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Kiln method for producing phosphoric acid and light aggregate

A lightweight aggregate and phosphoric acid technology, applied in the direction of phosphoric acid, phosphorus oxyacid, etc., to achieve the effects of reducing damage, obvious economic and social benefits, and strong practicability

Active Publication Date: 2017-03-22
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides a pellet with a reducing agent core composed of a carbonaceous reducing agent and a binder, which is mainly composed of phosphate rock, siliceous or calcareous raw materials, and pore-forming materials, which meet the needs of kiln phosphoric acid production. , and the pellets can be co-produced with the kiln-based phosphoric acid at the same time as lightweight aggregates suitable for the preparation of lightweight concrete, and effectively solve the problem of carbon burning of ordinary pellets in the existing kiln-based phosphoric acid process, so as to achieve high Under the premise of the reduction rate of phosphate rock and the disposal and utilization of residual balls, it provides a new idea for the development and utilization of a large number of low-grade phosphate rock resources in my country.

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  • Kiln method for producing phosphoric acid and light aggregate
  • Kiln method for producing phosphoric acid and light aggregate
  • Kiln method for producing phosphoric acid and light aggregate

Examples

Experimental program
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Embodiment 1

[0062] A method for kiln-process phosphoric acid co-production of lightweight aggregate, comprising the following steps:

[0063] a. Raw material pretreatment: crush the phosphate rock and put it into the grinding mill to make the particle size D 50 Phosphate rock powder ≤25μm; the calcium raw material and carbonaceous reducing agent are put into the mill for grinding, and the particle size is D 50 Calcium raw material powder ≤60μm, and carbonaceous reducing agent powder; the pore-forming material is crushed to make a particle size of D 50 Pore-forming material powder ≤80μm;

[0064] The calcium raw material is limestone powder or quicklime;

[0065] b. Ingredients: take raw carbonaceous reducing agent powder, binder, phosphate rock powder, calcareous raw material powder, and pore-forming material powder, and set aside;

[0066] The amount of the carbonaceous reductant powder is measured by the effective carbon (C) in the carbonaceous reductant powder, and the consumption o...

Embodiment 2

[0087] A method for kiln-process phosphoric acid co-production of lightweight aggregate, comprising the following steps:

[0088] a. Raw material pretreatment: crush the phosphate rock and put it into the grinding mill to make the particle size D 50 Phosphate rock powder ≤25μm; the calcium raw material and carbonaceous reducing agent are put into the mill for grinding, and the particle size is D 50 Calcium raw material powder ≤60μm, and carbonaceous reducing agent powder; the pore-forming material is crushed to make a particle size of D 50 Pore-forming material powder ≤80μm;

[0089] The calcium raw material is limestone powder or quicklime;

[0090] b. Ingredients: take raw carbonaceous reducing agent powder, binder, phosphate rock powder, calcareous raw material powder, and pore-forming material powder, and set aside;

[0091] The amount of the carbonaceous reductant powder is measured by the effective carbon (C) in the carbonaceous reductant powder, and the consumption o...

Embodiment 3

[0111] A method for kiln-process phosphoric acid co-production of lightweight aggregate, comprising the following steps:

[0112] a. Raw material pretreatment: crush the phosphate rock and put it into the grinding mill to make the particle size D 50 Phosphate rock powder ≤25μm; the calcium raw material and carbonaceous reducing agent are put into the mill for grinding, and the particle size is D 50 Calcium raw material powder ≤60μm, and carbonaceous reducing agent powder; the pore-forming material is crushed to make a particle size of D 50 Pore-forming material powder ≤80μm;

[0113] The calcium raw material is limestone powder or quicklime;

[0114] b. Ingredients: take raw carbonaceous reducing agent powder, binder, phosphate rock powder, calcareous raw material powder, and pore-forming material powder, and set aside;

[0115] The amount of the carbonaceous reductant powder is measured by the effective carbon (C) in the carbonaceous reductant powder, and the consumption o...

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Abstract

The invention discloses a kiln method for producing phosphoric acid and light aggregate. The method is characterized by comprising the following steps: raw material pretreatment: preparing the following raw materials: carbon reducing agent powder, an adhesive, phosphate ore powder, silicon raw material powder / calcium raw material powder, and pore forming material powder; adding carbon reducing agent powder and the adhesive into a pelletizer, mixing, and sieving, wherein the oversize product is the produced reducing agent cores; adding the reducing agent cores, phosphate ore powder, silicon raw material powder / calcium raw material powder, and pore forming material powder into the pelletizer, mixing to prepare green pellets with an outer reaction layer; delivering the green pellets to a kiln, calcining the green pellets at a constant temperature, naturally cooling to obtain light aggregate, and burning the gas from the kiln to prepare phosphoric acid. The provided method can produce phosphoric acid and light aggregate for preparing concrete, effectively solves the problem of carbon loss in the conventional kiln method for producing phosphoric acid, effectively overcomes the problem that a large amount of slag is hard to process, and is very practical.

Description

technical field [0001] The invention belongs to the preparation method of phosphorus compound and the utilization method of waste, and relates to a method for kiln-process phosphoric acid co-production of lightweight aggregate. The invention is particularly suitable for preparing phosphoric acid in a kiln method using medium and low-grade phosphate rock as raw material, and simultaneously obtaining lightweight aggregate suitable for preparing (light) concrete in the field of building materials. Background technique [0002] In recent years, with the rapid development of my country's economy, the increasing demand for energy and the improvement of environmental protection awareness, energy conservation and environmental protection issues have become the focus of attention. At the same time, my country's phosphate rock resource reserves rank second in the world, but there are few high-grade phosphate rock resources and most low-grade phosphate rock resources. As an important ...

Claims

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Application Information

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IPC IPC(8): C01B25/18C01B25/20C04B18/02
CPCC01B25/18C01B25/20C04B18/027
Inventor 严云肖博胡志华
Owner SOUTHWEAT UNIV OF SCI & TECH
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