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Method for microorganism-pelleting heap leaching of earthy oxide copper ores

A heap leaching method and oxidized ore technology, applied in the direction of improving process efficiency, etc., can solve the problems of long process and high cost, achieve low investment, reduce labor costs and electricity costs, and achieve good environmental benefits

Inactive Publication Date: 2011-08-03
王宣明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing technologies of this type have the disadvantages of long process and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Microbial granulation heap leaching was carried out in a mine dominated by low-grade soil-like oxidized ore, and the ore composition is shown in Table 1. The process system is that the site is flat, the slope is 3%, and after removing sharp stones and debris, a protective sand layer with a thickness of 20cm is laid, and 1.5mm soft plastic is covered to prevent seepage, and then the ore sand washed by local water is laid with a thickness of 20cm, arranged at a distance of 3 meters The porous air pipe is connected to the air compressor in parallel. The thickness of the ore layer is 2 meters. The raw ore is classified by the drum sieve, and the fine ore with 80%f ), Thiobacillus thiooxidans (T t ) and Leptohelicobacter ferrooxidans (L f ) with a mass ratio of mixed bacteria of 5:3:2, and then adding 2% cement binder in total weight, under the condition of total moisture content of 28% to 30%, the ball making machine makes small balls with a diameter of 15mm and...

Embodiment 2

[0023] Example 2: After a factory washes and classifies the above-mentioned earthy oxidized ore, the fine ore part (grain size 160 mesh-1 mm) is leached with sulfuric acid with a content of 40-45 g / L. The average grade of the raw ore is 0.7%, and the copper grade of the filter-pressed dregs after leaching is 0.54%. The oxidation rate of the local soil-like oxide ore is actually not high after inspection. 40% of the fine ore is ≤160 mesh, the oxidation rate is 51%, and the vulcanization rate is 51%. 49%, and another 45% of the fine ore is less than 1.5mm, the oxidation rate is 53%, and the vulcanization rate is 47%, so the quality of filter ballast remains high.

[0024] The above-mentioned filter ballast containing 0.54% copper is used for microbial granulation heap leaching, the pellet diameter is 20mm, and the slope of the storage yard is 6%. When making balls, the acid content of bacterial acid water is 30g / L, and the bacteria content is 10 7 individual / ml, the mixed strai...

Embodiment 3

[0025] Example 3: Copper mines in a certain place are mined in massive pits. The ore with a grade of 0.32-0.73% accounts for 1 / 4 of the total reserves, and the soil-like oxide ore that can be mined in the open pit with a thickness of 10-15m and a width of 200-500m accounts for the total reserves. 3 / 4 of. Through elemental analysis and phase analysis, see Table 2. There is no need to build a stirring leaching plant when building a plant, but the bacterial heap leaching method is used for leaching. The concentration of sulfuric acid in the bacterial acid water used for making balls is 100g / L, and the bacterial content is 10 5 ~10 7 pcs / ml, (T f ), (T t ) and (L f ) in a ratio of 5.5:2.5:2, the amount of cement used in mixing and preparing is 1.5% (wt), and pellets with particle diameters ranging from 10 to 20mm are made into pellets, which are then column dipped after mixing at a dripping rate of 14L / m 2 h, dripping for 100 days,

[0026] The leaching rate reaches 81.14%....

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Abstract

The invention relates to a method for leaching earthy oxide copper ores, in particular to a method for microorganism-pelleting heap leaching, and belongs to the technical field of hydrometallurgy. The method is characterized in that: the earthy ores are directly screened, and fine ores with the granularity of 1.5mm are added with strain acid water and cement to prepare ore pellets with the diameter between 10 and 20 mm for heap leaching, wherein the mass concentration of sulphuric acid in the strain acid water is 3 to 10 percent, strains are mixed strains of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans, the mass ratio of the three is 4.0-5.5:2.5-3.5:1.5-2.5, the bacterial load ratio is 105 and 108 / ml, the cement amount is 15 to 30kg / ton of ores; and leachate in the leaching is sprayed for closed cycle production. The method has the advantages of low investment, low energy consumption, good leaching effect, and no discharge of closed cycle, solvesthe problem of leaching the low-grade earthy oxide copper ores (including sulphide and oxide blend ores) by microorganism heap leaching, and overcomes the defects of long flow and high cost of agitation leaching.

Description

technical field [0001] The invention relates to a method for leaching copper-earth oxide ore, in particular to a method for heap leaching by making microbial pellets, and belongs to the technical field of hydrometallurgy. Background technique [0002] Among the copper minerals, there is an ore body with a high degree of weathering and a finer particle size similar to soil on the surface layer - earthy copper oxide ore. Generally, the part with a particle size of less than 1mm accounts for more than 80% of the total, and the copper content is 0.1%. ~1.2%, the average grade is about 0.6%, containing inert copper and bound copper, belonging to a class of ores with low grade, difficult to handle and high processing cost. Due to its fine particle size and poor permeability, it is different from massive oxidized ore, so it is not suitable for direct heap leaching. Therefore, the current technology used to process this type of ore is the process of stirring and leaching, and there...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B15/00
CPCY02P10/20
Inventor 王鼎王宣明
Owner 王宣明
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