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| Ribeiro,Fabiana Rodrigues; Egreja Filho,Fernando Barboza; Fabris,José Domingos; Mussel,Wagner da Nova; Novais,Roberto Ferreira. |
| The industrial refining of kaolin involves the removal of iron oxides and hydroxides along with other impurities that cause discoloration of the final product and depreciate its commercial value, particularly undesirable if destined to the paper industry. The chemical leaching in the industrial processing requires treatments with sodium hyposulfite, metallic zinc, or sulfuric and phosphoric acids, in order to reduce, dissolve and remove ferruginous compounds. To mitigate the environmental impact, the acidic effluent from the leaching process must be neutralized, usually with calcium oxide. The resulting solid residue contains phosphorous, zinc, and calcium, among other essential nutrients for plant growth, suggesting its use as a macro and micronutrient... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Industrial residue; Fertilizer; Kaolin refining. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832007000500011 |
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| Vettorazzo,S. C.; Amaral,F. C. S.; Chitolina,J. C.. |
| This experiment was carried out under greenhouse conditions with soil pots during 210 days, to evaluate the effect of calcitic papermill lime-sludge application (at the rates 0, 773, 1.547, and 2.320 mg kg-1 or respective equivalents to control, 2, 4, and 6 t ha-1), on chemical composition of soil leachate and its effects on eucalypt growth and yield. Highest soil leachate pH, SO4, and Na concentrations occurred in the 4 and 6 t ha-1 treatments. Soil leachate nitrate concentrations decreased with increasing lime-sludge rate. Soil leachate phosphate remained low (below the detection limit) in all treatments until 120 days, while the concentration increased in the lime-sludge treatments at 210 days (last sampling) in about 600 mg L-1. Lime-sludge decreased... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalypt; Industrial residue; Soil fertility; Mineral nutrition; Sodium; Recycling. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832001000300025 |
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| Lima,Maria Lúcia Pereira; Simili,Flávia Fernanda; Medeiros,Maria Izabel Merino de; Balieiro Neto,Geraldo; Ribeiro,Enilson Geraldo; Paz,Claudia Cristina Paro de. |
| Two sugarcane varieties (IAC86-2480 and IAC91-2195) combined or not with soybean hulls (SH), partially replacing corn in concentrate, were included in the diet of crossbred dairy cows to evaluate the effects on feed intake, milk production, milk composition and rumen parameters of crossbred cows. The sugarcane varieties (IAC86-2480 and IAC91-2195) and concentrate compositions (with and without SH) were analyzed in a 2 × 2 factorial arrangement. Treatments were assigned to blocks by lactation period to evaluate feed intake, milk production and milk composition. A Latin square design was used to analyze rumen parameters. Feed intake, milk production and composition were similar among treatments. Average daily feed intake was 19.93 kg DM in cows fed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: By-product; Industrial residue; Roughage; Soybean residue. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014001200654 |
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