CN-121974358-A - High-purity quartz recycling preparation method based on lithium tailing feldspar powder

CN121974358ACN 121974358 ACN121974358 ACN 121974358ACN-121974358-A

Abstract

The invention discloses a high-purity quartz recycling preparation method based on lithium tailing feldspar powder, which comprises the following steps of carrying out desliming treatment on the lithium tailing feldspar powder to obtain desliming ore pulp, carrying out size mixing treatment on the desliming ore pulp, adding an inhibitor, adding a composite collector and a foaming agent to carry out flotation operation to obtain quartz rough concentrate, carrying out water quenching treatment on the quartz rough concentrate to obtain a water quenching material, placing the water quenching material and a fluorine-free mixed acid system in a high-pressure reaction device to carry out pressure leaching treatment to obtain an acid-leached quartz material, and washing, dehydrating and drying the acid-leached quartz material to obtain a high-purity quartz product.

Inventors

YE MING
ZOU YATING
CHEN RUIXUE
LI LINGLING
WANG XINRONG
PENG QIN
DING SHENGYUAN
ZHU LIANGLIANG
LI QIANG
PENG AIPING
XU TAO
Ao Yuqiang
LIAO YING
MAO WENJING

Assignees

江西赣锋锂业集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20251225

Claims (10)

1. A method for preparing high-purity quartz resources based on lithium tailing feldspar powder is characterized by comprising the following steps: Desliming is carried out on the lithium tailing feldspar powder, and desliming ore pulp is obtained; mixing the desliming ore pulp, adding an inhibitor, and then adding a composite collector and a foaming agent for floatation operation to obtain quartz rough concentrate; calcining the quartz rough concentrate, and then performing water quenching treatment to obtain a water quenching material; Placing the water quenching material and the fluorine-free mixed acid system in a high-pressure reaction device and performing pressure leaching treatment to obtain an acid leached quartz material; And washing, dehydrating and drying the quartz material after acid leaching to obtain a high-purity quartz product.
2. The method for preparing the high-purity quartz resource based on the lithium tailing feldspar powder, which is disclosed in claim 1, is characterized in that the size mixing treatment comprises the following steps: and regulating the desliming ore pulp to a mass concentration of 15% -30% and a pH value of 6.5-10.
3. The method for preparing the lithium tailing feldspar powder-based high-purity quartz resource according to claim 1, wherein the inhibitor is one or more of sodium hexametaphosphate and dextrin, the addition amount of the inhibitor is 800-2500 g/t, the foaming agent is one or more of pine oil, methyl isobutyl carbinol or 3-methyl butanol, the addition amount of the foaming agent is 300-1200 g/t, the composite collector comprises the following components, by mass, 5-10% of polyquaternium-15, 5-10% of octadecylamine, 30-40% of N, N-dimethyl-1, 3-propanediamine, 20-30% of polyoxyethylene monostearate, 12-15% of p-methoxybenzyl alcohol, 1-3% of monochlorononane, 0.5-1% of 2-amino-2-methylpropanenitrile and 2-10% of tri-N-amyl phosphate, and the composite collector is 800-2500 g/t.
4. The method for preparing the high-purity quartz resource based on the lithium tailing feldspar powder, which is disclosed in claim 1, is characterized in that the flotation operation is performed under the condition of pH of 6-8, the stirring speed is 1200-2200 r/min, and the flotation cycle times are 3-8.
5. The method for preparing the high-purity quartz resource based on the lithium tailing feldspar powder, which is disclosed in claim 1, is characterized in that the calcining temperature is 800-1400 ℃, the calcining temperature rising rate is 5-20 ℃ per minute, the calcining time is 1-10 hours, the cooling medium temperature of the water quenching treatment is 0-30 ℃, and the cooling rate of the water quenching treatment is not lower than 50 ℃ per minute.
6. The method for preparing the high-purity quartz resource based on the lithium tailing feldspar powder, which is characterized in that the fluorine-free mixed acid system comprises at least two of hydrochloric acid, nitric acid and sulfuric acid, the mass ratio of the hydrochloric acid to the nitric acid to the sulfuric acid is (0.5-2) 1:1, the mass concentration of the fluorine-free mixed acid system is 10% -30%, the pressure of the pressure leaching treatment is 0.5-3 MPa, the temperature of the pressure leaching treatment is 80-220 ℃, the stirring speed of the pressure leaching treatment is 300-800 r/min, and the treatment time of the pressure leaching treatment is 2-12 hours.
7. The method for preparing high-purity quartz resources based on lithium tailing feldspar powder according to claim 6, wherein the steps of placing the water quenching material and a fluorine-free mixed acid system in a high-pressure reaction device and performing pressure leaching treatment to obtain the quartz materials after acid leaching, wherein the fluorine-free mixed acid system comprises at least two of hydrochloric acid, nitric acid and sulfuric acid and further comprises: adding a leaching aid to the fluorine-free mixed acid system to form a pickling solution; The leaching aid is one or more of ammonium chloride or ammonium sulfate, the mass concentration of the leaching aid is 5% -35%, the liquid-solid mass ratio of the pickling solution to the water quenching material is (3-7): 1, and the mass ratio of the leaching aid to the water quenching material is (0.5-2): 1.
8. The method for preparing the high-purity quartz resource based on the lithium tailing feldspar powder according to claim 1, wherein the steps of calcining the quartz rough concentrate, then performing water quenching treatment to obtain a water quenching material further comprise the steps of recovering heat from a high-temperature cooling medium generated by the water quenching treatment, and recycling the medium after recovering the heat as water for pulp conditioning treatment of the desliming ore pulp.
9. The method for preparing the high-purity quartz resource based on the lithium tailing feldspar powder according to claim 1, wherein the step of placing the water quenching material and the fluorine-free mixed acid system in a high-pressure reaction device and performing pressure leaching treatment to obtain the quartz material after acid leaching further comprises the following steps: In the pressure leaching treatment process, oxygen-containing gas is introduced into the high-pressure reaction device to maintain the oxygen partial pressure in the reaction system at 0.2-0.8 MPa, and meanwhile, an oxidation enhancer is added into the reaction system, wherein the oxidation enhancer is at least one of persulfate or peroxy acid, and the addition amount of the oxidation enhancer is 0.1-1% of the mass of the water quenching material.
10. The method for preparing the high-purity quartz resource based on the lithium tailing feldspar powder according to claim 1, wherein the step of placing the water quenching material and the fluorine-free mixed acid system in a high-pressure reaction device and performing pressure leaching treatment to obtain the quartz material after acid leaching further comprises the following steps: And (3) carrying out solid-liquid separation on the waste acid liquid generated after the pressure leaching treatment, carrying out quality-separating recycling and closed cycle on the separated liquid phase, wherein the first path is directly used as a cooling medium for recycling the step of water quenching treatment, and the second path is returned to the step of pressure leaching treatment for recycling after supplementing the fluorine-free mixed acid system.

