A complete solid waste mine remediation soil and its preparation method

Abstract

The application discloses a kind of full solid waste mine repair soil and preparation method thereof, it is related to soil repair technical field, the full solid waste mine repair soil includes the following weight content of raw material composition: titanium gypsum 50~80%, converter steel slag 15~30%, titanium extraction tailings 5~15%, sintering machine head ash 0~5%.In the application, titanium gypsum contains fine-grained calcium sulfate dihydrate, iron hydroxide, etc., has good water retention effect;Converter steel slag contains P, can provide phosphorus fertilizer effect for soil, and the alkalinity of steel slag can adjust the acidity and alkalinity of soil;Secondly, steel slag and titanium extraction tailings jointly act, play the role of solidifying soil and preventing water and soil loss;The pozzolanic activity of titanium extraction tailings is good, and forms strength matrix with steel slag, can solidify soil;Sintering machine head ash contains K, can provide potassium fertilizer effect for soil.

Description

Technical Field

[0001] This invention relates to the field of soil remediation technology, specifically to a whole solid waste mine remediation soil and its preparation method. Background Technology

[0002] Panzhihua, Sichuan Province, China, is located in the Hengduan Mountains and is rich in mineral resources, with numerous mines and metallurgical enterprises. Years of mining have resulted in large areas of exposed mines, tailings dams, and waste rock dumps, significantly impacting the local ecological environment. In accordance with national ecological and environmental protection policies, exposed mines, tailings dams, and waste rock dumps must be restored and revegetated by planting grass and trees to restore the ecological environment. However, Panzhihua itself lacks high-quality soil, and mine restoration requires large amounts of soil; therefore, excessive soil extraction will inevitably cause secondary damage to the ecological environment.

[0003] The Panzhihua region generates a large amount of solid waste resources, characterized by its large scale and diverse types. For example, the annual output of iron ore (titanium ore) tailings is approximately 8 million tons, titanium-containing blast furnace slag is approximately 4 million tons, converter steel slag is approximately 400,000 tons, and titanium gypsum is approximately 800,000 tons. While some of these solid waste resources are utilized, the majority are currently disposed of through stockpiling and landfilling, occupying significant amounts of land and impacting the surrounding environment.

[0004] The existing mine restoration and revegetation projects in exposed mining areas use soils with poor quality (high gravel content), low fertility, poor water retention, and poor soil conditioning (acidic soil). The survival rate of revegetated grass and trees is very low, which is currently the most significant problem affecting mine restoration. Summary of the Invention

[0005] The purpose of this invention is to provide a complete solid waste mine remediation soil and its preparation method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A whole solid waste mine remediation soil comprises the following raw materials by weight: 50-80% titanium gypsum, 15-30% converter steel slag, 5-15% titanium extraction tailings, and 0-5% sintering machine head ash.

[0008] As a further aspect of the present invention, the soil for the remediation of solid waste mines comprises the following raw materials in terms of weight: 60-75% titanium gypsum, 20-25% converter steel slag, 8-10% titanium extraction tailings, and 2-4% sintering machine head ash.

[0009] As a further embodiment of the present invention, the soil for the remediation of solid waste mines comprises the following raw materials by weight: 65% titanium gypsum, 22.5% converter steel slag, 10% titanium extraction tailings, and 2.5% sintering machine head ash.

[0010] As a further embodiment of the present invention, the titanium gypsum comprises the following raw material composition by weight: CaO 28-30%, SO3 34-36%, Fe2O3 6-9%, TiO2 3-4%, Al2O3 3-4%, MgO 1-2%, and SiO2 4-6%.

[0011] As a further embodiment of the present invention, the converter steel slag comprises the following raw material composition by weight: P 0.5-1.5%, CaO 34-36%, MgO 10-15%, Fe2O3 20-30%, SiO2 10-13%, Al2O3 1-3%, and f-CaO 5-8%.

