Precise sorting method for high-power and half-high-silica phosphorite

Abstract

The invention provides a precise separation method for high-power and half-high-silica phosphorite. The precise separation method comprises the steps of photoelectric separation pretreatment, selective crushing, ore grinding, screening and targeted flotation. The method comprises the following steps: carrying out photoelectric separation on high-power and half-high siliceous phosphorite to obtain photoelectric separation concentrates and photoelectric separation tailings, carrying out selective ore grinding on the photoelectric separation concentrates, and screening the particle sizes of ore grinding products to distinguish mineral products with different particle size distributions and impurity components. And finally, precise separation and enrichment of the high-power and half-high siliceous phosphorite are realized through targeted flotation. Multi-section double reverse flotation is adopted, and collaborative separation of multiple elements such as magnesium, silicon, iron and aluminum is achieved. Compared with a conventional double-reverse flotation process, the process has the advantages that mineralogical ore properties and the process flow are coupled, so that the flotation process has selectivity; the precise separation method provided by the invention has the advantages of stable beneficiation process flow, good separation effect, high concentrate recovery rate, high phosphate concentrate grade, low content of iron and aluminum sesquioxide in concentrate products and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral separation, and in particular to a method for accurately separating high-half-high siliceous phosphate ore. Background Art

[0002] Phosphate resources are important strategic resources in my country, which are irreplaceable and non-renewable. The composition of phosphate ore in my country is complex, the mineral particles are fine, the distribution is tight, and there are many harmful impurities. Simply removing the magnesium gangue minerals can no longer meet the needs of phosphorus chemical production. The content of sesquioxides in phosphate ore is low, the distribution particle size is fine, and it coexists with other minerals. The degree of dissociation of mineral monomers is low, and the entrainment and random distribution phenomena in the flotation process are obvious, making it difficult to remove.

[0003] At present, the main processes for removing magnesium oxide and sesquioxide from phosphate ore include direct and reverse flotation, double reverse flotation, magnetic flotation separation and gravity flotation separation. Flotation can effectively remove part of the sesquioxide content; magnetic flotation separation is mainly used to remove minerals with high iron gangue mineral content in phosphate ore, and graded flotation is mostly used for phosphate ore with more clay minerals.

[0004] However, collophosphite contains siliceous cryptocrystalline and microcrystalline impurities, and further grinding is required to remove gangue minerals such as quartz and pyrite from the wrapped state. However, too many fine particles in the sorting process will lead to foam entrainment, waste reagents, affect the flotation effect, and make it difficult to recover the useful components in this type of phosphate ore. The use of photoelectric beneficiation technology alone cannot obtain qualified concentrates; the use of flotation technology alone has the disadvantages of high reagent consumption cost, unsatisfactory beneficiation effect, and failure to obtain high-quality phosphate concentrates.

[0005] In summary, in the field of phosphate ore sorting technology, there is an urgent need for a phosphate ore sorting method that can not only obtain qualified concentrate but also have excellent mineral processing effects. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention aims to provide a precise sorting method for high-half-high siliceous phosphate ore, which adopts photoelectric sorting to obtain photoelectric sorting concentrate and photoelectric sorting tailings, and then adopts selective fine grinding to accurately separate high-silicon and high-magnesium ore from high-silicon ore, and then adds a demagnesium collector to the high-silicon and high-magnesium ore separately, and adds a desiliconization collector to the high-silicon ore after demagnesiumization, so as to realize targeted and precise enrichment of the phosphate ore; optimize the process flow, improve the mineral processing efficiency, and realize deep impurity removal in the flotation process.

[0007] In order to achieve the above technical purpose, the technical solution provided by the present invention is: a method for accurately separating high-half-high siliceous phosphate ore, characterized in that it comprises the following steps:

[0008] Step 1, performing photoelectric sorting on the high-half-high siliceous phosphate ore to obtain photoelectric sorting concentrate and photoelectric sorting tailings, and performing tailings disposal on the photoelectric sorting tailings;

[0009] Step 2: Selectively crush, grind and screen the photoelectric separation concentrate, which specifically includes the following steps:

[0010] Step 201, feeding the photoelectric separation concentrate obtained in step 1 into a crushing device to obtain crushed ore, and sieving the crushed ore to obtain crushed ore with a particle size greater than 75 um and crushed ore with a particle size less than 75 um;

[0011] Step 202: feeding the crushed ore with a particle size greater than 75 μm obtained in step 201 into a grinding device for first grinding to obtain a first grinding product, and screening the first grinding product to obtain a first coarse particle product with a particle size greater than 37 μm and a first fine particle product with a particle size less than 37 μm;

[0012] Step 203, screening the first coarse particle product with a particle size greater than 37 um obtained in step 202 to obtain a first coarse particle product with a particle size greater than 75 um and a first coarse particle product with a particle size of 37 um to 75 um, and the first coarse particle product with a particle size greater than 75 um is returned in sequence;

[0013] Step 204, screening the crushed ore with a particle size of less than 75 um obtained in step 201 to obtain crushed ore with a particle size of 25 um to 75 um and crushed ore with a particle size of less than 25 um, and performing tailing treatment on the crushed ore with a particle size of less than 25 um;

[0014] Step 205: feeding the crushed ore with a particle size of 25um to 75um obtained in step 204 into the grinding equipment for a second grinding to obtain a second grinding product, and screening the second grinding product to obtain a second coarse particle product with a particle size of 37um to 75um and a second fine particle product with a particle size less than 37um;

[0015] Step 206, combining the second coarse-grained product with a particle size of 37um to 75um obtained in step 205 with the first coarse-grained product with a particle size of 37um to 75um obtained in step 203 to obtain a high-silicon ore; combining the second fine-grained product with a particle size of less than 37um obtained in step 205 with the first fine-grained product with a particle size of less than 37um obtained in step 202 to obtain a high-silicon and high-magnesium ore;

[0016] Step 3: Targeted flotation of the high-silicon and high-magnesium ore and the high-silicon ore, specifically comprising the following steps:

[0017] Step 301, adding an acidic regulator to the high-silicon and high-magnesium ore obtained in step 206 to obtain an acidic ore pulp;

[0018] Step 302, adding a demagnesiumizing collector to the acidic slurry obtained in step 301 to perform a demagnesiumizing roughing operation to obtain a demagnesiumizing roughing tailing and a demagnesiumizing roughing concentrate;

