CN116947461A - A wear-resistant ceramic grinding ball with high iron content - Google Patents

Abstract

The invention discloses a wear-resistant ceramic grinding ball with high iron content, which includes the following raw materials in mass percentage: bauxite 5~15%, iron oxide 20~60%, γ~alumina 20~65%, silicon oxide 1~5 %, zirconium oxide 1~10%, zinc oxide 0.5~5%, chromium oxide 0.1~0.5%, cerium oxide 0.2~3%, feldspar 1~5%, talc 1~3%, calcium carbonate 0.5~3%, Barium carbonate 0.2~2%. The invention not only solves the problem of low-cost production of high-specific-gravity ceramic grinding balls, but also solves the problem of reduced wear resistance, strength and hardness of ceramic materials caused by large amounts of iron oxide, and also solves the problem of converting iron oxide into The problem of AB2X4, a spinel mineral with higher hardness.

Description

A wear-resistant ceramic grinding ball with high iron content

Technical field

The present invention relates to the field of grinding balls, and in particular to a high-iron content wear-resistant ceramic grinding ball and a preparation method thereof.

Background technique

The density of non-metallic materials is much smaller than that of steel, iron, copper, lead, gold and other metal materials. The density of the produced ceramic grinding balls is often between 2.6 and 6.0, which also makes the ceramic grinding balls ideal for crushing and grinding metal ores. The grinding efficiency in is relatively low. Increasing the density of the grinding balls as much as possible is an effective method to improve the grinding efficiency of the grinding balls. However, the inorganic non-metallic materials commonly used in the preparation of traditional ceramic materials have the highest specific gravity of zirconia and its compounds, but their high prices limit their applications.

There is a long way to go to find suitable alternative high-specific gravity raw materials and apply them to the preparation of ceramic materials to broaden the types of ceramic raw materials.

Iron oxide is a material with a high specific gravity (5.1~5.2g/cm³). It is commonly used in ceramic glazes as color development, fluxing and crystallization agents. At the same time, we often come into contact with ceramic products with high iron content. There are black pottery, purple clay pots, magnetic health-preserving pots, etc.; the invention patent application with publication number CN 104961335 A discloses a firing method of health-preserving magnetized glaze and health-preserving magnetized porcelain. It adds a large amount of iron oxide to the glaze. A special sintering system is used to convert Fe ₂ O ₃ into magnetic Fe ₃ O ₄ at 1250~1300°C to produce magnetic glaze and magnetized porcelain. However, regardless of whether it is black pottery, purple clay pot, or magnetized porcelain, its formula is mainly characterized by high iron content, which achieves the effects of color development, burning assistance, and magnetization, but its wear resistance is far from meeting the standards for wear-resistant ceramic products. . As an aggregate or filler, iron oxide is widely used in wear-resistant ceramic materials to increase the ceramic volume density without losing the strength and wear resistance of wear-resistant ceramic materials. Such high iron content Ceramics with high strength, high density and high wear resistance have not yet been reported.

The invention patent with application publication number CN 106565205 A discloses a wear-resistant ceramic whose raw materials include, by weight, 3 to 8 parts of iron oxide, 3 to 8 parts of quartz, 4 to 8 parts of anorthite, and barium sulfate. 3 to 5 parts, kaolin 12 to 20 parts, titanium dioxide 4 to 6 parts, graphene 1 to 3 parts, fly ash 2 to 4 parts, mineralizer 1 to 3 parts. It is claimed to have produced ceramics with better wear resistance, but the beneficial effect of iron oxide on the wear resistance of ceramics in this formula and the existence and mode of action of iron oxide are not revealed. The invention patent application with publication number CN 113529006 A discloses a wear-resistant nano-ceramic coating and its preparation method. It uses nano-alumina and nano-zirconia as raw materials, adds organic iron salts as the nano-iron oxide source, and uses plasma thermal spraying The technology generates a zirconium composite iron-aluminum spinel structure, so that the surface of the substrate has better volume density, mechanical strength and higher wear resistance and corrosion resistance. However, this method requires the use of arc or plasma arc as the heat source to convert the raw materials Heated to a molten or semi-molten state, the preparation temperature is extremely high, which limits its application fields.

