Tar residue molding binder composition, method of preparation and use thereof

Abstract

The present application relates to the technical field of coal chemical industry, and discloses a tar residue forming binder composition, a preparation method and application thereof, the raw materials of the composition include, in mass parts, 35-60 parts of bentonite, 10-15 parts of sodium silicate, 5-10 parts of nano calcium carbonate, 25-40 parts of organic adhesive, and 0.5-1 parts of water-soluble organic polymer; the preparation method of the composition includes the following steps: after the bentonite, the organic adhesive, the amide, the sodium silicate and the nano calcium carbonate are uniformly mixed, the mixture is transferred into a crushing device for crushing and sieving to obtain the tar residue forming binder composition; the composition is a multi-component mixture dry powder, the raw materials of which are environmentally friendly, widely sourced and low in cost; the composition can be applied to tar residue forming to significantly increase the structural strength of the formed tar residue, significantly reduce the volume of the formed tar residue and reduce the amount of the composition used; in addition, the preparation method of the composition is simple, the composition can be directly produced on a large scale, and has great potential for industrialization and popularization.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coal chemical industry, and particularly relates to a tar residue forming binder composition, a preparation method and application thereof. BACKGROUND

[0002] China is the largest coal producing country in the world, and oil and natural gas are increasingly scarce today. It is of great strategic significance to implement clean and high value-added conversion and processing utilization of coal resources. However, a large amount of by-products and waste are produced in the process of coal consumption and utilization, and tar residue is one of the waste. The tar residue mainly contains coke powder, coal dust, coal tar, asphalt and the like. The tar residue is complex in composition and mainly contains benzene series, polycyclic aromatic hydrocarbons, nitrogen-containing and sulfur-containing heterocyclic compounds, heavy metals and various pollutants. At present, it is listed as HW11 hazardous waste by the state. With the continuous expansion and rapid development of coal chemical industry, the amount of tar residue produced is also increasing. If the enterprises cannot timely treat and utilize the large amount of tar residue produced in the production process and randomly stack and discard the tar residue, a large amount of tar residue will not only occupy a large stacking space and bring storage burden to the enterprises, but also cause serious pollution to the surrounding environment. Therefore, reasonable treatment and secondary recycling of the tar residue have become one of the problems to be solved by the coal chemical enterprises.

[0003] The tar residue has a black muddy sand appearance with a pungent odor, and has certain viscosity. During the transportation and treatment process, the material is prone to spilling and tilting, and there are problems such as transportation difficulty and safety hazard, which brings many inconveniences. At present, the effective solution to the above problems is tar residue adhesive forming. The tar residue adhesive forming is to solidify and form the tar residue by using a forming binder. In order to control the cost, the components of the commonly used tar residue forming binder at present are relatively single, mainly inorganic fillers and binders. However, the single-component tar residue forming binder has the problems of low bonding performance, large amount of use and large volume of formed tar residue in the use process, which leads to the problems of easy disintegration of the formed tar residue, large storage space and the like in the subsequent tar residue transportation and storage process. SUMMARY

[0004] In order to overcome the problems of low bonding performance, large amount of use and large volume of formed tar residue of the single-component tar residue forming binder in the prior art, the application provides a tar residue forming binder composition, a preparation method and application thereof. The composition is a multi-component composition, and contains bentonite, sodium silicate, nano calcium carbonate, an organic adhesive and a water-soluble organic polymer in the raw materials. The combination can significantly enhance the structural strength of the formed tar residue and significantly reduce the volume after use. The amount of the composition used is small, and the cost is low.

[0005] The specific technical scheme of the application is as follows.

[0006] A tar residue forming binder composition, raw materials of which include, by mass fraction: bentonite 35-60 parts, sodium silicate 10-15 parts, nano calcium carbonate 5-10 parts, organic adhesive 25-40 parts, water-soluble organic polymer 0.5-1 part.