[0012] As a further embodiment of the present invention, the titanium extraction tailings comprises the following raw material composition by weight: CaO 25-30%, SiO2 24-26%, Al2O3 12-14%, MgO 7-9%, TiO2 5-8%, C 3-6%, and Cl 2.5-4.5%.

[0013] As a further embodiment of the present invention, the sintering machine head ash comprises the following raw material composition by weight: K2O 12-15%, TFe 25-35%, Cl 6-22%, and S 1-4%.

[0014] Another object of the present invention is to provide a method for preparing the subject, comprising the following steps:

[0015] S10. Dehydrate and pulverize titanium gypsum;

[0016] S20. After the converter steel slag is hot-poured and slowly cooled, it is crushed, ground and magnetically separated to remove iron, so as to form steel slag tailings.

[0017] S30. Steel slag tailings, crushed titanium gypsum, titanium extraction tailings and sintering machine head ash are mixed to obtain solid waste mine remediation soil.

[0018] As a further aspect of the present invention: the particle size of the titanium gypsum after dehydration and pulverization is less than 2 mm, and the moisture content is less than 3%.

[0019] As a further embodiment of the present invention: the particle size of the steel slag tailings is less than 5 mm and the moisture content is less than 3%.

[0020] Compared with existing technologies, the beneficial effects of this invention are as follows: The titanium gypsum in this invention contains finely granulated calcium sulfate dihydrate and ferric hydroxide, which have good water retention properties; the converter steel slag contains phosphorus, which can provide phosphorus fertilizer to the soil, and the alkalinity of the steel slag can regulate the soil's pH; secondly, the steel slag and titanium extraction tailings work together to solidify the soil and prevent soil erosion; the titanium extraction tailings volcanic ash has good activity and, together with the steel slag, forms a strong matrix that can solidify the soil; the sintering machine head ash contains potassium, which can provide potassium fertilizer to the soil. The calcium silicate (aluminate) glass component content in the titanium extraction tailings reaches over 85%, exhibiting good volcanic ash activity, and can react with free calcium oxide and magnesium oxide in the steel slag to form strong matrices such as CSH cement stone and ettringite, thus solidifying the soil. Attached Figure Description

[0021] Figure 1 This is a specific process for preparing a method for remediating solid waste mine soil according to an embodiment of the present invention. Detailed Implementation

[0022] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0023] A solid waste mine remediation soil comprises the following raw materials by weight: 50-80% titanium gypsum, 15-30% converter steel slag, 5-15% titanium extraction tailings, and 0-5% sintering machine head ash.

[0024] Titanium gypsum is obtained from the sulfuric acid process for producing titanium dioxide.

[0025] The titanium gypsum comprises the following raw material composition by weight (w%): CaO 28-30%, SO3 34-36%, Fe2O3 6-9%, TiO2 3-4%, Al2O3 3-4%, MgO 1-2%, and SiO2 4-6%.

[0026] The converter slag is obtained by smelting high, medium and low carbon steel in a converter.

[0027] The converter slag comprises the following raw material composition by weight (w%): P 0.5-1.5%, CaO 34-36%, MgO 10-15%, Fe2O3 20-30%, SiO2 10-13%, Al2O3 1-3%, and f-CaO 5-8%.

[0028] The titanium extraction tailings are obtained by extracting titanium from high-titanium blast furnace slag.

[0029] The titanium extraction tailings comprises the following raw material composition by weight (w%): CaO 25-30%, SiO2 24-26%, Al2O3 12-14%, MgO 7-9%, TiO2 5-8%, C 3-6%, and Cl 2.5-4.5%.

[0030] The sintering machine head ash is the fly ash after dust removal in the sintering machine.

[0031] The sintering machine head ash comprises the following raw material composition by weight (w%): K2O 12-15%, TFe 25-35%, Cl 6-22%, and S 1-4%.

[0032] A method for preparing soil for the remediation of solid waste mines includes the following steps:

[0033] S10. Dehydrate and pulverize titanium gypsum;

[0034] Specifically, the titanium plaster can be dehydrated by air drying.

