CN113695361A - Chlorine-containing titanium extraction slag, chloride ion curing method thereof and method for preparing engineering material - Google Patents

Chlorine-containing titanium extraction slag, chloride ion curing method thereof and method for preparing engineering material Download PDF

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CN113695361A
CN113695361A CN202111014127.5A CN202111014127A CN113695361A CN 113695361 A CN113695361 A CN 113695361A CN 202111014127 A CN202111014127 A CN 202111014127A CN 113695361 A CN113695361 A CN 113695361A
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chlorine
slag
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CN113695361B (en
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唐颂
孙红娟
彭同江
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Southwest University of Science and Technology
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    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
    • C09K17/06—Calcium compounds, e.g. lime
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Abstract

The invention provides chlorine-containing titanium extraction slag, a chloride ion curing method thereof and a method for preparing engineering materials. The method may comprise the steps of: firstly, heating and drying chlorine-containing titanium-extracting slag to obtain constant-weight chlorine-containing titanium-extracting slag dry slag, measuring the water content of the chlorine-containing titanium-extracting slag dry slag, uniformly stirring the chlorine-containing titanium-extracting slag, a chloride ion curing agent and an auxiliary agent to obtain a mixture, finally adding water into the mixture to adjust the water content of the mixture, and uniformly stirring the mixture to obtain the excitation material cured chlorine-containing titanium-extracting slag. The invention solves the problem of comprehensive utilization of titanium slag with higher chlorine content.

Description

Chlorine-containing titanium extraction slag, chloride ion curing method thereof and method for preparing engineering material
Technical Field
The invention relates to the field of resource utilization of solid wastes, in particular to a method for solidifying chlorine-containing titanium-extracting slag by using an alkali-activated material, the chlorine-containing titanium-extracting slag for solidifying chloride ions by using the method and a method for preparing engineering materials by using the chlorine-containing titanium-extracting slag.
Background
The steel climbing adopts a high-temperature carbonization-low-temperature selective chlorination process to extract titanium, and important progress and good effect are achieved. But because the process has a low-temperature chlorination link, a large amount of chlorine-containing titanium extraction slag is generated. At present, stockpiling is taken as a main point, a large amount of land resources are occupied, meanwhile, potential pollution hidden dangers are caused to the surrounding environment, great economic, environmental protection and social pressure are caused to the enterprise, and how to treat and utilize the chlorine-containing titanium extraction slag becomes a difficult problem to be solved urgently in aspects of sustainable development, environmental protection and the like of the titanium extraction process.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to solve one of the problems in the prior art described above. For example, one of the objectives of the present invention is to provide a method for solidifying chlorine-containing titanium-extracting slag by using alkali-activated materials, so as to realize the resource utilization of the chlorine-containing titanium-extracting slag.
In order to achieve the aim, the invention provides a method for solidifying chloride ions in chlorine-containing titanium-extracting slag by using an alkali-activated material, which comprises the following steps: drying the chlorine-containing titanium-extracting slag to obtain constant-weight chlorine-containing titanium-extracting slag dry slag, and measuring the water content of the chlorine-containing titanium-extracting slag dry slag; uniformly stirring and mixing the chlorine-containing titanium slag, the chloride ion curing agent and the auxiliary agent to obtain a mixture; and adding water into the mixture to adjust the water content of the mixture, and continuously stirring uniformly to obtain the alkali-activated material solidified chlorine-containing titanium extraction slag.
Optionally, based on the total mass of the chlorine titanium-extracting slag dry slag, the chloride ion curing agent and the auxiliary agent, the mass percentage of the chlorine titanium-extracting slag dry slag can be 50-94%, the mass percentage of the chloride ion curing agent can be 6-30%, the mass percentage of the auxiliary agent can be less than or equal to 20%, the sum of the mass percentages of the chlorine titanium-extracting slag dry slag, the chloride ion curing agent and the auxiliary agent can be 100%, and the addition amount of water can be 15-35% of the total mass of the chlorine titanium-extracting slag dry slag, the chloride ion curing agent and the auxiliary agent.
