JPH0417235Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a sea sand desalination device used for reinforced concrete buildings, civil engineering foundation concrete, etc.

(Prior Art) In recent years, reinforced concrete buildings, civil engineering foundation concrete, etc. have been attacked by salt, which has become a major social problem. For this reason, recently, in order to reduce the salt concentration of the sea sand in the concrete used to the specified regulatory value, for example, fresh water is sprayed from above onto the sea sand accumulated in a collection site, or a machine is used to reduce the salt concentration of the sea sand. Methods such as washing and desalinating in fresh water pools are being used.

(Problem that the invention aims to solve) However, the above method of spraying fresh water onto the sea sand from above desalinates only the surface of the sea sand, making it difficult for fresh water to penetrate into the inside of the sea sand. It was impossible to reduce the salinity of all the sea sand to a predetermined level. In addition, the method of desalinating sea sand by washing it in a pool of fresh water using a machine requires a large amount of fresh water, and the salt concentration in the sand after desalination may vary locally.
Not only that, but because it is mechanical, it also washes away the fine sand contained in the sea sand along with the washing drainage liquid.
There were drawbacks such as extremely poor collection and recovery rate of sea sand.

The present invention has been developed in view of the above-mentioned drawbacks, and has been developed to automatically control the amount of fresh water for cleaning to maintain sea sand at a predetermined salinity concentration, and to install the fresh water sprinkling device in the cleaning and classification tank section. By installing it above the dewatering zone, it is possible to reliably lower the salt concentration in the sand after washing and desalination to below the predetermined salt concentration.
In addition, a sedimentation and septic tank section is installed behind the washing and classification tank section to purify the washing wastewater to below the specified wastewater standard value, and a chain conveyor with scrapers is installed to increase the collection and recovery rate of desalinated sea sand. The purpose of this project is to obtain a sea sand desalination device that can perform the following steps.

(Means for Solving the Problems) As a means to achieve this, the present invention provides a sedimentation septic tank section that is connected to a cleaning and classification tank section that is inclined at an appropriate angle with respect to the horizontal, and a sedimentation septic tank section that is connected to the washing and classification tank section and the sedimentation septic tank section. A chain conveyor with a scraper plate is rotatably provided in the sedimentation septic tank section, an overflow gutter and a collection gutter are provided in the sedimentation septic tank section, and a sea sand input chute is provided in the upper part of the washing and classification tank section. A fresh water sprinkler is installed above the slope dewatering zone of the tank and at the sea sand input chute, and a salinity detector and a salinity indicator controller are also installed. The opening of the water injection valve is automatically controlled.

(Example) An example in which a specific configuration of the present invention is shown in the drawings will be described in detail below. Code 1 is about horizontal
The cleaning and classification tank section tilted at an angle of 18° to 20°, reference numeral 2 is a sedimentation septic tank section connected to the cleaning and classification tank section 1, and the cleaning and classification tank section 1 and sedimentation septic tank section 2 are equipped with dewatering holes. A chain conveyor 4 having a plate 3 is rotatably attached, a partition wall 5 is provided between the cleaning and classification tank section 1 and the sedimentation septic tank section 2, and an overflow gutter 6 and a collection gutter 7 are installed in the sedimentation septic tank section 2. .
Further, a sea sand input chute 8 is provided in the upper part of the cleaning and classification tank section 1, and a fresh water inlet 11' for cleaning is provided near the tip of the input chute 8. In addition, fresh water 10
A water sprinkling device 11 is provided, and a dewatering net 12 and a washing sand discharge chute 13 are also provided on the slope of the dewatering zone portion 9. Furthermore, a salinity concentration detector 14 is installed in the cleaning and classification tank section 1, and a salinity concentration indicating controller 15 is installed above it. The salinity concentration detected by the salinity concentration detector 14 is sent as an electric signal to the salinity concentration indicating controller 15, where an opening command is issued to the fresh water injection valve 16 of the fresh water injector to determine the opening degree of the fresh water injection valve 16. has come to be controlled.

