A method for grading desulfurization of a sedimentary high-sulfur bauxite

Abstract

The application relates to the technical field of mineral processing, in particular to a grading desulfurization method for sedimentary high-sulfur bauxite; the method comprises the following steps: first grinding the sedimentary high-sulfur bauxite to obtain a first grinding product; performing rough flotation desulfurization on the first grinding product to obtain a rough flotation froth and a rough flotation underflow; grading the rough flotation underflow to obtain coarse-grained aluminum ore and fine-grained aluminum ore; secondly grinding the coarse-grained aluminum ore to obtain a second grinding product; combining the second grinding product and the fine-grained aluminum ore, and then performing clean flotation desulfurization to obtain aluminum concentrate; and performing scavenging flotation desulfurization on the rough flotation froth to obtain sulfur concentrate. The method can effectively dissociate the complexly-embedded and fine-grained pyrite in the sedimentary high-sulfur bauxite by introducing grading grinding in the process of grading desulfurization, so that the desulfurization effect of the sulfur minerals in the sedimentary high-sulfur bauxite can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mineral processing, and particularly relates to a grading desulfurization method for sedimentary high-sulfur bauxite. BACKGROUND

[0002] Compared with conventional high-sulfur bauxite, the sulfur content of sedimentary high-sulfur bauxite is generally higher (≥6%), and the sulfur minerals in the sedimentary high-sulfur bauxite have the characteristics of fine embedded particle size and complex embedded relationship, so it is difficult to grind and dissociate the sedimentary high-sulfur bauxite.

[0003] At present, the high-sulfur bauxite is mostly removed of sulfur by using the flotation desulfurization method or the combined use of the gravity separation and the flotation desulfurization method, but the embedded particle size of the sulfur minerals in the sedimentary high-sulfur bauxite is fine, and the sulfur minerals with the fine embedded particle size are difficult to be adsorbed on the surface of the sulfur minerals in the flotation desulfurization stage, so it is difficult to effectively remove the sulfur elements in the sulfur minerals.

[0004] The present application provides a grading desulfurization method for a sedimentary high-sulfur bauxite, to solve the technical problem of how to improve the removal efficiency of sulfur minerals in the sedimentary high-sulfur bauxite. SUMMARY

[0005] The present application provides a grading desulfurization method for a sedimentary high-sulfur bauxite, to solve the technical problem of how to improve the removal efficiency of sulfur minerals in the sedimentary high-sulfur bauxite.

[0006] In a first aspect, the application provides a method for grading desulfurization of sedimentary high-sulfur bauxite, the method comprising:

[0007] first grinding the sedimentary high-sulfur bauxite to obtain a primary grinding product;

[0008] roughing flotation desulfurization is performed on the primary grinding product to obtain a roughing flotation froth and a roughing flotation underflow, respectively;

[0009] the roughing flotation underflow is graded to obtain a coarse-grained aluminum ore and a fine-grained aluminum ore, respectively;

[0010] second grinding is performed on the coarse-grained aluminum ore to obtain a secondary grinding product;

[0011] the secondary grinding product and the fine-grained aluminum ore are combined and then subjected to cleaning flotation desulfurization to obtain an aluminum concentrate;

[0012] sweeping flotation desulfurization is performed on the roughing flotation froth to obtain a sulfur concentrate;

[0013] The cleaning flotation desulfurization includes an initial-stage cleaning flotation desulfurization and a terminal-stage cleaning flotation desulfurization, and the pH value of the initial-stage cleaning flotation desulfurization is greater than that of the terminal-stage cleaning flotation desulfurization.

[0014] The sweeping flotation desulfurization includes an initial-stage sweeping flotation desulfurization and a terminal-stage sweeping flotation desulfurization, and the pH value of the initial-stage sweeping flotation desulfurization is greater than that of the terminal-stage sweeping flotation desulfurization.

[0015] Optionally, the pH value of the cleaning flotation desulfurization is 2-4.

[0016] Optionally, the pH value of the sweeping flotation desulfurization is 3-5.

[0017] Optionally, the pH value of the roughing flotation desulfurization is 3-5.

[0018] Optionally, the weight m1 of sulfur element in the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship: m1:m2≥0.06.

[0019] The embedded particle size of sulfur minerals in the sedimentary high-sulfur bauxite is less than 20 μm.

[0020] Optionally, the primary grinding product includes a first fine-grained grinding product, and the weight m3 of the first fine-grained grinding product and the weight m4 of the primary grinding product satisfy the relationship: m3:m4=0.75-0.85.