[0035] S20. After the converter steel slag is hot-poured and slowly cooled, it is crushed, ground and magnetically separated to remove iron, so as to form steel slag tailings.

[0036] S30. Steel slag tailings, crushed titanium gypsum, titanium extraction tailings and sintering machine head ash are mixed to obtain solid waste mine remediation soil.

[0037] In this embodiment of the invention, the titanium gypsum after dehydration and pulverization has a particle size of less than 2 mm and a moisture content of less than 3%.

[0038] In this embodiment of the invention, the steel slag tailings have a particle size of less than 5 mm and a moisture content of less than 3%.

[0039] In this embodiment of the invention, the titanium extraction tailings have a particle size of less than 0.5 mm and a moisture content of less than 3%.

[0040] In this embodiment of the invention, the particle size of the sintering machine head ash is less than 0.1 mm and the moisture content is less than 1%.

[0041] Furthermore, the solid waste mine remediation soil obtained in step S30 is subjected to granulation treatment to obtain granules of 5-20mm, which can be used as a planting substrate for flowers and green plants.

[0042] In this invention, titanium gypsum contains finely granulated calcium sulfate dihydrate and ferric hydroxide, which have good water retention properties. Converter steel slag contains phosphorus, which can provide phosphorus fertilizer to the soil, and the alkalinity of the steel slag can regulate the soil's pH. Furthermore, the steel slag and titanium extraction tailings work together to solidify the soil and prevent soil erosion. The titanium extraction tailings volcanic ash has good activity and, together with the steel slag, forms a strong matrix that can solidify the soil. Sintering machine head ash contains potassium, which can provide potassium fertilizer to the soil. The titanium extraction tailings contain more than 85% calcium silicate (aluminate) glass components, exhibiting good volcanic ash activity. It can react with free calcium oxide and magnesium oxide in the steel slag to form strong matrices such as CSH cement stone and ettringite, thus solidifying the soil. This invention relates to a method for restoring soil from mines using all solid waste. It makes full use of the characteristics of various solid wastes, can replace natural soil, and features good water retention, good consolidation, prevention of soil erosion, and good fertilizer effect. It uses all solid waste resources, has a simple and mature production process, and low raw material costs. It not only eliminates the secondary damage to the local environment caused by soil extraction, but also realizes the green resource utilization of a large amount of solid waste resources, and has broad prospects for promotion and application.

[0043] Example 1

[0044] A solid waste mine remediation soil comprises the following raw materials by weight: 80% titanium gypsum, 15% converter steel slag, and 5% titanium extraction tailings.

[0045] Titanium gypsum is obtained from the sulfuric acid process for producing titanium dioxide.

[0046] The titanium gypsum comprises the following raw material composition by weight (w%): CaO 28-30%, SO3 34-36%, Fe2O3 6-9%, TiO2 3-4%, Al2O3 3-4%, MgO 1-2%, and SiO2 4-6%.

[0047] The converter slag is obtained by smelting high, medium and low carbon steel in a converter.

[0048] The converter slag comprises the following raw material composition by weight (w%): P 0.5-1.5%, CaO 34-36%, MgO 10-15%, Fe2O3 20-30%, SiO2 10-13%, Al2O3 1-3%, and f-CaO 5-8%.

[0049] The titanium extraction tailings are obtained by extracting titanium from high-titanium blast furnace slag.

[0050] The titanium extraction tailings comprises the following raw material composition by weight (w%): CaO 25-30%, SiO2 24-26%, Al2O3 12-14%, MgO 7-9%, TiO2 5-8%, C 3-6%, and Cl 2.5-4.5%.

[0051] A method for preparing soil for the remediation of solid waste mines includes the following steps:

[0052] S10. Dehydrate and pulverize titanium gypsum;

[0053] S20. After the converter steel slag is hot-poured and slowly cooled, it is crushed, ground and magnetically separated to remove iron, so as to form steel slag tailings.

[0054] S30. Mix steel slag tailings, crushed titanium gypsum and titanium extraction tailings to obtain solid waste mine remediation soil.

