Beneficiation flotation method with desliming effect

Abstract

The invention discloses a beneficiation flotation method with a desliming effect, and belongs to the technical field of mineral processing. The method comprises the steps that roughing tailing desilting is subjected to secondary separation through a parallel flotation series, and slurry is returned to a large concentration well to be circularly treated; the deslimed ore pulp is sequentially subjected to primary roughing, primary concentration and secondary concentration operation, and high-grade concentrate and tailings are separated; wherein the concentration and pretreatment process and parameters are optimized; flotation parameter control is optimized; a reagent system is optimized; a collecting agent is 34.32 + / -2kg / t of raw ore; a foaming agent: 1.36 + / -0.1 kg / t of raw ore; and water glass: 60.38 + / -5kg / t of raw ore. According to the flotation method for mineral separation with the desliming effect, efficient desliming and mineral recovery are achieved through the processes of desilting and re-separation, slurry re-concentration and stepped separation, the concentrate grade is improved, and the cost of per ton of ore is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and particularly relates to a flotation method for ore dressing with a slime removal effect. Background Art

[0002] Currently, the existing flotation process has the following problems when dealing with high-slime-containing ores:

[0003] Slime interference: Fine-grained slime adsorbs on the surface of minerals, hinders the action of reagents, and reduces flotation selectivity (see Patent CN105107646A);

[0004] Resource waste: The sand and slurry that are not scraped out in the traditional process are directly discarded, resulting in the loss of useful minerals (Literature "Flotation Tailings Resource Utilization Technology", 2019);

[0005] Low reagent efficiency: The unit consumption of collectors, frothers, and water glass is high, and the cost per ton of ore remains high (see Patent JP2020103456A).

[0006] Analysis of comparative technologies:

[0007] Patent "A Flotation Process for High-Slime-Containing Ores": A single flotation process is used to treat high-slime-containing ores, but the slime removal effect is poor and the utilization rate of tailings resources is low;

[0008] Literature "Flotation Tailings Resource Utilization Technology": Points out that the traditional tailings treatment method leads to the waste of undissociated minerals;

[0009] Patent "A Flotation Method with High-Dose Reagents": High-dose reagents are used to improve flotation efficiency, but the cost is too high. Summary of the Invention

[0010] In order to overcome the problems of serious slime interference, resource waste, and low reagent efficiency in the prior art, the purpose of the present invention is to provide a flotation method for ore dressing with a slime removal effect. Through re-election of the sand, return of the slurry to the thickening well for recycling treatment, and a stepped separation process, efficient slime removal and mineral recovery are achieved, the concentrate grade is improved, and the cost per ton of ore is reduced.

[0011] To solve the above technical problems, the present invention adopts the following technical solutions:

[0012] A flotation method for ore dressing with a slime removal effect according to the present invention, the sand in the rougher tailings is secondarily separated through a parallel flotation series, and the slurry is returned to the thickening well for cyclic treatment; after slime removal, the pulp sequentially enters the operations of one roughing, one cleaning, and two cleanings to separate high-grade concentrate and tailings; wherein:

[0013] Concentration and Pretreatment: The raw ore is a mixture of selected medium-grade iron tailings and Walter tailings, with an REO grade of 7-10% and a slime content of 16-20% (preferably 18%); during the concentration process, the concentration of the flotation feed is controlled to be 63%-76%, and the flow rate is 170-240 m 3 / h or 230-350 m 3 / h;

[0014] Flotation Parameter Control:

[0015] Temperature Gradient: Rough selection: 65°C - 80°C, first-stage cleaning: 60°C - 75°C, second-stage cleaning: 55°C - 70°C;

[0016] pH Gradient: Rough selection: pH 7.5 - 8.5, first-stage cleaning: pH 8.5 - 10, second-stage cleaning: pH 8.5 - 10.5;

[0017] Reagent System:

[0018] Collector: 34.32 ± 2 kg / t of raw ore;

[0019] Frother: 1.36 ± 0.1 kg / t of raw ore;

[0020] Sodium Silicate: 60.38 ± 5 kg / t of raw ore.

[0021] Furthermore, fatty acid compounds are used as collectors.

[0022] Furthermore, collector: 34.32 kg / t of raw ore.

[0023] Furthermore, pine oil is used as a frother.

[0024] Furthermore, frother: 1.36 kg / t of raw ore.

[0025] Furthermore, the flotation machine's air inlet pipeline is equipped with a porous ceramic diffuser, and the bubble diameter is 0.3 mm.

[0026] Furthermore, this method realizes efficient slime removal and mineral recovery, improves the concentrate grade and reduces the cost per ton of ore.

[0027] Compared with the existing technology, the beneficial technical effects of the present invention are:

[0028] 1. Improvement in separation indexes:

[0029] The REO grade of the concentrate is increased from 48.50 - 50% to 49 - 52%, and the recovery rate is ≥ 85%;

[0030] The comprehensive utilization rate of the tailings is increased from 50% to 62%.

[0031] 2. Cost reduction: The total cost per ton of ore is reduced from 650 yuan to 427 yuan, a decrease of 34.3%.

[0032] 3. Environmental protection benefits: The mud content of tailings is ≤ 5%, reducing environmental pollution. Brief description of the drawings

[0033] The present invention will be further described below in conjunction with the drawings.

