A graphite ore classification and separation process for protecting scales

Abstract

The present invention discloses a graphite ore classification and separation process that protects flakes. The process comprises the following steps: Step 1: The finely crushed graphite ore is sequentially fed into roughing I and roughing II as flotation ore, and the coarse concentrates are combined to obtain coarse concentrate 1; Step 2: The coarse concentrate 1 obtained in Step 1 is subjected to three alternating regrindings and four beneficiations to obtain concentrate 1; Step 3: The tailings from roughing II and the middlings from beneficiation I are combined and fed into a desludging process. The desludged product is then coarsely ground and fed into roughing III to obtain coarse concentrate 2. The coarse concentrate 2 is then subjected to six alternating regrindings and seven beneficiations to obtain concentrate 2. The process classifies the ore according to the feed particle size of the finely crushed product and the ground product, and while paying attention to the difference in floatability between graphite and gangue, it also pays attention to the separation of different gangues, thereby achieving the classification and separation of graphite ore. Compared with conventional processes, the large flake rate of the concentrate is increased by nearly 10 percentage points, thereby increasing the added value of the graphite concentrate product.

Description

Technical Field

[0001] The invention belongs to the field of graphite ore separation, and in particular relates to a graphite ore classification, quality classification and separation process for protecting flakes. Background Art

[0002] Crystalline graphite is a valuable non-metallic mineral, characterized by excellent high-temperature resistance, thermal conductivity, thermal shock resistance, and high lubricity. Widely used in metallurgy, machinery, chemicals, refractories, aerospace, national defense, and other fields, it is a key resource essential for the development of today's high-tech industries.

[0003] In recent years, although China's proven reserves of crystalline graphite have been increasing, the reserves of large-scale high-quality graphite with a particle size greater than 0.15 mm are less than 5 million tons.

[0004] Since crystalline graphite flakes cannot be artificially synthesized and have problems such as low reserves and easy damage during the selection process, and due to their superior performance and wide range of uses, their prices, especially those of large-scale flake graphite concentrates, have remained high and the market is in short supply. Therefore, protecting large graphite flakes has become an urgent research topic.

[0005] Studies have shown that graphite flakes can be protected by using graded grinding and flotation processes and rapid flotation processes. The graded grinding and flotation process is to select a concentrate from the selection process and perform a graded operation according to the particle size difference, so as to directly obtain the final concentrate or separate them separately; the rapid flotation process is to directly perform a rapid flotation of the entire particle size after the coarse grinding operation, and the flotation concentrate enters a subsequent selection operation and is subsequently selected together with the main process. Although the graded grinding and flotation processes are effective in protecting flakes, they also have the following shortcomings: 1. They are aimed at rough selection of the feed after the full-particle coarse grinding operation, and no research on flake recovery and protection of the original ore before the coarse grinding operation has been conducted. Existing research results show that when the fixed carbon grade of graphite ore is around 10% (the fixed carbon grade of the raw ore in the current graphite concentrator is also around 10%), the scales are more susceptible to damage. Therefore, under the current raw ore grade conditions, it is necessary to reduce the damage to the graphite scales in the raw ore during coarse grinding operations; 2. The gangue is not distinguished, and the differentiated adverse effects of different types of gangue on the flotation of graphite ore are ignored. Summary of the Invention

[0006] Purpose of the invention: In view of the above-mentioned deficiencies in the prior art, the present invention provides a graphite ore grading, quality classification and separation process with protected scales.

[0007] The principles of the graphite ore classification and separation process for protecting scales disclosed in the present invention are as follows:

[0008] Among the crushed products of graphite ore, the target mineral graphite mainly has four forms: graphite monomer, rich intergrowth, medium intergrowth and poor intergrowth, among which:

[0009] Graphite monomers are divided into large flakes and small flakes, usually with a particle size of 0.15mm as the boundary;

[0010] There are three main types of gangue minerals: kaolinite, illite, chlorite, limonite and other weathering easily argillizing minerals; quartz, feldspar, mica, amphibole, pyroxene and other relatively hard hydrophilic minerals; and pyrite and other metallic minerals with a large specific gravity. The research process found that these three types of gangue (i.e., easily argillizing minerals, hydrophilic minerals and metallic minerals) have the following three adverse effects on the improvement of graphite concentrate indicators during the flotation process:

[0011] 1. For highly weathered and easily argillized minerals, they are characterized by easy dissociation, fine particle size, and good floatability. They will preferentially enter the concentrate along with the target mineral graphite. As their particle size becomes finer, the entrainment phenomenon becomes more obvious, which will not only lower the concentrate grade, but also increase the number of regrinding and reselection, causing excessive damage to the scales.