Iron oxide has low hardness and poor wear resistance. To use it as a wear-resistant raw material in ceramic products, the hardness problem of ceramic products must be solved first. Iron oxide and aluminum oxide can be converted into iron-aluminum tips. Spar, but its synthesis conditions (such as electrofusion method, high-temperature sintering in a strong reducing atmosphere, etc.) are also relatively harsh and the cost is relatively high. Therefore, there are few reports of using a large amount (amount of more than 20%) of iron oxide as a high-specific-gravity aggregate or filler in wear-resistant ceramic materials to increase the specific gravity of the ceramic materials without losing the durability of the wear-resistant ceramic materials. Abrasiveness, strength and hardness.

Contents of the invention

The object of the present invention is to provide a wear-resistant ceramic grinding ball with high iron content.

The innovative point of the present invention is to use the combination scheme of calcium, magnesium, chromium, zinc, barium and iron oxide, γ~alumina, and zirconium oxide to convert some iron oxides with lower hardness into spinel minerals with higher hardness. AB2X4 (A represents divalent magnesium, iron, zinc and manganese, B represents trivalent aluminum, iron and chromium, X represents oxygen); through the design of a multi-valent glass phase system of potassium, calcium, magnesium, barium, aluminum and silicon, Sintering is achieved at a relatively low temperature (1100°C~1400°C); by starting at 1100°C and converting the oxidizing atmosphere into a reducing atmosphere for sintering and maintaining it until the end of high-fire heat preservation, the sintering method accelerates and improves the conversion of iron oxide into higher hardness The conversion rate of the spinel group mineral AB2X4; the innovation point of the present invention also lies in the adoption of a three-stage series grinding method, especially the use of a three-chamber continuous ball mill for one-stage rough grinding; the solution of the present invention not only solves the problem of low The problem of cost-effective production of high-specific-gravity ceramic grinding balls also solves the problem of reduced wear resistance, strength and hardness of ceramic materials caused by the large amount of iron oxide, and also solves the problem of converting iron oxide into spinels with higher hardness at lower temperatures. Stone family mineral AB2X4 problem.

The specific technical solutions of the present invention are:

A wear-resistant ceramic grinding ball with high iron content, including the following raw materials in mass percentage: bauxite 5~15%, iron oxide 20~60%, γ~alumina 20~65%, silicon oxide 1~5%, zirconium oxide 1~10%, zinc oxide 0.5~5%, chromium oxide 0.1~0.5%, cerium oxide 0.2~3%, feldspar 1~5%, talc 1~3%, calcium carbonate 0.5~3%, barium carbonate 0.2~ 2%.

Further, the bauxite includes the following mass components: Al2O3 70~85%, SiO2 8~20%, Fe2O3 1~5%, TiO2 2~5%, CaO 0.2~1%, MgO 0.05~ 1%, K2O 0.05~2%, Na2O 0.05~2%.

A method for preparing high-iron content wear-resistant ceramic grinding balls, including the following steps:

Mixing: Take the materials according to the formula, and mix them evenly to obtain the mixture;

Grinding: Grind the mixture to obtain grinding material;

Drying: Dry the grinding material to obtain dry material. The moisture content of the dry material is 1~3%;

Molding: Make the dry material into a ball blank;

Sintering: Sintering using a sintering method that converts an oxidizing atmosphere into a reducing atmosphere.

Furthermore, a conical twin-screw mixer is used for dry mixing during mixing.

Furthermore, a three-stage series grinding method is used for grinding; first, a continuous ball mill is used for one-stage coarse grinding to obtain a coarse grinding slurry; then, the coarse grinding slurry is passed into a vertical mixing mill for two-stage fine grinding to obtain fine abrasive. slurry; finally, the fine grinding slurry is passed into a horizontal sand mill for ultra-fine grinding to obtain abrasives.

