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Method for producing cement additive with industrial residue phosphogypsum

A technology for cement additives and industrial waste residues is applied in the field of production of cement additives, which can solve the problem of high granulation cost, and achieve the effects of reducing storage yard land, low energy consumption, and reducing pollution.

Inactive Publication Date: 2009-07-29
林孝均
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To make the particle size and water content meet the requirements of cement additives, the cost of granulation is high (accounting for more than 60% of the market value of additives)

Method used

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  • Method for producing cement additive with industrial residue phosphogypsum
  • Method for producing cement additive with industrial residue phosphogypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 11

[0023] Select Examples 2-10 for batching, and the production process is shown in Figure 1.

[0024] The phosphogypsum used is the acid-insoluble matter produced by decomposing phosphate rock with sulfuric acid (especially the dihydrate method). A small amount of undecomposed phosphate rock and the main component of dihydrate gypsum account for more than 70% of the phosphogypsum particle size of 80-250 mesh. The original moisture content is 25-30%, and it is naturally air-dried after stacking. The water content is adjusted at 9-11%, and the phosphogypsum powder is mixed with the binder, and then it is dry-pressed by a roller granulator, and the particle size is 10-30mm (other fine powders are returned to the ingredients). Landing is not less than 10mm.

[0025] The granulator used is an existing roller press granulator. The roller surface has a die (also can be a groove stripe), and the die size is large or small, and the shape is different. , The grooved stripes are extruded...

Embodiment 1

[0027] Select embodiment 1, batching has no binding agent.

[0028] The phosphogypsum used is the acid-insoluble matter produced by decomposing phosphate rock with sulfuric acid (especially the dihydrate method). A small amount of undecomposed phosphate rock and the main component of dihydrate gypsum account for more than 70% of the phosphogypsum particle size of 80-250 mesh. The original moisture content is 25-30%, and it is naturally air-dried after stacking. The water content is adjusted at 9-11%, and the phosphogypsum is directly compressed into a particle size of 10-30mm through a roller press granulator. Others are the same as in Example 11.

[0029] The chemical composition of phosphogypsum used in the present invention consists of:

[0030] CaO (calcium oxide) 30.83% SO 3 (sulfur trioxide) 43.48%

[0031] Fe 2 o 3 (Fe2O3) 0.29% AL 2 o 3 (Al2O3) 0.18%

[0032] MgO (magnesium oxide) 1.29% P 2 o 5 (phosphorus pentoxide) 1.29%

[0033] P 2 o 5水溶 ...

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Abstract

The invention discloses a method for producing a cement additive by using industrial phosphogypsum waste slag. The method comprises the following steps: purifying and treating phosphogypsum, regulating the moisture and the fineness of the phosphogypsum to a definite range (the content of the phosphogypsum is between 6 and 15 percent, and the phosphogypsum with a granularity of between 80 and 250 meshes accounts for more than 70 percent), and dry-pelletizing the phosphogypsum by a roll type pelletizing machine under the match of adhesive to produce the cement additive of which the granularity and the performance accord with requirements of the cement. The cement additive produced by the method has the advantages of low energy consumption, low cost and high quality, can replace natural gypsum as the cement additive, reduce pollution of the waste slag to environment, and has remarkable economic benefit and social benefit.

Description

technical field [0001] The invention relates to additives for cement production, in particular to a method for producing cement additives using industrial waste phosphogypsum as raw material. Background technique [0002] Production of Phosphate H by Decomposing Phosphate Rock with Sulfuric Acid 3 PO 4 , MAP, MCP, DAP, DCP, etc., will produce waste phosphogypsum. The main component of well-known phosphogypsum is more than 90% CaSO 4 .2H 2 O After proper treatment, cement additives can be produced. The method is to carry out purification treatment in advance, so that there is basically no water-soluble matter and meet the requirements of cement additives. However, in order to be uniform and easy to operate during use, it is required to make phosphogypsum into 10-30mm balls or particles, and then grind them together with cement clinker to meet the requirements. In the prior art, most of the processed phosphogypsum is calcined (such as a "phosphogypsum cement additive" dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14B09B3/00
Inventor 池济亨林孝均
Owner 林孝均
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