[0034] Figure 1 is the flow chart of the flotation process;

[0035] Figure 2 is the comparison curve of the concentrate grade and the cost per ton of ore between the traditional process and the present invention;

[0036] Figure 3 is the bar chart of the comparison between the unit consumption of reagents and the resource utilization rate. Specific implementation manners

[0037] A flotation method for ore dressing with a mud removal effect, and its flotation process is collaboratively designed:

[0038] The sand of the rougher tailings is secondarily separated through a parallel flotation series, and the slurry is returned to the thickening sump for cyclic treatment;

[0039] After mud removal, the pulp enters the operations of one-stage rougher, one-stage cleaner and two-stage cleaner in sequence to separate high-grade concentrate and tailings;

[0040] Among them:

[0041] Concentration and pretreatment:

[0042] The raw ore is a mixture of medium-selected iron tailings and Walter tailings, with a REO grade of 7 - 10% and a slime content of 18%;

[0043] The concentration treatment controls the flotation feed concentration to be 63% - 76% and the flow rate to be 170 - 240 m 3 / h (single series) or 230 - 350 m 3 / h (double series);

[0044] Flotation parameter control:

[0045] Temperature gradient: rougher 65°C - 80°C, one-stage cleaner 60°C - 75°C, two-stage cleaner 55°C - 70°C;

[0046] pH gradient: rougher pH 7.5 - 8.5, one-stage cleaner pH 8.5 - 10, two-stage cleaner pH 8.5 - 10.5;

[0047] Reagent regime:

[0048] Collector (fatty acid compounds): 34.32 kg / t of raw ore;

[0049] Frother (pine oil): 1.36 kg / t of raw ore;

[0050] Sodium silicate: 60.38 kg / t of raw ore.

[0051] Example 1 (lower limit of parameters):

[0052] Characteristics of raw ore: REO grade 7%, slime content 18%;

[0053] Operating parameters:

[0054] Flotation feed concentration 68%, flow rate 170 m 3 / h;

[0055] Rougher flotation temperature 65°C, pH 7.5, collector 50 L / min, sodium silicate 6 L / min;

[0056] Effect: Concentrate REO grade 49%, recovery rate 75%.

[0057] Example 2 (intermediate value):

[0058] Characteristics of raw ore: REO grade 8.5%, slime content 18%;

[0059] Operating parameters:

[0060] Flotation feed concentration 70%, flow rate 200 m 3 / h;

[0061] Rougher flotation temperature 72°C, pH 8.0, collector 75 L / min, sodium silicate 8 L / min;

[0062] Effect: Concentrate REO grade 51%, recovery rate 78%.

[0063] Example 3 (upper limit of parameters):

[0064] Characteristics of raw ore: REO grade 10%, slime content 18%;

[0065] Operating parameters:

[0066] Flotation feed concentration 73%, flow rate 330 m 3 / h;

[0067] Rougher flotation temperature 80°C, pH 8.5, collector 90 L / min, sodium silicate 10 L / min;

[0068] Effect: Concentrate REO grade 52%, recovery rate 80%.

[0069] Key implementation points:

[0070] The collector is a fatty acid compound, and the unit consumption of the frother is 1.36 kg per ton of raw ore;

[0071] The aeration pipeline of the flotation machine is equipped with a porous ceramic diffuser, and the bubble diameter is 0.3 mm;

[0072] The slurry is subjected to secondary flotation on the underflow of the thickener at the bottom of the shaft, and the sand is recovered through the parallel-connected series.

[0073] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A flotation method for ore dressing with a mud removal effect, characterized in that: The roughly selected tailings sand is secondarily separated through a parallel flotation series, and the slurry is returned to the thickening sump for recycling treatment; after desliming, the pulp enters the primary roughing, primary cleaning, and secondary cleaning operations in sequence to separate high-grade concentrate and tailings; among which: Concentration and pretreatment: The raw ore is a mixture of medium-selected iron tailings and Walter tailings, with a REO grade of 7-10% and a mud content of 16-20%. The concentration process controls the flotation feed concentration to 63%-76% and the flow rate to 170-240m 3 / h or 230-350m 3 / h; Flotation parameter control: Temperature gradient: primary roughing 65°C - 80°C, primary cleaning 60°C - 75°C, secondary cleaning 55°C - 70°C; pH gradient: primary roughing pH 7.5 - 8.5, primary cleaning pH 8.5 - 10, secondary cleaning pH 8.5 - 10.5; Reagent system: Collector: 34.32 ± 2 kg / t of raw ore; Frother: 1.36 ± 0.1 kg / t of raw ore; Sodium silicate: 60.38 ± 5 kg / t of raw ore.

2. The flotation method for ore dressing with de-sludging effect according to claim 1, wherein: A fatty acid compound is used as the collector.

3. The flotation method for ore dressing with sludge removal effect according to claim 1 or 2, characterized in that: Collector: 34.32 kg / t of raw ore.

4. The flotation method for ore dressing with mud removal effect according to claim 1, wherein: Pine oil alcohol is used as the frother.

5. The flotation method for ore dressing with sludge removal effect according to claim 4, characterized in that: Frother: 1.36 kg / t of raw ore.

6. The flotation method for ore dressing with sludge removal effect according to claim 1, wherein: The air inlet pipeline of the flotation machine is equipped with a porous ceramic diffuser, and the bubble diameter is 0.3 mm.

7. The flotation method for ore dressing with sludge removal effect according to claim 1, characterized in that: This method realizes efficient desliming and mineral recovery, improves the concentrate grade and reduces the cost per ton of ore.

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