CN112007759A - Double-reverse middling direct flotation method for treating low-magnesium high-iron aluminum silicon calcium collophanite - Google Patents
Double-reverse middling direct flotation method for treating low-magnesium high-iron aluminum silicon calcium collophanite Download PDFInfo
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
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Abstract
The invention relates to a double-reverse middling direct flotation method for treating low-magnesium high-iron aluminum silicon calcium collophanite, belonging to the technical field of mineral separation. The method comprises the steps of carrying out desiliconization, iron removal and aluminum removal reverse flotation under a weakly acidic condition, carrying out demagging reverse flotation on roughing concentrate, and obtaining phosphate concentrate as a product in a cell; and carrying out scavenging once or for many times on the desiliconized and de-ferrated aluminum reverse flotation roughed tailings, wherein the foam product is high-silicon and high-iron aluminum tailings, the product in the tank is desiliconized and de-ferrated aluminum middlings, and carrying out direct flotation operation after the concentration of the ore pulp is improved through dense dehydration equipment, so as to further remove impurities such as silicate, iron and aluminum and the like, and obtain the phosphate concentrate. The process can treat medium and low grade phosphate ore, and obtain phosphate concentrate of different grades through a combined process of double reverse flotation and middling direct flotation, meets the requirement of phosphate ore for processing by different downstream acid methods, simultaneously removes impurities such as magnesium, silicon, iron, aluminum and the like, and has high resource utilization rate.
Description
Technical Field
The invention relates to a phosphorite beneficiation process, in particular to a double-reverse middling direct flotation method for treating low-magnesium high-iron aluminum silicon calcium collophanite.
Background
The phosphorus mineral is used as a non-renewable resource and is a main raw material for producing phosphate fertilizers and phosphorized products. Although the reserves of phosphorite resources in China are relatively rich, most of the phosphorite resources are refractory phosphorite resources with medium and low grade and high content of impurities such as magnesium, silicon, aluminum, iron and the like. After mineral separation and enrichment of the medium-low grade phosphorite, the medium-low grade phosphorite can be used for producing wet-process phosphoric acid with three grades of food grade, industrial grade and fertilizer grade. In the wet-process phosphoric acid production, the MgO content, the content of silicon and acid insoluble substances and the content of iron and aluminum oxides are important indexes in the mineral content evaluation of the wet-process phosphoric acid.
At present, most of the phosphate ores treated by domestic established selection plants are high-magnesium phosphate ores, P2O5The grade is generally above 25 percent, and P can be obtained only by removing carbonate minerals2O5High-quality phosphate concentrate with the content of not less than 32 percent and the content of MgO not more than 0.8 percent, and the ore resources are gradually exhausted. Refractory phosphate rock resources with low magnesium and high content of impurities such as silicon, aluminum, iron and the like are urgently needed to be effectively utilized. For treating the phosphate ore, not only carbonate gangue minerals (mainly dolomite and calcite, and the impurity element is magnesium) and silicate gangue minerals (mainly quartz, chalcedony and the like, and the impurity element is silicon) need to be removed, but also aluminosilicate minerals (mainly clay minerals such as feldspar, mica, kaolin and the like, and the impurity element is aluminum) and iron minerals (mainly limonite, pyrite, magnetite and the like, and the impurity element is iron) need to be removed. At present, a combined flotation method is commonly adopted for enrichment, the main flotation methods are positive and negative flotation and double reverse flotation, wherein silicate and iron and aluminum impurities are removed through the positive flotation or the reverse flotation, dolomite is removed, magnesium is mainly selected through the reverse flotation, and a great deal of research is carried out on the collophanite by a mineral separation worker.
The Liutao of Wuhan university of science and technology and the like perform process mineralogy research and flotation method research (Wangbo, Liutao, Zhang Yimin, Liuxin, Sun Kun, Hubei and certain collophanite flotation deferrization, aluminum and magnesium tests [ J]Metal mine, 2016 (7): 136-2O523.98% of MgO, 2.11% of R2O3（Fe2O3+ Al2O3) 6.40 percent, and the P is obtained by the treatment of 2 times of direct flotation and 1 time of reverse flotation2O5Grade of 32.98%, recovery rate of 92.30%, R2O3The phosphate concentrate with the content of 2.94 percent, the removal rate of 69.17 percent, the MgO content of 1.02 percent and the removal rate of 67.54 percent accords with the acid processingAnd 4, the quality standard of the phosphate ore is high.
