scheme, the treatment method for producing the calcium magnesium salt slurry by the brine purification process is provided, calcium magnesium ions in the brine are removed in the form of precipitation such as magnesium hydroxide, calcium sulfate, calcium carbonate and the like before salt production by vacuum evaporation, brine slurry is thickened, brine is recovered, brine and clear water are added for dilution, the brine slurry is conveyed to a mining area through a slurry conveying pipeline, the brine slurry is injected into a mine through a multistage pump, the flow rate of the slurry is reduced after the slurry enters the mine, salt slurry particles are precipitated to the bottom of the mine, and unsaturated brine is returned to a production system after being saturated with dissolved salt. Through the return of the salt mud to the well, the salt mud treatment problem is fundamentally solved, the environmental pollution is avoided, and the production cost is greatly reduced. Accounting according to the million tons of salt yield, the generation of the salt mud is about 5 ten thousand tons each year, the annual saving cost is about 300 ten thousand yuan, and the method has profound effects on solving the salt mud treatment problem, thus having good practical application value.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic view of the equipment connections of a treatment process for producing calcium magnesium salt mud from brine purification according to the present invention; wherein, 1 is a T163 slurry barrel, 2 is a P163 slurry pump, 3 is a T167 slurry sedimentation barrel, 4 is a P167 slurry pump, 5 is a T160 filtrate barrel, 6 is a T168 slurry mixing barrel, and 7 is a P168 slurry pump;
FIG. 2 is a schematic diagram of the overall process for purifying brine to produce a calcium magnesium salt slurry according to the present invention; wherein 8 is a vertical well, 9 is a melting cavity, 10 is a horizontal well, 11 is a first brine pump, 12 is a second brine pump, 13 is a brine conveying pump, 14 is a fresh water tank, 15 is a brine tank, 16 is a salinization plant, and 17 is a water delivery station.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof. It is to be understood that the scope of the invention is not limited to the specific embodiments described below; it is also to be understood that the terminology used in the examples of the invention is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention.
As mentioned above, the large amount of salt mud is not proportional to the application amount of salt mud, and the salt mud is often sold, so that enterprises have to bear high treatment cost of the salt mud, thereby indirectly increasing the production cost of industrial salt.
The applicant finds that in the brine production operation of well mineral salt, after clean water enters a dissolving cavity from a vertical well, the volume becomes larger, the flow speed is reduced, the clean water with smaller density flows upwards and forwards, a salt layer is dissolved, a small amount of particle impurities in the clean water can be gradually precipitated to the bottom of the brine well, and after the clean water is operated to an inclined well, the clean water becomes saturated brine. By means of the principle of salt brine production of well and ore, salt mud slurry is conveyed into a mine, particles in the slurry flow along with liquid, the particles naturally settle to the bottom of the well, clear water in the slurry is upwards dissolved in a salt layer to be saturated, the clear water proportion is adjusted, the balance of clear water dissolved salt and salt mud occupying the salt well volume is ensured, meanwhile, well group mud injection is periodically switched, normal brine production is carried out in the process of no mud injection, salt well dissolved cavities are properly increased, safety, stability and normal operation of well groups are maintained, and the purpose of salt mud returning is achieved.
In view of the above, in an exemplary embodiment of the present invention, a treatment method for producing calcium magnesium salt mud by brine purification is provided, calcium magnesium ions are treated by brine purification process to form salt mud, the salt mud is transported to a mud bucket for temporary storage by a secondary mud pump, after complete reaction, stable mud with solid content of about 7-10% is formed, mud with monitored solid content is transported to a salt mud thickener by transportation pump, salt mud is naturally settled to the bottom in the thickener, clear liquid overflows and is recycled to a clear liquid bucket, thick mud is transported to a slurry mixing bucket by pump, brine and clear water are added, the solid content is adjusted to be within 5-10%, after sampling and monitoring are qualified, the salt mud is transported to a transportation pump and a transportation pipeline, and then well injection operation is carried out by a well injection pump, and the flow rate is kept at 80-120 m 3 And/h, ensuring that the fluid has a certain flow velocity, preventing particles from precipitating in the slurry conveying pipeline to influence slurry conveying, and ensuring that the slurry enters the salt well solution cavity to deposit solid particlesThe purpose that the halogen is discharged without carrying mud particles is achieved.