Optionally, the granularity of the chloride ion curing agent can be 150-400 meshes, and the 200-mesh-sieve passing rate of the chloride ion curing agent is not lower than 55%; the particle size of the auxiliary agent can be more than 150 meshes, the 200-mesh-sieve passing rate of the auxiliary agent is not less than 75%, and the 325-mesh-sieve passing rate of the auxiliary agent is not less than 35%.
Alternatively, the chloride ion curing agent may be one or more of calcium oxide, calcium hydroxide, and lightly calcined magnesium oxide.
Alternatively, the chloride ion curing agent may be selected from one or more of quicklime powder, slaked lime powder and light-burned magnesia powder, the quicklime powder being made of calcium quicklime or magnesium quicklime; wherein, the content of MgO + CaO in the calcareous quicklime is more than or equal to 75 percent, the content of MgO is less than or equal to 5 percent, and CO is calculated by mass percent2Content is less than or equal to 12 percent, SO3The content is less than or equal to 2 percent; the content of MgO + CaO in the magnesium quicklime is more than or equal to 80 percent, and CO is2Content is less than or equal to 7 percent, SO3The content is less than or equal to 2 percent.
Alternatively, the auxiliary agent can be an auxiliary cementing material rich in activated alumina, and the auxiliary agent can be one or more of fly ash, red mud, metakaolin and sodium metaaluminate.
Optionally, in the drying step, the heating device may include an electrothermal blowing drying oven, the heating temperature range may be 100-110 ℃, and the drying time may be greater than or equal to 2 hours.
Optionally, the mixture is not in a fluid plastic state after being uniformly stirred.
Optionally, the method may further comprise: compacting and molding by adopting a compacting machine.
Optionally, the chlorine content of the chlorine-containing titanium-extracting slag can be more than 2% and 7% by mass.
In another aspect of the invention, chlorine-containing titanium-extracting slag is provided, and chloride ions in the chlorine-containing titanium-extracting slag are solidified among layers of Fridel salt by the method.
The invention also provides a method for preparing engineering materials from chlorine-containing titanium-extracting slag, which comprises the step of solidifying chloride ions in the chlorine-containing titanium-extracting slag by adopting the method, wherein the chloride ion solidifying agent is selected from one or more of quicklime powder, slaked lime powder and light-burned magnesia powder, the quicklime powder is prepared from calcium quicklime or magnesium quicklime, and the contents of MgO and CaO in the calcium quicklime are more than or equal to 90 percent, the content of MgO is less than or equal to 5 percent and CO are calculated by mass percentage2Content is less than or equal to 4 percent, SO3The content is less than or equal to 2 percent, the content of MgO plus CaO in the magnesium quicklime is more than or equal to 85 percent, the content of MgO is less than or equal to 10 percent, and CO2Content is less than or equal to 7 percent, SO3The content is less than or equal to 2 percent.
Alternatively, the engineering material may be a building material or a road material.
Alternatively, the building material may be prepared by stirring with a stirrer.
Alternatively, road mixing may be carried out using a stabilized soil mixer when preparing the road material.
In summary, the beneficial effects of the present invention over the prior art include:
1) the chlorine-containing titanium-extracting slag and the auxiliary agent are industrial solid waste materials, and the chloride ion curing agent has low price and simple production process.
2) The chloride ion curing agent and the auxiliary agent are utilized to enable chloride ions to be cured between layers of the Friedel salt, so that the key problem in resource utilization of the chlorine-containing titanium extraction slag is solved, waste is turned into wealth, and industrial solid waste resources are recycled.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 illustrates phases of mineralizers treated by a method for solidifying chloride ions in chlorine-containing titanium slag with alkali-activated materials according to an exemplary embodiment of the present invention.
FIG. 2 shows the chloride ion cure rates of different age cements.
Figure 3 shows the solidified chloride ion phase.