[0012] 2. For hydrophilic minerals with relatively high hardness, although they are easy to separate from graphite minerals in terms of floatability, it is relatively difficult to dissociate them from graphite flakes. Moreover, such gangue is the main component that destroys flakes due to its high hardness and high wear resistance.

[0013] 3. For metallic minerals with a larger specific gravity and good floatability, the above two effects will be combined. However, since the content of such gangue is generally relatively low, the effect is not very obvious.

[0014] Based on the above analysis, the present invention proposes the following corresponding solutions:

[0015] (1) Weak stirring intensity and shallow liquid surface flotation are carried out on the finely crushed ore products before coarse grinding, focusing on recovering graphite monomers and rich intergrowths. The gangue carried here is mainly the easily muddy minerals mentioned above. The floating amount of the hydrophilic minerals and the metal minerals is relatively small at this time.

[0016] (2) The floating product in (1) is subjected to four rounds of selection with high reagent dosage, low pulp concentration and weak stirring intensity to remove the entrained easily muddy minerals and obtain high-grade large-scale flake graphite concentrate, i.e., concentrate 1, at the fastest speed.

[0017] (3) Desludging is performed on the coarse tailings of the finely crushed product to remove the muddy gangue and hydrophilic gangue that have been dissociated into monomers.

[0018] (4) The desludging product is subjected to coarse grinding, at which time the main processes are the medium-sized intergrowths and the poor-sized intergrowths.

[0019] in:

[0020] The first key point is to use ball milling with greater destructive power to specifically strengthen the separation of graphite from hard and hydrophilic gangues such as quartz and feldspar.

[0021] The second key point is that considering that this type of gangue is the main destroyer of graphite flakes, and according to research, the degree of flake damage of graphite ore with a fixed carbon grade of 20-40% is much lower than that with a fixed carbon grade of 40-60%. Therefore, the coarse concentrate of the coarsely ground product is subjected to the first re-grinding using a ball mill that is stronger than a stirred mill, and the stirred mill is used again for subsequent re-grinding. After several conventional concentrations, a graphite concentrate mainly composed of medium and fine flakes is obtained, namely, concentrate 2.

[0022] Technical solution: A graphite ore classification and separation process for protecting scales, the steps are as follows:

[0023] Step 1: The finely crushed graphite ore is fed into roughing I and roughing II in sequence as flotation ore, and the rough concentrates are combined to obtain rough concentrate 1;

[0024] Step 2: The coarse concentrate 1 obtained in step 1 is subjected to three alternating regrinding and four beneficiation steps to obtain concentrate 1. The three regrinding steps are all performed by a stirred mill. The three regrinding steps are regrinding I, regrinding II, and regrinding III, and the four beneficiation steps are beneficiation I, beneficiation II, beneficiation III, and beneficiation IV, wherein:

[0025] The tailings from the roughing II operation and the middlings from the cleaning I operation are combined into the desludging operation;

[0026] The ore from Concentrated II to Concentrated IV operations is merged and returned to Concentrated I;

[0027] Step 3: The deslimed product is coarsely ground in a ball mill and then enters roughing III to obtain a coarse concentrate 2. The coarse concentrate 2 is subjected to six re-grindings and seven cleanings in turn to obtain concentrate 2, wherein:

[0028] The six regrindings are regrinding IV, regrinding V, regrinding VI, regrinding VII, regrinding VIII and regrinding IX, wherein regrinding IV adopts a ball milling method, and regrinding V, regrinding VI, regrinding VII, regrinding VIII and regrinding IX adopt a stirred milling method;

[0029] The 7 selections are Selection V, Selection VI, Selection VII, Selection VIII, Selection IX, Selection X and Selection XI;

[0030] The tailings from the roughing III operation enter the scavenging I operation, and the tailings from the scavenging I operation are the final tailings;

[0031] The tailings from the Concentrator VI operation, the tailings from the Concentrator V operation, and the concentrate from the Scavenger I operation are combined and returned to the Rougher III operation;

[0032] The ores in the selection operations VII to XI are returned to the previous selection operation in sequence or returned to selection VI in a concentrated manner.

[0033] Furthermore, in terms of mass percentage, the particle size requirements of the finely crushed graphite ore product in step 1 are as follows:

[0034] -0.15mm content is at least 20%; -3mm content is 100%.