[0019] Step 303, the demagnesiumized rougher tailings obtained in step 302 are subjected to scavenging operation to obtain demagnesiumized tailings, and the medium ore is returned sequentially;

[0020] Step 304: Mix the de-magnesiumized rougher concentrate obtained in step 302 and the high-silicon raw ore obtained in step 202 to obtain a mixed slurry; add an alkaline regulator to the mixed slurry to obtain a weakly alkaline slurry;

[0021] Step 305, adding a desiliconization collector to the weakly alkaline slurry obtained in step 304 to perform a desiliconization roughing operation to obtain a desiliconization roughing tailing and a desiliconization roughing concentrate;

[0022] Step 306, adding a desiliconizing collector and a desiliconizing adjusting agent to the desiliconized rougher concentrate obtained in step 305 again, performing a desiliconizing concentration operation, and obtaining a final concentrate;

[0023] Step 307: The desiliconized rougher tailings obtained in step 305 are subjected to three sweeping operations to obtain desiliconized tailings, and the intermediate ore is returned in sequence.

[0024] The above-mentioned method for precise separation of high-half-fold high-siliceous phosphate ore is characterized in that the high-half-fold high-siliceous phosphate ore is a high-siliceous phosphate ore with high-half-fold oxides; the high-half-fold oxides specifically refer to: half-fold oxides with a mass fraction greater than 3.0% in the phosphate ore; the high-siliceous phosphate ore specifically refers to: phosphate ore with a mass fraction of SiO2 greater than 10%; the high-half-fold high-siliceous phosphate ore includes the following chemical components: P2O5 with a mass fraction of 24.0% to 29.8%, MgO with a mass fraction of 1.0% to 5%, SiO2 with a mass fraction of 10.0% to 30.0%, and half-fold oxides with a mass fraction of 3.0% to 10.0%.

[0025] The above-mentioned method for accurate separation of high-half-high siliceous phosphate ore is characterized in that the equipment used for screening in step 2 is a rotary vibrating screen; and the crushing equipment in step 201 is a stone roller crusher.

[0026] The above-mentioned method for accurate separation of high-half-high siliceous phosphate ore is characterized in that the grinding equipment in step 202 and step 205 is one or a combination of high-pressure roller mill, rod mill and ball mill.

[0027] The above-mentioned method for precise separation of high-half-high silicon phosphate ore is characterized in that the acidic adjuster in step 301 is phosphoric acid and / or sulfuric acid; the molar fraction of the acidic adjuster is 10%, and the dosage of the acidic adjuster is 4kg to 8kg / t high-silicon and high-magnesium ore.

[0028] The above-mentioned method for precise separation of high-half-high silicon phosphate ore is characterized in that the demagnesium collector in step 302 is a fatty acid anion collector; the dosage of the demagnesium agent is 0.2kg to 0.5kg / t high-silicon and high-magnesium ore.

[0029] The above-mentioned method for accurate separation of high-half-high siliceous phosphate ore is characterized in that the fatty acid anion collector is oleic acid or cyclohexane acid.

[0030] The above-mentioned precise separation method of high-half-high siliceous phosphate ore is characterized in that the alkaline adjusting agent in step 304 is one or a combination of lime water, sodium carbonate solution and sodium hydroxide solution; the molar fraction of the alkaline adjusting agent is 10%, and the dosage of the alkaline adjusting agent is 0.5kg~5kg / t high-half-high siliceous phosphate ore.

[0031] The above-mentioned precise separation method of high-half-high siliceous phosphate ore is characterized in that the desiliconization collectors in step 305 and step 306 are both amine cationic collectors, the amount of the desiliconization collector in step 305 is 0.1kg-0.4kg / t high-half-high siliceous phosphate ore, and the amount of the desiliconization collector in step 306 is 0.05kg-0.3kg / t high-half-high siliceous phosphate ore; the desiliconization adjusting agent in step 305 and step 306 is one or more of organic silicon, dimethyl silicone oil and quaternary ammonium salt. The amount of the desiliconization adjusting agent in step 305 is 0.3kg-0.9kg / t high-half-high siliceous phosphate ore, and the amount of the desiliconization adjusting agent in step 306 is 0.1kg-0.6kg / t high-half-high siliceous phosphate ore.

[0032] The above-mentioned method for precise separation of high-half-high siliceous phosphate ore is characterized in that the amine cationic collector is one of ammonium bromide, ether amine and dodecylamine.

[0033] The beneficial effects of the present invention are:

[0034] 1. The present invention realizes process optimization in the pre-selection stage, couples the mineralogical characteristics of phosphate ore with the mineral processing method, uses photoelectric sorting technology to identify the ore grade, and removes low-grade waste rock and rough stone, thereby solving the technical problems of poor sorting performance and weak targeting of reagents and flotation processes in conventional process flows; further improves the situation of poor comprehensive technical and economic indicators and inability to ensure stable production, thereby improving mineral processing efficiency.

[0035] 2. The selective grinding adopted in the present invention can achieve the monomer dissociation of the crushed ore, so that the grinding product containing dolomite and mica components is enriched to a particle size of less than 37um, and the grinding product containing quartz components is enriched to a particle size of 37um-75um, thereby distinguishing high-silicon and high-magnesium ore from high-silicon ore, and can accurately add magnesium removal collectors to the high-silicon and high-magnesium ore, thereby improving the sorting property of the phosphate ore while optimizing the process.

[0036] 3. The present invention constructs a method for precise coordinated sorting, by precisely adding a demagnesium collector to the high-silicon and high-magnesium ore, then combining the demagnesium rougher tailings and the high-silicon ore, and adding a desiliconizing agent to the combined slurry, so that the demagnesium rougher concentrate and the high-silicon and high-magnesium ore are desiliconized simultaneously, thereby optimizing the agent system and optimizing the process to the greatest extent.

[0037] 4. The present invention uses photoelectric sorting and selective crushing and screening to do the preliminary work for the subsequent precise sorting, so that the high-silicon and high-magnesium ore can be separately added with a demagnesium collector for tailing and flotation, saving manpower and material costs and improving the efficiency of the process.

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The present invention is a process flow chart for recovering phosphate ore from high-half-high siliceous phosphate ore. DETAILED DESCRIPTION

[0040] The specific technical solutions of the present invention are further described below to help those skilled in the art further understand the present invention without limiting the rights thereof.