Detailed Description
Hereinafter, a method for solidifying chloride ions in chlorine-containing titanium-containing slag by using an alkali-activated material, a chlorine-containing titanium-containing slag in which chloride ions are solidified by using the method, and a method for producing an engineering material using the chlorine-containing titanium-containing slag according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
In the application, the chlorine-containing titanium extraction slag is chlorine-containing low-titanium type industrial hazardous slag obtained by treating titanium-containing blast furnace slag through a high-temperature carbonization-low-temperature chlorination titanium extraction process. The chlorine-containing titanium-extracting slag has certain chemical reaction activity, the activity index of the chlorine-containing titanium-extracting slag is about 70 percent and is close to the activity standard of S75 slag, but the water-soluble chloride content is higher and is usually between 2 and 7 weight percent, the highest content can be more than 10 weight percent, and the chlorine content is far higher than the standard that the chlorine content in a cement admixture does not exceed 0.06 weight percent, so the chlorine-containing titanium-extracting slag cannot be directly used for cement and concrete admixtures like common blast furnace slag. At present, the titaniferous blast furnace slag is mainly stockpiled.
In an exemplary embodiment, the titanium chloride-containing slag may include the following components in parts by mass: 28-33% of CaO and 20-25% of SiO211 to 15% of Al2O32-7% of MgO and 2-10% of TiO22-4% of Fe2O3And 2-7% of Cl element.
In order to treat and utilize the chlorine-containing titanium-extracting slag, the invention provides an alkali-activated material for curing the chlorine-containing titanium-extracting slag, thereby solving the restriction that the chlorine-containing titanium-extracting slag is difficult to be recycled due to high chlorine content.
The preparation method comprises the following steps:
step 1: taking a representative sample of chlorine-containing titanium extraction slag (titanium extraction slag raw slag), heating and drying the chlorine-containing titanium extraction slag to obtain constant-weight chlorine-containing titanium extraction slag dry slag, and measuring the water content of the chlorine-containing titanium extraction slag dry slag.
For example, the chlorine-containing titanium-extracting slag can be dried in a drying oven at 105 +/-5 ℃ to a constant weight, wherein the basis for judging the constant weight is that the drying is continuously carried out for more than 2 hours at 105 +/-5 ℃ until the mass of the slag is not changed any more. For example, the drying can be carried out for more than 6 hours at the temperature of 105 +/-5 ℃ until the mass is constant. And (3) measuring the water content of the chlorine-containing titanium extraction slag dry slag for determining the later-period water consumption.
Step 2: and (3) uniformly stirring and mixing the chlorine-containing titanium extraction dry slag, the chloride ion curing agent and the auxiliary agent to obtain a mixture.
And (2) sequentially adding the chloride ion curing agent and the auxiliary agent into the titanium extraction dry slag, and uniformly stirring and mixing by adopting a stirring machine or equipment (when the rotating speed is 100 revolutions per minute, the stirring time is not less than 60s), wherein when the building material is prepared, the building material can be stirred by the stirring machine, when the road material is prepared, the road material can be stirred by adopting a stabilized soil stirring machine until the road material is uniformly observed visually, and the material is not obviously segregated.
The chloride ion curing agent can be one or more of calcium oxide, calcium hydroxide and light-burned magnesium. For example, the chloride ion curing agent can be one or a compound of two or more of quicklime powder, slaked lime powder and light-burned magnesium powder.
When quicklime powder is used, quicklime powder made of calcareous quicklime is preferable. When used for preparing engineering materials, the selected calcareous quicklime contains more than or equal to 90 percent of MgO plus CaO, less than or equal to 5 percent of MgO, and CO2≤4％，SO3The content is less than or equal to 2 percent. When the content of MgO and CaO is lower than 90%, the effective components of the curing agent are too low, the curing effect on chloride ions is reduced, and the strength of the prepared engineering material is also adversely affected, so that the content of MgO and CaO is more than or equal to 90%; when the content of MgO exceeds 5 percent, the volume of the prepared engineering material can expand, the service performance of the engineering material can be reduced, and when CO is contained, the volume of the engineering material can be expanded2If the content is more than 4 percent, the curing agent is over-burnt or under-burnt or carbonized, SO that the performance of the engineering material and the curing effect of chloride ions are reduced, and SO3The content is less than or equal to 2 percent.