Chinese published patent document CN101829634B discloses a flotation method of high-iron-aluminum low-grade phosphate ore, which grinds the phosphate ore raw ore to-400 meshes more than or equal to 90 percent, and carries out once roughing and three times of fine selection, and water glass and naphthalene sulfonated condensation compound are added during fine selection. It can be used for separating low-grade phosphorus ore with high iron and aluminum content and fine disseminated granularity to obtain phosphorus concentrate P2O5Grade greater than 35% and Fe2O3+ Al2O3The content is less than 3.5 percent.
In the above publications, the direct flotation is a high-efficiency mineral separation process for removing silicate and iron-aluminium impurities, and the content of dolomite in the phosphate ore is not low, and a magnesium separation flotation section is also required. The backwater utilization difficulty is large due to the alkaline condition of the forward flotation and the acidic condition of the reverse flotation. Although some researchers have conducted some researches on reverse water return, for example, CN103880135B discloses a method for treating waste water from direct flotation of phosphorite, in which phosphoric acid is used as a reverse flotation regulator, and excess waste water in the process is treated with lime in one step, and then returned to the direct flotation system for recycling. However, there is no successful industrial application case at present. In addition, the particle size of the feed material for forward and reverse flotation is fine, the content of-200 meshes is often more than or equal to 90%, the using amount of a collecting agent for forward flotation is large, and the operation cost is high particularly in the low-temperature period in winter.
The Beijing mining and metallurgy research institute Lisong Qing and the like adopts double reverse flotation to carry out quality improvement and impurity reduction test research on certain high-magnesium high-aluminum collophanite in Guizhou. (Lipinqing, Sunhao, Zhenggui soldier, Zhuyang ge, Huxiaxing, a double reverse flotation impurity-reducing test of certain high-magnesium high-alumina collophanite in Guizhou [ J]Mining metallurgy, 2016, 25 (1): 1-9) crude ore P2O521.16%, MgO 5.55%, R2O34.67 percent of P can be obtained through two-stage ore grinding-double reverse flotation-grading closed-loop test process2O5Grade 33.97%, R2O3（Fe2O3+ Al2O3) The sum of 2.23 percent, the MgO content of 0.73 percent and P2O5The recovery rate of the phosphate concentrate is 73.71 percent.
Chinese published patent document CN102716806B discloses a method for simultaneously removing magnesium oxide, iron oxide and aluminum oxide sesquioxide in middle-low grade phosphate ore by a double reverse flotation method, grinding the phosphate ore raw ore to-200 meshes which is more than or equal to 85%, and adding an inhibitor and a collecting agent to respectively remove magnesium, iron oxide and aluminum oxide by three-stage reverse flotation. The invention can simultaneously remove the contents of magnesium oxide, ferric oxide and aluminum oxide in the concentrate, and obviously improve the quality of the phosphate concentrate. The production cost in the subsequent acid making process can be reduced.
Chinese published patent document CN105689149A discloses a double reverse flotation method suitable for silico-calcic phosphorite, which comprises, first, conducting flotation and desilication in neutral medium, desilication tailings are subjected to 2 times of desilication and recleaning, desilication middlings do not return, desilication middlings and desilication rough concentrates are combined and then are subjected to flotation and demagging, foam products are demagging tailings, and products in a cell are phosphate concentrates.
