A method for determining the carbon extraction time in a carbon pulp plant

Abstract

The present invention belongs to the technical field of full-mud cyanidation carbon slurry method, and in particular relates to a method for determining the carbon extraction time of a carbon slurry plant; calculating the leaching rate of gold at different leaching times, finding out the leaching time required for the leaching rate to reach the requirement, preparing slurry samples for leaching according to the leaching time, and chemically analyzing the gold grade of the liquid; placing activated carbon in different slurry samples for adsorption for multiple times, and chemically analyzing the gold grade of the liquid; stopping the adsorption until it remains unchanged, recording the total adsorption time of the activated carbon, and chemically analyzing the gold grade of the activated carbon; calculating the gold grade of the activated carbon at different adsorption times, drawing a curve of the change of the gold grade of the activated carbon with the adsorption time, and finding out the adsorption time required to reach the preset gold grade of the production of gold-loaded carbon; the method can ensure the gold grade of the first tank activated carbon under the premise of ensuring the adsorption effect of gold, facilitates the carbon slurry process production enterprise to scientifically manage production parameters and formulate metal extraction plans, and is also helpful for formulating and optimizing the carbon extraction time.

Description

Technical Field

[0001] The invention belongs to the technical field of full-slime cyanidation carbon pulping method, and in particular relates to a method for determining the carbon extraction time of a carbon pulp plant. Background Art

[0002] The full-slime cyanide carbon-in-slurry method is a mineral processing process that uses activated carbon to absorb gold-cyanide complexes after cyanide leaching of gold-containing ore to achieve gold recovery. At present, my country's carbon-in-slurry plants have problems such as high bottom carbon density, low gold-carrying carbon grade, and unreasonable carbon extraction time in the activated carbon adsorption process, which seriously affects the production technology indicators and economic benefits of enterprises.

[0003] The main principle for formulating carbon adsorption process parameters in carbon slurry process production is to take into account both the gold-loaded carbon grade and the gold adsorption rate, that is, to maximize the adsorption rate while ensuring a high gold-loaded carbon grade. However, in actual production, the gold-loaded carbon grade and the adsorption rate are contradictory. The main way to solve this problem is to formulate a reasonable carbon extraction and stringing system. However, there is currently no relevant research method on how to determine the carbon extraction time of a carbon slurry plant, and only the empirical values ​​of relevant companies can be applied. However, there are differences in ore properties, activated carbon quality and process structure between different companies, resulting in unreasonable initial carbon extraction parameters. In this way, it is even more impossible to formulate a reasonable stringing system, and the carbon adsorption production process is difficult to stabilize, which in turn leads to the deterioration of subsequent carbon adsorption indicators. Summary of the invention

[0004] In order to solve the problem that the carbon extraction time in a carbon pulp plant cannot be accurately determined, the present invention provides a method for determining the carbon extraction time in a carbon pulp plant. The method can accurately determine the extraction time of gold-loaded carbon in the first tank in the carbon pulp process, which can not only ensure the adsorption rate of gold in carbon pulp production, but also is conducive to scientific gold extraction and production management.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A method for determining the carbon extraction time of a carbon pulp plant comprises the following steps:

[0007] Step 1: Prepare ore pulp with grinding fineness and ore mass concentration that meet the production process requirements, add lime and sodium cyanide to the ore pulp for cyanide leaching; at the same time, control the cyanide leaching time of the ore pulp, and calculate the gold leaching rate under different leaching time conditions by testing the gold grade of the leached residue under different leaching time conditions, and draw a leaching time and leaching rate curve;

[0008] Step 2: Find the leaching time required for the leaching rate to reach the preset requirement in the curve obtained in step 1, prepare n slurry samples with a volume of V, and make each slurry sample leached according to the leaching time, so the liquid gold grade in each slurry sample is recorded as β0;

[0009] Step 3: Take the pretreated activated carbon and place it in one of the slurry samples with a liquid gold grade of β0 and a volume of V in step 2 for stirring and adsorption, and analyze the liquid gold grade of β1 in the slurry sample after activated carbon adsorption; then place the activated carbon in the second slurry sample for stirring and adsorption, and analyze the liquid gold grade of β2 in the second slurry sample after activated carbon adsorption. The adsorption time for each time is 6h~8h, and this is repeated until β i Stop the adsorption when it remains unchanged for at least two times in a row, where i = 1, 2, 3...n, record the total adsorption time T of the activated carbon in different slurry samples at this time, and test the gold grade βc of the activated carbon;

[0010] Step 4: According to the gold grade test results of the liquid in step 3, calculate the gold grade θ of the activated carbon under different adsorption time conditions t , the calculation formula is Where t is the adsorption time, M is the mass of activated carbon;

[0011] Step 5: Based on the θ calculated in step 4 t , draw a curve of activated carbon gold grade changing with adsorption time, and find the adsorption time Tx required to reach the preset gold grade of gold-loaded carbon in the curve. This time is the carbon extraction time.

