WO2010078787A1 - A laterite beneficiation process for enriching nickel and/or cobalt - Google Patents

Abstract

A beneficiation process for enriching nickel and/or cobalt involves the steps of dividing nickel laterite into limonite type ore and serpentine type ore to beneficiate separately; classifying by screening at least one time after washing the ore; beneficiating separately the products of the various grades obtained; further classifying by gravity separation and magnetic separation to obtain the target concentrate. The concentrate thus obtained by dividing said nickel laterite into limonite type ore and serpentine type ore to beneficiate separately provides higher quality and a higher recovery rate.

Description

 Instruction manual

Title of Invention: A laterite nickel ore beneficiation process enriched in nickel and/or cobalt

 Technical field

 [1] The present invention relates to a beneficiation process for enriching nickel and/or cobalt, in particular to a beneficiation process for enriching nickel and/or cobalt from laterite nickel ore, and more particularly to the treatment of lignite in laterite nickel ore. Separate ore dressing method for ore type and serpentine type ore. After the raw ore is first sieved and classified, the combined process of re-election and magnetic classification processes is used to concentrate and enrich nickel and/or cobalt to achieve the purpose of improving the grade.

 Background technique

 Background technique

 [2] According to the prior art, the beneficiation process of laterite nickel ore has methods such as magnetic separation and flotation.磁Using magnetic separation-flotation process to enrich nickel in the non-magnetic part, and then flotation, the obtained flotation concentrate is the available nickel resource, which can be leached. Flotation tailings due to the high grade of nickel, but not required, it is necessary to once again grind, sweep the concentrate to the leaching process, sweeping the tailings to abandon.

 [3] Because laterite nickel ore has low nickel content and complex composition, it is difficult to obtain concentrate by enrichment through traditional beneficiation process.

And the yield of nickel is very low. Flotation agents brought in by flotation also have an adverse effect on the environment.

 Disclosure of invention

 Summary of the invention

 [4] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a laterite ore dressing process enriched in nickel and/or cobalt, which has strong ore dressing, high grade of refined nickel, recovery of nickel and The enrichment ratio (enrichment multiple) is high.

 [5] Another object of the present invention is to provide a laterite nickel ore beneficiation process enriched in nickel and/or cobalt, which can be used as a concentrate for refining raw materials of Ni and Fe alloys, and to reduce the flow into the hydrometallurgical process. Processing volume.

 [6] Another object of the present invention is to provide a laterite nickel ore beneficiation process enriched in nickel and/or cobalt, which has a flexible process, and a magnetic separation device with a relatively small amount of material handling, multi-point configuration, can be Different requirements produce the corresponding products.

[7] Another object of the present invention is to provide a laterite nickel ore beneficiation process enriched in nickel and/or cobalt, which is designed Simple in preparation, low in energy consumption, cost-effective, and promising for industrial applications.

 Another object of the present invention is to provide a laterite nickel ore beneficiation process enriched in nickel and/or cobalt which is environmentally friendly.

 The object of the present invention can be achieved by the following method: A beneficiation process enriched in nickel and/or cobalt, characterized in that the limonite type ore and the serpentine type ore are separately subjected to beneficiation, limonite type ore and snake After the ore washing, the ore-type ore is subjected to at least one grading by using a sieve, and the products of each grade are separately beneficiated, and the refinement and magnetic grading process are performed to obtain the desired concentrate.

 Technical points according to the present invention include:

 1. Limonite ore and serpentine ore are separately selected;

 2. The limonite or serpentine raw material ore is respectively divided into two sieves and three grades, the primary sieve mesh is 0.9~1.0mm, and the secondary sieve mesh is 0.074~0.105mm;

 3. In step 2, the coarse-grained materials are not selected and directly enter the subsequent operation;

 4. In step 2, the medium-sized material enters the re-election process, and after re-election, two products of heavy product and light product are obtained. According to the product characteristics, heavy products containing relatively low nickel can be directly subjected to subsequent operations without magnetic separation, and the light products are further enriched into the final product through two magnetic separation processes.

 5. In step 2, the fine-grained materials are also re-elected to obtain two products: heavy products and light products. According to the product characteristics, heavy products with relatively low nickel content can be directly subjected to subsequent operations without magnetic separation. The light products are further enriched into the final product through two magnetic separation processes. The overflow can be directly entered into the product, or it can be passed once again. After magnetic separation and enrichment, they enter the product separately.

 6. The three products of the same name after the mineral processing of the three grade materials are combined to form the final product.

 The invention has the following advantages and effects:

 Limonite type ore, serpentine type ore, and their mixed ore are all difficult materials. The limonite type ore is a laterite ore with high iron content and low content of silicon and magnesium. The serpentine type contains Low-iron, iron-magnesium silicate nickel ore with high silicon and magnesium. Therefore, the limonite type ore and the serpentine type ore are separated and separated separately, and different process parameters can be set according to the difference in the properties of the limonite type ore and the serpentine type ore, thereby improving the pertinence of the beneficiation. This is one of the key technologies of the present invention.

