In the previous paper, the result of analysis was reported on the flow of gas through coal measure rocks into an open space made in the rock. The present paper treats the similar flow of gas through coal seams which are capable to adsorb much methane gas. It is assumed, in this analysis, that the total amount of gas which is readily released when the gas pressure is lowered is approximately proportional to the α-th power of the pressure, α being about 0.6.
The partial differential equations obtained showing the variation in pressure with the time and distance are solved numerically by using a digital computer. Thus the rate of flow of gas through coal seams-caused by making a plane or cylindrical free face is cleared out. By comparing this rate of flow of gas through coal seams with that through coal measure rocks, it is found that the rate of pressure drop is much smaller and the amount of gas issued in a definite period of time is much greater than those in the latter case.

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以上, 銅活性人工ZnSを用いて亜硫酸塩の抑制作用についての実験結果をまとめると.
(1) 銅活性化人工ZnSに対する亜硫酸塩の抑制効果はパルプ中に金属イオンが存在しない場合にはほとんど認められず, その場合, 脱銅, 脱ザンセートも認められない.
(2) 銅活性人工ZnSに対する亜硫酸塩の抑制効果は硫酸亜鉛を添加するとき, 中性pH付近で顕著に認められ, その場合, Zn²⁺/SO₃^2-の比がほぼ1に近いようなときにもっとも抑制効果が著しい.
(3) 銅活性人工ZnSに対して硫酸亜鉛と亜硫酸ナトリウムを添加する場合, 中性付近においそ若干の脱銅が認められるが, 吸着銅量に比して少なく, 抑制の原因とは考え難い.
(4) 亜鉛イオンと亜硫酸イオンは反応して亜硫酸亜鉛が沈殿生成されるが, 亜硫酸亜鉛の生成は中性pH付近においてもっとも行なわれやすく, 抑制効果の認められるpHとよく対応している.
以上の実験結果より, 銅活性人工ZnSに対する亜硫酸亜鉛の抑制作用は, 脱銅ということではなく, 親水性の亜硫酸亜鉛がZnS表面に沈着することに起因すると考えられる.

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Chloride volatilization of impurities in pyrite cinder by using heavy oil was performed in a pilot rotary kiln. Based on the results of laboratory scale experiments, 300kg /h capacity rotary kiln was prepared, whose inner diameter was 600mm and the length was 6, 100mm. This kiln was equipped with a high-pressure burner of heavy oil and the firing temperature was controlled.
Under the optimum conditions, the content of nonferrous metals in the calcined pellet was: 0.03%> Cu, 0.02%>Zn, 0.03%>S and 60%<Fe. Physical properties of the pellet was: 300kg/pellet<crushing strength, 17-22% porosity and about 80% reducibility.

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The paper describes an improved process for the recovery, purification and concentration of metal values from process streams. The process employes carboxylic acids capable of extracting metal values from their hydroxides which is suspended in aquous solutions. Tertiary carboxylic acids, Versatic 9 and 911, are shown to act as a useful extractant for Cu, Zn, Ni and the other metals. When a slurry of a metal hydroxide is brought into contact with a solution of the carboxylic acid in kerosene the hydroxide readily dissolves and the metal carboxylate is formed in the organic phase. Carboxylic acid concentration affects the dissolution of the hydroxide. In the case of 0.22 M Versatic 911, a limited amount of copper hydroxide which is precipitated from 0.05M copper sulphate solution, can be dissolved. In applying them in mineral processing, a metal is expected to be extracted by, single stage solvent extraction after the complete neutralization of feed solution with alkali and the decantation. The raffinate which contains a small amount of the metal is recycled to the first neutralization step. Since distribution ratio increases in proportion to the phase ratio A/O, the process is an ideal way of concentrating a solution without evaporating water.

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