阅读说明：本技术 一种80目钾长石湿粉的制备方法 (Preparation method of 80-mesh potassium feldspar wet powder ) 是由 邓培有 于 2020-05-27 设计创作，主要内容包括：本发明公开了一种80目钾长石湿粉的制备方法,包括如下技术步骤：1)钾长石精矿粉的制备；2)第一次球磨处理；3)第一次筛分处理；4)磁选除杂；5)第二次球磨处理、分级；6)第二次磁选除杂；7)分级,过滤,处理后得到80目湿粉。本发明球磨处理时通过添加含丙二醇藻蛋白酸酯的分散剂,不光具有优秀的分散作用,还可以提高钾长石粉的白度,得到的钾长石粉的白度(1200℃)在80-82。(The invention discloses a preparation method of 80-mesh potassium feldspar wet powder, which comprises the following technical steps: 1) preparing potassium feldspar ore concentrate; 2) performing primary ball milling treatment; 3) screening for the first time; 4) removing impurities by magnetic separation; 5) performing ball milling treatment and classification for the second time; 6) removing impurities by magnetic separation for the second time; 7) grading, filtering and treating to obtain wet powder of 80 meshes. The invention adds the dispersant containing propylene glycol alginate protease ester during ball milling treatment, so that the excellent dispersing effect is achieved, the whiteness of the potassium feldspar powder can be improved, and the whiteness (1200 ℃) of the obtained potassium feldspar powder is 80-82.)

1. The preparation method of the 80-mesh potassium feldspar wet powder is characterized by comprising the following technical steps of:

1) preparing potassium feldspar ore concentrate: crushing the excavated potassium feldspar crude ore, performing ore washing treatment through a spiral chute, removing sludge in the crude ore, and dehydrating; sending the raw ore subjected to moisture draining into an ore color sorter, and screening by the ore color sorter to obtain raw ore with whiteness of more than 15%; crushing the raw ore obtained by screening to obtain ore sand crushed to the granularity of less than 1 cm;

2) ball milling treatment for the first time: feeding the ore sand obtained in the previous step into a first ball mill, adding a dispersing agent containing propylene glycol alginate protease ester, finely grinding the ore sand to be more than 50 meshes, and feeding the ore sand into a screening machine, wherein the using amount of the dispersing agent containing the propylene glycol alginate protease ester is 0.3-0.4% of the mass of the grinding material;

3) and (3) screening treatment for the first time: screening ore sand particles with the particle size of more than 50 meshes by a first screening machine, sending the ore sand particles into a desliming cyclone, and removing sludge mixed in the ore sand to obtain ore pulp;

4) magnetic separation and impurity removal: carrying out magnetic separation on the ore pulp obtained in the last step by a vertical ring pulsating high gradient medium magnetic separator to remove iron impurities;

5) ball milling treatment and classification for the second time: fine grinding the mineral powder obtained in the previous step to more than 80 meshes by a second ball mill, adding a dispersing agent containing propylene glycol algae protein acid ester, wherein the using amount of the dispersing agent containing the propylene glycol algae protein acid ester is 0.3-0.4% of the mass of the grinding material, sending the mixture into a second screening machine, screening to obtain mineral powder below 80 meshes, sending the mineral powder to the previous step, screening by the second screening machine to obtain mineral powder above 80 meshes, sending the mineral powder into a grading cyclone to separate and grade the material to obtain high-fineness mineral pulp, and sending the mineral pulp into electromagnetic mineral separation equipment;

6) and (3) magnetic separation and impurity removal for the second time: carrying out magnetic separation on the materials obtained in the previous step by a vertical ring pulsating high gradient medium magnetic separator and an electromagnetic high ladder fine separator to remove iron impurities;

