Method for preparing baking-free brick from yellow phosphorus slag and modified phosphogypsum
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A technology of phosphogypsum and yellow phosphorus slag is applied in the field of non-burning bricks, which can solve the problems of high cost, unfavorable industrial production, long brick curing time, etc., and achieves the effects of good quality, high utilization rate and shortened production cycle.
Inactive Publication Date: 2011-02-16
KUNMING UNIV OF SCI & TECH
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The disadvantage of this method is that the cost of using high-alumina cement and alumina stone powder as the binder is relatively high, and secondly, the curing time of the adobe is long, which is not conducive to industrial production
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Embodiment 1
[0044] Crush 75% of yellow phosphorus slag, 25% of modified phosphogypsum, and 8% of sand (percentage by weight) until the particle size is less than 3mm, then add 5% of cement and 7% of water for mixing, high-pressure molding, demoulding, 60-80 ℃ steam curing, and finally the performance test of the product. Among them, the steam curing time is about 6 to 8 hours.
[0045] The measured product performance is as follows:
[0046] Compressive strength 10.6Mpa;
[0047] Flexural strength 2.7Mpa;
[0048] Meet the requirements of the standard "JC422-1991 (1996) non-fired ordinary bricks".
Embodiment 2
[0050] After pulverizing 72% of yellow phosphorus slag, 28% of modified phosphogypsum, and 5% of sand (percentage by weight) to a particle size of less than 3mm, add 5% of cement and 8% of water to mix and stir. Other procedures are the same as in Example 1.
[0051] The measured product performance is as follows:
[0052] Compressive strength 10.8Mpa;
[0053] Flexural strength 2.3Mpa;
[0054] Meet the requirements of the standard "JC422-1991 (1996) non-fired ordinary bricks".
Embodiment 3
[0056]68% of yellow phosphorus slag, 32% of modified phosphogypsum, and 10% of sand (percentage by weight) were pulverized to a particle size of less than 3mm, then mixed with 3% of cement and 10% of water for mixing. Other procedures were the same as in Example 1.
[0057] The measured product performance is as follows:
[0058] Compressive strength 10.2Mpa;
[0059] Flexural strength 2.3Mpa;
[0060] It meets the requirements of the standard "JC422-1991 (1996) non-fired common brick".
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Abstract
The invention provides a baking-free brick prepared by using yellow phosphorus slag and modified phosphogypsum as raw materials and a preparation method thereof. The industrial waste yellow phosphorus slag and the modified phosphogypsum are used as basic raw materials, sand and cement are added into the raw materials, and the mixture in a weight ratio is prepared into a finished product by processes of crushing, proportioning, mixing, stirring, high-pressure shaping, stripping, steam curing and the like. A large amount of yellow phosphorus slag discharged by the yellow phosphorus industry and a large amount of phosphogypsum discharged by the phosphoric acid industry are comprehensively utilized, and meanwhile, various environmental pollutions caused by long-term stacking of the yellow phosphorus slag and the phosphogypsum are reduced. The baking-free brick prepared from the yellow phosphorus slag and the phosphogypsum has the advantages of high utilization rate of industrial waste slag, high consumption, simple production process, short production period, low cost, environmental protection and energy conservation; and the brick meets the national standard requirements for baking-free common bricks, and is a novel environment-friendly building material. The steam curing is performed on the formed brick blank so as to shorten the curing time, improve the compressive flexural performance of the brick and facilitate large-batch production.
Description
technical field [0001] The invention relates to a method for preparing non-fired bricks by using yellow phosphorus slag and modified phosphogypsum as raw materials. Background technique [0002] The land area of our country is decreasing year by year, and the land resources are becoming more and more scarce. Since the production of clay bricks will consume a large amount of non-renewable land resources, it is no longer in line with the industrial policy. Therefore, my country banned the production of clay solid bricks in 2000. Various bricks for building materials that use fly ash, carbide slag, foundry steel slag, sandstone, etc. as alternative raw materials have emerged as the times require. [0003] Phosphogypsum is a by-product produced in the wet-process phosphoric acid production process, the main component is CaSO 4 2H 2 O, in addition to a small amount of F, P 2 o 5 、Al 2 o 3 , Fe 2 o 3 and organic matter etc. Phosphogypsum is mainly used in the preparatio...
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