Padomi nātrija cianīda samazināšanai zelta apstrādes rūpnīcās

At preseNt, most Zelta apstrāde plants use Nātrija cianīds jo Zelta ieguve chemical. The zelta cianidēšana method is welcomed by MAny zelta raktuves owners all over the world because of its simple process and high atgūšanas ātrums.

1. Strengthen the Inflation and Improve the Oxygen SUPply Quality

Increasing aeration and increasing oxygen supply can reduce unnecessary patēriņš of liquid cianīdu. At present, most Zelta cianidēšanas rūpnīcas use low pressure (0.2mpa) oil-free air compressor for air supply, and the air supply volume is between 0.5-1.0m3/min tank. In order to improve the quality of the air supply, you set a small hole hood at the end of the air supply pipe to generate a large number of small diameter bubbles, or install a check valve to prevent backwardation.

2. Strictly Control the varš Grade of Raw Ore

varš consumes a large proportion of cianīdu iekš izskalošanās process. Piemēram, a Zelta cianidēšana plant has a copper grade of 0.548% in raw ore, and the mother liquor of the first Izskalošanās satur 1161mg/L copper, which consumes 37.6% of the annual Cianīda patēriņš. Due to the high copper content of the dissolving solution, in order to maintain the Zelta izskalošanās activity of the solution, the Nātrija cianīds koncentrācija vircā ir attiecīgi jāpalielina, kas vēl vairāk palielina patēriņu nātrija cianīds. Therefore, controlling the copper content of the raw ore can not only reduce the Nātrija cianīds consumed by dissolving copper, but also greatly reduce the Nātrija cianīda koncentrācija iekš izskalošanās šķīdums.

In order to reduce the grade of copper, you can pretreat it by flotācija or other methods, and then leACHING zelts after copper is separated.

3. Kontrolējiet CN un O2 koncentrācijas attiecību suspensijā

Laikā zelta izskalošanās process, air and Nātrija cianīds must be added to ensure the leaching of gold. The diffusion rate of gold in the solution depends not only on the concentration of CN– and O2 in the solution, but also on the concentration of CN– per unit gold surface, the concentration of dissolved O2. the surface area of gold particles and the thickness of the electric double layer.

CN–/O2=4x(Dissolved oxygen diffusion coefficient/Nātrija cianīds diffusion coefficient)

=4×(2.76×10-5cm/s ÷1.83×10-5cm/s)=4×1.5=6

Šo attiecību sauc par izšķīdušā zelta robežkoncentrācijas vērtību.

For different types of ore, its value can be adjusted in the range of 4.6 to 7.4 to determine the best benefit ratio. If excessive nātrija cianīds or air is added during the Izskalošanās process, it will not increase the Izskalošanās ātrums of gold and cause waste. Therefore, in the Zelta izskalošanas process, it is often necessary to analyze and control the Brīvs cianīds and the oxygen content in the solution to keep the ratio of the two at about 6.

4. Establish the deva Atlikums Cianīds

nātrijs cyanide is the main consumption agent of zelta cianizācijas process. Therefore, the balance of nātrija cianīda deva should be frequently studied. The so-called cyanide balance refers to the balance between the cyanide discharged from the leaching solution and the actual consumption of nātrijs cyanide, which is related to the process technical indicators, economic costs, videal treatment and other costs.

In addition to the formation of various complexes and compounds, the loss of nātrijs cyanide also includes the Adsorbcija of clay sludge, the adsorbcija of mineral particles and the escape of a very small amount of Ciānūdeņradis. The former consumption should account for about 90%. If it is lower than this value, it should be attributed to the quality of Nātrijs cyanide, raw ore components, and ūdens balance, or the measurement in operation, or “dropping, leaking, bubbling and leaking”.

5. Control Reasonable Kalcija oksīds (CaO) Concentration

In the process of oxidative zelta ieguve, Laims must be added.And it is very important to maintain a proper Kalcija oksīds concentration. Its main functions are:

CaO can increase the pH vērtība of the leach solution, reduces the concentration of HCN produced and reduces the volatilization of HCN gas.

Due to the addition of Ca2+ in the solution, the izskalošanās ātrums of copper significantly decreased, prevenalvag the formation of Fe (CNS) 4. and the concentration of CNS-ions in the solution decreased. Ca2+ prevents the combination of CN- with Cu and S, thus effectively reducing the consumption of cyanide.

After repeated trials, experts believe that it is reasonable to add Kalcijs oxide 12 g/kg.

noslēgumā

The above are 5 ways to reduce the amount of sodium cyanide in Zelta cianidēšana plants. In actual ražošana, the amount of various elements can be appropriately adjusted according to the actual situation to reduce the consumption of sodium cyanide, save costs, and reduce the harm of Cianīda notekūdeņi to the envdzelzsdomāju.

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