Description

High-purity quartz recycling preparation method based on lithium tailing feldspar powder Technical Field The invention relates to the technical field of mineral processing, in particular to a method for preparing high-purity quartz resources based on lithium tailing feldspar powder. Background The traditional quartz purification mainly uses quartz ore as a raw material, and adopts purification methods such as magnetic separation, flotation, acid leaching and the like after the quartz ore is crushed, so that the aim of preparing high-purity quartz is fulfilled. However, the high-purity quartz mineral resources in China are scarce, the resources for producing the high-purity quartz sand are seriously exhausted, and the mineral deposits of the substitute raw materials such as vein quartz are small in scale and unstable in ore quality. Lepidolite is one of the main mineral raw materials for extracting lithium in China, and the lepidolite tailings produced in China per year are over 1200 tons. These tailings are considered as waste or low value fillers, most of which are piled up in tailings ponds, not only occupying land but also present environmental and safety risks. The resource utilization is an important way for promoting the sustainable development of the lepidolite industry. The lepidolite tailings generally contain a large amount of quartz minerals, and can be purified to produce refined quartz sand. If quartz can be economically and efficiently separated and purified from lepidolite tailing feldspar powder, the method not only can realize the recycling utilization of solid waste, but also can open up a low-cost sustainable raw material source for the high-purity quartz industry, and has great economic value and environmental protection significance. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a high-purity quartz recycling preparation method based on lithium tailing feldspar powder, which aims to solve the technical problems in the background art. A method for preparing high-purity quartz resources based on lithium tailing feldspar powder comprises the following steps: Desliming is carried out on the lithium tailing feldspar powder, and desliming ore pulp is obtained; mixing the desliming ore pulp, adding an inhibitor, and then adding a composite collector and a foaming agent for floatation operation to obtain quartz rough concentrate; calcining the quartz rough concentrate, and then performing water quenching treatment to obtain a water quenching material; Placing the water quenching material and the fluorine-free mixed acid system in a high-pressure reaction device and performing pressure leaching treatment to obtain an acid leached quartz material; And washing, dehydrating and drying the quartz material after acid leaching to obtain a high-purity quartz product. The invention has the beneficial effects that: The method uses the bulk industrial solid waste of lepidolite tailing feldspar powder as a raw material, successfully replaces increasingly depleted high-quality pulse quartz ore, opens up a new source of sustainable raw materials with huge reserves and low cost for the high-purity quartz industry, further realizes the high added value recycling of solid waste, has great economic and environmental benefits, creates a synergistic purification effect through the process combination of selective floatation, thermal explosion activation and high-pressure synergistic acid leaching, realizes the efficient separation of quartz, feldspar and mica by a unique composite collector, bursts and activates impurity phases by rapid water quenching after high-temperature calcination, and solves the special problems of complex components and impurity occurrence state of the tailing raw materials by a series of targeted designs, stably prepares the high-purity quartz product with the silicon dioxide content not less than 99.9 percent, has extremely low content of key impurity elements, and realizes the jump-up of low-value tailings to high-end materials. Further, the desliming treatment adopts one or more of screening, hydraulic classification, centrifugal classification or air classification modes. Further, the pulp conditioning treatment specifically comprises the step of conditioning the desliming pulp to a mass concentration of 15% -30% and a pH value of 6.5-10. Further, the inhibitor is one or more of sodium hexametaphosphate and dextrin, the addition amount of the inhibitor is 800-2500 g/t, the foaming agent is one or more of pine oil, methyl isobutyl carbinol or 3-methyl butanol, the addition amount of the foaming agent is 300-1200 g/t, the composite collector comprises, by mass, 5-10% of polyquaternium-15, 5-10% of octadecylamine, 30-40% of N, N-dimethyl-1, 3-propylene diamine, 20-30% of polyoxyethylene monostearate, 12-15% of p-methoxybenzyl alcohol, 1-3% of monochlorononane, 0.5-1% of 2-amino-2-methylpropanenitrile and 2-10% of tri-N-amyl phosphate, and t