[0035] Furthermore, the process requirements for the roughing I operation in step 1 are as follows:

[0036] The stirring time is 2 to 5 minutes;

[0037] The flotation time is 5 to 10 minutes;

[0038] Based on the measurement of the graphite ore fine product, the roughing operation of step 1 uses diesel or kerosene as a collector in an amount of 1 to 150 g / t;

[0039] Based on the amount of the finely crushed graphite ore product, the roughing operation in step 1 uses a fusel alcohol foaming agent BK201 in an amount of 1 to 50 g / t.

[0040] Furthermore, the process requirements for the roughing II operation in step 1 are as follows:

[0041] The stirring time is 2 to 5 minutes;

[0042] The flotation time is 5 to 10 minutes;

[0043] Based on the measurement of the graphite ore fine product, the roughing II operation in step 1 uses diesel or kerosene as a collector in an amount of 1 to 120 g / t;

[0044] Based on the amount of the finely crushed graphite ore product, the roughing II operation in step 1 uses a fusel alcohol foaming agent BK201 in an amount of 1 to 50 g / t.

[0045] Furthermore, the process requirements for the roughing III operation in step 3 are as follows:

[0046] The stirring time is 2 to 5 minutes;

[0047] The flotation time is 5 to 10 minutes;

[0048] Based on the measurement of the graphite ore fine product, the roughing III operation in step 3 uses diesel or kerosene as a collector in an amount of 1 to 150 g / t;

[0049] Based on the amount of the finely crushed graphite ore product, the roughing III operation in step 3 uses a fusel alcohol foaming agent BK201 in an amount of 1 to 50 g / t.

[0050] Furthermore, the process requirements for the four rounds of selection described in step 2 are the same, as follows:

[0051] The mass concentration of the slurry each time is 5-10%;

[0052] The concentrate is collected by scraping bubbles at low liquid level;

[0053] The stirring speed is 1000~1200r / min, where:

[0054] Based on the amount of the graphite ore fine product, the amount of collector used in each of the selection steps I to III is 1 to 60 g / t, and the collector is diesel or kerosene;

[0055] Based on the amount of the finely crushed graphite ore product, the fusel alcohol foaming agent BK201 is used in the selection I, and its usage is 1-60g / t.

[0056] Furthermore, the process requirements for the seven rounds of selection in step 3 are the same, as follows:

[0057] Based on the amount of the graphite ore fine product, the amount of collector used in each of the selections V to X is 1 to 20 g / t;

[0058] The mass concentration of the ore pulp each time is 10-15%;

[0059] The stirring speed is 1300~1600r / min, where:

[0060] The collector is diesel or kerosene.

[0061] Furthermore, in the desliming operation after the roughing II operation, the yield of fine mud is 10 wt% to 20 wt%.

[0062] Furthermore, the process requirements for the sweeping and selection operation I in step 3 are as follows:

[0063] The stirring time is 2 to 5 minutes;

[0064] The flotation time is 5 to 10 minutes;

[0065] Based on the measurement of the graphite ore fine product, the scavenging operation in step 3 uses diesel or kerosene as a collector in an amount of 1 to 80 g / t;

[0066] Based on the amount of the finely crushed graphite ore product, the scavenging operation I in step 3 uses a fusel alcohol foaming agent BK201 in an amount of 1 to 30 g / t.

[0067] The beneficial effects of the graphite ore classification and separation process for protecting scales disclosed in the present invention are as follows:

[0068] 1. The target mineral graphite is divided into two separate cleaning chains for separate processing. The first cleaning chain (cleaning I to cleaning IV) mainly recovers large-scale graphite flakes, small-scale graphite flakes, and graphite in rich intergrowths, and removes mainly easily muddy gangue. The second cleaning chain (cleaning V to cleaning XI) mainly recovers graphite in medium intergrowths and poor intergrowths, and removes mainly hydrophilic gangue with high hardness and high wear resistance. The two cleaning chains achieve the classification and quality separation of graphite with different particle sizes and different floatability, improving the separation efficiency.

[0069] 2. Gangue is diverted, and easily argillized minerals are quickly removed through short-process low-concentration concentration and desludging operations. This alleviates the problem of low concentration efficiency caused by increased floatability due to over-grinding, which leads to serious entrainment. Targeted coarse grinding is used to enhance the dissociation effect of hydrophilic gangue with high hardness and wear resistance. Compared with full-size coarse grinding, this saves grinding energy. Most importantly, this type of gangue is separated from large-scale graphite monomers and rich intergrowths, reducing the occurrence of flake damage.

