First, the material
The material used in the test is ore. The ore includes two kinds of ore and block ore. The two ores are taken from different ore points of the same deposit. The former is the result of strong weathering of ore. The fine ore is high in mud, and it is not suitable for direct heap leaching. After the crushed ore is crushed, the shale content is also high, and in the leaching process, with the acidification and leaching of the ore, the carbonate component inside the ore is The acid reaction releases CO 2 gas, and the ore is muddy, which reduces the permeability of the entire heap, so it is also not suitable for direct heap leaching. The grade of fine ore is 2.00% and the moisture content is 5.96%. The average grade of lump ore is 1.86%, and the ore moisture content is 2.18%. The results of sieve analysis are shown in Table 1.
Second, the method
The test method includes: a stirring leaching test method and a column leaching test method, the specific method is as follows: stirring leaching test method: the block ore is crushed and ground to -100 mesh, and 5% (v/v) H 2 SO 4 is used as a leaching agent. . The liquid-solid ratio was 2:1, and the mixture was thoroughly stirred at room temperature for 24 h to analyze the composition of the leachate. The powdered ore is also ground to -100 mesh, only changing the concentration of the leaching agent, and the rest of the conditions are the same as the ore. Column immersion test method: Refer to the relevant data, through the test, select a granulation binder, the ore is broken to a 10mm, a certain amount of binder and water are added for granulation, and after 24 hours of curing, the column is leached. The leaching column leaching test was carried out with powder ore, lump ore and mixed minerals of the two, respectively, and the composition of the leaching solution was analyzed.
Third, the test results and discussion
(1) Stirring leaching test results
The test was carried out in accordance with the above stirring test method, and the test results obtained are shown in Table 2 and Table 3.
It can be seen from the results in Table 2 that the leaching rate of the agglomerate leaching leaching is over 90%. The acid consumption is 4.8%-6.1%. The leaching conditions of different particle size after crushing are not much different, and the results of sieve analysis also show that the distribution of different grain sizes is relatively uniform, and the grades are not much different. Therefore, the following tests do not consider the influence of grain size. Broken to -10mm.
From the results in Table 3, it is known that the leaching agent concentration is 3% (V/V) H 2 SO 4 to obtain an ideal leaching effect.
The results in Table 2 and Table 3 show that the acid consumption of the massive ore and powder ore is close, but the leaching rate of the powder ore is slightly higher.
(2) Results of granulation column leaching test
The test was carried out in accordance with the above column immersion test method, and the results obtained are shown in Table 4 and Figs. 1 and 2.
The results of Figure 1, Figure 2 and Table 4 show that the leaching rates of the three ores are more than 90%, the acid consumption is about 6%, which is basically consistent with the stirring leaching; the liquid-solid is relatively small, about 3:1, and the peak concentration is higher. After the ore is leached, the particles remain intact, the permeability of the pillar is good, and the ore height is basically stable; indicating that it is technically feasible to use the granulation heap leaching process to treat such ore.
Fourth, the conclusion
Our muddy low-grade copper oxide ore reserves quite large, difficult to handle at present, the main problem is the poor ore permeability. In this study, the stability of the particles under acidic conditions was successfully solved by selecting suitable binders and granulation conditions, and the permeability of the heap during the heap leaching process was improved. In addition to the good leaching performance of the ore itself, it is technically feasible to carry out acid granulation heap leaching of such ore. As to whether it is economically reasonable, it should be confirmed by a large-scale test.
The equipment is new complete equipment used in gold trade to recover gold from the gold-carrying carbon. It is suitable for desorption and electrolysis of gold-carrying carbon with different grades. The desorption is an intermixture of 1~2% sodium cyanide and 1~4% sodium hydroxide. The desorption solution is pumped to the heater by circulating pump and heated to the desired temperature. Then the solution flows downward to the bottom of desorption column, through the gold-carrying carbon in the column and upward to the top of it. During flowing, the solution strip gold from the carbon (at this stage the solution containing gold is called as pregnant solution). The pregnant solution runs out from the top of the column and into the electrolytic cell. In cell, the gold in the solution is electrically deposited in the steel wool of the cathode frame, and the rest (called as lean solution) flows back to desorption solution cell and recycled.
The gold mud containing rich gold and silver is taken out of desorption cell and transported to the separation section.
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