A method for pre-enrichment of chrysoberyl-type beryllium ore

Abstract

The present invention proposes a beneficiation pre-enrichment method for chrysoberyl-type beryllium ore. The method of the present invention first removes most carbonate minerals such as calcite and dolomite and gangue minerals such as chlorite and mica through floatation and sinking separation, and then adopts a stage grinding and stage separation process to obtain pre-selected beryllium concentrate. The process is simplified, the grinding feed amount is reduced, the selection grade is improved, and the carbonate minerals that interfere with flotation are reduced. In addition, fluorine-free reagents are used in the separation process to reduce the impact on the flotation environment. At the same time, a higher beryllium concentrate grade and recovery rate are ensured. In addition, the entire beneficiation process reduces the costs of grinding, reagents, equipment loss, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, in particular to a mineral processing pre-enrichment method for chrysoberyl-type beryllium ore. Background Art

[0002] Beryllium is known as "metallic glass". Its alloy is an irreplaceable strategic metal material in the fields of aviation, aerospace, military, electronics, nuclear energy, etc. It is one of the guarantee resources and strategic resources for the development of my country's high-tech industries. There are about 50 kinds of beryllium minerals in nature. The main beryllium minerals with industrial value are: beryl (emerald (Be3Al2[Si6O 18 ], with a theoretical BeO content of 14.1%), beryllium silicate (spar-like Be2[SiO4], with a theoretical BeO content of 43.82%), hydroxyberyllium silicate (Be4Si2O9H, with a theoretical BeO content of 39.6-42.77%), heliotrope (Mn4[BeSiO4]3S, with a theoretical BeO content of 12.5-13.6%), and chrysoberyl (beryllium spinel BeAl2O4, with a theoretical BeO content of 19.8%).

[0003] A beryllium ore in Hunan Province primarily contains chrysoberyl (beryllium spinel) (1-3%), rich in fluorite (20-45%), and a small amount of heliotropes. The main gangue minerals are calcite (15-30%), dolomite (5-25%), diopside (5-15%), chlorite (1-3%), and mica (3-10%). This beryllium ore boasts significant reserves and is a unique resource, making it an important reserve for beryllium. However, due to the fine grain size of the chrysoberyl-type beryllium ore, the separation of individual elements is difficult, separation is challenging, and the metallurgical costs are high, preventing its current industrial application. According to literature, most research institutions and related research organizations use a combination of metallurgical processes for the recovery of this type of beryllium ore, while some also employ metallurgical processes such as direct ore roasting, leaching, and extraction.

[0004] Literature - Research on the Extraction Process of Beryllium from Chrysoberyl-Type Beryllium Ore (Master's Thesis, Xiangtan University, 2017.6), targeting the chrysoberyl-type beryllium ore in the Xianghualing mining area of Chenzhou, Hunan, a "reverse flotation-roasting-acid leaching-extraction new process" was adopted. The BeO content of the original ore was 0.261%, and reverse flotation was used to enrich it to 0.400% beryllium crude concentrate, with a beryllium recovery rate of 75.0%. The crude beryllium concentrate was leached, and the operating leaching rate of beryllium could reach 82.0%, and the total leaching rate was over 60.0%. After pretreatment, the leachate was subjected to extraction and back-extraction tests, and the primary extraction rate of beryllium was over 80.0%, and the back-extraction rate was over 95.0%.

[0005] Patented method for extracting beryllium oxide from chrysoberyl beryllium ore, application number: 201610054060.0. Targeting chrysoberyl beryllium ore, the gangue minerals are 35-55% dolomite, 20-33% fluorite, and 20-30% chlorite. First, the ore is ground to -200 mesh, accounting for 98%, and then 7-12kg / t water glass and 0.5-1.2kg / t fatty acid collector are added to perform dolomite reverse flotation. After the dolomite tailings are densely dehydrated, 0.5-2.5kg / t aluminum sulfate and 1.4-5.5kg / t sodium fluorosilicate, 0.4-1.4kg / t tall oil, and 0.2-0.7kg / t fatty acid are added to float the chrysoberyl and some fluorite, obtaining a slag containing 1.2-1.5% BeO and 1.2-1.5% CaF2. 28-30% beryllium crude concentrate; then pelletizing, roasting, acid leaching and extracting the beryllium crude concentrate to obtain Be(OH)2 precipitate, then solid-liquid separation, and calcining the precipitate at 1000°C to obtain beryllium oxide.