[0007] The tar residue forming binder composition provided by the present application has the following effects: the bentonite has the effects of wide source, low cost and improved thermal stability of the formed product; the bentonite contains alkali metal, carbonate, hydroxide and other components which can react with sulfur in the tar residue to play a role in sulfur fixation; the sodium silicate can increase the mechanical strength of the solid; the organic adhesive is pregelatinized natural starch which has the technical effects of wide source, low cost, environmental protection, no pollution, high viscosity, stable performance, rapid dispersion and thickening upon contact with water; the water-soluble organic polymer is polyacrylamide which can enhance the viscosity and consistency; the nano calcium carbonate has the effects of good dispersibility and increased colloid viscosity; the composition can significantly increase the structural strength and significantly reduce the volume of the formed tar residue in the process of forming the tar residue, and the amount of the composition is smaller than that of a single-component tar residue forming binder; the raw materials of the tar residue binder composition of the present application have wide sources and low cost, are environmentally friendly and have no pollution, and have high value in industrialization and popularization.

[0008] Preferably, the bentonite includes one or both of calcium-based bentonite and sodium-based bentonite.

[0009] Preferably, the organic adhesive includes one or more of pregelatinized corn starch, pregelatinized tapioca starch and pregelatinized wheat starch.

[0010] Preferably, the water-soluble organic polymer includes polyacrylamide.

[0011] Preferably, the polyacrylamide has a molecular weight of 5 million to 12 million.

[0012] Preferably, the sodium silicate is instant sodium silicate.

[0013] Preferably, the instant sodium silicate has a modulus of 2 to 3.

[0014] Preferably, the nano calcium carbonate has a particle size of 10 to 100 nm.

[0015] A preparation method of the above-mentioned tar residue forming binder composition, characterized by comprising the following steps: mixing the bentonite, the organic adhesive, the amide, the sodium silicate and the nano calcium carbonate uniformly, then crushing and sieving in a crushing device to obtain the tar residue forming binder composition.

[0016] The tar residue forming binder composition provided by the present application is a mixture of dry powders, and the preparation method thereof is simple in process and can be directly mass-produced in industry.

[0017] A tar residue forming adhesive composition and its method of preparation and application in tar residue forming.

[0018] Compared with the prior art, the present application has the following technical effects:

[0019] (1) The tar residue forming adhesive composition provided by the present application is a multi-component mixture dry powder. The composition can significantly increase the structural strength of the formed tar residue and significantly reduce the volume of the formed tar residue when applied in tar residue forming, and the amount of the composition used is small.

[0020] (2) The preparation method of the tar residue forming adhesive composition provided by the present application is simple, can be directly mass-produced, and has great potential for industrialization and popularization. DETAILED DESCRIPTION

[0021] The present application will be further described below in conjunction with examples.

[0022] Example 1

[0023] A tar residue forming adhesive composition, the raw materials of which include, by mass fraction: calcium-based bentonite 48.4 parts, pre-gelatinized cassava starch 30 parts, polyacrylamide 0.6 parts, sodium silicate 12 parts, nano calcium carbonate 9 parts, the particle size of the nano calcium carbonate is 100 nm, the modulus of the sodium silicate is 2, and the molecular weight of the polyacrylamide is 8 million;

[0024] A preparation method of the above-mentioned tar residue forming adhesive composition, comprising the following steps: weighing bentonite, organic adhesive, amide, sodium silicate and nano calcium carbonate as raw materials, mixing the above-mentioned raw materials uniformly in a stirrer, then crushing them in a crushing device, and sieving the crushed composition through a 100-mesh screen to obtain the tar residue forming adhesive composition;

[0025] An application method of the above-mentioned tar residue forming adhesive composition, comprising the following steps: mixing the tar residue forming adhesive composition with water to prepare a tar residue forming adhesive, and adding the tar residue forming adhesive into tar residue to mix and dry to obtain formed tar residue.

[0026] Example 2

[0027] A tar residue forming adhesive composition, the raw materials of which include, by mass fraction: calcium-based bentonite 54.2 parts, pre-gelatinized cassava starch 25 parts, polyacrylamide 0.8 parts, sodium silicate 14 parts, nano calcium carbonate 9 parts, the particle size of the nano calcium carbonate is 60 nm, the modulus of the sodium silicate is 2, and the molecular weight of the polyacrylamide is 5 million;

[0028] A preparation method of the tar residue forming binder composition, comprising the following steps: taking bentonite, organic adhesive, amide, sodium silicate and nano calcium carbonate as raw materials, mixing the raw materials in a stirrer, crushing the mixed raw materials in a crushing device, and sieving the crushed composition through a 100 mesh screen to obtain the tar residue forming binder composition.

