Due to the large power consumption of cadmium produced by electrowinning, many factories have changed the electrowinning method to the replacement method.

The electric zinc plant of the American Smelting and Refining Company originally used the electrowinning method to treat the cadmium residue from the second stage of zinc production to produce cadmium. Now it is replaced by the replacement method. The process flow is shown in Figure 1.

Figure 1 Process for the production of cadmium from cadmium slag by US smelting and refining companies

The Finnish Kokkola Electric Zinc Plant uses the second stage of purification to produce cadmium slag to produce cadmium, which is also used in the displacement process. The composition of cadmium slag treated by Kokkola Electric Zinc Plant is as follows: No. 1 15%~25% Cd, about 1% Cu, 0.05% Co, 0.005%~0.05% Ni, 60% Zn; No. 2 22.4% Cd, 0.7% Cu , 54.5% Zn.

MITSUBISHI VVT SOLENOID

Variable valve timing (VVT) solenoid or oil control valve controls the oil flow according to the engine speed and load. VVT solenoid is a vital part of the variable valve timing system.
The Oil Control Valve (OCV) is a a critical part used in every engine that is fitted with variable valve technology (VVT). A single control valve will regulate the supply of oil to a designated VVT hub, to advance or retard the timing by altering the camshaft angle position. Controlled by the ECU, the OCV receives electrical signals, instructing it to adjust the oil flow as required, in accordance to current driving conditions.

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