In the above publication, the double reverse flotation can remove impurities such as magnesium oxide, silicate and iron and aluminum, but in the actual flotation, the removal efficiency of iron and aluminum impurities is low, the separation performance of the collecting agent is not high, the foam fluidity is poor, and the iron and aluminum impurities in the desiliconized and iron and aluminum-removed scavenging are high, so that the iron and aluminum impurities in the final phosphate concentrate are also high. Because the scavenging middlings often contain more continuous minerals, part of researchers at present carry out regrinding or desliming and screening treatment on the scavenging middlings, and the actual beneficiation finds that the regrinding of the middlings generates a large amount of difficultly-selected fine mud, so that the desliming and screening operation has high yield, poor and unstable effect. At present, the quality of raw phosphate ore is increasingly poor, and the requirement of downstream industries on phosphate concentrate products is increasingly high, the combined ore dressing process for producing multi-grade phosphate concentrate gradually becomes a trend.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a double-reverse middling direct flotation method which can produce multi-grade phosphate concentrate by using medium-low grade phosphate ores, reduce the fineness of a flotation feed, effectively utilize return water and efficiently remove magnesium, silicon and iron and aluminum.
The technical problem to be solved by the present invention can be achieved by the following technical means. The invention relates to a double-reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcium collophanite, which is characterized by comprising the following steps of: the method takes low-magnesium high-iron aluminum collophanite as raw ore, and enters a reverse flotation desilication de-ironing aluminum system for desilication de-ironing aluminum roughing under the weak acid condition after crushing, grinding and pulp mixing; performing reverse flotation magnesium removal operation after pulp mixing of products in the roughing tank to obtain reverse flotation phosphate concentrate; and (3) carrying out scavenging operation on the flotation foam obtained by the desiliconization and deferrization aluminum roughing operation, and carrying out middling direct flotation operation after the middling is scavenged and size-adjusted to obtain direct flotation phosphate concentrate.
The invention relates to a double-reverse middling direct flotation method for treating low-magnesium high-iron aluminum silicon calcium collophanite, which further adopts the preferable technical scheme that the steps are as follows:
(1) crushing and grinding low-magnesium high-iron aluminum collophanite to required fineness, adding water, mixing the pulp to 20-40% of pulp concentration, adding inorganic acid as a pH value regulator, an inhibitor and a reverse flotation desilication and deferrization aluminum collecting agent into the pulp, mixing the pulp, and feeding the mixed material into a reverse flotation desilication and deferrization aluminum system to perform desilication and deferrization aluminum roughing operation; transferring the product in the roughing tank to a reverse flotation demagging tank, adding a pH value regulator and a demagging collector into the reverse flotation demagging tank respectively, carrying out reverse flotation demagging operation after size mixing, wherein the foam product is magnesium-dressing tailings, and the product in the tank is reverse flotation phosphate concentrate;
(2) and carrying out scavenging operation once or for multiple times on flotation foam obtained in the desiliconization and deferrization aluminum roughing operation, wherein the scavenging foam is high-silicon high-iron aluminum tailings, conveying scavenged middlings to a direct flotation tank through concentration equipment, then respectively adding regulator water glass and inorganic base into the pulp, then adding a direct flotation collecting agent for size mixing, then carrying out operation of a direct flotation system, and obtaining a direct flotation foam product, namely direct flotation phosphate concentrate.
The double-reverse middling direct flotation method for treating the low-magnesium high-iron aluminum silicon calcium collophanite further preferably adopts the technical scheme that:
1. and feeding the final foam product into a first tailing thickener in the desiliconization and deironization reverse flotation scavenging operation, returning overflow water of the first tailing thickener to the desiliconization and deironization roughing operation, and taking the scavenging operation as additional water or flushing water.
2. And feeding the product in the reverse flotation demagging operation tank into a first concentrate thickener, pumping the magnesium-selecting foam into a second tailing thickener, and returning the overflow water of the first concentrate thickener and the overflow water of the second tailing thickener to the desiliconization and deferrization aluminum reverse flotation system operation or the demagging reverse flotation operation as supplementing water or flushing water.
3. The desiliconized and deferrized aluminum scavenging middling is concentrated by a concentration device, and overflow water can return to a desiliconized and deferrized aluminum reverse flotation system for operation or a demagging reverse flotation operation to be used as additional water or washing water.