7) grading and filtering: feeding the materials into a cyclone to separate and grade the materials, feeding the materials with the particle size of more than 80 meshes into a disc filter, and treating to obtain wet powder with the particle size of 80 meshes;

the dispersing agent containing propylene glycol alginate protease described in the step 2) and the step 5) comprises the following components in percentage by mass: 30-40% of a composite carrier containing zinc oxide-aluminum oxide and 60-70% of propylene glycol algae protein acid ester; the composite carrier containing zinc oxide and aluminum oxide comprises the following components in mass percentage by mass: the zinc oxide content of the zinc-containing aluminum spinel is 35 percent, the aluminum oxide content is 65 percent, and the specific surface area of the composite carrier is 200-300m²(ii)/g; the dispersant containing propylene glycol alginate is prepared by the following method:

preparing a composite carrier containing zinc oxide and aluminum oxide: carrying out non-constant pH alternate titration on an aluminum-containing soluble salt solution and a zinc-containing solution to prepare a zinc oxide layered material containing zinc aluminate spinel; uniformly mixing zinc oxide containing zinc aluminate spinel and pseudo-boehmite, kneading, molding, drying, and roasting to obtain a zinc oxide-alumina-containing composite carrier;

the zinc oxide laminar material containing the zinc-aluminum spinel is prepared by carrying out non-constant pH alternative titration on an aluminum-containing soluble salt solution and a zinc-containing solution, and is prepared by the following preparation method: dividing the soluble zinc salt solution into 2-4 parts, adding an aluminum-containing mixed solution of sodium metaaluminate and sodium carbonate into one part of the zinc salt solution at the temperature of 60-70 ℃, and stopping dropwise adding the aluminum-containing mixed solution when the pH value reaches 8.5-9.5; then, continuously dropwise adding another part of zinc salt solution; after the zinc salt solution is dripped, continuously dripping the aluminum-containing mixed solution, and stopping dripping the aluminum-containing mixed solution when the pH value reaches 8.5-9.5; alternately titrating the aluminum-containing mixed solution and the zinc salt solution according to the method until the zinc salt solution is completely titrated, finally titrating the aluminum-containing mixed solution for the last time, finishing the alternate titration process of the non-constant pH value when the pH value reaches 8.5-9.5, and controlling the titration process to be finished within 1-6 h; aging at 80-95 deg.C for 4-8h, cooling and washing to neutrality, drying at 80-140 deg.C for 4-10h, and calcining at 550 deg.C for 4-10h to obtain uniformly dispersed zinc oxide layered material containing zinc aluminate spinel;

secondly, uniformly mixing the zinc oxide-aluminum oxide-containing composite carrier and the propylene glycol alginate protease in proportion to obtain the dispersant containing the propylene glycol alginate protease.

2. The preparation method of 80-mesh potassium feldspar wet powder according to claim 1, characterized by comprising the following steps: the first ball milling treatment in the step 2) is carried out, wherein the ball-to-material ratio is 5: 1, initial slurry concentration of 60%.

3. The preparation method of 80-mesh potassium feldspar wet powder according to claim 1, characterized by comprising the following steps: the first screening treatment in the step 3) is to use a cage screen with the specification of phi 1.6X6 m.

4. The preparation method of 80-mesh potassium feldspar wet powder according to claim 1, characterized by comprising the following steps: the vertical ring pulsating high gradient medium magnetic machine in the step 4) has the rated background magnetic induction intensity of 0.4-0.6T and the flow velocity of slurry of 2.5-4.5 cm/s.

5. The preparation method of 80-mesh potassium feldspar wet powder according to claim 1, characterized by comprising the following steps: and 5), performing secondary ball milling treatment, wherein the ball-to-material ratio is 5: 1, initial slurry concentration of 60%.

6. The preparation method of 80-mesh potassium feldspar wet powder according to claim 1, characterized by comprising the following steps: the vertical ring pulsating high gradient medium magnetic machine in the step 6) has the rated background magnetic induction intensity of 1.3-1.8T and the flow velocity of slurry of 2.5-4.5 cm/s.

7. The preparation method of 80-mesh potassium feldspar wet powder according to claim 1, characterized by comprising the following steps: and 7) feeding the materials with the particle size of more than 80 meshes into a disc filter, treating to obtain wet powder with the particle size of 80 meshes, and stacking after conveying by a belt conveyor to obtain the wet powder with the particle size of 80 meshes.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of mineral powder processing, and particularly relates to a preparation method of 80-mesh potassium feldspar wet powder.