[0041] The collophanite used in Examples 1 to 5 of the present invention is taken from a phosphate ore in Guizhou, and the chemical composition of the ore is shown in Table 1. The mass fraction of P2O5 in the ore sample is high, the mass fraction of MgO is low, the mass fraction of sesquioxide is high, and harmful impurity elements such as iron, aluminum, and magnesium are enriched in fine particles; the mineral composition of the ore is shown in Table 2, and the useful minerals in the ore mainly exist in the form of fluoroapatite, and the gangue minerals are mainly quartz, followed by pyrite and clay minerals, and also contain a small amount of dolomite, sodium potassium feldspar, etc. Most of the gangue minerals are wrapped in the collophanite in fine and fine particles, with complex embedding relationships, and belong to medium-high grade, complex and difficult to select high-sesquioxide high-siliceous phosphate ore.

[0042] Table 1

[0043] Element <![CDATA[P2O5]]> MgO CaO <![CDATA[SiO2]]> <![CDATA[Al2O3]]> content / % 28.77 1.47 40.73 13.13 3.54 Element <![CDATA[Fe2O3]]> <![CDATA[K2O]]> <![CDATA[Na2O]]> <![CDATA[R2O3]]> - content / % 1.85 0.98 0.21 5.39 -

[0044] Table 2

[0045] Components Fluorapatite quartz Mica Kaolinite dolomite content / % 70.1 10.37 9.68 2.72 7.13

[0046] Example 1

[0047] A method for accurately separating high-half-high siliceous phosphate ore comprises the following steps:

[0048] Step 1, performing photoelectric sorting on high-half-high siliceous phosphate ore to obtain photoelectric sorting concentrate and photoelectric sorting tailings, and performing tailings discarding on the photoelectric sorting tailings; the mass fraction of P2O5 in the photoelectric sorting concentrate is 29.75%, and the mass fraction of P2O5 in the photoelectric sorting tailings is 14.25%;

[0049] Step 2: Selectively crush, grind and screen the photoelectric separation concentrate, including the following steps:

[0050] Step 201, feeding the photoelectrically separated concentrate in step 1 into a rock roller crusher to obtain crushed ore, and sieving the crushed ore through a rotary vibrating screen to obtain crushed ore with a particle size greater than 75 um and crushed ore with a particle size less than 75 um;

[0051] Step 202: feeding the crushed ore with a particle size greater than 75 μm obtained in step 201 into a high pressure roller mill for first grinding to obtain a first grinding product, and screening the first grinding product to obtain a first coarse particle product with a particle size greater than 37 μm and a first fine particle product with a particle size less than 37 μm;

[0052] Step 203, screening the first coarse particle product with a particle size greater than 37 um obtained in step 202 to obtain a first coarse particle product with a particle size greater than 75 um and a first coarse particle product with a particle size of 37 um to 75 um, and the first coarse particle product with a particle size greater than 75 um is returned in sequence;

[0053] Step 204, screening the crushed ore with a particle size of less than 75 um obtained in step 201 to obtain crushed ore with a particle size of 25 um to 75 um and crushed ore with a particle size of less than 25 um, and performing tailing treatment on the crushed ore with a particle size of less than 25 um;

[0054] Step 205: feeding the crushed ore with a particle size of 25um to 75um obtained in step 204 into the high pressure roller mill for a second grinding to obtain a second grinding product, and screening the second grinding product to obtain a second coarse particle product with a particle size of 37um to 75um and a second fine particle product with a particle size less than 37um;

[0055] Step 206, combining the second coarse-grained product with a particle size of 37um to 75um obtained in step 205 with the first coarse-grained product with a particle size of 37um-75um obtained in step 203 to obtain a high-silicon ore; combining the second fine-grained product with a particle size of less than 37um obtained in step 205 with the first fine-grained product with a particle size of less than 37um obtained in step 202 to obtain a high-silicon and high-magnesium ore; combined with mineralogy, the grinding product containing dolomite and mica components is enriched to a particle size of less than 37um, and the grinding product containing quartz components is enriched to a particle size of 37um to 75um; the mass fraction of P2O5 in the high-silicon and high-magnesium ore is 30.83%, and the mass fraction of P2O5 in the high-silicon ore is 31.21%;

[0056] Step 3: Targeted flotation of the high-silicon and high-magnesium ore and the high-silicon ore, comprising the following steps:

[0057] Step 301, adding 4kg / t phosphoric acid of the high-silicon and high-magnesium ore to the high-silicon and high-magnesium ore obtained in step 206 to adjust the pH to obtain an acidic ore slurry; the molar fraction of the phosphoric acid is 10%;

[0058] Step 302, adding 0.2 kg / t of cyclopentane acid of high-silicon and high-magnesium ore to the acidic slurry obtained in step 301 to carry out a demagnesium roughing operation to obtain a demagnesium roughing tailing and a demagnesium roughing concentrate;

[0059] Step 303, performing a scavenging operation on the demagnesiumized roughing tailings obtained in step 302 to obtain demagnesiumized tailings;

[0060] Step 304: Mix the de-magnesiumized rougher concentrate obtained in step 302 and the high-silicon ore obtained in step 206, add 0.5 kg / t of high-half-high silicon phosphate rock lime to adjust the pH, and obtain a weakly alkaline slurry;

[0061] Step 305, adding 0.1kg / t of ammonium bromide of high-half-high siliceous phosphate ore to the weakly alkaline slurry obtained in step 304, and then adding 0.3kg / t of organosilicon of high-half-high siliceous phosphate ore to carry out desiliconization roughing operation to obtain desiliconization roughing tailings and desiliconization roughing concentrate;

[0062] Step 306, adding 0.05kg / t of ammonium bromide of high half-high siliceous phosphate ore to the desiliconized rougher concentrate obtained in step 305 again, and then adding 0.1kg / t of organic silicon of high half-high siliceous phosphate ore to carry out desiliconization and concentration operation to obtain a final concentrate;

[0063] Step 307, subjecting the desiliconized rougher tailings obtained in step 305 to three sweeping operations to obtain desiliconized tailings.

[0064] The P2O5 grade of the original ore used in Example 1 is 28.77%, the MgO mass content is 1.47%, and the SiO2 mass content is 13.13%. The obtained comprehensive phosphate concentrate has a P2O5 grade of 35.43%, a comprehensive phosphate concentrate P2O5 recovery rate of 85.13%, a MgO mass content of 0.38%, a SiO2 mass content of 6.38%, and a sesquioxide (Fe2O3 + Al2O3) mass content of 1.97%. The experimental results of Example 1 are shown in Table 3.

