High-efficiency analysis system for high-sulfur and high-iron bauxite difficult to utilize

Abstract

The invention discloses a high-efficiency analysis system for high-sulfur high-iron bauxite difficult to utilize, which comprises the following steps: (1) crushing raw ore to-2mm, (2) weighing 500g of the raw ore in an XMQ-67 type 240mm * 90mm conical ball mill at a time, adjusting the ore pulp concentration to 40-90%, and (3) grinding the ore for a certain time, screening an ore grinding product by using a standard sieve with the pore diameter of 0.15 mm, directly recycling the oversize as concentrate, and feeding the undersize into a hanging groove type flotation machine for flotation; grinding and grading for multiple times, and uniformly mixing produced undersize products; (4) 500 g of undersize products are weighed at a time, the ore pulp concentration is fixed, and a pH adjusting agent, a dispersing agent, an inhibitor and a collecting agent are sequentially added for flotation; (5) filtering, drying, weighing, analyzing and calculating the recovery rate; according to the method, the bauxite is analyzed through experiments, the bauxite is better mined, the mining efficiency is improved, meanwhile, undeveloped bauxite can be planned and calculated in advance, experimental measurement and calculation can be better carried out, and the subsequent mining cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of bauxite flotation technology and provides a high-efficiency analysis system for high-sulfur, high-iron and difficult-to-utilize bauxite. Background Art

[0002] At present, with the development of high-quality bauxite in my country, bauxite resources with high aluminum and high aluminum-silicon ratio are very rare. Most of the bauxite currently processed is coal-based bauxite. The sulfur content of this bauxite is very high, usually high-sulfur bauxite. To develop and utilize this bauxite resource, desulfurization must be carried out to reduce the sulfur content in the mineral to below 0.3%. The factors affecting the desulfurization of high-sulfur bauxite are mainly because the beneficiation fineness of bauxite is very fine, and the sulfur content needs to be reduced to a very low level, which will affect production indicators and other issues. Research and exploration of efficient high-sulfur bauxite desulfurization flotation activators and improving the flotation utilization level of high-sulfur bauxite resources play an important role in comprehensively improving the technical level of the aluminum industry. In the previous high-sulfur bauxite desulfurization technology, copper sulfate or ferrous sulfate is often used to treat the pulp, and collectors and frothers are added for flotation after activation. This activator can only play a good activation role on the mineral in the pulp with little ore mud. In the high-sulfur bauxite pulp with a large amount of mud, the use of a single activator to obtain qualified concentrate indicators will inevitably cause a large amount of useful minerals to float, resulting in a decrease in flotation grade and recovery rate. The present invention has found that in the process of bauxite grinding, due to the serious mudification of bauxite, a large amount of minerals will be adhered to the steel balls during grinding, which greatly reduces the efficiency of grinding and increases energy consumption. In industrial production, it puts a great burden on the subsequent classification process. In the industrial application of bauxite, the aluminum-silicon ratio of bauxite is often required to reach a certain value, or impurities such as titanium, iron, and sulfur need to be removed. Especially in the production of alumina, the Bayer process with high efficiency, low consumption and simple process generally requires an aluminum-silicon ratio greater than 10. The sintering method for producing alumina requires the sulfur content of the bauxite ore to be less than 0.7%. For medium and low-grade co-existing bauxite, the vast majority of aluminum-silicon ratios are less than 10, which limits the economic and reasonable industrial application of such bauxite. The existing medium and low-grade co-existing bauxite is difficult to meet the actual use requirements. Guizhou Province is rich in bauxite resources, with a cumulative proven reserve of 440 million tons, making it a province with large bauxite resources after Shanxi. In addition to the Wuzhengdao area, Kaiyang area has also proven large bauxite deposits. The bauxite in this area is mainly sedimentary, with complex ore types, high aluminum silicate content and low aluminum-silicon ratio. Domestic and foreign scholars have conducted a lot of research on the flotation desiliconization of sedimentary bauxite, but there are only a few studies on the desiliconization of sedimentary bauxite unique to Guizhou Province. Conducting experimental research on the flotation desiliconization of low-grade bauxite in Kaiyang area to produce aluminum-containing raw materials suitable for sintering aluminum extraction will effectively promote the sustainable development of my country's aluminum industry. Summary of the invention

[0003] Purpose of the invention: In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide an efficient flotation method for medium- and low-grade and co-existing difficult-to-utilize bauxite that can be recycled and efficiently recover aluminum resources.