[0006] The patent discloses a method for extracting beryllium from chrysoberyl-type beryllium concentrate with a low beneficiation enrichment ratio. The patent application number is 201610371862.0. For chrysoberyl-type beryllium concentrate with a high beneficiation enrichment ratio, the patent adopts a pretreatment, acid roasting, water leaching, impurity removal, extraction, and recovery process to obtain beryllium fluoride and beryllium oxide products with a content of more than 97% and a beryllium recovery rate of more than 73%. This solves the problem that the impurity content in the leachate of direct acid leaching of chrysoberyl-type beryllium ore is high, which is not conducive to the subsequent beryllium recovery.

[0007] Chrysoberyl-type beryllium ore is usually closely associated with fluorite, calcite, dolomite, mica, chlorite, etc., making it difficult to dissociate. Moreover, it is rich in carbonate and fluorite, especially high-carbonate fluorite-containing beryllium ore, which is more difficult to beneficiate. It is difficult to enrich beryllium oxide (beryl) to meet the industrial requirements through beneficiation methods. The current processes used to recover beryllium from chrysoberyl-type beryllium ore are: (1) direct extraction of beryllium from the ore - roasting - leaching - extraction; (2) after fine grinding of the ore (-200 mesh greater than 90%), adding fluorine-containing reagents to enrich by flotation 3-4 times to beryllium concentrate (containing BeO ≥ 1%), and then roasting - leaching - extraction to extract beryllium; (3) after fine grinding of the ore without adding fluorine-containing reagents, reverse flotation is used to enrich beryllium; the enrichment of process 3 is relatively low, only more than 2 times. All three existing beneficiation processes require direct fine grinding of the raw ore. While fine grinding improves beryllium concentrate grade and recovery, it also increases production costs. Another method for increasing beryllium concentration is the addition of fluorine-containing reagents, which is environmentally unfriendly. Summary of the Invention

[0008] The present invention provides a beneficiation pre-enrichment method for chrysoberyl-type beryllium ore. The method first removes most carbonate minerals such as calcite and dolomite and gangue minerals such as chlorite and mica through floatation and sinking separation, and then adopts a stage grinding and stage separation process to obtain pre-selected beryllium concentrate. The process is simplified, the grinding feed amount is reduced, the selection grade is improved, and the carbonate minerals that interfere with flotation are reduced. In addition, fluorine-free reagents are used in the separation process to reduce the impact on the flotation environment. At the same time, a higher beryllium concentrate grade and recovery rate are ensured. In addition, the entire beneficiation process reduces the costs of grinding, reagents, equipment loss, etc.

[0009] The technical solution of the present invention is achieved as follows: A method for pre-enrichment of chrysoberyl-type beryllium ore, comprising the following steps:

[0010] (1) Floating and sinking separation: The chrysoberyl-type beryllium ore is first crushed to a particle size of less than 15 mm, and then sieved to obtain 15 mm-0.5 mm material and -0.5 mm material; the 15 mm-0.5 mm material is sorted by floating and sinking, and the sorting density is 2.8-2.9 g / cm 3 , obtain heavy and light minerals;

[0011] (2) Sulfide ore flotation: The heavy minerals from step (1) are crushed, combined with the -0.5 mm material, and ground to -0.074 mm, accounting for 70%-80%. A roughing separation and a scavenging separation are performed to obtain sulfide ore flotation foam 1 and tank bottom material 1;

[0012] (3) Floating fluorite: The bottom material 1 of step (2) is subjected to a roughing selection to obtain a roughing foam 2 and a bottom material 2, and the bottom material 2 is subjected to a scavenging selection to obtain a scavenging foam 3 and a bottom material 3;

[0013] (4) reverse flotation of gangue: the bottom material 3 of step (3) is subjected to multiple reverse flotation of gangue to obtain bottom material 4, and the foams of multiple reverse flotation of gangue are combined into reverse flotation foam 4;

[0014] (5) Regrinding and selection: The roughing foam 2 and the scavenging foam 3 are combined and sent to regrinding. The regrinding fineness is -0.074mm, accounting for 95%-98%. After regrinding, a selection is carried out to obtain fluorite coarse concentrate 5 and bottom material 5. The bottom material 5 is subjected to two fine scavengings to obtain fine scavenging foam 6 and bottom material 6. The bottom material 6 and the bottom material 4 are combined to obtain beryllium pre-enrichment concentrate. The sulfide ore flotation foam 1, the reverse flotation foam 4 and the fine scavenging foam 6 are combined to form flotation tailings.

