Method for preparing yellow phosphorus by low or middle grade phosphorus ore

A phosphate rock, low-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of great negative impact on the ecological environment, unusable slag and phosphorus-containing wastewater, and high power consumption, etc., to achieve The effect of reducing production cost, saving electric energy and avoiding pollution

Inactive Publication Date: 2009-09-16
昆明隆青化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electric furnace method requires high-grade phosphate rock as a raw material; a large amount of electricity is consumed in the production process; at the same time, a large amount of slag and phosphorus-containing wastewater are produced and cannot be used, which has a great negative impact on the ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Use phosphate rock with a phosphorus pentoxide content of 22% as a raw material, add 5% sulfur as a mineralizer in the raw material; then, mix the prepared material, silica, and coke in a weight ratio of 5.6:3:1, and grind Powder to 200 mesh, homogenize, add high-quality clay as binder, make ellipsoidal raw material pellets, pellet size 10mm×8mm×6mm, and dry. The dried raw material pellets are put into the shaft kiln with an elevator, preheated to 1150°C, enter the reduction section, and the temperature is raised to 1250°C, and the phosphorus vapor is drawn out with an induced draft fan. After gravity sedimentation and dust removal, the temperature is lowered in two stages and separated to obtain the The required yellow phosphorus products; the carbon monoxide hot gas generated is recovered for drying raw material pellets; the generated slag is used as cement clinker. The reduction rate of phosphorus is 92%, the total recovery rate is 81%, and the quality of the product...

Embodiment 2

[0025] Repeat Example 1 with the following differences: the phosphorus pentoxide content of the raw material is 18%, 2% fluorine is added as a mineralizer in the raw material, clay is added as a binder, preheated to 1100°C, and then heated to 1240°C . The reduction rate of phosphorus was 90%, and the total recovery rate was 8%.

Embodiment 3

[0027] Repeat Example 1, with the following differences: the phosphorus pentoxide content of the raw material is 14%, add 10% sulfur as a mineralizer in the raw material, add clay as a binder, preheat to 1200 ° C, and heat up to 1270 ° C . The reduction rate of phosphorus was 94%, and the total recovery rate was 83%.

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PUM

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Abstract

The invention discloses a method for preparing yellow phosphorus by low or middle grade phosphorus ore, aiming at solving the technical problem that the prior art consumes much electric power, has high demand on the grade of raw material and exerts great negative effect on the ecological environment. In the invention, a vertical kiln is used as the production equipment; the content of phosphorus pentoxide in phosphorus ore is lower than 25%, 2-10% of mineralizer is added to the raw material. The method comprises the following steps; the materiel, silica, coke are mixed according to the weight proportion of 5.6:3:1, the mixture is ground to powder of 200 meshes and is homogenized; cementing agent is added to the mixture for preparing the mixture into an axiolitic raw material pellet, the pellet is dried; then the pellet is placed in the vertical kiln to be preheated to 1100 DEG C to 1200 DEG C; the pellet enters a reducing phase, and when the temperature is raised to 1240 DEG C to 1270 DEG C, phosphorus steam is led out by an induced draught fan; after dust abatement through gravitational settling, the temperature is reduced by two phases and separation is carried out to obtain the needed yellow phosphorus product; the produced carbon monoxide hot gas is used for drying the pellet and the produced slag is used as cement clinker.

Description

technical field [0001] The invention relates to the technical field of yellow phosphorus production, more specifically, the invention relates to a method for preparing yellow phosphorus by using medium and low-grade phosphate rocks. Background technique [0002] Yellow phosphorus (also known as white phosphorus) is one of the allotropes of phosphorus, which is a colorless to pale yellow waxy solid. It is mainly used to make fertilizers, and is also used to make phosphoric acid, fireworks, matches, pesticides and detergents, etc. It has important and extensive uses in human life. [0003] So far, the common method of producing yellow phosphorus is the electric furnace method, that is, phosphate rock is reduced in an electric furnace to produce phosphorus vapor under high temperature conditions to obtain high-quality yellow phosphorus. However, the electric furnace method requires high-grade phosphate rock as a raw material; the production process consumes a lot of electricit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/027C04B7/14
CPCY02P40/10
Inventor 车建青曾繁端程梅华
Owner 昆明隆青化工有限公司
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