Carbonate type high-magnesium phosphorite reverse flotation collecting agent based on daily chemical soap powder and application of carbonate type high-magnesium phosphorite reverse flotation collecting agent

Abstract

The invention relates to a carbonate type high-magnesium phosphorite reverse flotation collecting agent based on daily chemical soap powder and application of the carbonate type high-magnesium phosphorite reverse flotation collecting agent. The collecting agent comprises 70%-90% of daily chemical soap powder and 10%-30% of a surfactant. The content of sodium aliphatate in the daily chemical soap powder is greater than or equal to 80%, and the surfactant is selected from DEP, AES, LAS and the like. During application, the pH value of ore pulp is adjusted to 4.3 + / -0.2, 250g / t of the collecting agent is firstly added for roughing, and then 100g / t of the collecting agent is added for concentration. The industrial-grade daily chemical soap powder is used for phosphorite reverse flotation for the first time, the problem that a traditional collecting agent is unstable in quality is solved through the high purity of the industrial-grade daily chemical soap powder, synergistic interaction is achieved through the compound surfactant, the using amount of the collecting agent is reduced by 20%-35%, meanwhile, the foam stability is optimized, dolomite is efficiently removed, and finally the ore dressing cost is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and in particular to a carbonate-type high-magnesium phosphate ore reverse flotation collector composition based on daily chemical soap powder and an application thereof, which is used for stably removing dolomite impurities. Background Art

[0002] Carbonate-type high-magnesium phosphate ore contains a large amount of dolomite (CaMg(CO3)2) impurities and needs to be de-magnesiumized by reverse flotation. The fatty acid collectors mainly used in the existing technology (such as oleic acid, tall oil, regenerated soap, etc.) have the following defects:

[0003] (1) Quality fluctuation: In order to reduce costs, traditional fatty acid collectors usually use recycled soap or oil waste. The raw material sources are complex, the carbon chain length composition of oil varies greatly, and the sodium content of fatty acids is unstable, resulting in large variations in the flotation effect of different batches of collectors, which affects the quality of phosphate concentrate and the resource utilization rate of phosphate ore.

[0004] (2) Large dosage of reagents: The commercially available phosphate rock reverse flotation collector has a low fatty acid content (about 60%), so the dosage of collector is 500-1200g / t, which is a large amount. Although the unit price of recycled soap is low, the large dosage does not save mineral processing costs.

[0005] (3) Unstable foam: Due to the instability of fatty acid composition, some batches of collectors may produce too much or too little foam, and the foam half-life may fluctuate greatly, which will have a certain impact on production stability.

[0006] Daily chemical soap powder (sodium fatty acid content 85±2%) has stable quality, but has not been used in the field of phosphate rock flotation.

[0007] In recent years, research on phosphate rock flotation agents has mainly focused on changing the molecular structure of fatty acids to make them contain various functional groups or side chains. Although certain results have been achieved, no breakthrough has been made, and no fatty acid with a specific structure has completely replaced traditional collectors.

[0008] Daily chemical soap powder, a soap base made from natural oils and fats, is widely used in the laundry industry. Its main component is sodium C12-C18 fatty acids, and it boasts stable quality and transparent costs. However, its application in phosphate rock reverse flotation has not been reported. Therefore, developing a carbonate-type, high-magnesium phosphate rock reverse flotation collector based on daily chemical soap powder could stabilize the phosphate rock reverse flotation process and reduce costs by reducing collector dosage, thus possessing significant industrial value. Summary of the Invention

[0009] The present invention aims to provide a carbonate-type high-magnesium phosphate ore reverse flotation collector formulation based on daily chemical soap powder and its application. This collector, primarily composed of daily chemical soap powder and combined with a specific surfactant combination, offers the advantages of stable quality, low usage, and high beneficiation efficiency. It effectively removes dolomite, improves collector performance stability, reduces collector usage, and ensures stable phosphate concentrate quality.

[0010] The technical solutions of the present invention are as follows:

[0011] A carbonate-type high-magnesium phosphate ore reverse flotation collector based on daily chemical soap powder, the collector comprising the following components in weight percentage (w / w%):

[0012] Daily chemical soap powder 70%-90%, the daily chemical soap powder is made by saponification of natural oils (such as palm oil), the main component is sodium fatty acid, the sodium fatty acid content is ≥80% (typical value 85±2%), the quality stability is high, and the carbon chain length is C12-C18.

[0013] 10%-30% of surfactant, selected from one or more of diethyl phthalate (DEP), sodium ethoxylated alkyl sulfate (AES), linear sodium dodecylbenzene sulfonate (LAS), sodium α-olefin sulfonate (AOS), glycerol polyoxyethylene ether (G-18), sodium dodecyl diphenyl ether disulfonate, sodium lauryl sulfate (K12), and alkyl polyglycoside (APG).