[0015] Furthermore, in step (2), in a rough selection, the following are added: 300-500 g / t of water glass, 50-80 g / t of Y89 xanthate, 30-50 g / t of butyl ammonium black powder and 10-20 g / t of ethyl thiocyanate; in a sweep selection, the following are added: 20-40 g / t of Y89 xanthate, 10-20 g / t of butyl ammonium black powder and 2-5 g / t of ethyl thiocyanate.

[0016] Furthermore, in step (3), in a rough selection, 300-500 g / t of sodium hydroxide, 500-1000 g / t of sodium carbonate and 1000-2500 g / t of water glass are first added, and after stirring, 100-300 g / t of oxidized paraffin soap and 100-300 g / t of sodium oleate as collectors are added; and 300-500 g / t of water glass, 50-100 g / t of oxidized paraffin soap and 50-100 g / t of sodium oleate are added in a sweep selection.

[0017] Furthermore, in step (4), the bottom material 3 is subjected to three gangue reverse flotation, wherein 10-100 g / t of dodecylamine hydrochloride and 0-60 g / t of No. 2 oil are added to the first gangue reverse flotation; 300-1000 g / t of water glass, 30-70 g / t of oxidized paraffin soap and 30-50 g / t of sodium oleate are added to the second gangue reverse flotation; and 100-500 g / t of water glass, 10-50 g / t of oxidized paraffin soap and 10-30 g / t of sodium oleate are added to the third gangue reverse flotation.

[0018] Furthermore, in step (5), 300-500 g / t of acidic water glass and 100-300 g / t of tannic acid or sodium humate are added during the primary concentration.

[0019] Furthermore, in step (5), the two fine sweeping and selections include fine sweeping and selection one and fine sweeping and selection two, and in the fine sweeping and selection one, 100-200 g / t of acidic water glass, 50-100 g / t of tannic acid or sodium humate, 20-70 g / t of sodium hexametaphosphate, 20-70 g / t of oxidized paraffin soap and 20-50 g / t of sodium oleate are added; in the fine sweeping and selection two, 50-100 g / t of acidic water glass, 10-50 g / t of sodium hexametaphosphate, 10-30 g / t of oxidized paraffin soap and 10-30 g / t of sodium oleate are added.

[0020] The acidic water glass of the present invention is prepared by mixing 10 wt % water glass solution and 10 wt % sulfuric acid solution in a volume ratio of 1:1.

[0021] Beneficial effects of the present invention:

[0022] The present invention aims to pre-enrich beryllium from chrysoberyl-type beryllium ore, adopting a process flow of first removing gangue minerals such as carbonate, chlorite, and mica after crushing the raw ore, and then performing a staged grinding and separation process to obtain a pre-enriched beryllium concentrate. The advantages of the present invention are:

[0023] (1) The float-sink separation process can remove 20-35% of carbonate minerals and gangue minerals (light minerals), thereby improving the grade of the ore and reducing the grinding cost. It can also reduce the feed volume of subsequent high-cost operations such as grinding and flotation, and increase the processing capacity of the ore dressing plant.

[0024] (2) Most of the light minerals separated by floatation and sinking separation are carbonate minerals, which reduces the impact of carbonate minerals on the flotation process, resulting in a good flotation environment and reducing the amount of flotation reagents used;

[0025] (3) Stage grinding and flotation process: First, the appropriate grinding fineness is selected in the first stage of grinding to provide a favorable separation environment for flotation separation of sulfide ore and fluorite, which can float out sulfide ore to the greatest extent, and then float out fluorite and fluorite and beryllium mineral associations. The flotation tailings contain beryllium minerals, mica, chlorite, some carbonates and other minerals. The flotation tailings are then removed by flotation to remove mica and some carbonates, chlorite, etc. to obtain beryllium concentrate. The flotation foam is re-grinded to reduce the amount of re-grinding. After re-grinding, acidic water glass and tannin or sodium humate are added to separate beryllium-containing minerals and fluorite. The entire flotation process uses conventional fluorine-free reagents, which are widely available and have little change in reagent performance, which is beneficial to the stability of the mineral processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a process flow chart of a method for pre-enrichment of chrysoberyl-type beryllium ore according to the present invention;