[0070] 3. The ore is graded according to the two feed particle sizes of fine crushing products and grinding products, and the quality is separated according to the difference in gangue types. While paying attention to the difference in floatability between graphite and gangue, attention is paid to the quality separation of different gangues, so as to achieve the classification and quality separation of graphite ore. Compared with the conventional process under existing technical conditions, the large flake rate of the concentrate is increased by nearly 10 percentage points, which increases the added value of the graphite concentrate product. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 This is a schematic diagram of a process flow for grading, quality classification and separation of graphite ore for protecting scales disclosed in Example 1 of the present invention.

[0072] Figure 2 This is a schematic diagram of the conventional process flow of a graphite ore dressing plant currently in production. DETAILED DESCRIPTION

[0073] The specific embodiments of the present invention are described in detail below.

[0074] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0075] Example 1

[0076] A graphite ore classification and separation process for protecting scales, comprising the following steps:

[0077] Step 1: The finely crushed graphite ore is fed into roughing I and roughing II in sequence as flotation ore, and the rough concentrates are combined to obtain rough concentrate 1;

[0078] Step 2: The coarse concentrate 1 obtained in step 1 is subjected to three alternating regrinding and four beneficiation steps to obtain concentrate 1. The three regrinding steps are all performed by a stirred mill. The three regrinding steps are regrinding I, regrinding II, and regrinding III, and the four beneficiation steps are beneficiation I, beneficiation II, beneficiation III, and beneficiation IV, wherein:

[0079] The tailings from the roughing II operation and the middlings from the cleaning I operation are combined into the desludging operation;

[0080] The ore from Concentrated II to Concentrated IV operations is merged and returned to Concentrated I;

[0081] Step 3: The deslimed product is coarsely ground in a ball mill and then enters roughing III to obtain a coarse concentrate 2. The coarse concentrate 2 is subjected to six re-grindings and seven cleanings in turn to obtain concentrate 2, wherein:

[0082] The six regrindings are regrinding IV, regrinding V, regrinding VI, regrinding VII, regrinding VIII and regrinding IX, wherein regrinding IV adopts a ball milling method, and regrinding V, regrinding VI, regrinding VII, regrinding VIII and regrinding IX adopt a stirred milling method;

[0083] The 7 selections are Selection V, Selection VI, Selection VII, Selection VIII, Selection IX, Selection X and Selection XI;

[0084] The tailings from the roughing III operation enter the scavenging I operation, and the tailings from the scavenging I operation are the final tailings;

[0085] The tailings from the Concentrator VI operation, the tailings from the Concentrator V operation, and the concentrate from the Scavenger I operation are combined and returned to the Rougher III operation;

[0086] The ores in the selection operations VII to XI are returned to the previous selection operation in sequence.

[0087] Furthermore, in terms of mass percentage, the particle size requirements of the finely crushed graphite ore product in step 1 are as follows:

[0088] -0.15mm content accounts for 20%; -3mm content accounts for 100%.

[0089] Furthermore, the process requirements for the roughing I operation in step 1 are as follows:

[0090] The stirring time is 2 minutes;

[0091] The flotation time was 5 minutes;

[0092] Based on the measurement of the graphite ore fine product, the roughing I operation in step 1 uses diesel as a collector at a dosage of 100 g / t;

[0093] Based on the measurement of the finely crushed graphite ore product, the roughing operation in step 1 uses a fusel alcohol foaming agent BK201 at a dosage of 32 g / t.

[0094] Furthermore, the process requirements for the roughing II operation in step 1 are as follows:

[0095] The stirring time is 2 minutes;

[0096] The flotation time was 5 minutes;

[0097] Based on the measurement of the graphite ore fine product, the roughing II operation in step 1 uses diesel as a collector at a dosage of 80 g / t;

[0098] Based on the measurement of the graphite ore fine product, the roughing II operation in step 1 uses a fusel alcohol foaming agent BK201 at a dosage of 32 g / t.

[0099] Furthermore, the process requirements for the roughing III operation in step 3 are as follows:

[0100] The stirring time is 2 minutes;

[0101] The flotation time was 5 minutes;

[0102] Based on the measurement of the graphite ore fine product, the roughing III operation in step 3 uses diesel as a collector at a dosage of 100 g / t;

[0103] Based on the measurement of the graphite ore fine product, the roughing III operation in step 3 uses the fusel alcohol foaming agent BK201 at a dosage of 32 g / t.

[0104] Furthermore, the process requirements for the four rounds of selection described in step 2 are the same, as follows:

[0105] The mass concentration of the slurry after each selection is 8%;

[0106] The concentrate is collected by scraping bubbles at low liquid level;

[0107] The stirring speed is 1100r / min, where:

[0108] Based on the measurement of the graphite ore fine product, the amount of collector used in the selection I is 30g / t, and the collector is diesel;

[0109] The collector dosage of Selected II to Selected III is 20g / t, and the collector is diesel;

[0110] Based on the amount of the finely crushed graphite ore product, the fusel alcohol foaming agent BK201 is used in the selection I, and its dosage is 30g / t.

