Abstract: A copper smelting process is disclosed in which copper concentrate is smelted in a furnace to produce purified copper. Flue gas discharged from the furnace is treated to produce sulfuric acid. Furthermore, waste liquid discharged during the production of sulfuric acid is treated to produce gypsum, and the gypsum thus produced is recycled to the furnace as a flux. The flue gas may be exhausted from either or both of a smelting furnace and a converting furnace, and the gypsum may be preferably introduced into the converting furnace.

Abstract: An improved process for recovering tellurium from copper electrolysis slime. The process comprises leaching copper and tellurium from said slime with sulfuric acid and recovering tellurium from the solution after leaching (called "leach") by suspending at least one copper electrode plate in a bath of a leach, allowing tellurium to deposit on the surface thereof as copper telluride, agitating the bath as required so as to remove the copper telluride formed on the surface of the copper plates and allow it to settle, collecting the copper telluride precipitate and obtaining tellurium by means known per se. A high grade copper tellurium precipitate is obtained.

Abstract: An improved integrated circuit in which capacitive loads can be driven at a high speed is disclosed. The circuit comprises a first and a second capacitive loads disposed separately from each other, a first switch located near the first capacitive load and adapted to drive it with a power source, a second switch located near the second capacitive load and adapted to drive it with the power source, and means for simultaneously controlling the first and second switch.

Abstract: A semiconductor memory device having a large memory capacity and an improved read-out function is disclosed. The device comprises a plurality of word lines extended in the row direction, a plurality of pairs of data lines extended in the column direction and arranged in parallel, a plurality of memory cells arranged at the cross-points between the word lines and the data lines, and a plurality of sense amplifiers each coupled to each pair of the data lines, and is featured in that n (an integer of two or more) sense amplifiers are arrayed respectively in the column direction and are arranged for every n pairs of data lines in the row direction.