[0028] Figure 2 This is the process flow chart of Comparative Example 1. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, a method for pre-enrichment of chrysoberyl-type beryllium ore comprises the following steps:

[0031] (1) Floating and sinking test: The chrysoberyl-type beryllium ore was first crushed to a particle size of less than 15 mm, and then sieved to obtain 15 mm-0.5 mm material and -0.5 mm material; the 15 mm-0.5 mm material was separated by floating and sinking, and the density of the material was selected to be 2.8-2.9 g / cm according to the density difference between gangue minerals, fluorite and chrysoberyl. 3 , obtain heavy and light minerals;

[0032] (2) Sulfide ore flotation: crush the heavy minerals from the sink-float test, combine them with the -0.5mm material screened from the original ore, grind them to -0.074mm, accounting for 70%-80%, and perform one roughing and one scavenging to obtain sulfide ore flotation foam 1 and tank bottom material 1. In the roughing, add 300-500g / t of water glass, 50-80g / t of Y89 xanthate, 30-50g / t of butylammonium black powder and 10-20g / t of ethyl thiocyanate. In the scavenging, add 20-40g / t of Y89 xanthate, 10-20g / t of butylammonium black powder and 2-5g / t of ethyl thiocyanate.

[0033] (3) Floating fluorite: 300-500 g / t of sodium hydroxide, 500-1000 g / t of sodium carbonate and 1000-2500 g / t of water glass were added to the bottom material 11 of step (2), and the mixture was stirred for 10 minutes. Then, 100-300 g / t of oxidized paraffin soap 731 and 100-300 g / t of sodium oleate were added as collectors, and the mixture was stirred for 5 minutes. A roughing process was performed to obtain a roughing foam 2 and bottom material 2. 300-500 g / t of water glass, 50-100 g / t of oxidized paraffin soap 731 and 50-100 g / t of sodium oleate were added to the bottom material 2, and a scavenging process was performed to obtain a scavenging foam 3 and bottom material 3.

[0034] (4) reverse flotation of gangue: the bottom material 3 of step (3) is subjected to three gangue reverse flotation to obtain bottom material 4, and the foams of the three gangue reverse flotation are combined into reverse flotation foam 4, and the three gangue reverse flotation include gangue reverse flotation 1, gangue reverse flotation 2 and gangue reverse flotation 3, in which 10-100 g / t of dodecylamine hydrochloride and 0-60 g / t of No. 2 oil are added to the gangue reverse flotation 1; 300-1000 g / t of water glass, 30-70 g / t of oxidized paraffin soap 731 and 30-50 g / t of sodium oleate are added to the gangue reverse flotation 2; and 100-500 g / t of water glass, 10-50 g / t of oxidized paraffin soap 731 and 10-30 g / t of sodium oleate are added to the gangue reverse flotation 3;

[0035] (5) Regrinding and selection: The roughing foam 2 and the scavenging foam 3 are combined and sent to regrinding. The regrinding fineness is -0.074mm, accounting for 95%-98%. After regrinding, a first selection is performed to obtain fluorite coarse concentrate 5 and bottom material 5. Acidic water glass 300-500g / t and tannic acid or sodium humate 100-300g / t are added in the first selection; the bottom plastic 5 is subjected to two fine scavengings to obtain fine scavenging foam 6 and bottom material 6. The two fine scavengings include Fine sweeping and selection one and fine sweeping and selection two, add acidic water glass 100-200g / t, tannic acid or sodium humate 50-100g / t, sodium hexametaphosphate 20-70g / t, oxidized paraffin soap 20-70g / t and sodium oleate 20-50g / t in fine sweeping and selection one; add acidic water glass 50-100g / t, sodium hexametaphosphate 10-50g / t, oxidized paraffin soap 10-30g / t and sodium oleate 10-30g / in fine sweeping and selection two.