[0012] In step 1, the ore pulp that meets the production process requirements has a grinding fineness of -0.074mm and a content of 80% to 95%, a mass concentration of the ore pulp of 40% to 50%, and a leaching time interval of 2h to 12h for the gold grade of the slag under different leaching times.

[0013] In step 2, the leaching rate is usually preset to be 40% to 65% by mass.

[0014] In the step 3, the activated carbon is activated carbon that has been pre-treated by grinding, and the particle size is 6 mesh to 18 mesh.

[0015] In step 3, the ratio between the mass of activated carbon and the volume V of the slurry sample is 10 g / L to 20 g / L.

[0016] The gold grade of activated carbon under different adsorption time conditions calculated in step 4 refers to the cumulative gold grade.

[0017] In step 5, the preset gold grade for producing gold-loaded carbon is 2000 g / t to 4000 g / t.

[0018] The beneficial effects of the present invention are:

[0019] ① According to the changing law of leaching rate in the leaching slurry produced by the carbon pulp plant, the changes in the solid phase gold grade of activated carbon and the liquid phase gold grade of the slurry when the activated carbon is put into the leaching adsorption tank can be dynamically grasped. ② It can accurately calculate the carbon grade corresponding to different adsorption times under the condition that the liquid phase gold grade of the slurry is β0. This method can ensure the gold grade of the first tank activated carbon under the premise of ensuring the adsorption effect of gold, which is convenient for carbon pulp process production enterprises to scientifically manage production parameters and formulate metal extraction plans, and at the same time it is helpful to formulate and optimize the carbon extraction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without creative work.

[0021] Figure 1 It is a flow chart of the present invention.

[0022] Figure 2 This is a graph showing the gold leaching rate and leaching time.

[0023] Figure 3 This is the adsorption time and activated carbon grade curve. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0025] Example 1

[0026] like Figure 1 As shown, a method for determining the carbon extraction time of a carbon pulp plant comprises the following steps:

[0027] Step 1: Prepare ore pulp with grinding fineness and ore mass concentration that meet the production process requirements, add lime and sodium cyanide to the ore pulp for cyanide leaching; at the same time, control the cyanide leaching time of the ore pulp, and calculate the gold leaching rate under different leaching time conditions by testing the gold grade of the leached residue under different leaching time conditions, and draw a leaching time and leaching rate curve;

[0028] Step 2: Find the leaching time required for the leaching rate to reach the preset requirement in the curve obtained in step 1, use the same ore to prepare n slurry samples with a volume of V, and make each slurry sample leached according to the leaching time, so that the liquid gold grade in each slurry sample is the same, recorded as β0;

[0029] Step 3: Take the pretreated activated carbon and place it in one of the slurry samples with a liquid gold grade of β0 and a volume of V in step 2 for stirring and adsorption, and analyze the liquid gold grade of β1 in the slurry sample after activated carbon adsorption; then place the activated carbon in the second slurry sample for stirring and adsorption, and analyze the liquid gold grade of β2 in the second slurry sample after activated carbon adsorption. The adsorption time for each time is 6h~8h, and this is repeated until β i Stop the adsorption when it remains unchanged for at least two times in a row, where i = 1, 2, 3...n, record the total adsorption time T of the activated carbon in different slurry samples at this time, and test the gold grade βc of the activated carbon;

[0030] Step 4: According to the gold grade test results of the liquid in step 3, calculate the gold grade θ of the activated carbon under different adsorption time conditions t , the calculation formula is Where t is the adsorption time, i = 1, 2, 3...n, M is the mass of activated carbon;

[0031] Step 5: Based on the θ calculated in step 4 t , draw a curve of activated carbon gold grade changing with adsorption time, and find the adsorption time Tx required to reach the preset gold grade of gold-loaded carbon in the curve. This time is the carbon extraction time.

[0032] Preferably, in step 1 of the above method for determining the carbon extraction time, the slurry that meets the production process requirements has a grinding fineness of -0.074 mm and a content of 80% to 95%, a mass concentration of the slurry of 40% to 50%, and the leaching time interval of the leaching slag gold grade under different leaching times is 2h to 12h.