The auxiliary agent can be an auxiliary gelled material rich in activated alumina. For example, the auxiliary agent may be selected from one or more of fly ash, red mud, metakaolin and sodium metaaluminate.
And step 3: and adding water into the mixture to adjust the water content of the mixture, and uniformly stirring the mixture to obtain the alkali-activated material solidified chlorine-containing titanium extraction slag.
Wherein, the ingredients and the mixture ratio related to the steps 2 and 3 are 6 to 30 percent of chloride ion curing agent, 50 to 94 percent of chlorine-containing titanium-extracting slag dry slag and less than or equal to 20 percent of auxiliary agent according to mass percentage. The water accounts for 15-35% of the dry weight of the solid. When compaction molding is adopted, the water amount is used for measuring a low value, otherwise, the water amount is used for measuring a high value. When the amount of the chloride ion curing agent is too small (e.g., less than 6%), the curing effect is not achieved, and when the amount of the chloride ion curing agent is too large (e.g., more than 30%), the curing cost is increased, so that there is a dose range of the chloride ion curing agent. When the proportion of the titanium extraction dry slag is too high (for example, more than 94%), the chloride ion curing effect is difficult to guarantee, and when the proportion of the titanium extraction dry slag is too high, the curing effect and the curing cost can be simultaneously considered. If the content of the auxiliary agent is too high (for example, more than 20%), the solidification cost is increased, and the quality of the solidified titanium-extracting slag is reduced, so that the optimal dosage range of the auxiliary agent is provided.
And (3) after curing in the step (3), when certain strength is required, compacting and molding to the required dry density by adopting a compacting machine, otherwise, only the mixed material is required to be not in a flow plastic state, and then curing for 3-7 d at normal temperature to realize high-efficiency curing of the chloride ions in the slag, wherein the total curing rate of the free chloride ions in the slag is not lower than 85%.
In one exemplary implementation, a method for alkali-activated solidification of climbing steel to extract chloride ions from titanium slag may include:
s1: the extracted titanium slag raw slag is dried to constant weight at 105 +/-5 ℃ by adopting an electrothermal blowing drying box, the water content of the titanium slag raw slag is measured and used for determining the water consumption in the later period, and the judgment basis of the constant weight is that the quality of the titanium slag raw slag is not changed any more after being continuously dried for 2 hours at the temperature of 105 +/-5 ℃.
S2: the chloride ion curing agent and the auxiliary agent are sequentially added into the titanium extraction slag, and are stirred and mixed uniformly by adopting a stirring machine or equipment (when the rotating speed is 100 revolutions per minute, the stirring time is not less than 60s), for example, when building materials are prepared, the materials can be stirred by a stirrer, when road materials are prepared, a stabilized soil mixer can be used for road stirring, and the materials are stirred until the visual inspection is uniform and the materials are not obviously separated.
S3: and adding water into the uniformly stirred titanium extraction slag, the chloride ion curing agent and the auxiliary agent mixed material until the required water content is reached, and continuously stirring and uniformly mixing. When certain strength is needed after curing, a compacting machine can be used for compacting and forming to the required dry density, otherwise, only the mixed material is required to be in a non-flow plastic state, then moisture preservation and curing are carried out for 3-7 days at normal temperature, effective curing of the chloride ions in the mixed material can be realized, the total curing rate of the free chloride ions is not less than 85%, and the highest curing rate can reach more than 90%.
According to another aspect of the invention, the chlorine-containing titanium-extracting slag treated by the method is provided, and chlorine ions in the chlorine-containing titanium-extracting slag are solidified among layers of Fridel salt after being treated by the method.
According to another aspect of the invention, a method for preparing engineering materials from chlorine-containing titanium-extracting slag is provided, the method comprises the step of solidifying chloride ions in the chlorine-containing titanium-extracting slag by adopting the method, the chloride ion solidifying agent is selected from one or more of quicklime powder, slaked lime powder and light-burned magnesia powder, the quicklime powder is made of calcium quicklime or magnesium quicklime, the MgO + CaO content in the calcium quicklime is more than or equal to 90%, the MgO content is less than or equal to 5%, and CO is prepared from MgO + CaO content in the calcium quicklime or magnesium quicklime2Content is less than or equal to 4 percent, SO3The content is less than or equal to 2 percent, the content of MgO plus CaO in the magnesium quicklime is more than or equal to 85 percent, the content of MgO is less than or equal to 10 percent, and CO2Content is less than or equal to 7 percent, SO3The content is less than or equal to 2 percent.