Further, the fineness D98 of the coarse grinding slurry is 20~30 μm; the fineness D98 of the fine grinding slurry is 5~10 μm; and the fineness D98 of the abrasive is 1.0~2.5 μm.

Further, the continuous ball mill is a three-chamber continuous ball mill. The filling amount of the grinding balls loaded in the three chambers of the continuous ball mill is 40%. The three chambers are No. 1, No. 2 and No. 3. The weight ratio of each particle size of the grinding balls in the No. 2 warehouse is 30mm:25mm:20mm=2:5:3. The weight ratio of each particle size of the grinding balls in the No. 2 warehouse is 18mm:15mm:12mm=2:6:2. The weight ratio of each particle size of the grinding balls in the No. 1 warehouse is 10mm: 8mm: 6mm = 1:7:2. The input ratio of material water in the No. 1 warehouse is 3:4. It then passes through the No. 2 and No. 3 warehouses in sequence, starting from the No. 3 warehouse. When discharging material from the No. 1 warehouse, the rotating speed of the continuous ball mill is 28rpm.

Furthermore, spray drying is used during drying.

Further, the sintering method is: at room temperature to 300°C, slow temperature rise at 0.5°C/min; from 300°C to 1000°C, rapid temperature rise at 5°C/min; from 1000°C to the maximum sintering temperature, the maximum sintering temperature is 1100~1400 °C, heating up at 1 °C/min; holding at the highest sintering temperature for 2 to 5 hours; switching the oxidizing atmosphere to reducing atmosphere for sintering from 1000 °C, and maintaining it until the end of the highest sintering temperature holding; then rapidly cooling to 700 °C at 10 °C/min. Then slowly cool down to 500°C at 1.5°C/min, and finally cool down to room temperature at 5°C/min before exiting the kiln.

The beneficial effects of the present invention are: (Can you further explain the principles of these benefits below?)

1. In the present invention, through the above technical solution, relatively cheap iron oxide is widely used as a raw material with high specific gravity in ceramic products, and ceramics with higher specific gravity, better wear resistance and better strength are produced. products, reducing the use of zirconium oxide, yttrium-stabilized zirconium, cerium oxide, zirconium silicate, etc., and reducing raw material costs by more than 50%.

2. In the present invention, bauxite and γ~alumina with higher hardness are used as wear-resistant enhancers, which act as wear-resistant aggregates to improve the hardness and strength of ceramic products as a whole, making up for the lack of iron oxide hardness and wear resistance. At the same time, γ~aluminum oxide has high activity. Above 1100℃, under reducing atmosphere conditions, it can form spinel group minerals AB ₂ X ₄ with magnesium, iron, chromium and zinc in the formula, and has It is beneficial to increase the conversion rate and convert iron oxide with lower hardness into spinel compound with higher hardness. This is also one of the key points to ensure the hardness and wear resistance of ceramic grinding balls.

3. In the present invention, through the design of the multi-component glass phase system of potassium, calcium, magnesium, barium, aluminum and silicon, the high iron content wear-resistant ceramic grinding balls can be sintered at a relatively low temperature (1100°C~1400°C). At the same time, the phase transformation of iron oxide is ensured to form hematite, calcium iron spinel, mafic spinel, zinc iron spinel, barium iron spinel, almandine spinel, almandine garnet and other multi-phase and Mixture.

4. Zirconia and rare earth cerium oxide are also used in the present invention, and the phase change toughening mechanism further improves the toughness of the material.

5. The present invention adopts a three-stage grinding method. In the first stage, a three-chamber continuous ball mill is used for mixing and coarse grinding, a second-stage vertical stirring mill is used for fine grinding, and a three-stage horizontal sand mill is used for ultra-fine grinding, realizing continuous series grinding. , with a high degree of automation; and according to the characteristics of the material from coarse to fine after grinding and the optimal fineness of the material processed by the grinding machine, a reasonable combination of grinding balls and abrasive machines is more energy-saving and efficient.

