Study on Novel Technology of Copper Dross Smelting with Soda-lead Concentrate;

Design of injection mould for cock with spiral ejection pin;

The advantage of stopcock used as pitch valve;

To introduce the practical application of numerical control lathe in machining cock valves and cylinder valves,to provide the detailed numerical control machining program.

Study on synthesis of sodium bicarbonate by double decomposition method;

Novel process for sodium bicarbonate preparation by low-temperature synthesis;

Status quo of sodium bicarbonate production in China and its development proposals;