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Industrial waste in the production process of unburned brick have aggregate effect. Many industrial waste can be used to produce unburned bricks , including : power plant fly ash , steel plant slag , non-ferrous metal smelters smelting slag , all kinds of mining tailings , copper carbon , chemical waste gypsum , chemical lime , construction waste brick , construction waste etc. Chemical composition , mineral composition, hazardous substances and take advantage of the positive side effects of various industrial wastes are not the same, so when the use of industrial waste produced unburned bricks , after analyzing characteristics of the various waste , formation mechanism based on its strength, to develop a reasonable formula. Some industrial waste, after adding an appropriate amount of curing agent and additives, can be used to make separate unburned bricks : Such as the use of fly ash , add river sand and lime, gypsum, cement and composite admixture to produce 28d strength of 31MPa of industrial waste unburned bricks; Again , after pretreatment lead and zinc tailings, adding the right amount cement and admixture, manufacture of industrial waste is not less than MU10 unburned. And most of the studies is to some industrial waste with each other, or the merits of the complementary strengths to take advantage of synergies: good example now more is to combine the manufacture unburned bricks of fly ash and slag , the active ingredient in the fly ash and slag is excitated under the effect of a curing agent and admixture , bricks are met strength requirements. Ash material diameter is relatively small, single brick aggregate effect of the lack of large particles.The slag has a larger particle size distribution, to meet this condition, thereby producing the unburned better performance, such as the use of fly ash and slag Steel manufactured MU10-MU15 of unburned. In determining the industrial waste unburned formula, only to waste as much as possible to improve the content, but should be possible to use a variety of waste itself is conducive to the production of unburned features to reduce as much as possible agents and admixtures an amount, effective to reduce the production cost of the bricks. The main chemical production of industrial waste residue of unburned more common minerals.
In addition, some industrial waste due to radioactive, or should not be used in a lot of brick, its use should be preceded by radioactive detection. Some industrial waste such as fly ash, must be pretreated before use, remove roots and debris, and some also need to need to use abrasive material diameter rear; Again converter steel slag discharged, you must first go through magnetic separation, excluding the massive steel block, then by wet milling grinding to the desired particle size.
Waste particle size determines whether the production of industrial waste unburned add an additional aggregate. In the batch of industrial waste unburned, mixing with the appropriate amount of aggregate particle size prevents brick layers, reduce shrinkage, improve performance exhaust brick molding, increasing density, thereby increasing the strength of brick and durability, and can save the amount of binder, and reduce costs.
There are river sand as an aggregate of sand, sand and sand hill three kinds. Due to the mountain of sand with sharp edges, can better integrate and cement, leaving the brick has a high strength to listen to, so choose a good mountain sand. But most of the sand can be used in building materials, can be used for the production of industrial waste unburned. In fact, some waste itself has a role in the aggregate, such as steel mills produced steel slag, coal gangue, tailings and other mining.
1.2 Curing agent
Industrial waste unburned curing agent is the cementing material can form a variety of materials dispersed in the role of physics, chemistry, solid form with a certain intensity, such as cement, lime, gypsum, etc.
1.2.1 Cement
Cement in the production of industrial waste unburned, both cementing agent, but also activators. The initial strength of the brick-and post-effective three-dicalcium silicate and calcium silicate component contributed greatly. Generally used in high alkalinity 32.5 ordinary portland cement. The more amount of cement, the more beneficial to industrial waste unburned durability; But with the increasing amount of cement, the cost will increase as bricks. To reduce costs, many manufacturers try to use proper industrial waste or by the action of admixture with each other, under the premise to ensure the strength of the brick, as little as possible so as not to add to the cement. As in the use of red mud and fly ash manufacturing unburned just add some alkaline activator and sulfate activator, the strength of the brick can reach MU15 more.
1.2.2 lime
Lime slaking calcium hydroxide, early strength cement and late strength has an important role, it is also industrial waste unburned forming binders binders and alkaline activator. But some technology, especially in the late steam curing requires the use of industrial waste unburned, the use of hydrated lime can simplify the process and reduce the time spent in the factory brick, brick shorten turnaround time and capital.
1.2.3 gypsum
Gypsum is the production of industrial waste unburned sulfate activator, while its ability to synergies and lime, plays a role in promoting agent, on the strength of industrial waste unburned plays the role of direct and indirect. General use of natural gypsum better, of course, in order to reduce costs, you can also use industrial chemical gypsum, such as industrial phosphogypsum.
In the industrial production of unburned waste, the curing agents may be used, such as cement. And in most cases, as the case may be used in combination of several curing agents, such as the use of a combination of lime and gypsum, or gypsum, lime and cement used together, the effect is good. Of course, the application of industrial waste unburned curing agent is far more than the above three kinds, and some sulfate and the like. Meanwhile, some industrial waste (such as caustic sludge, etc.) may also be in the batch of bricks, act as agents to stimulate action.
1.3 Admixture
Pastes can make use of industrial waste outside agent to improve strength, improve performance, quality and stability. There are many additives for industrial waste unburned are: plasticizers ( ie water reducer ) , early strength agent, antifreeze agents. Unburned material mixed with industrial waste uniformity will directly affect the ultimate strength of brick. Generally, in order to improve mixing of the batch , in addition to strengthening the stirring , the added reducing agent effective to increase the fluidity of the material with substantial reduction of mixing water , so as to improve the density of brick , strength, frost , impermeability , etc. there is also a result of improved ; the other hand, due to the dispersion of water-reducing agent , such that each material contact surface area increases, thus contributing to improve the reaction probability. The production of industrial waste unburned , incorporated superplasticizer mostly hydrophilic surface active substances , commonly used lignin , such as calcium lignosulfonate . Early strength agent is to improve the early strength admixture products , whether inorganic salts, organic salts, or inorganic - organic compound early strength agent , they have to rely on speed to accelerate batch of hydration to improve the early strength of brick. Use more early strength agent sodium chloride , calcium chloride , triethanolamine, sulfur acid amine salt compound early strength agent.
2.Unburned brick production process of industrial waste
Precautions production as follows:
(1) If you are using a dry material, the amount of water to be added in the grinding wheel; If the compound itself contains water, as the case may add less water.
(2) aging or not, as the case may be, the general use of lime as a curing agent needs to aging, but you can avoid the use of hydrated lime aging process.
(3) if necessary, add water and cement should be added before molding.
Impact.
(4) the amount of water, pressure molding process parameters on the brick strength is relatively large, the corresponding parameters are determined through testing.
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Description of Ice Bucket
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