Matrix material of baking-free bricks and preparation method of baking-free bricks

Abstract

The invention relates to a method for preparing baking-free bricks by use of waste oil sludge and desulfurized fly ash. A matrix material of the baking-free bricks is prepared from the following raw materials in percentage by weight: 5-20% of waste oil sludge, 1-15% of desulfurized fly ash, 10-25% of ordinary Portland cement, 25-30% of fly ash, 10-25% of superfine slag powder and 3-10% of a curing agent. The curing agent is prepared from the following raw materials in parts by weight: 5-10% of sodium silicate, 5-30% of magnesium oxide, 5-30% of green-vitriol, 0-30% of alum, 0-30% of aluminum sulfate and 5-15% of sodium phosphate. The preparation method of the baking-free bricks comprises the steps of evenly mixing the waste oil sludge with the desulfurized fly ash together and then standing, mixing the mixture with the curing agent, the ordinary Portland cement, the fly ash and the superfine slag powder, stirring, molding, and performing press and steam curing after demolding, thereby obtaining the baking-free bricks. The baking-free bricks can be prepared by effectively utilizing the desulfurized fly ash and the waste oil sludge, and therefore, the ecological environment can be protected and the resources can be saved.

Description

technical field [0001] The invention relates to a non-burning brick and a preparation method thereof, in particular to a method for preparing a non-burning brick by using waste oil sludge and desulfurization ash. Background technique [0002] Lubricating oil mainly plays the role of lubrication, heat dissipation, speed regulation, flushing, shock absorption, insulation and arc extinguishing, rust prevention, dust prevention, protection and sealing in equipment, and is widely used in steel rolling, machinery, electric power, transportation, chemical industry and other fields. During the use of lubricating oil, it is subjected to multiple effects such as temperature, pressure, air, dust, metal contact, etc., and will gradually oxidize and deteriorate until it becomes waste lubricating oil that cannot be used any longer. [0003] At present, the main whereabouts of waste lubricating oil in my country are: 1) Incineration, road oiling, used as release oil or directly discard...

AI Technical Summary

Problems solved by technology

It is estimated that a large barrel (200 L) of waste oil flows into the lake and sea, polluting nearly 3.5 km 2 The vast water surface of the water will damage the entire food chain, and the incineration of waste oil will produce harmful substances such as dioxin, sulfur and phosphorus organic matter, which can endanger humans through various channels; 2) Waste lubricating oil can be directly used as fuel after removing heavy metals (high-temperature furnace, cement kiln) or used as asphalt thinner, high-sulfur fuel blending raw materials, etc.; 3) After simple regeneration treatment (such as sedimentation, filtration), continue to be recycled; 4) Regeneration (re-refining), according to statistics, The recycling rate of waste lubricating oil in my country is less than 20% of the production volume, and the recycling technology is relatively backward, the process is simple and the scale is small, resulting in greater waste of resources and damage to the ecological environment