[0055] In this embodiment of the invention, the titanium gypsum after dehydration and pulverization has a particle size of less than 2 mm and a moisture content of less than 3%.

[0056] In this embodiment of the invention, the steel slag tailings have a particle size of less than 5 mm and a moisture content of less than 3%.

[0057] In this embodiment of the invention, the titanium extraction tailings have a particle size of less than 0.5 mm and a moisture content of less than 3%.

[0058] Furthermore, the solid waste mine remediation soil obtained in step S30 is subjected to granulation treatment to obtain granules of 5-20mm, which can be used as a planting substrate for flowers and green plants.

[0059] Example 2

[0060] A solid waste mine remediation soil comprises the following raw materials by weight: 75% titanium gypsum, 15% converter steel slag, 8% titanium extraction tailings, and 2% sintering machine head ash.

[0061] Titanium gypsum is obtained from the sulfuric acid process for producing titanium dioxide.

[0062] The titanium gypsum comprises the following raw material composition by weight (w%): CaO 28-30%, SO3 34-36%, Fe2O3 6-9%, TiO2 3-4%, Al2O3 3-4%, MgO 1-2%, and SiO2 4-6%.

[0063] The converter slag is obtained by smelting high, medium and low carbon steel in a converter.

[0064] The converter slag comprises the following raw material composition by weight (w%): P 0.5-1.5%, CaO 34-36%, MgO 10-15%, Fe2O3 20-30%, SiO2 10-13%, Al2O3 1-3%, and f-CaO 5-8%.

[0065] The titanium extraction tailings are obtained by extracting titanium from high-titanium blast furnace slag.

[0066] The titanium extraction tailings comprises the following raw material composition by weight (w%): CaO 25-30%, SiO2 24-26%, Al2O3 12-14%, MgO 7-9%, TiO2 5-8%, C 3-6%, and Cl 2.5-4.5%.

[0067] The sintering machine head ash is the fly ash after dust removal in the sintering machine.

[0068] The sintering machine head ash comprises the following raw material composition by weight (w%): K2O 12-15%, TFe 25-35%, Cl 6-22%, and S 1-4%.

[0069] A method for preparing soil for the remediation of solid waste mines includes the following steps:

[0070] S10. Dehydrate and pulverize titanium gypsum;

[0071] S20. After the converter steel slag is hot-poured and slowly cooled, it is crushed, ground and magnetically separated to remove iron, so as to form steel slag tailings.

[0072] S30. Steel slag tailings, crushed titanium gypsum, titanium extraction tailings and sintering machine head ash are mixed to obtain solid waste mine remediation soil.

[0073] In this embodiment of the invention, the titanium gypsum after dehydration and pulverization has a particle size of less than 2 mm and a moisture content of less than 3%.

[0074] In this embodiment of the invention, the steel slag tailings have a particle size of less than 5 mm and a moisture content of less than 3%.

[0075] In this embodiment of the invention, the titanium extraction tailings have a particle size of less than 0.5 mm and a moisture content of less than 3%.

[0076] In this embodiment of the invention, the particle size of the sintering machine head ash is less than 0.1 mm and the moisture content is less than 1%.

[0077] Furthermore, the solid waste mine remediation soil obtained in step S30 is subjected to granulation treatment to obtain granules of 5-20mm, which can be used as a planting substrate for flowers and green plants.

[0078] Example 3

[0079] A solid waste mine remediation soil comprises the following raw materials by weight: 60% titanium gypsum, 20% converter steel slag, 15% titanium extraction tailings, and 5% sintering machine head ash.

[0080] Titanium gypsum is obtained from the sulfuric acid process for producing titanium dioxide.

[0081] The titanium gypsum comprises the following raw material composition by weight (w%): CaO 28-30%, SO3 34-36%, Fe2O3 6-9%, TiO2 3-4%, Al2O3 3-4%, MgO 1-2%, and SiO2 4-6%.

[0082] The converter slag is obtained by smelting high, medium and low carbon steel in a converter.