[0021] Optionally, the particle size of the first fine-grained grinding product is less than or equal to 0.074 mm.

[0022] Optionally, the secondary grinding product includes a second fine grinding product, and the weight m5 of the second fine grinding product and the weight m6 of the secondary grinding product satisfy the relationship: m5:m6=0.90-0.95.

[0023] Optionally, the second fine grinding product has a particle size of ≤0.038 mm.

[0024] Optionally, the classified particle size is 0.038-0.053 mm.

[0025] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0026] The embodiment of the present application provides a kind of grading desulfurization method of sedimentary high-sulfur bauxite, the method comprises: first grinding is carried out to sedimentary high-sulfur bauxite, to obtain first grinding product;The first grinding product is carried out roughing flotation desulfurization, to obtain roughing foam and roughing underflow respectively;The roughing underflow is classified, to obtain coarse-grained aluminum ore and fine-grained aluminum ore respectively;Second grinding is carried out to the coarse-grained aluminum ore, to obtain second grinding product;The second grinding product and the fine-grained aluminum ore are combined, and then cleaned flotation desulfurization is carried out, to obtain aluminum concentrate;The roughing foam is carried out cleaning flotation desulfurization, to obtain sulfur concentrate;Wherein, the cleaned flotation desulfurization includes initial section cleaned flotation desulfurization and end point section cleaned flotation desulfurization, the acid-base degree of initial section cleaned flotation desulfurization is greater than or equal to the acid-base degree of end point section cleaned flotation desulfurization;The cleaning flotation desulfurization includes initial section cleaning flotation desulfurization and end point section cleaning flotation desulfurization, the acid-base degree of initial section cleaning flotation desulfurization is greater than or equal to the acid-base degree of end point section cleaning flotation desulfurization.The grading desulfurization method is first carried out to sedimentary high-sulfur bauxite, to promote the preliminary dissociation of sulfur element in sedimentary high-sulfur bauxite from sulfur mineral, to obtain first grinding product including different dissociation degree of sulfur mineral, then the sulfur mineral with higher dissociation degree is separated out using roughing flotation desulfurization, and the roughing underflow with sulfur mineral with poor dissociation degree is obtained, and the roughing underflow with sulfur mineral with poor dissociation degree can be further screened and dissociated by classification and second grinding, to promote the further dissociation of sulfur mineral and roughing underflow, to obtain second grinding product with less sulfur content, and finally the second grinding product is carried out cleaned flotation desulfurization, and the cleaned flotation desulfurization can include initial section cleaned flotation desulfurization and end point section cleaned flotation desulfurization, and the acid-base degree of initial section cleaned flotation desulfurization is greater than or equal to the acid-base degree of end point section cleaned flotation desulfurization, so that the second grinding product and the fine-grained aluminum ore can be fully desulfurized by cleaned flotation desulfurization, to obtain pure aluminum concentrate, so that the removal effect of sulfur mineral in sedimentary high-sulfur bauxite can be improved; in addition, the roughing foam is carried out cleaning flotation desulfurization, and the cleaning flotation desulfurization can include initial section cleaning flotation desulfurization and end point section cleaning flotation desulfurization, and the acid-base degree of initial section cleaning flotation desulfurization is greater than or equal to the acid-base degree of end point section cleaning flotation desulfurization, so that the sulfur mineral in roughing foam can be separated out by cleaning flotation desulfurization, to obtain pure sulfur concentrate, so that the sulfur mineral in sedimentary high-sulfur bauxite can be recovered, to improve the removal effect of sulfur mineral in sedimentary high-sulfur bauxite. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings incorporated into the specification and constituting a part of the specification, show embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0029] Figure 1 A flowchart of a grading desulfurization method of a sedimentary high-sulfur bauxite provided by the embodiments of the present application;

[0030] Figure 2 An actual flowchart of a grading desulfurization method of a sedimentary high-sulfur bauxite provided by the embodiments of the present application. DETAILED DESCRIPTION

[0031] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of protection of the present application.

[0032] The various embodiments of the present application can exist in the form of a range; it should be understood that the description in the form of a range is only for the convenience and brevity, and should not be understood as a hard limit on the scope of the present application; therefore, it should be considered that the described range has specifically disclosed all possible sub-ranges and single values in the range; for example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers in the range, such as 1, 2, 3, 4, 5 and 6, which applies to any range; in addition, whenever a numerical range is indicated in this document, it refers to any cited number (fraction or integer) in the indicated range.