[ background of the invention ]

The potassium feldspar is aluminosilicate mineral of alkali metal or alkaline earth metal such as potassium, sodium, calcium, etc., and is also called feldspar mineral. Potassium feldspar (K)₂O-Al₂O₃-6SiO₂) Orthoclase, commonly known as orthoclase, is usually flesh red, white or gray. Potassium feldspar is one of feldspar minerals, is a potassium-containing framework silicate, and is KAlSi₃O₈Three homogeneous multiphase variants ofGeneral names of feldspar, orthoclase and Weixie feldspar. The potassium feldspar series mainly comprises orthoclase, microcline feldspar, diaclase feldspar and aluminosilicate minerals. The potash feldspar has the characteristics of low melting point, long melting interval time, high viscosity of the molten liquid and transparency of a glassy substance formed by melting at high temperature, and is widely applied to the industrial fields of glass and ceramics.

The potassium feldspar powder is used as raw material for glass industry (about 50-60% of total dosage), and 30% of the potassium feldspar powder is used in ceramic industry, and the rest is used in other industries such as chemical industry, glass flux, ceramic blank ingredients, ceramic glaze, enamel raw material, abrasive tool, glass fiber, welding electrode and the like. The potash feldspar powder is used for glass and ceramic, and can also be used for preparing potash fertilizer, and the potash feldspar with better quality is used for manufacturing television display glass shells and the like. The potassium feldspar material is mainly used for ceramic glaze materials and green body materials, and accounts for about 30 percent; the basic material for manufacturing glass accounts for 45-50%, and the high-quality potassium feldspar material has wide requirements in the aspects of manufacturing high-end ceramics, electronic devices and the like, particularly has high temperature resistance and unique antioxidation effect in the aspects of coating large-scale equipment such as ships and wind power equipment, and is a material support which cannot be separated from current and future high-end manufacturing and accurate manufacturing.

At present, in the processing and production of potassium feldspar powder materials in China, the product with the whiteness (1200 ℃) of about 40 percent accounts for more than 70 percent, the product with the whiteness (1200 ℃) of 65-75 percent accounts for less than 20 percent, and few enterprises can produce super-special products with the whiteness (more than or equal to 12 percent), the iron content (less than 0.1 percent) and the whiteness of more than or equal to 80 percent. For example, chinese patent application 201610285488.6 discloses a method for removing impurities and whitening potassium feldspar, which obtains high-grade and high-whiteness potassium feldspar sand powder by carrying out hydrothermal acid washing with sulfuric acid, but the wastewater of the process can cause serious pollution to the environment, the wastewater treatment cost is high, and the production cost of potassium feldspar powder is greatly increased. Therefore, there is a need to develop a process for producing potassium feldspar sand powder with high whiteness and low iron content, and simultaneously reduce or avoid the generation of acidic wastewater. In actual production, the production of high-purity and ultra-white products is opposite to the aspect of the overall deep processing technology, and ultra-white products cannot be produced when high purity is required to be produced. High purity, and the metal substances and other 'harmful substances' in the ore body are required to be removed by deep washing and fine selection; and the deep washing mode cannot be adopted in the process link to keep the proper whiteness of the beneficial components of the minerals.

In actual production, the pulverization of the potash feldspar is generally carried out by adopting dry pulverization and wet pulverization processes, the dry ultrafine pulverization is technically feasible, but the energy consumption is high, the cost is high, and the economic feasibility is realized, while the wet process has the characteristics of low engraving consumption, small product granularity, low production cost and the like, so the existing manufacturers generally adopt wet grinding as the previous wet coarse grinding process.

Therefore, the potassium feldspar wet powder with high purity and super whiteness is produced by researching the essential characteristics of the potassium feldspar mineral, and has good market prospect.

[ summary of the invention ]

Aiming at the problem that a potassium feldspar wet powder product with high purity and super whiteness is lacked in the existing research, the invention provides the preparation method of the 80-mesh potassium feldspar wet powder, and the dispersing agent containing propylene glycol alginate albumin acid ester is added during ball milling treatment, so that the excellent dispersing effect is achieved, the whiteness of potassium feldspar powder can be improved, and the whiteness (1200 ℃) of the obtained potassium feldspar powder is 80-82.