[0065] Table 3

[0066] product <![CDATA[P2O5%]]> MgO% <![CDATA[SiO2%]]> <![CDATA[Fe2O3%+Al2O3%]]> Phosphorus recovery rate % Ore 28.77 1.47 13.13 5.39 - Final Concentrate 35.43 0.38 6.38 1.97 85.13

[0067] Example 2

[0068] A method for accurately separating high-half-high siliceous phosphate ore comprises the following steps:

[0069] Step 1, performing photoelectric sorting on high-half-high siliceous phosphate ore to obtain photoelectric sorting concentrate and photoelectric sorting tailings, and performing tailings discarding on the photoelectric sorting tailings; the mass fraction of P2O5 in the photoelectric sorting concentrate is 28.05%, and the mass fraction of P2O5 in the photoelectric sorting tailings is 12.79%;

[0070] Step 2: Selectively crush, grind and screen the photoelectric separation concentrate, including the following steps:

[0071] Step 201, feeding the photoelectrically separated concentrate in step 1 into a rock roller crusher to obtain crushed ore, and sieving the crushed ore through a rotary vibrating screen to obtain crushed ore with a particle size greater than 75 um and crushed ore with a particle size less than 75 um;

[0072] Step 202: feeding the crushed ore with a particle size greater than 75 μm obtained in step 201 into a high pressure roller mill for first grinding to obtain a first grinding product, and screening the first grinding product to obtain a first coarse particle product with a particle size greater than 37 μm and a first fine particle product with a particle size less than 37 μm;

[0073] Step 203, screening the first coarse particle product with a particle size greater than 37 um obtained in step 202 to obtain a first coarse particle product with a particle size greater than 75 um and a first coarse particle product with a particle size of 37 um to 75 um, and the first coarse particle product with a particle size greater than 75 um is returned in sequence;

[0074] Step 204, screening the crushed ore with a particle size of less than 75 um obtained in step 201 to obtain crushed ore with a particle size of 25 um to 75 um and crushed ore with a particle size of less than 25 um, and performing tailing treatment on the crushed ore with a particle size of less than 25 um;

[0075] Step 205: feeding the crushed ore with a particle size of 25um to 75um obtained in step 204 into the high pressure roller mill for a second grinding to obtain a second grinding product, and screening the second grinding product to obtain a second coarse particle product with a particle size of 37um to 75um and a second fine particle product with a particle size less than 37um;

[0076] Step 206, combining the second coarse-grained product with a particle size of 37um to 75um obtained in step 205 with the first coarse-grained product with a particle size of 37um-75um obtained in step 203 to obtain a high-silicon ore; combining the second fine-grained product with a particle size of less than 37um obtained in step 205 with the first fine-grained product with a particle size of less than 37um obtained in step 202 to obtain a high-silicon and high-magnesium ore; combined with mineralogy, the grinding product containing dolomite and mica components is enriched to a particle size of less than 37um, and the grinding product containing quartz components is enriched to a particle size of 37um to 75um; the mass fraction of P2O5 in the high-silicon and high-magnesium ore is 29.79%, and the mass fraction of P2O5 in the high-silicon ore is 30.27%

[0077] Step 3: Targeted flotation of the high-silicon and high-magnesium ore and the high-silicon ore, comprising the following steps:

[0078] Step 301, adding 6kg / t sulfuric acid of the high-silicon and high-magnesium ore to the high-silicon and high-magnesium ore obtained in step 206 to adjust the pH to obtain an acidic ore pulp; the molar fraction of the phosphoric acid is 10%;

[0079] Step 302, adding 0.3 kg / t of oleic acid of high-silicon and high-magnesium ore to the acidic slurry obtained in step 301 to carry out a demagnesium roughing operation to obtain a demagnesium roughing tailing and a demagnesium roughing concentrate;

[0080] Step 303, performing a scavenging operation on the demagnesized roughing tailings obtained in step 302 to obtain demagnesized tailings;

[0081] Step 304: Mix the de-magnesiumized rougher concentrate obtained in step 302 and the high-silicon ore obtained in step 202, and add 3kg / t of sodium carbonate of high-half-high silicon phosphate rock to adjust the pH of the slurry to obtain a weakly alkaline slurry;

[0082] Step 305, adding 0.3kg / t of etheramine of high-half-high siliceous phosphate rock to the weakly alkaline slurry obtained in step 304, and then adding 0.6kg / t of dimethyl silicone oil of high-half-high siliceous phosphate rock to carry out desiliconization roughing operation to obtain desiliconized roughing tailings and desiliconized roughing concentrate;

[0083] Step 306, adding 0.2kg / t of etheramine of high half-high siliceous phosphate ore again to the desiliconized rougher concentrate obtained in step 305, and then adding 0.3kg / t of dimethyl silicone oil of high half-high siliceous phosphate ore to perform desiliconization and concentration operation to obtain a final concentrate;

[0084] Step 307, subjecting the desiliconized rougher tailings obtained in step 305 to three sweeping operations to obtain desiliconized tailings.

[0085] The P2O5 grade of the original ore used in the above method is 27.56%, the MgO mass content is 1.78%, and the SiO2 mass content is 14.62%. The obtained comprehensive phosphate concentrate has a P2O5 grade of 34.47%, a comprehensive phosphate concentrate P2O5 recovery rate of 84.95%, a MgO mass content of 0.44%, a SiO2 mass content of 7.81%, and a sesquioxide (Fe2O3 + Al2O3) mass content of 2.22%. The experimental results of Example 2 are shown in Table 4.