[0111] Furthermore, the process requirements for the seven rounds of selection in step 3 are the same, as follows:

[0112] Based on the amount of the graphite ore fine product, the amount of collector used in each of the selections V to X is 20 g / t;

[0113] The mass concentration of the slurry after each selection is 12%;

[0114] The stirring speed is 1500r / min, where:

[0115] The collector is diesel.

[0116] Furthermore, in the desliming operation after the roughing II operation, the yield of fine mud was 14.5 wt%.

[0117] Furthermore, the process requirements for the sweeping and selection operation I in step 3 are as follows:

[0118] The stirring time is 2 minutes;

[0119] The flotation time was 5 minutes;

[0120] Based on the measurement of the graphite ore fine product, the scavenging operation in step 3 uses diesel as a collector at a dosage of 50 g / t;

[0121] Based on the measurement of the graphite ore fine product, the scavenging operation I in step 3 uses a fusel alcohol foaming agent BK201 at a dosage of 16 g / t.

[0122] Example 2

[0123] A graphite ore classification and separation process for protecting scales, comprising the following steps:

[0124] Step 1: The finely crushed graphite ore is fed into roughing I and roughing II in sequence as flotation ore, and the rough concentrates are combined to obtain rough concentrate 1;

[0125] Step 2: The coarse concentrate 1 obtained in step 1 is subjected to three alternating regrinding and four beneficiation steps to obtain concentrate 1. The three regrinding steps are all performed by a stirred mill. The three regrinding steps are regrinding I, regrinding II, and regrinding III, and the four beneficiation steps are beneficiation I, beneficiation II, beneficiation III, and beneficiation IV, wherein:

[0126] The tailings from the roughing II operation and the middlings from the cleaning I operation are combined into the desludging operation;

[0127] The ore from Concentrated II to Concentrated IV operations is merged and returned to Concentrated I;

[0128] Step 3: The deslimed product is coarsely ground in a ball mill and then enters roughing III to obtain a coarse concentrate 2. The coarse concentrate 2 is subjected to six re-grindings and seven cleanings in turn to obtain concentrate 2, wherein:

[0129] The six regrindings are regrinding IV, regrinding V, regrinding VI, regrinding VII, regrinding VIII and regrinding IX, wherein regrinding IV adopts a ball milling method, and regrinding V, regrinding VI, regrinding VII, regrinding VIII and regrinding IX adopt a stirred milling method;

[0130] The 7 selections are Selection V, Selection VI, Selection VII, Selection VIII, Selection IX, Selection X and Selection XI;

[0131] The tailings from the roughing III operation enter the scavenging I operation, and the tailings from the scavenging I operation are the final tailings;

[0132] The tailings from the Concentrator VI operation, the tailings from the Concentrator V operation, and the concentrate from the Scavenger I operation are combined and returned to the Rougher III operation;

[0133] The ore from Concentrated VII Operation to Concentrated XI Operation is concentrated and returned to Concentrated VI.

[0134] Furthermore, in terms of mass percentage, the particle size requirements of the finely crushed graphite ore product in step 1 are as follows:

[0135] -0.15mm content accounts for 20%; -3mm content accounts for 100%.

[0136] Furthermore, the process requirements for the roughing I operation in step 1 are as follows:

[0137] The stirring time is 3 minutes;

[0138] The flotation time was 8 minutes;

[0139] Based on the measurement of the graphite ore fine product, the roughing I operation in step 1 uses kerosene as a collector at a dosage of 1 g / t;

[0140] Based on the measurement of the graphite ore fine product, the roughing I operation in step 1 uses a fusel alcohol foaming agent BK201 at a dosage of 1 g / t.

[0141] Furthermore, the process requirements for the roughing II operation in step 1 are as follows:

[0142] The stirring time is 3 minutes;

[0143] The flotation time was 8 minutes;

[0144] Based on the measurement of the graphite ore fine product, the roughing II operation in step 1 uses kerosene as a collector at a dosage of 1 g / t;

[0145] Based on the measurement of the finely crushed graphite ore product, the roughing II operation in step 1 uses a fusel alcohol foaming agent BK201 at a dosage of 1 g / t.