[0083] The converter slag comprises the following raw material composition by weight (w%): P 0.5-1.5%, CaO 34-36%, MgO 10-15%, Fe2O3 20-30%, SiO2 10-13%, Al2O3 1-3%, and f-CaO 5-8%.

[0084] The titanium extraction tailings are obtained by extracting titanium from high-titanium blast furnace slag.

[0085] The titanium extraction tailings comprises the following raw material composition by weight (w%): CaO 25-30%, SiO2 24-26%, Al2O3 12-14%, MgO 7-9%, TiO2 5-8%, C 3-6%, and Cl 2.5-4.5%.

[0086] The sintering machine head ash is the fly ash after dust removal in the sintering machine.

[0087] The sintering machine head ash comprises the following raw material composition by weight (w%): K2O 12-15%, TFe 25-35%, Cl 6-22%, and S 1-4%.

[0088] A method for preparing soil for the remediation of solid waste mines includes the following steps:

[0089] S10. Dehydrate and pulverize titanium gypsum;

[0090] S20. After the converter steel slag is hot-poured and slowly cooled, it is crushed, ground and magnetically separated to remove iron, so as to form steel slag tailings.

[0091] S30. Steel slag tailings, crushed titanium gypsum, titanium extraction tailings and sintering machine head ash are mixed to obtain solid waste mine remediation soil.

[0092] In this embodiment of the invention, the titanium gypsum after dehydration and pulverization has a particle size of less than 2 mm and a moisture content of less than 3%.

[0093] In this embodiment of the invention, the steel slag tailings have a particle size of less than 5 mm and a moisture content of less than 3%.

[0094] In this embodiment of the invention, the titanium extraction tailings have a particle size of less than 0.5 mm and a moisture content of less than 3%.

[0095] In this embodiment of the invention, the particle size of the sintering machine head ash is less than 0.1 mm and the moisture content is less than 1%.

[0096] Furthermore, the solid waste mine remediation soil obtained in step S30 is subjected to granulation treatment to obtain granules of 5-20mm, which can be used as a planting substrate for flowers and green plants.

[0097] Example 4

[0098] A solid waste mine remediation soil comprises the following raw materials by weight: 50% titanium gypsum, 30% converter steel slag, 15% titanium extraction tailings, and 5% sintering machine head ash.

[0099] Titanium gypsum is obtained from the sulfuric acid process for producing titanium dioxide.

[0100] The titanium gypsum comprises the following raw material composition by weight (w%): CaO 28-30%, SO3 34-36%, Fe2O3 6-9%, TiO2 3-4%, Al2O3 3-4%, MgO 1-2%, and SiO2 4-6%.

[0101] The converter slag is obtained by smelting high, medium and low carbon steel in a converter.

[0102] The converter slag comprises the following raw material composition by weight (w%): P 0.5-1.5%, CaO 34-36%, MgO 10-15%, Fe2O3 20-30%, SiO2 10-13%, Al2O3 1-3%, and f-CaO 5-8%.

[0103] The titanium extraction tailings are obtained by extracting titanium from high-titanium blast furnace slag.

[0104] The titanium extraction tailings comprises the following raw material composition by weight (w%): CaO 25-30%, SiO2 24-26%, Al2O3 12-14%, MgO 7-9%, TiO2 5-8%, C 3-6%, and Cl 2.5-4.5%.

[0105] The sintering machine head ash is the fly ash after dust removal in the sintering machine.

[0106] The sintering machine head ash comprises the following raw material composition by weight (w%): K2O 12-15%, TFe 25-35%, Cl 6-22%, and S 1-4%.

[0107] A method for preparing soil for the remediation of solid waste mines includes the following steps:

[0108] S10. Dehydrate and pulverize titanium gypsum;

[0109] S20. After the converter steel slag is hot-poured and slowly cooled, it is crushed, ground and magnetically separated to remove iron, so as to form steel slag tailings.

[0110] S30. Steel slag tailings, crushed titanium gypsum, titanium extraction tailings and sintering machine head ash are mixed to obtain solid waste mine remediation soil.

