CN105858964A - Tailing mud water treatment method for wet coal preparation plant - Google Patents
Tailing mud water treatment method for wet coal preparation plant Download PDFInfo
- Publication number
- CN105858964A CN105858964A CN201610326763.4A CN201610326763A CN105858964A CN 105858964 A CN105858964 A CN 105858964A CN 201610326763 A CN201610326763 A CN 201610326763A CN 105858964 A CN105858964 A CN 105858964A
- Authority
- CN
- China
- Prior art keywords
- section
- tail coal
- treatment method
- coal
- thickener
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- 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
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a tailing mud water treatment method for a wet coal preparation plant. A two-stage concentration and two-stage recycling method for tailing mud water is involved in the method, and the method comprises the following steps: acquiring a hardness value of the tailing mud water; when the hardness value of the tailing mud water is lower than a first threshold value, adding a flocculating agent into a first-stage concentrator; acquiring an overflow concentration value of a first-stage concentrator; when the overflow concentration value of the first-stage concentrator is higher than a second threshold value, adding the flocculating agent into the first-stage concentrator; when the overflow concentration value of the first-stage concentrator is not higher than the second threshold value, reusing the overflow of the first-stage concentrator as circulating water. According to the method, the charging rate of a sedimentation-filtration centrifugal dehydrator can be maximally increased, the charging rate of a tailing mud filter press and the charging rate of the second-stage concentrator can be correspondingly decreased, and the aims of reducing the factory construction investment, improving the tailing mud recycling efficiency and saving coal and water resources can be fulfilled.
Description
Technical field
The invention belongs to wet coal preparation factory tail coal Slurry treatment technical field, particularly relate to a kind of wet coal preparation
Factory's tail coal Slurry treatment method.
Background technology
Tail coal Slurry treatment is one of wet coal preparation factory of China long-standing production technology difficult problem, traditional list
Section concentrates single hop recovery process, causes that coal preparation plant's washing wastewater is high, arranges outside a large amount of tail coal muddy water, makes
Become coal and the serious waste of water resource and the heavy damage of environment；Additionally when fine fraction content height in tail coal mud
Time, tail coal filter press load increases, and the press filtration cycle is long, and filter cake moisture is high, and capital expenditure is high.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of wet coal preparation factory tail coal mud
Method for treating water.
The technical scheme is that a kind of wet coal preparation factory tail coal Slurry treatment method, the method mainly makes
Equipment include one section of thickener, two sections of thickeners, sieve bend, screen-bowl centrifuge and tail
Coal filter press, the method relates to the concentration of two sections of tail coal muddy water, two-stage recovery technique, including:
Obtain described tail coal muddy water hardness number；
When described tail coal muddy water hardness number is less than first threshold, in described one section of thickener, add cohesion
Agent；
Obtain one section of thickener overflow concentration value；
When described one section of thickener overflow concentration value is higher than Second Threshold, add in described one section of thickener
Flocculant；When described one section of thickener overflow concentration is not higher than Second Threshold, described one section of thickener overflow
As recirculated water multiplexing.
Preferably, described first threshold is with CaCO3It is calculated as 450mg/L.
Preferably, described Second Threshold is 2.0g/L.
Preferably, described flocculant includes polyacrylamide.
Preferably, described flocculating agent includes calcium chloride or magnesium chloride.
Advantages of the present invention and having the beneficial effects that: add medicament in one section of thickener pan feeding and (add flocculation
Agent, or add flocculant and flocculating agent), make tail coal mud enter underflow to greatest extent, big by disposal ability,
The screen-bowl centrifuge that product moisture is low, electrical energy consumption per tonne of raw coal is relatively low reclaims, and is greatly decreased two sections
Thickener feeding, reduces tail coal filter press live load, reduces press filteration system and two sections of thickeners are invested into
This.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, describe below
In accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not paying
On the premise of going out creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of an embodiment of the present invention.
Detailed description of the invention
With embodiment, the detailed description of the invention of the present invention is further described below in conjunction with the accompanying drawings, below implements
Example is only used for clearly illustrating technical scheme, and can not limit the protection of the present invention with this
Scope.
As it is shown in figure 1, be the schematic flow sheet of an embodiment of the present invention, a kind of wet coal preparation factory tail coal mud
Water treatment system, is mainly made up of one section of concentration, one section of recovery, two sections of concentrations, two sections of recovery 4 procedures.