[0146] Furthermore, the process requirements for the roughing III operation in step 3 are as follows:

[0147] The stirring time is 3 minutes;

[0148] The flotation time was 8 minutes;

[0149] Based on the measurement of the graphite ore fine product, the roughing III operation in step 3 uses kerosene as a collector at a dosage of 1 g / t;

[0150] Based on the measurement of the graphite ore fine product, the roughing III operation in step 3 uses a fusel alcohol foaming agent BK201 at a dosage of 1 g / t.

[0151] Furthermore, the process requirements for the four rounds of selection described in step 2 are the same, as follows:

[0152] The mass concentration of the slurry after each selection is 5%;

[0153] The concentrate is collected by scraping bubbles at low liquid level;

[0154] The stirring speed is 1000r / min, where:

[0155] Based on the amount of the graphite ore fine product, the amount of collector used in each of the selections I to III is 1 g / t, and the collector is kerosene;

[0156] Based on the amount of the finely crushed graphite ore product, the fusel alcohol foaming agent BK201 is used in the selection I, and its dosage is 1g / t.

[0157] Furthermore, the process requirements for the seven rounds of selection in step 3 are the same, as follows:

[0158] Based on the amount of the graphite ore fine product, the amount of collector used in each of the selections V to X is 1 g / t;

[0159] The mass concentration of the slurry after each selection is 10%;

[0160] The stirring speed is 1300r / min, where:

[0161] The collector is kerosene.

[0162] Furthermore, in the desliming operation after the roughing II operation, the yield of fine mud was 10 wt%.

[0163] Furthermore, the process requirements for the sweeping and selection operation I in step 3 are as follows:

[0164] The stirring time is 3 minutes;

[0165] The flotation time was 8 minutes;

[0166] Based on the measurement of the graphite ore fine product, the scavenging operation in step 3 uses kerosene as a collector at a dosage of 1 g / t;

[0167] Based on the measurement of the finely crushed graphite ore product, the scavenging operation I in step 3 uses a fusel alcohol foaming agent BK201 at a dosage of 1 g / t.

[0168] Example 3

[0169] A graphite ore classification and separation process for protecting scales, comprising the following steps:

[0170] Step 1: The finely crushed graphite ore is fed into roughing I and roughing II in sequence as flotation ore, and the rough concentrates are combined to obtain rough concentrate 1;

[0171] Step 2: The coarse concentrate 1 obtained in step 1 is subjected to three alternating regrinding and four beneficiation steps to obtain concentrate 1. The three regrinding steps are all performed by a stirred mill. The three regrinding steps are regrinding I, regrinding II, and regrinding III, and the four beneficiation steps are beneficiation I, beneficiation II, beneficiation III, and beneficiation IV, wherein:

[0172] The tailings from the roughing II operation and the middlings from the cleaning I operation are combined into the desludging operation;

[0173] The ore from Concentrated II to Concentrated IV operations is merged and returned to Concentrated I;

[0174] Step 3: The deslimed product is coarsely ground in a ball mill and then enters roughing III to obtain a coarse concentrate 2. The coarse concentrate 2 is subjected to six re-grindings and seven cleanings in turn to obtain concentrate 2, wherein:

[0175] The six regrindings are regrinding IV, regrinding V, regrinding VI, regrinding VII, regrinding VIII and regrinding IX, wherein regrinding IV adopts a ball milling method, and regrinding V, regrinding VI, regrinding VII, regrinding VIII and regrinding IX adopt a stirred milling method;

[0176] The 7 selections are Selection V, Selection VI, Selection VII, Selection VIII, Selection IX, Selection X and Selection XI;

[0177] The tailings from the roughing III operation enter the scavenging I operation, and the tailings from the scavenging I operation are the final tailings;

[0178] The tailings from the Concentrator VI operation, the tailings from the Concentrator V operation, and the concentrate from the Scavenger I operation are combined and returned to the Rougher III operation;

[0179] The ores in the selection operations VII to XI are returned to the previous selection operation in sequence.

[0180] Furthermore, in terms of mass percentage, the particle size requirements of the finely crushed graphite ore product in step 1 are as follows:

[0181] -0.15mm content accounts for 42%; -3mm content accounts for 100%.

[0182] Furthermore, the process requirements for the roughing I operation in step 1 are as follows:

[0183] The stirring time is 5 minutes;

[0184] The flotation time was 10 minutes;

[0185] Based on the measurement of the graphite ore fine product, the roughing I operation in step 1 uses kerosene as a collector at a dosage of 150 g / t;

[0186] Based on the measurement of the finely crushed graphite ore product, the roughing operation in step 1 uses a fusel alcohol foaming agent BK201 at a dosage of 50 g / t.