The invention relates to a preparation method of 80-mesh potassium feldspar wet powder, which comprises the following technical steps:

1) preparing potassium feldspar ore concentrate: crushing the excavated potassium feldspar crude ore, performing ore washing treatment through a spiral chute, removing sludge in the crude ore, and dehydrating; sending the raw ore subjected to moisture draining into an ore color sorter, and screening by the ore color sorter to obtain raw ore with whiteness of more than 15%; crushing the raw ore obtained by screening to obtain ore sand crushed to the granularity of less than 1 cm;

2) ball milling treatment for the first time: feeding the ore sand obtained in the previous step into a first ball mill, adding a dispersing agent containing propylene glycol alginate protease ester, finely grinding the ore sand to be more than 50 meshes, and feeding the ore sand into a screening machine, wherein the using amount of the dispersing agent containing the propylene glycol alginate protease ester is 0.3-0.4% of the mass of the grinding material;

3) and (3) screening treatment for the first time: screening ore sand particles with the particle size of more than 50 meshes by a first screening machine, sending the ore sand particles into a desliming cyclone, and removing sludge mixed in the ore sand to obtain ore pulp;

4) magnetic separation and impurity removal: carrying out magnetic separation on the ore pulp obtained in the last step by a vertical ring pulsating high gradient medium magnetic separator to remove iron impurities;

5) ball milling treatment and classification for the second time: fine grinding the mineral powder obtained in the previous step to more than 80 meshes by a second ball mill, adding a dispersing agent containing propylene glycol algae protein acid ester, wherein the using amount of the dispersing agent containing the propylene glycol algae protein acid ester is 0.3-0.4% of the mass of the grinding material, sending the mixture into a second screening machine, screening to obtain mineral powder below 80 meshes, sending the mineral powder to the previous step, screening by the second screening machine to obtain mineral powder above 80 meshes, sending the mineral powder into a grading cyclone to separate and grade the material to obtain high-fineness mineral pulp, and sending the mineral pulp into electromagnetic mineral separation equipment;

6) and (3) magnetic separation and impurity removal for the second time: carrying out magnetic separation on the materials obtained in the previous step by a vertical ring pulsating high gradient medium magnetic separator and an electromagnetic high ladder fine separator to remove iron impurities;

7) grading and filtering: feeding the materials into a cyclone to separate and grade the materials, feeding the materials with the particle size of more than 80 meshes into a disc filter, and treating to obtain wet powder with the particle size of 80 meshes;

the dispersing agent containing propylene glycol alginate protease described in the step 2) and the step 5) comprises the following components in percentage by mass: 30-40% of a composite carrier containing zinc oxide-aluminum oxide and 60-70% of propylene glycol algae protein acid ester; the composite carrier containing zinc oxide and aluminum oxide comprises the following components in mass percentage by mass: the zinc oxide content of the zinc-containing aluminum spinel is 35 percent, the aluminum oxide content is 65 percent, and the specific surface area of the composite carrier is 200-300m²(ii)/g; the dispersant containing propylene glycol alginate is prepared by the following method:

preparing a composite carrier containing zinc oxide and aluminum oxide: carrying out non-constant pH alternate titration on an aluminum-containing soluble salt solution and a zinc-containing solution to prepare a zinc oxide layered material containing zinc aluminate spinel; uniformly mixing zinc oxide containing zinc aluminate spinel and pseudo-boehmite, kneading, molding, drying, and roasting to obtain a zinc oxide-alumina-containing composite carrier;

the zinc oxide laminar material containing the zinc-aluminum spinel is prepared by carrying out non-constant pH alternative titration on an aluminum-containing soluble salt solution and a zinc-containing solution, and is prepared by the following preparation method: dividing the soluble zinc salt solution into 2-4 parts, adding an aluminum-containing mixed solution of sodium metaaluminate and sodium carbonate into one part of the zinc salt solution at the temperature of 60-70 ℃, and stopping dropwise adding the aluminum-containing mixed solution when the pH value reaches 8.5-9.5; then, continuously dropwise adding another part of zinc salt solution; after the zinc salt solution is dripped, continuously dripping the aluminum-containing mixed solution, and stopping dripping the aluminum-containing mixed solution when the pH value reaches 8.5-9.5; alternately titrating the aluminum-containing mixed solution and the zinc salt solution according to the method until the zinc salt solution is completely titrated, finally titrating the aluminum-containing mixed solution for the last time, finishing the alternate titration process of the non-constant pH value when the pH value reaches 8.5-9.5, and controlling the titration process to be finished within 1-6 h; aging at 80-95 deg.C for 4-8h, cooling and washing to neutrality, drying at 80-140 deg.C for 4-10h, and calcining at 550 deg.C for 4-10h to obtain uniformly dispersed zinc oxide layered material containing zinc aluminate spinel;