4. The direct flotation phosphate concentrate is filtered to the water content of below 10% by adopting a filter for the middling direct flotation foam product, the ferrosilicon aluminum tailings in the product in the tank are also filtered to the water content of below 20% by adopting the filter, all filtrate is recycled to a sedimentation tank, and the supernatant can be returned to the middling direct flotation operation or returned to the desiliconization and iron removal aluminum reverse flotation roughing operation in a certain proportion or returned to the filter as washing water.
5. The pH value regulator is preferably sulfuric acid, phosphoric acid or a mixture of the two. The pH adjuster is used to adjust the pH to a weakly acidic condition of 5.5 to 6.5, preferably 6.0.
6. The flotation feed particle size composition (by weight) is preferably below 75% in the-200 mesh fraction.
7. The reverse flotation desiliconization de-ferrated aluminum collecting agent is added with chemicals once or in batches.
8. The reverse flotation desilication de-iron aluminum scavenging operation can select no or supplement of a small amount of inhibitor.
9. The concentration of the middling direct flotation pulp is preferably 25-40%.
10. The operation of the middling positive flotation system is only roughing operation or consists of roughing, scavenging and concentrating operation.
In the method, the reverse flotation phosphate concentrate and the forward flotation phosphate concentrate can be used as phosphate concentrates with different grades for downstream use or combined into comprehensive concentrate. The flotation reagent used in the present invention may be any one commonly used in the art, unless otherwise specified.
In the method of the invention, the raw ore of the low-magnesium high-iron aluminum-silicon-calcium collophanite generally comprises the following components: p2O5Grade is16-25%, MgO content less than or equal to 2%, R2O3 (Fe2O3+ Al2O3 ) 4 to 8 percent. Carrying out desiliconization, iron and aluminum removal and magnesium removal two-stage reverse flotation operation under the weak acid condition to obtain reverse flotation phosphate concentrate: p2O5≥32%，MgO≤0.8%，Fe2O3+ Al2O3Less than or equal to 2.0 percent; the middling direct flotation method obtains direct flotation phosphate concentrate: p2O5≥28%，MgO≤1.5%，Fe2O3+ Al2O3≤3.0%。
Compared with the prior art, the method has the main advantages that:
(1) the requirement on the composition of the feed granularity of the flotation operation is not high (generally, the granularity of-200 meshes by weight is less than 75 percent), multi-stage ore grinding or screening operation is not needed, impurities such as magnesium, silicon, iron, aluminum and the like are removed, and middle-low grade phosphorite (composition: P) is enriched2O5 16~25%，MgO≤2%，Fe2O3+ Al2O3 4-8 percent), obtaining phosphate concentrates with different grades by a combined process of double reverse flotation and middling direct flotation, meeting the requirements of phosphate ores for processing by different downstream acid methods, and having high resource utilization rate;
(2) most of the flotation process water is acidic water and can be recycled in a double-reverse flotation system, although the process water of a middling direct flotation system is alkalescent, the process water occupies a small proportion after concentration and can be recycled in an internal system of the direct flotation or partially returned to a desiliconization and deferrization flotation section for use.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
Specific technical embodiments of the present invention are further described below with reference to examples, but not to be construed as being limited by the claims.
