Bulletin - كتب Google

تسجيل الدخول

كتب

صور الصفحة

النشر الإلكتروني

Roasting zinc sulphide ores..

Chloridizing roasting.

Oxide roasting......

Sulphate roasting.

Roasting of a low-iron ore from Daly-Judge mine..

Description of ore and of method used....

Discussion of results of tests.

Leaching the calcine........

Roasting of a high-iron ore from Honorine mine.

Effects of temperature and time of roasting.

Effects of fineness of grinding......

Experiments to determine the effects of lead..

Leaching the calcined ore.....

General method used in tests...

Tests of ore from Daly-Judge mine.....

Tests of ore from Bullion Coalition mine...

Effects of roasting with sodium chloride..

Treatment of low-lead mill products..

Tests of marmatite ore from Wasa mine.

Tests of partly oxidized ores....

Ore from Lower Mammoth mine.

Marmatite ore from Wasa mine...

Magnetic roasting...

Hydrometallurgy of zinc sulphide ores.

Sulphate processes.......

Sulphite processes.

Difficulties of applying process..

[blocks in formation]

Precipitation of zinc sulphate solutions with calcium chloride.

Precipitation of zinc chloride with lime.

Tests with pure zinc chloride...................

Experiment with oxidized zinc ore.

Removal of manganese.....

Use of chloride of lime in moderate amounts....

Use of larger amounts of chloride of lime..

Use of zinc chloride solution...

Tests with chlorine water..

Tests with chlorine gas...

Bisulphite solutions...

[blocks in formation]

Publications available for free distribution....

Publications that may be obtained only through the Superintendent of

TABLES.

TABLE 1. Production of spelter in the United States in 1914...

2. Recovery of zinc by various concentration processes.

3. Analyses of oxidized and semioxidized zinc ores..

4. Analyses of complex zinc-sulphide ores and concentrates.

5. Names of shippers from Park City district during 1915, with ton-

nage and products shipped.....

6. Mill tests at the Daly-Judge mill...

7. Results of magnetic separation of Utah-Apex zinc-iron middling..

8. Results of magnetic separation of ore from Consolidated Nevada-

9. Results of magnetic separation of ore from Greenwood lease..........

10. Results of magnetic concentration of zinc middling from the Broad-

11. Results of magnetic separation of ore from Carlyle mine, roasting

without tabling.

12. Results of magnetic separation of ore from Carlyle mine, with

50

TABLE 13. Results of magnetic separation of ore from C. O. D. mine near

Chloride, Ariz...........

14. Results of concentration tests of ore from Middle Golconda mine...

15. Results of analyses of zinc-lead sulphide ores.

16. Results of leaching Daly-Judge calcines........

17. Results of leaching calcines from the roasting of Bullion Coalition

18. Results of leaching calcines from chloridizing roast of Bullion

Coalition No. 5 ore....

19. Results of analyses of four zinc products low in lead.........

20. Results of screen analyses of zinc ores and concentrates low in lead.. 69

21. Leaching zinc blende from Joplin, Mo., after roasting................

22. Results of leading zinc-blende concentrate and zinc-iron middling

from Midvale, Utah, after roasting.

69

23. Results of leaching ore from Wasa mine after roasting at 750° C. for

24. Results of screen analysis of partly oxidized ores from Lower Mam-

moth mine after roasting....

25. Results of roasting and leaching partly oxidized zinc ore, Lower

Mammoth No. 1..

26. Roasting and leaching partly oxidized zinc ore, Lower Mammoth

27. Results of roasting and sulphuric acid leaching, ore from Wasa mine..

28. Precipitation of sulphates from zinc sulphate solutions with calcium

29. Precipitation of zinc chloride solutions with lime.......

30. Results of treating zinc-sulphate leaching solutions with lime com-

31. Results of treating zinc sulphate solutions with lime compounds for

removal of manganese.......

32. Results of treating zinc sulphate solutions with excess CaOCl2 to

remove manganese.......

33. Results of treating zinc hydroxide precipitate with zinc chloride

solution to remove lime.

34. Results of treating zinc sulphate solutions with chlorine to oxidize

35. Results of cyclic leaching and precipitation tests..

36. Results of calcining oxidized zinc ores..

37. Results of igneous concentration of oxidized zinc ore in a small

blast furnace..........

38. Results of igneous concentration of low-grade sulphide ores of lead

and zinc in a small blast furnace....

39. Costs and profits of a 25-ton zinc oxide plant.....

40. Costs and profits of a 50-ton zinc oxide plant...

41. Compositions of oxidized zinc ores used in leaching tests with

sulphuric acid...................

42. Results of trial leaches on 1-gram samples of oxidized ores...

43. Results of leaching oxidized zinc ores with sulphuric acid, showing

zinc recovery and acid efficiency...

44. Results of analyses of neutral solution of zinc sulphate and

45. Results of sulphurous acid leaching of oxidized zinc ores..

46. Results of leaching oxidized zinc ore with caustic soda solution....

ILLUSTRATIONS.

Page.

FIGURE 1. Present source of zinc and also ores not utilized.....

2. Curves showing effect of temperature on speed of roasting, Daly-

Judge No. 1 sample....

3. Curves showing effects of leaching with different solvents, Daly-

Judge No. 1 sample.....................

4. Curves showing effect of temperature on speed of roasting, Bullion

Coalition No. 5 sample.......

5. Curves showing effects of size of ore on speed of roasting, Bullion

Coalition No. 5 sample.......

6. Curves showing effects of temperature on solubility of zinc and

lead in slime from Horn Silver dump, Frisco, Utah...

7. Curves showing effects of roasting on solubility of zinc and lead

in various ores.

8. Curves showing effects of roasting on solubility of zinc and iron in

semioxidized zinc ore from Lower Mammoth mine.......

9. Curves showing effect of strength of sulphurous acid on velocity of

solution of zinc oxide...............

10. Labratory blast furnace used for zinc-oxide experiments.....

11. Curves showing net smelter prices for oxidized zinc ores at Salt

Lake City.......

12 Curves showing change in value of zinc oxide concentrate with vary-

ing zinc content....

13. Plan and sections of 25-ton zinc-oxide plant...............

14. Curves showing cost per ton of ore for a 25-ton igneous concentra-

tion plant and returns as calculated from "ore" contract.........

15. Curves showing cost per ton of ore for a 25-ton igneous concentra-

tion plant and returns as calculated from "zinc oxide" contract.

16. Curves showing cost per ton of ore for a 50-ton igneous concentra-

tion plant and returns based on "ore" contract..

17. Curves showing cost per ton of ore for a 50-ton igneous concentra-

tion plant and returns as calculated from “zinc oxide" contract. 119

18. Curves showing efficiency of weak acids in four successive leaches. 122

19. Curves showing recovery of zinc in four successive leaches with

weak acids.....

20. Curves showing relation of zinc recovery to molecular weights of

acids used................

21. Curves showing effect of different concentrations of sulphuric acid.

22. Curves showing effects of different concentrations of hydrochloric

23. Curves for computing acid efficiency when weights of acids con-

sumed and zinc recovered are known...

« السابقة متابعة »