secondly, uniformly mixing the zinc oxide-aluminum oxide-containing composite carrier and the propylene glycol alginate protease in proportion to obtain the dispersant containing the propylene glycol alginate protease.

In the first ball milling treatment in the step 2), the preferred ball-to-material ratio is 5: 1, initial slurry concentration of 60%.

The first screening treatment in the step 3) is preferably performed by using a cage screen with the specification of phi 1.6X6 m.

The vertical ring pulsating high gradient medium magnetic machine in the step 4) has the rated background magnetic induction intensity of 0.4-0.6T and the flow velocity of slurry of 2.5-4.5 cm/s.

And 5) performing secondary ball milling treatment, wherein the preferred ball-to-material ratio is 5: 1, initial slurry concentration of 60%.

The vertical ring pulsating high gradient medium magnetic machine in the step 6) has the rated background magnetic induction intensity of 1.3-1.8T and the flow velocity of slurry of 2.5-4.5 cm/s.

And 7) feeding the materials with the particle size of more than 80 meshes into a disc filter, treating to obtain wet powder with the particle size of 80 meshes, conveying the wet powder by using a belt conveyor, and stacking to obtain the wet powder with the particle size of 80 meshes, wherein the moisture content of the wet powder is 6-8%.

Compared with the prior art, the invention has the following advantages:

1. in the existing processing process of wet potassium feldspar powder, a dispersing agent is often added in the crushing process, because potassium feldspar is used as a polar inorganic substance, the surface electrostatic field intensity is high, the adsorption and agglomeration among powder particles are serious, and a large amount of nano-scale particles are contained in the slurry obtained by crushing, the dispersing agent is generally added in the crushing process, the commonly used dispersing agent in industrial production comprises sodium hexametaphosphate, ethanol, triethanolamine, sodium polyacrylate and the like, different dispersing agents have different dispersing mechanisms and different effects, but the whiteness is influenced by the addition of the dispersing agent of the above type, and the whiteness (1200 ℃) of the obtained potassium feldspar powder is generally 60-75. The effect of the invention is better than sodium hexametaphosphate, ethanol, triethanolamine and sodium polyacrylate by adding the dispersant containing the propylene glycol alginate protease, and the whiteness (1200 ℃) of the obtained potassium feldspar powder is 80-82 by adding the dispersant containing the propylene glycol alginate protease.

2. The propylene glycol algae protein acid ester used in the ball milling treatment is a gelatinizing agent, is a substance capable of increasing the viscosity of latex and liquid, is commonly used in food, can improve the viscosity of a material system, and enables the material system to keep a uniform and stable suspension state or an emulsion state or form gel, and has an emulsifying effect. Experiments show that the potassium feldspar powder has excellent dispersing effect and can improve the whiteness of the potassium feldspar powder.

3. According to the dispersant containing propylene glycol alginate, the zinc oxide-aluminum oxide composite carrier is added, the aluminum-containing soluble salt solution and the zinc-containing solution are subjected to non-constant pH alternative titration to prepare the zinc oxide layered material containing zinc aluminate spinel, partial micropores on the surface of the composite carrier can be effectively peptized, so that the proportion of the micropores on the surface of the composite carrier is reduced, the proportion of meso-macropores on the surface of the composite carrier is improved, the generation of more active site load centers on the surface of the composite carrier is promoted, and the dispersion efficiency of the propylene glycol alginate is effectively improved.

[ detailed description ] embodiments

The following examples are provided to further illustrate the embodiments of the present invention.