[0029] An application method of the tar residue forming binder composition, comprising the following steps: mixing the tar residue forming binder composition with water to obtain a tar residue forming binder, and adding the tar residue forming binder into tar residue to obtain a formed tar residue.

[0030] Example 3:

[0031] A tar residue forming binder composition, raw materials including, by mass fraction: calcium-based bentonite 39.4 parts, pre-gelatinized cassava starch 40 parts, polyacrylamide 0.6 parts, sodium silicate 12 parts, nano calcium carbonate 8 parts, the particle size of the nano calcium carbonate is 30 nm, the modulus of the sodium silicate is 3, and the molecular weight of the polyacrylamide is 12 million.

[0032] A preparation method of the tar residue forming binder composition, comprising the following steps: taking bentonite, organic adhesive, amide, sodium silicate and nano calcium carbonate as raw materials, mixing the raw materials in a stirrer, crushing the mixed raw materials in a crushing device, and sieving the crushed composition through a 100 mesh screen to obtain the tar residue forming binder composition.

[0033] An application method of the tar residue forming binder composition, comprising the following steps: mixing the tar residue forming binder composition with water to obtain a tar residue forming binder, and adding the tar residue forming binder into tar residue to obtain a formed tar residue.

[0034] Example 4:

[0035] A tar residue forming binder composition, raw materials including, by mass fraction: calcium-based bentonite 55.4 parts, pre-gelatinized cassava starch 27 parts, polyacrylamide 0.6 parts, sodium silicate 11 parts, nano calcium carbonate 6 parts, the particle size of the nano calcium carbonate is 10 nm, the modulus of the sodium silicate is 2, and the molecular weight of the polyacrylamide is 8 million.

[0036] A preparation method of the tar residue forming binder composition, comprising the following steps: taking bentonite, organic adhesive, amide, sodium silicate and nano calcium carbonate as raw materials, mixing the raw materials in a stirrer, crushing the mixed raw materials in a crushing device, and sieving the crushed composition through a 100 mesh screen to obtain the tar residue forming binder composition.

[0037] A method for using the tar residue molding binder composition, comprising the following steps: mixing the tar residue molding binder composition with water to form a tar residue molding binder, and adding the tar residue molding binder into the tar residue to mix and dry to obtain the molded tar residue.

[0038] Comparative Example 1

[0039] Comparative Example 1 and Example 1, the raw material of the tar residue molding binder composition is calcium bentonite and pregelatinized cassava starch, and the rest of the conditions are the same as those of Example 1.

[0040] Comparative Example 2

[0041] Comparative Example 2 and Example 1, the raw material of the tar residue molding binder composition does not add polyacrylamide, and the rest of the conditions are the same as those of Example 1.

[0042] Comparative Example 3

[0043] Comparative Example 3 and Example 1, the raw material of the tar residue molding binder composition does not add sodium silicate, and the rest of the conditions are the same as those of Example 1.

[0044] Comparative Example 4

[0045] Comparative Example 4 and Example 1, the raw material of the tar residue molding binder composition does not add nano calcium carbonate, and the rest of the conditions are the same as those of Example 1.

[0046] Comparative Example 5

[0047] Comparative Example 4 and Example 1, the raw material of the tar residue molding binder composition is replaced by silica powder, and the rest of the conditions are the same as those of Example 1.

[0048] Detection Example

[0049] The mechanical properties of the tar residue molding binder and the molded tar residue prepared in the above Examples 1-4 are tested, and the viscosity of the tar residue molding binder is tested by a viscometer.

[0050] The performance test indexes of the molded tar residue include particle size, mass, microhardness and crushing strength, the microhardness is tested by MT / T264-1991 Coal Microhardness Test Method, and the crushing strength is tested by GB / T15459-1995 Coal Crushing Strength Test Method, and the test results are shown in Table 1.