[0187] Furthermore, the process requirements for the roughing II operation in step 1 are as follows:

[0188] The stirring time is 5 minutes;

[0189] The flotation time was 10 minutes;

[0190] Based on the measurement of the graphite ore fine product, the roughing II operation in step 1 uses kerosene as a collector at a dosage of 120 g / t;

[0191] Based on the measurement of the finely crushed graphite ore product, the roughing II operation in step 1 uses a fusel alcohol foaming agent BK201 at a dosage of 50 g / t.

[0192] Furthermore, the process requirements for the roughing III operation in step 3 are as follows:

[0193] The stirring time is 5 minutes;

[0194] The flotation time was 10 minutes;

[0195] Based on the measurement of the graphite ore fine product, the roughing III operation in step 3 uses kerosene as a collector at a dosage of 150 g / t;

[0196] Based on the measurement of the finely crushed graphite ore product, the roughing III operation in step 3 uses a fusel alcohol foaming agent BK201 at a dosage of 50 g / t.

[0197] Furthermore, the process requirements for the four rounds of selection described in step 2 are the same, as follows:

[0198] The mass concentration of the slurry after each selection is 10%;

[0199] The concentrate is collected by scraping bubbles at low liquid level;

[0200] The stirring speed is 1200r / min, where:

[0201] Based on the amount of the graphite ore fine product, the amount of collector used in each of the selections I to III is 60 g / t, and the collector is kerosene;

[0202] Based on the amount of the finely crushed graphite ore product, the fusel alcohol foaming agent BK201 is used in the selection I, and its usage is 60g / t.

[0203] Furthermore, the process requirements for the seven rounds of selection in step 3 are the same, as follows:

[0204] Based on the amount of the graphite ore fine product, the amount of collector used in each of the selections V to X is 15 g / t;

[0205] The mass concentration of the slurry after each selection is 15%;

[0206] The stirring speed is 1600r / min, where:

[0207] The collector is kerosene.

[0208] Furthermore, in the desliming operation after the roughing II operation, the yield of fine mud was 20 wt%.

[0209] Furthermore, the process requirements for the sweeping and selection operation I in step 3 are as follows:

[0210] The stirring time is 5 minutes;

[0211] The flotation time was 10 minutes;

[0212] Based on the measurement of the graphite ore fine product, the scavenging operation in step 3 uses kerosene as a collector at a dosage of 80 g / t;

[0213] Based on the measurement of the finely crushed graphite ore product, the scavenging operation I in step 3 uses a fusel alcohol foaming agent BK201 at a dosage of 30 g / t.

[0214] Parallel comparative test:

[0215] A graphite mine in Luobei, Heilongjiang Province was used for separation test research. The original ore was crushed to -3mm and then divided into two parts as feed for parallel comparison test.

[0216] Take one of them, and the test process is as follows Figure 1 As shown, Figure 1 This is a schematic diagram of a process flow for grading, quality classification and separation of graphite ore for protecting scales disclosed in Example 1 of the present invention.

[0217] Take another part of it, and the test process is as follows Figure 2As shown, Figure 2 The following is a schematic diagram of the conventional process flow of a currently operating graphite ore dressing plant. The two plants conducted separation tests under their respective optimal conditions and compared the test indicators. The relevant results are shown in Table 1:

[0218] Table 1 Comparison of test results

[0219]

[0220]

[0221] As shown in the test results in Table 1, by adopting the process flow proposed in the present invention, under optimal conditions, the fixed carbon grade and fixed carbon recovery rate of the concentrate equivalent to those of the process flow under the existing technical conditions can be achieved, and the large flake rate (+0.15mm) is increased by a total of 9 percentage points, indicating that the process flow proposed in the present invention has great advantages in protecting graphite flakes (currently from the perspective of industrial practice, it is very difficult to increase the large flake rate by 2 percentage points).