6. The present invention adopts a sintering system that converts an oxidizing atmosphere into a reducing atmosphere: room temperature ~ 300°C, slowly increasing the temperature at 0.5°C/min, mainly to slowly discharge the free water of the green body and the γ~alumina bound water to prevent excessive water loss of the green body. Fast cracking; 300℃~1000℃, rapid heating at 5℃/min, shortening the sintering cycle; 1000℃~maximum sintering temperature (1100℃~1400℃), heating rate 1℃/min, and holding at the maximum sintering temperature for 2~ For 5 hours, starting at 1000°C, the oxidizing atmosphere is converted into a reducing atmosphere for sintering and maintained until the end of the highest temperature insulation. The reducing atmosphere is conducive to promoting the transformation of iron oxide into spinel minerals, thereby improving the strength and wear resistance of ceramic products; High temperature ~700℃, rapid cooling at 10℃/min to increase supercooling and obtain more fine crystals, which is beneficial to improving the wear resistance of products; 700℃~500℃, slow cooling at 1.5℃/min to prevent silicon oxide crystal form transformation Cause the product to break; 500℃~room temperature, cool down at 5℃/min, and leave the kiln.

Implementation

The technical solutions in the embodiments of the present invention will be described clearly and completely below.

Example 1: A wear-resistant ceramic grinding ball with high iron content, including the following mass percentage of raw materials: bauxite 15%, iron oxide 28.5%, γ~alumina 20%, silicon oxide 5%, zirconium oxide 10%, oxide Zinc 5%, chromium oxide 0.5%, cerium oxide 3%, feldspar 5%, talc 3%, calcium carbonate 3%, barium carbonate 2%. Bauxite includes the following mass components: Al ₂ O ₃ 85%, SiO ₂ 8%, Fe ₂ O ₃ 4.65%, TiO ₂ 2%, CaO 0.2%, MgO 0.05%, K ₂ O 0.05%, Na ₂ O 0.05%.

Embodiment 2: A high-iron content wear-resistant ceramic grinding ball, including the following mass percentage of raw materials: bauxite 5%, iron oxide 60%, γ~alumina 22%, silicon oxide 2%, zirconium oxide 2%, oxide Zinc 1.7%, chromium oxide 0.3%, cerium oxide 1%, feldspar 2%, talc 2%, calcium carbonate 1%, barium carbonate 1%. Bauxite includes the following mass components: Al ₂ O ₃ 70%, SiO ₂ 14%, Fe ₂ O ₃ 5%, TiO ₂ 5%, CaO 1%, MgO 1%, K ₂ O 2%, Na ₂ O 2%.

Embodiment 3: A wear-resistant ceramic grinding ball with high iron content, including the following mass percentage of raw materials: bauxite 9.5%, iron oxide 20%, γ~alumina 65%, silicon oxide 1%, zirconium oxide 1%, oxide Zinc 0.5%, chromium oxide 0.1%, cerium oxide 0.2%, feldspar 1%, talc 1%, calcium carbonate 0.5%, barium carbonate 0.2%. Bauxite includes the following mass components: Al ₂ O ₃ 71.9%, SiO ₂ 20%, Fe ₂ O ₃ 2%, TiO ₂ 3%, CaO 1.02%, MgO 0.08%, K ₂ O 1%, Na ₂ O 1%.

Example 4: A method for preparing high-iron content wear-resistant ceramic grinding balls, including the following steps:

Mixing: Take the materials according to the formula of Example 1, mix them evenly to obtain a mixture; use a conical twin-screw mixer for dry mixing.