[0051] Table 1 Mechanical properties of tar residue molding binder and molded tar residue

[0052] Viscosity (mPa-s) Particle size (mm) Mass (g) Microhardness (N / mm 2 ) Crushing strength (%) Example 1 352 26 16 33 94 Example 2 388 27 17 28 93 Example 3 391 25 17 31 92 Example 4 342 28 18 25 93 Comparative Example 1 194 43 33 10 69 Comparative Example 2 225 34 20 13 74 Comparative Example 3 335 30 16 17 76 Comparative Example 4 280 32 18 22 85 Comparative Example 5 311 28 12 17 74

[0053] As shown in Table 1, the calcium bentonite and the pre-gelatinized cassava starch used in Comparative Example 1 are relatively single in components, and compared with Example 1, the particle size is larger, the density is smaller, and the volume is larger under the condition of the same mass, and the microhardness and the crushing strength of Comparative Example 1 are significantly lower than those of Example 1. The above results show that when the tar residue forming binder composition provided by the present application and the single-component tar residue forming binder are applied to the tar residue forming, the volume of the formed tar residue per unit mass can be significantly reduced, the storage space is reduced, and the hardness and the crushing strength of the tar residue are significantly increased, and the transportation efficiency is improved.

[0054] In Comparative Example 2, no polyacrylamide is added, and it is found from the comparison of the viscosity that the viscosity of the tar residue forming binder of Comparative Example 2 is significantly lower than that of Example 1, which shows that the polyacrylamide can thicken and increase the viscosity of the tar residue forming binder, which is helpful for the rapid forming of the tar residue. In Comparative Example 3, no sodium silicate is added, and it is found from the comparison of the microhardness and the crushing strength that the microhardness and the crushing strength of Comparative Example 3 are significantly lower than those of Example 1, and the particle size of the formed tar residue under the condition of the same mass is larger than that of Example 1, which shows that the sodium silicate can enhance the structural strength of the formed tar residue and increase the density of the formed tar residue. In Comparative Example 4, no nano calcium carbonate is added, and the microhardness and the crushing strength of Comparative Example 4 are slightly lower than those of Example 1, and the particle size of the formed tar residue under the condition of the same mass is significantly larger than that of Example 1, which shows that the nano calcium carbonate cooperates with the sodium silicate to improve the structural strength and the crushing strength of the formed tar residue to a certain extent, significantly increases the density of the formed tar residue, reduces the volume of the formed tar residue under the condition of the same mass, and further improves the viscosity of the tar residue forming binder and the rapid forming performance of the tar residue.

[0055] In Comparative Example 5, the calcium bentonite is replaced by silica powder, and it is found from the detection of the sulfide gas in the forming process of Comparative Example 5 and Example 1 (the detection method is sodium hydroxide absorption method) that more sulfide gas is generated in Comparative Example 5, and no sulfide gas is generated in Example 1. The above results show that the calcium bentonite can play a role in sulfur fixation during use, so that the sulfide in the tar residue cannot be discharged, and the effect of environmental protection and pollution reduction is achieved.

[0056] The above is only a preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change and equivalent transformation of the above embodiment according to the technical essence of the present application still belongs to the protection scope of the technical solution of the present application.

Claims

1. A method for using a tar residue briquetting binder composition in tar residue briquetting, characterized in that, The tar residue molding binder composition is mixed with water to form a tar residue molding binder, the tar residue molding binder is added to the tar residue and mixed and dried to obtain the molded tar residue, and the raw materials of the tar residue molding binder composition include, by mass fraction, 35-60 parts of calcium-based bentonite, 10-15 parts of sodium silicate, 5-10 parts of nano calcium carbonate, 25-40 parts of pregelatinized cassava starch, and 0.5-1 part of polyacrylamide.

2. The method of claim 1, wherein, The polyacrylamide has a molecular weight of 5-12 million.

3. The method of claim 1 wherein, The sodium silicate is instant sodium silicate.

4. The method according to claim 1 or 3, characterized in that, The sodium silicate has a modulus of 2-3.

5. The method of claim 1 wherein, The nano calcium carbonate has a particle size of 10-100 nm.

6. The method of claim 1 wherein, The step of preparing the tar residue molding binder composition includes: uniformly mixing the calcium-based bentonite, the pregelatinized cassava starch, the polyacrylamide, the sodium silicate and the nano calcium carbonate, crushing them in a crushing device and sieving to obtain the tar residue molding binder composition.

7. The method of claim 6, wherein, The sieving uses a 100-mesh sieve.