[0222] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments, and various modifications can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A graphite ore classification and quality separation process for protecting scales, characterized in that: Here are the steps: Step 1: The finely crushed graphite ore is fed into roughing I and roughing II in sequence as flotation ore, and the rough concentrates are combined to obtain rough concentrate 1; Step 2: The coarse concentrate 1 obtained in step 1 is subjected to regrinding I, concentrating I, regrinding II, concentrating II, regrinding III, concentrating III and concentrating IV in sequence to obtain concentrate 1, wherein: Said regrinding I, said regrinding II and said regrinding III all adopt the method of stirred mill; The tailings from the roughing II operation and the middlings from the cleaning I operation are combined into the desludging operation; The ore from Concentrated II to Concentrated IV operations is merged and returned to Concentrated I; Step 3: The deslimed product is coarsely ground in a ball mill and then enters roughing III to obtain a coarse concentrate 2. The coarse concentrate 2 is sequentially subjected to regrinding IV, concentrating V, regrinding V, concentrating VI, regrinding VI, concentrating VII, regrinding VII, concentrating VIII, regrinding VIII, concentrating IX, regrinding IX, concentrating X and concentrating XI to obtain concentrate 2, wherein: The regrinding IV adopts the ball milling method, and the regrinding V, the regrinding VI, the regrinding VII, the regrinding VIII and the regrinding IX all adopt the stirred milling method; The tailings from the roughing III operation enter the scavenging I operation, and the tailings from the scavenging I operation are the final tailings; The tailings from the Concentrator VI operation, the tailings from the Concentrator V operation, and the concentrate from the Scavenger I operation are combined and returned to the Rougher III operation; The ores in the selection operations VII to XI are returned to the previous selection operation in sequence or returned to selection VI in a concentrated manner.

2. The graphite ore classification and separation process for protecting scales according to claim 1, characterized in that: In terms of mass percentage, the particle size requirements of the finely crushed graphite ore product in step 1 are as follows: -0.15mm content is at least 20%; -3mm content is 100%.

3. The graphite ore classification and separation process for protecting scales according to claim 1, characterized in that: The process requirements for the roughing I operation in step 1 are as follows: The stirring time is 2 to 5 minutes; The flotation time is 5 to 10 minutes; Based on the measurement of the graphite ore fine product, the roughing operation of step 1 uses diesel or kerosene as a collector in an amount of 1 to 150 g / t; Based on the amount of the finely crushed graphite ore product, the roughing operation in step 1 uses a fusel alcohol foaming agent BK201 in an amount of 1 to 50 g / t.

4. The graphite ore classification and quality separation process for protecting scales according to claim 1, characterized in that: The process requirements for the roughing II operation in step 1 are as follows: The stirring time is 2 to 5 minutes; The flotation time is 5 to 10 minutes; Based on the measurement of the graphite ore fine product, the roughing II operation in step 1 uses diesel or kerosene as a collector in an amount of 1 to 120 g / t; Based on the amount of the finely crushed graphite ore product, the roughing II operation in step 1 uses a fusel alcohol foaming agent BK201 in an amount of 1 to 50 g / t.

5. The graphite ore classification and quality separation process for protecting scales according to claim 1, characterized in that: The process requirements for the roughing III operation described in step 3 are as follows: The stirring time is 2 to 5 minutes; The flotation time is 5 to 10 minutes; Based on the measurement of the graphite ore fine product, the roughing III operation in step 3 uses diesel or kerosene as a collector in an amount of 1 to 150 g / t; Based on the amount of the finely crushed graphite ore product, the roughing III operation in step 3 uses a fusel alcohol foaming agent BK201 in an amount of 1 to 50 g / t.

6. The graphite ore classification and quality separation process for protecting scales according to claim 1, characterized in that: The process requirements for the four rounds of selection described in step 2 are the same, as follows: The mass concentration of the slurry each time is 5-10%; The concentrate is collected by scraping and bubbling at low liquid level; The stirring speed is 1000~1200r / min, where: Based on the amount of the graphite ore fine product, the amount of collector used in each of the selection steps I to III is 1 to 60 g / t, and the collector is diesel or kerosene; Based on the amount of the finely crushed graphite ore product, the fusel alcohol foaming agent BK201 is used in the selection I, and its usage is 1-60g / t.

7. The graphite ore classification and separation process for protecting scales according to claim 1, characterized in that: The process requirements for the 7 rounds of selection described in step 3 are the same, as follows: Based on the amount of the graphite ore fine product, the amount of collector used in each of the selections V to X is 1 to 20 g / t; The mass concentration of the ore pulp each time is 10-15%; The stirring speed is 1300~1600r / min, where: The collector is diesel or kerosene.

8. The graphite ore classification and separation process for protecting scales according to claim 1, characterized in that: In the desliming operation after the roughing II operation, the yield of fine mud is 10wt% to 20wt%.

9. The graphite ore classification and separation process for protecting scales according to claim 1, characterized in that: The process requirements for the sweeping and selection operation in step 3 are as follows: The stirring time is 2 to 5 minutes; The flotation time is 5 to 10 minutes; Based on the measurement of the graphite ore fine product, the scavenging operation in step 3 uses diesel or kerosene as a collector in an amount of 1 to 80 g / t; Based on the amount of the finely crushed graphite ore product, the scavenging operation I in step 3 uses a fusel alcohol foaming agent BK201 in an amount of 1 to 30 g / t.

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