Grinding: Grind the mixture to obtain abrasive; grind using a three-stage series grinding method; first, use a continuous ball mill to perform a coarse grinding to obtain a coarse grinding slurry; then, pass the coarse grinding slurry into a vertical mixing mill Perform two stages of fine grinding to obtain a fine grinding slurry; finally, pass the fine grinding slurry into a horizontal sand mill for ultra-fine grinding to obtain abrasives; the continuous ball mill is a three-chamber continuous ball mill, and the three chambers of the continuous ball mill are loaded with grinding balls. The filling amount is 40%, and the three warehouses are No. 1, No. 2, and No. 3. The weight ratio of each particle size of the grinding balls in No. 1 is 30mm:25mm:20mm=2:5:3. The weight ratio of each particle size of the grinding balls in the No. 3 warehouse is 18mm: 15mm: 12mm = 2:6:2. The weight ratio of each particle size of the grinding balls in the No. 3 warehouse is 10mm: 8mm: 6mm = 1:7:2. The input ratio of material to water in the No. 1 warehouse is 3:4. It then passes through the No. 2 and No. 3 warehouses in sequence and discharges the material from the No. 3 warehouse. The rotation speed of the continuous ball mill is 28 rpm.

Drying: Dry the grinding material to obtain dry material. The moisture content of the dry material is 1%; spray drying is used during drying.

Molding: Make the dry material into a ball blank;

Sintering: Use the sintering method from oxidizing atmosphere to reducing atmosphere; the sintering method is: when room temperature ~ 300℃, slow heating at 0.5℃/min; from 300℃ to 1000℃, rapid heating at 5℃/min; from 1000℃ to the maximum sintering temperature, the highest The sintering temperature is 1100°C, heating up at 1°C/min; holding at the highest sintering temperature for 2 to 5 hours; switching the oxidizing atmosphere to reducing atmosphere for sintering from 1000°C, and maintaining it until the end of the holding at the highest sintering temperature; and then rapidly cooling down at 10°C/min. to 700℃, then slowly cool down to 500℃ at 1.5℃/min, and finally cool down to room temperature at 5℃/min before leaving the kiln.

Example 5: A method for preparing high-iron content wear-resistant ceramic grinding balls, including the following steps:

Mixing: Take the materials according to the formula of Example 2, mix them evenly after taking the materials to obtain a mixture; use a conical twin-screw mixer for dry mixing.

Grinding: Grind the mixture to obtain abrasive; use a three-stage series grinding method for grinding; first, use a continuous ball mill to perform a coarse grinding to obtain a coarse grinding slurry; then, pass the coarse grinding slurry into a vertical mixing mill Perform two stages of fine grinding to obtain a fine grinding slurry; finally, pass the fine grinding slurry into a horizontal sand mill for ultra-fine grinding to obtain abrasives; the continuous ball mill is a three-chamber continuous ball mill, and the three chambers of the continuous ball mill are loaded with grinding balls. The filling amount is 40%, and the three warehouses are No. 1, No. 2, and No. 3. The weight ratio of each particle size of the grinding balls in No. 1 is 30mm:25mm:20mm=2:5:3. The weight ratio of each particle size of the grinding balls in the No. 3 warehouse is 18mm: 15mm: 12mm = 2:6:2. The weight ratio of each particle size of the grinding balls in the No. 3 warehouse is 10mm: 8mm: 6mm = 1:7:2. The input ratio of material to water in the No. 1 warehouse is 3:4. It then passes through the No. 2 and No. 3 warehouses in sequence and discharges the material from the No. 3 warehouse. The rotation speed of the continuous ball mill is 28 rpm.

Drying: Dry the grinding material to obtain dry material. The moisture content of the dry material is 2%; spray drying is used during drying.

Molding: Make the dry material into a ball blank;

Sintering: Sintering using a sintering method that converts an oxidizing atmosphere into a reducing atmosphere; the sintering method is:

When room temperature is ~300℃, the temperature rises slowly at 0.5℃/min; between 300℃ and 1000℃, the temperature rises quickly at 5℃/min; between 1000℃ and the maximum sintering temperature, the maximum sintering temperature is 1200℃, and the temperature rises at 1℃/min; the maximum sintering temperature Keep the temperature for 2~5 hours; switch the oxidizing atmosphere to the reducing atmosphere for sintering from 1000°C, and maintain it until the highest sintering temperature is completed; then quickly cool down to 700°C at 10°C/min, and then slowly cool down to 500°C at 1.5°C/min. Finally, the temperature is lowered to room temperature at 5°C/min and discharged from the kiln.