One section of concentration: wet coal preparation factory tail coal muddy water enters one section of thickener to carry out concentrating operation.Obtain described
Tail coal muddy water hardness number, when described tail coal muddy water hardness number ＜ 450mg/L is (with CaCO3Meter, i.e. 25.2
Germany's degree) time, in described one section of thickener, add flocculating agent (as shown in A in figure)；When described tail coal mud
Hydraulic angle value >=450mg/L is (with CaCO3Meter, i.e. 25.2 Germany's degree) time, then need not add.
The flocculating agent of the present embodiment preferably uses the inorganic electrolyte of the calcic such as calcium chloride, magnesium chloride, magnesium ion
Matter.
Obtain one section of thickener overflow concentration value, as described one section of thickener overflow concentration value ＞ 2.0g/L,
Flocculant (as shown in A in figure) is added in described one section of thickener.Under the effect of medicament, tail coal mud
Accelerated subsidence, completes solid, liquid and separates.Tail coal mud major part is settled down to one section of thickener underflow, thus obtains
Peace and quiet overflow.
In the present embodiment, flocculant is high molecular polymer, preferably can select polyacrylamide, the most excellent
Selection anionic, degree of hydrolysis about 33%, the molecular weight polypropylene between 600～10,000,000 of choosing
Acid amides.
As one section of thickener overflow concentration≤2.0g/L, system multiplexing can be returned to (in figure as recirculated water
Shown in B)；As one section of thickener overflow concentration ＞ 2.0g/L, then enter two sections of thickeners (such as C in figure
Shown in).
One section of recovery: one section of thickener underflow enters sieve bend, and coal in the incorporation of sieve bend on-the-sieve material, under sieve
Material enters screen-bowl centrifuge and carries out dehydration recovery.The dehydration of screen-bowl centrifuge
Product is relatively low and loose due to moisture, coal in can mixing, screen-bowl centrifuge centrifugate,
Filtrate enters two sections of thickeners.
Two sections of concentrations: add medicament at two sections of thickeners and (add flocculant, or add flocculant and cohesion
Agent), make tail coal mud Accelerated subsidence, two sections of thickener underflows enter tail coal filter press, the overflow of degree of depth clarification
System multiplexing is returned to as recirculated water.
Two sections of recovery: two sections of thickener underflows are reclaimed by tail coal filter press, it is achieved separation of solid and liquid, tail coal press filtration
Machine filter liquid returns to system multiplexing as recirculated water.
The present invention can provide a kind of novel two sections of concentrations being applicable to wet coal preparation factory tail slurry circulating system
Two-stage recovery technique, it is intended to increase the feeding of screen-bowl centrifuge, slow down tail coal filter press work
Make load, reduce capital expenditure；Shorten tail coal mud recovery time, improve operating efficiency.
The filter cake moisture of tail coal filter press output is high, and tacky agglomerating, only as cheap low calorie fuels,
Market goods locally.The dehydration product moisture of screen-bowl centrifuge is low and loose, can mix power cleaned coal
In (middle coal), as power plant coal.Both sell price difference big, after implementing this patent, can optimize
The product structure of coal preparation plant, increases the performance of enterprises.
The above is only the preferred embodiments of the present invention, it is noted that common for the art
For technical staff, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and profit
Decorations, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (5)
1. a wet coal preparation factory tail coal Slurry treatment method, the equipment that the method mainly uses include one section dense
Contracting machine, two sections of thickeners, sieve bend, screen-bowl centrifuge and tail coal filter press, the method relates to
And the concentration of two sections of tail coal muddy water, two-stage recovery technique, it is characterised in that including:
Obtain described tail coal muddy water hardness number；
When described tail coal muddy water hardness number is less than first threshold, in described one section of thickener, add cohesion
Agent；
Obtain one section of thickener overflow concentration value；
When described one section of thickener overflow concentration value is higher than Second Threshold, add in described one section of thickener
Flocculant；When described one section of thickener overflow concentration is not higher than Second Threshold, described one section of thickener overflow
As recirculated water multiplexing.
Wet coal preparation factory the most according to claim 1 tail coal Slurry treatment method, it is characterised in that
Described first threshold is with CaCO3It is calculated as 450mg/L.