[0033] Preferably, in step 2 of the above method for determining the carbon extraction time, the preset requirement for the leaching rate is usually 40% to 65% by mass.

[0034] Preferably, in step 3 of the method for determining the carbon extraction time, the activated carbon is activated carbon that has been pre-treated by grinding, and the particle size is 6 mesh to 18 mesh. The activated carbon must be pre-treated by grinding during the addition process to prevent the generation of powdered carbon during the stirring process.

[0035] Preferably, in step 3 of the above method for determining the carbon extraction time, the ratio between the mass of activated carbon and the volume V of the slurry sample is 10 g / L to 20 g / L.

[0036] Preferably, the gold grade of activated carbon under different adsorption time conditions calculated in step 4 of the above method for determining the carbon extraction time refers to the cumulative gold grade.

[0037] Preferably, in step 5 of the above method for determining the carbon extraction time, the preset gold grade for producing gold-loaded carbon is usually 2000 g / t to 4000 g / t.

[0038] Example 2

[0039] Step 1: Prepare ore pulp with grinding fineness and ore mass concentration that meet the production process requirements, add lime and sodium cyanide to the ore pulp for cyanide leaching; at the same time, control the cyanide leaching time of the ore pulp, calculate the gold leaching rate under different leaching time conditions by testing the gold grade of the leached residue, and draw a leaching time and leaching rate curve;

[0040] Step 2: Find the leaching time required for the leaching rate to reach the preset requirement in the curve obtained in step 1, prepare the slurry sample under the leaching time condition, and analyze the gold grade β0 in the liquid;

[0041] Step 3: Place the pretreated activated carbon in a liquid slurry with a gold grade of β0 and a volume of V for stirring and adsorption. After 6 to 8 hours of adsorption, take out the activated carbon and analyze the liquid gold grade β i Then the activated carbon is placed back into the leaching slurry with a gold grade of β0 to continue stirring and adsorbing, and this process is repeated until β i Stop adsorption when ≈β0, record the adsorption time T and test the gold grade βc of activated carbon;

[0042] ① The gold cyanide complex ions in the liquid will be adsorbed into the activated carbon, so the concentration of gold ions in the liquid will become lower and lower after adding activated carbon.

[0043] ② As the adsorption process proceeds, the gold content in the activated carbon will gradually increase. When the saturated adsorption capacity of the activated carbon is reached, the activated carbon will no longer adsorb gold cyanide complex ions, and no adsorption will occur at this time. Therefore, β i can be approximately equal to β0.

[0044] Step 4: According to the gold grade test results of the liquid in step 3, calculate the gold grade θ of the activated carbon under different adsorption time conditions t , the calculation formula is Where M is the mass of activated carbon;

[0045] Step 5: Based on the θ calculated in step 4 t , draw a curve of activated carbon gold grade changing with adsorption time, and find the adsorption time Tx required to reach the preset gold grade of gold-loaded carbon in the curve. This time is the carbon extraction time.

[0046] Preferably, in step 1 of the above method for determining the carbon extraction time, the slurry that meets the production process requirements has a grinding fineness of -0.074 mm and a content of 80% to 95%, a slurry concentration of 40% to 50%, and the time interval for each cyanide leaching of the slurry is controlled to be 2h to 12h.

[0047] Example 3

[0048] This example takes a raw ore full mud cyanide gold mine as the research object. The gold content in the raw ore is 2.35g / t. The metal sulfides in the ore are mainly pyrite, followed by pyrrhotite and arsenopyrite, with a small amount of chalcopyrite, galena and sphalerite, etc., accounting for a total mass of 6.71%. The metal oxides are mainly magnetite, hematite and limonite, accounting for a total mass of 1.63%. The gangue minerals are mainly quartz, accounting for 74.88% of the mass, with a small amount of chlorite, feldspar, carbonate and mica. The content of other gangue minerals such as garnet and diopside is relatively small. The preset gold-bearing carbon grade of the carbon pulp plant is 3500g / t.

[0049] Step 1: Grind the gold ore and water of equal mass in a wet ball mill, control the grinding product particle size -0.074mm content to 90%, adjust the slurry solid concentration to 40% of the original ore slurry, add 2kg / t of lime to the slurry, adjust the slurry pH to 10-11, add 0.8kg / t of sodium cyanide, take samples for testing at intervals of 2h to 12h, and draw a leaching time and leaching rate curve, as shown in the figure. Figure 2 shown.