[0014] The preferred collector formula is (w / w%): 80% daily soap powder, 5% diethyl phthalate, 5% sodium ethoxylated alkyl sulfate, and 10% linear sodium dodecylbenzene sulfonate. The above components are mixed evenly.

[0015] The application method of the collector of the present invention comprises the following steps: in a reverse flotation process of carbonate-type high-magnesium phosphate ore, sulfuric acid or sulfur-phosphorus mixed acid is added to adjust the pH to 4.3±0.2, the collector is added to the ore pulp, the roughing collector dosage is 250 g / t, and the roughing time is 4-6 minutes; sulfuric acid is added as needed to maintain the pH to 4.3±0.2, 100 g / t of the collector is added again for fine separation, the fine separation time is 3-5 minutes, dolomite is removed, and a high-grade phosphate concentrate is obtained.

[0016] The effect achieved by the present invention:

[0017] (1) Innovatively applying daily chemical soap powder to reverse flotation of phosphate rock, taking advantage of its high fatty acid sodium content and quality stability, significantly improving the quality stability of the collector;

[0018] (2) Compared with the traditional sodium fatty acid collector, the collector dosage of the present invention can be reduced by 20-35% (actually it can be reduced from 550g / t to 400g / t, the collector dosage of Sichuan Laoqianshan Phosphate Ore Concentrator is currently 550g / t), which can reduce the mineral processing cost;

[0019] (3) The formula production process is simple. The collector product can be made by mixing the ingredients in a similar way to the washing powder. Alternatively, the soap powder can be dissolved in hot water at about 80°C at the production site, and then a surfactant is added and stirred evenly before diluting with water to a concentration of 1-2%.

[0020] (4) Adding surfactants (such as DEP, LAS, AES) can help improve foam performance and promote the capture efficiency of dolomite. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the two-stage open circuit flotation process in the laboratory of the present invention. DETAILED DESCRIPTION

[0022] Implementation Example 1: Mineral Processing Application

[0023] Collector preparation: Prepare the collector solution according to the following method: 3.2g daily soap powder (85±2% sodium fatty acid content) + 0.2g DEP + 0.2g AES + 0.4g LAS + 396g tap water, heat and stir to prepare a collector solution with a concentration of 1%.

[0024] Experimental materials: Phosphate ore was taken from the overflow port of the classifier of the Sichuan Laoqianshan Phosphate Ore Dressing Plant (carbonate-type high-magnesium phosphate ore, grinding fineness -200 mesh 75%), and the dressing water was taken from the production circulating water of the dressing plant, so that the experimental conditions were highly consistent with the actual production conditions.

[0025] The above examples are specific typical cases, and the collector is applicable to the reverse flotation of carbonate-type high-magnesium phosphate ore.

[0026] The beneficiation data are shown in the table below:

[0027] Table 1. Phosphate ore dressing indicators

[0028]

[0029] The test results in Table 1 demonstrate that a collector formulation based on daily chemical soap powder, at a dosage of 350-400 g / t, can achieve performance comparable to or superior to currently selected commercially available collectors. The greatest advantage of this collector lies in the standardized production process for daily chemical soap powder, which is typically backed by company standards for quality control. This results in a stable and reliable composition and quality, avoiding the high quality fluctuations seen in most commercially available fatty acid soap collectors. Furthermore, after being enhanced with surfactants, this formulation allows for a lower dosage, eliminating the cost increase associated with using high-quality soap powder and, in fact, reducing collector costs.

Claims

1. A carbonate-type high-magnesium phosphate ore reverse flotation collector, characterized in that: It is composed of the following components: Sodium fatty acid soap powder base material: accounting for 70% to 90% of the total weight of the composition. The soap powder base material is a raw material for the daily chemical industry, with a sodium fatty acid content of ≥80% and a carbon chain length of C12-C18; Sodium ethoxylated alkyl sulfate (AES): 1% to 5% by weight of the total composition; Sodium linear dodecylbenzenesulfonate (LAS): 5% to 15% by weight of the total composition; Diethyl phthalate (DEP): 4% to 10% by weight of the total composition; Auxiliary surfactant: 0-5% by weight of the total weight of the composition, selected from one or more of sodium α-olefin sulfonate (AOS), glycerol polyoxyethylene ether (G-18), sodium dodecyl diphenyl ether disulfonate, sodium lauryl sulfate (K12), and alkyl polyglycoside (APG).

2. The collector according to claim 1, wherein: The AES is ethoxylated sodium alkyl sulfate and complies with the quality standard of GB / T 13529-2022.

3. The collector according to claim 1, wherein The weight percentages of each component are: Sodium fatty acid soap powder base 80%; AES 5%; LAS 10%; DEP 5%.

4. The collector according to any one of claims 1 to 3, wherein: When the collector dosage is 350-400g / t ore, the MgO content of the reverse flotation concentrate of carbonate-type high-magnesium phosphate ore can be made ≤1.20%, and the P2O5 recovery rate can be ≥90%.

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