Wet coal preparation factory the most according to claim 1 tail coal Slurry treatment method, it is characterised in that
Described Second Threshold is 2.0g/L.
4. according to the wet coal preparation factory tail coal Slurry treatment method one of claim 1-3 Suo Shu, its feature
Being, described flocculant includes polyacrylamide.
Wet coal preparation factory the most according to claim 4 tail coal Slurry treatment method, it is characterised in that
Described flocculating agent includes calcium chloride or magnesium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610326763.4A CN105858964B (en) | 2016-05-17 | 2016-05-17 | A kind of wet coal preparation factory tail coal Slurry treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610326763.4A CN105858964B (en) | 2016-05-17 | 2016-05-17 | A kind of wet coal preparation factory tail coal Slurry treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105858964A true CN105858964A (en) | 2016-08-17 |
| CN105858964B CN105858964B (en) | 2019-01-25 |
Family
ID=56634263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610326763.4A Active CN105858964B (en) | 2016-05-17 | 2016-05-17 | A kind of wet coal preparation factory tail coal Slurry treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105858964B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106237708A (en) * | 2016-09-23 | 2016-12-21 | 苏州三体智能科技有限公司 | A kind of Coal Preparation Plant coal slime dewatering system and method |
| CN106933099A (en) * | 2017-03-06 | 2017-07-07 | 太原理工大学 | A kind of coal preparation plant's thickener and filter press medicament addition cooperative control system |
| CN107213982A (en) * | 2017-07-27 | 2017-09-29 | 中国神华能源股份有限公司 | Duff mud treatment system and fine coal slurry processing method |
| CN107597412A (en) * | 2017-09-21 | 2018-01-19 | 淮南矿业(集团)有限责任公司 | One kind drift mud recovery system |
| CN110194516A (en) * | 2019-06-19 | 2019-09-03 | 重庆长能环境科技有限公司 | It is a kind of handle black water flocculant and its application and slime water treatment method |
| CN111635035A (en) * | 2020-06-09 | 2020-09-08 | 欧战备 | Coking coal tailing slurry treatment method and dosing device thereof |
| CN112536159A (en) * | 2020-11-20 | 2021-03-23 | 四川广旺能源发展（集团）有限责任公司唐家河煤矿 | Flotation tailing coal slime secondary concentration recovery process |
| CN113024080A (en) * | 2021-03-05 | 2021-06-25 | 北京科技大学 | Full-tailing slurry two-section type continuous, rapid and deep dewatering system |
| CN115745228A (en) * | 2022-10-25 | 2023-03-07 | 唐山国华科技国际工程有限公司 | System and method for improving feed concentration of sedimentation filtration type centrifugal dehydrator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29716950U1 (en) * | 1997-09-22 | 1997-11-27 | Reiflock Abwassertechnik Gmbh | Device for inoculating sludge with polymers for subsequent dewatering of the sludge |
| CN1792830A (en) * | 2005-10-21 | 2006-06-28 | 赵树彦 | Tech. for treating coal mud water by tow section concentration, tow section recovery |
| CN1948434A (en) * | 2006-11-10 | 2007-04-18 | 张春林 | Two stage dewatering technology of fine coal mud |
-
2016
- 2016-05-17 CN CN201610326763.4A patent/CN105858964B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29716950U1 (en) * | 1997-09-22 | 1997-11-27 | Reiflock Abwassertechnik Gmbh | Device for inoculating sludge with polymers for subsequent dewatering of the sludge |
| CN1792830A (en) * | 2005-10-21 | 2006-06-28 | 赵树彦 | Tech. for treating coal mud water by tow section concentration, tow section recovery |
| CN1948434A (en) * | 2006-11-10 | 2007-04-18 | 张春林 | Two stage dewatering technology of fine coal mud |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106237708A (en) * | 2016-09-23 | 2016-12-21 | 苏州三体智能科技有限公司 | A kind of Coal Preparation Plant coal slime dewatering system and method |
| CN106933099A (en) * | 2017-03-06 | 2017-07-07 | 太原理工大学 | A kind of coal preparation plant's thickener and filter press medicament addition cooperative control system |
| CN106933099B (en) * | 2017-03-06 | 2019-12-10 | 太原理工大学 | Coal preparation plant thickener and filter press medicament adding cooperative control system |