Through screening, the coarse-grained materials directly enter the subsequent operation, which reduces the processing capacity of the selected ore, improves the selection of the selected fractions, and concentrates the raw materials with a certain particle size within a certain range, which is beneficial to improve The efficiency of the re-election process in the next step is the second key technology of the present invention.

[20] The purpose of re-election is to make the phase of similar density in the raw materials relatively concentrated, and arrange and arrange the magnetic separation process according to the characteristics of the obtained product to obtain a higher grade concentrate and a higher enrichment ratio. It is the third key technology of the present invention.

 [21] The multi-point configuration of the magnetic separation equipment, the flexible process, and the production of different products according to different requirements are the fourth key technology of the present invention.

[22] Another advantage of the present invention is that it is environmentally friendly.

 [23] Due to the low density of nickel oxide minerals and some magnetic properties, different process structures are formed by the combined process of re-election and magnetic classification processes, and the process flow suitable for nickel oxide ore selection is obtained. .

 Brief description of the drawing

[24] Figure 1 is a flow chart of the re-election-magnetic separation process of a limonite type/serpentine type ore sample.

 Best practice

 [25] As shown in FIG. 1, the beneficiation process flow from the limonite type ore comprises the following steps: an ore preparation step 11, a screening step 12, a reselection step 13, a magnetic separation step 14, a magnetic separation step 15, And a beneficiation product 16 produced by the magnetic separation process step.

 [26] In one embodiment of the reselection-magnetic separation combination process for producing a concentrate of interest from a limonite type ore, the following steps are specifically included:

 [27] A. After the ore sample is washed, it is wet-screened with a sieve of 1.0 mm and 0.076 mm, producing three grade products;

 [28] B. Products larger than lmm are not selected and directly enter the follow-up operation;

 [29] C, -l+0.076mm grain-level materials are selected by shaker, concentrate and tailings directly enter the product, and the medium ore is subjected to two magnetic separations to form different background field strengths through different excitation currents. Magnetic product

[30] After D and -0.076mm grain-level materials are sorted by shaker, the concentrate directly enters the subsequent operation. The medium ore, tailings, and overflow are enriched by magnetic fields of different magnetic field strengths respectively, and the corresponding magnetic properties are produced. After the ore has been sorted by economical and reasonable beneficiation process, its main useful components are enriched and become concentrates, which are the final products of the concentrator; tailings are the concentrating plants that grind the ore under specific economic and technical conditions. The waste discharged after the selection of the "useful component", that is, the solid waste remaining after the ore is selected for the concentrate; concentrate and Outside the tailings is called the middle mine.

[31] E. The products of the same name are combined to form the final product.

[32] In the present embodiment, the elemental analysis result of the limonite type ore is (%): Fe 28.48, Ni 1.05, Co 0.064, SP 0.055, As SiO ₂ 32.0, MgO 1.50, Ca 0.86, Cu 0.03, Pb

Zn 0.017, Al ₂ 0 ₃ 4.57, Mn 0 , Cr 1.65. The yield of nickel in the concentrate is 51.73%, the concentrate grade is 1.57%, and the enrichment ratio is 1.495. The yield of nickel in the medium ore is 37.14%, the recovery rate is 36.58%, and the metal grade is 1.04%. The yield of nickel was 21.97%, the recovery was 11.42%, and the metal grade was 0.53%.

 [33] The choice of mesh diameter is determined based on the results of the screening of the raw materials. In other embodiments, the primary screening mesh may be between 1 and 0.9 mm, the secondary screening mesh may be between 0.105 and 0.074 mm, and the magnetic separation step 15 may also be omitted, depending on the needs of the product being produced. The flexible arrangement and the corresponding adjustment of the magnetic field strength within a certain range can also achieve the object of the present invention.

 [34] As shown in FIG. 1, the beneficiation process flow from the serpentine type ore comprises the following steps: an ore preparation step 11, a screening step 12, a reselection step 13, a magnetic separation step 14, a magnetic separation step 15, And a beneficiation product 16 produced by the magnetic separation process step. Step 14 and step 15 are the magnetic separation process, which means that step 14 is a mandatory process. According to the difference of product characteristics, step 15 is an optional process, and step 14 of the magnetic separation process may be a magnetic separation process or two. In the magnetic separation process, step 14 in the embodiment includes two magnetic separation steps.

 [35] In one embodiment of the reselection-magnetic separation combination process for producing a concentrate of interest from a serpentine type ore, the following steps are specifically included:

 [36] A. After the ore sample is washed, it is wet-screened with a sieve of 1.0 mm and 0.076 mm to produce three grade products;

 [37] B. Products larger than lmm are not selected and directly enter the follow-up operation;

 [38] C, -l+0.076mm grain-level materials are selected by shaker, concentrate and tailings directly enter the product, and the medium ore is subjected to two magnetic separations to form different background field strengths through different excitation currents. Magnetic product

 [39] After the D and -0.076mm grain-level materials are sorted by the shaker, the middle ore is enriched by a magnetic separation to produce the corresponding magnetic products;

 [40] E. The products of the same name are combined to form the final product.