[0033] In this document, the terms "comprise" and "comprising" and the like refer to a "consisting of", "consists of", and the like. Relative terms such as "first" and "second" and the like can be used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. "At least one" means one or more and "multiple" means two or more; "at least one of a, b, or c" and "at least one of a, b, and c" mean "a" alone, "b" alone, "c" alone, "a-b", "a-c", "b-c", or "a-b-c", where "a", "b", and "c" can be single items or multiple items. Unless otherwise specified, all materials, reagents, and equipment used in this application are commercially available or can be prepared by known methods.

[0034] It should be noted that, for the prior art (1) and the prior art (2) described in the background art, the inventors found that because the embedded particle size of sulfur minerals in the sedimentary high-sulfur bauxite is relatively fine, the sulfur content in the aluminum concentrate after flotation desulfurization is relatively high, so these aluminum concentrates cannot meet the requirements of being used as raw materials for producing alumina. For the prior art (3) described in the background art, the inventors found that this method can only control the particle size of the high-sulfur bauxite by grinding and dissociation, and the content of the aluminum concentrate in the fine particle product obtained is small and the sulfur content is low, and in addition, if the sedimentary high-sulfur bauxite is used as a raw material, a fine particle aluminum concentrate with a particle size of 300 mesh or less can be obtained after grinding, but the sulfur content in the fine particle aluminum concentrate will be ≥6%. For the prior art (4) and the prior art (5) described in the background art, the inventors found that during the treatment of the sedimentary high-sulfur bauxite by the combined method of flotation desulfurization and gravity separation, because the embedded particle size of sulfur minerals in the sedimentary high-sulfur bauxite is generally relatively fine, the sulfur content in the gravity separation aluminum concentrate obtained after gravity separation desulfurization is still relatively high, which shows that the combined method of flotation desulfurization and gravity separation for the sedimentary high-sulfur bauxite reduces less sulfur element and cannot meet the use requirements of low sulfur content in the aluminum concentrate.

[0035] Figure 1 An exemplary flowchart of a grading desulfurization method for a sedimentary high-sulfur bauxite provided by an embodiment of the present application is shown;

[0036] Figure 2 An exemplary actual flowchart of a grading desulfurization method for a sedimentary high-sulfur bauxite provided by an embodiment of the present application is shown;

[0037] As Figure 1 and Figure 2As shown, the embodiment of the present application provides a grading desulfurization method for sedimentary high-sulfur bauxite, which comprises the following steps:

[0038] S1. First grinding of the sedimentary high-sulfur bauxite to obtain a first grinding product;

[0039] S2. Roughing flotation desulfurization of the first grinding product to obtain a roughing flotation froth and a roughing flotation underflow, respectively;

[0040] S3. Grading of the roughing flotation underflow to obtain a coarse-grained aluminum ore and a fine-grained aluminum ore, respectively;

[0041] S4. Second grinding of the coarse-grained aluminum ore to obtain a second grinding product;

[0042] S5. Merging of the second grinding product and the fine-grained aluminum ore, followed by cleaning flotation desulfurization to obtain an aluminum concentrate;

[0043] S6. Scavenging flotation desulfurization of the roughing flotation froth to obtain a sulfur concentrate;

[0044] The cleaning flotation desulfurization comprises an initial-stage cleaning flotation desulfurization and an end-stage cleaning flotation desulfurization, and the pH value of the initial-stage cleaning flotation desulfurization is greater than that of the end-stage cleaning flotation desulfurization.

[0045] The scavenging flotation desulfurization comprises an initial-stage scavenging flotation desulfurization and an end-stage scavenging flotation desulfurization, and the pH value of the initial-stage scavenging flotation desulfurization is greater than that of the end-stage scavenging flotation desulfurization.

[0046] It should be noted that the first grinding and the second grinding can be performed by ball milling or rod milling.

[0047] It should be noted that, in addition to the initial-stage cleaning flotation desulfurization and the end-stage cleaning flotation desulfurization, the cleaning flotation desulfurization can also comprise multiple intermediate-stage cleaning flotation desulfurizations.

[0048] It should be noted that, in addition to the initial-stage scavenging flotation desulfurization and the end-stage scavenging flotation desulfurization, the scavenging flotation desulfurization can also comprise multiple intermediate-stage scavenging flotation desulfurizations.

