A system comprising a remote operation and control sub-system and a pressure filter for solid-liquid separation and filtering materials containing a caustic chemical gas, wherein the remote operation and control sub-system comprises: a GPRS-DTU communication network provided in the pressure filter; a PLC controller provided in the pressure filter and connected to the GPRS-DTU communication network, wherein the PLC controller is configured to perform filtering procedure of the pressure filter; a signal antenna provided for the GPRS-DTU communication network, wherein the antenna communicates with a communication tower; a GGSN communication interface and an SGSN communication interface, which form a GPRS communication network, wherein a signal from the communication tower is transmitted to the GPRS communication network and the GPRS communication network utilizes GPRS Access Point Name, APN; a router connected to the GPRS communication network, wherein the signal is transmitted from a connection port of the GPRS communication network to the router; a firewall connected to the router and a switch connected to the firewall, wherein the signal is transmitted to the firewall via the router and then to the switch; a data center server receiving data contained in the signal from the firewall and sending instructions for controlling the PLC controller, wherein the data comprises interface parameters including Baud rate, stop bit, odd-even check, data bit and flow control of the PLC controller; an industrial Ethernet connected to the switch, wherein a computer in the industrial Ethernet is connected to the switch and a PLC control system and the computer receives the data from the data center server and provides a human-machine interface for monitoring the PLC controller, and a fiber transceiver connected to the switch and the PLC control system. a GPRS-DTU communication network provided in the pressure filter; a PLC controller provided in the pressure filter and connected to the GPRS-DTU communication network, wherein the PLC controller is configured to perform filtering procedure of the pressure filter; a signal antenna provided for the GPRS-DTU communication network, wherein the antenna communicates with a communication tower; a GGSN communication interface and an SGSN communication interface, which form a GPRS communication network, wherein a signal from the communication tower is transmitted to the GPRS communication network and the GPRS communication network utilizes GPRS Access Point Name, APN; a router connected to the GPRS communication network, wherein the signal is transmitted from a connection port of the GPRS communication network to the router; a firewall connected to the router and a switch connected to the firewall, wherein the signal is transmitted to the firewall via the router and then to the switch; a data center server receiving data contained in the signal from the firewall and sending instructions for controlling the PLC controller, wherein the data comprises interface parameters including Baud rate, stop bit, odd-even check, data bit and flow control of the PLC controller; an industrial Ethernet connected to the switch, wherein a computer in the industrial Ethernet is connected to the switch and a PLC control system and the computer receives the data from the data center server and provides a human-machine interface for monitoring the PLC controller, and a fiber transceiver connected to the switch and the PLC control system. <EOS>