[41] In the present embodiment, the elemental analysis result of the serpentine type ore is (%): Fe 14.42, Ni 1.62, Co 0.045, S 0.01 s P 0.027 s As 0.13s SiO ₂ 45.0, MgO 10.62, Ca 0.62, Cu 0.016, Pb < 0.05 s Zn 0.013s Al ₂ 0 ₃ 2.75, Mn 0.16, Cr 0.69. The yield of nickel in the concentrate is 22.24%, the recovery rate is 28.79%, the concentrate grade is 2.05%, and the enrichment ratio is 1.29. The yield of nickel in the medium ore is 56.68%, the recovery rate is 60.21%, and the metal grade is 1.68%. The yield of medium nickel is 21.08%, the recovery rate is 11.00%, and the metal grade is 0.83%.

 [42] In other embodiments, the primary screening mesh may be between 1 and 0.9 mm, the secondary screening mesh may be between 0.105 and 0.074 mm, and the magnetic separation step 15 may also be omitted, depending on the product. A flexible arrangement is required, and the magnetic field strength is adjusted correspondingly within a certain range to achieve the object of the present invention. The re-election overflow can be directly entered into the product or further enriched by magnetic separation. Because the grade of nickel in the overflow is higher than that of the original ore, it is lower than the concentrate of the product, and directly enters the concentrate without magnetic separation. Thus, the metal recovery rate of the concentrate is higher, but the concentrate grade will be reduced. Conversely, after the overflow is magnetically selected, the portion enriched in nickel enters the concentrate, and the rest enters the middle ore. Thus, the grade of the concentrate is higher and the enrichment ratio is higher. However, the recovery rate of concentrates has also declined.

 [43] It should be noted that, through the above disclosure, those skilled in the art may make modifications, changes, and improvements in one form or another after being inspired by the present invention. However, these are all included in the protection of the claims. Within the scope.

Claims

Claim  [Claim 1] A beneficiation process enriched in nickel and/or cobalt, characterized in that the limonite type ore and the serpentine type ore are separately subjected to beneficiation, and the limonite type ore and the serpentine type ore are respectively washed. After the mine, the sieve is subjected to at least one grading, and the products of each grade are separately beneficiated, and the concentrate is subjected to re-election and magnetic classification to obtain the concentrate of interest.  [Claim 2] The method according to claim 1, wherein the limonite type ore and the serpentine type ore are respectively subjected to grading by using a sieve having a first sieve hole after washing, and then having a smaller diameter The sieve of the second sieve hole of the first sieve hole is subjected to secondary classification, and the products of three different grain sizes larger than the first sieve hole, smaller than the first sieve hole but larger than the second sieve hole and smaller than the second sieve hole are respectively beneficiated. The diameter of the first mesh hole is 0.9~1.0mm, and the diameter of the second mesh hole is 0.074~0.105mm.  [Claim 3] The method according to claim 2, wherein the first mesh has a diameter of 1.0 mm and the second mesh has a diameter of 0.076 mm.  [Claim 4] The method according to claim 1, characterized in that the nickel and/or cobalt, the limonite type ore and the serpentine type ore are enriched from the laterite nickel ore, respectively, and subjected to wet screening and classification, according to the raw materials. The difference between the density of minerals and the specific magnetic susceptibility, the products after wet sieving and grading are selected by the combined process of re-election and magnetic grading.  [Claim 5] The method according to claim 4, wherein the limonite ore beneficiation process comprises the following process steps:  After the wet sieving and grading, the coarse-grained material as a sieving sieve directly enters the subsequent operation;  After the re-election of the medium-grained material as the secondary screening sieve, the heavy product enters the subsequent operation, and the light product is further enriched by the magnetic separation process;  After the fine-grained material as the secondary screening sub-filing material is subjected to the magnetic separation grouping process, the magnetic separation products are further enriched by the re-election process, the heavy product enters the subsequent operation, and the light product is used as the purpose concentrate of the beneficiation operation;  Finally, the combination of the same name products constitutes the final product and sorting indicator of the process. [Claim 6] The method according to claim 4, characterized in that the serpentine type ore beneficiation process Includes the following process steps: After the wet screening and classification, the coarse-grained materials directly enter the follow-up operation; After the middle-grade materials are re-selected, the heavy products directly enter the subsequent operations, and the light products are further enriched by the magnetic separation process; After the fine-grained materials are re-selected, the heavy products directly enter the subsequent operations, and the light products are further enriched by the magnetic separation process; Finally, the combination of the same name products constitutes the final product and sorting indicator of the process.