[0086] Table 4

[0087]

[0088]

[0089] Example 3

[0090] A method for accurately separating high-half-high siliceous phosphate ore comprises the following steps:

[0091] Step 1, performing photoelectric sorting on high-half-high siliceous phosphate ore to obtain photoelectric sorting concentrate and photoelectric sorting tailings, and performing tailings discarding on the photoelectric sorting tailings; the mass fraction of P2O5 in the photoelectric sorting concentrate is 29.36%, and the mass fraction of P2O5 in the photoelectric sorting tailings is 12.87%;

[0092] Step 2: Selectively crush, grind and screen the photoelectric separation concentrate, including the following steps:

[0093] Step 201, feeding the photoelectrically separated concentrate in step 1 into a rock roller crusher to obtain crushed ore, and sieving the crushed ore through a rotary vibrating screen to obtain crushed ore with a particle size greater than 75 um and crushed ore with a particle size less than 75 um;

[0094] Step 202: feeding the crushed ore with a particle size greater than 75 μm obtained in step 201 into a rod mill for first grinding to obtain a first grinding product, and screening the first grinding product to obtain a first coarse particle product with a particle size greater than 37 μm and a first fine particle product with a particle size less than 37 μm;

[0095] Step 203, screening the first coarse particle product with a particle size greater than 37 um obtained in step 202 to obtain a first coarse particle product with a particle size greater than 75 um and a first coarse particle product with a particle size of 37 um to 75 um, and the first coarse particle product with a particle size greater than 75 um is returned in sequence;

[0096] Step 204, screening the crushed ore with a particle size of less than 75 um obtained in step 201 to obtain crushed ore with a particle size of 25 um to 75 um and crushed ore with a particle size of less than 25 um, and performing tailing treatment on the crushed ore with a particle size of less than 25 um;

[0097] Step 205: feeding the crushed ore with a particle size of 25um to 75um obtained in step 204 into the rod mill for a second grinding to obtain a second grinding product, and screening the second grinding product to obtain a second coarse particle product with a particle size of 37um to 75um and a second fine particle product with a particle size less than 37um;

[0098] Step 206, combining the second coarse-grained product with a particle size of 37um to 75um obtained in step 205 with the first coarse-grained product with a particle size of 37um-75um obtained in step 203 to obtain a high-silicon ore; combining the second fine-grained product with a particle size of less than 37um obtained in step 205 with the first fine-grained product with a particle size of less than 37um obtained in step 202 to obtain a high-silicon and high-magnesium ore; combined with mineralogy, it can be seen that the grinding product containing dolomite and mica components is enriched to a particle size of less than 37um, and the grinding product containing quartz components is enriched to a particle size of 37um to 75um; the mass fraction of P2O5 in the high-silicon and high-magnesium ore is 30.56%, and the mass fraction of P2O5 in the high-silicon ore is 29.45%

[0099] Step 3: Carry out targeted flotation enrichment and impurity removal on the high-silicon and high-magnesium ore and the high-silicon ore, comprising the following steps:

[0100] Step 301, adding 8 kg / t of phosphoric acid and sulfuric acid to the high-silicon and high-magnesium ore obtained in step 206 to adjust the pH to obtain an acidic ore pulp; the molar fraction of the phosphoric acid and sulfuric acid is 10%;

[0101] Step 302, adding 0.5 kg / t of cyclopentane acid of high-silicon and high-magnesium ore to the acidic slurry obtained in step 301 to carry out a demagnesium roughing operation to obtain a demagnesium roughing tailing and a demagnesium roughing concentrate;

[0102] Step 303, performing a scavenging operation on the demagnesiumized roughing tailings obtained in step 302 to obtain demagnesiumized tailings;

[0103] Step 304: Mix the de-magnesiumized rougher concentrate obtained in step 302 and the high-silicon ore obtained in step 202, add 5kg / t of high-half-high silicon phosphate rock sodium carbonate to adjust the pH, and obtain a weakly alkaline slurry;

[0104] Step 305, adding 0.4 kg / t of dodecylamine of high-half-high siliceous phosphate rock to the weakly alkaline slurry obtained in step 304, and then adding 0.9 kg / t of quaternary ammonium salt of high-half-high siliceous phosphate rock to carry out desiliconization roughing operation to obtain desiliconization roughing tailings and desiliconization roughing concentrate;

[0105] Step 306, adding 0.3 kg / t of dodecylamine of high half-high siliceous phosphate ore to the desiliconized rougher concentrate obtained in step 305 again, and then adding 0.6 kg / t of quaternary ammonium salt of high half-high siliceous phosphate ore to perform desiliconization and concentration operation to obtain a final concentrate;

[0106] Step 307, subjecting the desiliconized rougher tailings obtained in step 305 to three sweeping operations to obtain desiliconized tailings.

[0107] The P2O5 grade of the original ore used in Example 3 is 28.15%, the MgO mass content is 1.57%, and the SiO2 mass content is 13.85%. The obtained comprehensive phosphate concentrate has a P2O5 grade of 34.21%, a comprehensive phosphate concentrate P2O5 recovery rate of 85.11%, a MgO mass content of 0.41%, a SiO2 mass content of 6.94%, and a sesquioxide (Fe2O3 + Al2O3) mass content of 2.02%. The experimental results of Example 3 are shown in Table 5.

[0108] Table 5

[0109] product <![CDATA[P2O5%]]> MgO% <![CDATA[SiO2%]]> <![CDATA[Fe2O3%+Al2O3%]]> Phosphorus recovery rate % Ore 28.77 1.57 13.85 6.12 - Final Concentrate 34.21 0.41 6.94 2.02 85.11

[0110] Example 4

[0111] A method for accurately separating high-half-high siliceous phosphate ore comprises the following steps:

[0112] Step 1, performing photoelectric sorting on high-half-high siliceous phosphate ore to obtain photoelectric sorting concentrate and photoelectric sorting tailings, and performing tailings discarding on the photoelectric sorting tailings; the mass fraction of P2O5 in the photoelectric sorting concentrate is 29.57%, and the mass fraction of P2O5 in the photoelectric sorting tailings is 14.62%;

[0113] Step 2: Selectively crush, grind and screen the photoelectric separation concentrate, including the following steps:

[0114] Step 201, feeding the photoelectrically separated concentrate in step 1 into a rock roller crusher to obtain crushed ore, and sieving the crushed ore through a rotary vibrating screen to obtain crushed ore with a particle size greater than 75 um and crushed ore with a particle size less than 75 um;

[0115] Step 202: feeding the crushed ore with a particle size greater than 75 μm obtained in step 201 into a ball mill for first grinding to obtain a first grinding product, and screening the first grinding product to obtain a first coarse particle product with a particle size greater than 37 μm and a first fine particle product with a particle size less than 37 μm;

[0116] Step 203, screening the first coarse particle product with a particle size greater than 37 um obtained in step 202 to obtain a first coarse particle product with a particle size greater than 75 um and a first coarse particle product with a particle size of 37 um to 75 um, and the first coarse particle product with a particle size greater than 75 um is returned in sequence;

[0117] Step 204, screening the crushed ore with a particle size of less than 75 um obtained in step 201 to obtain crushed ore with a particle size of 25 um to 75 um and crushed ore with a particle size of less than 25 um, and performing tailing treatment on the crushed ore with a particle size of less than 25 um;

