Low and middle grade phosphate dump leaching method with compound bacterial strains and waste biomass being combined

A technology of waste biomass and heap leaching method, which is applied in the field of heap leaching of medium and low-grade phosphate rock with compound strains combined with waste biomass, which can solve the problems of inability to utilize phosphate-dissolving bacteria, and achieve reduced treatment costs, simple process flow, and low investment. low effect

Active Publication Date: 2020-04-28
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, biomass utilization usually requires pretreatment first, and after pretreatment, it still cannot be directly utilized by phosphate-dissolving bacteria.

Method used

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  • Low and middle grade phosphate dump leaching method with compound bacterial strains and waste biomass being combined

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] a) Biomass preparation: Weigh 0.05 kg of rice straw and crush it into 0.5 mm particles. Add rice straw granules to 2% NaOH aqueous solution and soak for 8 days, filter and wash with double-layer gauze after the time is up, until the pH of the supernatant is neutral, and dry the filter residue at 50°C to constant weight for later use .

[0034] b) Preparation of ore: Weigh 1 kg of phosphate rock (the mass content of phosphorus pentoxide is 23.75%), and crush it to 1mm to obtain phosphate rock powder.

[0035] c) Laying bottom mat: Lay high-strength polyethylene sheet at the selected leaching heap position as the heap leaching bottom mat, and at the same time dig a liquid collection ditch and a liquid collection pool at the bottom of the heap and its surroundings. The leaching heap should be selected in a flat area, and the site is required to have a certain slope (longitudinal inclination of 3%) so that the leachate can be collected and flowed out, but the slope should ...

Embodiment 2

[0044]a) Biomass preparation: 0.1 kg of rice straw was weighed and crushed into 0.1 mm particles. Add rice straw granules to 2% NaOH aqueous solution and soak for 8 days, filter and wash with double-layer gauze after the time is up, until the pH of the supernatant is neutral, and dry the filter residue at 50°C to constant weight for later use .

[0045] b) Preparation of ore: Weigh 2kg of phosphate rock (the mass content of phosphorus pentoxide is 23.75%), and crush it to 1mm to obtain phosphate rock powder.

[0046] c) Laying bottom mat: Lay high-strength polyethylene sheet at the selected leaching heap position as the heap leaching bottom mat, and at the same time dig a liquid collection ditch and a liquid collection pool at the bottom of the heap and its surroundings. The selection and setting requirements of the heap leaching site are the same as those in Example 1.

[0047] d) Mixing: uniformly mixing the phosphate rock powder in step b) and the pretreated rice straw pa...

Embodiment 3

[0055] a) Biomass preparation: 0.15 kg of rice straw was weighed and crushed into 1 mm particles. Add rice straw granules to 2% NaOH aqueous solution and soak for 8 days, filter and wash with double-layer gauze after the time is up, until the pH of the supernatant is neutral, and dry the filter residue at 50°C to constant weight for later use .

[0056] b) Preparation of ore: Weigh 3kg of phosphate rock (the mass content of phosphorus pentoxide is 23.75%), and crush it to 1mm to obtain phosphate rock powder.

[0057] c) Laying bottom mat: Lay high-strength polyethylene sheet at the selected leaching heap position as the heap leaching bottom mat, and at the same time dig a liquid collection ditch and a liquid collection pool at the bottom of the heap and its surroundings. The selection and setting requirements of the heap leaching site are the same as those in Example 1.

[0058] d) Mixing: uniformly mixing the phosphate rock powder in step b) and the pretreated rice straw pa...

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Abstract

The invention relates to a low and middle grade phosphate dump leaching method with compound bacterial strains and waste biomass being combined. The method includes the steps that low and middle gradephosphate and the waste biomass are subjected to mixed dump leaching after being crushed to be made into powder according to the characteristics of the low and middle grade phosphate and the waste biomass, and a compound bacterial solution is sprayed; cellulose degradation bacteria in the compound bacterial solution are used for decomposing the waste biomass, and a carbon source capable of beingutilized directly is provided for heterotrophic phosphate-solubilizing bacteria in the compound bacterial solution; and then the heterotrophic phosphate-solubilizing bacteria are used for dissolving the low and middle grade phosphate, and finally low-cost large-batch development and utilization of the low and middle grade phosphate can be realized. The low and middle grade phosphate dump leachingmethod has the various advantages that processing capacity is high, environmental protection is achieved, cost is low and the technological process is simple. The leaching rate of phosphorus (phosphorus pentoxide) in the low and middle grade phosphate can reach 58% or above after dump leaching lasts for nine months.

Description

technical field [0001] The invention relates to the technical field of development and utilization of phosphate rock resources and recycling of waste biomass, in particular to a method for heap leaching of low- and medium-grade phosphate rock using compound bacterial strains combined with waste biomass. Background technique [0002] China is one of the largest agricultural producers in the world, generating more than 800 million metric tons of residual straw every year. The waste biomass that exists in large quantities is a huge and available energy source, among which rice straw, wheat straw, corn straw, peanut straw, soybean straw, and rapeseed straw are common and abundant agricultural residues, which are difficult to process Utilization often can only be incinerated, which not only causes pollution to the atmospheric environment, but also causes a great waste of biomass resources, hindering the sustainable development of modern agriculture. Obviously, the full developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C12N1/20C12N1/14C12N1/02C12R1/38C12R1/885
CPCB09B3/00B09B5/00C12N1/02C12N1/14C12N1/20Y02W30/78
Inventor 肖春桥周闫池汝安
Owner WUHAN INSTITUTE OF TECHNOLOGY
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