[0049] In some optional embodiments, the pH value of the cleaning flotation desulfurization is 2-4.

[0050] In these embodiments, the pH value of the cleaning flotation desulfurization can be 2-4, and the second grinding product and the fine-grained aluminum ore can be sufficiently desulfurized by the multiple-stage cleaning flotation desulfurization to obtain a pure aluminum concentrate, thereby improving the removal effect of sulfur minerals in the sedimentary high-sulfur bauxite.

[0051] The acid-base value of the flotation desulfurization cleaning can be 2, 2.5, 3.0, 3.5 or 4.0.

[0052] In some alternative embodiments, the acid-base value of the flotation desulfurization scavenging is 3-5;

[0053] In these embodiments, the acid-base value of the flotation desulfurization scavenging can be 3-5, the flotation desulfurization scavenging can be used to separate the sulfur minerals in the roughing froth, and the pure sulfur concentrate can be obtained, so that the sulfur minerals in the sedimentary high-sulfur bauxite can be recovered, and the removal effect of the sulfur minerals in the sedimentary high-sulfur bauxite can be improved.

[0054] The acid-base value of the flotation desulfurization scavenging can be 3.0, 3.5, 4.0, 4.5 or 5.0.

[0055] In some alternative embodiments, the acid-base value of the flotation desulfurization cleaning is 3-5;

[0056] In these embodiments, the acid-base value of the flotation desulfurization cleaning can be 3-5, the flotation desulfurization cleaning can be used to separate the sulfur minerals in the roughing froth, and the pure sulfur concentrate can be obtained, so that the sulfur minerals in the sedimentary high-sulfur bauxite can be recovered, and the removal effect of the sulfur minerals in the sedimentary high-sulfur bauxite can be improved.

[0057] The acid-base value of the flotation desulfurization cleaning can be 3.0, 3.5, 4.0, 4.5 or 5.0.

[0058] In some alternative embodiments, the weight m1 of the sulfur element in the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship: m1:m2≥0.06;

[0059] The embedded particle size of the sulfur minerals in the sedimentary high-sulfur bauxite is <20 μm.

[0060] In these embodiments, the weight m1 of the sulfur element in the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite can satisfy the relationship: m1:m2≥0.06, which indicates that the sulfur content in the sedimentary high-sulfur bauxite is too high; in addition, the embedded particle size of the sulfur minerals in the sedimentary high-sulfur bauxite is generally <20 μm, which indicates that the embedded complexity of the sulfur minerals in the sedimentary high-sulfur bauxite is complex and the embedded particle size is fine, so that the specific fineness control of the primary grinding product can be determined subsequently, so as to promote the first grinding to achieve the best separation effect.

[0061] In some alternative embodiments, the primary grinding product includes a first fine-grained grinding product, and the weight m3 of the first fine-grained grinding product and the weight m4 of the primary grinding product satisfy the relationship: m3:m4=0.75-0.85;

[0062] In these embodiments, the primary grinding product can include a first fine-grained grinding product, and the weight m3 of the first fine-grained grinding product and the weight m4 of the primary grinding product can satisfy the relationship: m3:m4 = 0.75-0.85, which can promote the preliminary dissociation of the sulfur minerals in the sedimentary high-sulfur bauxite to obtain sulfur minerals with different degrees of dissociation.

[0063] The weight m3 of the first fine-grained grinding product and the weight m4 of the primary grinding product can satisfy the relationship:

[0064] m3:m4 = 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, or 0.85.

[0065] In some alternative embodiments, the particle size of the first fine-grained grinding product is ≤0.074 mm;

[0066] In these embodiments, the particle size of the first fine-grained grinding product is generally ≤0.074 mm, which can promote the first fine-grained grinding product to have sufficiently small particles to facilitate the flotation desulfurization roughing, thereby preliminarily separating the sulfur minerals with different degrees of dissociation in the sedimentary high-sulfur bauxite.

[0067] In some alternative embodiments, the secondary grinding product includes a second fine-grained grinding product, and the weight m5 of the second fine-grained grinding product and the weight m6 of the secondary grinding product satisfy the relationship: m5:m6 = 0.90-0.95;

[0068] In these embodiments, the coarse-grained aluminum ore contains sulfur minerals with fine embedded particle sizes that are not dissociated, and the secondary grinding product can include a second fine-grained grinding product, and the weight m5 of the second fine-grained grinding product and the weight m6 of the secondary grinding product can satisfy the relationship: m5:m6 = 0.90-0.95, which can effectively separate the sulfur minerals with fine embedded particle sizes that are not dissociated in the coarse-grained aluminum ore through secondary grinding, thereby improving the removal effect of the sulfur minerals in the sedimentary high-sulfur bauxite.