[0111] In this embodiment of the invention, the titanium gypsum after dehydration and pulverization has a particle size of less than 2 mm and a moisture content of less than 3%.

[0112] In this embodiment of the invention, the steel slag tailings have a particle size of less than 5 mm and a moisture content of less than 3%.

[0113] In this embodiment of the invention, the titanium extraction tailings have a particle size of less than 0.5 mm and a moisture content of less than 3%.

[0114] In this embodiment of the invention, the particle size of the sintering machine head ash is less than 0.1 mm and the moisture content is less than 1%.

[0115] Furthermore, the solid waste mine remediation soil obtained in step S30 is subjected to granulation treatment to obtain granules of 5-20mm, which can be used as a planting substrate for flowers and green plants.

[0116] Example 5

[0117] A solid waste mine remediation soil comprises the following raw materials by weight: 60% titanium gypsum, 20% converter steel slag, 15% titanium extraction tailings, and 5% sintering machine head ash.

[0118] Titanium gypsum is obtained from the sulfuric acid process for producing titanium dioxide.

[0119] The titanium gypsum comprises the following raw material composition by weight (w%): CaO 28-30%, SO3 34-36%, Fe2O3 6-9%, TiO2 3-4%, Al2O3 3-4%, MgO 1-2%, and SiO2 4-6%.

[0120] The converter slag is obtained by smelting high, medium and low carbon steel in a converter.

[0121] The converter slag comprises the following raw material composition by weight (w%): P 0.5-1.5%, CaO 34-36%, MgO 10-15%, Fe2O3 20-30%, SiO2 10-13%, Al2O3 1-3%, and f-CaO 5-8%.

[0122] The titanium extraction tailings are obtained by extracting titanium from high-titanium blast furnace slag.

[0123] The titanium extraction tailings comprises the following raw material composition by weight (w%): CaO 25-30%, SiO2 24-26%, Al2O3 12-14%, MgO 7-9%, TiO2 5-8%, C 3-6%, and Cl 2.5-4.5%.

[0124] The sintering machine head ash is the fly ash after dust removal in the sintering machine.

[0125] The sintering machine head ash comprises the following raw material composition by weight (w%): K2O 12-15%, TFe 25-35%, Cl 6-22%, and S 1-4%.

[0126] A method for preparing soil for the remediation of solid waste mines includes the following steps:

[0127] S10. Dehydrate and pulverize titanium gypsum;

[0128] S20. After the converter steel slag is hot-poured and slowly cooled, it is crushed, ground and magnetically separated to remove iron, so as to form steel slag tailings.

[0129] S30. Steel slag tailings, crushed titanium gypsum, titanium extraction tailings and sintering machine head ash are mixed to obtain solid waste mine remediation soil.

[0130] In this embodiment of the invention, the titanium gypsum after dehydration and pulverization has a particle size of less than 2 mm and a moisture content of less than 3%.

[0131] In this embodiment of the invention, the steel slag tailings have a particle size of less than 5 mm and a moisture content of less than 3%.

[0132] In this embodiment of the invention, the titanium extraction tailings have a particle size of less than 0.5 mm and a moisture content of less than 3%.

[0133] In this embodiment of the invention, the particle size of the sintering machine head ash is less than 0.1 mm and the moisture content is less than 1%.

[0134] Furthermore, the solid waste mine remediation soil obtained in step S30 is subjected to granulation treatment to obtain granules of 5-20mm, which can be used as a planting substrate for flowers and green plants.

[0135] Example 6

[0136] A solid waste mine remediation soil comprises the following raw materials by weight: 65% titanium gypsum, 25% converter steel slag, 6% titanium extraction tailings, and 4% sintering machine head ash.

[0137] Titanium gypsum is obtained from the sulfuric acid process for producing titanium dioxide.

[0138] The titanium gypsum comprises the following raw material composition by weight (w%): CaO 28-30%, SO3 34-36%, Fe2O3 6-9%, TiO2 3-4%, Al2O3 3-4%, MgO 1-2%, and SiO2 4-6%.