Alternatively, the engineering material may be a building material or a road material.
Alternatively, the building material may be prepared by stirring with a stirrer.
Alternatively, road mixing may be carried out using a stabilized soil mixer when preparing the road material.
In order to better understand the above exemplary embodiments of the present invention, the following describes a method for solidifying titanium chloride-containing slag by using alkali-activated materials in combination with specific examples.
Table 1 shows the main chemical components and contents of a certain batch of titanium slag.
TABLE 1 extraction of main chemical components and contents of titanium slag
CaO SiO2 Al2O3 TiO2 MgO Cl Fe2O3 SO3 F MnO K2O Na2O Others
32.83 24.69 14.14 8.17 6.44 6.39 3.67 1.3 0.97 0.66 0.27 0.26 0.21
In the examples, unconfined compressive strength was tested according to the test method T0805-1994 in Experimental protocols for inorganic bonding volume temperature materials for road engineering (JTG E51-2009).
The chloride ion curing rate is obtained by measuring the concentration of chloride ions in the leachate of the curing body and comparing the concentration with the total amount of the chloride ions, wherein the total amount of the chloride ions is obtained according to an XRF test, and the concentration of the chloride ions in the leachate is obtained according to a cement chemical analysis method (GB/T176-2017).
Example 1
The preparation method of the present example includes the steps of:
(1) and measuring the natural water content of the chlorine-containing titanium extraction slag to be 10 wt%.
(2) According to the mass percentage, 12 percent of quicklime powder, 2 percent of metakaolin and 88 percent of chlorine-containing titanium-extracting slag are placed in a stirrer to be stirred for 30s, and the rotating speed of a stirring blade is 120r/min, so that the materials are uniformly mixed.
(3) When the chlorine-containing titanium-extracting slag is used for road materials, firstly, the chlorine-containing titanium-extracting slag, dried metakaolin and quicklime powder are subjected to a standard compaction test, the optimal water content is measured to be 18%, and the maximum dry density is 1.72g/cm3Firstly, turning and stirring for more than 3 times by using a road mixer until the mixture is uniformly mixed without obvious white materials, then supplementing water according to 8 percent of the mixture, digesting for 3 hours, then turning and stirring for more than 3 times by using the road mixer until the mixture is uniformly mixed, then rolling by using a road roller according to a normal road construction method until the required compaction degree is reached, and then covering and preserving.
The compression strength of the formed or on-site core drilling H-D-50 mm cylindrical test piece without lateral limitation at the age of 7D is more than or equal to 3.5MPa, and the strength requirement of the road stabilized soil base layer material is met.
In this example, the maximum curing rate of chloride ions was not less than 85%.
Example 2
The preparation method of the present example includes the steps of:
(1) and measuring the natural water content of the chlorine-containing titanium extraction slag to be 8 wt%.
(2) According to the mass percentage, 22 percent of quicklime powder and 78 percent of chlorine-containing titanium-extracting slag are placed in a stirrer to be stirred for 40s, and the rotating speed of a stirring blade is 100r/min, so that the materials are uniformly mixed.
(3) When the chlorine-containing titanium-extracting slag is used for preparing the baking-free brick, firstly, the chlorine-containing titanium-extracting slag and quicklime powder are mixed, water is added to enable the water content of the mixed material to be 20%, the mixed material is formed under the pressure of 20-50 MPa, the mixed material is kept wet and is maintained at normal temperature to the age of 7d, and the unconfined compressive strength is more than or equal to 10 MPa. The highest curing rate of chloride ions of the obtained building material is not less than 85 percent.
Example 3
The procedure of this example is the same as example 2 except that the age is 3 d.