[0036] The bottom material 6 and the bottom material 4 are combined to form the beryllium pre-enriched concentrate, and the sulfide ore flotation foam 1, the reverse flotation foam 4 and the fine scavenging foam 6 are combined to form the flotation tailings.

[0037] The specific embodiments are as follows:

[0038] Example 1

[0039] A chrysoberyl-type beryllium mine in Chenzhou, Hunan Province, has the following main useful minerals: chrysoberyl 1-2%, fluorite 30%-45%, and main gangue minerals: calcite 20-25%, dolomite 10-15%, mica 3-5%, chlorite 3-5%, etc. The raw ore is first crushed to less than 15mm, and then sieved to 0.5mm to obtain 15mm-0.5mm material and -0.5mm material, with yields of 93% and 7% respectively. The 15mm-0.5mm material is sieved to a density of 2.8g / cm 3 The heavy minerals and light minerals are obtained by floating and sinking separation in the medium.

[0040] The heavy minerals separated by floating and sinking are crushed to a suitable particle size for grinding, and then combined with the -0.5mm material screened from the original ore and ground to -0.074mm, accounting for 70%-75%. The sulfide ore is flotated by a roughing selection and a scavenging selection to obtain sulfide ore foam 1 and bottom material 1. 300g / t of water glass, 70g / t of Y89 xanthate, 40g / t of butyl ammonium black powder and 10g / t of ethyl thiocyanate are added in the roughing selection, and 30g / t of Y89 xanthate, 15g / t of butyl ammonium black powder and 5g / t of ethyl thiocyanate are added in the scavenging selection.

[0041] 300 g / t of sodium hydroxide, 800 g / t of sodium carbonate and 2500 g / t of water glass were added to the bottom material 1, and the mixture was stirred for 10 minutes. Then, 200 g / t of oxidized paraffin soap 731 and 200 g / t of sodium oleate were added, and the mixture was stirred for 5 minutes. A roughing process was performed to obtain a roughing foam 2 and bottom material 2. 500 g / t of water glass, 500 g / t of oxidized paraffin soap 731 and 50 g / t of sodium oleate were added to the bottom material 2, and a scavenging process was performed to obtain a scavenging foam 3 and bottom material 3.

[0042] The roughing foam 2 and the scavenging foam 3 are combined and sent to regrinding. The regrinding fineness is -0.074mm, accounting for 95%. After regrinding, a primary cleaning is performed to obtain fluorite coarse concentrate 5 and bottom material 5. Acidic water glass 500g / t and tannic acid 180g / t are added during the primary cleaning.

[0043] The bottom material 5 is subjected to two fine scavenging processes to obtain fine scavenging foam 6 and bottom material 6. The two fine scavenging processes include fine scavenging one and fine scavenging two. In the fine scavenging one, 100 g / t of acidic water glass, 80 g / t of tannic acid, 40 g / t of sodium hexametaphosphate, 50 g / t of oxidized paraffin soap and 50 g / t of sodium oleate are added; in the fine scavenging two, 50 g / t of acidic water glass, 20 g / t of sodium hexametaphosphate, 20 g / t of oxidized paraffin soap and 20 g / t of sodium oleate are added.

[0044] The bottom material 6 and the bottom material 4 are combined to form beryllium pre-enriched concentrate (abbreviated as beryllium concentrate), and the sulfide ore flotation foam 1, the reverse flotation foam 4 and the fine scavenging foam 6 are combined to form flotation tailings.

[0045] Table 1 Multiple analysis results of a chrysoberyl-type beryllium deposit in Chenzhou, Hunan

[0046] name BeO <![CDATA[CaF2]]> <![CDATA[Li2O]]> <![CDATA[Cs2O]]> <![CDATA[Rb2O]]> <![CDATA[WO3]]> content(%) 0.31 39.29 0.22 0.0030 0.028 0.20 name Sn Cu Pb Zn <![CDATA[Ta2O5]]> <![CDATA[Nb2O5]]> content(%) 0.065 0.006 0.15 0.12 0.00021 0.0036

[0047] Table 2 Ore dressing indexes using the method of the present invention

[0048]

[0049] Table 3 Floating and sinking sorting indexes

[0050] Product Name Yield (%) BeO grade (%) CaF2 grade (%) BeO recovery rate (%) CaF2 recovery rate (%) Pre-refined (heavy minerals) 66.98 0.42 52.79 91.03 89.99 Light minerals 33.02 0.084 11.91 8.97 10.01 raw ore 100.00 0.31 39.29 100.00 100.00