[0139] The converter slag is obtained by smelting high, medium and low carbon steel in a converter.

[0140] The converter slag comprises the following raw material composition by weight (w%): P 0.5-1.5%, CaO 34-36%, MgO 10-15%, Fe2O3 20-30%, SiO2 10-13%, Al2O3 1-3%, and f-CaO 5-8%.

[0141] The titanium extraction tailings are obtained by extracting titanium from high-titanium blast furnace slag.

[0142] The titanium extraction tailings comprises the following raw material composition by weight (w%): CaO 25-30%, SiO2 24-26%, Al2O3 12-14%, MgO 7-9%, TiO2 5-8%, C 3-6%, and Cl 2.5-4.5%.

[0143] The sintering machine head ash is the fly ash after dust removal in the sintering machine.

[0144] The sintering machine head ash comprises the following raw material composition by weight (w%): K2O 12-15%, TFe 25-35%, Cl 6-22%, and S 1-4%.

[0145] A method for preparing soil for the remediation of solid waste mines includes the following steps:

[0146] S10. Dehydrate and pulverize titanium gypsum;

[0147] S20. After the converter steel slag is hot-poured and slowly cooled, it is crushed, ground and magnetically separated to remove iron, so as to form steel slag tailings.

[0148] S30. Steel slag tailings, crushed titanium gypsum, titanium extraction tailings and sintering machine head ash are mixed to obtain solid waste mine remediation soil.

[0149] In this embodiment of the invention, the titanium gypsum after dehydration and pulverization has a particle size of less than 2 mm and a moisture content of less than 3%.

[0150] In this embodiment of the invention, the steel slag tailings have a particle size of less than 5 mm and a moisture content of less than 3%.

[0151] In this embodiment of the invention, the titanium extraction tailings have a particle size of less than 0.5 mm and a moisture content of less than 3%.

[0152] In this embodiment of the invention, the particle size of the sintering machine head ash is less than 0.1 mm and the moisture content is less than 1%.

[0153] Furthermore, the solid waste mine remediation soil obtained in step S30 is subjected to granulation treatment to obtain granules of 5-20mm, which can be used as a planting substrate for flowers and green plants.

[0154] Example 7

[0155] A solid waste mine remediation soil comprises the following raw materials in the indicated weight percentages: 65% titanium gypsum, 22.5% converter steel slag, 10% titanium extraction tailings, and 2.5% sintering machine head ash.

[0156] Titanium gypsum is obtained from the sulfuric acid process for producing titanium dioxide.

[0157] The titanium gypsum comprises the following raw material composition by weight (w%): CaO 28-30%, SO3 34-36%, Fe2O3 6-9%, TiO2 3-4%, Al2O3 3-4%, MgO 1-2%, and SiO2 4-6%.

[0158] The converter slag is obtained by smelting high, medium and low carbon steel in a converter.

[0159] The converter slag comprises the following raw material composition by weight (w%): P 0.5-1.5%, CaO 34-36%, MgO 10-15%, Fe2O3 20-30%, SiO2 10-13%, Al2O3 1-3%, and f-CaO 5-8%.

[0160] The titanium extraction tailings are obtained by extracting titanium from high-titanium blast furnace slag.

[0161] The titanium extraction tailings comprises the following raw material composition by weight (w%): CaO 25-30%, SiO2 24-26%, Al2O3 12-14%, MgO 7-9%, TiO2 5-8%, C 3-6%, and Cl 2.5-4.5%.

[0162] The sintering machine head ash is the fly ash after dust removal in the sintering machine.

[0163] The sintering machine head ash comprises the following raw material composition by weight (w%): K2O 12-15%, TFe 25-35%, Cl 6-22%, and S 1-4%.

[0164] A method for preparing soil for the remediation of solid waste mines includes the following steps:

[0165] S10. Dehydrate and pulverize titanium gypsum;

[0166] S20. After the converter steel slag is hot-poured and slowly cooled, it is crushed, ground and magnetically separated to remove iron, so as to form steel slag tailings.