Next, the sea sand desalination work according to the present invention will be explained. When sea sand is put into the input chute 8, the opening of the fresh water injection valve 16 is adjusted by the salinity detector 14 and the salinity indicator controller 15, and the fresh water injection valve is used to maintain the sea sand at a predetermined salinity. Since the amount of water is injected, the salinity of the sea sand is lowered to a predetermined salinity. The sea sand whose salinity has been lowered to a predetermined concentration is transferred to the dewatering zone section 9 by the scraper plate 3 of the chain conveyor 4, and is then transported to the dewatering zone section 9 by the water spraying device 11 installed in the upper part of the dewatering zone section 9. 1
1 is poured into the sea sand to maintain the salt concentration of the sea sand below a predetermined salt concentration. The sea sand maintained at a salinity below a predetermined concentration is drained through a dewatering net 12 and discharged to the outside from a discharge chute 13.
On the other hand, when the sea sand introduced from the input chute 8 is washed and desalinated in the washing and classification tank section 1, the washing water used in the washing and classification tank section 1 flows through the upper and lower parts of the partition wall 5 while still containing fine sea sand particles. It flows into the sedimentation septic tank 2. The cleaning water that has flowed into the sedimentation septic tank section 2 rises in the tank 2 in a uniform water flow, and the fine particles of sea sand mixed in the cleaning water settle into the sedimentation septic tank section 2. The rising washing water is then sent to the sedimentation septic tank section 2.
It flows out to the outside through several overflow gutter 6 and collection gutter 7 installed at equal intervals on the upper part of the tank. Further, the fine sea sand particles that have settled in the sedimentation septic tank section 2 are transferred by the scraper plate 3 of the chain conveyor and are discharged from the discharge chute 13 as washed sand.

(Effects of the invention) As described above in detail with respect to the embodiments, the present invention is equipped with a salinity detector and a salinity indicator controller, and automatically controls the opening of the fresh water injection valve based on the electrical signal from the salinity detector. As a result, sea sand can be maintained at a specified salinity concentration with the minimum amount of fresh water required.In addition, the fresh water sprinkler is installed above the dewatering zone of the cleaning and classification tank, which improves cleaning and classification. The salt concentration in the sand after desalination can be reliably lowered to below the specified salt concentration, and the collection and recovery rate of desalinated sea sand can be improved by installing a sedimentation and septic tank section behind the cleaning and classification tank section. It has excellent effects such as being able to increase the

[Brief explanation of the drawing]

FIG. 1 is a schematic view of the main parts of the sea sand desalination apparatus of the present invention, and FIG. 2 is a plan view of the main parts of the sea sand desalination apparatus of the present invention. 1...Cleaning classification tank section, 2...Sedimentation septic tank section, 3
...Scraping board, 4...Chain conveyor, 6...Overflow gutter, 7...Collection gutter, 8...Input chute, 9...
... Slope dewatering zone part, 10 ... Fresh water, 11 ... Water sprinkler, 14 ... Salinity concentration detector, 15 ... Salinity concentration indicator controller, 16 ... Fresh water injection valve.

Claims (1)

[Scope of utility model registration request] A settling septic tank section is connected to a washing and classifying tank section inclined at an appropriate angle with respect to the horizontal, and a chain conveyor having a scraper is rotatably attached to the washing and classifying tank section and the settling septic tank section, and a In addition to providing an overflow gutter and a collection gutter, a sea sand input chute is installed above the cleaning and classification tank, and fresh water is sprinkled above the slope dewatering zone of the cleaning and classification tank and at the sea sand input chute. A sea sand desalination system with a wastewater purification mechanism is equipped with a salinity detector and a salinity indicator controller, and the opening of the fresh water injection valve is automatically controlled by the electric signal from the salinity detector. Device.