Meanwhile, during normal mud injection, the solid content and density of the fluid are relatively large, the density difference between an inlet and an outlet of brine at the outlet of the well group is relatively small, the production can be completed by carrying out small pressure during mud injection, and the flow rate of the fluid is relatively stable; when the cement injection is changed into water injection, the density difference of an inlet and an outlet is gradually increased, and the pump needs to overcome the energy consumption increase caused by the density difference, so that the pressure of the injection well is synchronously increased, and after the flushing is finished, the salt mud is poured back again to the injection well, so that the pressure is reduced from large to small.
Through regularly (through feeling the back open once every month), one of them reason is that the salt well dissolves the chamber and continues to enlarge, improves and adopts salt volume, improves economic benefits, secondly because through the water injection improvement annotate well pressure, after the high-traffic clear water annotates the well, erodees, dilutes the salt mud that gets into, prevents that salt mud from silting up at annotating well head department and influencing well group normal operating.
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention.
Example 1
After the secondary slurry is discharged into a T163 slurry barrel, the secondary slurry thoroughly reacts under the stirring action, sulfate radicals, calcium carbonate, hydroxyl radicals and calcium magnesium ions reach final balance to form magnesium hydroxide, calcium carbonate, calcium sulfate and other particles, the solid content of the slurry is 7-10% by sampling and monitoring, the slurry is conveyed into a central barrel of a thickener T167, the particles naturally settle into a slurry collecting tank along the central barrel, the particles are collected and transferred into a slurry mixing barrel T168 under the action of a stirring rake wall, supernatant in the thickener overflows through an overflow weir and is collected into a clear liquid barrel T160, thick slurry (V) 3 ) Stirring strongly in T168, adding clear water (V) 1 ) Brine (V) 2 ) The added clear water quantity needs to meet the condition that the volume of the salt mud is smaller than that of the clear water dissolved salt,
namely: 310 x V 1 /2130≥(V 1 +V 2 +V 3 ) Solids content of 1.1
(V 1 +V 2 +V 3 ＝80～120m 3 /h)
Note that: the density of the salt slurry is about 1.1kg/L.
The grouting flow table is made according to the above formula as follows:
| 40 | 90 | 7％ | 44.1 | 5.9 | m 3 /h |
| 40 | 100 | 7％ | 49.0 | 11.0 | m 3 /h |
| 40 | 110 | 7％ | 53.9 | 16.1 | m 3 /h |
| 40 | 120 | 7％ | 58.8 | 21.2 | m 3 /h |
| 40 | 90 | 8％ | 50.4 | 0 | m 3 /h |
| 40 | 100 | 8％ | 55.9 | 4.1 | m 3 /h |
| 40 | 110 | 8％ | 61.5 | 8.5 | m 3 /h |
| 40 | 120 | 8％ | 67.1 | 12.9 | m 3 /h |
by testing and adjusting the flow rate change observation, according to the followingThe well is filled by the upper flow table, the well group solution cavity is not reduced, and the returned brine clamp does not entrain salt mud, but in order to effectively balance the sodium chloride content of the well, the density of the mud filling solution is ensured to be maintained above 1.08kg/L, and V is arranged in the table 2 Below 10m 3 The flow rate of/h is not suitable for being selected so as to prevent the well group from being blocked when sudden power failure, equipment failure and other sudden conditions occur, thereby effectively ensuring the smooth proceeding of the brine mud injection well.
After the solid content is monitored to be qualified, the salt mud slurry is pressurized by a conveying pump P168, the slurry is conveyed to a mining area at a high flow rate and a long distance, after the multi-stage pump of the mining area is pressurized again and uniformly mixed, well injection operation is carried out, as clear water and brine are added, the slurry density is between the clear water and the saturated brine, the outlet of a brine production well is saturated brine, compared with the inlet pressure of a normal brine production well (outlet saturated brine) slurry injection well, the inlet pressure of the brine production well is lower than the pressure of clear water brine production, and through experimental demonstration and adjustment, the control pressure is about 1.3-1.8MPa, so that the safe and stable operation of equipment is ensured, and the flow rate of the injection well are ensured. After salt mud enters a rock salt mine dissolution cavity through a vertical well, as a fluid channel is instantaneously enlarged, the flow speed is rapidly reduced, salt mud particles flow towards an outlet direction under the action of fluid impact and well group pressure, the particles naturally settle until the particles are settled at the bottom of the dissolution cavity, clear water starts to dissolve salt upwards until the salt is saturated, and the dual purposes of salt mud settlement and clear water salt dissolution are achieved within the effective salt dissolution interval (about 300 m) of a brine-producing well group.