[0004] Technical solution: An efficient analysis system for high-sulfur, high-iron and difficult-to-use bauxite, characterized by: (1) crushing the raw ore to -2 mm; (2) weighing 500 g at a time and placing it in an XMQ-67 type 240 mm × 90 mm conical ball mill, and adjusting the slurry concentration to 40-90%; (3) after grinding for a certain period of time, sieving the grinding product with a standard sieve with an aperture of 0.15 mm, and directly recovering the ore on the sieve as concentrate, and flotation of the ore under the sieve in a hanging trough flotation machine; grinding and grading for multiple times, and mixing the sieve products evenly; (4) weighing 500 g of the sieve products at a time, fixing the slurry concentration, and sequentially adding a pH adjuster, a dispersant, an inhibitor, and a collector for flotation; (5) filtering, drying, weighing, analyzing, and calculating the recovery rate.

[0005] Specifically, the grinding time in step 3 is 3-6 minutes.

[0006] Specifically, in step 2, the bauxite flotation generally requires the pulp pH to be 8-10, and sodium carbonate is used as the pH adjuster. The adjuster dosage test was conducted under the conditions of 500 g / t sodium silicate, 50 g / t sodium hexametaphosphate, and 1 000 g / t CDK-1.

[0007] Specifically, in step 4, the pH adjuster, dispersant, inhibitor, and collector are sodium carbonate, sodium hexametaphosphate, sodium silicate, and sodium carbonate, respectively.

[0008] Beneficial effects:

[0009] The advantages of the present invention are:

[0010] The present invention discloses a sedimentary bauxite in Guizhou Province, which is a sand-crystal diaspore alumina with an Al2O3 grade of 43.29% and an aluminum-silicon ratio of 1.02. The main useful mineral is kaolinite, which is mixed with a small amount of clay minerals. The gangue minerals are mainly pyrite and pseudo-granular and powdery limonite and heavy minerals such as zircon and tourmaline. It is a low-iron and low-sulfur bauxite. (2) After the raw ore is ground to -0.15mm 93.00%, the aluminum-silicon ratio of +0.15mm particle size is as high as 10.18, which can be directly recovered as concentrate. Under the conditions of 500g / t of sodium carbonate as pH adjuster, 500g / t of sodium silicate as inhibitor, 25g / t of sodium hexametaphosphate as dispersant, and 1 000g / t of self-made collector CDK-1, the raw ore -0.15mm particle size is separated by 1 roughing 2 fines 1 sweeping closed-circuit flotation test, and a comprehensive aluminum concentrate composed of +0.15mm concentrate and flotation concentrate can be obtained, with good indicators of Al2O3 grade of 64.21%, aluminum-silicon ratio of 3.97, and recovery rate of 62.22%, meeting the requirements of sintering method for aluminum extraction. 93.00%. After the grinding products are screened, the products on the +0.15mm screen are directly recovered as concentrates. After the products under the screen are subjected to 1 roughing and 4 sweeping flotation, the roughing concentrate and the sweeping concentrate are combined for 4 rounds of concentration. The concentrated concentrate and the products on the screen are combined into a comprehensive aluminum concentrate. DETAILED DESCRIPTION

[0011] The present invention will be further described below in conjunction with specific embodiments.

[0012] It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as there is no conflict between them.

[0013] Example 1

[0014] An efficient analysis system for high-sulfur, high-iron and difficult-to-use bauxite is characterized by: (1) crushing the raw ore to -2 mm; (2) weighing 500 g at a time and placing it in an XMQ-67 type 240 mm × 90 mm conical ball mill, and adjusting the slurry concentration to 40%; (3) after grinding for a certain period of time, sieving the grinding product with a standard sieve with an aperture of 0.15 mm, recovering the ore above the sieve directly as concentrate, and flotation of the ore below the sieve in a hanging trough flotation machine; grinding and grading the ore multiple times, and mixing the sieve products uniformly; (4) weighing 500 g of the sieve products at a time, fixing the slurry concentration, and sequentially adding a pH adjuster, a dispersant, an inhibitor, and a collector for flotation; (5) filtering, drying, weighing, analyzing, and calculating the recovery rate.

[0015] Preferably, the grinding time in step 3 is 3 min.

[0016] Preferably, in the step 2, the positive flotation of bauxite generally requires the pulp pH to be 8, and sodium carbonate is used as the pH adjuster. The adjuster dosage test is carried out under the conditions of 500 g / t sodium silicate, 50 g / t sodium hexametaphosphate, and 1 000 g / t CDK-1.

[0017] Preferably, in step 4, the pH adjuster, dispersant, inhibitor and collector are sodium carbonate, sodium hexametaphosphate, sodium silicate and sodium carbonate respectively.