Example 6: A method for preparing high-iron content wear-resistant ceramic grinding balls, including the following steps:

Mixing: Take the materials according to the formula of Example 3, mix them evenly after taking the materials to obtain a mixture; use a conical twin-screw mixer for dry mixing.

Grinding: Grind the mixture to obtain abrasive; use a three-stage series grinding method for grinding; first, use a continuous ball mill to perform a coarse grinding to obtain a coarse grinding slurry; then, pass the coarse grinding slurry into a vertical mixing mill Perform two stages of fine grinding to obtain a fine grinding slurry; finally, pass the fine grinding slurry into a horizontal sand mill for ultra-fine grinding to obtain abrasives; the continuous ball mill is a three-chamber continuous ball mill, and the three chambers of the continuous ball mill are loaded with grinding balls. The filling amount is 40%, and the three warehouses are No. 1, No. 2, and No. 3. The weight ratio of each particle size of the grinding balls in No. 1 is 30mm:25mm:20mm=2:5:3. The weight ratio of each particle size of the grinding balls in the No. 3 warehouse is 18mm: 15mm: 12mm = 2:6:2. The weight ratio of each particle size of the grinding balls in the No. 3 warehouse is 10mm: 8mm: 6mm = 1:7:2. The input ratio of material to water in the No. 1 warehouse is 3:4. It then passes through the No. 2 and No. 3 warehouses in sequence and discharges the material from the No. 3 warehouse. The rotation speed of the continuous ball mill is 28 rpm.

Drying: Dry the grinding material to obtain dry material. The moisture content of the dry material is 3%; spray drying is used during drying.

Molding: Make the dry material into a ball blank;

Sintering: Use the sintering method from oxidizing atmosphere to reducing atmosphere. The sintering method is: when room temperature is ~300℃, slow heating at 0.5℃/min; when 300~1000℃, rapid heating at 5℃/min; between 1000℃~the maximum sintering temperature, so The maximum sintering temperature mentioned above is 1400℃, heating at 1℃/min; holding at the maximum sintering temperature for 2~5h; converting the oxidizing atmosphere to reducing atmosphere for sintering from 1000℃, and maintaining it until the end of the maximum sintering temperature holding; and then holding at 10℃/min. Rapidly cool down to 700°C, then slowly cool down to 500°C at 1.5°C/min, and finally cool down to room temperature at 5°C/min before exiting the kiln.

Example parameters:

Element Coarse grinding slurry fineness D98 Fine grinding slurry fineness D98 Grinding fineness D98 Finished product density g/cm³ Finished product wear g/kg/h Finished product Vickers hardness HV5 Implementation 4 22.351 6.391 1.012 3.86 0.63 850 Implementation 5 29.823 9.881 2.498 4.33 1.33 950 Implementation 6 20.311 5.308 1.221 3.92 0.88 1250

Performance testing method:

Wear test, use a 2L vertical sand mill to test the self-abrasion of the grinding ball. The test method is 1200g ball: 400g water, self-grinding for 2 hours. After the grinding is completed, wash and dry the grinding ball. Weigh the weight loss of the grinding ball, and Calculate wear (g/kg/h);

Vickers hardness test, grinding ball inlay, grinding and polishing, use Vickers hardness tester to test Vickers hardness (HV5);

Specific gravity test, use the Archimedes drainage method to test the specific gravity of the grinding ball (g/cm³)

The wear-resistant ceramic balls with high iron content produced by this technical solution have high specific gravity and high iron content, which affects its wide application to a certain extent. It is widely used in industries sensitive to iron content such as daily porcelain, special ceramics, and papermaking. It is not suitable for industries such as dyes and dyes. However, it also has excellent application effects for specific grinding fields, such as cement, mining, device polishing, etc.

The described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Claims (9)

1. The wear-resistant ceramic grinding ball with high iron content is characterized by comprising the following raw materials in percentage by mass: 5-15% of bauxite, 20-60% of ferric oxide, 20-65% of gamma-alumina, 1-5% of silicon oxide, 1-10% of zirconium oxide, 0.5-5% of zinc oxide, 0.1-0.5% of chromium oxide, 0.2-3% of cerium oxide, 1-5% of feldspar, 1-3% of talcum, 0.5-3% of calcium carbonate and 0.2-2% of barium carbonate.

