Deep processing and purifying method for fracture dip-dyed quartz sand

Abstract

The invention discloses a deep processing and purifying process method for fracture dip-dyed quartz sand. The deep processing and purifying process method is characterized by comprising the following steps: a, firstly mixing selected sand with an acid medium to carry out a dynamic deep processing and purifying process; b, the purified fine sand is subjected to deacidification and cleaning, and reactants remaining on the surface of the quartz sand are removed; impurity minerals such as suspended matters are removed from the acid liquor through precipitation and activated carbon filtration processes; and c, mixing the quartz sand with an acid solution, and carrying out a static deep processing purification process to remove fracture iron dip dyeing. The method has the advantages that while the static leaching efficiency of the quartz sand is effectively improved, the defects of poor circulation effect, high energy consumption and large medium consumption in the dynamic leaching process of fracture dip dyeing type impurities are overcome, and the production and operation cost can be reduced to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of deep processing of non-metallic minerals, in particular to a deep processing and purification method of fissure-impregnated quartz sand. Background Art

[0002] Quartz sand is a vital non-metallic mineral resource in the national economy, widely used in a wide range of fields, including glass, construction, metallurgy, machinery, semiconductors, fiber optic communications, and the defense industry. Common industrial methods for beneficiating quartz include screening, grading, scrubbing, gravity separation, magnetic separation, and flotation. While these methods can remove most iron-containing minerals, they are difficult to remove the iron oxide film on the quartz surface and the iron impurities within its cracks, requiring the chemical process of "acid treatment."

[0003] Currently, the most widely used acid treatment process involves soaking quartz sand in a reaction tank at a high temperature for a long period of time, allowing the acid to fully react with the quartz sand and remove the iron-containing substances. However, this process requires a static state, resulting in a slow chemical reaction and a very long treatment cycle. This also requires large, numerous reaction tanks, and a large footprint. The Chinese invention patent, "A Dynamic Continuous Deep Purification Apparatus for Pickling" (Publication No. CN219409270U), accelerates the reaction between quartz sand and the acid through dynamic agitation, thereby shortening the treatment cycle. This process is particularly effective for the iron oxide film on the quartz surface. However, the acid cannot directly remove the iron impurities within the quartz cracks, requiring an acid (such as hydrofluoric acid) to react with the quartz to expose the iron impurities within the cracks and then react and remove them. However, dynamic purification is difficult to achieve a complete reaction due to the limited purification time, making it economically feasible. Furthermore, the strong agitation can over-crush fine-grained quartz sand, resulting in a turbid acid solution. This consumes a large amount of acid during acid recycling, increasing production and operating costs. Summary of the Invention

[0004] The purpose of the present invention is to solve the defect of low efficiency in removing iron impurities in quartz cracks in the prior art and to provide a method for deep processing and purification of crack-impregnated quartz sand.

[0005] The technical solution adopted in the present invention is: A method for deep processing and purification of fissure-impregnated quartz sand comprises the following steps: a. Quartz sand purified through existing physical beneficiation processes including crushing, grinding, grading, gravity separation, and magnetic separation is used as the selected sand. The Fe2O3 content of the quartz sand is less than 800ppm, and the particle size of 0.105-0.71mm is greater than 95%. First, the quartz sand is mixed with acid and purified in a dynamic deep processing and purification equipment to remove the iron impurities on the surface of the quartz sand. b. The concentrated sand after dynamic purification is deacidified and cleaned to remove the reactants remaining on the surface of the quartz sand; the acid removed after dynamic purification is clarified and filtered to remove impurities; c. The cleaned quartz sand and the filtered acid solution are then placed in an acid leaching reactor and mixed and subjected to a static deep processing and purification process to remove the iron impregnation in the fissures.

[0006] On the basis of the above technical solutions, there are the following further technical solutions: The dynamic deep processing and purification equipment in step a is a dynamic continuous deep purification equipment for pickling described in Chinese Patent No. 202223532414.8, wherein the acid used is a mixed acid, the slurry concentration is 50%, the reaction temperature is controlled at 60~80°C, the reaction time is controlled at 20~60min, and the stirring speed of the purification equipment is 200~300r / min.

[0007] In step b, the fine sand is deacidified by a belt filter and then cleaned by a sand washer.

[0008] In step b, the acid solution enters a two-stage sedimentation tank for sedimentation and filtration. The first stage of sedimentation is for the fine-grained sand sample produced during the dynamic stirring process, which is discharged to the bottom by its own gravity. An activated carbon filter plate is added to the second stage of sedimentation tank to isolate a small amount of fine impurities floating in the acid solution and absorb part of the acid solution's odor.

[0009] In step c, the cleaned quartz sand and the filtered acid solution are added to an acid leaching reactor for a static leaching reaction to remove iron impurities in the cracks of the quartz sand. The reaction temperature is controlled at 40-60° C. and the reaction time is controlled at 20-60 min.

