Planting sand prepared by utilizing sludge and a preparing method thereof

Abstract

The invention relates to planting sand prepared by utilizing sludge and a preparing method thereof. The planting sand is prepared from, by weight, 100 parts of solid waste, 15-30 parts of a pore forming agent, 5-15 parts of a plasticizer and 1-2.5 parts of a reinforcing agent, wherein the solid waste is one or more of fly ash, coal gangue, slag, tailings and waste residues, and the pore forming agent is one or more of household sludge, papermaking sludge and river sludge. The planting sand is prepared through mixing, granulation, drying, sintering and cooling steps. The prepared planting sandhas a uniform particle size, a high degree of sphericity, high cylinder compressive strength, and long service lifetime. The water absorption rate of the planting sand is 60-80%. The planting sand hasgood water retaining and fertilizer retaining properties, and water and fertilizers can be uniformly distributed.

Description

technical field [0001] The invention relates to the field of planting sand, in particular to planting sand prepared from sludge and a preparation method thereof. Background technique [0002] At present, common cultivation substrates other than soil include vermiculite, perlite, slag, peat, rock wool, etc. Among them, the vermiculite matrix is ​​easily broken, cannot be subjected to heavy pressure, and has a short service life; the perlite matrix is ​​too light, which easily causes dust pollution and is difficult to fix plants; the slag matrix is ​​easily polluted and needs to be crushed; peat is affected by the place of origin and cannot Large-scale use; the uneven structure of rock wool makes the distribution of water and fertilizer uneven. [0003] The patent with publication number CN103168638A proposes a kind of porous structure planting sand composed of natural sand grains and binder. The porous structure formed by the accumulation reduces the water and fertilizer re...

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Problems solved by technology

Among them, the vermiculite matrix is ​​easily broken, cannot be subjected to heavy pressure, and has a short service life; the perlite matrix is ​​too light, which easily causes dust pollution and is difficult to fix plants; the slag matrix is ​​easily polluted and needs to be crushed; peat is affected by the place of origin and cannot Large-scale use; the structure of rock wool is not balanced, making the distribution of water and fertilizer uneven

[0003] The patent with publication number CN103168638A proposes a kind of porous structure planting sand composed of natural sand grains and binder. The porous structure formed by the accumulation reduces the water and fertilizer retention efficiency of the planting sand structure; at the same time, the elements of the natural sand grains are relatively fixed, which cannot meet the specific element requirements of specific plant growth, which limits the popularization and application of planting sand

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