Example 4
The procedure of this example is the same as example 2 except that the age is 1 d.
Example 5
The preparation method of the present example includes the steps of:
(1) and measuring the natural water content of the chlorine-containing titanium extraction slag to be 12 percent.
(2) According to the mass percentage, 8 percent of quicklime powder, 10 percent of red mud powder and 82 percent of chlorine-containing titanium extraction slag are evenly mixed by a stirring machine, and then water is added to the mixed material to evenly mix the materials.
(3) Because the titanium extraction slag is mainly used for stacking, the raw slag of the titanium extraction slag, the red mud and the quicklime powder are mixed, water is added to ensure that the water content of the mixed material is 32%, the mixture is uniformly stacked, and the highest curing rate of chloride ions is not lower than 85%.
Example 6
The preparation method of the present example includes the steps of:
(1) and measuring the natural water content of the chlorine-containing titanium extraction slag to be 14 percent.
(2) According to the mass percentage, 14 percent of quicklime powder, 6 percent of sodium metaaluminate and titanium extraction slag are uniformly mixed, if a stable soil mixer is used, the mixture is not stirred for less than 3 times (one time for one time is regarded as 1 time), until no obvious segregation exists. When used for preparing building materials, the rotating speed of 60r/min is not less than 60 s.
(3) When the soil stabilizer is used for stabilizing soil, the mixed material is turned and stirred uniformly, water is supplemented to 18.6%, turning and stirring are continued for 3-5 times, after the water is uniform, a road roller is used for rolling to the specified compaction degree, and the soil stabilizer is covered with the mixture for moisture preservation and health preservation for 7 days. When the material is used for preparing building materials such as plates, bricks, building blocks and the like, water is added to the specified water content according to the mixture ratio, then the mixture is uniformly mixed, and then the mixture is subjected to static pressure forming in a mold under the pressure of 20-50 MPa, and the moisture preservation and the health preservation are carried out for 7 days at normal temperature. At this time, the curing rate of chloride ions was not less than 85%.
According to the method of the invention, the activated hydration product forms a Friedel's Salt (Friedel's Salt:3 CaO. A1)2O3·CaCl2·10H2O), carrying out mineralization and solidification on chloride ions in the titanium extraction slag, wherein the solidification mode of the chloride ions belongs to chemical combination. FIG. 1 shows the Friedel's salt morphology of the cured chloride ions in the cement after curing in example 2. the chloride ions are cured in the plate-like chloroaluminate as shown in FIG. 1.
Fig. 2 shows the cure rates for chloride ions of different ages as in examples 2 to 4. As can be seen from FIG. 2, the curing rate of chloride ions is continuously increased with the increasing age, the curing rate of chloride ions reaches about 50% at age 1d, the curing rate of chloride ions exceeds 70% at age 3d, and the curing rate of chloride ions reaches 87% at age 7 d.
Figure 3 shows the cured chloride friedel salt phase of example 4 and it can be seen from figure 3 that the friedel salt phase is present in the cement, which is the main reason for the curing of the chloride ions.
According to the method, the chemical reaction activity of the chlorine-containing titanium-extracting slag can be fully utilized, and the mineralization and solidification of chloride ions are realized by adopting alkali excitation, so that the problem of utilization of the chlorine-containing titanium-extracting slag is solved.
According to the invention, the chlorine ions in the waste water can be effectively cured, and the total curing rate of the free chlorine ions is not less than 85 percent and can reach more than 90 percent at most.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.

Claims (10)

1. A method for solidifying chloride ions in chlorine-containing titanium extraction slag by using alkali-activated materials is characterized by comprising the following steps:
drying the chlorine-containing titanium-extracting slag to obtain constant-weight chlorine-containing titanium-extracting slag dry slag, and measuring the water content of the chlorine-containing titanium-extracting slag dry slag;
uniformly stirring and mixing the chlorine-containing titanium slag, the chloride ion curing agent and the auxiliary agent to obtain a mixture; and adding water into the mixture to adjust the water content of the mixture, and continuously stirring uniformly to obtain the alkali-activated material solidified chlorine-containing titanium extraction slag.