[0004] For the "three sludges" (scum, excess activated sludge, grease trap bottom sludge) of refineries, the common treatment and utilization methods are concentration and drying, incineration, biological treatment, solvent extraction, chemical heat washing treatment, fuel or building materials Utilization, physical treatment, stratum recharge, etc., such as CN 101234882A, CN101891452A and CN 1526680 A disclose a kind of use of oilfield sludge to make floor tiles and its production method, mainly adopting oilfield sludge to add a certain amount of cement and inorganic raw materials to Improve its strength and reduce the leaching of harmful substances, but the added raw materials are more and the cost is higher, which is not conducive to popularization; CN 1528530A In the method for preparing building blocks by sintering oilfield sludge, high-temperature sintering consumes a lot of energy, and incineration tail gas Unavoidable secondary pollution; CN 1683262A discloses a treatment method for waste crude oil sludge, which is to firstly heat, dissolve, settle and separate the crude oil sludge into dirty oil and sediment in a settling tank, and then dehydrate and distill the dirty oil , and sediment as coal raw materials; CN 1488591A and CN 102351389A dehydrate the oily sludge, then perform thermal extraction, and send the liquid phase to a coking device for treatment; CN 2392774Y adopts a catalytic coking device to process oily sediment, which can recycle more Distillate oil can also produce some petroleum coke; USP4666585 and USP4994169 take coking distillate oil and oily sludge to stir and mix to make oil slurry, which is sent to the coking feed inlet to allow oily sludge to be treated at high temperature, but oily sludge Due to the high water content, the amount of coking treatment is limited, which will affect the normal operation of the coking device; CN97118778.9 will pass through pre-dehydrated oily sludge through vacuum distillation to destroy the oil, water, and sludge formed in the oily sludge. Stabilize the system, steam out all the water and part of the oil in the sludge, so that the remaining oil and mud residue after vacuum distillation can be naturally settled and separated, and the latter can be used as fuel; CN 1669960A adopts the principle of extraction and two-way dilution, Forcibly separate the two phases of heavy oil sludge, and then recycle them separately. Finally, the bottom sludge is used as fuel; CN 1618538A heats and dehydrates the oily sludge and then carbonizes it. The colloidal asphalt in the sludge is partially condensed into coke, which is absorbed in the dry soil, and finally Landfill disposal; CN 10104154A The silt separated by two-stage centrifugation and sedimentation is sent to the incinerator after preliminary drying, but the operation is complicated, the equipment failure rate is high, and the energy consumption is high, so it is difficult to maintain long-term stable operation

[0005] Compared with the published technologies, it is found that because the oily sludge contains organic substances such as olefins, alkanes, aromatic hydrocarbons, cycloalkanes, colloids, and asphaltene, when incineration or fuelization is used, not only the incineration process requires combustion aids, but the incineration costs are high, and The toxic components in the sludge will be released in the form of gas, causing secondary pollution to the environment; the biological treatment cycle is long, the treatment capacity is small, the land occupation is large, and it is easily affected by the climate, so it is not suitable for high oily sludge; the cost of solvent extraction is high , the process is long, the extraction agent is mostly toxic organic solvent, the environment is harmful, and there are few successful cases of industrialization; the chemical heat washing treatment focuses on oil recovery, and it is more common in the recovery of sludge or oil sand with high oil content. It needs to be disposed of properly; although various physical fields such as ultrasonic waves, electromagnetic fields, electric fields, microwaves, and low-frequency pulse waves have some effects in heating, pyrolysis, viscosity reduction, demulsification, dehydration, and sterilization, the processing capacity is small and is still under research. stage; formation recharge is actually the transfer of pollutants, and the effectiveness of the disposal method needs to be further evaluated

[0006] In view of the above analysis, it is considered that the more appropriate way of rolling oil sludge is to use solidification technology to process building materials, but the existing technology, such as the brick material of CN 101143780A, uses clay and loess as base materials, which not only wastes natural mineral resources, but actually The amount of mixed oilfield sludge is also very limited; in addition, the current oily sludge solidification treatment process generally has the following disadvantages: 1) The amount of solidification agent is large, and it is often necessary to add a variety of coagulants, and the cost of the agent is high; 2) Solidification It takes a long time, and it usually takes 15-30 days to make the cured body reach a certain compressive strength; 3) The quality of the cured body is uneven, one is that the curing strength cannot meet the requirements of building bricks, and the other is that the leaching toxicity and radioactivity tests do not meet the requirements. Building Material Standards

The desulfurization ash has very fine particles, and it is easy to raise dust when stacked in the open air. It is highly alkaline and contains CaSO 4 2H 2 O, CaSO 3 1 / 2H 2 O, CaCO 3 , f-CaO and Ca(OH) 2 , and a variety of heavy metal elements that are enriched in cycles, the leaching toxicity is easy to exceed the standard, the chemical composition fluctuates greatly, and the content of unstable components is high, and it is easy to expand and burst when used in building materials

At present, the desulfurization ash has not yet found a proper way of large-scale utilization. Most of the desulfurization ash is piled up and discarded. The sky is full of dust in sunny days, and the sewage flows in rainy days, causing serious pollution to the environment. It has become a problem that flue gas desulfurization enterprises must face.

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