Example 1 referring to fig. 1, a double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite specifically comprises the following steps:
(1) low-magnesium high-iron aluminium collophanite (main composition: P)2O5 24.3%，MgO 1.3%，Fe2O3+ Al2O3 6.2%) crushing and grinding until the grain size is 55% of-0.074 mm, adding water for size mixing until the pulp density is 28%, respectively adding 2Kg/t of a mixture of sulfuric acid and phosphoric acid serving as a pH value regulator into the pulp, and 0.6Kg/t of a reverse flotation desilication and deferrization aluminum amine cation collector into the pulp, performing size mixing, and feeding the material subjected to size mixing into a reverse flotation desilication and deferrization aluminum system for desilication and deferrization aluminum roughing operation; transferring the product in the roughing tank to a reverse flotation demagging stirring tank, respectively adding 10Kg/t of mixture of sulfuric acid and phosphoric acid as pH value regulator and 0.6Kg/t of fatty acid soap as demagging collector, performing reverse flotation demagging after pulp mixing, wherein the final foam product is magnesium-selecting tailings, and the product in the tank is high-quality phosphate concentrate 1 (main composition: P)2O5 33.6%，MgO 0.6%，Fe2O3+ Al2O3 1.8%）；
(2) The flotation foam obtained by the desiliconization and iron and aluminum removal roughing operation is subjected to scavenging for three times, the scavenging final foam is high-silicon high-iron and aluminum tailings, the three middlings are scavenged and combined and conveyed to a direct flotation tank through concentration equipment, then regulators of water glass 5Kg/t and sodium carbonate 3Kg/t are respectively added into the pulp, then a direct flotation collector of fatty acid soap 2Kg/t is added for size mixing, then the direct flotation primary roughing operation is performed, and the direct flotation foam product is high-quality phosphate concentrate 2 (mainly comprising P)2O5 28.5%，MgO 1.4%，Fe2O3+ Al2O3 2.95%）；
(3) The process water can be recycled by adopting the following modes:
a. and (3) feeding the final foam product into a tailing thickener 1 in the reverse flotation scavenging operation of the silicon-iron-aluminum removal, and returning overflow water of the tailing thickener 1 to the rough concentration operation of the silicon-iron-aluminum removal as flushing water.
b. Feeding the phosphorus concentrate 1 in the flotation and demagging operation tank into a concentrate thickener 1, pumping the magnesium-selecting foam into a tailing thickener 2, and returning part of the overflow water of the concentrate thickener 1 to desilication and deferrization aluminum reverse flotation roughing operation as additional water and returning part of the overflow water to desilication and deferrization aluminum scavenging operation as washing water; the overflow water of the tailing thickener 2 returns to the operation of reverse flotation and roughing of the selected magnesium and is used as supplementary water.
c. Concentrating the desiliconized and deferrized aluminum scavenging middling by a concentration device, and returning overflow water to a magnesium-selecting reverse flotation system to operate as supplementary water.
d. And (3) filtering the phosphate concentrate 2 to the water content of below 10% by adopting a filter for the middling positive flotation foam product, filtering the ferrosilicon aluminum tailings 2 in the tank product to the water content of below 20% by adopting the filter, recovering all filtrate to a sedimentation tank, and returning supernatant to the middling positive flotation operation.
Embodiment 2, referring to fig. 1, a double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite specifically comprises the following steps:
(1) low-magnesium high-iron aluminium collophanite (main composition: P)2O5 22.5%，MgO 1.2%，Fe2O3+ Al2O3 6.9%) of the slurry, grinding the ore until the ore is broken and the ore is-0.074 mm and accounts for 70%, adding water for size mixing until the concentration of the ore pulp is 30%, respectively adding 1.5Kg/t of a mixture of sulfuric acid and phosphoric acid serving as a pH value regulator into the ore pulp, and 0.7Kg/t of a reverse flotation desilication and iron removal amine cation collecting agent into the ore pulp for size mixing, and feeding the material after size mixing into a reverse flotation desilication and iron removal aluminum removal system for desilication and iron removal roughing operation; transferring the product in the roughing tank to a reverse flotation demagging stirring tank, respectively adding 10Kg/t of mixture of sulfuric acid and phosphoric acid as pH value regulator and 0.6Kg/t of fatty acid soap as demagging collector, performing reverse flotation demagging after pulp mixing, wherein the final foam product is magnesium-selecting tailings, and the product in the tank is high-quality phosphate concentrate 1 (main composition: P)2O5 33.1%，MgO 0.52%，Fe2O3+ Al2O3 1.95%）；
(2) The flotation foam obtained by the desiliconization and iron and aluminum removal roughing operation is subjected to scavenging for three times, the scavenging final foam is high-silicon high-iron and aluminum tailings, the three middlings are scavenged and combined and conveyed to a direct flotation tank through concentration equipment, then regulators of water glass 5Kg/t and sodium carbonate 3Kg/t are respectively added into the pulp, then a direct flotation collector of fatty acid soap 2Kg/t is added for size mixing, then the direct flotation primary roughing operation is performed, and the direct flotation foam product is high-quality phosphate concentrate 2 (mainly comprising P)2O5 29%，MgO 1.32%，Fe2O3+ Al2O3 2.6%）；
(3) The process water can be recycled by adopting the following modes:
a. and (3) feeding the final foam product into a tailing thickener 1 in the reverse flotation scavenging operation of the silicon-iron-aluminum removal, and returning overflow water of the tailing thickener 1 to the rough concentration operation of the silicon-iron-aluminum removal as flushing water.