[0118] Step 205, feeding the crushed ore with a particle size of 25um to 75um obtained in step 204 into the ball mill for a second grinding to obtain a second grinding product, and sieving the second grinding product to obtain a second coarse particle product with a particle size of 37um to 75um and a second fine particle product with a particle size less than 37um;

[0119] Step 206, combining the second coarse-grained product with a particle size of 37um to 75um obtained in step 205 with the first coarse-grained product with a particle size of 37um-75um obtained in step 203 to obtain a high-silicon ore; combining the second fine-grained product with a particle size of less than 37um obtained in step 205 with the first fine-grained product with a particle size of less than 37um obtained in step 202 to obtain a high-silicon and high-magnesium ore; combined with mineralogy, the grinding product containing dolomite and mica components is enriched to a particle size of less than 37um, and the grinding product containing quartz components is enriched to a particle size of 37um to 75um; the mass fraction of P2O5 in the high-silicon and high-magnesium ore is 30.45%, and the mass fraction of P2O5 in the high-silicon ore is 31.02%

[0120] Step 3: Targeted flotation of the high-silicon and high-magnesium ore and the high-silicon ore, comprising the following steps:

[0121] Step 301, adding 5kg / t phosphoric acid of the high-silicon and high-magnesium ore to the high-silicon and high-magnesium ore obtained in step 206 to adjust the pH to obtain an acidic ore slurry; the molar fraction of the phosphoric acid is 10%;

[0122] Step 302, adding 0.5 kg / t of cyclopentane acid of high-silicon and high-magnesium ore to the acidic slurry obtained in step 301 to carry out a demagnesium roughing operation to obtain a demagnesium roughing tailing and a demagnesium roughing concentrate;

[0123] Step 303, performing a scavenging operation on the demagnesiumized roughing tailings obtained in step 302 to obtain demagnesiumized tailings;

[0124] Step 304: Mix the de-magnesiumized rougher concentrate obtained in step 302 and the high-silicon ore obtained in step 202, add a mixed solution of 5 kg / t high-half-high silicon phosphate rock sodium carbonate solution and sodium hydroxide to adjust the pH to obtain a weakly alkaline slurry;

[0125] Step 305, adding 0.4 kg / t of ammonium bromide of high-half-high siliceous phosphate ore to the weakly alkaline slurry obtained in step 304, and then adding 0.9 kg / t of organosilicon and quaternary ammonium salt of high-half-high siliceous phosphate ore to carry out desiliconization roughing operation to obtain desiliconized roughing tailings and desiliconized roughing concentrate;

[0126] Step 306, adding 0.3 kg / t of ammonium bromide of high half-high siliceous phosphate ore to the desiliconized rougher concentrate obtained in step 305 again, and then adding 0.6 kg / t of organosilicon and quaternary ammonium salt of high half-high siliceous phosphate ore to carry out desiliconization and concentration operation to obtain a final concentrate;

[0127] Step 307, subjecting the desiliconized rougher tailings obtained in step 305 to three sweeping operations to obtain desiliconized tailings.

[0128] The P2O5 grade of the original ore used in Example 4 is 29.01%, the MgO mass content is 1.64%, and the SiO2 mass content is 13.20%. The obtained comprehensive phosphate concentrate has a P2O5 grade of 36.14%, a comprehensive phosphate concentrate P2O5 recovery rate of 86.13%, a MgO mass content of 0.29%, a SiO2 mass content of 6.45%, and a sesquioxide (Fe2O3 + Al2O3) mass content of 2.01%. The experimental results of Example 4 are shown in Table 6.

[0129] Table 6

[0130] product <![CDATA[P2O5%]]> MgO% <![CDATA[SiO2%]]> <![CDATA[Fe2O3%+Al2O3%]]> Phosphorus recovery rate % Ore 29.01 1.64 13.20 5.89 - Final Concentrate 36.14 0.29 6.45 2.01 86.13

[0131] Example 5

[0132] A method for accurately separating high-half-high siliceous phosphate ore comprises the following steps:

[0133] Step 1, performing photoelectric sorting on high-half-high siliceous phosphate ore to obtain photoelectric sorting concentrate and photoelectric sorting tailings, and performing tailings discarding on the photoelectric sorting tailings; the mass fraction of P2O5 in the photoelectric sorting concentrate is 28.16%, and the mass fraction of P2O5 in the photoelectric sorting tailings is 14.38%;

[0134] Step 2: Selectively crush, grind and screen the photoelectric separation concentrate, including the following steps:

[0135] Step 201, feeding the photoelectrically separated concentrate in step 1 into a rock roller crusher to obtain crushed ore, and sieving the crushed ore through a rotary vibrating screen to obtain crushed ore with a particle size greater than 75 um and crushed ore with a particle size less than 75 um;

[0136] Step 202: feeding the crushed ore with a particle size greater than 75 μm obtained in step 201 into a combined grinding device of a ball mill and a rod mill for first grinding to obtain a first grinding product, and screening the first grinding product to obtain a first coarse particle product with a particle size greater than 37 μm and a first fine particle product with a particle size less than 37 μm;

[0137] Step 203, screening the first coarse particle product with a particle size greater than 37 um obtained in step 202 to obtain a first coarse particle product with a particle size greater than 75 um and a first coarse particle product with a particle size of 37 um to 75 um, and the first coarse particle product with a particle size greater than 75 um is returned in sequence;

[0138] Step 204, screening the crushed ore with a particle size of less than 75 um obtained in step 201 to obtain crushed ore with a particle size of 25 um to 75 um and crushed ore with a particle size of less than 25 um, and performing tailing treatment on the crushed ore with a particle size of less than 25 um;

[0139] Step 205: feeding the crushed ore with a particle size of 25um to 75um obtained in step 204 into the combined grinding equipment of the ball mill and the rod mill for a second grinding to obtain a second grinding product, and sieving the second grinding product to obtain a second coarse particle product with a particle size of 37um to 75um and a second fine particle product with a particle size less than 37um;

[0140] Step 206, combining the second coarse-grained product with a particle size of 37um to 75um obtained in step 205 with the first coarse-grained product with a particle size of 37um-75um obtained in step 203 to obtain a high-silicon ore; combining the second fine-grained product with a particle size of less than 37um obtained in step 205 with the first fine-grained product with a particle size of less than 37um obtained in step 202 to obtain a high-silicon and high-magnesium ore; combined with mineralogy, it can be seen that the grinding product containing dolomite and mica components is enriched to a particle size of less than 37um, and the grinding product containing quartz components is enriched to a particle size of 37um to 75um; the mass fraction of P2O5 in the high-silicon and high-magnesium ore is 30.96%, and the mass fraction of P2O5 in the high-silicon ore is 30.01%