| CN107213982A (en) * | 2017-07-27 | 2017-09-29 | 中国神华能源股份有限公司 | Duff mud treatment system and fine coal slurry processing method |
| CN107597412A (en) * | 2017-09-21 | 2018-01-19 | 淮南矿业(集团)有限责任公司 | One kind drift mud recovery system |
| CN110194516A (en) * | 2019-06-19 | 2019-09-03 | 重庆长能环境科技有限公司 | It is a kind of handle black water flocculant and its application and slime water treatment method |
| CN111635035A (en) * | 2020-06-09 | 2020-09-08 | 欧战备 | Coking coal tailing slurry treatment method and dosing device thereof |
| CN111635035B (en) * | 2020-06-09 | 2022-04-26 | 欧战备 | Coking coal tailing slurry treatment method and dosing device thereof |
| CN112536159A (en) * | 2020-11-20 | 2021-03-23 | 四川广旺能源发展（集团）有限责任公司唐家河煤矿 | Flotation tailing coal slime secondary concentration recovery process |
| CN113024080A (en) * | 2021-03-05 | 2021-06-25 | 北京科技大学 | Full-tailing slurry two-section type continuous, rapid and deep dewatering system |
| CN115745228A (en) * | 2022-10-25 | 2023-03-07 | 唐山国华科技国际工程有限公司 | System and method for improving feed concentration of sedimentation filtration type centrifugal dehydrator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105858964B (en) | 2019-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105858964A (en) | Tailing mud water treatment method for wet coal preparation plant | |
| CA2359235A1 (en) | Rheology modification of settled solids in mineral processing | |
| CN1792830A (en) | Tech. for treating coal mud water by tow section concentration, tow section recovery | |
| CN103058253A (en) | Method for preparing gypsum by free sulfuric acid in titanium dioxide wastewater | |
| CN204079743U (en) | A kind of Technique of Coal Mine Drainage sludge treatment equipment | |
| CN109867386A (en) | A kind of waterborne moveable mud conditioning device and treatment process | |
| CN104162479A (en) | Movable sieve waste rock discharge system slime water treatment process and device | |
| CN103755075A (en) | Technical method for treating silicon carbide acidic wastewater | |
| CN106395775A (en) | Method for filtering phosphoric acid extraction slurry | |
| CN107840488A (en) | Washed-out sand muddy water device for cleansing and recycling and method | |
| CN102500472A (en) | Concentrating, filtering and dehydrating process for flotation clean coal | |
| CN104069936A (en) | Coal slime water treatment process of mine water coal | |
| CN106480311A (en) | A kind of Uranium extraction solid-liquid separation on ore pulp method | |
| CN109107753A (en) | A kind of method of bauxite washup tailing sludge dehydration | |
| CN105293867A (en) | Sludge dewatering and concentration treatment fundamental technology | |
| CN204752411U (en) | System sand hydrologic cycle clean system | |
| CN104129838A (en) | Settlement method of vanadium mud in leached vanadium liquid | |
| CN209442766U (en) | Defeated coal coal-contained wastewater processing transformation device | |
| CN110835120A (en) | Efficient acidolysis process for titanium concentrate | |
| CN110590122A (en) | Method for circularly applying sludge wastewater to sludge dewatering | |
| CN102872645A (en) | Long-distance pipeline coal conveying terminal dehydration system device and dehydration method | |
| CN201324569Y (en) | Steel tailing mud treating system | |
| CN202576132U (en) | System for closed cyclic utilization of cinder flushing water in sulfuric acid preparation | |
| CN103771626B (en) | Reactor for integrally treating deeply-dehydrated sludge water and concentrated and dehydrated sludge water | |
| CN102897950A (en) | Method for treating coal slurry water at long-distance pipeline coal transporting terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230602 Address after: 063000 No.8, Beihuan West Road, high tech Zone, Tangshan City, Hebei Province Patentee after: TANGSHAN GUOHUA TECHNOLOGY INTERNATIONAL ENGINEERING Co.,Ltd. Address before: 101300 7 Juyuan West Road, Mapo Town, Shunyi District, Beijing Patentee before: BEIJING GUOHUA TECHNOLOGY Group Ltd. |