Gold ring the company as early as 1993 began to focus on the most renewable technologies and equipment markets. After years of information collection, performance comparison, and the success of small-scale experiments, the selection of South African Mintek technology [ 7 ], combined with China's national conditions for the development of recycling equipment. After more than one year of trial improvement, the JHR-150 equipment was developed and industrially tested in July 1998 . Jinhuan Company applied for 2 utility model patents [ 8 ] and [ 9 ] and has obtained patent rights.

8 characteristics of the new regenerative furnace

The development of the new activated carbon regenerative furnace is mainly based on the fact that the domestic gold mines are small in scale and the required regeneration equipment is small. The 150 , 400 , 700kg/d scale equipment currently developed is a complete product of the 100 , 300 , 1000t/d all-mud cyanide carbon pulp plant. The new device consists of four parts. That is, regenerative furnace body, electric control cabinet, DC power supply, and water supply and exhaust equipment.

The new equipment is characterized by low power consumption (less than 0.8kwh/t ), easy operation, no pollution in the operation area (very small noise, no exhaust gas escape), small footprint (small footprint) 5M ³ Factory height 5m . It is recommended to install awning installation equipment outdoors, low accident rate, easy replacement of wearing parts, and low cost of wearing parts. The only downside is: long start arsenic ore containing carbon regeneration time.

9 Reference data for activated carbon regeneration test at home and abroad (due to the different degree of contamination of activated carbon used, different regenerators used, different analytical methods, poor comparability, for reference only)

a new carbon, polluted carbon, pickled charcoal, high temperature regenerated carbon activity comparison

Experimental results of adsorption capacity of activated carbon in various states [ 4 ]

   State of activated carbon    Adsorption gold capacity ( mg/g )

   Xinxing Nuclear Charcoal 11.41

   Acid-treated apricot kernel charcoal 7.83

   Apricot nuclear charcoal after heat regeneration 16.68

Removal of impurities on activated carbon [ 4 ]

Activated carbon CaO content ( % ) MgO content ( % )

New apricot nuclear charcoal 0.98 0.47

After desorption of charcoal 4.01 0.40

After acid treatment, charcoal 0.23 0.05

Thermally regenerated charcoal after acid treatment 0.20 0.07

Removal of impurities on activated carbon [ 10 ]

Activated carbon CaO content ( % ) MgO content ( % ) SiO ₂ content ( % )

new     Charcoal 0.58 0.086 0 . 04

After desorption of charcoal 2.65 0.086 0 . 09

After acid treatment, charcoal 0.007 0.004 0 . 05

Comparison of thorough pickling and less acid pickling regeneration [ 5 ]

Processing method      Poor charcoal   Poor carbon is not completely regenerated after pickling   Poor charcoal and low pickling regeneration

Iodine value / mg. G-1 778. 41 842. 25 883. 76

Recovery rate /% 95 . 86 100 . 59

Strength /% 92 . 8 92 . 6

b regeneration temperature and regeneration effect relationship ( 5% nitric acid leaching) [ 5 ]

Regeneration temperature / °C 500 600 650 700 750 780 840

Iodine value / mg.g-1 853.53 867.70 893.88 901.12 893.10 860.94 818.73

Reference iodine value data: new charcoal 878 . 57 ; lean charcoal 773 . 56 ; poor charcoal pickling 767 . 15

c Henan Linghu gold mine lean carbon regeneration effect [ 5 ]

Activated carbon form    Poor charcoal     Poor charcoal wash   Poor charcoal pickling regeneration   Poor carbon regeneration

Iodine value / mg . g-1 843 924 . 25 1095 . 2 1036 . 4

Recovery rate /% 77 . 02 84 . 39 100 94 . 63

Processing method        Cold pickling after charcoal regeneration   Hot pickling after charcoal regeneration

Iodine value / mg . g-1 1037 . 43 1022 . 95

Recovery rate /% 94 . 73 93 . 40

d Henan Linghu gold mine activated carbon regeneration effect [ 10 ]

Charcoal form      Cyanide precious gold concentration / mg.g-1 gold adsorption rate /% adsorption capacity / mg.g-1

New apricot nuclear charcoal 5.74 55.57 4.75

Desorption charcoal 3.58 36.87 2.65

Acid Recycled Carbon 3.2 42.1 3.66

Thermally recycled charcoal 4.30 64.2 4.69

references

1 Preparation, properties and application of Chenqiti gold activated carbon "Gold" 1990 , ( 1 ): 29 ~ 33

Determination of the performance of activated carbon for 2 sheets of gold and the selection of "Gold" 1991 , ( 12 ): 39 ~ 42

3 Sun Xingjia's research, production and application of activated carbon for gold extraction "Gold" 1994 , ( 12 ): 51 ~ 55

4 Liu Chromium and other carbon slurry method for gold-carbon recycling industrial production test research "Gold" 1986 , ( 3 ): 49 ~ 50

5 Wu Zhenxiang and other live charcoal forced discharge regeneration technology in the carbon slurry process gold extraction process "China's gold production practical technology" Metallurgical Industry Press Conference 1998 , 380 ~ 382

6 卞Xinxu activated carbon high temperature thermal regeneration equipment review "Gold" 1998 , ( 3 ): 43 ~ 45

7 hhpt//

8 Chinese utility model patent ZL98

9 Chinese utility model patent ZL99

10 Liu Ming's discussion on the carbon regeneration of the charcoal gold extraction plant "Gold" 1994 , ( 12 ): 25 ~ 28

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