[0010] The advantages of the present invention are: Effectively solve the problems of low static leaching purification efficiency and large floor space; A series of problems such as fine powder generated during long-term strong stirring in the dynamic purification process hinder the deep removal effect of fissure-impregnated quartz sand. The present invention can avoid consuming excessive acid medium, save economic costs, and have a better circulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a process flow diagram of the present invention. DETAILED DESCRIPTION

[0012] In order to describe the present invention in detail in more detail, the process is described in further detail by taking quartz sand from a certain place in Henan as an example.

[0013] The mineral is quartzite, which is blue-gray in color. The detailed mineral processing and purification process is as follows: The ore samples were crushed, ground, classified and magnetically separated to produce magnetically separated concentrate (Fe2O3 content <800ppm, particle size 0.105~0.71mm>95%). The magnetically separated concentrate and a certain amount of acid medium (the initial medium dosage is 100 kg / t of hydrofluoric acid and oxalic acid, with a hydrofluoric acid / oxalic acid ratio of 2:1) are mixed and reacted in a dynamic continuous deep purification equipment for pickling (publication number CN219409270U), wherein the impeller stirring speed of the purifier is 300 rpm, the purification temperature is 75°C, and the purification time is 30 minutes; The purified fine sand is deacidified using a belt filter and then cleaned in a sand washer. The acid enters the sedimentation tank for initial sedimentation, and after sedimentation is completed, it enters the filter tank and passes through the activated carbon filter plate in the tank to complete the acid filtration. The cleaned concentrated sand and the filtered acid solution enter the static purification machine (acid leaching reactor) for mixed reaction, wherein the reaction temperature is 60°C and the reaction time is 4.0h. The reacted concentrated sand is prepared into finished sand after deacidification and cleaning.

[0014] The results of the concentrated sand after purification by different processes are shown in Table 1.

[0015]

[0016] The dynamic + static combined method has obvious circulation effect compared with the single dynamic method, and the medium consumption can be greatly reduced, which is conducive to saving economic costs; and compared with the single static method, the purification efficiency is significantly improved, which can increase the actual production output and save the land cost of the purification device.

[0017] The above embodiments are only preferred examples of the present invention and do not limit the scope of the present invention. Without departing from the principle of the present invention, all changes in form should fall within the scope of protection of the claims of the present invention.

Claims

1. A method for deep processing and purification of fracture-impregnated quartz sand, characterized in that The following steps are involved: a. Quartz sand purified by existing physical ore separation processes including crushing, grinding, classification, gravity separation and magnetic separation is used as the selected sand. The Fe2O3 content of the quartz sand is less than 800ppm, and the particle size is 0.105~0.71mm>95%. First, the quartz sand is mixed with acid solution and purified in a dynamic deep processing and purification equipment to remove the iron impurities on the surface of the quartz sand; b. The concentrated sand after dynamic purification is deacidified and cleaned to remove the reactants remaining on the surface of the quartz sand; the acid liquid removed after dynamic purification is clarified and filtered to remove impurities; c. The cleaned quartz sand and the filtered acid solution are then placed in an acid leaching reactor for mixing and subjected to a static deep processing and purification process to remove the iron impregnation in the fissures.

2. A method for deep processing and purification of fracture-impregnated quartz sand according to claim 1, characterized in that: The dynamic deep processing and purification equipment in step a is a dynamic continuous deep purification equipment for pickling described in Chinese Patent No. 2022235324148, wherein the acid solution used is a mixed acid, the slurry concentration is 50%, the reaction temperature is controlled at 60~80°C, the reaction time is controlled at 20~60min, and the stirring speed of the purification equipment is 200~300r / min.

3. A method for deep processing and purification of fracture-impregnated quartz sand according to claim 2, characterized in that: In step b, the concentrated sand is deacidified by a belt filter and then cleaned by a sand washer.

4. A method for deep processing and purification of fracture-impregnated quartz sand according to claim 3, characterized in that: In step b, the acid liquid enters a two-stage sedimentation tank for sedimentation and filtration, wherein the first stage of sedimentation is for the fine-grained sand sample produced during the dynamic stirring process, which is discharged from the bottom by its own gravity; an activated carbon filter plate is added to the second stage of the sedimentation tank to isolate a small amount of fine impurities floating in the acid liquid and absorb part of the odor of the acid liquid.

5. A method for deep processing and purification of fracture-impregnated quartz sand according to claim 4, characterized in that: In step c, the cleaned quartz sand and the filtered acid solution are added to an acid leaching reactor for static leaching reaction to remove iron impregnation impurities in the cracks of the quartz sand. The reaction temperature is controlled at 40-60° C. and the reaction time is controlled at 20-60 min.

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