[0051] Example 2

[0052] A chrysoberyl-type beryllium mine in Chenzhou, Hunan Province, contains 2-3% chrysoberyl and 45-55% fluorite as its main useful minerals. The main gangue minerals are 15-20% calcite, 5-10% dolomite, 5-10% mica, 3-5% chlorite, and a small amount of chlorite and montmorillonite. The raw ore is first crushed to less than 15mm and then sieved to 0.5mm to obtain 15mm-0.5mm material and -0.5mm material, with yields of 91.85% and 8.15% respectively. The 15mm-0.5mm material is sieved to a density of 2.9g / cm 3 The heavy minerals and light minerals are obtained by floating and sinking separation in the medium.

[0053] The heavy minerals separated by floating and sinking are crushed to a suitable particle size for grinding, and then combined with the -0.5mm material screened from the original ore and ground to -0.074mm, accounting for 70%-75%. The sulfide ore is flotated by a roughing process and a scavenging process to obtain sulfide ore flotation foam 1 and tank bottom material 1. 500g / t of water glass, 50g / t of Y89 xanthate, 50g / t of butyl ammonium black powder, and 10g / t of ethyl thiocyanate are added in the roughing process, and 25g / t of Y89 xanthate, 20g / t of butyl ammonium black powder, and 5g / t of ethyl thiocyanate are added in the scavenging process.

[0054] 300 g / t of sodium hydroxide, 800 g / t of sodium carbonate and 1500 g / t of water glass were added to the bottom material 1, and the mixture was stirred for 10 minutes. Then, 150 g / t of oxidized paraffin soap 731 and 250 g / t of sodium oleate were added, and the mixture was stirred for 5 minutes. A roughing operation was performed to obtain a roughing foam 2 and bottom material 2. 400 g / t of water glass, 60 g / t of oxidized paraffin soap 731 and 60 g / t of sodium oleate were added to the bottom material 2, and a scavenging operation was performed to obtain a scavenging foam 3 and bottom material 3.

[0055] The roughing foam 2 and the scavenging foam 3 are combined and put into regrinding. The regrinding fineness is -0.074mm, accounting for 95%. After regrinding, a first cleaning is carried out to obtain fluorite coarse concentrate and bottom material 5. 400g / t of acidic water glass and 200g / t of sodium humate are added in the first cleaning. The bottom material 5 is subjected to two fine scavenging to obtain fine scavenging foam 6 and bottom material 6. The two fine scavengings include fine scavenging I and fine scavenging II. In the fine scavenging I, 200g / t of acidic water glass, 100g / t of sodium humate, 60g / t of sodium hexametaphosphate, 70g / t of oxidized paraffin soap and 50g / t of sodium oleate are added. In the fine scavenging II, 50g / t of acidic water glass, 20g / t of sodium hexametaphosphate, 20g / t of oxidized paraffin soap and 15g / t of sodium oleate are added.

[0056] The bottom material 6 and the bottom material 4 are combined to form beryllium pre-enriched concentrate (abbreviated as beryllium concentrate), and the sulfide ore flotation foam 1, the reverse flotation foam 4 and the fine scavenging foam 6 are combined to form flotation tailings.

[0057] Table 4 Multiple analysis results of a chrysoberyl-type beryllium deposit in Chenzhou, Hunan

[0058] name BeO <![CDATA[CaF2]]> <![CDATA[Li2O]]> <![CDATA[Al2O3]]> <![CDATA[Na2O]]> <![CDATA[K2O]]> content(%) 0.41 52.02 0.31 9.60 0.42 0.76 name MgO <![CDATA[SiO2]]> <![CDATA[Fe2O3]]> Cu Pb Zn content(%) 3.53 5.56 0.99 0.01 0.18 0.19

[0059] Table 5 Ore dressing indexes using the method of the present invention

[0060]

[0061] Table 6 Floating and sinking sorting indexes

[0062]

[0063] Comparative Example 1

[0064] This embodiment uses the same raw ore as that of embodiment 1, and the ore dressing process is as follows: Figure 2 The dosage of flotation reagents is shown in Table 7.