b. Feeding the phosphorus concentrate 1 in the flotation and demagging operation tank into a concentrate thickener 1, pumping the magnesium-selecting foam into a tailing thickener 2, and returning part of the overflow water of the concentrate thickener 1 to desilication and deferrization aluminum reverse flotation roughing operation as additional water and returning part of the overflow water to desilication and deferrization aluminum scavenging operation as washing water; the overflow water of the tailing thickener 2 returns to the operation of reverse flotation and roughing of the selected magnesium and is used as supplementary water.
c. Concentrating the desiliconized and deferrized aluminum scavenging middling by a concentration device, and returning overflow water to a magnesium-selecting reverse flotation system to operate as supplementary water.
d. And (3) filtering the phosphate concentrate 2 to the water content of below 10% by adopting a filter for the middling positive flotation foam product, filtering the ferrosilicon aluminum tailings 2 in the tank product to the water content of below 20% by adopting the filter, recovering all filtrate to a sedimentation tank, and returning supernatant to the middling positive flotation operation.
Example 3 referring to fig. 1, a double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite specifically comprises the following steps:
(1) low-magnesium high-iron aluminium collophanite (main composition: P)2O5 22.5%，MgO 1.2%，Fe2O3+ Al2O3 6.9%) of the slurry, grinding the ore until the ore is broken and the ore is-0.074 mm and accounts for 70%, adding water for size mixing until the concentration of the ore pulp is 30%, respectively adding 1.5Kg/t of a mixture of sulfuric acid and phosphoric acid serving as a pH value regulator into the ore pulp, and 0.7Kg/t of a reverse flotation desilication and iron removal amine cation collecting agent into the ore pulp for size mixing, and feeding the material after size mixing into a reverse flotation desilication and iron removal aluminum removal system for desilication and iron removal roughing operation; transferring the product in the roughing tank to a reverse flotation demagging stirring tank, respectively adding 10Kg/t of mixture of sulfuric acid and phosphoric acid as pH value regulator and 0.6Kg/t of fatty acid soap as demagging collector, performing reverse flotation demagging after pulp mixing, wherein the final foam product is magnesium-selecting tailings, and the product in the tank is high-quality phosphate concentrate1 (main component: P)2O5 33.1%，MgO 0.52%，Fe2O3+ Al2O3 1.95%）；
(2) The flotation foam obtained by the desiliconization and iron and aluminum removal roughing operation is subjected to scavenging again, the scavenging final foam is high-silicon high-iron and aluminum tailings, the scavenged middlings are conveyed to a direct flotation tank through concentration equipment, then regulators of water glass 4Kg/t and sodium carbonate 2Kg/t are respectively added into the pulp, then 2.5Kg/t of direct flotation collector fatty acid soap is added for size mixing, then the direct flotation primary roughing operation is performed, and the direct flotation foam product is high-quality phosphate concentrate 2 (mainly comprising P, C, P2O5 28%，MgO 1.2%，Fe2O3+ Al2O3 2.98%）；
(3) The process water can be recycled in the same manner as in example 1.