2. The high iron content wear resistant ceramic grinding ball of claim 1, wherein the bauxite comprises the following components in mass: al (Al) ₂ O ₃ 70~85%，SiO ₂ 8~20%，Fe ₂ O ₃ 1~5%，TiO ₂ 2~5%，CaO 0.2~1%，MgO 0.05~1%，K ₂ O 0.05~2%，Na ₂ O 0.05~2%。

3. A method for preparing the high iron content wear resistant ceramic grinding ball as set forth in claim 1, comprising the steps of:

(1) Mixing: taking materials according to a formula, and uniformly mixing the materials to obtain a mixture;

(2) Grinding: grinding the mixture to obtain an abrasive;

(3) And (3) drying: drying the grinding material to obtain a dried material, wherein the water content of the dried material is 1-3%;

(4) And (3) forming: manufacturing a dried material into a ball blank;

(5) Sintering: sintering by adopting a sintering method from an oxidizing atmosphere to a reducing atmosphere.

4. A method for preparing a high iron content wear resistant ceramic grinding ball according to claim 3 wherein the mixing is performed by a conical twin screw mixer.

5. The method for preparing the high-iron-content wear-resistant ceramic grinding ball according to claim 3, wherein the grinding is performed by adopting a three-section serial grinding method; firstly, carrying out one-stage rough grinding by using a continuous ball mill to obtain rough grinding slurry; then, the following steps are carried out; feeding the coarse grinding slurry into a vertical stirring mill for secondary fine grinding to obtain fine grinding slurry; and finally, introducing the fine grinding slurry into a horizontal sand mill for superfine grinding to obtain the grinding material.

6. The method for preparing the high-iron-content wear-resistant ceramic grinding balls according to claim 5, wherein the fineness D98 of the coarse grinding slurry is 20-30 μm; the fineness D98 of the fine grinding slurry is 5-10 mu m; the fineness D98 of the abrasive is 1.0-2.5 mu m.

7. The method for preparing the high-iron-content wear-resistant ceramic grinding ball according to claim 3, wherein the continuous ball mill is a three-bin continuous ball mill, the filling amount of the grinding balls loaded in the three bins of the continuous ball mill is 40%, the three bins are a first bin, a second bin and a third bin respectively, and the weight ratio of the grain sizes of the grinding balls in the first bin is 30mm:25mm:20mm = 2:5:3, the weight ratio of the grain diameters of the grinding balls in the second bin is 18mm:15mm:12mm = 2:6:2, the weight ratio of each grain diameter of the grinding ball in the third bin is 10mm:8mm:6mm = 1:7:2, the water input ratio of the first bin is 3:4, sequentially passing through a second bin and a third bin, and discharging from the third bin, wherein the rotating speed of the continuous ball mill is 28rpm.

8. The method for producing high iron content wear resistant ceramic grinding balls according to claim 3, wherein spray drying is used in the drying.

9. The method for preparing the high-iron-content wear-resistant ceramic grinding ball according to claim 3, wherein the sintering method is as follows: slowly heating at the room temperature to 300 ℃ at the speed of 0.5 ℃/min; rapidly heating at 300-1000 ℃ at 5 ℃/min; 1000 ℃ to the highest sintering temperature, wherein the highest sintering temperature is 1100 ℃ to 1400 ℃, and the temperature is increased at 1 ℃/min; preserving the heat for 2-5 h at the highest sintering temperature; converting the oxidizing atmosphere into reducing atmosphere for sintering at 1000 ℃, and maintaining the temperature to the highest sintering temperature for heat preservation; then rapidly cooling to 700 ℃ at 10 ℃/min, then slowly cooling to 500 ℃ at 1.5 ℃/min, finally cooling to room temperature at 5 ℃/min, and discharging from the kiln.