[0141] Step 3: Targeted flotation of the high-silicon and high-magnesium ore and the high-silicon ore, comprising the following steps:

[0142] Step 301, adding 5kg / t of a mixed acid solution of phosphoric acid and sulfuric acid to the high-silicon and high-magnesium ore obtained in step 206 to adjust the pH to obtain an acidic ore pulp; the molar fraction of the mixed acid solution of phosphoric acid and sulfuric acid is 10%;

[0143] Step 302, adding 0.4 kg / t of oleic acid of high-silicon and high-magnesium ore to the acidic slurry obtained in step 301 to carry out a demagnesium roughing operation to obtain a demagnesium roughing tailing and a demagnesium roughing concentrate;

[0144] Step 303, performing a scavenging operation on the demagnesiumized roughing tailings obtained in step 302 to obtain demagnesiumized tailings;

[0145] Step 304: Mix the de-magnesiumized rougher concentrate obtained in step 302 and the high-silicon ore obtained in step 202, add 3kg / t of high-half-high silicon phosphate rock sodium carbonate to adjust the slurry pH to obtain a weakly alkaline slurry;

[0146] Step 305, adding 0.4kg / t of dodecylamine of high-half-high siliceous phosphate rock to the weakly alkaline slurry obtained in step 304, and then adding 0.6kg / t of a combined desiliconization adjusting agent of dimethyl silicone oil and organic silicon of high-half-high siliceous phosphate rock to perform desiliconization roughing operation to obtain desiliconized roughing tailings and desiliconized roughing concentrate;

[0147] Step 306, adding 0.1 kg / t of dodecylamine in the form of high-half-high siliceous phosphate rock to the desiliconized rougher concentrate obtained in step 305 again, and then adding 0.4 kg / t of a combined desiliconizing adjusting agent of dimethyl silicone oil and organic silicon in the form of high-half-high siliceous phosphate rock to carry out desiliconization and concentration operation to obtain a final concentrate;

[0148] Step 307, subjecting the desiliconized rougher tailings obtained in step 305 to three sweeping operations to obtain desiliconized tailings.

[0149] The P2O5 grade of the original ore used in Example 5 is 29.14%, the MgO mass content is 1.65%, and the SiO2 mass content is 13.54%. The obtained comprehensive phosphate concentrate has a P2O5 grade of 36.24%, a comprehensive phosphate concentrate P2O5 recovery rate of 85.19%, a MgO mass content of 0.27%, a SiO2 mass content of 6.27%, and a sesquioxide (Fe2O3 + Al2O3) mass content of 1.93%. The experimental results of Example 5 are shown in Table 7.

[0150] Table 7

[0151] product <![CDATA[P2O5%]]> MgO% <![CDATA[SiO2%]]> <![CDATA[Fe2O3%+Al2O3%]]> Phosphorus recovery rate % Ore 29.14 1.65 13.54 5.91 - Final Concentrate 36.24 0.27 6.27 1.93 85.19

[0152] Comparative Example 1

[0153] The same batch of ore materials and method as in Example 1 were used to recover phosphate ore, except that: compared with Example 1, no pretreatment and selective crushing and grinding were performed, and the classification-double reverse flotation process was directly used to carry out the beneficiation test of high-half-high siliceous phosphate ore. After one screening, the 37um particle size oversize and undersize materials were subjected to flotation tests respectively, and the flotation process of first desiliconization and then demagnesiumization was carried out. The flotation reagent was the same as that used in the flotation in Example 1. Specific beneficiation test indicators are shown in Table 8.

[0154] The above method uses an original ore with a P2O5 grade of 28.89%, a MgO mass content of 1.67%, and a SiO2 mass content of 13.05%. The obtained comprehensive phosphate concentrate has a P2O5 grade of 32.79%, a comprehensive phosphate concentrate P2O5 recovery rate of 84.28%, a MgO mass content of 0.66%, a SiO2 mass content of 8.52%, and a sesquioxide (Fe2O3+Al2O3) mass content of 2.59%.

[0155] Table 8

[0156]

[0157] Comparative Example 2

[0158] The phosphate rock was recovered by using the ore material and method of Example 1, except that: compared with Example 1, no pretreatment and selective crushing and grinding operations were performed, and compared with Comparative Example 1, no screening operation was performed. A flotation process of first desiliconization and then demagnesiumization was directly adopted to carry out a high-half-high siliceous phosphate ore dressing test. The flotation reagent was consistent with that in Example 1. Specific dressing test indicators are shown in Table 9.

[0159] The above method uses an original ore with a P2O5 grade of 28.77%, a MgO mass content of 1.47%, and a SiO2 mass content of 13.13%. The obtained comprehensive phosphate concentrate has a P2O5 grade of 32.66%, a comprehensive phosphate concentrate P2O5 recovery rate of 83.79%, a MgO mass content of 0.62%, a SiO2 mass content of 9.68%, and a sesquioxide (Fe2O3+Al2O3) mass content of 3.31%.

[0160] Table 9

[0161]

[0162] It can be seen from the experimental data records in Tables 8 and 9 that the phosphorus recovery rates in Examples 1 to 5 are all greater than those in Comparative Examples 1 and 2, and the sesquioxide content in the final concentrate is also lower than that in Comparative Examples 1 and 2. It can be concluded that the precise separation method for high-sesquioxide high-siliceous phosphate ore provided by the present invention has the advantages of stable beneficiation process, good separation effect, high concentrate recovery rate, high grade of phosphate concentrate, and low iron and aluminum sesquioxide content in the concentrate product, and can achieve process optimization to the greatest extent to obtain qualified phosphate ore products.