[0167] S30. Steel slag tailings, crushed titanium gypsum, titanium extraction tailings and sintering machine head ash are mixed to obtain solid waste mine remediation soil.

[0168] In this embodiment of the invention, the titanium gypsum after dehydration and pulverization has a particle size of less than 2 mm and a moisture content of less than 3%.

[0169] In this embodiment of the invention, the steel slag tailings have a particle size of less than 5 mm and a moisture content of less than 3%.

[0170] In this embodiment of the invention, the titanium extraction tailings have a particle size of less than 0.5 mm and a moisture content of less than 3%.

[0171] In this embodiment of the invention, the particle size of the sintering machine head ash is less than 0.1 mm and the moisture content is less than 1%.

[0172] Furthermore, the solid waste mine remediation soil obtained in step S30 is subjected to granulation treatment to obtain granules of 5-20mm, which can be used as a planting substrate for flowers and green plants.

[0173] Performance testing

[0174] Examples 1-5 were prepared into 70mm×70mm×70mm test blocks, which were cured for 28 days at 20℃ and 75% humidity. The strength properties of the test blocks were tested, and the planting effect was also tested. The specific planting effects are shown in Table 1:

[0175] Table 1. Planting effects in Examples 1-5

[0176]

[0177] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A total solid waste mine restoration soil, characterized by, The all-solid-waste mine-repairing soil is used for planting matrix of flowers and plants, and comprises the following raw material components in weight percentage: titanium gypsum 50-80%, converter steel slag 15-30%, titanium extraction tailings 5-15%, and sintering machine head ash 0-5%, wherein The titanium gypsum comprises the following raw material components in weight percentage: CaO 28-30%, SO3 34-36%, Fe2O3 6-9%, TiO2 3-4%, Al2O3 3-4%, MgO 1-2%, and SiO2 4-6%. The converter steel slag comprises the following raw material components in weight percentage: P 0.5-1.5%, CaO 34-36%, MgO 10-15%, Fe2O3 20-30%, SiO2 10-13%, Al2O3 1-3%, and f-CaO 5-8%. The titanium extraction tailings comprise the following raw material components in weight percentage: CaO 25-30%, SiO2 24-26%, Al2O3 12-14%, MgO 7-9%, TiO2 5-8%, C 3-6%, and Cl 2.5-4.5%. The sintering machine head ash comprises the following raw material components in weight percentage: K2O 12-15%, TFe 25-35%, Cl 6-22%, and S 1-4%.

2. The total solid waste mine remediation soil according to claim 1, characterized in that, The all-solid-waste mine-repairing soil comprises the following raw material components in weight percentage: titanium gypsum 60-75%, converter steel slag 20-25%, titanium extraction tailings 8-10%, and sintering machine head ash 2-4%.

3. The total solid waste mine remediation soil of claim 1, wherein, The all-solid-waste mine-repairing soil comprises the following raw material components in weight percentage: titanium gypsum 65%, converter steel slag 22.5%, titanium extraction tailings 10%, and sintering machine head ash 2.5%.

4. A method of preparing a full-solid waste mine remediation soil according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: S10, dehydrating and crushing the titanium gypsum; S20, after slow cooling, multi-stage crushing, grinding and magnetic separation of the converter steel slag tailings to remove iron to form steel slag tailings; S30, mixing the steel slag tailings, the crushed titanium gypsum, the titanium extraction tailings and the sintering machine head ash to obtain the all-solid-waste mine-repairing soil.

5. The method of claim 4, wherein the full-solid waste mine remediation soil is prepared by mixing the full-solid waste with the soil. The particle size of the dehydrated and crushed titanium gypsum is less than 2 mm, and the water content is less than 3%.

6. The method of claim 4, wherein the full-solid waste mine remediation soil is prepared by mixing the full-solid waste with the soil. The particle size of the steel slag tailings is less than 5 mm, and the water content is less than 3%.

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