Example 4 referring to fig. 1, a double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite specifically includes the following steps:
(1) low-magnesium high-iron aluminium collophanite (main composition: P)2O5 22.5%，MgO 1.2%，Fe2O3+ Al2O3 6.9%) of the slurry is crushed and ground until the particle size is-0.074 mm and accounts for 70%, water is added for size mixing until the concentration of the slurry is 30%, 1.5Kg/t of a mixture of sulfuric acid and phosphoric acid serving as a pH value regulator is added into the slurry, 0.7Kg/t of a reverse flotation desilication and iron-removal amine cation collector and 0.5 Kg/t of a high molecular weight organic inhibitor are added into the slurry for size mixing, and the material after size mixing enters a reverse flotation desilication and iron-removal system for desilication and iron-removal roughing operation; transferring the product in the roughing tank to a reverse flotation demagging stirring tank, respectively adding 10Kg/t of mixture of sulfuric acid and phosphoric acid as pH value regulator and 0.6Kg/t of fatty acid soap as demagging collector, performing reverse flotation demagging after pulp mixing, wherein the final foam product is magnesium-selecting tailings, and the product in the tank is high-quality phosphate concentrate 1 (main composition: P)2O5 34%，MgO 0.45%，Fe2O3+ Al2O31.56%）；
(2) The flotation foam obtained by the desiliconization and iron-removing aluminum roughing operation is subjected to secondary scavenging operation, and the scavenging operation is finally carried outThe foam is high-silicon high-iron aluminum tailings, scavenging middlings are conveyed to a direct flotation tank through concentration equipment, then regulators of sodium silicate 3Kg/t and sodium carbonate 2Kg/t are respectively added into ore pulp, then 3.0Kg/t of direct flotation collector fatty acid soap is added for size mixing, then the direct flotation primary roughing operation is carried out, and the direct flotation foam product is high-quality phosphate concentrate 2 (mainly comprising P)2O5 29%，MgO 1.1%，Fe2O3+ Al2O3 2.63%）。
Example 5 referring to fig. 1, a double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite specifically comprises the following steps:
(1) low-magnesium high-iron aluminium collophanite (main composition: P)2O5 18.3%，MgO 1.5%，Fe2O3+Al2O3 7%) crushing and grinding until the grain size is-0.074 mm and the grain size accounts for 65%, adding water for size mixing until the ore pulp concentration is 30%, respectively adding 1.5Kg/t of phosphoric acid serving as a pH value regulator, 0.7Kg/t of a reverse flotation desilication and deferrization aluminum amine cation collector and 0.5 Kg/t of a high molecular weight organic inhibitor into the ore pulp for size mixing, and feeding the materials subjected to size mixing into a reverse flotation desilication and deferrization aluminum system for desilication and deferrization aluminum roughing operation; transferring the product in the roughing tank to a reverse flotation demagging stirring tank, respectively adding 10Kg/t of mixture of sulfuric acid and phosphoric acid as pH value regulator and 0.6Kg/t of fatty acid soap as demagging collector, performing reverse flotation demagging after pulp mixing, wherein the final foam product is magnesium-selecting tailings, and the product in the tank is high-quality phosphate concentrate 1 (main composition: P)2O5 32.1%，MgO 0.6%，Fe2O3+ Al2O3 1.96%）；
(2) The flotation foam obtained by the desiliconization and iron and aluminum removal roughing operation is subjected to secondary scavenging operation, the scavenging final foam is high-silicon high-iron and aluminum tailings, scavenged middlings are conveyed to a direct flotation tank through concentration equipment, then regulators of water glass 3Kg/t and sodium carbonate 2Kg/t are respectively added into ore pulp, then a direct flotation collector of fatty acid soap 3.0Kg/t is added for size mixing, then the direct flotation primary roughing operation is performed, and the direct flotation foam product is high-quality phosphate concentrate 2 (mainly comprising P, C, P2O5 28%，MgO 1.1%，Fe2O3+ Al2O3 2.93%）；
(3) The process water recycling can be carried out in the manner described in example 1.
Claims (10)
1. A double-reverse middling direct flotation method for treating low-magnesium high-iron aluminum silicon calcium collophanite is characterized by comprising the following steps: the method takes low-magnesium high-iron aluminum collophanite as raw ore, and the raw ore is crushed, ground, mixed with pulp and then enters a reverse flotation desilication and iron and aluminum removal system to carry out desilication and iron and aluminum removal roughing operation under the weak acid condition; performing reverse flotation magnesium removal operation after pulp mixing of products in the roughing tank to obtain reverse flotation phosphate concentrate; and (3) carrying out scavenging operation on the flotation foam obtained by the desiliconization and deferrization aluminum roughing operation, and carrying out middling direct flotation operation after the middling is scavenged and size-adjusted to obtain direct flotation phosphate concentrate.