[0163] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for accurately separating high-half-high siliceous phosphate ore, characterized in that: The following steps are involved: Step 1, performing photoelectric sorting on the high-half-high siliceous phosphate ore to obtain photoelectric sorting concentrate and photoelectric sorting tailings, and performing tailings disposal on the photoelectric sorting tailings; Step 2: Selectively crush, grind and screen the photoelectric separation concentrate, which specifically includes the following steps: Step 201, feeding the photoelectric separation concentrate obtained in step 1 into a crushing device to obtain crushed ore, and sieving the crushed ore to obtain crushed ore with a particle size greater than 75 um and crushed ore with a particle size less than 75 um; Step 202: feeding the crushed ore with a particle size greater than 75 μm obtained in step 201 into a grinding device for first grinding to obtain a first grinding product, and screening the first grinding product to obtain a first coarse particle product with a particle size greater than 37 μm and a first fine particle product with a particle size less than 37 μm; Step 203, screening the first coarse particle product with a particle size greater than 37 um obtained in step 202 to obtain a first coarse particle product with a particle size greater than 75 um and a first coarse particle product with a particle size of 37 um to 75 um, and the first coarse particle product with a particle size greater than 75 um is returned in sequence; Step 204, screening the crushed ore with a particle size of less than 75 um obtained in step 201 to obtain crushed ore with a particle size of 25 um to 75 um and crushed ore with a particle size of less than 25 um, and performing tailing treatment on the crushed ore with a particle size of less than 25 um; Step 205: feeding the crushed ore with a particle size of 25um to 75um obtained in step 204 into the grinding equipment for a second grinding to obtain a second grinding product, and screening the second grinding product to obtain a second coarse particle product with a particle size of 37um to 75um and a second fine particle product with a particle size less than 37um; Step 206, combining the second coarse-grained product with a particle size of 37um to 75um obtained in step 205 with the first coarse-grained product with a particle size of 37um to 75um obtained in step 203 to obtain a high-silicon ore; combining the second fine-grained product with a particle size of less than 37um obtained in step 205 with the first fine-grained product with a particle size of less than 37um obtained in step 202 to obtain a high-silicon and high-magnesium ore; Step 3: Targeted flotation of the high-silicon and high-magnesium ore and the high-silicon ore, specifically comprising the following steps: Step 301, adding an acidic regulator to the high-silicon and high-magnesium ore obtained in step 206 to obtain an acidic ore pulp; Step 302, adding a demagnesiumizing collector to the acidic slurry obtained in step 301 to perform a demagnesiumizing roughing operation to obtain a demagnesiumizing roughing tailing and a demagnesiumizing roughing concentrate; Step 303, the demagnesiumized rougher tailings obtained in step 302 are subjected to scavenging operation to obtain demagnesiumized tailings, and the medium ore is returned sequentially; Step 304: Mix the de-magnesiumized rougher concentrate obtained in step 302 and the high-silicon raw ore obtained in step 202 to obtain a mixed slurry; add an alkaline regulator to the mixed slurry to obtain a weakly alkaline slurry; Step 305, adding a desiliconization collector to the weakly alkaline slurry obtained in step 304 to perform a desiliconization roughing operation to obtain a desiliconization roughing tailing and a desiliconization roughing concentrate; Step 306, adding a desiliconizing collector and a desiliconizing adjusting agent to the desiliconized rougher concentrate obtained in step 305 again, performing a desiliconizing concentration operation, and obtaining a final concentrate; Step 307: The desiliconized rougher tailings obtained in step 305 are subjected to three sweeping operations to obtain desiliconized tailings, and the intermediate ore is returned in sequence.

2. The precise separation method of high half-high silicon phosphate ore according to claim 1 is characterized in that: The high-half-ounce high-siliceous phosphate ore is a high-siliceous phosphate ore with high-half-ounce oxides; the high-half-ounce oxides specifically refer to: half-ounce oxides with a mass fraction greater than 3.0% in the phosphate ore; the high-siliceous phosphate ore specifically refers to: phosphate ore with a mass fraction of SiO2 greater than 10%; the high-half-ounce high-siliceous phosphate ore includes the following chemical components: P2O5 with a mass fraction of 24.0% to 29.8%, MgO with a mass fraction of 1.0% to 5%, SiO2 with a mass fraction of 10.0% to 30.0%, and half-ounce oxides with a mass fraction of 3.0% to 10.0%.

3. The precise separation method of high half-high silicon phosphate ore according to claim 1 is characterized in that: The screening device used in step 2 is a rotary vibrating screen; the crushing device used in step 201 is a stone roller crusher.

4. The method for accurately separating high-half-high siliceous phosphate ore according to claim 1, characterized in that: The grinding equipment in step 202 and step 205 is one or a combination of high pressure roller mill, rod mill and ball mill.

5. The method for accurately separating high-half-high siliceous phosphate ore according to claim 1, characterized in that: In step 301, the acidic regulator is phosphoric acid and / or sulfuric acid; the molar fraction of the acidic regulator is 10%, and the dosage of the acidic regulator is 4kg to 8kg / t high-silicon and high-magnesium ore.

6. The method for accurately separating high-half-high siliceous phosphate ore according to claim 1, characterized in that: The demagnesium collector in step 302 is a fatty acid anion collector; the dosage of the demagnesium agent is 0.2kg to 0.5kg / t high-silicon and high-magnesium ore.

7. The method for accurately separating high-half-high siliceous phosphate ore according to claim 6, characterized in that: The fatty acid anion collector is oleic acid or cyclohexane acid.

8. The method for accurately separating high-half-high siliceous phosphate ore according to claim 1, characterized in that: In step 304, the alkaline adjusting agent is one or a combination of lime water, sodium carbonate solution and sodium hydroxide solution; the molar fraction of the alkaline adjusting agent is 10%, and the dosage of the alkaline adjusting agent is 0.5kg to 5kg / t high-half-high siliceous phosphate rock.

9. The method for accurately separating high-half-high siliceous phosphate ore according to claim 1, characterized in that: The desiliconizing collectors in step 305 and step 306 are both amine cationic collectors, and the amount of the desiliconizing collector in step 305 is 0.1kg-0.4kg / t of high half-high siliceous phosphate rock, and the amount of the desiliconizing collector in step 306 is 0.05kg-0.3kg / t of high half-high siliceous phosphate rock; the desiliconizing adjusters in step 305 and step 306 are one or more combinations of organic silicon, dimethyl silicone oil and quaternary ammonium salts, and the amount of the desiliconizing adjuster in step 305 is 0.3kg-0.9kg / t of high half-high siliceous phosphate rock, and the amount of the desiliconizing adjuster in step 306 is 0.1kg-0.6kg / t of high half-high siliceous phosphate rock.

10. The method for accurately separating high-half-high siliceous phosphate ore according to claim 9, characterized in that: The amine cationic collector is one of ammonium bromide, ether amine and dodecylamine.

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