[0065] Table 7 Flotation reagent system

[0066]

[0067] Table 8 Ore dressing indexes of comparative example 1

[0068]

[0069]

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for pre-enrichment of chrysoberyl-type beryllium ore, characterized in that: The following steps are involved: (1) Floating and sinking separation: The chrysoberyl-type beryllium ore is first crushed to a particle size of less than 15 mm, and then sieved to obtain 15 mm-0.5 mm material and -0.5 mm material; the 15 mm-0.5 mm material is sorted by floating and sinking, and the sorting density is 2.8-2.9 g / cm 3 , obtain heavy and light minerals; (2) Sulfide ore flotation: The heavy minerals in step (1) are crushed and combined with the -0.5 mm material to grind to -0.074 mm, accounting for 70%-80%. A roughing separation and a scavenging separation are performed to obtain sulfide ore flotation foam 1 and tank bottom material 1; (3) Floating fluorite: The bottom material 1 of step (2) is subjected to a roughing process to obtain a roughing foam 2 and a bottom material 2, and the bottom material 2 is subjected to a scavenging process to obtain a scavenging foam 3 and a bottom material 3; (4) reverse flotation of gangue: the bottom material 3 of step (3) is subjected to multiple reverse flotation of gangue to obtain bottom material 4, and the foams of multiple reverse flotation of gangue are combined into reverse flotation foam 4; (5) Regrinding and concentration: The roughing foam 2 and the scavenging foam 3 are combined and sent to the regrinding. The regrinding fineness is -0.074mm, accounting for 95%-98%. After regrinding, a concentration is carried out to obtain fluorite coarse concentrate 5 and bottom material 5. The bottom material 5 is subjected to two fine scavengings to obtain fine scavenging foam 6 and bottom material 6. The bottom material 6 and the bottom material 4 are combined to form beryllium pre-enriched concentrate. The sulfide ore flotation foam 1, reverse flotation foam 4 and fine scavenging foam 6 are combined to form flotation tailings. In step (4), the bottom material 3 is subjected to three gangue reverse flotation, wherein 10-100 g / t of dodecylamine hydrochloride and 0-60 g / t of No. 2 oil are added to the first gangue reverse flotation; 300-1000 g / t of water glass, 30-70 g / t of oxidized paraffin soap and 30-50 g / t of sodium oleate are added to the second gangue reverse flotation; and 100-500 g / t of water glass, 10-50 g / t of oxidized paraffin soap and 10-30 g / t of sodium oleate are added to the third gangue reverse flotation; In step (5), 300-500 g / t of acidic water glass and 100-300 g / t of tannic acid or sodium humate are added to the first fine selection; the two fine scavenging selections include fine scavenging selection one and fine scavenging selection two, and in the fine scavenging selection one, 100-200 g / t of acidic water glass, 50-100 g / t of tannic acid or sodium humate, 20-70 g / t of sodium hexametaphosphate, 20-70 g / t of oxidized paraffin soap and 20-50 g / t of sodium oleate are added; in the fine scavenging selection two, 50-100 g / t of acidic water glass, 10-50 g / t of sodium hexametaphosphate, 10-30 g / t of oxidized paraffin soap and 10-30 g / t of sodium oleate are added.

2. The method for pre-enrichment of chrysoberyl-type beryllium ore according to claim 1, characterized in that: In step (2), in a rough selection, add: 300-500 g / t of water glass, 50-80 g / t of Y89 xanthate, 30-50 g / t of butyl ammonium black medicine and 10-20 g / t of ethyl thiocyanate; in a sweep selection, add: 20-40 g / t of Y89 xanthate, 10-20 g / t of butyl ammonium black medicine and 2-5 g / t of ethyl thiocyanate.

3. The method for pre-enrichment of chrysoberyl-type beryllium ore according to claim 1, characterized in that: In step (3), in a rough selection, 300-500 g / t of sodium hydroxide, 500-1000 g / t of sodium carbonate and 1000-2500 g / t of water glass are first added, and after stirring, 100-300 g / t of oxidized paraffin soap and 100-300 g / t of sodium oleate as collectors are added; in a sweep selection, 300-500 g / t of water glass, 50-100 g / t of oxidized paraffin soap and 50-100 g / t of sodium oleate are added.

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