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Novel process for comprehensively utilizing carbide slag solid waste for producing calcium-based fertilizers

A technology of carbide slag and new process, which is applied in the field of comprehensive utilization of calcium carbide slag solid waste to produce calcium-based fertilizers, can solve the problems of few successful cases, lack of mature and reliable process schemes, etc., to reduce carbon dioxide emissions, improve economic benefits and Environmental benefits, the effect of reducing production costs

Inactive Publication Date: 2018-10-23
孟建文 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problem of this utilization method is the lack of mature and reliable process solutions, and there are not many successful cases of practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: A new process for the comprehensive utilization of calcium carbide slag solid waste to produce calcium-based fertilizers, including the following steps:

[0032] A, prepare raw materials: calcium carbide slag, nitric acid (concentration 58%), ammonium nitrate (concentration 50%), raw material can use limestone or calcium carbide slag;

[0033] B. To process raw materials, calcium carbide slag undergoes pretreatment procedures such as chemical materials, conditioning, and filtration, so that it can meet the subsequent reaction requirements;

[0034] C, 50% nitric acid is diluted to 43% by adding water in the nitric acid reaction tank;

[0035] D. The intermediate product obtained in steps B and C is put into the chemical feed tank according to a certain proportion to undergo neutralization reaction through metering, and the mother liquor of calcium nitrate is obtained. After cooling and adjusting the pH to 6.8, the mother liquor is sent to the plate and fra...

Embodiment 2

[0039] Embodiment 2: A new process for producing calcium-based fertilizer by comprehensive utilization of carbide slag solid waste, including the following steps:

[0040] A, prepare raw materials: carbide slag, nitric acid (58% concentration), ammonium nitrate (40% concentration);

[0041] B. To process raw materials, calcium carbide slag undergoes pretreatment procedures such as chemical materials, conditioning, and filtration, so that it can meet the subsequent reaction requirements;

[0042] C, add water to dilute 58% nitric acid to 52% in the nitric acid reaction tank according to demand;

[0043] D. The intermediate products obtained in steps B and C are put into the chemical feed tank according to a certain proportion to undergo neutralization reaction after metering, and the mother liquor of calcium nitrate is obtained. After cooling and adjusting the pH to 6.9, the mother liquor is sent to the plate and frame filter press Pressure filtration, the supernatant is for u...

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PUM

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Abstract

The invention discloses a novel process for comprehensively utilizing carbide slag solid waste for producing calcium-based fertilizers. The novel process is characterized by comprising working procedures of A, preparing raw materials; B, treating the raw materials; C, adding water into the raw materials and diluting the raw materials; D, carrying out neutralization reaction; E, carrying out chemical reaction according to certain proportions and matching; F, manufacturing ultimate calcium ammonium nitrate products; G, manufacturing ultimate calcium nitrate products. Compared with the prior art,the novel process has the advantages that the problem of deficiency of application cases for comprehensively utilizing carbide slag solid waste for producing calcium ammonium nitrate and calcium nitrate in industrial production at present can be solved by the aid of the novel process; the carbide slag industrial solid waste can be recycled, standard requirements of Calcium Ammonium Nitrate (HG / T3790-2005) and Agricultural Calcium Nitrate (HG / T 4580-2013) can be met by calcium ammonium nitrate and calcium nitrate which are produced by the aid of the novel process, the production cost of enterprises can be lowered, carbon dioxide emission can be reduced, and accordingly the novel process has excellent economic and environmental benefits.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of resources, in particular to a new process for producing calcium-based fertilizers by comprehensive utilization of carbide slag solid waste. Background technique [0002] Carbide slag is a bulk industrial solid waste, which is the waste residue produced after the hydrolysis of calcium carbide in the process of industrial production of polyvinyl chloride, polyvinyl alcohol, acetylene gas and other products. According to calculations, 1 ton of standard calcium carbide produces acetylene gas and generates about 1.5-2t of calcium carbide slag. According to the statistics of the calcium carbide industry, the annual discharge of calcium carbide slag exceeds 15 million tons. The main component of calcium carbide slag is calcium hydroxide, and it also contains a large amount of useless impurities, such as sulfide, phosphide, iron oxide, magnesium oxide, silicon dioxide, aluminum oxide, etc., as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C13/00C05C5/04C01F11/38
CPCC01F11/38C05C1/00C05C5/04
Inventor 孟建文王浩
Owner 孟建文