[0069] The weight m5 of the second fine-grained grinding product and the weight m6 of the secondary grinding product can satisfy the relationship:

[0070] m5:m6 = 0.90, 0.91, 0.92, 0.93, 0.94, or 0.95.

[0071] In some alternative embodiments, the particle size of the second fine-grained grinding product is ≤0.038 mm;

[0072] In these embodiments, the second fine grinding product has a particle size of generally ≤0.038 mm, which indicates that the second grinding can effectively separate the un-dissociated sulfur minerals with coarse particle size from the coarse fraction of the aluminum ore, thereby improving the removal of the sulfur minerals from the sedimentary high-sulfur bauxite.

[0073] In some alternative embodiments, the classified particle size is 0.038 mm to 0.053 mm.

[0074] In these embodiments, the classified particle size can be 0.038 mm to 0.053 mm, which can further separate the roughing underflow of the sulfur minerals with poor dissociation degree, so as to further dissociate the sulfur minerals from the roughing underflow, obtain a secondary grinding product with less sulfur content, and improve the effect of the subsequent flotation desulfurization cleaning, thereby improving the removal of the sulfur minerals from the sedimentary high-sulfur bauxite.

[0075] The classified particle size can be 0.038 mm, 0.039 mm, 0.040 mm, 0.041 mm, 0.042 mm, 0.043 mm, 0.044 mm, 0.045 mm, 0.046 mm, 0.047 mm, 0.048 mm, 0.049 mm, 0.050 mm, 0.051 mm, 0.052 mm, or 0.053 mm.

[0076] It should be noted that if the classified particle size is less than 0.038 mm, the second grinding stage will be overground, which will cause difficulties in the subsequent flotation desulfurization cleaning; if the classified particle size is more than 0.053 mm, the classification will not be sufficient, which will affect the subsequent second grinding and thus affect the separation effect of the subsequent flotation desulfurization cleaning.

[0077] The present application will be further described below in conjunction with specific examples. In the following examples, the experimental methods not specified in the specific conditions are generally determined according to the industry standards; if there is no corresponding industry standard, the general international standards, conventional conditions, or the conditions suggested by the manufacturers are used.

[0078] Example 1

[0079] As shown in Figure 1 and Figure 2 , a classification desulfurization method of a sedimentary high-sulfur bauxite includes:

[0080] S1. performing first grinding on the sedimentary high-sulfur bauxite to obtain a primary grinding product;

[0081] S2. performing flotation desulfurization roughing on the primary grinding product to obtain a roughing froth and a roughing underflow, respectively;

[0082] S3. The roughing underflow is classified to obtain coarse-grained aluminum ore and fine-grained aluminum ore respectively;

[0083] S4. The coarse-grained aluminum ore is secondly ground to obtain a second ground product;

[0084] S5. The second ground product and the fine-grained aluminum ore are combined and then subjected to a flotation desulfurization cleaning to obtain an aluminum concentrate;

[0085] S6. The roughing froth is subjected to a flotation desulfurization scavenging to obtain a sulfur concentrate.

[0086] The pH of the initial-stage flotation desulfurization cleaning is 3.5, the pH of the intermediate-stage flotation desulfurization cleaning is 3.0, and the pH of the terminal-stage flotation desulfurization cleaning is 3.0.

[0087] The pH of the initial-stage flotation desulfurization scavenging is 5, the pH of the intermediate-stage flotation desulfurization scavenging is 4.5, and the pH of the terminal-stage flotation desulfurization scavenging is 4.5.

[0088] The pH of the flotation desulfurization roughing is 4.0.

[0089] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0090] m1:m2 = 0.1576;

[0091] The embedded particle size of the sulfur minerals in the sedimentary high-sulfur bauxite is <20 μm.

[0092] The primary ground product includes a first fine-grained ground product, and the weight m3 of the first fine-grained ground product and the weight m4 of the primary ground product satisfy the relationship: m3:m4 = 0.85.

[0093] The particle size of the first fine-grained ground product is ≤0.074 mm.

[0094] The second ground product includes a second fine-grained ground product, and the weight m5 of the second fine-grained ground product and the weight m6 of the second ground product satisfy the relationship: m5:m6 = 0.90.