2. The method for curing chloride ions in chlorine-containing titanium-extracting slag by using the alkali-activated material as claimed in claim 1, wherein the mass percentage of the chlorine-containing titanium-extracting slag dry slag, the mass percentage of the chloride ion curing agent and the mass percentage of the auxiliary agent are respectively 50-94%, 6-30%, 20% and 100%, and the addition amount of water is 15-35% of the total mass of the chlorine-containing titanium-extracting slag dry slag, the chloride ion curing agent and the auxiliary agent.
3. The method for curing chloride ions in chlorine-containing titanium extraction slag by using the alkali-activated material as claimed in claim 1, wherein the granularity of the chloride ion curing agent is 150-400 meshes, and the 200-mesh-sieve passing rate of the chloride ion curing agent is not less than 55%; the particle size of the auxiliary agent is more than 150 meshes, the 200-mesh-sieve passing rate of the auxiliary agent is not less than 75%, and the 325-mesh-sieve passing rate of the auxiliary agent is not less than 35%.
4. The method for solidifying chloride ions in chlorine-containing titanium extraction slag by using the alkali-activated material as claimed in claim 1, wherein the auxiliary agent is an auxiliary cementing material rich in activated alumina, and the auxiliary agent is one or more of fly ash, red mud, metakaolin and sodium metaaluminate.
5. The method for solidifying chloride ions in chlorine-containing titanium extraction slag by using the alkali-activated material as claimed in claim 1, wherein the drying step comprises the step that the heating equipment comprises an electrothermal blowing drying oven, the heating temperature is 100-110 ℃, and the drying time is not less than 2 h.
6. The method for solidifying chloride ions in chlorine-containing titanium-extracting slag by using alkali-activated materials as claimed in claim 1, wherein the chlorine content of the chlorine-containing titanium-extracting slag is more than 2% and 7% by mass.
7. The method for solidifying chloride ions in chlorine-containing titanium-extracting slag by using alkali-activated material according to claim 1, wherein the chloride ion solidifying agent is one or more of calcium oxide, calcium hydroxide and light-burned magnesium oxide, the chloride ion solidifying agent is one or more of quicklime powder, slaked lime powder and light-burned magnesium oxide powder, and the quicklime powder is made of calcium quicklime or magnesium quicklime; wherein, the content of MgO + CaO in the calcareous quicklime is more than or equal to 75 percent, the content of MgO is less than or equal to 5 percent, and CO is calculated by mass percent2Content is less than or equal to 12 percent, SO3The content is less than or equal to 2 percent; the content of MgO + CaO in the magnesium quicklime is more than or equal to 80 percent, and CO is2Content is less than or equal to 7 percent, SO3The content is less than or equal to 2 percent.
8. The chlorine-containing titanium extraction slag is characterized in that chloride ions in the chlorine-containing titanium extraction slag are solidified among layers of Fridel salt by the method according to any one of claims 1 to 7.
9. A method for preparing engineering materials from chlorine-containing titanium-extracting slag is characterized in that the method comprises the step of solidifying chlorine ions in the chlorine-containing titanium-extracting slag by adopting the method as claimed in any one of claims 1 to 6, wherein the chlorine ion solidifying agent is one or more selected from quicklime powder, slaked lime powder and light-burned magnesia powder, the quicklime powder is prepared from calcium quicklime or magnesium quicklime, and the contents of MgO and CaO in the calcium quicklime are more than or equal to 90 percent, the content of MgO is less than or equal to 5 percent and CO are calculated according to mass percentage2Content is less than or equal to 4 percent, SO3The content is less than or equal to 2 percent,the content of MgO + CaO in the magnesium quicklime is more than or equal to 85 percent, the content of MgO is less than or equal to 10 percent, and CO is2Content is less than or equal to 7 percent, SO3The content is less than or equal to 2 percent.
10. The method for preparing engineering material from chlorine-containing titanium-extracting slag according to claim 9, wherein the engineering material is building material or road material, and the building material is stirred by a stirrer during preparation; when preparing the road material, a stabilized soil mixer is adopted for road mixing.
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