[0050] Step 2: According to the leaching rate curve Figure 2 It can be seen that the leaching time required to achieve a gold leaching rate of 60% is 5h50min. After testing, the liquid gold grade in the slurry is 0.93g / m 3 ; Prepare slurry samples with a leaching time of 5h50min.

[0051] Step 3: Take 1g of the activated carbon sample after grinding and pretreatment, place it in 100ml of the slurry sample in step 2 for stirring and adsorption. After 8h of adsorption, stop stirring and take out the activated carbon sample, and test the liquid gold grade β i , the activated carbon was placed in another portion with a grade of 0.93g / m 3 Adsorbed in the slurry, and repeated until β i ≈0.93g / m 3 , stop adsorption.

[0052] Step 4: According to the test results in step 3, calculate the gold grade of activated carbon under different adsorption time conditions;

[0053] Step 5: Draw a curve of adsorption time and activated carbon grade based on the calculation results in step 4, such as Figure 3 As shown by Figure 3 It can be seen that the noble liquid grade is 0.93g / m 3 Under the above conditions, the saturated adsorption capacity of activated carbon is 4892g / t. The designed gold-bearing carbon grade of the carbon pulp plant is 3500g / t. It can be seen from the figure that the corresponding adsorption time is 63.70h, which is the adsorption time required for carbon extraction in the carbon pulp plant.

[0054] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the protection scope of the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention. These simple variations all belong to the protection scope of the present invention.

[0055] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0056] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for determining the carbon extraction time of a carbon pulp plant, characterized in that The following steps are involved: Step 1: Prepare ore pulp with grinding fineness and ore mass concentration that meet the production process requirements, add lime and sodium cyanide to the ore pulp for cyanide leaching; at the same time, control the cyanide leaching time of the ore pulp, and calculate the gold leaching rate under different leaching time conditions by testing the gold grade of the leached residue under different leaching time conditions, and draw a leaching time and leaching rate curve; Step 2: Find the leaching time required for the leaching rate to reach the preset requirement in the curve obtained in step 1, prepare n slurry samples with a volume of V, and make each slurry sample leached according to the leaching time, so the liquid gold grade in each slurry sample is recorded as β0; Step 3: Take the pretreated activated carbon and place it in one of the slurry samples with a liquid gold grade of β0 and a volume of V in step 2 for stirring and adsorption, and analyze the liquid gold grade of β1 in the slurry sample after activated carbon adsorption; then place the activated carbon in the second slurry sample for stirring and adsorption, and analyze the liquid gold grade of β2 in the second slurry sample after activated carbon adsorption. The adsorption time for each time is 6h~8h, and this is repeated until β i Stop the adsorption when it remains unchanged for at least two times in a row, where i = 1, 2, 3...n, record the total adsorption time T of the activated carbon in different slurry samples at this time, and test the gold grade βc of the activated carbon; Step 4: According to the liquid gold grade test results in step 3, calculate the activated carbon gold grade θ under different adsorption time conditions t , the calculation formula is Where t is the adsorption time, i = 1, 2, 3...n, M is the mass of activated carbon; Step 5: Based on the θ calculated in step 4 t , draw a curve of activated carbon gold grade changing with adsorption time, and find the adsorption time Tx required to reach the preset gold grade of gold-loaded carbon in the curve, which is the carbon extraction time; In step 3, the ratio between the mass of activated carbon and the volume V of the slurry sample is 10 g / L to 20 g / L; The gold grade of activated carbon under different adsorption time conditions calculated in step 4 refers to the cumulative gold grade.

2. A method for determining the carbon extraction time of a carbon pulp plant according to claim 1, characterized in that In step 1, the ore pulp that meets the production process requirements has a grinding fineness of -0.074mm and a content of 80% to 95%, a mass concentration of the ore pulp of 40% to 50%, and a leaching time interval of 2h to 12h for the gold grade of the slag under different leaching times.

3. A method for determining the carbon extraction time of a carbon pulp plant according to claim 1, characterized in that In step 2, the leaching rate is usually preset to be 40% to 65% by mass.

4. A method for determining the carbon extraction time of a carbon pulp plant according to claim 1, characterized in that In the step 3, the activated carbon is activated carbon that has been pre-treated by grinding, and the particle size is 6 mesh to 18 mesh.

5. A method for determining the carbon extraction time of a carbon pulp plant according to claim 1, characterized in that In step 5, the preset gold grade for producing gold-loaded carbon is 2000 g / t to 4000 g / t.

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