[0095] The particle size of the second fine-grained ground product is ≤0.038 mm.

[0096] The classification particle size is 0.038 mm.

[0097] Example 2

[0098] Based on the disclosure of Example 1, further modifications are made:

[0099] The pH value of the initial stage of the desulfurization cleaning flotation is 4.0, the pH value of the intermediate stage of the desulfurization cleaning flotation is 4.0, and the pH value of the terminal stage of the desulfurization cleaning flotation is 3.5.

[0100] The pH value of the initial stage of the desulfurization cleaning flotation is 4.0, the pH value of the intermediate stage of the desulfurization cleaning flotation is 4.0, and the pH value of the terminal stage of the desulfurization cleaning flotation is 3.5.

[0101] The pH value of the initial stage of the desulfurization cleaning flotation is 4.0, the pH value of the intermediate stage of the desulfurization cleaning flotation is 4.0, and the pH value of the terminal stage of the desulfurization cleaning flotation is 3.5.

[0102] The pH value of the initial stage of the desulfurization cleaning flotation is 4.0, the pH value of the intermediate stage of the desulfurization cleaning flotation is 4.0, and the pH value of the terminal stage of the desulfurization cleaning flotation is 3.5.

[0103] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0104] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0105] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0106] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0107] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0108] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0109] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0110] Example 3

[0111] On the basis of the disclosure of Example 1, further modifications are made:

[0112] The pH value of the initial stage of the desulfurization cleaning flotation is 4.0, the pH value of the intermediate stage of the desulfurization cleaning flotation is 4.0, and the pH value of the terminal stage of the desulfurization cleaning flotation is 3.5.

[0113] The pH value of the initial stage of the desulfurization cleaning flotation is 4.0, the pH value of the intermediate stage of the desulfurization cleaning flotation is 4.0, and the pH value of the terminal stage of the desulfurization cleaning flotation is 3.5.

[0114] The pH value of the initial stage of the desulfurization cleaning flotation is 4.0, the pH value of the intermediate stage of the desulfurization cleaning flotation is 4.0, and the pH value of the terminal stage of the desulfurization cleaning flotation is 3.5.

[0115] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0116] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0117] The embedded particle size of the sulfur minerals in the sedimentary high-sulfur bauxite is less than 20 μm.

[0118] The primary grinding product includes a first fine particle size grinding product, and the weight m3 of the first fine particle size grinding product and the weight m4 of the primary grinding product satisfy the relationship: m3:m4=0.78.

[0119] The particle size of the first fine particle size grinding product is less than or equal to 0.074 mm.

[0120] The secondary grinding product includes a second fine particle size grinding product, and the weight m5 of the second fine particle size grinding product and the weight m6 of the secondary grinding product satisfy the relationship: m5:m6=0.93.

[0121] The particle size of the second fine particle size grinding product is less than or equal to 0.038 mm.

[0122] The classification particle size is 0.038 mm.

[0123] Example 4

[0124] Based on the disclosure of Example 1, further modifications are made:

[0125] The pH value of the initial stage of the flotation desulfurization cleaning is 4.0, the pH value of the intermediate stage of the flotation desulfurization cleaning is 3.5, and the pH value of the terminal stage of the flotation desulfurization cleaning is 3.0.

[0126] The pH value of the initial stage of the flotation desulfurization scavenging is 6.0, the pH value of the intermediate stage of the flotation desulfurization scavenging is 5.0, and the pH value of the terminal stage of the flotation desulfurization scavenging is 5.0.

[0127] The pH value of the flotation desulfurization roughing is 5.0.

[0128] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0129] m1:m2=0.1095;

[0130] The embedded particle size of the sulfur minerals in the sedimentary high-sulfur bauxite is less than 20 μm.

[0131] The primary grinding product includes a first fine particle size grinding product, and the weight m3 of the first fine particle size grinding product and the weight m4 of the primary grinding product satisfy the relationship: m3:m4=0.82.

[0132] The particle size of the first fine particle size grinding product is less than or equal to 0.074 mm.

[0133] The secondary grinding product includes a second fine particle size grinding product, and the weight m5 of the second fine particle size grinding product and the weight m6 of the secondary grinding product satisfy the relationship: m5:m6=0.94.

[0134] The particle size of the second fine grinding product is ≤0.038mm.

[0135] The particle size of the classification is 0.038mm.