[0018] Example 2

[0019] A high-efficiency analysis system for high-sulfur, high-iron, and difficult-to-use bauxite, characterized by: (1) crushing the raw ore to -2 mm; (2) weighing 500 g at a time and placing it in an XMQ-67 type 240 mm × 90 mm conical ball mill, and adjusting the slurry concentration to 70%; (3) after grinding for a certain period of time, sieving the grinding product with a standard sieve with an aperture of 0.15 mm, recovering the ore above the sieve directly as a concentrate, and flotation of the ore below the sieve in a hanging trough flotation machine; grinding and grading the ore multiple times, and mixing the sieve products uniformly; (4) weighing 500 g of the sieve products at a time, fixing the slurry concentration, and sequentially adding a pH adjuster, a dispersant, an inhibitor, and a collector for flotation; (5) filtering, drying, weighing, analyzing, and calculating the recovery rate.

[0020] Preferably, the grinding time in step 3 is 4 minutes.

[0021] Preferably, in step 2, the pH of the slurry is generally required to be 9 for the bauxite positive flotation, and sodium carbonate is used as the pH adjuster. The adjuster dosage test is carried out under the conditions of 500 g / t sodium silicate, 50 g / t sodium hexametaphosphate, and 1 000 g / t CDK-1.

[0022] Preferably, in step 4, the pH adjuster, dispersant, inhibitor and collector are sodium carbonate, sodium hexametaphosphate, sodium silicate and sodium carbonate respectively.

[0023] Example 3

[0024] A high-efficiency analysis system for high-sulfur, high-iron, and difficult-to-use bauxite, characterized by: (1) crushing the raw ore to -2 mm; (2) weighing 500 g at a time and placing it in an XMQ-67 type 240 mm × 90 mm conical ball mill, and adjusting the slurry concentration to 90%; (3) after grinding for a certain period of time, sieving the grinding product with a standard sieve with an aperture of 0.15 mm, recovering the ore above the sieve directly as a concentrate, and flotation of the ore below the sieve in a hanging trough flotation machine; grinding and grading the ore multiple times, and mixing the sieve products uniformly; (4) weighing 500 g of the sieve products at a time, fixing the slurry concentration, and sequentially adding a pH adjuster, a dispersant, an inhibitor, and a collector for flotation; (5) filtering, drying, weighing, analyzing, and calculating the recovery rate.

[0025] Preferably, the grinding time in step 3 is 6 min.

[0026] Preferably, in step 2, the bauxite positive flotation generally requires the slurry pH = 10, sodium carbonate is used as the pH adjuster, and the adjuster dosage test is carried out under the conditions of 500 g / t of sodium silicate, 50 g / t of sodium hexametaphosphate, and 1 000 g / t of CDK-1.

[0027] Preferably, in step 4, the pH adjuster, dispersant, inhibitor and collector are sodium carbonate, sodium hexametaphosphate, sodium silicate and sodium carbonate respectively.

Claims

1. An efficient analysis system for high-sulfur, high-iron and difficult-to-use bauxite, characterized by: (1) crushing the raw ore to -2 mm; (2) weighing 500 g at a time and placing it in a XMQ-67 240 mm × 90 mm conical ball mill, adjusting the slurry concentration to 40-90%; (3) after grinding for a certain period of time, sieving the grinding product with a standard sieve with an aperture of 0.15 mm, recovering the ore above the sieve directly as the concentrate, and flotation of the ore below the sieve in a hanging trough flotation machine; grinding and grading the ore multiple times, and mixing the ore below the sieve uniformly; (4) weighing 500 g of the ore below the sieve at a time, fixing the slurry concentration, and sequentially adding a pH adjuster, a dispersant, an inhibitor, and a collector for flotation; (5) filtering, drying, weighing, analyzing, and calculating the recovery rate.

2. The high-efficiency analysis system for high-sulfur, high-iron and difficult-to-use bauxite according to claim 1 is characterized by: The grinding time in step 3 is 3-6 minutes.

3. The high-efficiency analysis system for high-sulfur, high-iron and difficult-to-use bauxite according to claim 1 is characterized by: In the step 2, the positive flotation of bauxite generally requires the pulp pH to be 8-10, and sodium carbonate is used as the pH adjuster. The adjuster dosage test was conducted under the conditions of 500 g / t sodium silicate, 50 g / t sodium hexametaphosphate, and 1 000 g / t CDK-1.

4. The high-efficiency analysis system for high-sulfur, high-iron and difficult-to-use bauxite according to claim 1 is characterized by: In step 4, the pH adjuster, dispersant, inhibitor and collector are sodium carbonate, sodium hexametaphosphate, sodium silicate and sodium carbonate respectively.