2. The double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite according to claim 1, characterized by comprising the following steps:
(1) crushing and grinding low-magnesium high-iron aluminum collophanite to required fineness, adding water, mixing the pulp to 20-40% of pulp concentration, adding inorganic acid as a pH value regulator, an inhibitor and a reverse flotation desilication and deferrization aluminum collecting agent into the pulp, mixing the pulp, and feeding the mixed material into a reverse flotation desilication and deferrization aluminum system to perform desilication and deferrization aluminum roughing operation; transferring the product in the roughing tank to a reverse flotation demagging tank, adding a pH value regulator and a demagging collector into the reverse flotation demagging tank respectively, carrying out reverse flotation demagging operation after size mixing, wherein the foam product is magnesium-dressing tailings, and the product in the tank is reverse flotation phosphate concentrate;
(2) and carrying out scavenging operation once or for multiple times on flotation foam obtained in the desiliconization and deferrization aluminum roughing operation, wherein the scavenging foam is high-silicon high-iron aluminum tailings, conveying scavenged middlings to a direct flotation tank through concentration equipment, then respectively adding regulator water glass and inorganic base into the pulp, then adding a direct flotation collecting agent for size mixing, then carrying out operation of a direct flotation system, and obtaining a direct flotation foam product, namely direct flotation phosphate concentrate.
3. The double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite according to claim 2, characterized in that: and feeding the final foam product into a first tailing thickener in the desiliconization and deironization reverse flotation scavenging operation, returning overflow water of the first tailing thickener to the desiliconization and deironization roughing operation, and taking the scavenging operation as additional water or flushing water.
4. The double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite according to claim 2, characterized in that: and feeding the product in the reverse flotation demagging operation tank into a first concentrate thickener, pumping the magnesium-selecting foam into a second tailing thickener, and returning the overflow water of the first concentrate thickener and the overflow water of the second tailing thickener to the desiliconization and deferrization aluminum reverse flotation system operation or the demagging reverse flotation operation as supplementing water or flushing water.
5. The double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite according to claim 2, characterized in that: the desiliconized and deferrized aluminum scavenging middling is concentrated by a concentration device, and overflow water can return to a desiliconized and deferrized aluminum reverse flotation system for operation or a demagging reverse flotation operation to be used as additional water or washing water.
6. The double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite according to claim 2, characterized in that: the direct flotation phosphate concentrate is filtered to the water content of below 10% by adopting a filter for the middling direct flotation foam product, the ferrosilicon aluminum tailings in the product in the tank are also filtered to the water content of below 20% by adopting the filter, all filtrate is recycled to a sedimentation tank, and the supernatant can be returned to the middling direct flotation operation or returned to the desiliconization and iron removal aluminum reverse flotation roughing operation in a certain proportion or returned to the filter as washing water.
7. The double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite according to claim 2, characterized in that: the pH value regulator is inorganic acid selected from sulfuric acid, phosphoric acid or a mixture of the sulfuric acid and the phosphoric acid, and the pH value regulator is used for size mixing until the pH value is in a weak acidic condition of 5.5-6.5.
8. The double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite according to claim 1 or 2, characterized by comprising the following steps: the feed material for the flotation operation has a particle size composition of-200 mesh size below 75% by weight.
9. The double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite according to claim 1 or 2, characterized by comprising the following steps: the concentration of the middling direct flotation pulp is 25-40%.
10. The double reverse middling direct flotation method for treating low-magnesium high-iron aluminosilico-calcic collophanite according to claim 1 or 2, characterized by comprising the following steps: the middling direct flotation operation is only roughing operation or consists of roughing, scavenging and concentrating operation.
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| CN114682387A (en) * | 2020-12-30 | 2022-07-01 | 中蓝连海设计研究院有限公司 | Phosphorite double-reverse flotation method |
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