An automated production system for producing sodium fluoroaluminate crystals using hydrofluoric acid solution.

Abstract

This invention provides an automated production system for producing sodium fluoroaluminate crystals using hydrofluoric acid solution. The system includes a reaction module, a feeding module, and an automatic control module. The feeding module comprises a hydrofluoric acid tank, a hydrofluoric acid feed pipe, a hydrofluoric acid valve, an aluminate solution tank, an aluminate solution feed pipe, an aluminate solution valve, a sodium-containing solution tank, a sodium-containing solution feed pipe, and a sodium-containing solution valve. The automatic control module controls the hydrofluoric acid valve, the aluminate solution valve, the sodium-containing solution valve, or combinations thereof. Through the aforementioned technical means, this invention effectively reuses hydrofluoric acid solution with a simple operation and high throughput per unit time, obtaining sodium fluoroaluminate crystals with high economic value, and solving the problem of unstable quality of the recovered product.

Claims

1. An automated production system for producing sodium fluoroaluminate crystals using hydrofluoric acid solution, comprising: a reaction module having a reaction tank; a feeding module having: a hydrofluoric acid tank, a hydrofluoric acid feed pipe, and a hydrofluoric acid valve, wherein the hydrofluoric acid tank is connected to the reaction tank via the hydrofluoric acid feed pipe, and the hydrofluoric acid valve is disposed between the upstream and downstream sides of the hydrofluoric acid feed pipe; an aluminate solution tank, an aluminate solution feed pipe, and an aluminate solution valve, wherein the aluminate solution tank is connected to the reaction tank via the aluminate solution feed pipe, and the aluminate solution valve is disposed between the upstream and downstream sides of the aluminate solution feed pipe; and a sodium-containing solution tank, a sodium-containing solution feed pipe, and a sodium-containing solution valve, wherein the sodium-containing solution tank is connected to the reaction tank via the sodium-containing solution feed pipe, and the sodium-containing solution valve is disposed between the upstream and downstream sides of the sodium-containing solution feed pipe. An automatic control module that controls the hydrofluoric acid valve, the aluminate solution valve, the sodium-containing solution valve, or a combination thereof.

2. The automated production system as described in claim 1, wherein an underflow outlet is provided at the bottom of the reaction tank.

3. The automated production system as described in claim 2, wherein the automated production system includes a circulation module having a reflux pipe, a delivery valve, and an analyzer; the reflux pipe having an opposite suction end and a delivery end, the suction end being connected to the underflow port of the reaction tank, the delivery end extending to the upper part of the reaction tank; the delivery valve and the analyzer being disposed between the suction end and the delivery end of the reflux pipe; the automatic control module being electrically connected to the analyzer and receiving fluoride ion concentration parameters and pH parameters from the analyzer to control the aluminate solution valve, the sodium-containing solution valve, or a combination thereof.

4. The automated production system as claimed in claim 3, wherein the circulation module has a discharge valve, the return pipe has a discharge end located at the end of a branch pipe on the return pipe between the suction end and the delivery end, and the discharge valve is disposed between the suction end and the discharge end of the return pipe; the automatic control module controls the discharge valve to discharge a discharge liquid through the discharge end of the return pipe.

5. The automated production system as claimed in claim 1, wherein the feeding module includes a hydrofluoric acid pump, an aluminate solution pump and a sodium-containing solution pump, the hydrofluoric acid pump being disposed between the upstream and downstream sides of the hydrofluoric acid feed pipe, the aluminate solution pump being disposed between the upstream and downstream sides of the aluminate solution feed pipe, and the sodium-containing solution pump being disposed between the upstream and downstream sides of the sodium-containing solution feed pipe.

6. The automated production system as described in claim 1, wherein the feeding module has a fluoride ion concentration sensor disposed on the hydrofluoric acid tank, and the sensing end of the fluoride ion concentration sensor extends into the interior of the hydrofluoric acid tank; the automatic control module is electrically connected to the fluoride ion concentration sensor to receive the fluoride ion concentration parameter from the fluoride ion concentration sensor and control the hydrofluoric acid valve.

7. The automated production system as claimed in claim 1, wherein the feeding module has a first nozzle, a second nozzle and a third nozzle, the first nozzle being disposed downstream of the hydrofluoric acid feed pipe, the second nozzle being disposed downstream of the aluminate solution feed pipe, and the third nozzle being disposed downstream of the sodium-containing solution feed pipe.

8. The automated production system as described in claim 1, wherein the feeding module has a first sensor, a second sensor, and a third sensor, the first sensor being disposed between the upstream and downstream sides of the hydrofluoric acid feeding pipe, the second sensor being disposed between the upstream and downstream sides of the aluminate solution feeding pipe, and the third sensor being disposed between the upstream and downstream sides of the sodium-containing solution feeding pipe; the automatic control module is electrically connected to the first sensor, the second sensor, and the third sensor to receive the feeding flow rate parameters of the first sensor, the second sensor, the third sensor, or a combination thereof from the first sensor, the second sensor, the third sensor, or a combination thereof.

9. The automated production system as described in claim 1, wherein the reaction module has a temperature sensor and a cooling device, the temperature sensor being disposed on the reaction tank and the sensing end of the temperature sensor extending into the interior of the reaction tank; the cooling device having a cooling element, a cooling water return pipe, a cooling system, a cooling water valve and a cooling water pump, the cooling element being disposed on the inner wall of the reaction tank, the upstream side of the cooling water return pipe being connected to the cooling element at the top of the inner wall of the reaction tank, the downstream side of the cooling water return pipe being connected to the cooling element at the bottom of the inner wall of the reaction tank, the cooling system, the cooling water valve and the cooling water pump being disposed between the upstream and downstream sides of the cooling water return pipe, and the automatic control module being electrically connected to the temperature sensor and the cooling water valve to receive the temperature of the reaction solution measured by the temperature sensor and control the opening or closing of the cooling water valve.

10. The automated production system as claimed in claim 1, wherein the reaction module has a stirring unit disposed on the reaction tank.

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