Results 271 to 280 of about 1,392,926 (349)

Uranium endowments in phosphate rock

Science of The Total Environment, 2014
This study seeks to identify and specify the components that make up the prospects of U recovery from phosphate rock. A systems approach is taken. The assessment includes i) reviewing past recovery experience and lessons learned; ii) identifying factors that determine recovery; and iii) establishing a contemporary evaluation of U endowments in ...
Andrea E, Ulrich, Ewald, Schnug, Horst-Michael, Prasser, Emmanuel, Frossard   +3 more
openaire   +2 more sources

Rock phosphate enriched compost: An approach to improve low-grade Indian rock phosphate

Bioresource Technology, 2006
In this study, rock phosphate enriched composts (RP-compost) were prepared by mixing four low-grade Indian rock phosphates with rice straw with and without Aspergillus awamori. RP-compost had higher total P, citrate soluble P (CSP), organic P (Org.P), acid and alkaline phosphatase activities, and lower water soluble P (WSP) and microbial biomass C (MBC)
D R, Biswas, G, Narayanasamy
openaire   +2 more sources

Co-Pyrolysis Biochar Derived from Rape Straw and Phosphate Rock: Carbon Retention, Aromaticity, and Pb Removal Capacity

Energy & Fuels, 2019
Biochar has been recognized as a promising tool for carbon sequestration and heavy metal removal from contaminated water. To promote the application of biochar in environment improvement, the effects of exogenous minerals on carbon sequestration and Pb ...
R. Gao, Qian Wang, Yonghong Liu, Jun Zhu, Youjun Deng, Q. Fu, Hongqing Hu   +6 more
semanticscholar   +1 more source

Phosphate rock solubilization and the potential for lead immobilization by a phosphate-solubilizing bacterium (Pseudomonas sp.)

Journal of Environmental Science and Health. Part A: Toxic/Hazardous Substances and Environmental Engineering, 2019
Lead (Pb) pollution is getting more and more serious in phosphate mining wastelands recently. However, seldom studies focused on the bioremediation of Pb pollution in phosphate mining wastelands by phosphate-solubilizing bacterium (PSB). In this study, a
Qi Wang, C. Xiao, B. Feng, R. Chi
semanticscholar   +1 more source

A demand-driven model for global phosphate rock suggests paths for phosphorus sustainability.

Environmental Science and Technology, 2019
Phosphorus is required for fertilizer for producing food, and there is no substitute. Losses between mine production and diet result in significant environmental harm.
D. Vaccari, S. Powers, Xin Liu
semanticscholar   +1 more source

Phosphate rock and phosphate rock/sulphur granules as phosphate fertilizers and their dissolution in soil

Fertilizer Research, 1987
A field trial was conducted for 3 years to evaluate phosphate rocks and phosphate rock/sulphur granules as fertilizers for permanent pastures. Two reactive phosphate rocks, North Carolina (USA) and Chatham Rise (New Zealand), and an unreactive Florida (USA) were used.
openaire   +1 more source

Phosphate supplying power of rock phosphates in an oxisol

Plant and Soil, 1980
The P-supplying power of triple superphosphate, three apatitic rock phospates and a calcined aluminum rock phosphate were tested by measuring the quantities of fertilizer P recovered in soybean and in four chemical extractants, after 3-day and 75-day periods of contact between soil and fertilizer.
van Raij, B., van Diest, A.
openaire   +2 more sources

Phosphate rocks and partially-acidulated phosphate rocks as controlled release P fertilizers

Fertilizer Research, 1993
Properties of phosphate rocks (PRs) and partially acidulated phosphate rocks (PAPRs) which affect the pattern of P dissolution and thus the potential for manipulating the rate of P release are reviewed. The effects of soil and plant properties are also considered.
J. Hagin, R. Harrison
openaire   +1 more source

Mussoorrie rock phosphate-pyrite mixture as phosphate fertilizer

Fertilizer Research, 1996
Mussoorrie rock phosphate (MRP), MRP + pyrite (25% by weight), diammonium phosphate (DAP), ammonium polyphosphate (APP) and nitrophosphate (NP) were compared in a field experiment as fertilizers for wheat. At 20 kg P ha−1, MRP was only 6 per cent as effective as DAP. However, when it was mixed with pyrite, the efficiency of MRP increased to 64 per cent
S. N. Sharma, R. Prasad
openaire   +1 more source

The agronomic effectiveness of reactive phosphate rocks 2. Effect of phosphate rock reactivity

Australian Journal of Experimental Agriculture, 1997
Summary. The chemical reactivity of apatite phosphate rock (PR) from Sechura (Bayovar), North Carolina, Egypt (Hamrawein), Morocco (Khouribja) and Queensland (Duchess), was estimated using the following methods (indices): percentage of the phosphorus (P) present in the PR that is soluble in one extraction with 2% citric acid and 2% formic acid, and ...
R. J. Gilkes, M. D. A. Bolland
openaire   +1 more source