Because the mud injection operation is easier to form salt compared with normal clear water brine production, the brine production well is easier to form salt, a set of mud injection well pouring flow is established according to the normal brine production well pouring requirement, namely, the flushing time is about 2 hours before pouring the well group, the flushing time is about 2 hours, the pressure change of the well group is required to be paid attention to in the flushing process, the flushing is not thorough, the equipment operation fault is prevented, the mud pouring operation is completed within 2 hours after the flushing is completed, the mud injection operation is changed into the mud injection operation, the outlet pressure of the mud injection pump in the well pouring process is changed from small to big and the flow is just opposite in the normal mud injection-water injection flushing-mud pouring flow operation. Each pair of well groups is changed into clear water for brine production after mud injection for 1 month, the company 4 can participate in the well injection, each pair of well groups can repeatedly inject mud every 3 months, so to speak, the optimization and the lifting are carried out on the basis of the original well pouring operation, and the whole flow operation of the salt mud injection well can be ensured through the well pouring operation.
It should be noted that the above examples are only for illustrating the technical solution of the present invention and are not limiting thereof. Although the present invention has been described in detail with reference to the examples given, those skilled in the art can make modifications and equivalents to the technical solutions of the present invention as required, without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A method of treating brine purification to produce a calcium magnesium salt slurry, the method comprising: stirring the generated salt mud slurry to react to form stable salt mud slurry, carrying out layered sedimentation on the stable salt mud slurry to obtain supernatant and thick mud, adding brine and clear water into the thick mud slurry to carry out slurry mixing treatment, controlling the solid content to be 5-10%, and carrying out well injection operation on the thick mud slurry;
the salt mud is obtained after being treated by a brine purification process;
the solid content of the stable salt mud slurry is controlled to be 7-10%;
the layered sedimentation is carried out in the thickener, so that salt mud particles naturally sediment to the bottom in the thickener to obtain thick mud; collecting supernatant as brine for reuse;
the concrete operation method of the size mixing treatment comprises the following steps: adding clear water and brine into thick slurry, wherein the adding amount of the clear water is required to meet the condition that the volume of the salt slurry is smaller than that of clear water dissolved salt; the volume flow of thick mud is V 3 The volume flow of clear water is V 1 The brine volume flow is V 2 The volume flow of each component in the slurry mixing treatment process meets the following relationship:
310*V 1 /2130≥（V 1 +V 2 +V 3 ) Solids content, V1.1 1 +V 2 +V 3 =80~120m³/h；
The method for performing the well injection operation comprises the following steps: and (3) performing well injection operation by adopting a well injection pump, keeping the flow rate at 80-120 m/h, and controlling the pressure at 1.3-1.8Mpa.
2. The method of treating of claim 1, wherein during the well injection operation, a well flushing operation is performed periodically on the mud injection well.
3. The method of treatment of claim 2, wherein the injection well is subjected to a monthly back flushing operation.
4. The method of treating as claimed in claim 2, wherein flushing the transfer pipe and well group with clear water is performed before flushing the well group, and after flushing, flushing the well is performed, and after flushing, the well is changed to cementing.
5. Use of the treatment method of any one of claims 1-4 in any one or more of the following:
a) The brine purification cost is reduced;
b) And (5) salt mud treatment.
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| CN102587979B (en) * | 2012-01-19 | 2014-06-25 | 湖北双环科技股份有限公司 | Method for treating salty mud generated in rock salt solution mining sodium sulfate type brine purification |
| CN107363067B (en) * | 2016-05-11 | 2020-08-04 | 江苏苏盐井神股份有限公司 | Method for storing industrial waste liquid and waste residues by utilizing rock salt dissolving cavity |
| CN109437244A (en) * | 2018-12-05 | 2019-03-08 | 安徽华塑股份有限公司 | The method of the calcium and magnesium salt slurry perfusion molten chamber of halogen well |
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| CN103343680A (en) * | 2013-06-28 | 2013-10-09 | 湖南省湘衡盐化有限责任公司 | Brine-mud backfilling method |
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