[0136] Example 5

[0137] Based on the disclosure of Example 1, further modifications are made:

[0138] The pH of the initial stage of the flotation desulfurization cleaning is 2.5, the pH of the intermediate stage of the flotation desulfurization cleaning is 2.5, and the pH of the terminal stage of the flotation desulfurization cleaning is 2.0.

[0139] The pH of the initial stage of the flotation desulfurization scavenging is 4.5, the pH of the intermediate stage of the flotation desulfurization scavenging is 4.0, and the pH of the terminal stage of the flotation desulfurization scavenging is 4.0.

[0140] The pH of the flotation desulfurization roughing is 4.3.

[0141] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship:

[0142] m1:m2=0.0882;

[0143] The embedded particle size of the sulfur minerals in the sedimentary high-sulfur bauxite is <20μm.

[0144] The primary grinding product includes a first fine grinding product, and the weight m3 of the first fine grinding product and the weight m4 of the primary grinding product satisfy the relationship: m3:m4=0.75.

[0145] The particle size of the first fine grinding product is ≤0.074mm.

[0146] The secondary grinding product includes a second fine grinding product, and the weight m5 of the second fine grinding product and the weight m6 of the secondary grinding product satisfy the relationship: m5:m6=0.95.

[0147] The particle size of the second fine grinding product is ≤0.038mm.

[0148] The particle size of the classification is 0.053mm.

[0149] Comparative Example 1

[0150] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship formula: m1:m2=0.0960 using the method described in the prior art (2) in the background art, and the sedimentary high-sulfur bauxite is ground to obtain a ground product; the ground product includes a first fine particle size ground product, and the weight m3 of the first fine particle size ground product and the weight m4 of the ground product satisfy the relationship formula: m3:m4=0.82.

[0151] The particle size of the first fine particle size ground product is ≤0.074 mm.

[0152] Lime is added to the ground product to adjust pH=8.

[0153] The ground product with lime adjustment pH=8 is subjected to a flotation desulfurization mode of "one roughing, three scavenging, and three cleaning" to obtain an aluminum concentrate.

[0154] Comparative Example 2

[0155] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship formula: m1:m2=0.0960 using the method described in the prior art (4) in the background art, and the sedimentary high-sulfur bauxite is ground to obtain a ground product; the ground product includes a first fine particle size ground product, and the weight m3 of the first fine particle size ground product and the weight m4 of the ground product satisfy the relationship formula: m3:m4=0.71.

[0156] The ground product is subjected to gravity separation desulfurization using a shaking table, the bed surface inclination angle used by the shaking table is 2.0°, the stroke used by the shaking table is 13 mm, and the stroke frequency used by the shaking table is 300 times / min to obtain gravity separation pyrite and gravity separation aluminum concentrate, the yield of the gravity separation pyrite is 8.32%, and the sulfur content of the pyrite is 43.33%; the gravity separation aluminum concentrate is directly subjected to flotation desulfurization using a non-drive flotation tank, the pH value of the gravity separation aluminum concentrate is adjusted to 9.0 using a pH value adjusting agent, and then a collector, a foaming agent, an activator, and a depressant are added to perform a flotation desulfurization mode of "one roughing, three cleaning, and three scavenging" to obtain flotation aluminum concentrate and flotation sulfur concentrate, the flotation aluminum concentrate is the final aluminum concentrate; and the flotation sulfur concentrate and the gravity separation pyrite are combined to form comprehensive sulfur concentrate.

[0157] Comparative Example 3

[0158] The weight m1 of the sulfur element of the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the relationship m1:m2=0.0608 using the method described in the prior art (2) in the background art, the sedimentary high-sulfur bauxite is ground to obtain a ground product; the ground product includes a first fine particle size ground product, and the weight m3 of the first fine particle size ground product and the weight m4 of the ground product satisfy the relationship m3:m4=0.85.

[0159] The particle size of the first fine particle size ground product is ≤0.074 mm.

[0160] Lime is added to the ground product to adjust pH=8.

[0161] The ground product with lime to adjust pH=8 is subjected to the flotation desulfurization mode of "one roughing, three scavenging, and three cleaning" to obtain an aluminum concentrate.

[0162] Related experiments and effect data:

[0163] The aluminum concentrate and the sulfur concentrate obtained in each example and the comparative example are collected, and the yield and the sulfur content are counted, and the results are shown in Table 1.

[0164] Table 1 shows the yield and the sulfur content of the aluminum concentrate and the sulfur concentrate obtained in each example and the comparative example.

[0165]

[0166] As shown in Table 1, the method for grading desulfurization of the sedimentary high-sulfur bauxite provided in the examples has a sulfur content of ≤0.4% in the aluminum concentrate and a sulfur content of ≥36% in the sulfur concentrate; the heavy flotation combined desulfurization and direct desulfurization in the comparative example still has a high sulfur content in the aluminum concentrate, which is greatly different from the examples, and is not suitable for desulfurization of the sedimentary high-sulfur bauxite with fine embedded particle size; for the sedimentary high-sulfur bauxite, appropriate grading grinding and grading flotation desulfurization conditions can further obtain an aluminum concentrate with low sulfur content and a sulfur concentrate with high sulfur content.

[0167] In summary, the method for grading desulfurization of the sedimentary high-sulfur bauxite provided in the examples introduces grading grinding in the process of grading desulfurization, which can effectively dissociate the complex embedded relationship and the fine embedded particle size of the pyrite in the sedimentary high-sulfur bauxite by using a two-stage grinding method, thereby improving the removal effect of the sulfur minerals in the sedimentary high-sulfur bauxite.

[0168] In addition, the method for grading desulfurization of the sedimentary high-sulfur bauxite provided in the examples can obtain an aluminum concentrate as a qualified raw material for producing alumina and a sulfur concentrate as a qualified raw material for producing sulfuric acid, thereby realizing the resource utilization of the sedimentary high-sulfur bauxite and the comprehensive utilization without waste discharge.

[0169] The foregoing detailed description of the application has been presented for purposes of illustration and description. Various modifications and changes can be made to the embodiments in light of the above detailed description without departing from the spirit and intended scope of the application. It is to be understood that the application can be practiced otherwise than as specifically described without altering its spirit or essential characteristics. Accordingly, the scope of the application should be judged in terms of the broadest allowable principles and features of the application, and not according to the above detailed description, which is to be viewed in all its novel aspects with the scope and spirit of the application.

Claims

1. A method for the fractional desulfurization of a sedimentary high-sulfur bauxite, characterized in that, The method includes: Sedimentary high-sulfur bauxite is subjected to a first grinding process to obtain a primary grinding product, which includes a first fine-grained grinding product. The weight m3 of the first fine-grained grinding product and the weight m4 of the primary grinding product satisfy the relationship: m3:m4=0.75~0.85, and the particle size of the first fine-grained grinding product is ≤0.074mm. The product from the first grinding process is subjected to flotation desulfurization and roughing to obtain roughing froth and roughing underflow, respectively. The coarse underflow is classified to obtain coarse-grained bauxite and fine-grained bauxite, respectively, wherein the particle size of the classification is 0.038 mm to 0.053 mm. The coarse-grained bauxite is subjected to a second grinding process to obtain a secondary grinding product, which includes a second fine-grained grinding product. The weight m5 of the second fine-grained grinding product and the weight m6 of the secondary grinding product satisfy the relationship: m5:m6=0.90~0.95, and the particle size of the second fine-grained grinding product is ≤0.038mm. The secondary grinding product and the fine-grained bauxite are combined and then subjected to flotation desulfurization and cleaning to obtain bauxite concentrate. The roughing froth is then subjected to flotation desulfurization and scavenging to obtain sulfur concentrate. The flotation desulfurization and purification process includes an initial stage flotation desulfurization and purification process and an end stage flotation desulfurization and purification process. The pH of the initial stage flotation desulfurization and purification process is greater than or equal to the pH of the end stage flotation desulfurization and purification process. The pH of the flotation desulfurization and purification process is 2 to 4. The flotation desulfurization scavenging includes an initial stage flotation desulfurization scavenging and an end stage flotation desulfurization scavenging. The pH of the initial stage flotation desulfurization scavenging is greater than or equal to the pH of the end stage flotation desulfurization scavenging. The pH of the flotation desulfurization scavenging is 3 to 5. The sulfur content in the aluminum concentrate is ≤0.4%, and the sulfur content in the sulfur concentrate is ≥36%.

2. The process for the graded desulfurization according to claim 1, characterized in that, The pH of the roughing flotation desulfurization process is 3 to 5.

3. The process for the graded desulfurization according to claim 1, characterized by, The weight m1 of sulfur in the sedimentary high-sulfur bauxite and the weight m2 of the sedimentary high-sulfur bauxite satisfy the following relationship: m1:m2≥0.06; The sulfur minerals in the sedimentary high-sulfur bauxite deposits have a particle size of <20 μm.

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